JP2000356246A - Vibration control device, case loaded type device and image processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To electrically connect a support body and a supported body and obtain transmission loss of electromagnetic wave between the support body and supported body without impairing a vibration control function for suppressing the transmission of vibration being interposed between the support body and supported body. SOLUTION: An elastically deformable part 56 of a rubber vibration isolator 52 is formed of a central elastic body 62 and an outer peripheral elastic body 64. The central elastic body 62 is formed of conductive rubber and electrically connects a bottom plate part 48 and a top plate part 50. The outer peripheral elastic body 64 is formed of elastic material with an insulating property with granular ferrite sintered bodies mixed in vulcanized rubber so as to be uniformly dispersed, and generates a loss to electromagnetic wave permeated through the central elastic body 62.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device which is interposed between a support and a supported member to suppress transmission of vibration from one of the support and the supported member to the other.

The present invention also relates to a housing-mounted apparatus such as a copying machine or a facsimile machine having first and second housings and an anti-vibration device for suppressing transmission of vibration between the housings. is there.

[0003] The present invention also relates to an image processing apparatus such as a copying machine or a facsimile apparatus having an image reading device and an image output device, and a vibration isolating device for suppressing vibration transmission between these devices.

[0004]

2. Description of the Related Art Some image processing apparatuses such as copiers and facsimile apparatuses use a plurality of structurally separated apparatuses by connecting them with cables, connectors, and the like, and functionally integrate them into a single apparatus. is there. In such an image processing apparatus,
For example, an image reading device (hereinafter, referred to as IIT) and an image output device (hereinafter, referred to as IOT) are structurally separated from each other.
The IIT is used by being placed on the OT. In such an image processing apparatus, for example, in order to suppress transmission of vibration from the image reading apparatus to the image output apparatus, see, for example,
As shown in Japanese Patent Application Laid-Open Publication No. 1 and JP-A-1-194463, a block-shaped vibration-proof rubber is disposed between the IIT and the IOT. The anti-vibration rubber is elastically deformed in the vertical direction by repeatedly receiving a load when vibration is generated from the IIT. Thereby, the vibration is attenuated by the internal resistance of the vibration isolating rubber, and the transmission of the vibration from the IIT to the IOT is suppressed,
The image quality of the recorded image due to the IOT is prevented from being deteriorated due to the influence of the vibration.

Further, in an image processing apparatus in which the IIT and the IOT are structurally separated, an electrical gap and an impedance mismatch occur between the IIT and the IOT.
If the metal shield part of T and the metal shield part of IOT are electrically connected, and one of the shield parts is not grounded, the radiated electromagnetic wave leaks to the outside of the device, and other electronic devices Problems such as malfunction or malfunction of the image processing apparatus due to radiated electromagnetic waves from other electronic devices occur. An example of a shield member for solving such a problem is disclosed in JP-A-10-173381. The shield member disclosed in this publication is formed of an elongated metal plate having a projection formed on the surface and a thick central portion, and is inserted into a gap between a housing opening and a cover for closing the opening. However, if a similar shield member is disposed between the IIT and the IOT, the IIT
And the IOT can be electrically connected to eliminate an electrical gap and impedance mismatch.

Japanese Patent Application Laid-Open No. Hei 5-21583 discloses an anti-vibration support device in which conductive silicone rubber is interposed between a pair of metal supports. According to this anti-vibration support device, the devices supported by the pair of metal supports can be electrically connected to each other by the metal support plate and the conductive silicone rubber. No conduction loss for electromagnetic waves can be obtained, and electromagnetic waves in a wide frequency band cannot be efficiently conducted. For this reason,
When an electromagnetic wave having a high intensity and a wide frequency band is generated from a device supported by a metal support, a problem may occur that the electromagnetic wave radiated to the outside cannot be sufficiently reduced.

FIG. 21 shows an example of a structure for electrically connecting an IIT shield part and an IOT shield part in a copying machine. In the copying machine 200, as shown in FIG. 21A, an anti-vibration rubber 206 is disposed on a bottom plate of an IIT 202 mounted on an IOT 204, and an IIT 20 formed by the anti-vibration rubber 206 is provided.
2 between the IOT 204 and the electric gasket 208
Is arranged. Here, IIT202 and IOT2
04 has a housing 210 and a housing 212 as a unit outer shell, respectively. The housing 210 and the housing 212 cover electric components housed in the housings 210 and 212, respectively. Is provided with a metal shield part (not shown). Also, the electric gasket 208
As shown in FIG. 21B, the shield portion is made of a thin metal material having elasticity, and the respective shield portions are in contact with the exposed bottom plate portion of the housing 210 and the top plate portion of the housing 212 to electrically connect between the shield portions. Connected. Thereby, the housing 21
Electromagnetic waves generated in the casings 0, 212 are shielded by a shield part to prevent leakage to the outside, and electromagnetic waves from the outside of the apparatus are also shielded by the shield parts, so that the casings 210, 212
Intrusion into the inside is prevented. At this time, the electromagnetic wave generated in the IIT 202 escapes to the ground through the shield part of the housing 210, the electric gasket 208, and the housing 210.

[0008]

However, FIG.
In the copying machine 200 shown in FIG.
It is necessary to interpose an anti-vibration rubber 206 for suppressing the transmission of vibration and an electric gasket 208 for electrically connecting the housing 210 and the housing 212 to each other. For this reason, the IIT 202 is placed on the IOT 204 and the copier 2
When used as 00, there is a problem that it is difficult to suppress the cost because the rubber rubber 206 and the electric gasket 208 are required.

Also, as in a copying machine 200 shown in FIG.
2 simply does not provide conduction loss of the electromagnetic waves conducted from the IIT 202 to the IOT 204, and when the frequency range of the electromagnetic waves is wide, the electromagnetic waves are only efficiently used in some bands. Cannot conduct well. Therefore, if the level of the electromagnetic wave from the IIT 202 is high, the IIT 202 to IIT 202
It becomes necessary to provide a filter or the like that absorbs electromagnetic waves between the OTs 204, which increases the cost of the apparatus.

SUMMARY OF THE INVENTION In view of the above facts, an object of the present invention is to provide an anti-vibration function interposed between a support and a supported body to suppress vibration transmission and to electrically connect the support and the supported body. An object of the present invention is to provide an anti-vibration device having an electrical connection function and capable of obtaining a high conduction efficiency with respect to conduction loss of electromagnetic waves or electromagnetic waves in a wide frequency band between a support and a supported body. .

An object of the present invention is to provide a first housing and a second housing.
By using a vibration isolator that suppresses vibration transmission between the casings, the electromagnetic shielding shields provided in the casings are electrically connected, and the conduction loss of electromagnetic waves between the casings is obtained. It is an object of the present invention to provide a housing-mounted type device capable of carrying out the above.

Another object of the present invention is to electrically connect electromagnetic wave shielding shields provided in an image reading apparatus and an image output apparatus by using a vibration isolator for suppressing the transmission of vibration between the image reading apparatus and the image output apparatus. Another object of the present invention is to provide an image processing apparatus capable of obtaining a conduction loss of an electromagnetic wave between apparatuses.

[0013]

According to a first aspect of the present invention, there is provided an anti-vibration device interposed between a support and a supported body to suppress transmission of vibration from one of the support and the supported body to the other. A vibration isolator that is formed of a conductive elastic material, and is elastically deformed by a load from the support or the supported body, and electrically connects the support and the supported body. It has a conductive vibration absorbing part and an electromagnetic wave absorbing part that covers the outer peripheral surface of the vibration absorbing part and absorbs electromagnetic waves.

According to the vibration damping device of the first aspect, when vibration is generated in the support or the supported member, the conductive vibration absorbing portion is elastically deformed by a periodic load change caused by the vibration, and the conductive vibration absorbing portion is deformed. Vibration energy is absorbed by internal resistance or the like, and the vibration is attenuated. As a result, the transmission of vibration from one of the support and the supported member to the other is suppressed by the conductive vibration absorbing portion of the vibration isolator interposed between the support and the supported member.

Further, since the conductive vibration absorbing portion has conductivity, if the conductive vibration absorbing portion is brought into contact with the supporting member and the supported member, the vibration isolating device can be used without using other members such as an electric gasket. Since the support and the supported body can be electrically connected only by the electromagnetic wave generated by the support or the supported body, the electromagnetic wave is transmitted between the support and the supported body through the conductive vibration absorbing portion of the vibration isolator. Conduction between them.

Here, as a material of the conductive vibration absorbing portion, for example, a conductive rubber can be used. Specific examples of such a conductive rubber include conductive materials such as carbon black, acetylene black, and carbon fibers in rubber materials such as acrylonitrile butadiene rubber (NBR), natural rubber (NR), and chloroprene rubber (CR). And the like. Since such a conductive rubber has a large internal resistance, if it is used as a material of the conductive vibration absorbing portion, the energy of the vibration input to the vibration isolator can be efficiently absorbed.

Further, as the material of the electromagnetic wave absorbing portion, for example, various materials such as ferrite sintered body which is a ferrimagnetic material, and rubber and resin containing the ferrite sintered body can be used. According to such an electromagnetic wave absorbing portion, conduction loss can be generated in an electromagnetic wave (high frequency) transmitted from one of the support and the supported member to the other through the conductive vibration absorbing portion.

Here, the sintered ferrite is MO · F
This is a type of ceramic having ferrimagnetism obtained by pressing an oxide fine powder represented by the chemical formula of e ₂ O ₃ into a desired shape and then sintering it at a high temperature of 1000 ° C. or higher. M in the above chemical formula is a divalent metal, for example, Mn (manganese), Zn (zinc), Ni (nickel), or the like.
When the electromagnetic wave absorbing portion is formed of a material containing a sintered ferrite, the sintered ferrite is pulverized into particles or powder, and the sintered ferrite is made of a material such as rubber which serves as a base material of the electromagnetic wave absorbing portion. Mix.

According to a fourth aspect of the present invention, there is provided an anti-vibration apparatus interposed between a support and a supported body to suppress transmission of vibration from one of the support and the supported body to the other. hand,
It is made of an elastic material having conductivity, and is elastically deformed by a load from the support or the supported body, and further includes a conductive vibration absorbing unit that electrically connects the support and the supported body, The conductive vibration absorbing portion is configured by integrally combining two or more divided pieces made of an elastic material having different volume specific resistances.

According to the vibration damping device of the fourth aspect, when vibration occurs in the supporting member or the supported member, the conductive vibration absorbing portion is elastically deformed by a periodic load change caused by the vibration, and the conductive vibration absorbing portion is deformed. Vibration energy is absorbed by internal resistance or the like, and the vibration is attenuated. As a result, the transmission of vibration from one of the support and the supported member to the other is suppressed by the conductive vibration absorbing portion of the vibration isolator interposed between the support and the supported member.

Further, since the conductive vibration absorbing portion has conductivity, if the conductive vibration absorbing portion is brought into contact with the supporting member and the supported member, the vibration isolating device can be used without using another member such as an electric gasket. Only by this, the support and the supported body can be electrically connected. At this time, since the conductive vibration absorbing portion is formed by integrally combining two or more divided pieces each made of an elastic material having a different volume resistivity, the frequency band of the electromagnetic wave that can be conducted by each divided piece is provided. Can be shifted in accordance with the difference in the volume specific resistance, so that the frequency band of the electromagnetic waves that can be conducted can be expanded as compared with the case where the conductive vibration absorbing portion is integrally formed of an elastic material having a constant volume specific resistance.

Here, as a material of the conductive vibration absorbing portion, for example, a conductive rubber can be used. Specific examples of such a conductive rubber include conductive materials such as carbon black, acetylene black, and carbon fibers in rubber materials such as acrylonitrile butadiene rubber (NBR), natural rubber (NR), and chloroprene rubber (CR). For example, by changing the rate of addition of a conductive filler such as carbon black to these rubber materials, the volume resistivity can be adjusted.

According to a sixth aspect of the present invention, there is provided an anti-vibration apparatus interposed between a support and a supported body to suppress transmission of vibration from one of the support and the supported body to the other. hand,
It is made of an elastic material having conductivity and an electromagnetic wave absorbing material mixed in the elastic material, and is elastically deformed by a load from the support or the supported member, and electrically connects the support and the supported member. Having a conductive vibration-absorbing portion that is connected to the

According to the vibration damping device of the sixth aspect, the conductive vibration absorbing portion is made of an elastic material having conductivity and an electromagnetic wave absorbing material mixed in the elastic material, so that the supporting member or the supported member can be used. When the vibration is generated, the conductive vibration absorbing portion is elastically deformed by a periodic load change caused by the vibration, and the vibration energy is absorbed by the internal resistance of the conductive vibration absorbing portion and the vibration is attenuated. As a result, the transmission of vibration from one of the support and the supported member to the other is suppressed by the conductive vibration absorbing portion of the vibration isolator interposed between the support and the supported member.

Further, since the conductive vibration-absorbing portion has conductivity, if the conductive vibration-absorbing portion is brought into contact with the support and the supported body, the vibration isolator can be used without using other members such as an electric gasket. Since the support and the supported body can be electrically connected only by the electromagnetic wave generated by the support or the supported body, the electromagnetic wave is transmitted between the support and the supported body through the conductive vibration absorbing portion of the vibration isolator. Conduction between them. At this time,
By the ferrite sintered body mixed with the conductive vibration absorbing portion, conduction loss can be generated in an electromagnetic wave (high frequency) transmitted from one of the support and the supported member to the other through the conductive vibration absorbing portion.

According to an eighth aspect of the present invention, there is provided a housing-mounted type device, wherein the first housing accommodates electric components, and the first housing is provided so as to cover the accommodated electric components. A first shield portion, a second housing that houses electrical components and is stacked on the first housing, and is provided in the second housing so as to cover the stored electrical components. A second shield portion made of a conductive material, interposed between the first housing and the second housing, and elastically moved by a load from the first housing or the second housing. And a vibration isolator that deforms, wherein the vibration isolator according to claim 1, 2, 3, 4, 5, 6, or 7 is used as the vibration isolator, and the first shield part is formed by the conductive vibration absorbing part. And the second shield part are electrically connected.

[0027] According to the housing mounting type device according to the eighth aspect,
When vibration occurs in the first housing or the second housing, the conductive vibration absorbing portion of the vibration isolator elastically deforms due to a periodic load change caused by the vibration, and the vibration is generated due to the internal resistance of the conductive vibration absorbing portion. Energy is absorbed and vibration is damped. As a result, the transmission of vibration from one of the first housing and the second housing to the other is suppressed by the vibration isolator interposed between the first housing and the second housing.

Further, since the conductive vibration absorbing portion of the vibration isolator has conductivity, the conductive vibration absorbing portion is provided on the first shield portion provided on the first housing and on the second housing. When the first shield part and the second shield part are brought into contact with the second shield part, respectively, the first shield part and the second shield part can be electrically connected only by the vibration isolator without using other members such as an electric gasket. When an electromagnetic wave is generated in the first housing or the second housing, the electromagnetic wave shielded by the first shield portion or the second shield portion passes through the first vibration absorber through the conductive vibration absorber of the vibration isolator. Electrical conduction is provided between the housing and the second housing.

Here, for example, the vibration damping device according to claim 1
According to a sixth aspect of the present invention, in the case of using the configuration according to the sixth aspect, a conduction loss can be generated in an electromagnetic wave (high frequency) transmitted from one of the supporting member and the supported member to the other through the conductive vibration absorbing portion, and the vibration damping device. When the configuration is used, the frequency band of the electromagnetic wave (high frequency) transmitted from one of the support and the supported body to the other through the conductive vibration absorbing portion can be expanded.

According to a ninth aspect of the present invention, there is provided an image processing apparatus for storing an electric component and optically reading a document image, and provided in the image reading device so as to cover the stored electric component. A first shield portion made of a material;
An image output device that stores an electric component and records an image on a recording medium based on an image reading signal from the image reading device; and a conductive material that is provided in the image output device so as to cover the stored electric component. A second shield portion comprising:
A vibration damping device interposed between the image reading device and the image output device, one of which is stacked on the other, and elastically deformed by a load from the image reading device or the image output device; Claims 1, 2, 3, 4, 5, 6 as a vibration device
Alternatively, the first shield part and the second shield part are electrically connected by the conductive vibration absorbing part using the vibration isolator according to claim 7.

According to the image processing apparatus of the ninth aspect, when vibration occurs in the image reading device or the image output device, the conductive vibration absorbing portion of the vibration isolator is elastically deformed due to a periodic load change caused by the vibration, Vibration energy is absorbed by the internal resistance of the conductive vibration absorbing portion and the like, and the vibration is attenuated. As a result, the transmission of vibration from one of the image reading device and the image output device to the other is suppressed by the vibration isolator interposed between the image reading device and the image output device.

Further, since the conductive vibration absorbing portion of the vibration isolator has conductivity, the conductive vibration absorbing portion is provided with a first shield provided in the image reading device and a second shield provided in the image output device. If the first shield part and the second shield part can be electrically connected only by the vibration isolator without using another member such as an electric gasket, if the first shield part and the second shield part are brought into contact with each other, the first shield part can be electrically connected. When an electromagnetic wave is generated in the housing or the second housing, the electromagnetic wave shielded by the first shield unit or the second shield unit passes through the conductive vibration absorbing unit of the vibration isolator to read the image reading device and the image output device. Is conducted between

Here, for example, claim 1 is used as a vibration isolator.
According to another aspect of the present invention, a conduction loss can be generated in an electromagnetic wave (high frequency) transmitted from one of the image reading device and the image output device to the other through the conductive vibration absorbing portion, and the vibration damping device is used. When using the configuration described,
The frequency band of the electromagnetic wave (high frequency) transmitted from one of the first shield part and the second shield part to the other through the conductive vibration absorbing part can be expanded.

[0034]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) FIGS. 2 and 4 show a copying machine 10 according to a first embodiment of the present invention. The copying machine 10 has an image reading device (IIT) 12 and an image output device (IOT) 14 as device constituent units.
It has.

As shown in FIG. 4, the IIT 12 has a substantially rectangular parallelepiped casing 16 as an outer shell of the apparatus. A platen glass 18 is fitted into the top plate of the housing 16, and a document cover 20 is placed on the platen glass 18.
Is provided so as to be openable and closable.

As shown in FIG. 4, a first carriage 22 and a second carriage 24 which are movable in the sub-scanning direction along the lower surface of the platen glass 18 are provided inside the housing 16, and Image reading unit 26 on bottom plate
Is installed. A lamp 28 and a first mirror 30, which are light sources for illuminating a document, are mounted on the first carriage 22, and a second mirror 32 and a third mirror 34 are mounted on the second carriage 24. The image reading section 26 is provided with an imaging lens 36 and a reading sensor 38.

In the IIT 12, after the original is placed on the platen glass 18 during image reading, the carriage 2
2 and 24 respectively move in the sub-scanning direction, and the lamp 28 illuminates the original on the platen glass 18 with illumination light. The reflected light from the original is transmitted to first to third mirrors 3.
The light enters the imaging lens 36 via 0, 32, and 34, and is imaged on the reading sensor 38 by the imaging lens 36. As a result, the reading sensor 38 reads the image carried by the reflected light from the document and outputs an image reading signal to the IOT 14.

As shown in FIG. 4, the IOT 14 has a substantially rectangular parallelepiped casing 40 as an outer shell of the apparatus. An image recording unit (not shown) for recording an image corresponding to an image reading signal on recording paper based on a known electrophotographic process is provided in the housing 40. As shown in FIG. 2, a plurality of paper feed cassettes 4
2 are detachably mounted. Recording papers are stored in these paper cassettes 42, respectively.
The recording paper in the paper supply cassette 42 is supplied to the image recording unit by a paper supply transport mechanism (not shown) in conjunction with the recording operation by the image recording unit.

In the copying machine 10, as shown in FIG.
A shield frame 4 for shielding electromagnetic waves in the housing 16 of the IT 12 and the housing 40 of the IOT 14 and supporting various components housed in the housings 16 and 40, respectively.
4, 46 are provided. The shield frame portion 44 of the IIT 12 is formed of a conductive metal plate, and covers electrical components (including electronic components) such as the reading sensor 38 housed in the housing 16. Here, a part of the shield frame portion 44 constitutes a bottom plate portion 48 of the housing 16, and the bottom plate portion 48 is exposed to the outside.

The shield frame 46 of the IOT 14
Is formed of a conductive metal plate, and covers electrical components (including electronic components) such as a laser diode and a laser drive circuit (not shown) housed in the housing 40, and a frame made of a cable and the like. It is grounded via the ground 47. Here, a part of the shield frame 46 constitutes a top plate 50 of the housing 40 as shown in FIG. 4, and the top plate 50 is exposed to the outside.

The shield frame portions 44 and 46 do not necessarily need to be entirely formed of a metal plate, and a part of the shield frame portions 44 and 46 is formed on the inner surfaces of the housings 16 and 40 by vapor deposition, plating, or the like. Metal film or housing 16,
It is also possible to use a conductive paint applied on the inner surface side of the resin frame 40. The intermediate layer of a resin substrate (not shown) on which electric components are mounted is a metal layer such as aluminum, and this is used as the shield frame portion 44. , 46 may be included.

The copying machine 10 of this embodiment is used with the IIT 12 mounted on the IOT 14 as shown in FIG. As shown in FIG. 3, the bottom plate portion 48 of the IIT 12 is provided with anti-vibration rubbers 52 near each corner portion.
The IT 12 is mounted on the top plate 50 of the IOT 14.

FIG. 1 shows an example of an anti-vibration rubber 52 used in the copying machine 10 of the present embodiment. The anti-vibration rubber 52 has a substantially cylindrical outer shape, and a fitting portion 54 is provided at the top of the rubber component 52 so as to be fitted into a fitting hole 48 </ b> A provided in the bottom plate portion 48. A groove 54A is formed on the outer peripheral surface of the insertion portion 54 along the circumferential direction. Anti-vibration rubber 5
2, the fitting portion 54 is press-fitted into the fitting hole 48A and the peripheral edge of the fitting hole 48A is fitted into the groove 54A over the entire circumference. Thereby, the vibration isolating rubber 52 is fixed to the bottom plate portion 48 of the IIT 12.

The vibration-proof rubber 52 has an elastically deformable portion 56 which is tapered downward in the lower part of the fitting portion 54 and which is tapered downward. The elastically deformable portion 56 projects downward from the bottom plate portion 48. It constitutes a leg part. A circular positioning hole 58 is formed on the lower surface of the elastic deformation portion 56 along the axis S of the vibration isolating rubber 52.

On the other hand, positioning pins 60 projecting upward from the respective corners are fixed to the top plate 50 of the IOT 14. These four positioning pins 60 are inserted into the positioning pins 60 of the
12 is positioned in the horizontal direction along the installation surface G (see FIG. 4) of the apparatus. At this time, the vibration isolating rubber 52 presses the lower surface of the elastically deformable portion 56 against the top plate 50 of the IOT 14. Also, the elastic deformation portion 56 shown in FIG.
The free length H ₁ in the height direction along the axis S of FIG.
The bottom plate 48 of the IIT 12 and the IOT 14 shown in FIG.
A predetermined dimension is longer than a designed clearance C with the top plate portion 50 of FIG.

As shown in FIG. 1, the elastically deformable portion 56 of the vibration isolating rubber 52 is arranged at a central portion in the radial direction, and is arranged so as to cover the entire outer peripheral surface of the central elastic body 62. The outer peripheral elastic body 64 is formed. Further, in the vibration-proof rubber 52, the center elastic body 62 and the insertion portion 5
4 are integrally formed of the same material.

The center elastic body 62 has a columnar shape centered on the axis S of the vibration isolating rubber 52 and is made of conductive rubber which is a vulcanized rubber having conductivity. Examples of the conductive rubber include carbon black (CC, C) in rubber materials such as acrylonitrile butadiene rubber (NBR), natural rubber (NR), and chloroprene rubber (CR).
F), acetylene black, a conductive filler such as carbon fiber, and the like, and having a volume resistivity of less than 10 Ωcm.

The outer peripheral elastic body 64 has a cylindrical shape centered on the axis S, and its thickness is gradually reduced downward so that the outer peripheral surface is tapered. The outer peripheral elastic body 64 is made of an insulating elastic material in which granular ferrite sintered bodies are mixed and uniformly dispersed in vulcanized rubber. As this elastic material, for example, acrylic nitrile butadiene rubber (NB)
R), natural rubber (NR), chloroprene rubber (CR), or other rubber material mixed with a ferrite sintered body pulverized to have a predetermined particle size distribution is used.

Here, the sintered ferrite is MO.Fe ₂
Although represented by the chemical formula of O ₃ , in the present embodiment, M which is a divalent metal element is arbitrarily selected from any one of Mn (manganese), Zn (zinc), and Ni (nickel) or A ferrite sintered body substituted by two or more metals is used as a raw material. The mixing ratio of such a ferrite sintered body to the rubber material is preferably as high as possible as long as the property (rubber elasticity) as an elastic material is not impaired.

In the vibration isolating rubber 52, the inner peripheral surface of the outer peripheral elastic body 64 is in close contact with the outer peripheral surface of the central elastic body 62 as shown in FIG. As a method of manufacturing the vibration-proof rubber 52, for example, after molding the center elastic body 62 and the insertion portion 54 with conductive rubber, the center elastic body 62 is used as a mold core and a ferrite sintered body is mixed with rubber. The outer peripheral elastic body 64 is molded and the central elastic body 6 is molded.
2 and the insertion portion 54 and the outer peripheral elastic body 64 are molded in separate steps, and then the center elastic body 62 is
4, and can be manufactured by press-fitting.

As shown in FIG. 4, the IIT 12 has the IOT
When mounted on the elastic member 14, the vibration-proof rubber 52 receives a compressive load corresponding to the gravity of the IIT 12, and the elastically deformable portion 56 is compressed in the axial direction. At this time, the elastic deformation portion 5 in the axial direction
6 is compressed by the difference equal to the length of the clearance C between the free length H ₁ and device 12, 14 by the compression load from IIT12 as shown in FIG. 1 (A), shown in FIG. 1 (B) As a result, the length in the axial direction is H ₂ equal to the clearance C. At this time, the anti-vibration rubber 52 holds the upper and lower surfaces of the elastically deforming portion 56 with the bottom plate portion 48 and the top plate portion 50, respectively.
To the positioning pin 6 in the horizontal direction.
Constrained by 0.

As shown in FIG. 1B, the outer periphery of the upper surface of the fitting portion 54 and the center elastic body 62 is pressed against the bottom plate portion 48 which is a part of the shield frame portion 44, as shown in FIG. Positioning hole 58 on the lower surface of central elastic body 62
Is pressed against the top plate portion 50 which is a part of the shield frame portion 46. As a result, the shield frame 44 of the IIT 12 is
4 is electrically connected to the shield frame part 46. In other words, the central elastic body 62 of the vibration-proof rubber 52 functions as a vibration absorber that suppresses vibration transmission and also functions as a central conductor that electrically connects the shield frame portions 44 and 46.

Further, as shown in FIG. 1 (B), the vibration isolating rubber 52 presses the upper end surface of the outer peripheral elastic body 64 against the bottom plate 48 of the IIT 12 and presses the lower end surface of the outer peripheral elastic body 64 into the IOT.
14 is pressed against the top plate 50. As a result, the entire outer peripheral surface of the center elastic body 62 is covered with the outer peripheral elastic body 64 and the upper and lower surfaces are covered with the bottom plate portion 48 and the top plate portion 50, respectively. Therefore, the center elastic body 62 is not exposed outside the device between the bottom plate portion 48 and the top plate portion 50.

The outer peripheral elastic body 64 functions together with the central elastic body 62 as a vibration absorber that suppresses vibration transmission. Therefore,
The combined spring constant (static spring constant) of the center elastic body 62 and the outer peripheral elastic body 64 is set according to the weight of the IIT 12, the vibration frequency and the amplitude. Further, since the outer peripheral elastic body 64 includes the ferrite sintered body which is a ferrimagnetic substance as described above, when the central elastic body 62 conducts an electromagnetic wave (high frequency noise), the electromagnetic wave is attenuated. It also functions as a kind of electromagnetic wave filter that causes conduction loss in electromagnetic waves.

Next, the copying machine 10 according to the first embodiment
The operation of will be described.

In the copying machine 10 of the present embodiment, the IIT 1
When reading the image of the original on the platen glass 18 by the second carriage 2, the first carriage 22 and the second carriage 24 are respectively moved in the sub-scanning direction by a driving force from a driving mechanism (not shown) including a stepping motor or the like. As a result, vibrations are generated from the carriages 22 and 24 and their driving mechanisms during image reading, and the vibrations are transmitted to the shield frame unit 44.

When reading the image of the original by the IIT 12, the reading sensor 38 reads the image in synchronization with an oscillation signal (high-frequency signal) oscillated by an oscillator (not shown) to correspond to the image on the main scanning line. Image reading signal
Output to OT14. At this time, an oscillator (not shown),
Strong electromagnetic waves are radiated from the reading sensor 38, a driving circuit (not shown) of the reading sensor 38, a signal line for transmitting an oscillation signal and an image reading signal, and the like. The electromagnetic waves generated from these are shielded by the shield frame 44 and
Leakage to the outside is prevented.

On the other hand, when an image reading signal from the IIT 12 is input, the IOT 14 drives a laser diode (not shown) by a driving signal modulated by the image reading signal, and the IOT 14 is exposed by a laser beam emitted from the laser diode. An electrostatic latent image is formed on a photoconductor by scanning over a body (not shown). The electrostatic latent image on the photoreceptor is transferred onto recording paper through a known process such as toner development and transfer. This recording paper is IOT1 after the toner image is heat-fixed.
4 is discharged to the outside. At the time of this image recording, vibration is generated from the photoconductor and a drive mechanism for driving the photoconductor, and the vibration is transmitted to the shield frame portion 46.

When an image is recorded on recording paper by the IOT 14 as described above, a strong electromagnetic wave is radiated from a laser diode drive circuit, a signal line (not shown) for transmitting a drive signal to the laser diode, and the like. . Electromagnetic waves generated from these components are shielded by the shield frame 46 to prevent leakage to the outside of the housing 40.

In the copying machine 10 of the present embodiment, the IIT 1
The bottom plate portion 48 of the IOT 2 is a part of the shield frame portion 44, and the top plate portion 50 of the IOT 14 is a part of the shield frame portion 46. Also, the bottom plate 48
The elastically deformable portion 5 of the vibration isolating rubber 52 is provided between the
6 are arranged so as to be elastically deformable along the height direction. Here, in the copying machine 10, when the vibration is generated by the IIT 12, the vibration is transmitted from the shield frame 44 to the vibration-proof rubber 52. Thereby, II
Since the elastically deformable portion 56 is elastically compressed and deformed in the height direction by a periodic load change generated by the vibration transmitted from the shield frame portion 44 of T12, the vibration energy is absorbed by the internal resistance of the elastically deformable portion 56. Vibration is damped. As a result, the vibration transmitted from the IIT 12 to the IOT 14 can be made sufficiently small, so that it is possible to prevent the image quality of the recorded image by the IOT 14 from deteriorating due to the influence of the vibration from the IIT 12.

In the copying machine 10 of the present embodiment, the central elastic body 62 of the vibration isolating rubber 52 is formed of conductive rubber, and the central elastic body 62 is formed of the shield frame 44 in the IIT 12 and the shield frame 44 in the IIT 12. , Respectively, the shield frames 44 and 46 of the IIT 12 and the IOT 14 can be electrically connected only by the vibration isolating rubber 52 without using another electrical connection member such as an electric gasket. At this time, since the shield frame portion 44 of the IOT 14 is grounded via the frame ground 47,
The electromagnetic waves generated in the inside and shielded by the shield frame portion 44 pass through the central elastic body 62 of the vibration isolating rubber 52 to the IIT.
It is electrically connected to the twelve shield frame portions 46. As a result, the electromagnetic wave generated by the IIT 12 can escape to the ground through the shield frame 46 and the frame ground 47. Further, static electricity and leakage current of the IIT 12 are also reduced by the anti-vibration rubber 52 and the shield frame portions 44 and 46.
And can escape to the ground side through the frame ground 47, so that the leakage from the IIT 12 and the IIT 1
2 can also be reliably prevented from being charged by static electricity.

In the copying machine 10 of the present embodiment, since the outer elastic body 64 of the vibration isolating rubber 52 is formed of a rubber material including a ferrite sintered body, the outer peripheral elastic body 64 is shielded from the shield frame portion 44 through the central elastic body 62. A conduction loss occurs in the electromagnetic wave transmitted to the frame part 46 due to the ferrite sintered body of the outer peripheral elastic body 64. As a result,
Even if the IIT 12 generates a high-level electromagnetic wave that cannot prevent electromagnetic wave interference simply by electrically connecting the shield frame portions 44 and 46, the electromagnetic wave can be attenuated during conduction from the IIT 12 to the IOT 14.
Without providing a filter or the like that absorbs electromagnetic waves between the IIT 12 and the IOT 14, it is possible to prevent failure due to the influence of the electromagnetic waves from the IIT 12.

The outer peripheral elastic body 64 of the vibration-isolating rubber 52 includes a Ni—Zn-based alloy or a Mn—Zn alloy in addition to the ferrite sintered body in order to increase the efficiency of conduction loss with respect to electromagnetic waves.
The system alloy may be pulverized and mixed.

Further, in the vibration isolating rubber 52 of the present embodiment, a ferrite sintered body is mixed with the outer peripheral elastic body 64 in order to obtain conduction loss with respect to electromagnetic waves. Here, the outer peripheral elastic body 6
No. 4, the ferrite density in the outer elastic body 64 can be increased by mixing a ferrite sintered body obtained by press-forming and sintering a ferrite raw material, so that conduction loss with respect to electromagnetic waves, particularly electromagnetic waves of 30 MHz to 1 GHz can be efficiently reduced. Can be generated. However, the outer peripheral elastic body 64
Even when a non-sintered ferrite raw material (metal oxide) is mixed therein, conduction loss can be generated for electromagnetic waves of 1 GHz or more. Therefore, when it is desired to obtain conduction loss for electromagnetic waves of 1 GHz or more, the outer peripheral elastic body 64 is required. A ferrite raw material may be mixed therein in addition to the ferrite sintered body.

Further, in the vibration isolating rubber 52 of the present embodiment, both the center elastic body 62 and the outer peripheral elastic body 64 are provided so as to be compressed and deformed by the load from the IIT 12.
For example, the height of the outer peripheral elastic body 64 along the axial direction may be shorter than the height of the central elastic body 62, and only the central elastic body 62 may be substantially compressed and deformed by the load from the IIT 12. This allows the center elastic body 62 to function only as a vibration absorber and the outer elastic body 64 to function only as an electromagnetic wave absorber. Therefore, it is not necessary to consider the spring constant of the outer elastic body 62 and the like. The mixing ratio of the sintered ferrite to the elastic body 64 can be greatly increased.

FIG. 5 shows a first modification of the vibration-proof rubber according to the first embodiment of the present invention. The anti-vibration rubber 66 is composed of the anti-vibration rubber 52 shown in FIG.
In contrast to the two-layer structure of the outer elastic body 64, an electromagnetic wave shielding part 68 is further provided on the outer peripheral side of the outer elastic body 64 to form a three-layer structure.

As shown in FIG. 5, the electromagnetic wave shielding portion 68 has a cylindrical shape whose thickness gradually increases from the upper end to the lower end, and is formed of the same material (conductive rubber) as the central elastic body 62. I have. The electromagnetic wave shielding part 68 has a free length in the axial direction shorter than the free length of the elastic deformation part 56 by a predetermined dimension, and is fitted into an axially intermediate portion of the outer peripheral surface of the outer peripheral elastic body 64. As a result, as shown in FIG. 5A, when the elastic deformation portion 56 is not compressed, the upper end and the lower end of the outer peripheral surface of the elastic deformation portion 62 are exposed.

When the IIT 12 is placed on the IOT 14, the elastic deformation portion 56 is compressed in the axial direction by the weight of the IIT 12. At this time, the upper end surface and the lower end surface of the electromagnetic wave shielding portion 68 do not contact the bottom plate portion 48 of the IIT 12 and the top plate portion 50 of the IOT 14, as shown in FIG.
Further, between the electromagnetic wave shielding part 68 and the bottom plate part 48 and between the electromagnetic wave shielding part 68 and the top plate part 50, IIT1
The gaps 69 and 70 are formed so that the electromagnetic wave shielding part 68 does not come into contact with either the bottom plate part 48 or the top plate part 50 even when the elastic deformation part 56 is compressed by the vibration from 2.

As described above, when an electromagnetic wave is transmitted from the shield frame portion 44 of the IIT 12 to the shield frame portion 46 of the IOT 14 through the central elastic body 62, conduction loss occurs due to the ferrite sintered body of the outer peripheral elastic body 64. However, when the level of the electromagnetic wave conducted by the central elastic body 62 is high, the electromagnetic wave attenuated in accordance with the thickness of the peripheral elastic body 64, the mixing ratio of the sintered ferrite, and the like is radiated from the peripheral elastic body 64 to the outside. The radiated electromagnetic waves from the outer peripheral elastic body 64 are covered by the electromagnetic shielding portion 68 having conductivity, since the outer peripheral surface of the outer peripheral elastic body 64 is covered by the electromagnetic wave shielding portion 68.
The light is shielded and reflected by the electromagnetic wave shielding portion 68 having conductivity, and then enters the outer peripheral elastic body 64 again. Thereby, when the level of the electromagnetic wave conducted by the central elastic body 62 is high, the electromagnetic wave radiated from the vibration isolating rubber 66 to the outside of the device can be reduced as compared with the vibration isolating rubber 52, and the outer peripheral elastic body 6
4, a resonance phenomenon of an electromagnetic wave occurs,
The conduction loss with respect to the electromagnetic wave conducted through can be increased. The other functions and effects of the vibration isolating rubber 66 are substantially the same as those of the vibration isolating rubber 52, and thus description thereof is omitted.

In the vibration isolating rubber 66 of the first modification, the electromagnetic wave shielding part 68 and the bottom plate part 48 and the top plate part 50 are insulated from each other in order to provide insulation between the electromagnetic wave shielding part 68 and the shield frame parts 44 and 46. Although the gaps 69 and 70 are provided between the gaps 69 and 70, an insulating material such as rubber is disposed in the gaps 69 and 70, and the insulation properties are maintained over a long period of time without being affected by the set of the elastic deformation portion 56. It may be ensured.

Further, in the vibration isolating rubber 52 of the present embodiment, the electromagnetic wave shielding portion 68 is formed of the same material (conductive rubber) as the central elastic body 62.
8, a conductive thin film material such as a metal tape, an aluminum foil, a copper foil, or a silver foil may be used as the outer elastic body 64.
May be fixedly provided on the outer peripheral surface of the outer peripheral body, or may be provided by applying a conductive paint to the outer peripheral surface of the outer peripheral elastic body 64.

FIG. 6 shows a second modification of the vibration-proof rubber according to the first embodiment of the present invention. The anti-vibration rubber 72 includes a main body 74 having the same outer shape as the anti-vibration rubber 52 shown in FIG. 1, and a cylindrical electromagnetic wave absorber 76 disposed on the outer peripheral side of the main body 74.

As shown in FIG. 6, the main body 74 has a fitting portion 78 fitted into the fitting hole 48A of the bottom plate portion 48 and an elastic deformation portion disposed between the bottom plate portion 48 and the top plate portion 50. 8
0 is provided integrally. The fitting portion 78 and the elastic deformation portion 80 are each formed of the same material (conductive rubber) as the center elastic body 62 of the vibration isolation rubber 52.
Therefore, the elastically deformable portion 80 has a two-layer structure in which the elastically deformable portion 56 shown in FIG. 1 is made of rubber in which conductive rubber and ferrite sintered body are mixed along the radial direction, whereas only the conductive rubber is used. In that it has a single-layer structure.

On the other hand, the electromagnetic wave absorber 76 of the vibration isolating rubber 72 is formed of a sintered ferrite. This ferrite sintered body is the same as the ferrite sintered body mixed with the outer peripheral elastic body 64 in the vibration isolating rubber 52 shown in FIG.

The height H of the electromagnetic wave absorber 76 along the axial direction
₃ is slightly shorter than the clearance C between the bottom plate portion 48 and the top plate portion 50 as shown in FIG. Thus, when the elastic deformation section 80 receives the vibration from the IIT 12, the compression deformation of the elastic deformation section 80 due to the vibration is not limited by the electromagnetic wave absorber 76.

The inner diameter R ₁ of the electromagnetic wave absorber 76 is II
It is substantially equal to the outer diameter L ₁ of the outer peripheral surface upper portion of the elastic deformation portion 80 which receives the weight of the T12. Therefore, the inner peripheral surface of the electromagnetic wave absorber 76 is in contact with the outer peripheral surface of the elastically deformable portion 80 only near the upper end portion which is the maximum outer diameter portion. As a result, the elastic deformation of the elastic deformation portion 80 in the radial direction is not substantially prevented by the electromagnetic wave absorber 76 and the electromagnetic wave absorber 7
6 is positioned so as to be coaxial with the elastic deformation portion 80.

In the vibration-proof rubber 72 of the second modification, the elastically deformable portion 80 made of conductive rubber can be elastically deformed by the load (vibration) from the IIT 12, and the I
Shield frame 44,4 between IT12 and IOT14
6 are electrically connected. As a result, when a vibration is generated by the IIT 12, the vibration causes the elastic deformation portion 80 to generate.
Is elastically deformed in the height direction.
The vibration energy is absorbed by the internal resistance of 0 and the vibration is attenuated.

The electromagnetic wave generated by the IIT 12 is conducted to the IOT 14 through the elastically deforming portion 80 of the vibration isolating rubber 72. At this time, in the vibration isolating rubber 72, the electromagnetic wave absorber 76 formed of a ferrite sintered body is elastically deformed by the elastic deformation portion 80.
The elastic deformation portion 80
A conduction loss occurs in the electromagnetic wave transmitted through the electromagnetic wave absorber 76.

The anti-vibration rubber 72 of the modified example 2 is
When it is arranged between the OT 14 and the OT 14, the electromagnetic wave absorber 76
Since the whole is made of a sintered ferrite, higher electric loss can be obtained with respect to electromagnetic waves as compared with the case where the anti-vibration rubber 52 shown in FIG. 1 is used. Further, since the electromagnetic wave absorber 76 is formed of a high-strength ferrite sintered body, when an excessive load acts on the vibration isolating rubber 72 from the IIT 12, the electromagnetic wave absorber 76 limits the compression deformation of the elastic deformation portion 80. The IIT 12 can be prevented from being excessively displaced by the electromagnetic wave absorber 76. Other anti-vibration rubber 72
Are substantially the same as those of the anti-vibration rubber 52, and therefore description thereof is omitted.

In the anti-vibration rubber 72 of the second modification, an electromagnetic wave shield similar to the anti-vibration rubber 66 of the first modification is provided on the outer peripheral surface of the electromagnetic wave absorber 76.
6 may be prevented from leaking.

FIG. 7 shows a third modification of the vibration damping rubber according to the first embodiment of the present invention. The anti-vibration rubber 82 has the same outer shape as the anti-vibration rubber 52 shown in FIG. 1, and has a fitting portion 84 and a bottom plate portion 48 and a top plate portion 50 that are fitted into fitting holes 48A of the bottom plate portion 48. The elastic deformation portion 86 is provided between the elastic deformation portions 86. The fitting portion 84 and the elastically deforming portion 86 are integrally formed of an elastic material in which a ferrite sintered body on grains is mixed in conductive rubber.

Here, the conductive rubber serving as the base material of the vibration isolating rubber 82 is made of the same material as the center elastic body 62 of the vibration isolating rubber 52, and the ferrite sintered body mixed therewith is:
The same material as that of the sintered ferrite mixed in the outer elastic body 64 of the vibration-proof rubber 52 is used. Therefore, the vibration isolating rubber 82 has elasticity and conductivity, and also has a function as an electromagnetic wave absorber that causes conduction loss to electromagnetic waves.

In the vibration-proof rubber 82 of the third modification, the elastically deformable portion 86 made of conductive rubber mixed with a ferrite sintered body can be elastically deformed by the load (vibration) from the IIT 12. The shield frame portions 44 and 46 of the IIT 12 and the IOT 14 are electrically connected. Thereby, when vibration is generated by the IIT 12,
Since the elastically deformable portion 86 is elastically compressed and deformed in the height direction by this vibration, the vibration energy is absorbed by the internal resistance of the elastically deformable portion 86 and the vibration is attenuated.

The electromagnetic wave generated by the IIT 12 is conducted to the IOT 14 through the vibration isolating rubber 82. At this time, since the ferrite sintered body is mixed in the material forming the vibration isolating rubber 82, conduction loss occurs in the electromagnetic wave transmitted through the vibration isolating rubber 82.

Since the anti-vibration rubber 82 of the third modification is integrally formed of conductive rubber mixed with a ferrite sintered body, the other anti-vibration rubbers 52 and 6 are used as the anti-vibration rubber 82.
6 and 72, the number of parts and the assembling process can be respectively reduced. As a result, it is possible to manufacture the anti-vibration rubber 82 having conductivity and obtaining conduction loss with respect to electromagnetic waves at low cost. Other effects of the vibration isolating rubber 82 are described below.
The description is omitted because it is substantially the same as the vibration-proof rubber 52.

FIG. 8 shows a fourth modification of the vibration-proof rubber according to the first embodiment of the present invention. The anti-vibration rubber 88 has the same outer shape as the anti-vibration rubber 52 shown in FIG. 1, and has a fitting portion 90 to be fitted into the fitting hole 48A of the bottom plate portion 48 and the bottom plate portion 48 and the top plate portion 50. And an elastic deformation portion 92 disposed therebetween. The fitting portion 90 and the elastic deformation portion 92 are integrally formed of the same material (conductive rubber) as the center elastic body 62 of the vibration isolating rubber 52 shown in FIG.

In the vibration-proof rubber 88 of Modification 4, the elastically deformable portion 94 made of conductive rubber can be elastically deformed by the load (vibration) from the IIT 12, and the II
Shield frame parts 44, 46 between T12 and IOT14
Are electrically connected. As a result, when a vibration is generated by the IIT 12, the elastic deformation portion 86 is elastically compressed and deformed in the height direction by the vibration.
Vibration energy is absorbed by the internal resistance of the attenuator and the vibration is attenuated.

The electromagnetic wave generated by the IIT 12 is conducted to the IOT 14 through the vibration isolating rubber 88. As a result, the electromagnetic waves generated in the housing 16 of the IIT 12
Conduction is made to the shield frame part 46 of T14. As a result, the electromagnetic wave generated by the IIT 12 can escape to the ground through the frame ground 47 connected to the shield frame part 46.

FIG. 9 shows a fifth modification of the vibration damping rubber according to the first embodiment of the present invention. The anti-vibration rubber 94 has a two-part structure along the axial direction.
The upper elastic piece 96 connected to and fixed to the bottom plate 48 of the
Lower elastic piece 98 connected and fixed to top plate 50 of OT 14
And The upper elastic piece 96 has a fitting portion 100 and a bottom plate portion 48 that are fitted into the fitting holes 48A of the bottom plate portion 48.
An elastically deformable portion 102 is provided integrally between the top plate 50 and the top plate 50. The elastically deforming portion 102 has a substantially cylindrical shape, and a fitting concave portion 104 having a circular concave shape centered on the axis S is formed on the lower end surface.

When the vibration isolating rubber 94 is used instead of the other vibration isolating rubber 52, the bottom plate 50 of the IOT 12 is used.
Is provided with a fitting insertion hole 50A instead of the positioning pin 60. On the other hand, the lower elastic piece 98 has a fitting portion 106 and a fitting recess 1 fitted into the fitting hole 50A of the top plate portion 50.
A fitting projection 108 that fits into the inside of the fitting 04 and positions the upper elastic piece 96 is provided integrally. In addition, vibration isolating rubber 94
Then, the fitting convex portion 1 in the non-deformed state shown in FIG.
The height H ₄ of 08 depth D ₁ of the fitting recess 104 is longer by more predetermined length.

The upper elastic piece 96 and the lower elastic piece 98 are basically formed of the same material (conductive rubber) as the center elastic body 62 of the vibration isolating rubber 52 shown in FIG. However, the conductive rubber having the upper elastic piece 96 and the conductive rubber having the lower elastic piece 98 have different values in volume resistivity. Setting the volume resistivity of the conductive rubber to a desired value in this manner can be achieved by, for example, changing the rate of addition of a conductive filler such as carbon black to the rubber material.

In the case where the anti-vibration rubber 94 of the modification 5 is used for the copying machine 10, the insertion portion 100 is inserted into the insertion hole 48A in advance before the IIT 12 is mounted on the IOT 14, and the upper elastic member 94 is used. The piece 96 is fixed to the bottom plate portion 48 and the insertion portion 106
Is inserted into the insertion hole 50A, and the lower elastic piece 98 is attached to the top plate 5.
It is fixed to 0. After that, the IIT 12 is placed on the IOT 14 while the fitting projection 108 of the lower elastic piece 98 is fitted into the fitting recess 100 of the upper elastic piece 96. This allows
The IIT 12 and the IOT 14 are arranged at the same position in the horizontal direction. Also, the elastic deformation portion 1 of the upper elastic piece 96
02 is compressed in the axial direction by the weight of the IIT 12, and the fitting protrusion 108 of the lower elastic piece 98 is compressed in the axial direction by the weight from the IIT 12 transmitted through the upper elastic piece 96. . At this time, FIG.
As shown in the figure, the height of the fitting projection 108 is
04 depth.

In the vibration-proof rubber 94 of the fifth modification, the elastically deforming portion 102 of the upper elastic piece 96 and the fitting projection 108 of the lower elastic piece 98 made of conductive rubber are elastically deformed by the load (vibration) from the IIT 12. It is possible to be deformed,
A shield frame portion 44 between the IIT 12 and the IOT 14,
46 are electrically connected. Thereby, IIT1
2, the elastic deformation portion 102 and the fitting protrusion 108 are elastically compressed and deformed in the height direction by the vibration.
The vibration energy is absorbed by the internal resistance 08 and the vibration is attenuated.

Here, the upper elastic piece 96 and the lower elastic piece 98
"" Means that they may be formed of conductive rubbers having the same hardness, or may be formed of conductive rubbers having different hardnesses. For example, when high frequency vibration and low frequency vibration are generated by the IIT 12, the upper elastic piece 96 is formed of a high hardness conductive rubber corresponding to the high frequency vibration, and the lower elastic piece 98 is corresponding to the low frequency vibration. Is formed of a conductive rubber having a low hardness, two kinds of vibrations having different frequency bands can be effectively absorbed by the anti-vibration rubber 94.

The electromagnetic waves generated by the IIT 12 are conducted to the IOT 14 through the vibration isolating rubber 94. As a result, the electromagnetic wave generated in the housing 16 of the IIT 12 passes through the vibration isolating rubber 94 and the shield frame 46 of the IOT 14.
Is conducted. As a result, the electromagnetic wave generated by the IIT 12 can escape to the ground through the frame ground 47 connected to the shield frame part 46.

Here, the upper elastic piece 96 and the lower elastic piece 98
Is formed of conductive rubber having different volume specific resistances. Accordingly, the frequency band of the electromagnetic wave that can be conducted by the upper elastic piece 96 and the frequency band of the electromagnetic wave that can be conducted by the lower elastic piece 98 can be shifted according to the difference in the volume resistivity. Therefore, according to the anti-vibration rubber 94, the frequency band of electromagnetic waves that can be conducted can be expanded as compared with the other anti-vibration rubbers 52 and the like.

FIG. 10 shows a sixth modification of the vibration damping rubber according to the first embodiment of the present invention. This vibration isolating rubber 110 has a three-part structure along the axial direction.
Upper elastic piece 11 connected and fixed to bottom plate 48 of IT 12
2, a lower elastic piece 114 connected and fixed to the top plate 50 of the IOT 14, and an intermediate elastic piece 116 sandwiched between the upper elastic piece 112 and the lower elastic piece 114.

The upper elastic piece 112 is integrally provided with a fitting portion 118 fitted into the fitting hole 48A of the bottom plate portion 48 and an elastic deformation portion 120 disposed between the bottom plate portion 48 and the top plate portion 50. Is provided. The elastically deforming portion 120 has a cylindrical shape with a bottom, and has a fitting concave portion 122 having a circular concave shape centered on the axis S at the lower end surface.

Further, the lower elastic piece 114 is
The lower elastic piece 114 is also integrally provided with a fitting insertion portion 124 and an elastic deformation portion 126 having a fitting recess 128 formed on the lower end surface.

On the other hand, the middle elastic piece 116 is
It is formed in a column shape corresponding to the fitting recess 124 of the twelve and the fitting recess 128 of the lower elastic piece 114.

Here, when the elastic pieces 112, 114 and 116 are not elastically deformed, the depth D
₂ and has become equal to the depth D ₃ of the fitting recess 128, also the height H ₅ in the axial direction of the intermediate elastic piece 116, the depth D ₂
It is given has the length longer than the sum of the bets depth D _3.

The upper elastic piece 112, the intermediate elastic piece 116, and the lower elastic piece 114 are basically formed of the same material (conductive rubber) as the center elastic body 62 of the vibration isolating rubber 52 shown in FIG. . However, each of the elastic pieces 112, 1
14 and 116 are formed of conductive rubber having different volume specific resistances. Setting the volume resistivity of the conductive rubber to a desired value in this manner can be achieved by, for example, changing the rate of addition of a conductive filler such as carbon black to the rubber material.

In the case where the anti-vibration rubber 110 of the modification 6 is used for the copying machine 10, before the IIT 12 is mounted on the IOT 14, the insertion portion 118 is inserted into the insertion hole 48A in advance and the upper elastic portion is inserted. The piece 112 is fixed to the bottom plate 48 and
The lower elastic piece 114 is fixed to the top plate 50 by inserting the fitting 24 into the fitting hole 50A. Thereafter, the IIT 12 is fitted while the upper side of the middle elastic piece 116 is fitted into the fitting recess 122 of the upper elastic piece 112 and the lower side of the middle elastic piece 116 is fitted into the fitting recess 128 of the lower elastic piece 114. Place on IOT14. As a result, the IIT 12 and the IOT 14 are positioned at the same position in the horizontal direction. Also, the elastic deformation portion 120 of the upper elastic piece 112 and the lower elastic piece 114
Of the IIT 12 is compressed in the axial direction by the weight of the IIT 12, and the intermediate elastic piece 116 is compressed in the axial direction by the weight from the IIT 12 transmitted through the upper elastic piece 112. At this time, FIG.
As shown in (B), the height of the intermediate elastic piece 116 is equal to the sum of the depth of the fitting recess 104 and the depth of the fitting recess 128.

In the vibration isolating rubber 94 of the sixth modification, the elastic deformation portion 12 of the upper elastic piece 112 made of conductive rubber is used.
0, the elastic deformation portion 126 of the lower elastic piece 114 and the intermediate elastic piece 116 can be elastically deformed by a load (vibration) from the IIT 12, and an electrical connection is provided between the shield frame portions 44, 46 between the IIT 12 and the IOT 14. Connected to Thereby, when vibration is generated by the IIT 12, the elastic deformation portions 120 and 126 and the intermediate elastic piece 116 are elastically compressed and deformed in the height direction by the vibration, respectively.
Vibration energy is absorbed by the internal resistance 6 and the vibration is attenuated.

Here, the upper elastic piece 112 and the lower elastic piece 1
14 and the intermediate elastic piece 116 may be formed of conductive rubber having the same hardness, or may be formed of conductive rubber having different hardnesses. For example, IIT
In the case where high frequency vibration and low frequency vibration and vibration in an intermediate band between these are generated by 12, the upper elastic piece 112 is formed of high hardness conductive rubber in correspondence with the high frequency vibration,
If the lower elastic piece 114 is formed of low hardness conductive rubber corresponding to low frequency vibration, and the intermediate elastic piece 116 is formed of medium hardness conductive rubber corresponding to middle band vibration, the frequency band becomes Anti-vibration rubber 11 for three different types of vibration
A value of 0 allows for more effective absorption.

The electromagnetic wave generated by the IIT 12 is conducted to the IOT 14 through the vibration isolating rubber 110. As a result, the electromagnetic waves generated in the housing 16 of the IIT 12 are conducted to the shield frame 46 of the IOT 14 through the vibration isolating rubber 110. As a result, the electromagnetic wave generated by the IIT 12 can escape to the ground through the frame ground 47 connected to the shield frame part 46.

Here, the upper elastic piece 112 and the lower elastic piece 1
14 and the intermediate elastic piece 116 are formed of conductive rubber having different volume specific resistances. Thereby, the frequency band of the electromagnetic wave that can be conducted by each of the elastic pieces 112, 114, and 116 can be shifted according to the difference in the volume specific resistance. Therefore, according to the anti-vibration rubber 110, the frequency band of electromagnetic waves that can be conducted can be expanded as compared with the other anti-vibration rubbers 52 and the like.

Next, the anti-vibration rubber 52 according to the present embodiment,
The effect of suppressing electromagnetic waves when 72 is applied to the copying machine 10 will be described.

In FIG. 11, the anti-vibration rubber 52 shown in FIG. 1, the anti-vibration rubber 72 shown in FIG. 6, and the conventional anti-vibration rubber 206 shown in FIG. 21 are arranged between the IIT 12 and the IOT 14, respectively. Noise electric field strength of radiated electromagnetic wave in case of 1
The results measured based on the 0 m method (VCCI regulation) are shown.

The measurement frequencies f1 = 40 MHz, f2 = 60 MHz, and f3 = 70 MH plotted on the horizontal axis in FIG.
z, f4 = 170 MHz, f5 = 190 MHz, f6 =
200 MHz. A solid line connecting diamond symbols indicates a change in electric field strength at each side frequency when the vibration isolating rubber 206 formed of non-conductive rubber is used, and a chain line connecting square symbols indicates the present embodiment. Anti-vibration rubber 7 according to
2 indicates the electric field strength at each side frequency, and the broken line connecting the triangular symbols indicates the electric field strength at each side frequency when the anti-vibration rubber 52 according to the present embodiment is used. I have.

As shown in FIG. 11, when the anti-vibration rubber 72 is used, the electric field intensity of the radiated electromagnetic wave at all the measurement frequencies other than f2 = 60 MHz is smaller than that when the anti-vibration rubber 206 is used. Is declining. Therefore, from FIG.
It is confirmed that the anti-vibration rubber 72 can reduce electromagnetic waves (radiated electromagnetic waves) leaking to the outside of the apparatus.

Further, when the vibration isolating rubber 52 is used, the electric field intensity of the radiated electromagnetic wave is reduced at all the measurement frequencies as compared with the case where the vibration isolating rubber 206 is used. Therefore, FIG.
From No. 1, it is confirmed that the electromagnetic wave is efficiently absorbed by the outer peripheral elastic body 64 formed of the rubber mixed with the ferrite sintered body, whereby the electromagnetic wave (radiated electromagnetic wave) can be effectively reduced.

FIGS. 12, 13 and 14 show the electromagnetic wave insertion loss caused by the vibration isolating rubber 88 shown in FIG. 8, the vibration isolating rubber 52 shown in FIG. 1, and the vibration isolating rubber 66 shown in FIG. 5, respectively. The measurement result of (S21 characteristic) is shown.

Comparing the insertion loss of the anti-vibration rubber 88 shown in FIG. 12 with respect to the electromagnetic wave and the insertion loss of the anti-vibration rubber 52 shown in FIG. 13 with respect to the electromagnetic wave, the outer peripheral elastic body 64 mixed with the ferrite sintered body is provided. Anti-vibration rubber 52
In this case, a large insertion loss occurs in a wide frequency band with respect to the vibration-isolating rubber 88 integrally formed of the conductive rubber. Therefore, it is confirmed that conduction loss occurs with respect to electromagnetic waves conducted through the central elastic body 62 by the outer peripheral elastic body 64 in which the ferrite sintered body is mixed.

Also, when comparing the insertion loss of the anti-vibration rubber 52 shown in FIG. 13 with respect to the electromagnetic wave and the insertion loss of the anti-vibration rubber 66 shown in FIG. However, although insertion loss occurs in substantially the same frequency band as the vibration-proof rubber 52, the insertion loss caused by the vibration-proof rubber 66 is larger than the insertion loss caused by the vibration-proof rubber 52. Therefore, it is confirmed that the electromagnetic wave is reflected and radiated by the electromagnetic wave shielding portion 68 of the vibration isolating rubber 66, and the conduction effect of the electromagnetic wave can be increased by the resonance effect caused by the reflection.

FIGS. 15, 16 and 17 show IIT1
Radiation electromagnetic waves (vertically polarized waves) in the case where the conventional anti-vibration rubber 206 shown in FIG. 21, the anti-vibration rubber 88 shown in FIG. 8, and the anti-vibration rubber 52 shown in FIG. The results obtained by measuring the noise electric field intensity of the wave (wave) by a spectrum analyzer based on the 10 m method (VCCI regulation) are shown. Each figure shows the result of measuring the noise electric field intensity of the radiated electromagnetic wave over a frequency of 30 to 1000 MHz. The limit value of the type 2 information device according to the VCCI regulation is 30 dBμV / 30 to 230 MHz.
m, 37dBμV at 230-1000MHz
/ M, and this limit value is indicated by a solid line in each figure.

When an anti-vibration rubber 206 integrally formed of non-conductive rubber is arranged between the IIT 12 and the IOT 14, as shown in FIG. 15, noise electric fields are generated at a plurality of frequencies in a frequency band of 30 to 230 MHz. Strength is 30
It exceeds the limit value of dBμV / m.

On the other hand, when an anti-vibration rubber 88 made of conductive rubber is disposed between the IIT 12 and the IOT 14, as shown in FIG. 16, the noise electric field strength is 30 dBμV / in the frequency band of 30 to 230 MHz. m and the noise electric field strength does not exceed the limit of 37 dBμV / m even in the frequency band of 230 to 1000 MHz.
However, in the frequency band of 30 to 230 MHz, the noise electric field intensity reaches approximately 30 dBμV / m at a plurality of frequencies. Therefore, comparing the measurement results obtained when the anti-vibration rubber 206 shown in FIG. 15 is used with the measurement results obtained using the anti-vibration rubber 88 shown in FIG. 44 and the shield frame portion 46 of the IOT 14 are electrically connected,
Emit electromagnetic waves generated by IIT12 to ground,
It is confirmed that the electromagnetic wave radiated from the copying machine 10 can be suppressed.

When the anti-vibration rubber 52 made of conductive rubber is arranged between the IIT 12 and the IOT 14, as shown in FIG. 17, the noise electric field strength is 30 dBμV / in the frequency band of 30 to 230 MHz. m, and the noise electric field strength is less than the limit value of 37 dBμV / m even in the frequency band of 230 to 1000 MHz. Therefore, comparing the measurement results obtained when the anti-vibration rubber 88 shown in FIG. 16 is used with the measurement results obtained when the anti-vibration rubber 52 shown in FIG. 17 is used, the center elastic body 62 of the anti-vibration rubber 52 shows Shield frame part 4 of IIT12
4 is electrically connected to the shield frame portion 46 of the IOT 14, and a conduction loss is generated in an electromagnetic wave conducted through the central elastic body 62 by the outer peripheral elastic body 64.
It is confirmed that the radiation electromagnetic wave from the copying machine 10 can be effectively suppressed.

In the description of the first embodiment, the anti-vibration rubbers 52, 66, 72, 82, 88, 94, 1
10 as IIT 12 and IOT in copier 10
14, the IIT and the IOT are integrated as an image forming device 132, and a sheet feeding device 136 having a plurality of sheet feeding cassettes 134 is connected thereto as shown in FIG. Copier 130 also has anti-vibration rubber 5
2, 66, 72, 82, 94, 110 can also be used. In this case, the image forming device 132 and the sheet feeding device 136
Between the anti-vibration rubber 52, 66, 72, 82, 94, 11
0, the image forming device 132 and the sheet feeding device 13
6 are electrically connected, and the frame of the sheet feeding device 136 is grounded. Thereby, the electromagnetic wave generated by the image forming device 132 can be released to the ground.

Further, in the copying machines 10 and 130, it is not necessary to use only one kind of vibration isolating rubber,
It is also possible to use 2 to 4 types of anti-vibration rubbers appropriately selected from 6, 72, 82, 88, 94 and 110.

(Second Embodiment) FIG. 19 shows an engine mount structure 140 using an anti-vibration rubber according to a second embodiment of the present invention. This engine mount structure 140 is applied to a vehicle such as an automobile that runs using an engine as a drive source, and FIG.
A body frame 142 as a support, as shown in FIG.
An engine as a supported body mounted on the body frame 142 is provided. An anti-vibration rubber 146 is arranged between the vehicle body frame 142 and the engine 144. Here, the vehicle body frame 142 is formed of a metal such as iron or aluminum, and the engine 144 is provided with a metal casing 148 as an outer shell.

As shown in FIG. 19B, the vibration isolating rubber 146 is connected to the body frame 1 via two bolt shafts 150.
A casing 148 of the engine 144 via a first connecting plate 156 connected and fixed to the
And a second connecting plate 157 that is connected to and fixed to the base member. A rubber elastic body 154 that mainly absorbs vibration is disposed between the connecting plates 156 and 157. Connecting plate 156,
Reference numerals 157 are made of conductive metal such as iron.

The elastic body 154 is provided with a columnar central elastic portion 158 on the center side, and a thin cylindrical outer peripheral elastic portion 159 is provided concentrically on the outer peripheral side of the central elastic portion 158. The outer peripheral elastic portion 159 is in close contact with the entire outer peripheral surface of the central elastic portion 158. The center elastic portion 158 is formed of the same material as the center elastic body 62 of the vibration isolating rubber 52 shown in FIG. 1, that is, made of conductive rubber, and the peripheral elastic portion 159 is a peripheral elastic body of the vibration isolating rubber 52 shown in FIG. 64 is formed of the same material as that of the rubber mixed with the ferrite sintered body. The anti-vibration rubber 146 electrically connects the casing 148 of the engine 144 and the vehicle body frame 142 by a center elastic portion 158 formed of conductive rubber.

The engine 144 is equipped with a power supply circuit (not shown) including electric components such as a starter motor and a generator. The power supply circuit is provided with a pair of electrode terminals for supplying power from the outside. One electrode terminal is connected to a battery (not shown) grounded to the body frame 142 via a cable or the like, and Are connected to the casing 148 of the engine 144.

Next, the operation of the engine mount structure 140 according to the second embodiment will be described. In the engine mount structure 140, when the engine 144 is operated, vibration of a frequency corresponding to the engine speed, load, and the like is generated, and high-intensity electromagnetic waves are generated by sparks of a spark plug or the like.

The vibration generated by the engine 144 is transmitted to the vibration isolating rubber 146 via the casing 148. As a result, the elastic body 154 of the vibration isolation rubber 146 is elastically deformed in the axial direction due to a periodic load change caused by vibration, so that vibration energy is absorbed by internal resistance of the elastic body 154 and vibration is attenuated. As a result, engine 1
Since the vibration transmitted from the vehicle body 44 to the vehicle body frame 142 can be sufficiently reduced, it is possible to prevent an excessive load from acting on the vehicle body frame 142 due to the vibration from the engine 144 or to prevent the ride comfort of the occupant from being deteriorated due to the vibration.

The electromagnetic waves generated by the engine 144 are shielded by the casing 148, so that leakage to the outside of the engine 144 is prevented. At this time, the casing 148
Is electrically connected to the vehicle body frame 142 by the vibration isolating rubber 146, the electromagnetic wave generated by the engine 144 is conducted to the vehicle body frame 142 through the center elastic portion 158 of the vibration isolating rubber 146 and the engine 144
Of the casing 148 and the body frame 142 are maintained at the same potential. Further, the outer peripheral elastic portion 159 of the vibration isolating rubber 146 is formed of a rubber material including a ferrite sintered body, so that the engine 14 can pass through the central elastic portion 158.
4 causes conduction loss in the electromagnetic waves transmitted to the body frame 142. As a result, problems such as malfunction of a vehicle control circuit (not shown) due to the influence of electromagnetic waves from the engine 144 do not occur, and leakage of electromagnetic waves to the outside of the vehicle is suppressed.

Therefore, according to the engine mount structure 140 of the present embodiment, the engine 144 and the vehicle body frame 142 can be electrically connected without using an electrical connection member such as a high-voltage cable, and a simple electric connection can be achieved. The engine 144 and the body frame 142 are
The electromagnetic wave radiated to the outside of the vehicle can be reduced as compared with the case where the connection is made.

(Third Embodiment) FIG. 20 shows a juicer 160 according to a third embodiment of the present invention. The juicer 160 includes a container 162 and a blade body 164 provided in the container 162 as shown in FIG. The blade body 164 is connected to a motor 166, rotates by a driving force from the motor 166, and crushes a juice material such as a fruit in the container 162. The motor 166 includes a metal casing 168 as an outer shell, and a metal flange plate 170 is fixed to one end of the casing 168 in the axial direction. The flange plate 170 is, for example, a rectangular metal plate. At each corner of the flange plate 170, a connection hole 172 penetrating in the plate thickness direction is formed as shown in FIG. Have been.

As shown in FIG. 20, the juicer 160 has a metal support frame 174 as a support for the container 162 and the motor 166, which are supported, and the support frame 174 is grounded through a power supply socket or the like. It has been. A base 176 is provided at the lower end of the support frame 174, and a plurality of legs 178 projecting upward from the base 176 are integrally provided.

The legs 178 of the support frame 174
As shown in FIG. 0 (B), the outer shape is formed in a substantially truncated cone shape, and the inside is hollow. A cylindrical portion 180 projecting upward along the axis S is provided on the top surface of the leg portion 178, and a screw hole 181 is formed in the cylindrical portion 180.

A cylindrical anti-vibration rubber 182 having a through hole 183 formed along the axis S is fitted on the outer peripheral surface of the cylindrical portion 180. A screw 1 is attached to the tip of the cylindrical portion 180.
A disk-shaped fixing plate 184 is fastened and fixed by 85, and this fixing plate 184 compresses the vibration-proof rubber 182 in the axial direction and prevents the vibration-proof rubber 182 from falling off from the cylindrical portion 180.

A connecting groove 186 extending in the circumferential direction is formed at the center in the axial direction on the outer peripheral surface of the vibration-proof rubber 182.
In the connection groove 186, a peripheral portion of the connection hole 172 in the flange plate 170 is buried. As a result, the flange plate 170 is connected and fixed to the leg portion 178 via the anti-vibration rubber 182.

The vibration-proof rubber 182 is provided with a thick columnar center elastic portion 188 on the inner peripheral side.
An outer peripheral elastic portion 190 having a thin cylindrical shape is provided concentrically on the outer peripheral side of 88. The outer peripheral elastic portion 190 is in close contact with the entire outer peripheral surface of the central elastic portion 188. Center elastic part 188
Is formed of the same material as the central elastic body 62 of the vibration-isolating rubber 52 shown in FIG. 1, that is, made of conductive rubber. That is, the ferrite sintered body is formed of a mixed rubber. The anti-vibration rubber 182 electrically connects the flange plate 170 and the support frame 174 by a center elastic portion 188 formed of conductive rubber. Thus, the casing 168 of the motor 166 is electrically connected to the support frame 174 through the flange plate 170 and the vibration isolating rubber 182.

Next, the juicer 1 according to the third embodiment will be described.
The operation of 60 will be described. In the juicer 160, when the motor 166 operates, vibration is generated from the motor 166, and electromagnetic waves are generated from electric components such as the motor 166 and a motor drive circuit (not shown).

The vibration generated by the motor 166 is transmitted through the casing 168 and the flange plate 170 to the vibration isolating rubber 18.
2 is transmitted. As a result, the anti-vibration rubber 182 is elastically deformed by a periodic load change caused by vibration,
Vibration energy is absorbed by the internal resistance of the rubber forming the vibration isolating rubber 182, and the vibration is attenuated. As a result, the vibration transmitted from the motor 166 to the support frame 174 can be sufficiently reduced, so that high-level noise from the juicer 160 due to the vibration from the motor 166 can be prevented.

The electromagnetic wave generated by the motor 166 is shielded by the casing 168 to prevent leakage to the outside. At this time, the casing 168 is
The electromagnetic wave generated by the motor 166 is transmitted through the center elastic portion 188 of the vibration-proof rubber 182 because the support frame 174 is electrically connected to the support frame 174.
And the casing 168 of the motor 166 and the support frame 174 are maintained at the same potential (ground potential). Further, since the outer peripheral elastic portion 190 of the vibration isolating rubber 182 is formed of a rubber material including a sintered ferrite, conduction loss occurs in electromagnetic waves transmitted from the motor 166 to the support frame 174 through the central elastic portion 188.

Therefore, according to the juicer 160 of this embodiment, the motor 166 can be electrically connected to the support frame 174 without using an electrical connection member such as a cable, and the simple electrical connection Electromagnetic waves radiated to the outside of the apparatus can be reduced as compared with the case where the motor 166 and the support frame 174 are connected by a member.

In this embodiment, the vibration-proof rubber 182 is used.
Although only the case where is used for the juicer 160 has been described, such a vibration-proof rubber 182 can be used as an apparatus, a device, or the like having a structure in which various electric components other than the juicer 160 are supported by a support as a supported body. Can be widely applied to.

[0142]

According to the vibration damping device of the first or sixth aspect, the vibration damping function for suppressing the transmission of vibration by intervening between the support and the supported member is not impaired. In addition to being able to electrically connect to the supported member, conduction loss of electromagnetic waves can be obtained between the supporting member and the supported member.

According to the vibration damping device of the fourth aspect, the support and the supported member are electrically connected without damaging the vibration damping function of suppressing vibration transmission by being interposed between the support and the supported member. And high conduction efficiency with respect to electromagnetic waves in a wide frequency band.

According to the housing-mounted type device according to the eighth aspect,
By using an anti-vibration device that suppresses vibration transmission between the first housing and the second housing, the electromagnetic shielding shields provided in these housings are electrically connected to each other, and between the housings. Therefore, it is possible to suppress the electromagnetic wave radiated outside the device because the conduction loss of the electromagnetic wave can be obtained.

According to the image processing apparatus of the ninth aspect, a vibration isolator for suppressing the transmission of vibration between the image reading apparatus and the image output apparatus is used, and the electromagnetic wave shielding shield provided in these apparatuses is used. Can be electrically connected, and conduction loss of electromagnetic waves between the devices can be obtained, so that electromagnetic waves radiated outside the devices can be suppressed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view along an axial direction showing an example of an anti-vibration rubber used in a copying machine according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a copying machine according to a first embodiment of the present invention.

FIG. 3 is a perspective view showing an anti-vibration rubber in the image reading apparatus (IIT) according to the first embodiment of the present invention.

FIG. 4 is a side sectional view showing the configuration of the copying machine according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view along the axial direction showing a first modification of the vibration-proof rubber used in the copying machine according to the first embodiment of the present invention.

FIG. 6 is a cross-sectional view along the axial direction showing a second modification of the vibration-proof rubber used in the copying machine according to the first embodiment of the present invention.

FIG. 7 is a sectional view along an axial direction showing a third modification of the vibration-proof rubber used in the copying machine according to the first embodiment of the present invention.

FIG. 8 is a sectional view along an axial direction showing a fourth modification of the vibration-proof rubber used in the copying machine according to the first embodiment of the present invention.

FIG. 9 is a cross-sectional view along the axial direction showing Modification Example 5 of the vibration-proof rubber used in the copying machine according to the first embodiment of the present invention.

FIG. 10 is a cross-sectional view along an axial direction showing Modification Example 6 of the vibration-proof rubber used in the copying machine according to the first embodiment of the present invention.

FIG. 11 is a measurement diagram showing a noise electric field intensity of an electromagnetic wave radiated from the copying machine according to the first embodiment of the present invention.

FIG. 12 is a measurement diagram showing the insertion loss of electromagnetic waves obtained by the vibration isolating rubber used in the copying machine according to the first embodiment of the present invention.

FIG. 13 is a measurement diagram showing the insertion loss of electromagnetic waves obtained by the vibration isolating rubber used in the copying machine according to the first embodiment of the present invention.

FIG. 14 is a measurement diagram showing the insertion loss of electromagnetic waves obtained by the vibration-proof rubber used in the copying machine according to the first embodiment of the present invention.

FIG. 15 is a measurement diagram showing a distribution of a noise electric field intensity of an electromagnetic wave radiated from the copying machine according to the first embodiment of the present invention.

FIG. 16 is a measurement diagram showing a distribution of a noise electric field intensity of an electromagnetic wave radiated from the copying machine according to the first embodiment of the present invention.

FIG. 17 is a measurement diagram showing a distribution of a noise electric field intensity of an electromagnetic wave radiated from the copying machine according to the first embodiment of the present invention.

FIG. 18 is a side view showing an example in which the anti-vibration rubber according to the first embodiment of the present invention is used in a copying machine having an image forming device and a paper feeding device.

FIG. 19 is a perspective view and a cross-sectional view showing a configuration of an engine mount structure and an anti-vibration rubber according to a second embodiment of the present invention.

FIG. 20 is a perspective view and a sectional view showing a configuration of a juicer and a vibration-proof rubber according to a third embodiment of the present invention.

FIG. 21 is a perspective view showing a conventional copier having a plurality of housings and an electric gasket for electrically connecting the plurality of housings.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 copier (image processing device) 12 IIT (image reading device) 14 IOT (image output device) 16 housing (second housing) 40 housing (first housing) 44 shield frame unit (second housing) (Shield part) 46 Shield frame part (first shield part) 52 Anti-vibration rubber (anti-vibration device) 56 Elastic deformation part 62 Central elastic body (conductive vibration absorbing part) 64 Outer peripheral elastic body (electromagnetic wave absorbing part) 66 Anti-vibration rubber (Vibration isolation device) 68 Electromagnetic wave shielding unit 72 Anti-vibration rubber (vibration isolation device) 76 Electromagnetic wave absorber 80 Elastic deformation unit (conductive vibration absorption unit) 82 Anti-vibration rubber (vibration isolation unit) 86 Elastic deformation unit (conductive vibration absorption unit) ) 88 Vibration-proof rubber (vibration-proof device) 92 Elastic deformation part (conductive vibration-absorbing part) 94 Vibration-proof rubber (vibration-proof device) 110 Vibration-proof rubber (vibration-proof device) 116 Intermediate elastic piece (split piece) 120 Upper elastic piece (Split piece) 126 Lower part Elastic piece (divided piece) 130 Copier (image processing device) 132 Image forming device 134 Paper feed device 140 Engine mount structure 142 Body frame (support) 144 Engine (supported) 146 Anti-vibration rubber 160 Juicer 166 Motor (Mounted) 170) Flange plate (supported body) 174 Support frame (supported body) 182 Anti-vibration rubber (anti-vibration device)

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2C061 AP03 AP04 BB25 BB35 DF01 DF12 2F078 EA01 EA02 EB02 EC05 2H071 AA22 AA57 BA20 EA14 3D035 CA05 CA25 3J048 AA01 BA03 BA06 BB07 BB10 DA03 EA13

Claims (9)

[Claims] 1. An anti-vibration device interposed between a support and a supported body to suppress transmission of vibration from one of the support and the supported body to the other, wherein the elastic material has conductivity. And is elastically deformed by a load from the support or the supported body,
An anti-vibration device comprising: a conductive vibration absorbing portion that electrically connects the support and the supported body; and an electromagnetic wave absorbing portion that covers an outer peripheral surface of the vibration absorbing portion and absorbs an electromagnetic wave. 2. The vibration damping device according to claim 1, wherein the electromagnetic wave absorbing portion is made of a sintered ferrite or an elastic material obtained by adding a sintered ferrite to a rubber material. 3. An anti-vibration device according to claim 1, further comprising an electromagnetic wave shielding portion that covers an outer peripheral surface of said electromagnetic wave absorbing portion and shields electromagnetic waves. 4. An anti-vibration device interposed between a supporting member and a supported member to suppress transmission of vibration from one of the supporting member and the supported member to the other, wherein the conductive elastic material Comprises, while elastically deforming by a load from the support or the supported body, and having a conductive vibration absorbing section for electrically connecting the support and the supported body, the conductive vibration absorbing section, An anti-vibration device characterized in that two or more divided pieces each made of an elastic material having a different volume specific resistance are integrally combined. 5. The vibration isolator according to claim 1, wherein said conductive vibration absorbing portion is made of conductive rubber. 6. An anti-vibration device which is interposed between a support and a supported body to suppress transmission of vibration from one of the support and the supported body to the other, wherein the conductive elastic material And an electromagnetic wave absorbing material mixed in the elastic material, which is elastically deformed by a load from the support or the supported member, and electrically connects the support and the supported member. An anti-vibration device having a portion. 7. The vibration isolator according to claim 6, wherein said elastic material is a conductive rubber, and said electromagnetic wave absorbing material is a ferrite sintered body. 8. A first housing accommodating an electric component, a first shield portion provided on the first housing so as to cover the accommodated electric component and made of a conductive material; And a second shield mounted on the first housing, the second shield being provided in the second housing so as to cover the stored electrical components, and made of a conductive material. And a vibration isolator interposed between the first housing and the second housing and elastically deformed by a load from the first housing or the second housing, The vibration damping device according to claim 1, 2, 3, 4, 5, 6, or 7 is used as the vibration damping device, and the first vibration damping portion is used for the first vibration damping device.
Wherein the shield portion is electrically connected to the second shield portion. 9. An image reading device that stores an electric component and optically reads a document image, and a first shield portion provided in the image reading device so as to cover the stored electric component and made of a conductive material. An image output device that stores an electric component and records an image on a recording medium based on an image reading signal from the image reading device; and an image output device that is provided in the image output device so as to cover the stored electric component. A second shield portion made of a conductive material, one of which is interposed between the image reading device and the image output device stacked on the other, and is elastically deformed by a load from the image reading device or the image output device. The vibration isolator according to claim 1, 2, 3, 4, 5, 6, or 7 is used as the vibration isolator, and the first vibration is absorbed by the conductive vibration absorber.
An image processing apparatus, wherein the shield part of (1) and the second shield part are electrically connected.