JP2002232177A - Shielding structure for electronic unit case - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the shielding structure of an electronic unit case where a shield member is formed on the sidewall face of the electronic unit case, and various electronic units stored in the electronic unit case are protected from a radio signal, a noise signal or an electrostatic signal. SOLUTION: A resin case 1, having an almost cubic shape, is the electronic unit case and it is an automatic toll calculating system (ETS) unit case for freeways. The resin case 1 is constituted of a base 2a, four inner faces 2b to 2e and one face part below a cover 4f. The shielding member 2 is formed and constituted in all five sidewall faces. When the radio signal, the noise signal or the electrostatic signal is inputted from the outside, the signals are formed in the inner faces 2b to 2e of the resin case and one face below the cover 4f, are absorbed or reflected by the shielding member 2. Respective signal faults are prevented from being given to various electronic components 6b and an electronic circuit 6a or the unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to various electronic devices, in which a shielding member made of an aluminum foil plate, a metal foil plate, or the like is formed on the inner wall surface of the electronic device case so that an external radio signal, noise signal, or static electricity is formed. The present invention relates to a novel electronic device case shield structure for preventing a failure due to a signal.

[0002]

2. Description of the Related Art In the prior art, for example, in the case of electrical equipment for automobiles, a board is fixed to the bottom of the equipment case, and various electronic circuits, electronic components or units are mounted on the board. . The device case is made of metal or resin. Thus, when a radio signal, noise noise, or an electrostatic signal is input from the outside to the vehicle electrical equipment, these electronic circuits, electronic components, or units disposed in the equipment case are provided with these signals. When a signal was given, each failure occurred, and the automotive electrical equipment sometimes malfunctioned.

[0003]

According to the above prior art, there are the following problems. In various electronic devices, in order to prevent failures due to radio waves, noise, or static electricity, all of the various electronic circuits, electronic components, or units mounted on the board at the bottom of the electronic device case must be individually shielded. There is a problem that it is necessary to protect, a large number of shield cases must be prepared for each case, the number of steps for installing the shield case increases, and the electronic device case itself becomes large. If various electronic devices do not have a structure to prevent each obstacle due to radio waves, noise, or static electricity, the various electronic devices are exposed to obstacles such as radio waves, and the electronic devices do not perform their intended functions. There was a problem. There is also a method of metal-plating various electronic device cases, but in this case, the entire electronic device case is plated,
There are various problems such as the appearance of the equipment case requiring painting and the like, and the inside of the equipment case not requiring painting requires a masking step.

[0004]

SUMMARY OF THE INVENTION According to the present invention, an electronic circuit, an electronic component, or a unit provided in a case of an electronic device is provided with a radio wave, a noise, or a static electricity by adding a simple configuration to a conventional case of various electronic devices. A technique for preventing a failure, which is intended to solve the above-described problem, employs the following configuration and means.

According to the first aspect of the present invention, there is provided a shield structure for an electronic device case, wherein a shield member is formed on an inner wall surface of the electronic device case.

According to a second aspect of the present invention, there is provided the shield structure for an electronic device case according to the first aspect, wherein the shield member is made of a metal foil plate.

According to the third aspect of the present invention, the electronic equipment case is an expressway automatic toll calculation system (ETS).
The shield structure for an electronic device case according to claim 1 or 2, wherein the shield structure comprises an device case.

According to the fourth aspect of the present invention, a shielding structure for an electronic device case according to claim 1 or 2, wherein the electronic device case is characterized by comprising the navigation device case.

According to the fifth aspect of the invention, claim 1 electronic device case is characterized by comprising a computer case
Or a shield structure of the electronic device case according to 2.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a shield structure for an electronic device case according to the present invention will be described below with reference to the accompanying drawings. 1 and 2 are perspective views showing Embodiments 1 and 2 of a shield structure of an electronic device case according to the present invention.

[0011]

First Embodiment FIG. 1 shows an example of a resin case in which a substrate is not fixed, and 1 is a resin case having a substantially cubic shape. The resin case 1 is, for example, an electronic device case, such as an electronic device case related to various telecommunications and automobiles, such as an automatic toll calculation system (ETS) device case for an expressway, a navigation device case, or a personal computer case.

A resin case 1 having a substantially cubic shape.
The inner surface has one bottom surface portion 2a and four inner surface portions 2b to 2
e and one lower surface of the upper lid (not shown), and the shield member 2 is integrally formed on these five side walls. The shield member 2 is made of a thin metal plate such as an aluminum foil plate, a copper foil plate, a plating plate, or the like. The shield member 2 is made of a shielding material such as radio waves, noise, electromagnetic waves or static electricity, that is, a polymer. It is a composite conductive material obtained by dispersing conductive powder. The shield member 2 has a function of absorbing and reflecting unnecessary radio wave, noise, or static energy, thereby preventing energy transmission from the surface.

As a method for integrally forming the shield member 2 on the bottom surface 2a and the four inner side surfaces 2b to 2e of the resin case 1 of the electronic device, a conductive polymer is formed on the entire five side walls of the resin case 1. performing a surface treatment for forming a film. In addition, a conductive filler is mixed into the material of the resin case 1 of the electronic device to form the resin case 1 by compounding.
There is a method in which conductive the. Here, the conductive polymer film is made of a polymer material containing a large amount of fine particles such as carbon black, silver, and copper.

Reference numeral 2f denotes a plurality of holes provided on the surface of the shield member 2, and a part of the entire side wall surface 2a to 2e of the resin case 1 is exposed from the hole 2f. The resin protrudes from the hole 2f, thereby increasing the degree of adhesion between the shield member 2 and the resin case 1. In addition, in the shield structure of the electronic device case according to the present invention, technical effects can be achieved without providing the hole 2f in the shield member 2.

Next, an outline of the production method in the first embodiment of the shield structure of the electronic device case according to the present invention will be described. First, a molding die for molding a case having a predetermined shape, for example, a substantially cubic shape. The resin material is poured and fixed, and the resin case 1 is completed. The resin case 1 has an inner surface with a bottom surface 2a, a right inner surface 2b, and a left inner surface 2
c, front inner surface 2d, rear inner surface 2e, and lower surface of upper lid
(Not disclosed), and these are collectively referred to as so-called side wall surfaces 2a to 2e.

When the shield member 2 is made of a thin metal foil, such as an aluminum foil, a copper foil, or a tin foil, when the resin case (top cover) 1 is formed, the thin metal plate 2 made of the aluminum foil or the like is used. Is set in a molding die, integrated by injection of a resin material, solidified, and the thin metal foil plate 2 such as the aluminum foil is placed on the bottom surface 2 of each of the resin cases 1.
a, A thin metal plate 2 such as an aluminum foil is formed on the four inner side surfaces 2a to 2e. Thus, Embodiment 1 of the present invention
The shield structure of the electronic device case shown in FIG.

In the electronic device case shield structure according to the first embodiment of the present invention, when a radio signal, a noise signal, or an electrostatic signal is input from outside, these signals are transmitted to the resin case 1. Absorbed or reflected by the shield member 2 formed on the bottom surface portion 2a and the four inner side surface portions 2b to 2e, and impairs various electronic components, electronic circuits or units (not shown) installed inside the electronic device case 1. It is protected from radio signals, noise signals or electrostatic signals. The various electronic components or electronic circuits or units are, for example, an automatic toll calculation system for a highway.
(ETS) It is composed of a device case, a navigation device case, a personal computer case and the like.

[0018]

Embodiment 2 FIG. 2 shows an electronic device case provided with an electronic circuit board 3, which is formed of resin. Reference numeral 4 denotes an upper lid having a substantially cubic shape, which serves as a resin case. The resin case, that is, the upper cover 4 is, for example, an electronic device case, and various electronic, communication, and automobile-related device cases such as an expressway automatic toll calculation system (ETS) device case, a navigation device case, and a personal computer case. It is.

The upper lid 4 has an open bottom surface 4a, and the inner surface has one lid lower surface portion 4f and four inner surface portions 4b.
To 4e, and the shield member 5 is formed on the entire lid lower surface portion 4f and the four inner surface portions 4b to 4e. The shield member 5 is made of, for example, a thin metal plate such as an aluminum foil plate. The shield member 5 is formed by dispersing conductive powder in a shielding material such as radio waves, noise, electromagnetic waves or static electricity, that is, a polymer. The resulting composite conductive material and the like. The shield member 5 has a function of absorbing and reflecting unnecessary radio wave, noise, or static energy, thereby preventing energy transmission from the surface.

The shield member 5 is connected to the inner surface portions 4b to 4e of the resin case (upper lid) 4 of the electronic device and the lower surface portion 4f of the lid.
As a method of integrally forming the resin case 4, a surface treatment for forming a conductive polymer film on the five inner side surfaces 4b to 4e and 4f of the resin case 4 is performed. Further, a conductive filler and a method of electrification guide the resin case 4 of the electronic device the resin case 4 by the material composite is mixed in the (upper lid) (lid). Here, the conductive polymer film is made of a polymer material containing a large amount of fine particles such as carbon black, silver, and copper.

In the figure, the structure of the shield member 5 is the same as that of the first embodiment of the present invention, and the description is omitted.

Next, the production method in the second embodiment of the shield structure for an electronic device case according to the present invention will be outlined. First, a molding die for molding a case having a predetermined shape, for example, a substantially cubic shape, is used. The resin material is poured and fixed, and the resin case (upper lid) 4 is completed. The resin case (upper lid) 4 has an inner surface composed of a right inner surface 4b, a left inner surface 4c, a front inner surface 4d, a rear inner surface 4e, and a lid lower surface 4f. is there.

When the shielding member 5 is a thin metal plate such as an aluminum foil, a copper foil, or a tin foil, the thin metal plate 5 such as the aluminum foil is formed when the resin case (top lid) 4 is formed. Is set in a molding die, integrated by injection of a resin material, solidified, and the respective inner surface portions 4b to 4e and the lower surface portion 4 of the resin case (upper lid) 4 are formed.
A thin metal plate such as an aluminum foil is formed on f. Thus, the shield structure of the electronic device case according to the second embodiment of the present invention is completed.

The second embodiment of the shield structure of the electronic device case according to the present invention is characterized in that the electronic circuit board 3 is provided with the above-mentioned electronic circuit board 3. The electronic components 6b and the like are mounted thereon to constitute a board for an automatic toll calculation system (ETS) device for an expressway, a navigation device, and the like.

The left, right, front and rear outer walls 4g to 4j of the upper lid 4
Is suspended from the upper surface 4k, and engagement holes 41 and 4m are respectively provided in a part of the outer wall portions 4g and 4h. The engaging holes 41 and 4m disposed opposite to each other lock the projections 3b and 3c formed on the left and right sides of the electronic circuit board 3, respectively, and provide an electronic circuit board including the electronic circuit 6a and the electronic component 6b. 3 is fixed to the resin case (top lid) 4.

In the shield structure of the electronic device case according to the second embodiment of the present invention, when a radio signal, a noise signal, or an electrostatic signal is input from outside, these signals are transmitted to the resin case (top cover). ) 4 inner surface part 4
It is absorbed or reflected by the shield members 5 formed on the b to 4e and the lower surface 4f of the lid, and does not impair the various electronic components 6b, the electronic circuit 6a or the unit (not shown) installed inside the resin case 1. And is protected from radio signals, noise signals or electrostatic signals. Various electronic components 6
The electronic circuit 6a or the electronic circuit 6a or the unit is arranged and configured inside, for example, an expressway automatic toll calculation system (ETS) equipment case, a navigation equipment case, a personal computer case, and the like.

[0027]

The shield structure of the electronic device case according to the present invention has the above-described configuration and operation, and thus has the following effects.

According to the first aspect of the present invention, there is provided a shield structure for an electronic device case, wherein a shield member is formed on an inner wall surface of the electronic device case. Claim 2
According to the invention described above, the shield structure of the electronic device case according to claim 1, wherein the shield member is made of a metal foil plate. According to the invention described in claim 3,
2. The electronic equipment case comprises an expressway automatic toll calculation system equipment (ETS) case.
Or a shield structure for an electronic device case according to 2. According to the fourth aspect of the present invention, there is provided a shield structure for an electronic device case according to the first or second aspect, wherein the electronic device case is a navigation device case. According to a fifth aspect of the present invention, there is provided the electronic device case shielding structure according to the first or second aspect, wherein the electronic device case is a personal computer case. It is not necessary to protect all of the various electronic circuits, electronic components or units mounted on the board at the bottom of the electronic device case with each shield case, and there is no need to prepare a large number of each shield case. The number of steps for installing the members is small, and the size of the electronic device case itself can be reduced. According to the present invention, since a structure for completely preventing each trouble due to radio waves, noise, or static electricity is provided, the various electronic devices perform their intended functions without being exposed to troubles such as radio waves. This eliminates the need to replace electronic components and the like. ADVANTAGE OF THE INVENTION According to this invention, the method of metal-plating various electronic device cases is unnecessary, and the defect based on the said metal-plating process is eliminated, and the electronic device case which carried out shield molding by a simple procedure can be produced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a shield structure of an electronic device case according to the present invention.

FIG. 2 is a perspective view showing Embodiment 2 of a shield structure of an electronic device case according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 resin case 2 shield member 2 a bottom surface of resin case 2 b right inner surface of resin case 2 c left inner surface of resin case 2 d front inner surface of resin case 2 e rear inner surface of resin case 2 f hole 3 electronic circuit board 3 a electronic circuit board 3b, 3c Projection 4 Resin case (upper lid) 4a Bottom part 4b Right inner side part 4c Left inner side part 4d Front inner side part 4e Rear inner side part 4f Cover lower part part 4g-4j Outer wall part 41, 4m Engagement hole 5 Shield member 6a Electronic circuit 6b Electronic component

Claims (5)

[Claims] 1. A shield structure for an electronic device case, wherein a shield member is formed on an inner wall surface of the electronic device case. 2. The shield structure for an electronic device case according to claim 1, wherein said shield member is made of a metal foil plate. 3. The shield structure for an electronic device case according to claim 1, wherein the electronic device case is an ETS case for an automatic toll calculation system for an expressway. 4. The shield structure for an electronic device case according to claim 1, wherein the electronic device case is a navigation device case. 5. The shield structure for an electronic device case according to claim 1, wherein the electronic device case is a personal computer case.