JPH08271257A - Angular velocity sensor unit - Google Patents

Abstract

(57) [Summary] [Object] To provide an angular velocity sensor unit capable of preventing the vibration from the outside of the case from being transmitted to the vibration type angular velocity sensor and improving the airtightness inside the case. A flexible member 7 electrically connects a first circuit board 3 supporting a vibration type angular velocity sensor 2 and a second circuit board 6 having an output signal processing circuit 5 for processing an output signal of the vibration type angular velocity sensor. And the first circuit board is supported by the vibration isolator 4 attached to the case 1, the output terminal 8 of the second circuit board, which is a rigid body, is passed through the case, and a seal member is provided between the output terminal and the case. Adhering 9 in an airtight manner.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration type angular velocity sensor and an angular velocity sensor unit having an output signal processing circuit for processing the output signal of the vibration type angular velocity sensor.

[0002]

2. Description of the Related Art An angular velocity sensor unit of this type is widely used as a direction detecting device for a navigation system or the like. By the way, when this is attached to a moving body such as a vehicle, the moving body may vibrate, which may deteriorate the detection accuracy of the vibration type angular velocity sensor. Therefore, it is desired to prevent the vibration of the moving body from being transmitted to the vibration type angular velocity sensor.

Therefore, conventionally, the following are known as the angular velocity sensor unit in which the influence of vibration is reduced. This is attached to the case, a case, a circuit board arranged in the case, supporting a vibration type angular velocity sensor and an output signal processing circuit for processing an output signal of the vibration type angular velocity sensor, and electrically connected to them. And a vibration isolator made of an elastic material that supports the circuit board, and a large number of flexible wires that are electrically connected to the circuit board and an external signal processing circuit so as to penetrate the case and are bundled. It is a thing.

In this case, since the circuit board supporting the vibration type angular velocity sensor is supported by the vibration isolator,
Even if the case vibrates due to vibration of the moving body or the like, it is possible to prevent the vibration from being transmitted to the vibrating angular velocity sensor via the circuit board. Further, since the circuit board and the external signal processing circuit are electrically connected by a large number of flexible wires, the vibration of the external signal processing circuit is transmitted to the vibration type angular velocity sensor via the circuit board. Can be prevented.

[0005]

However, in this one, since a large number of bundled flexible wires are used to electrically connect the circuit board and the external signal processing circuit, each flexible wire is used. There is a problem that a gap is generated between the flexible wires, and as a result, the airtightness inside the case is deteriorated. Therefore, since moisture or the like outside the case may enter the inside of the case through the gap, the signal processing circuit or the like may be condensed to cause malfunction.

In order to avoid the occurrence of the gap,
It may be possible to separate the flexible wires one by one, but in this case, the strength of the flexible wires becomes weak and there is a risk of breaking.

Therefore, it is a technical object of the present invention to provide an angular velocity sensor unit which can prevent the vibration from the outside of the case from being transmitted to the vibration type angular velocity sensor and can improve the airtightness inside the case. This is an issue.

[0008]

The technical means taken in the invention of claim 1 to solve the above technical problems are as follows:
A case; a first circuit board arranged in the case to support the vibration type angular velocity sensor and electrically connected to the case; a vibration isolator made of an elastic material attached to the case and supporting the first circuit board; A second circuit board, which has an output signal processing circuit for processing an output signal from the angular velocity sensor, and which is electrically connected to the first and second circuit boards; It is provided with an output terminal which is a rigid body electrically connected to the circuit board and penetrating the case, and a seal member for airtightly adhering the output terminal and the case so as to make the inside of the case hermetically sealed.

[0009]

According to the above technical means, since the first circuit board supporting the vibration type angular velocity sensor is supported by the vibration isolator,
Even if the case vibrates due to some influence, it is possible to prevent the vibration from being transmitted to the vibrating angular velocity sensor via the first circuit board by the action of the vibration isolator. Further, since the first circuit board supporting the vibration type angular velocity sensor and the second circuit board having the output signal processing circuit are electrically connected by the flexible member, even if vibration is transmitted from the outside to the rigid output terminal. The action of the flexible member can prevent the vibration from being transmitted from the second circuit board to the vibration type angular velocity sensor via the first circuit board. As described above, it is possible to prevent the detection accuracy of the vibration type angular velocity sensor from being deteriorated due to the influence of external vibration.

As described above, since the first and second circuit boards are connected by the flexible member, the output terminal of the second circuit board can be made rigid. As a result, the strength of the output terminals can be secured without bundling the output terminals, and it is possible to avoid the generation of the gap as in the conventional technique. Here, according to the above technical means, the rigid output terminal is adopted, and the output terminal and the case are airtightly adhered by the seal member so that the case is hermetically sealed, so that the airtightness inside the case is good. It will be Therefore, it is possible to prevent moisture or the like outside the case from entering the inside of the case.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS This embodiment will be described below with reference to the accompanying drawings.

The structure of the angular velocity sensor unit of the first embodiment will be described with reference to FIGS.

The angular velocity sensor unit shown in FIGS. 1 to 3 is attached to a moving body such as an automobile or a ship, and has a case 1 and a crystal type angular velocity sensor (vibration type angular velocity sensor).
2, a first circuit board 3, a vibration isolator 4, an output signal processing circuit 5, a second circuit board 6, a flexible wire (flexible member) 7, an output terminal 8, and a sealing member 9. It has and.

The case 1 is composed of a cylindrical case body 11 having an internal space 11a and an opening 11b at the lower end in FIG. 2, and a base 12 having a U-shaped cross section and arranged in the internal space 11a. The base 12 is fixed to the case body 11 so as to close the opening 11b. Base 12
Has a bottom portion 12a and two projecting portions 12b and 12b that project upward from the bottom portion 12a in FIG.

The crystal type angular velocity sensor 2 detects a Coriolis force generated in a direction perpendicular to the vibrating direction when an angular velocity is applied to a vibrating object. The crystal type angular velocity sensor 2 is arranged in the internal space 11 a and is supported by the first circuit board 3. A piezoelectric vibration type angular velocity sensor such as a gyro sensor may be adopted. The first circuit board 3 is electrically connected to the crystal angular velocity sensor 2. The vibration isolator 4 includes the protruding portions 12b, 12b of the base 12.
The first circuit board 3 is supported by the first circuit board 3 so that the vibration is not transmitted from the base 12 to the first circuit board 3. The vibration isolator 4 is formed of an elastic body such as rubber.

The output signal processing circuit 5 calculates the azimuth from the output signal (angular velocity detection signal) detected by the crystal type angular velocity sensor 2. The output signal processing circuit 5 is supported by the second circuit board 6 arranged in the internal space 11a. The second circuit board 6 is electrically connected to the output signal processing circuit 5 and is held by the protrusions 12 b and 12 b of the base 12. The flexible wire 7 is for electrically connecting the first and second circuit boards 3 and 6 to prevent transmission of vibration from the second circuit board 6 to the first circuit board 3.

The output terminal 8 electrically connects the second circuit board 6 and an external signal processing circuit (for example, a positioning device for navigation system). The output terminal 8 is
The upper end of the second circuit board 6 is soldered to the lower end of FIG. 2 with solder 8a, and the lower end is connected to an external signal processing circuit via a connector (not shown). The output terminal 8 is made of a rigid body, and a plurality of output terminals 8 are provided at predetermined intervals (here, 3
Book), each of which penetrates the bottom portion 12a of the base 12.

As shown in FIGS. 2 and 3, the seal member 9
Seals the output terminal 8 and the bottom 12a of the base 12 in an airtight manner, and also seals the bottom 12a of the base 12 and the case body 11 in an airtight manner. The seal member 9 is
A concave portion 12d formed between the case main body 11 and an annular projecting wall 12c that is made of an adhesive obtained by dissolving an epoxy resin in a solvent and projects downward from the bottom 12a of the base 12 in FIG.
Is formed by filling the adhesive with the adhesive. The seal member 9 can make the internal space 11a a completely closed space.

Incidentally, four stud pins 10 are fitted and fixed to the base 12. This stud pin 10
The case 1 serves to position the case 1 when it is assembled to the main body including an external signal processing circuit and to reinforce the base 12.

The method of assembling the angular velocity sensor unit constructed as described above will be briefly described below.

First, the crystal type angular velocity sensor 2 is assembled to the first circuit board 3, the signal processing circuit 5 is formed on the second circuit board 6, and the first and second circuit boards 3 and 6 are connected to a flexible wire. 7
To electrically connect.

Next, the three output terminals 8 are attached to the bottom portion 12a of the base 12 so as to penetrate the bottom portion 12a of the base 12. Next, the vibration isolator 4 is assembled to the base 12.

Next, the first circuit board 3 is assembled to the vibration isolator 4, and the second circuit board 6 is assembled to the base 12.
Then, the upper ends of the output terminals 8 are soldered to the second circuit board 6.

Finally, the concave portion 12d formed between the case body 11 and the protruding wall 12c of the base 12 is filled with an adhesive in an upward direction, and is heat treated to be solidified.
As a result, the output terminals 8 and the base 12 and the base 12 and the case body 11 are hermetically adhered to each other. In this way, the angular velocity sensor unit is assembled.

As shown above, the crystal type angular velocity sensor 2
Since the first circuit board 3 for supporting the vibration is supported by the vibration isolator 4, even if the case body 11 vibrates due to some influence, the vibration is caused by the vibration isolator 4 through the first circuit board 3 in the crystal type. It can be prevented from being transmitted to the angular velocity sensor 2. Further, since the first circuit board 3 supporting the crystal type angular velocity sensor 2 and the second circuit board 6 having the output signal processing circuit 5 are electrically connected by the flexible wire 7, the rigid output terminal 8 is externally provided. Even if the vibration is transmitted to the crystal type angular velocity sensor 2, it is possible to prevent the vibration from being transmitted from the second circuit board 6 to the crystal type angular velocity sensor 2 through the first circuit board 3 by the action of the flexible wire 7. As described above, it is possible to prevent the detection accuracy of the crystal angular velocity sensor 2 from being deteriorated due to the influence of external vibration.

Furthermore, since the first and second circuit boards 3 and 6 are connected by the flexible wire 7, the output terminal 8 of the second circuit board 6 can be made rigid. As a result, the strength of the output terminals 8 can be secured without bundling the output terminals 8, and the generation of a gap as in the conventional technique can be avoided. Here, according to the first embodiment, the rigid output terminal 8 is adopted, and the output terminal 8 and the case 1 are airtightly bonded by the seal member 9 so that the inside of the case 1 is sealed. Good airtightness inside. Therefore, it is possible to prevent moisture or the like outside the case from entering the inside of the case.

The configuration of the angular velocity sensor unit of the second embodiment will be described below with reference to FIGS.

As shown in FIGS. 4 to 6, the angular velocity sensor unit of the second embodiment also has a case 1'and a crystal type angular velocity sensor (vibration type angular velocity sensor), like the angular velocity sensor unit of the first embodiment. 2, the first circuit board 3, and the vibration isolator 4
An output signal processing circuit 5, a second circuit board 6 ', a flexible wire (flexible member) 7, an output terminal 8', and a seal member 9 '. Among these, the configurations of the crystal type angular velocity sensor 2, the first circuit board 3, the vibration isolator 4, the output signal processing circuit 5 and the flexible wire 7 are the same as those of the first embodiment, and therefore the description thereof will be made. Omit it.

The case 1'includes a cylindrical case body 11 having the internal space 11a and an opening 11b at the lower end of FIG. 6 (same as that of the first embodiment), and a U-shaped cross section arranged in the internal space 11a. The base 12 'is shaped like a base. The base 12 'is fixed to the case body 11 so as to close the opening 11b. The base 12 'has a bottom 12a'
And two projecting portions 12b 'and 12b' projecting upward from the bottom portion 12a 'in FIG.

As shown in FIG. 6, 4 of the second circuit board 6 '
The corner is cut diagonally and has a taper 6a '. Further, a claw portion 12c 'is provided at the tip portion (upper end in FIG. 6) of each protruding portion 12b' of the base 12 '. This claw portion 12c 'locks the taper 6a' of the second circuit board 6'to prevent the second circuit board 6'from falling due to gravity when the angular velocity sensor unit is turned upside down (upside down in FIG. 6). Can be prevented.

The output terminal 8 ', like the first embodiment, electrically connects the second circuit board 6'and an external signal processing circuit (not shown), and each of them has a predetermined value. It is provided at intervals and is made of a rigid body. Here, four output terminals 8'are provided.

As shown in FIG. 7, the output terminal 8'is
A vertical portion 8a ′ extending in a direction orthogonal to the surface of the circuit board 6 ′ and a parallel portion 8b ′ connected to the vertical portion 8a ′ and extending in parallel to the surface of the second circuit board 6 ′. ing. One end (free end) of the vertical portion 8a ′ is soldered to the second circuit board 6 ′ with the solder 8a, and the other end (connection end with the parallel portion 8b ′) is held by the holder 80. Parallel part 8
b ′ penetrates the bottom portion 12a ′ of the base 12 ′.
One end of the parallel portion 8b '(a connecting end with the vertical portion 8a') is held by the holder 80, and the other end (free end) is electrically connected to an external signal processing circuit via a connector (not shown). It is connected. Here, the output terminal 8'is fixed to the holder 80 by insert molding.

The seal member 9 ′ hermetically adheres the parallel portion 8b ′ of the output terminal 8 ′ and the bottom portion 12a ′ of the base 12 ′ and hermetically seals the bottom portion 12a ′ of the base 12 ′ and the case body 11. Is glued to. Seal member 9 '
Is made of an adhesive agent in which an epoxy resin is dissolved in a solvent, as in the first embodiment, and is formed in the recess 12d ′ (see FIG. 8) formed between the bottom portion 12a ′ of the base 12 ′ and the case body 11. It is formed by filling an adhesive.
The inner space 11a can be made into a completely enclosed space by the seal member 9 '.

The base 12 has a stud pin hole 10a into which a stud pin (not shown) is inserted.

The method of assembling the angular velocity sensor unit constructed as described above will be briefly described below.

First, as shown in FIG. 9, the first circuit board 3
The crystal type angular velocity sensor 2 is formed on the upper side, and the output signal processing circuit 5 is formed on the second circuit board 6 '. The flexible wire 7 is then connected to the first and second circuit boards 3, 6 '. Next, the vertical portions 8a ′ of the four output terminals 8 ′ with the holder 80 are penetrated through the second circuit board 6 ′ at a predetermined interval, and then the tip portions of the vertical portions 8a ′ (in the plane of FIG. 9). The end portion) is soldered to the second circuit board 6 '. Note that these steps may be interchanged.

Next, the first and second circuit boards 3 and 6'are removed from the state of FIG. 9 and the vibration isolator 4 is attached to the first circuit board 3. Then, these integrated parts are assembled to the base 12 '. At this time, when the second circuit board 6'is assembled to the base 12 ', the taper 6a' of the second circuit board 6'is locked to the claw portion 12c 'of the base 12', so that the angular velocity sensor unit is turned upside down ( It prevents the second circuit board 6'from falling due to gravity when it is turned upside down. Next, as shown in FIGS. 6 and 7, the parallel portions 8b ′ of the four output terminals 8 ′ are made to penetrate the bottom portion 12a ′ of the base 12 ′.

Next, the case body 11 is covered from above so as to cover the integrated parts. After that, the parts assembled so far are turned upside down to fill the recesses 12d 'with an adhesive and heat-treat to solidify. As a result, the output terminals 8'and the base 12 'and the base 12' and the case body 11 are hermetically adhered to each other. In this way, the angular velocity sensor unit is assembled.

In this way, the second circuit board 6'is used as the base 1
Before mounting to 2 ', connect the output terminal 8'to the second circuit board 6'.
Since it is soldered to, it is not necessary to solder it by hand, and the number of steps can be reduced. Furthermore, continuous work is easy and suitable for mass production.

[0040]

The invention of claim 1 has the following effects.

Since the first circuit board supporting the vibrating angular velocity sensor is supported by the vibration isolator, even if the case vibrates due to some influence, the vibration of the case vibrates via the first circuit board due to the action of the vibration isolator. The transmission to the angular velocity sensor can be prevented. Further, since the first circuit board supporting the vibration type angular velocity sensor and the second circuit board having the output signal processing circuit are electrically connected by the flexible member, even if vibration is transmitted from the outside to the rigid output terminal. The action of the flexible member can prevent the vibration from being transmitted from the second circuit board to the vibration type angular velocity sensor via the first circuit board. As described above, it is possible to prevent the detection accuracy of the vibration type angular velocity sensor from being deteriorated due to the influence of external vibration.

As described above, since the first and second circuit boards are connected by the flexible member, the output terminal of the second circuit board can be made rigid. As a result, the strength of the output terminals can be secured without bundling the output terminals, and it is possible to avoid the generation of the gap as in the conventional technique. Here, since the rigid output terminal is adopted and the output terminal and the case are airtightly adhered by the seal member so as to make the inside of the case hermetically sealed, the airtightness inside the case becomes good. Therefore, it is possible to prevent moisture or the like outside the case from entering the inside of the case.

[0043]

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an angular velocity sensor unit according to a first embodiment.

FIG. 2 is a sectional view taken along line AA in FIG.

3 is an X view in FIG. 2. FIG.

FIG. 4 is a sectional view of an angular velocity sensor unit according to a second embodiment.

5 is a sectional view taken along line BB in FIG.

6 is a cross-sectional view taken along line CC of FIG.

7 is a cross-sectional view taken along the line DD in FIG.

FIG. 8 is a Y view in FIG.

FIG. 9 is a cross-sectional view of the first and second circuit boards before assembly.

[Explanation of symbols]

 1, 1'Case 2 Crystal type angular velocity sensor (vibration type angular velocity sensor) 3 First circuit board 4 Vibration isolator 5 Output signal processing circuit 6, 6'Second circuit board 7 Flexible wire (flexible member) 8 Output Terminal 9, 9'Seal member

Claims (1)

[Claims] 1. A case, a first circuit board which is disposed in the case, supports the vibration type angular velocity sensor and is electrically connected to the case, and is attached to the case and supports the first circuit board. A vibration isolator made of an elastic material, an output signal processing circuit for processing an output signal from the vibration type angular velocity sensor, and a second circuit board arranged in the case, the first and second circuit boards. A flexible member electrically connecting to the second circuit board, a rigid output terminal electrically connected to the second circuit board and penetrating the case, the output terminal and the case so as to make the case hermetically sealed. An angular velocity sensor unit including a sealing member that hermetically adheres between the two.