JPH06123629A - Piezoelectric vibration gyroscope - Google Patents

Abstract

PURPOSE:To provide a highly accurate, small-sized, and inexpensive piezoelectric vibration gyroscope capable of precisely positioning a max. sensitivity axis. CONSTITUTION:An electrode 15 for electrically connecting the strip-like electrode of a vibrator 1 to a printed circuit board and a positioning pin 16 for setting the attaching position of the vibrator 1 to the printed circuit board are provided on a vibrator support member 14. The positioning pin 16 is used as the input/ output terminal of the circuit board. A step 22 for setting the height of the circuit board is formed to the case 21 for mounting the circuit board. After the circuit board is inserted in the case 21, the circuit board is sealed with a resin 23 from the rear thereof. The positioning pin 16 is consistently used as the positioning standard of a max. sensitivity axis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microminiature piezoelectric vibrating gyro used as a camera shake sensor of a camera-integrated VTR among gyroscopes, and more particularly to a strip-shaped electrode on the outer peripheral surface of a piezoelectric ceramic cylinder or pipe. The present invention relates to a piezoelectric vibration gyro using a formed piezoelectric vibrator.

[0002]

2. Description of the Related Art A piezoelectric vibrating gyro is an angular velocity sensor utilizing a mechanical phenomenon in which when a vibrating object is given a rotational angular velocity, a Coriolis force is generated in a direction perpendicular to the vibrating direction.

Generally, in a decoupled vibration system configured to be able to excite vibrations in two different directions orthogonal to each other, when one of the vibrations is excited and the vibrator is rotated, the above-mentioned Coriolis force causes the vibration. A force acts in a direction perpendicular to the vibration, and the other vibration is excited.

Since the magnitude of the vibration is proportional to the magnitude of the vibration on the input side and the rotational angular velocity, a constant input voltage is applied to this vibration system to make the magnitude of the vibration on the input side constant. By doing so, the magnitude of the rotational angular velocity can be obtained from the magnitude of the output voltage proportional to the magnitude of this vibration.

FIG. 5 shows a piezoelectric vibrator for explaining the principle of a piezoelectric vibrating gyroscope using a piezoelectric vibrator made of a piezoelectric ceramic cylinder, which is the background of the present invention.

This piezoelectric vibrator is constructed by forming a plurality of strip electrodes 2 parallel to the length direction of the vibrator 1 on the outer peripheral surface of the vibrator 1 made of a piezoelectric ceramic cylinder.

The vibrator 1 is polarized by using the strip electrode 2, and then an AC voltage substantially equal to the resonance frequency of the bending vibration of the vibrator is applied to the strip electrode 2 to form a solid line in FIG. A bending vibration in the direction of arrow 4 is excited, and in this state, when the vibrator 1 is rotated with the central axis of the ceramic cylinder (maximum sensitivity axis 5 of the piezoelectric vibration gyro) as the rotation axis, Coriolis force is generated in the direction,
A voltage proportional to the rotational angular velocity applied to the vibrator 1 is generated in another strip electrode.

The vibrator 1 is fixed to a pedestal portion 7 of a vibrator supporting member 6 having a structure as shown in FIG. 6 with silicon rubber or the like, and mounted on a circuit board 11 having a structure as shown in FIG. .

A plurality of electrodes 8 for fixing and electrically connecting to the circuit board 11 are formed on the conventional vibrator supporting member 6, and the strip-shaped electrodes of the vibrator 1 are attached to each of these electrodes 8. The lead wires 3 (see FIG. 5) drawn out from each of the two are connected.

As shown in FIG. 7, an electrode 8 of the vibrator support member 6 and a drive / detection circuit (which is mounted on the circuit board 11) are mounted on the mounting portion of the vibrator support member 6 of the conventional circuit board 11. Electrode 9 for electrically connecting and fixing (not shown)
Are formed.

An input / output terminal 10 made of a lead frame or the like is formed on the outer periphery of the circuit board 11.

The vibrator supporting member 6 to which the vibrator 1 is fixed as described above is connected to the circuit 8 by soldering the electrode 8 and the electrode 9 of the circuit board 11 as shown in FIG. It is fixed on the substrate 11.

As shown in FIG. 8, the circuit board 11 on which the vibrator 1 and the vibrator support member 6 are mounted is covered by a case lid 13 made of an insulating resin or the like fitted in a metal case 12. After positioning the input / output terminals 10 of the circuit board 11 so as not to contact the metal case 12,
It is enclosed in the metal case 12.

[0014]

By the way, the piezoelectric vibrating gyroscope described above is an angular velocity sensor for detecting a rotational angular velocity with the maximum sensitivity axis 5 in the length direction of the vibrator 1, as shown in FIG. Yes, and usually does not react to rotation with the direction orthogonal to the maximum sensitivity axis 5 as the axis of rotation.

However, this type of piezoelectric vibrating gyroscope has a problem that when the mounting axis of the vibrator 1 is deviated, a rotational component in a direction that should not react is detected and an error output is generated.

Therefore, in this type of piezoelectric vibrating gyro, the vibrator 1 and the vibrator support member 6 are mounted on the circuit board 11 so that the center of rotation of the vibrator 1 exactly coincides with the maximum sensitivity axis 5. There was a need.

However, since the conventional piezoelectric vibrating gyro is not provided with the positioning means for the vibrator supporting member 6 with respect to the circuit board 11, the mounting position of the vibrator supporting member 6 on the circuit board 11 is adjusted. Depends largely on the operator's feeling.

Therefore, in this conventional piezoelectric vibrating gyro, when the vibrator support member 6 of the vibrator 1 is connected and fixed to the circuit board 11 by soldering or the like, the vibrator to the circuit board 11 is fixed. There is a problem that the mounting position of the support member 6 is easily displaced, and an error output is likely to occur due to displacement of the maximum sensitivity axis 5 of the vibrator 1.

Further, in this conventional piezoelectric vibration gyro,
In all steps from the assembly of this gyro to its installation in the system, it is difficult to position the maximum sensitivity axis with high accuracy because the installation error of the component without the positioning means is added up. It was

Furthermore, since the input / output terminal 10 of the circuit board 11 of the conventional piezoelectric vibrating gyro is provided on the outer periphery of the circuit board 11, when the circuit board 11 is inserted into the metal case 12, Input / output terminal 1 of circuit board 11
The case lid 13 must be used to prevent contact (short circuit) between 0 and the metal case 12, and there is a drawback that the overall outer diameter dimension increases.

The present invention has been made in view of the above points, and an object thereof is to enable precise positioning of the maximum sensitivity axis. It is to provide a highly accurate small-sized and inexpensive piezoelectric vibrating gyro.

[0022]

In order to solve the above-mentioned problems, the present invention uses a piezoelectric vibrator having a strip-shaped electrode formed on the outer peripheral surface of a piezoelectric ceramic cylinder or pipe. In a piezoelectric vibrating gyro that performs driving and detection using bending vibration mode due to the effect,
The piezoelectric vibration is provided by a vibrator supporting member including an electrode for electrically connecting the electrode of the piezoelectric vibrator to the circuit board and a positioning pin for determining a mounting position of the piezoelectric vibrator on the circuit board. The child is fixed.

In order to solve the above-mentioned problems, the present invention uses the positioning pins of the vibrator supporting member electrically connected to each other at a position inside the circuit board to be used as an input / output terminal of a circuit. It will be configured.

Further, in order to solve the above-mentioned problems, the present invention has a structure in which a step for positioning the height of the circuit board is formed in a piezoelectric vibration gyro case for mounting the circuit board. And

Further, according to the present invention, in order to solve the above-mentioned problems, after inserting the circuit board on which the piezoelectric vibrator and the vibrator supporting member are mounted into the piezoelectric vibrating gyro case, the circuit board is mounted. The resin is sealed from the back side.

Further, according to the present invention, in order to solve the above-mentioned problems, the positioning pin of the vibrator supporting member has a length protruding from the piezoelectric vibrating gyro case, and the positioning pin has the length of the piezoelectric member. In the process from the assembly of the vibration gyro to the attachment of the piezoelectric vibration gyro to the system, it is configured to be consistently used as a positioning reference for the maximum sensitivity axis of the piezoelectric vibration gyro.

[0027]

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

However, with regard to the configuration and operation of the range that can be clearly recalled from the description of the present embodiment, their illustration and disclosure will be omitted or simplified in order to avoid complication of explanation.

FIG. 1 shows the structure of a vibrator supporting member 14 of a piezoelectric vibrating gyroscope according to an embodiment of the present invention.

This vibrator supporting member 14 is a vibrator connecting terminal for electrically connecting / fixing the lead wire 3 from each strip electrode 2 of the vibrator 1 configured as shown in FIG. 15 and the vibrator supporting member 14 to the circuit board 20.
It is composed of a positioning pin 16 as a positioning member for mounting on (FIG. 2) and a pedestal 17 for fixing the node of the vibrator 1.

Here, as shown in FIG. 1, the positioning pin 16 is arranged so as to be positioned inside the vibrator supporting member 14, and the length of the positioning pin 16 is
As shown in FIG. 4, when the circuit board 20 is inserted in the case 21 made of metal, the extension end of the positioning pin 16 has a length sufficient to extend to the outside of the metal case 21. is doing.

As shown in FIG. 4, the vibrator 1 is fixed to a base 17 of the vibrator supporting member 14 with a resin such as silicon rubber.

The lead wire 3 from the strip electrode 2 of the vibrator 1 is connected to the vibrator connecting terminal 1 of the vibrator supporting member 14.
5 are electrically connected to each other.

On the other hand, at the position corresponding to the positioning pin 16 of the vibrator supporting member 14 of the circuit board 20 in this embodiment, as shown in FIG. Drive / detection circuit 24 (see FIG. 4)
The reference input / output terminal is provided as a circuit input / output through-hole terminal 18 into which the positioning pin 16 is inserted.

The vibrator supporting member 14 on which the vibrator 1 is mounted as described above is, as shown in FIG.
After the positioning pin 16 is inserted into the circuit input / output through-hole terminal 18 to be positioned with respect to the circuit board 20, the positioning pin 16 and the circuit input / output through-hole terminal 18 are connected by soldering or the like. Then, it is fixed on the circuit board 20.

Then, after fixing the positioning pin 16 and the circuit input / output through-hole terminal 18, the vibrator supporting member 14 to which the lead wire 3 of the vibrator 1 is connected, the vibrator connecting terminals 15, and the circuit. Support member connection terminal 1 of substrate 20
When 9 is electrically connected, the vibrator 1 and the drive / detection circuit 24 are electrically connected.

In the case 21 of the piezoelectric vibrating gyroscope according to the embodiment of the present invention, as shown in FIGS.
When the circuit board 20 is fitted, the case 2 of the circuit board 20 on which the vibrator 1 and the vibrator support member 14 are mounted
A step 22 is formed for positioning the height at the time of mounting on 1.

As a result, the circuit board 20 on which the vibrator 1 and the vibrator supporting member 14 are mounted is, as shown in FIG.
Through hole terminal 18 for circuit input / output of this circuit board 20
After the positioning pin 16 connected to the case 21 is fitted into the step 22 formed in the case 21 without contacting the case 21 and the mounting position at the time of insertion into the case 21 is positioned, its rear surface is It is sealed with resin 23 from the side.

[0039]

According to the present invention, as described above, the positioning pin positions the vibrator supporting member with respect to the circuit board when the vibrator supporting member is attached to the circuit board. It is possible to accurately mount the vibrator on the circuit board, and prevent the occurrence of error output due to the deviation of the maximum sensitivity axis of the vibrator.

Further, according to the present invention, since the positioning pin of the vibrator supporting member is arranged at a position inside the circuit board, the circuit board and the circuit board when the circuit board is inserted into the metal case are disposed. Contact with the metal case can be avoided without the use of a case lid.

Further, according to the present invention, since the step for positioning the height of the circuit board is formed in the piezoelectric vibrating gyro case for mounting the circuit board, the mounting of the circuit board is performed. The height of time can be positioned without using the case lid.

Furthermore, according to the present invention, after the circuit board on which the piezoelectric vibrator and the vibrator supporting member are mounted is inserted into the metal case, the circuit board is sealed with resin from the back surface side. The case lid becomes unnecessary, the number of component parts and the manufacturing process can be reduced, and the size and cost can be reduced.

Further, according to the present invention, the positioning pin of the vibrator supporting member has a length protruding from the piezoelectric vibrating gyro case, and the positioning pin is formed from the piezoelectric vibrating gyro assembly to the piezoelectric vibrating gyro. In the process up to installation of the vibration gyro to the system, it is used consistently as a positioning reference for the maximum sensitivity axis of the piezoelectric vibration gyro, so when installing this piezoelectric vibration gyro to the system, the installation error of the component parts is accumulated. The mounting accuracy of the maximum sensitivity axis can be maintained with high accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view showing a structure of a vibrator supporting member of a piezoelectric vibrating gyroscope according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the structure of the circuit board of the piezoelectric vibrating gyroscope according to an embodiment of the present invention.

FIG. 3 is a perspective view of a case of a piezoelectric vibrating gyroscope according to an embodiment of the present invention.

FIG. 4 is a sectional view showing a structure after assembly of the piezoelectric vibrating gyroscope according to an embodiment of the present invention.

FIG. 5 is a perspective view of a vibrator for explaining the principle of a piezoelectric vibrating gyroscope using a vibrator made of a piezoelectric ceramic cylinder, which is the background of the present invention.

6 is a perspective view showing a structure of a conventional vibrator supporting member for fixing the vibrator shown in FIG. 5 and mounting it on a circuit board.

FIG. 7 is a perspective view showing a structure of a circuit board in a conventional piezoelectric vibrating gyro.

FIG. 8 is a cross-sectional view showing a structure after assembly of a conventional piezoelectric vibrating gyro.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 oscillator 2 strip electrode 3 lead wire 5 maximum sensitivity axis 14 oscillator support member 15 oscillator connection terminal 16 positioning pin 17 pedestal 18 circuit input / output through-hole terminal 19 support member connection terminal 20 circuit board 21 case 22 case Step 23 Resin 24 Drive / detection circuit

Claims (5)

[Claims] 1. A piezoelectric vibrating gyro which uses a piezoelectric vibrator having a strip-shaped electrode formed on the outer peripheral surface of a piezoelectric ceramic cylinder or a pipe, and which is driven and detected by utilizing a bending vibration mode due to the piezoelectric lateral effect of the piezoelectric vibrator. In the above, by a vibrator supporting member including an electrode for electrically connecting the electrode of the piezoelectric vibrator to a circuit board, and a positioning pin for determining a mounting position of the piezoelectric vibrator on the circuit board, A piezoelectric vibration gyro characterized by fixing a piezoelectric vibrator. 2. The positioning pin of the vibrator supporting member,
The piezoelectric vibrating gyro according to claim 1, wherein the piezoelectric vibrating gyro is electrically connected at a position inside the circuit board and used as an input / output terminal of a circuit. 3. The piezoelectric vibration gyro according to claim 2, wherein a step for positioning the height of the circuit board is formed in a case for the piezoelectric vibration gyro for mounting the circuit board. 4. A circuit board on which the piezoelectric vibrator and a vibrator supporting member are mounted is inserted into the piezoelectric vibrating gyro case, and then the circuit board is sealed with a resin from the back surface side. Item 3. A piezoelectric vibrating gyroscope according to item 3. 5. The positioning pin of the vibrator support member comprises:
The locating pin has a length protruding from the case for the piezoelectric vibration gyro, and the positioning pin has a maximum sensitivity axis of the piezoelectric vibration gyro in the steps from the assembly of the piezoelectric vibration gyro to the attachment of the piezoelectric vibration gyro to the system. The piezoelectric vibrating gyro according to claim 1, wherein the piezoelectric vibrating gyro is used consistently as a positioning reference.