JPH06160101A - Vibration gyroscope - Google Patents

Abstract

PURPOSE:To provide a vibration gyroscope in which vibration of a base and a case as well as leakage of a sound wave can be' prevented. CONSTITUTION:A vibrator 12 comprises a vibration body 14 of, for example, an equilateral triangle pole shape and piezoelectric elements 16a, 16b, 16c. Support members 24, 26 for supporting the vibration body 14 are fitted to a base table 28, which is fitted to a base 30. A case 34 is fitted into a step difference part 32 of the base 30 and a vibration damping tape 38 is bonded to an external circumferential side of a connection part between the base 30 and the case 34. The vibration damping tape 38 is formed of a flexible material and absorbs vibration of the base 30 and the case 34. Terminals 36 are formed under the base 30 and piezoelectric elements 16a-16c are connected to the terminals 36.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration gyro,
Particularly, for example, the present invention relates to a vibration gyro in which a vibrator is enclosed in a case.

[0002]

2. Description of the Related Art FIG. 5 is an illustrative view showing an example of a conventional vibrating gyro which is the background of the present invention. Vibrating gyro 1
Includes the oscillator 2. The vibrator 2 is, for example, a piezoelectric element 4 formed on three side surfaces of a vibrator 3 having a regular triangular prism shape. The vibrating body 3 is supported by the supporting member 5 near its node point. The support member 5 is attached to the base 6,
The vibrator 2 is supported on the base 6. The base 6 is mounted on the base 7, and the case 8 is placed on the base 7 so as to cover the vibrator 2. Terminal 9 on base 7
Is formed, and the piezoelectric element 4 is connected to this terminal 9.

In this vibrating gyro 1, the vibrating body 3 is flexibly vibrated by connecting an exciting circuit to the piezoelectric element 4. When rotating about the axis of the vibrating body 3 in this state, the direction of the bending vibration of the vibrating body 3 changes due to the Coriolis force. The rotational angular velocity can be measured by detecting this change in bending vibration as the output voltage of the piezoelectric element 4.

[0004]

However, in such a vibrating gyro, the vibration of the vibrating body may leak and the vibration may be transmitted to the base and the case. Thus, when the base and the case vibrate, they interfere with the vibrating body, making it difficult to accurately measure the rotational angular velocity. Further, when the base and the case vibrate, sound waves easily leak from the gap between the base and the case. When another vibrating body exists in the vicinity of the vibrating gyro, interference between the vibrator of the vibrating gyro and the other vibrating body is likely to occur due to leakage of sound waves. Even in such a case, it becomes difficult to accurately measure the rotational angular velocity, which affects other vibrating bodies.

Therefore, a main object of the present invention is to provide a vibrating gyro which can prevent vibration of the base and the case and leakage of sound waves.

[0006]

The present invention provides a vibrator,
A vibration gyro including a base for supporting the vibrator, a case mounted on the base for covering the vibrator, and a damping material for closing a gap between the base and the case and suppressing vibration. Is.

[0007]

The vibration damping material absorbs and damps the vibration of the base and the case.

[0008]

According to the present invention, the vibration of the base and the case is absorbed and damped by the damping material, so that the interference with the vibrating body is unlikely to occur. Further, by absorbing and damping the vibrations of the base and the case, it is possible to prevent sound waves from leaking from these gaps. Therefore, it is possible to prevent interference between the vibrator of this vibrating gyroscope and another vibrating body. Therefore, if this vibrating gyro is used, the influence of vibration leakage and sound wave leakage such as interference is small, and the rotational angular velocity can be accurately measured. In addition, the influence on other vibrating bodies can be reduced.

The above-mentioned objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of the embodiments with reference to the drawings.

[0010]

1A is an exploded perspective view showing an embodiment of the present invention, and FIG. 1B is a sectional view thereof. The vibrating gyro 10 includes a vibrator 12. The vibrator 12 includes, for example, a vibrating body 14 having a regular triangular prism shape. The vibrating body 14 is formed of a material that generally causes mechanical vibration, such as elinvar, iron-nickel alloy, quartz, glass, crystal, or ceramic.

Piezoelectric elements 16a, 16b, 16c are formed in the central portions of the three side surfaces of the vibrating body 14, respectively.
The piezoelectric element 16a is, for example, a piezoelectric layer 18a made of porcelain.
The electrodes 20a and 22a are formed on both surfaces of the piezoelectric layer 18a. Then, one electrode 20a is adhered to the vibrating body 14 with, for example, a conductive adhesive. Similarly, the piezoelectric elements 16b and 16c have piezoelectric layers 18b and 18c, respectively.
including. Then, the electrodes 20b, 2 are formed on both surfaces of the piezoelectric layer 18b.
2b is formed, and electrodes 20c, 2 are formed on both surfaces of the piezoelectric layer 18c.
2c is formed. One electrodes 20b and 20c of these piezoelectric elements 16b and 16c are bonded to the vibrating body 14.

The vibrating body 14 is supported near the node points by supporting members 24 and 26 made of, for example, metal wires. The support members 24 and 26 are welded, for example, to
The vibrating body 14 is fixed to the ridge portion near the node point. The support members 24 and 26 are attached to the base 28. Therefore, the vibrator 12 is supported on the base 28.

The base 28 is mounted on a base 30. The base 30 is formed in a rectangular plate shape, and a step portion 32 is formed around it. Further, a case 34 is placed on the base 30. The case 34 is, for example, the base 3
It is attached to the base 30 by fitting it into the zero step portion 32. Therefore, the oscillator 12 has the base 3
0 and the case 34 block the outside world. Further, the base 30 is formed with a plurality of terminals 36 extending downward. This terminal 36 and the piezoelectric elements 16a, 16b, 1
6c is connected. Therefore, through the terminal 36,
Signals are input to and output from the piezoelectric elements 16a, 16b, 16c.

A damping tape 38 as a damping material is adhered to the outer peripheral side of the joint between the base 30 and the case 34.
The damping tape 38 is made of a flexible material. Therefore, the vibration damping tape 38 absorbs the vibration of the base 30 and the case 34.

In this vibrating gyro 10, an exciting circuit is connected between the piezoelectric elements 16a and 16b and the piezoelectric element 16c, for example. The vibrating body 14 is
Flexural vibration occurs in a direction orthogonal to the surface on which the piezoelectric element 16c is formed.
In this state, when rotating around the axis of the vibrating body 14,
The direction of flexural vibration changes due to the Coriolis force. As a result, a difference occurs in the voltage generated between the piezoelectric elements 16a and 16b, and the rotational angular velocity can be detected by measuring the difference between the output voltages of these piezoelectric elements 16a and 16b.

In the vibrating gyro 10, even if the vibration of the vibrating body 14 is transmitted to the base 30 and the case 34, it is absorbed and damped by the damping tape 38. Therefore, the interference due to the vibration of the base 30 and the case 34 can be prevented, and the angular velocity of rotation can be accurately detected. Also,
Since the vibration of the base 30 and the case 34 is suppressed, it is possible to suppress sound waves leaking from these gaps. Therefore, even if another vibrating body or the like exists in the vicinity of the vibrating gyro 10, interference between the vibrator 12 and the other vibrating body is unlikely to occur due to sound wave leakage. Therefore, by using the vibrating gyro 10, the rotational angular velocity can be accurately detected. Further, it is possible to reduce the influence of sound wave leakage on other vibrators.

Further, as shown in FIG. 2, a groove 40 may be formed along the outer periphery of the base 30 and the case 34 may be fitted into the groove 40. In this case, the groove 40 is filled with, for example, a flexible adhesive 42 as a damping material.
Even in this vibrating gyro 10, the base 30 and the case 3 are also included.
The vibration of No. 4 can be suppressed and the leakage of sound waves can be prevented.

Further, as shown in FIG. 3, the entire base 30 may be fitted in the case 34 and the lower surface of the base 30 may be filled with a flexible adhesive 42. Further, as shown in FIG. 4, a tape 44 having a vibration damping effect may be sandwiched between the base 30 and the case 34 to fix the base 30 and the case 34 together. That is, by blocking the space between the base 30 and the case 34 with a material having a vibration damping effect, the vibration of the base 30 and the case 34 is suppressed, and the leakage of sound waves generated from the gap between the base 30 and the case 34 is prevented. be able to.

Although the vibrating body having a regular triangular prism shape is used in the above-described embodiment, the vibrating body may have another prismatic shape such as a quadrangular prism shape, or a cylindrical vibrating body is used. May be. Further, as the number of piezoelectric elements, for example, only two piezoelectric elements may be formed and used for both driving and rotational angular velocity detection. In this way, the number of piezoelectric elements can be adjusted as needed.

[Brief description of drawings]

FIG. 1A is an exploded perspective view showing an embodiment of the present invention, and FIG. 1B is a sectional view thereof.

FIG. 2 is a sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view showing still another embodiment of the present invention.

FIG. 4 is a sectional view showing another embodiment of the present invention.

FIG. 5 is an illustrative view showing one example of a conventional vibrating gyro that is the background of the present invention.

[Explanation of symbols]

 10 Vibration Gyro 12 Vibrator 14 Vibrating Body 30 Base 34 Case 38 Damping Tape 42 Adhesive 44 Tape

Claims (1)

[Claims] 1. A vibrator, a base for supporting the vibrator, a case placed on the base to cover the vibrator, and a gap between the base and the case is closed to suppress vibration. Vibration gyro, including damping material for