JPH0843109A - Piezoelectric vibrating gyro oscillator - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a vibrator for a piezoelectric vibration gyro, in which the null voltage does not change with time. [Structure] The rod-shaped bending oscillator 1 is a nodal line 1 that serves as a node of vibration.
By using a one-component heat-curable silicone rubber adhesive that becomes a soft elastic body after being cured to adhere and support the support base 8 at 1, the change over time of the null voltage of the piezoelectric vibration gyro is made substantially zero.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a piezoelectric vibrator in a gyroscope used in a camera-integrated VTR to prevent camera shake and in a car navigation system.
The present invention relates to a so-called piezoelectric vibration gyro, and more particularly to a support and a vibrator for a rod-shaped bending vibrator of a vibrator for a piezoelectric vibration gyro.

[0002]

2. Description of the Related Art A piezoelectric vibrating gyro is a gyroscope that utilizes a mechanical phenomenon in which a Coriolis force is generated in a direction perpendicular to the vibrating direction when a rotating angular velocity is applied to a vibrating object. In a vibration system configured to be able to excite and detect in two directions that are orthogonal to each other, with the vibrator vibrating in one direction and excited, the vibrator itself is centered on an axis parallel to the line where the two vibrating planes intersect. When it is rotated as an axis, due to the action of the Coriolis force described above, a force acts in a direction perpendicular to this vibration, and the other vibration is excited. Since the magnitude of this vibration is proportional to the magnitude of the input side vibration and the rotational angular velocity, when the input voltage is constant, from the magnitude of the output voltage generated in the direction perpendicular to the vibration direction that is excited in advance, The magnitude of the rotational angular velocity can be calculated.

FIG. 1 is a schematic view showing the structure of a rod-shaped bending oscillator made of a piezoelectric ceramic used in a piezoelectric vibrating gyro of a conventional example and the present invention. FIG. 1 (a) is an external perspective view and FIG. (B) is a side view. Six rod-shaped bending oscillators (hereinafter referred to as “vibrator”) 1 made of piezoelectric ceramics are placed on the outer peripheral surface at positions that divide the circumference into six equal parts, parallel to the long axis direction of the rod-shaped bending oscillator, and six on the surface of the oscillator. Strip electrodes 2, 3,
4, 5, 6, 7 are formed. Every other strip-shaped electrode is connected to each other and subjected to polarization treatment as two terminals. After the polarization treatment, every other strip-shaped electrode 2, 4 and 6 is connected to form a common ground electrode, and the remaining strip-shaped electrodes are The strip electrode 3 is used as a drive electrode, the strip electrodes 5 and 7 are used as detection electrodes, and a lead wire is connected to a node of bending vibration to form a piezoelectric vibrating gyro as a lead wire. 2 is an external perspective view showing a structural example of a resin-molded support base 8 used for supporting and fixing the piezoelectric vibrators of the related art and the present invention shown in FIG. 1, and FIG. FIG. 4 is an external perspective view when a rod-shaped bending oscillator is incorporated in the support base 8 shown in FIG. 4, and FIG. 4 is a side view of the rod-shaped bending oscillator and the support base of FIG. 3 when viewed from one end face. As shown in FIG. 4, after curing from the through-hole 9, a silicone rubber 10 having a soft elastic body and having adhesiveness
Is injected and the vibrator 1 is supported and fixed to the support base 8 along a nodal line 11 shown by a broken line which is a node when the rod-shaped bending vibrator shown in FIG. 3 vibrates.

As a factor that constitutes a good piezoelectric vibrating gyro, it is necessary that the adhesive force between the rod-shaped bending oscillator and the supporting soft elastic body and the hardness of the supporting do not change after curing. In the conventional piezoelectric vibrating gyro, a hygroscopic silicone rubber (1 liquid curing type RTV) is used, and there is no problem with the adhesive strength, but it does not completely cure during fabrication and curing progresses after assembly as a vibrating gyro. Then, the hardness that supports the vibrator changes, and, for example, as shown in FIG. 6, when the output seismic intensity (null voltage) when the Coriolis force is zero is 6 cases (A to F), the number of days after bonding elapses. However, there is a drawback that the gyro characteristics are affected.

[0005]

DISCLOSURE OF THE INVENTION The present invention eliminates the above-mentioned drawback that the null voltage generated during the support of the conventional rod-shaped bending vibrator changes greatly after the bonding and the passage of time. It is therefore an object of the present invention to provide a vibrator for a piezoelectric vibration gyro, which prevents the null voltage of the piezoelectric vibration gyro from changing over time.

[0006]

[Means for Solving the Problems] A one-component thermosetting addition reaction type silicone rubber which becomes a soft elastic body after a node or line of vibration of a rod-shaped bending oscillator vibrating at one wavelength resonance is hardened. Supporting with an adhesive solves the above problem.

[0007]

[Function] A one-component heat-curable silicone rubber is used as the adhesive for the support portion of the rod-shaped bending vibrator used in the piezoelectric vibration gyro, to secure the curing of the adhesive when supporting and fixing it, and By suppressing the change, the change over time of the null voltage of the piezoelectric vibration gyro can be made almost zero.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. The structures of the rod-shaped bending vibrator 1 and the support base 8 of the embodiment of the present invention are the same as those of the conventional example as described above. FIG. 2 is an external perspective view showing a structural example of a resin-molded support base 8 used for supporting and fixing the rod-shaped bending vibrator 1 shown in FIG. 3 is an external perspective view of the rod-shaped bending oscillator incorporated in the support base 8, and FIG. 4 is a side view of the rod-shaped bending oscillator and the support base of FIG. 3 as viewed from one end face. . After curing from the through-hole 9, a one-component heat-curing addition reaction type silicone rubber 10 having adhesiveness of a soft elastic body is injected and heat-cured, and the vibrator 1 is supported and fixed to the support base 8. There is.

FIG. 5 shows an embodiment in which KEI1254, a silicone rubber manufactured by Shin-Etsu Chemical Co., Ltd., is used. In all of the six measurement samples (A to F), the change with time of the null voltage was almost zero.

In the present invention, except for the above examples, one-component heat-curable silicone rubber adhesive manufactured by Shin-Etsu Chemical Co., Ltd., KEI1840, and one-component heat-curable silicone rubber manufactured by Toshiba Silicone Co., Ltd. , TSE
Similar results are obtained with 325.

[0011]

As described above, according to the present invention,
It has been possible to provide a vibrator for a piezoelectric vibrating gyro, which prevents the null voltage of the piezoelectric vibrating gyro from changing over time.

[Brief description of drawings]

FIG. 1 is a diagram showing a rod-shaped bending oscillator used in a piezoelectric vibrating gyro. FIG. 1A is an external perspective view. FIG.1 (b) is sectional drawing.

FIG. 2 is an external perspective view of a support base that supports a rod-shaped bending oscillator.

FIG. 3 is an external perspective view when a rod-shaped bending oscillator is incorporated in the support shown in FIG.

FIG. 4 is a side view of the diagram shown in FIG.

FIG. 5 is a characteristic diagram showing a time-dependent change in null voltage when a one-component thermosetting silicone rubber is used as the silicone rubber for adhering the rod-shaped bending oscillator of the present invention to a support.

FIG. 6 is a characteristic diagram showing a change over time of a null voltage by a conventional adhesive silicone rubber.

[Explanation of symbols]

 1 Rod-shaped bending oscillator 2, 3, 4, 5, 6, 7 Band-shaped electrode 8 Support 9 (For silicone rubber injection) Through hole 10 (For adhesion) Silicone rubber 11 Node lines A, B, C, D, E, F Measurement sample

Claims (1)

[Claims] 1. A nodal line of vibration of a rod-shaped bending oscillator that vibrates at one wavelength resonance is supported by using a one-component thermosetting silicone rubber adhesive that becomes a soft elastic body after curing. Piezoelectric vibrator for gyro.