JPH07159183A - Piezoelectric vibrating gyro oscillator - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a piezoelectric vibrating gyroscope that eliminates the adverse effects on the characteristics caused by the play of lead wires for driving or detection. [Structure] Input / output lead wires 3 and 31 soldered to a driving or detecting strip electrode 2 are soldered to a thin plate electrode 12 fixed to a holder 14, and a silicon rubber injection recess 13 of a holder 14 is filled with a silicone rubber. Inject 10,
The entire input / output lead wires 3 and 31 are covered with the silicone rubber 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called piezoelectric vibrating gyro using ultrasonic vibration of a piezoelectric vibrator, among gyroscopes used for camera shake prevention of camera-integrated VTRs and navigation systems of automobiles. In particular, it relates to a support for a rod-shaped bending oscillator and an oscillator.

[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 orthogonal to each other, with one vibration being excited, the vibrator itself is centered on an axis parallel to the line where the two vibrating planes intersect. When rotated, a force acts in a direction perpendicular to this vibration due to the action of the Coriolis force described above, and the other vibration is excited. Since the magnitude of the other vibration is proportional to the magnitude of the vibration on the input side and the rotation angular velocity, the magnitude of the rotation angular velocity can be obtained from the magnitude of the output voltage when the input voltage is constant.

FIG. 2 is a view showing a schematic structure of a vibrator for a piezoelectric vibration gyro, which is the main body of the piezoelectric vibration gyro, in which several strip electrodes 2 parallel to the longitudinal direction of the outer peripheral side surface of the cylindrical piezoelectric ceramic 1 are formed. 2 shows a cylindrical vibrating element for piezoelectric vibrating gyroscope. On a line (hereinafter, abbreviated as a nodal line) 5 that connects the nodes of the bending vibration at the position of 22.4% from both ends in the longitudinal direction of the vibrator along the circumferential direction of the cylinder,
In addition, the lead wire 3 for input / output is provided at the widthwise center of each strip electrode.
Are fixed at the soldering points 4, and polarization treatment is performed using the strip electrodes 2.

FIG. 3 is a view showing a state in which the piezoelectric vibrating gyro oscillator is supported by a supporting member 6, and in this state, the strip-shaped electrode 2 is used to bend the cylindrical piezoelectric ceramic 1 by the piezoelectric effect. Driving and detection are performed using the vibration mode.

FIG. 4 is a perspective view of the support 6. Also, FIG.
FIG. 6 is a diagram showing a configuration of a conventional piezoelectric vibrating gyroscope using the vibrator for piezoelectric vibrating gyroscope, (a) is a diagram of the piezoelectric vibrating gyro viewed from above, and (b) is a piezoelectric vibrating gyroscope. It is a figure which shows the cross section seen from the axial direction. The piezoelectric vibrating gyroscope support 6 is an annular body made of an insulative rubber-like elastic material having a through hole 7 having a diameter slightly smaller than the outer diameter of the cylindrical piezoelectric ceramic 1 in the center. The holder 9 having the same diameter as the outer diameter is fitted into the through hole 8 and bonded. The vibrator is inserted into the through hole 7 of the support tool 6 which is fitted and adhered to the holder 9, and the nodal line 5 of the bending vibration of the cylindrical piezoelectric ceramic 1 is formed at the edge of the through hole 7 of the support tool 6. The support is supported, and the silicone rubber 10 is injected and adhered to the portion where the annular support 6 and the vibrator are in contact with each other.
Next, the input / output lead wire 3 connected to the drive or detection electrode is soldered to the metal terminal rod 11. In the conventional piezoelectric vibration gyro shown in FIG. 5, the input / output lead wires 3 and 31 exposed to the outside from the supporting silicone rubber are shaken or the weight of the lead wire itself is increased when the vibrator is assembled. The change in the lead-out shape of the lead wire due to the temperature was the main cause of variations in characteristics. Further, there is a defect that the lead wire is easily broken after the vibrator is assembled.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the adverse effect of the lead wire for driving or detecting in the conventional bending vibrator described above, which is caused by the unfixed play portion. To provide a child.

[0007]

According to the present invention, a vibration node of a rod-shaped bending oscillator having electrodes for driving and detecting and vibrating at one wavelength resonance, or a nodal line connecting the bending vibration nodes, A piezoelectric vibrating gyroscope is obtained in which a lead wire connected to an electrode for driving or detecting is adhesively fixed to a support using a soft elastic body to eliminate a play portion where the lead wire is not fixed. To be

[0008]

[Function] If the lead wire for driving or detecting is not completely fixed, the characteristics may easily vary due to the change of the runout shape and the shape of the lead wire. The soldering point with the thin plate electrode is shortly connected, covered with an insulating resin, and fixed by adhesion.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the configuration of a piezoelectric vibrating gyroscope using the piezoelectric vibrating gyroscope of the present invention.
FIG. 1A is a top view of the piezoelectric vibrating gyro, and FIG. 1B is a view showing a cross section as seen from the axial direction of the piezoelectric vibrating gyro.

The piezoelectric vibrating gyro support 6 is an annular body made of an insulating rubber-like elastic material having a through hole 7 having a diameter slightly smaller than the outer diameter of the cylindrical piezoelectric ceramics 1 in the center thereof. The support 14 is fitted into the through hole 8 of the holder 14 having the same outer diameter as that of the support 6, and is bonded.

A vibrator is inserted into the holder 14 via a support 6, and the columnar piezoelectric ceramic 1 is supported at the edge of the through hole 7 of the support 6 by the nodal line 5 of flexural vibration to drive or detect. Input / output lead wires 3 and 31 connected to the electrodes for soldering are soldered to the thin plate electrode 12. Thin plate electrode 12
Is fixed to the holder 14 and soldered to the metal terminal rod 11. Silicone rubber 10 is injected into the contact portion between the annular support and the vibrator and the silicone rubber injection concave portion 13 of the holder to cover and fix a part of the thin plate electrode 12, the entire input / output lead wires 3 and 31, and the solder point 4. is doing.

[0012]

As described above, according to the present invention,
In the piezoelectric vibrating gyro, the lead wires for driving and outputting are embedded in the supporting silicone rubber during and after the assembling of the vibrator. As a result, there are no defects such as a change in the lead-out shape of the lead wire due to the touch of the lead wire or the weight of the lead wire itself. Further, the breakage of the lead wire at the time of assembling the vibrator is improved, and the piezoelectric vibrating gyro having a good yield and a small variation in characteristics can be manufactured.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a support structure of the present invention, and FIG.
1A is a view seen from above, and FIG. 1B is a view seen from the axial direction of the piezoelectric vibrator.

FIG. 2 is a perspective view of a piezoelectric vibrator used in a piezoelectric vibrating gyro.

3 is a perspective view of a piezoelectric vibration gyro in which the piezoelectric vibrator of FIG. 2 is supported by a support tool.

FIG. 4 is an enlarged perspective view of the support shown in FIG.

FIG. 5 is an explanatory view showing a conventional supporting structure, and FIG.
Is a view seen from above, and FIG. 5B is a view seen from the axial direction of the piezoelectric vibrator.

[Explanation of symbols]

 1 Cylindrical Piezoelectric Ceramics 2 Strip Electrodes 3,31 Input / Output Lead Wires 4 Solder Points 5 Nodal Lines 6 (for Piezoelectric Vibration Gyro) Support 7 (Support) Through Hole 8 (Holder) Through Hole 9 Holder (Conventional Example) 10 Silicone Rubber (for Adhesion) 11 Metal Terminal Rod 12 Thin Plate Electrode 13 Silicone Rubber Injection Recess 14 Holder (This Invention)

Claims (1)

[Claims] 1. A bonding tool to which a whole lead wire connected to an electrode for driving and detecting is embedded in a soft elastic body at a node or a node line of vibration of a rod-shaped bending oscillator vibrating at one wavelength resonance. A vibrator for a piezoelectric vibrating gyro, which is fixed.