JPH0523030U - Support for piezoelectric vibration gyro - Google Patents

Abstract

(57) [Abstract] [Purpose] It is an object of the present invention to provide a support tool for a piezoelectric gyro which can reduce the influence on the bending vibration on the side surface of the piezoelectric vibration gyro. The piezoelectric gyro support 3 is made of a rubber-like elastic insulating material, has a predetermined outer shape, and has a through hole having a diameter substantially equal to the outer diameter of the piezoelectric gyro, and the through hole has the above-mentioned structure. The bending vibration node of the piezoelectric gyro is positioned and supported.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a support for supporting a piezoelectric vibrating gyroscope used in a posture control of equipment mounted on a moving body such as a ship or an automobile and a navigation system of the automobile.

[0002]

[Prior Art]

 A piezoelectric vibrating gyro is a type of gyroscope that utilizes a mechanical phenomenon in which when a vibrating object is given a rotational angular velocity, a liliolica is generated in a direction perpendicular to the vibration direction. When a piezoelectric vibrator is rotated with a vibration in one direction excited by applying a voltage, a force acts in the direction perpendicular to this vibration due to the action of the above-mentioned Yuriorika, and a new vibration is applied to the piezoelectric vibrator. Is excited, and the output voltage can be obtained based on this new vibration. Since the magnitude of this new vibration is proportional to the magnitude of the pre-excited vibration and the rotation angular velocity of the vibrator, the magnitude of the rotation angular velocity is changed from the magnitude of the output voltage with the input voltage kept constant. Can be asked.

FIG. 6 is a schematic view of the structure of a conventional piezoelectric vibrating gyro. Piezoelectric ceramic thin plates 102 and 103 polarized in the thickness direction are formed on adjacent surfaces of a metal prism 101 having a square cross section. It is joined. The metal prism 101 can flexurally vibrate in two directions perpendicular to each other at substantially the same resonance frequency. When a voltage having a frequency equal to this resonance frequency is applied to the piezoelectric ceramic thin plate 102, the metal prism 101 bends and vibrates in a direction in which the surface to which the piezoelectric ceramic thin plate 102 is bonded becomes uneven. In this state, when the metal prism 101 is rotated about the longitudinal direction as an axis, due to the action of the Julioca, the metal prism 101 performs new flexural vibration in the direction in which the surface to which the piezoelectric ceramic thin plate 103 is bonded becomes uneven, and the piezoelectric ceramic thin plate 103. A voltage proportional to the rotational angular velocity is generated at.

In FIG. 6, in order to support the piezoelectric gyro, two two electrodes facing each other at a position of about 22.4% of the entire length from one end surface of the metal prism 101, that is, a node of vibration for the bending resonance vibration mode. Supporting wire rods 104 and 104 'each made of a metal wire are welded to the metal surface perpendicularly to the surface. Further, at a position where the total length is about 22.4% from the other end face, that is, at the position of a vibration node for the bending resonance vibration mode, the metal wire is orthogonal to the surface on which the metal wire is welded, and the other two metal surfaces are opposed to each other. The support wires 105, 105 'are welded perpendicularly to the surface. Thin metal wires are used for these support wires to minimize the influence on bending vibrations that are orthogonal to each other. As the piezoelectric vibrator, there is also known one in which strip-shaped electrodes are provided in the longitudinal direction at intervals on the peripheral surface of a piezoelectric ceramic cylinder. Similarly, a piezoelectric vibration vibrator using a piezoelectric ceramic pipe instead of the piezoelectric ceramic cylinder is also known.

[0005]

[Problems to be solved by the device]

 In the piezoelectric gyro shown in FIG. 6, the pair of support wires 104 and 104 'almost ideally support the nodes of vibration with respect to bending vibration in the direction perpendicular to the surface to which the piezoelectric ceramic thin plate 102 is joined. The other pair of support wires 105 and 105 'are distorted by the bending vibration. On the other hand, although the support lines 105 and 105 'ideally support flexural vibrations in the direction perpendicular to the above-mentioned direction, there is a problem that the support lines 104 and 104' have the same adverse effect.

In order to reduce the influence on the flexural vibration, it is necessary to make the diameter of the support wire as thin as possible. However, making the support wire fine deteriorates the vibration resistance and shock resistance of the vibrator itself. There was a problem.

On the other hand, when a piezoelectric gyro is constituted by the above-mentioned known piezoelectric ceramic cylinder and a piezoelectric vibrator having a strip-shaped electrode on the outer circumference of the pipe, a support for supporting the piezoelectric vibrator is required. It is possible to use a support wire as shown in FIG. 6 as this support tool. However, since the strip-shaped electrodes formed on the outer peripheral surfaces of the piezoelectric ceramic cylinder and the pipe are formed by screen printing or vapor deposition, if a supporting wire made of a thin metal wire is welded or soldered to support it. However, there is a drawback that vibration resistance and impact resistance are deteriorated. The object of the present invention is to eliminate the above-mentioned defects in the conventional method of supporting a piezoelectric vibrating gyro and reduce the influence on the flexural vibration on the side surface of the piezoelectric vibrating gyro. It is an object of the present invention to provide a supporting tool suitable for supporting a piezoelectric gyro using a piezoelectric vibrator having a strip electrode on the outer circumference.

[0008]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention provides a piezoelectric gyro that utilizes the piezoelectric lateral effect by applying strip-shaped electrodes in the longitudinal direction on the peripheral surface of a piezoelectric ceramic body having a circular cross section to prevent bending vibration. A support device for a piezoelectric gyro for supporting at a node, comprising a rubber-like insulating material, having a predetermined outer shape, and having a through hole having a diameter substantially equal to the outer diameter of the piezoelectric gyro. The feature is that the bending vibration nodes are positioned and supported. Further, one example of the structure of the support is characterized in that it is made of a thin plate of rubber-like elastic insulating material as a whole, and has the through hole at the center of the plate. Another example of the structure of the support is a ring made of a rubber-like elastic insulating material and having the through hole at the center, and the axial thickness at the inner diameter portion of the ring is smaller than the axial thickness at the outer diameter portion. It is characterized by being small.

[0009]

【Example】

 A first embodiment of the present invention will be described with reference to FIGS. In FIG. 1, the vibrator comprises a piezoelectric ceramic cylinder 1 and n strip electrodes 2 formed on the outer peripheral surface of the piezoelectric ceramic cylinder 1 in parallel with the longitudinal direction. The strip electrode 2 can be easily obtained by directly forming it by curved screen printing or by removing unnecessary portions of the electrode formed on the entire surface by plating or the like by photoetching. The piezoelectric ceramic cylinder 1 is polarized by using the strip electrode 2 to obtain a vibrator. The vibrator vibrates flexibly by applying an AC voltage between a pair of electrodes of the plurality of strip electrodes 2. When the piezoelectric ceramic cylinder 1 is rotated about the axis of the cylinder in the above-mentioned vibration state, Yuri Lorica is generated in the direction perpendicular to the vibration direction, and new vibration is vibrated, so that a voltage is applied between the electrodes in that direction. Occur. The direction of vibration is determined by which electrode the voltage is applied to.

In FIG. 1A, the piezoelectric gyro support 3 is a thin ring made of rubber-like elasticity. In the cross section of this thin ring, as shown in FIG. 2B, the axial thickness at the inner diameter portion 5 of the ring is smaller than the axial thickness at the outer diameter portion. The cross section of the thin ring may have the shape shown in FIGS. 2 (c) to 2 (d). The piezoelectric gyro support 3 shown in FIGS. 2A and 2B is attached to and supports the vibrator of FIG. As shown in FIG. 3, two thin rings 3 and 4 are used, and the inner diameters of the rings are bonded to the surface of the piezoelectric ceramic cylinder at the vibration nodes of the vibrator.

A second embodiment will be described with reference to FIGS. 4 and 5. In FIG. 4, the piezoelectric gyro support 6 is a thin sheet having a through hole in the center thereof. As shown in FIG. 5, the vibrator shown in FIG. 1 is supported by using two pieces of the piezoelectric gyro support 6 shown in FIG. The inner wall of the through hole 8 is in contact with the position of the node of the bending vibration of the vibrator in each of the support tools 6 and 7.

The support shown in FIGS. 2A and 4 is made of a relatively soft elastic material such as rubber, felt, and spot, and can reduce external influence on vibration.

[0013]

The support according to the present invention has a through hole wall, and the vibrator is inserted into the through hole wall. That is, since the whole circumference including the nodes of vibration is supported, the influence on the bending vibration in the two orthogonal directions is small, and the influence on the vibrations in the orthogonal directions is substantially the same. Further, since the support is made of a relatively soft rubber-like insulating material, it is possible to reduce external influences on vibration. In addition, the cross section of the thin ring has an axial thickness at the inner diameter of the ring that is smaller than the axial thickness at the outer diameter. Can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of a piezoelectric ceramic cylinder used in a piezoelectric gyro of the present invention.

2 (a) is a perspective view showing the structure of a support for a piezoelectric vibrating gyroscope of the present invention, FIG. 2 (b) is a sectional view of the support shown in FIG. 2 (a), FIG. (C) And (d) is a figure which shows the cross-sectional shape from which the support of FIG. 2 (a) differs.

FIG. 3 is a perspective view showing an example of the structure of a piezoelectric vibrating gyro configured using the piezoelectric vibrating gyro support of the present invention.

FIG. 4 is a perspective view showing the structure of another piezoelectric vibrating gyro support according to the present invention.

FIG. 5 is a structural example of a piezoelectric vibrating gyro configured by using another piezoelectric vibrating gyro support according to the present invention.

FIG. 6 is a schematic view of the structure of a conventional piezoelectric vibrating gyro.

FIG. 7 is an explanatory diagram of a conventional piezoelectric vibration gyro support method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piezoelectric ceramic cylinder 2 Band electrode 3, 4, 6, 7 Support device for piezoelectric vibrating gyroscope of the present invention 5,8 Thin ring inner diameter 101 Metal prism 102, 103 Piezoelectric ceramic thin plate 104, 104 ', 105, 105' Metal supporting wire

Claims (3)

[Scope of utility model registration request] 1. A piezoelectric gyro for supporting a piezoelectric gyro using a piezoelectric lateral effect at a node of flexural vibration by providing strip-shaped electrodes in a longitudinal direction on a peripheral surface of a piezoelectric ceramic body having a circular cross section. The support member is made of a rubber-like elastic insulating material, has a predetermined outer shape, and has a through hole having a diameter substantially equal to the outer diameter of the piezoelectric gyro, and the bending vibration node of the piezoelectric gyro is provided in the through hole. Support for piezoelectric gyro that positions and supports. 2. The support for a piezoelectric gyro according to claim 1, wherein the plate is made of a thin rubber-like elastic insulating material as a whole and has the through hole in the center of the plate. 3. A ring made of a rubber-like elastic insulating material and having the through hole in the center thereof, wherein an axial thickness of an inner diameter portion of the ring is smaller than an axial thickness of an outer diameter portion thereof. The support for a piezoelectric gyro according to claim 1, which is characterized in that.