JPH0622919U - Piezoelectric vibration gyro - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a piezoelectric vibration gyro with little change in output voltage due to temperature change. [Structure] Piezoelectric ceramics 1 having two or more bending vibration nodes are provided with through holes 5 and 5 ', and metal rod members 4 and 4 loosely inserted into the through holes. Even when heated, the outer dimensions of the metal rod members 4 and 4 are smaller than the diameter dimensions of the through holes 5 and 5 '.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a piezoelectric vibrating gyroscope used for attitude control of equipment mounted on a moving body such as a ship and an automobile, and a navigation system of an automobile.

[0002]

[Prior art]

 Conventionally, as this type of piezoelectric vibrating gyro, the vibration nodes 3a and a'shown in FIG. 3 are supported by a silicon ring 3 fixed to a fixed block 2 as shown in FIG. 2 so as not to restrain flexural vibration. Things are being drafted.

[0003]

[Problems to be solved by the device]

 However, in the conventional piezoelectric vibrating gyroscope described above, the nodes are fixed on the entire circumference, and since the silicon ring is a material whose hardness changes with temperature changes, flexural vibration is constrained by the temperature changes and is generated. There is a drawback that the applied voltage changes (temperature drift).

Therefore, the technical problem of the present invention is to provide a piezoelectric vibration gyro in which the change of the output voltage due to the temperature change is small.

[0005]

[Means for Solving the Problems]

 According to the present invention, in a piezoelectric vibrating gyro having a piezoelectric ceramic having at least two bending vibration nodes, through holes formed in the two nodes and a fixing member loosely inserted into the through holes. A piezoelectric vibrating gyro is obtained which has a rod member for use.

Further, according to the present invention, in the piezoelectric vibrating gyro, there can be obtained the piezoelectric vibrating gyro, wherein the fixing rod member is made of a metal material.

Further, according to the present invention, in the piezoelectric vibrating gyroscope, an outer dimension of the fixing rod member is smaller than a diameter dimension of the through hole at a predetermined heating temperature. A piezoelectric vibrating gyro is obtained.

In other words, according to the present invention, a strip electrode of 2n (n is an integer of 3 or more) that evenly divides the circumference is provided on the outer peripheral surface of the piezoelectric ceramic cylinder in the length direction of the piezoelectric ceramic cylinder. The piezoelectric elements are provided in parallel, and the piezoelectric electrodes are provided in m (m is a natural number) strip electrode gaps at positions where the straight line connecting the center of one of the strip electrodes and the piezoelectric ceramic cylinder is the axis of symmetry. An AC voltage for excitation having a frequency approximately equal to the resonance frequency of the bending vibration mode of the ceramic cylinder is applied to cause the piezoelectric ceramic cylinder to bend and vibrate in the direction of the axis of symmetry, and at a symmetrical position about the axis of symmetry. In a piezoelectric vibrating gyroscope configured to detect a voltage generated in a gap between one or a plurality of strip-shaped electrodes, a through hole is provided at a bending vibration node of the piezoelectric ceramic cylinder. A piezoelectric vibration gyro characterized by being supported through is obtained.

The present invention is characterized in that a through hole is formed in a bending vibration node of a piezoelectric ceramic cylinder to support it through a metal rod, and the temperature drift is small.

[0010]

【Example】

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

FIG. 1 is a perspective view showing an embodiment of the present invention. A through hole 5 is provided at a node a of the bending vibration of the piezoelectric ceramic cylinder 1 perpendicularly to the axis of the cylinder. The metal rod 4 is passed through the through hole 5. Both ends of the metal rod 4 are fixed. Further, the bending vibration node a'is provided with a through hole 5'perpendicular to the through hole 5 of the node a. The metal rod 4 is passed through the through hole 5 '. Both ends of this metal rod 4 are fixed. The through holes 5 and 5'are made larger than the outer diameter of the metal rod 4 so that the metal rod 4 can pass through without difficulty. The diameters of the through holes 5 and 5'are made sufficiently larger than the maximum outer diameter of the metal rod 4 when the temperature changes, so that the bending vibration of the piezoelectric ceramic 1 is not restricted by the temperature change. I have to.

[0012]

[Effect of device]

 As described above, according to the present invention, it is possible to provide a piezoelectric vibration gyro with little change in generated voltage due to temperature change.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a conventional piezoelectric vibrating gyro.

FIG. 3 is a diagram showing nodes of flexural vibration in a conventional piezoelectric vibrating gyro.

[Explanation of symbols]

 1 Piezoelectric ceramic cylinder 4 Metal rod 5,5 'Through hole

Claims (3)

[Scope of utility model registration request] 1. A piezoelectric vibrating gyroscope comprising a piezoelectric ceramic having at least two bending vibration nodes, and through-holes formed at the two nodes and a fixing rod loosely inserted into the through-holes. A piezoelectric vibration gyro having a member. 2. The piezoelectric vibrating gyro according to claim 1, wherein the fixing rod member is made of a metal material. 3. The piezoelectric vibrating gyro according to claim 1, wherein an outer dimension of the fixing rod member is smaller than a diameter dimension of the through hole at a predetermined heating temperature.