JP3505686B2 - Piezoelectric vibration gyro - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a camera-integrated V
The present invention relates to a gyroscope used for a camera shake prevention device of a TR, a navigation system of an automobile, and the like, and more specifically, to a piezoelectric vibration gyro having a rod-shaped bending vibration structure.

[0002]

2. Description of the Related Art Generally, a piezoelectric vibrating gyro belongs to a gyroscope which utilizes a mechanical phenomenon that a Coriolis force is generated in a direction perpendicular to a vibrating direction when a rotating angular velocity is applied to a vibrating object. In this gyroscope, in a vibrating system configured to be capable of exciting and detecting in two directions that are orthogonal to each other, in the state where one vibration is excited, the vibrator itself becomes a line where two vibrating surfaces intersect. When rotating about a parallel axis as a central axis, a force acts in a direction perpendicular to this vibration due to the action of the above-mentioned Coriolis force, and the other vibration is excited. Since the magnitude of this 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. 3A is a perspective view showing a piezoelectric vibrator used in a conventional piezoelectric vibrating gyro, and FIG. 3B is a developed view showing an electrode pattern of the piezoelectric vibrator. is there. This piezoelectric vibrator has six strip electrodes 2, 3, 4, 5 parallel to the length direction of the cylindrical piezoelectric ceramic 1 at positions where the circumference is divided into six equal parts on the outer peripheral surface of the cylindrical piezoelectric ceramic 1. , 6, 7 are provided.

The piezoelectric vibrator is subjected to a polarization treatment to form a two-terminal structure by connecting every other of these strip electrodes to each other, and then every other strip electrode 2, 4, 6
Both sides of the strip are connected for common ground, the strip electrode 3 of the remaining strip electrodes is used for driving, and the strip electrodes 5 and 7 are used for detection. Here, as shown in FIG. 3B, each strip-shaped electrode in the piezoelectric vibrator has a strip-shaped electrode 3 for driving, a strip-shaped electrode 5 for detection, and a strip-shaped electrode 5 for detection within an interval formed by the strip-shaped electrodes 2, 4, 6 for common ground. The strip-shaped electrode 7 is arranged.

FIG. 4 is a perspective view showing a piezoelectric vibrating gyro formed by mounting, supporting and fixing the piezoelectric vibrator. Here, the detection strip electrode 5 and the detection strip electrode 7
In consideration of the symmetry with, the piezoelectric vibrator is supported and fixed so that the driving strip electrode 3 is arranged directly below and the common ground strip electrode 6 is arranged directly above.

There are a total of four lead wires 14 used for constructing the piezoelectric vibrating gyro, one for driving, two for detecting, and one for common ground. Also, each lead wire 1
The solder portion 15 to which one end of 4 is connected is arranged on the strip electrode corresponding to each application and on the nodal line of the bending vibration of the piezoelectric vibrator. Regarding the solder portion 15 of the common ground lead wire, Due to the symmetry of the piezoelectric vibrator, it is arranged on the strip electrode 6 on the opposite side of the driving strip electrode 3. The piezoelectric vibrating gyro thus configured can obtain good gyro characteristics.

[0007]

In the case of the above-mentioned piezoelectric vibrator, the soldering position (solder portion) of the lead wire is arranged over the entire circumference of the side surface of the cylindrical piezoelectric ceramic, and the solder portion is arranged on the nodal line of bending vibration. Because of this structure, it is impossible to mount, support and fix the piezoelectric vibrator unless each lead wire is soldered to each strip electrode in advance (in other words, after supporting and fixing the piezoelectric vibrator, each strip electrode is fixed). However, it is not possible to solder each lead wire).

Also, when the piezoelectric vibrator is mounted and fixed after soldering the lead wires to the strip electrodes, disconnection of the lead wires and accompanying damage to the solder portion and the strip electrodes may occur. Careful handling is required so that it does not occur. Therefore, the conventional piezoelectric vibrating gyroscope has a drawback that the assembling work cannot be performed easily and the assembling work efficiency is poor. In short, due to such problems, it is difficult to obtain a piezoelectric vibrating gyro having good gyro characteristics at present.

The present invention has been made to solve the above problems, and its technical problem is to use a piezoelectric vibrating gyroscope capable of assembling easily and efficiently and with high stability, and guaranteeing basic performance. It is to provide a vibrator.

[0010]

According to the present invention, there is provided a vibrator for a piezoelectric vibrating gyroscope in which a plurality of strip electrodes parallel to the longitudinal direction of the cylindrical piezoelectric ceramic are provided on the outer peripheral surface of the cylindrical piezoelectric ceramic. In the piezoelectric vibration gyro used,
A connecting portion for taking out a lead wire for driving / detecting and grounding is extended in the outer peripheral surface without passing through the end face of the cylindrical piezoelectric ceramic and connected to the strip electrode, and the connecting portion is connected to the cylindrical piezoelectric body. A piezoelectric vibrating gyro is obtained which is formed in one half area of the outer peripheral surface of ceramics, and supports and fixes the other half of the outer peripheral surface where the connecting portion does not exist.

Further, according to the present invention, in the piezoelectric vibrating gyro oscillator described above, a piezoelectric vibrating gyro oscillator in which a connecting portion is positioned by a node of bending vibration of a cylindrical piezoelectric ceramic is obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a detailed description of the vibrator for a piezoelectric vibrating gyroscope according to the present invention with reference to the drawings.

FIG. 1A is a perspective view showing a piezoelectric vibrating gyroscope vibrator according to an embodiment of the present invention, and FIG. 1B is an exploded view showing an electrode pattern of the piezoelectric vibrator. It is a thing.

This piezoelectric vibrator also has six strip electrodes 8, 8 in parallel with the length direction of the cylindrical piezoelectric ceramic 1 at positions where the circumference is divided into six equal parts on the outer peripheral surface of the cylindrical piezoelectric ceramic 1. 10, 11, 12, and 13 are provided.

The piezoelectric vibrator performs a polarization process to form a two-terminal structure by connecting every other strip electrode to each other, and then, every other strip electrode 9, 11 ,.
One side of 13 is connected to be used as a common ground, and the strip electrode 8 of the remaining strip electrodes is used for driving,
Further, the strip electrode 10 and the strip electrode 12 are used for detection. Here, as shown in FIG. 1B, the strip electrodes of the piezoelectric vibrator are provided with the strip electrode 10 and the strip electrode 12 for detection within the interval formed by the strip electrodes 9, 11, 13 for common ground. , Earth strip electrode 9
The driving strip electrode 8 is arranged in the vicinity of.

In addition, in this piezoelectric vibrator, in the half region of the outer peripheral surface of the cylindrical piezoelectric ceramic 1 (here, about 1 /
The occupied area is about 3), and at the position on the nodal line of the bending vibration of the cylindrical piezoelectric ceramic 1, the driving strip electrode 8 of each strip electrode, the detection strip electrode 10, 12 and the ground strip electrode 11 are provided with connection portions 8a, 10a, 12a and 11a, respectively.

Each of these connecting portions 8a, 10a, 12a,
11a is present at the end of the lead-out electrode formed integrally with each strip-shaped electrode, and for connecting the drive lead wire, the detection lead wire, and the ground lead wire, which will be described later, by soldering (each lead wire). Is provided in order to connect to each strip electrode without extending through the end face of the cylindrical piezoelectric ceramic 1 and connected to each strip electrode. It is formed in the area. That is, each connecting portion 8a, 10
Reference characters a, 12a and 11a serve as lead electrode terminals for the respective lead wires.
The solder portion formed by soldering a, 12a, and 11a is arranged on the nodal line of the bending vibration of the piezoelectric vibrator.

FIG. 2 is a perspective view showing a piezoelectric vibrating gyro formed by mounting, supporting and fixing the piezoelectric vibrator. In order to configure the piezoelectric vibration gyro here as well,
A total of four lead wires are used, one for driving, two for detection, and one for common ground. Further, here, in consideration of the symmetry of the detection strip electrodes 10 and 12, the connection portions 10a and 12a are respectively drawn to the positions of the nodal lines, and the drive strip electrode 8 is arranged directly below the connection portion 8a. To the position of the nodal line on the top surface. Further, the ground strip electrode 11 is arranged so as to be right above, and the connecting portion 11a thereof is drawn out to the position of the nodal line.

In the case of this piezoelectric vibrator, a driving lead wire,
A connecting portion 8a of the driving strip electrode 8 for connecting the detecting lead wire and the grounding lead wire, a connecting portion 10a of the detecting strip electrode 10, a connecting portion 12a of the detecting strip electrode 12, and a ground. Each of the connecting portions 11a of the strip-shaped electrode 11 for use is about 1/3 of the outer peripheral surface of the cylindrical piezoelectric ceramic 1.
Since it is arranged in the area, if the side where each connection exists is the upper half and the lower half where each connection does not exist is the support fixing part, each lead wire is connected to each strip electrode in advance. Regardless of whether or not the piezoelectric vibrator is attached, supported and fixed.

When the lead wires are soldered to the respective connection parts and then the piezoelectric vibrator is mounted and supported and fixed, the respective connection parts and the respective lead wires are placed on the upper half of the cylindrical piezoelectric ceramic 1. Therefore, the breakage of the lead wire and the damage of the solder portion and each strip-shaped electrode accompanying the breakage of the lead wire basically do not occur. Therefore, the handling at the time of mounting, supporting and fixing the piezoelectric vibrator becomes easy.

In the embodiment, each connecting portion is set to about 1 of the outer peripheral surface of the cylindrical piezoelectric ceramic 1 in consideration of workability of assembly.
Although it is provided in the / 3 region, each connection portion is provided in one half region of the outer peripheral surface of the cylindrical piezoelectric ceramic so that each lead wire can be connected after mounting and supporting and fixing the piezoelectric vibrator. Just go. Therefore, the present invention is not limited to the examples.

[0022]

As described above, according to the present invention, a vibrator for a piezoelectric vibrating gyroscope in which a plurality of strip electrodes parallel to the longitudinal direction of the cylindrical piezoelectric ceramic are provided on the outer peripheral surface of the cylindrical piezoelectric ceramic. In a piezoelectric vibrating gyroscope using, a connecting portion for extracting a lead wire for driving / detecting and grounding is connected to the strip electrode by extending in the outer peripheral surface without passing through the end face of the cylindrical piezoelectric ceramics, Since the connecting portion is formed in one half region of the outer peripheral surface of the cylindrical piezoelectric ceramic, and the other half of the outer peripheral surface where the connecting portion does not exist is supported and fixed, each lead electrode is previously attached to each lead electrode. It becomes possible to easily attach, support and fix the piezoelectric vibrator and assemble the piezoelectric vibrator regardless of whether or not the wire is connected. Further, when mounting, supporting and fixing the piezoelectric vibrator, each connecting portion and each lead wire may be placed on the upper half of the cylindrical piezoelectric ceramics and the lower half may be supported and fixed. Basically, the solder portion and each strip-shaped electrode are not damaged, and variations in gyro characteristics due to attachment of lead wires can be suppressed to be small. Furthermore, since it is possible to attach the lead wire after supporting and fixing the piezoelectric vibrator, if a mass-producible lead attachment method such as wire bonding is adopted, the assembly workability when constructing the piezoelectric vibration gyro is greatly improved. As a result, a piezoelectric vibrating gyro with excellent characteristics can be easily obtained.

[Brief description of drawings]

FIG. 1A is a perspective view showing a piezoelectric vibrating gyroscope vibrator according to an embodiment of the present invention, and FIG. 1B is a development view showing an electrode pattern of the piezoelectric vibrator. .

FIG. 2 is a perspective view showing a piezoelectric vibrating gyro formed by mounting, supporting and fixing the piezoelectric vibrator shown in FIG.

FIG. 3A is a perspective view showing a conventional piezoelectric vibrating gyroscope vibrator, and FIG. 3B is a development view showing an electrode pattern of the piezoelectric vibrator.

FIG. 4 is a perspective view showing a piezoelectric vibrating gyroscope in which the piezoelectric vibrator shown in FIG. 3A is attached, supported and fixed.

[Explanation of symbols]

1 Cylindrical piezoelectric ceramics 2, 4, 6, 9, 11, 13 Common earth band electrode 3,8 Driving strip electrodes 5,7,10,12 Detection strip electrodes 8a, 10a, 11a, 12a connection part 14 lead wire 15 Solder part

Continued front page       (56) Reference JP-A-4-307322 (JP, A)                 JP 62-185117 (JP, A)                 59-40813 (JP, U)                 Actual development Sho 60-122818 (JP, U)                 Actual Kaihei 4-99020 (JP, U)

Claims (2)

(57) [Claims] 1. A piezoelectric vibrating gyro oscillator using a piezoelectric vibrating gyroscope, wherein a plurality of strip electrodes parallel to a length direction of the cylindrical piezoelectric ceramic are provided on an outer peripheral surface of the cylindrical piezoelectric ceramic.
In the dynamic gyro , a connecting portion for taking out a lead wire for driving / detecting and grounding is extended in the outer peripheral surface without passing through the end surface of the cylindrical piezoelectric ceramic and connected to the strip electrode, and the connecting portion is connected. The connecting portion is formed in one half of the outer peripheral surface of the cylindrical piezoelectric ceramic.
The other half of the outer peripheral surface that does not exist is supported and fixed.
Piezoelectric vibrating gyro to collect . 2. The piezoelectric vibration gyro according to claim 1 .
There are, pressure the connecting portion may be positioned by the nodes of the bending vibration of the cylindrical piezoelectric ceramic
Electro-vibration gyro .