JPS5937414A - Method for adjusting bias of vibration gyroscope - Google Patents

Abstract

PURPOSE:To adjust a vibration form of a vibrator, by cutting off a part of a piezoelectric element formed on a side face of the vibrator of vibration gyroscope. CONSTITUTION:Piezoelectric bodies 6, 8 are formed on the surface of a vibrator 1 of a vibration gyroscope. Crooked vibration of the vibrator 1 is performed by supplying an exciting signal to the piezoelectric body 6. The output signal of the piezoelectric element 8 for an output at the time of no input, is made to 0 by cutting off a part 5 of an electrode 2 of the piezoelectric element 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of adjusting a vibrator of a vibrating gyro.

The vibrator of a vibrating gyroscope, which causes bending vibration in the vibrator by vibrating a piezoelectric element such as a piezoelectric material and electrodes formed on the side surface of the vibrator, which has a rectangular cross section, has dimensional errors of the vibrator itself, and Due to many factors such as non-uniform thickness of the piezoelectric body formed, positional error of the electrodes, and support condition of the vibrator, the direction of vibration often deviates from the specified plane, requiring an adjustment process. As a method, as shown in FIG.
are provided so as to extend symmetrically with respect to the center line 3 in the length direction,
Additional circuit 7 that adjusts the magnitude of the excitation signal applied to each
was necessary. However, this method had the following drawbacks.

(1) The piezoelectric element formed on the same side is divided into two parts, and the lead wires 4 and 4' are taken out from each part, which requires complicated assembly and processing steps.

(2) Compared to a piezoelectric element in which the piezoelectric element is not divided into two parts, the size of the vibrator is larger, making it unsuitable for miniaturization.

(3) The circuit configuration becomes complicated because an additional circuit 7 is required to adjust the excitation signal applied to each of the divided piezoelectric elements.

The present invention was made with the aim of improving the above-mentioned drawbacks of the conventional method of adjusting a vibrator in a vibrating gyroscope. By cutting out a portion, the vibration form of the vibrator is modified without using the additional circuit 7, and the assembly process is further simplified.

Next, an embodiment of the bias adjustment method for a vibrating gyroscope according to the present invention will be described based on the drawings. FIG. 2 shows a piezoelectric element formed on one side of the vibrator 1. This piezoelectric element uses the vibrator 1 as one electrode, and this electrode and the piezoelectric body 6 formed on its surface are further connected to each other. The third electrode is sandwiched between the other electrode 2 formed on the top surface.
A side view thereof is shown in the figure. When an excitation signal is supplied to the electrode 2 of this piezoelectric element via the lead wire 4, the vibrator 1 performs bending vibration. Originally, the direction of vibration during unattended operation is the third direction.
The direction of vibration should be vertical in the figure, as shown by arrow N in Figure 3(b), but as explained earlier, the vibration direction often deviates due to various reasons.For example, arrow M in Figure 3(a) If the vibration direction is tilted as shown in the figure, this means that it includes a left-right component that should not be generated when there is no human power. An output signal is output from element 8. The adjustment method of the present invention is to remove a part of the excitation piezoelectric element, for example, part 5 of the electrode 2 little by little in such a case, so that the output signal during unattended operation approaches O. . In this embodiment, for the sake of clarity, a piezoelectric element on only one side is explained, but the procedure is exactly the same when a piezoelectric element is simultaneously formed on the opposite side and excited.

Although this invention is constructed as described above, as mentioned above, it is not possible to completely keep the mounting position of the piezoelectric element, the film thickness, the dimensions and support state of the vibrator within predetermined values. This is difficult, and it is realistic to adjust all at once in the adjustment process after assembly. Compared to the conventional method, the adjustment method of the present invention does not divide the excitation piezoelectric element into two, so there are fewer lead wires to take out, and the electric circuit is simpler and does not require additional circuits, resulting in smaller size and easier processing and assembly. The effect is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a vibrator with a piezoelectric element divided into two parts using the conventional bias adjustment method. FIG. 2 is a plan view of a vibrator having a piezoelectric element including a cutout portion according to the present invention. FIG. 3 is a side view of FIG. 2, with (a) showing before adjustment and (b) showing after adjustment. DESCRIPTION OF SYMBOLS 1... Vibrator, 2. 2'... Electrode, 3... Center line, 4°4'... Lead wire, 5... Electrode 2 to be removed
6... piezoelectric body, 7... additional circuit, 8...
Piezoelectric element for output. Agent Patent Attorney Ojibe Ogawa (5) Figure 1 Figure 2

Claims (1)

[Claims] In a method for adjusting the vibrator of a vibrating gyroscope that utilizes the bending vibration of a vibrator with a square cross section, the vibration form of the vibrator is adjusted by cutting out a part of the piezoelectric element formed on the side of the vibrator. A bias adjustment method for a vibrating gyro.