JPH05133753A - Vibrator - Google Patents

Abstract

PURPOSE:To facilitate adjustment of resonance frequency by furnishing a ridge extending in the longitudinal direction of a vibrator in the middle across the width of the side face of vibrator having a quadriangular cross-section. CONSTITUTION:Piezo elements 2a, 2b are affixed to adjoining two side faces 6a, 6b of a vibrator 6 having a quadriangular cross-section. On the other side faces 6c, 6d confronting the side faces 6a, 6b, a ridge 8a pinched by grooves 7a, 7b and a ridge 8b pinched by grooves 7c, 7d are provided approx. in the middle across the width of these side faces 6c, 6d in such a way as extending in the longitudinal direction of the vibrator 6. If therein the resonance frequency in the direction perpendicular to the side face 6a exceeds a specified value, the ridge 8a is cut low from the crest gradually, and thereby the resonance frequency is reduced. The resonance frequency in the direction perpendicular to the side face 6b, on the other hand, can be adjusted by cutting low the ridge 8b. Thus the adjustability for the resonance frequency is easily obtained only through machining of ridges.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibrator used in a vibration gyro or the like, and more particularly to a vibrator structure which makes it possible to properly adjust the resonance frequency properly.

[0002]

2. Description of the Related Art For example, on two side faces 1a, 1b adjacent to each other of a vibrating body 1 having a rectangular prism shape as shown in FIG. 3 (a),
As shown in FIG. 3 (b), when two piezoelectric elements 2a and 2b are attached to form the vibrator 3, each piezoelectric element 2a,
The vibrator 3 can be caused to perform self-excited vibration by applying an oscillating AC voltage to 2b and by feeding back the output voltages of the piezoelectric elements 2a and 2b to a driving means (not shown). The vibrator 3 determines the angular velocity when the vibrator 3 is rotated about the axis of the vibrating body, in each of the piezoelectric elements 2a,
It is used as a vibration gyro by detecting the difference in the output voltage of 2b.

By the way, in such a vibrator 3, in general, a difference in processing size of the vibrating body 1, non-uniformity of the vibrating body structure,
Due to the sticking accuracy of the piezoelectric element, the imbalance in supporting the vibrator, etc.
In many cases, a difference occurs in the resonance frequency of each vibration with respect to the bending vibration in the direction orthogonal to 1b, and as a result, a difference in sensitivity occurs between the piezoelectric elements 2a and 2b.
Therefore, conventionally, for example, when the resonance frequency of bending vibration in the direction orthogonal to the side surface 1a is high, the side surface 1a or the side surface 1a that opposes the side surface 1a as shown in FIG. 3 (b).
By reducing c as necessary, the resonance frequency is reduced to a predetermined value.

[0004]

However, in such a conventional technique, it is significant that the side surface is scraped off so that the original plane and the plane after the scraping are exactly parallel to each other. It is difficult, and in many cases, the over-cut portion 1d as shown in FIG.
Even if the resonance frequency for the bending vibration in the direction orthogonal to is adjustable, there is a problem in that the resonance frequency is modulated in a direction other than that direction, for example, in the diagonal direction of the vibrating body 1.
The present invention has been made as a result of studying as a problem to solve such problems of the prior art, and an object of the present invention is to provide a vibrator capable of extremely easily adjusting a resonance frequency appropriately. To provide.

[0005]

According to the vibrator of the present invention, a protrusion extending in the longitudinal direction of the vibrating body is formed at a substantially central portion of the side surface of the vibrating body whose cross-sectional shape is, for example, a square. Articles are provided.

[0006]

With this vibrator, the resonance frequency of the flexural vibration can be adjusted by cutting the ridges provided on the side surface of the vibrating body. Since it is not necessary to add, it is possible to almost completely prevent the modulation of the resonance frequency in other vibration directions due to excessive cutting of a specific portion.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of the present invention.
This is because the piezoelectric elements 2a, 2b are attached to two mutually adjacent side surfaces 6a, 6b of the vibrating body 6 having a quadrangular cross-sectional shape, and the piezoelectric elements 2a, 2b are opposed to the respective side surfaces 6a, 6b. Grooves are formed on the side surfaces 6c and 6d, in the approximately central portion in the width direction thereof.
The vibrator 3 is configured by providing the ridges 8a sandwiched between the 7a and 7b and the ridges 8b sandwiched between the grooves 7c and 7d so as to extend in the longitudinal direction of the vibrating body 6, respectively. It is a thing.

In the drawing, the cross-sectional shape of each groove 7a, 7b, 7c, 7d and the cross-sectional shape of each ridge 8a, 8b are substantially V-shaped and almost inverted V-shaped, respectively. However, as each of the cross-sectional shapes, an arc shape, a V shape, a U shape, or the like can be appropriately selected. Moreover, the peak heights of the ridges 8a and 8b do not necessarily have to be at the same level as the side faces 6c and 6d.
In relation to the cutting amount of 8a and 8b, it is possible to make it lower or higher than the side surface level.

In the self-excited flexural vibration of the vibrator 3 constructed as described above, for example, when the resonance frequency in the direction orthogonal to the side surface 6a is higher than a predetermined value, the ridge 8a is cut from the top of the ridge 8a, for example. By gradually scraping off as shown by the broken line 8c in FIG. 1 (b), the resonance frequency can be easily and easily set to a predetermined value. On the other hand,
When the resonance frequency in the direction orthogonal to the side surface 6b is higher than a predetermined value, the desired resonance frequency can be obtained by cutting the ridges 8b in the same manner. Thus, with this oscillator, the resonance frequency can be adjusted as required without removing any parts other than the ridges, so that it is possible to modulate the resonance frequency in other vibration directions due to excessive cutting of unnecessary parts. Can be prevented very effectively.

FIG. 2 is a view showing another embodiment. In this example, the vibrating body 9 having a quadrangular cross section is opposed to the sticking side surfaces 9a, 9b of the respective piezoelectric elements 2a, 2b. On each of the side surfaces 9c, 9d, protrusions 10a, 10b extending in the longitudinal direction of the vibrating body 9 are provided so as to protrude from the respective side surfaces 9c, 9d at approximately the center in the width direction thereof. . According to this example, the ridges 10a, 10b can be directly formed without providing the grooves 7a, 7b, 7c, 7d of the above-described embodiment. Also in such a vibrator 3, the resonance frequency can be adjusted by gradually scraping off the protrusions 10a and 10b as in the above-mentioned example. Although the present invention has been described above based on the illustrated example, the ridges can be formed only on the side surfaces of the piezoelectric element that are attached, or can be formed on all side surfaces of the vibrating body.

[0011]

Therefore, according to the present invention, by providing the ridges for adjusting the resonance frequency on the side surface of the vibrating body, the resonance frequency can be easily and easily reduced without cutting other portions on the side surface of the vibrating body. Since the adjustment can be performed easily and always properly, it is possible to almost completely prevent the modulation of the resonance frequency in other vibration directions due to the uneven cutting of the side surface of the vibrating body.

[Brief description of drawings]

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

FIG. 2 is a diagram showing another embodiment of the present invention.

FIG. 3 is a diagram showing a conventional example.

[Explanation of symbols]

 2a, 2b Piezoelectric element 3 Oscillator 6, 9 Vibrator 6a, 6b, 6c, 6d, 9a, 9b, 9c, 9d Side surface 7a, 7b, 7c, 7d Groove 8a, 8b, 10c, 10d

Claims (1)

[Claims] 1. A vibrator comprising a ridge extending in the longitudinal direction of the vibrating body, which is provided at a substantially central portion of the side surface of the vibrating body having a quadrangular cross-sectional shape in the width direction.