JPH0241947Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a thickness-shear vibrator equipped with a rod-shaped thickness-shear vibrator.

(b) Conventional technology Figure 1 shows this type of thickness shear vibration device.
is a rod-shaped thickness shear oscillator (hereinafter simply referred to as a oscillator) made of a piezoelectric single crystal such as lithium tantalate LiTaO _3; 2, 2 are a pair of opposing electrodes provided on opposing surfaces of the oscillator 1; 3, 3 is the counter electrode 2, 2
A pair of extraction electrodes 4, 4 are drawn out in opposite end face directions from a pair of support pieces 6, which electrically and mechanically support the vibrator 1 through conductive adhesives 5, 5 in the vicinity of the end faces of the vibrator 1. , 6 are a pair of support pins extending from the support pieces 4, 4, and 7 is a support base that supports the vibrator 1 by holding the support pins 6, 6.

Such conventional devices have the following drawbacks.

(a) When the vibrator 1 is adhesively fixed, the vibrator 1 moves in its longitudinal direction, which causes positional shift until it is completely adhesively fixed.

(b) Since it is difficult to control the amount of adhesive 5, 5 applied,
The suppression ratio of unnecessary sub-vibrations varies in correlation with the amount of adhesives 5, 5 applied.

(c) Since the load on both end faces of vibrator 1 is small,
Reflections occur, generating spurious signals and ripples.

In order to eliminate such shortcomings,
There is a thickness shear vibration device as shown in FIG.

In FIG. 2, parts that are the same as those in FIG. 1 are given the same reference numerals and their explanations will be omitted.

The difference from the one in FIG. 1 lies in the specific shape and bonding structure of the pair of support pieces 4, 4. That is, after the pair of support pieces 4, 4 are fixed face-to-face to the support pins 6, 6, which are electrically insulated from the support base 7, a pair of opposing parts 4 are formed at the tips of each of the support pieces 4, 4.
A, 4b, 4a, 4b are left, and the center part faces outward and the vibrator 1 is placed on it, and the vibrator 1 is bent almost horizontally. It is provided with contact parts 4d, 4d that come into contact with the end surface of the vibrator 1 which is bent in a direction. The opposing parts 4a, 4b, 4a, 4b of each support piece 4, 4 are provided at a distance D into which the vibrator 1 is inserted,
Also, the contact portion 4 is bent vertically upward.
The opposing length L of d and 4d is equal to the length of the vibrator 1 in the longitudinal direction.

Therefore, when the vibrator 1 is inserted in the longitudinal direction between the opposing parts 4a, 4b, 4a, 4b of the pair of support pieces 4, 4 having the above-mentioned shape,
The bottom surface near both end surfaces of the vibrator 1 is the mounting portion 4c, 4c.
At the same time, both end surfaces are placed on the placing portions 4c, 4c.
The distal ends thereof abut against the bent abutment portions 4d, 4d, and are positioned. In this positioned state, the opposing parts 4a, 4b, 4a, 4 of each support piece 4, 4
conductive adhesive 5 between b and the contact parts 4d, 4d,
5, the adhesive 5, 5 is applied to the opposing parts 4a, 4.
b, 4a, 4b and the contact portions 4d, 4d. Further, the amount of coating is also approximately constant because the coating position is limited to the surrounded area, and the constant amount also increases to electrically and mechanically connect both end surfaces to the supporting pieces 4, 4.

In this way, the vibrator 1 is fixed without shifting in the longitudinal direction, the amount of adhesives 5, 5 applied is regulated, the suppression ratio of secondary vibrations is made uniform, and the load on both end faces of the vibrator 1 is reduced. It is possible to increase the reflected waves and suppress the reflected waves.

However, the support pieces 4,
4, reflection at the end face of the vibrator 1 is not sufficiently suppressed.
In addition, since the support pieces 4, 4 are provided perpendicularly from the support pins 6, 6, both end surfaces of the vibrator 1 protrude outward, and the span length LL of the support base 7 becomes longer, resulting in an overall shape. It has the disadvantage of being large.

(c) Problems to be solved by the invention Therefore, the purpose of the present invention is to provide a thickness-shear vibrating device that can further suppress reflected waves at the end faces of the vibrator and can be miniaturized.

(d) Means for solving the problem In view of the above points, the thickness-shear vibrator of the present invention includes a rod-shaped thickness-shear vibrator, a support base,
a pair of support pins fixed to the support base; and a pair of support pins whose ends are fixed to the support pins, which are bent substantially horizontally in an outward direction and then bent substantially vertically in an upward direction, and which support the vibrator. each supporting piece has a mounting part on which the vibrator is placed, the central part of which is bent approximately horizontally with a pair of opposing parts left at the tips thereof, and a mounting part on which the transducer is bent substantially horizontally; The distal end of the mounting part is bent almost vertically upward, and a slit is provided near the center of the distal end, and a contact part abuts against the end surface of the vibrator;
The vibrator is adhesively fixed between the facing portion and the abutting portion of each of the supporting pieces.

(e) Effect With the above configuration, the bottom surface of the vibrator near both end faces is placed on the mounting part, and both end faces are brought into contact with the abutting part to be positioned. In the positioned state, conductive adhesive is applied between the opposing part of the support piece and the abutting part, and at this time, the adhesive wraps around to the end face of the vibrator through the slit provided in the abutting part. It is coated with

(f) Embodiment An embodiment of the present invention will be explained based on FIG. 3.
In FIG. 3, the same parts as those in the thickness shear vibrator shown in FIG.
4 is a support piece, 5, 5 is a conductive adhesive, 6, 6 is a support pin, and 7 is a support base. The difference from the one in FIG. 2 is the position of the support pins 6, 6 on the support base 7, the shape of the support pieces 4, 4,
This is because slits 8, 8 are provided near the center of the contact portions 4d, 4d of the support pieces 4, 4.

That is, the support pins 6, 6 are disposed close to the inside of the support base 7, and the support pieces 4, 4 are fixed to the support pins 6, 6, and are once bent outward to a substantially horizontal direction, and then bent upward. The front end is bent almost vertically.

Thereby, the span length of the support base 7 can be shortened compared to the conventional case, and the shape can be made smaller.

Further, slits 8, 8 are formed in the contact parts 4d, 4d of the support pieces 4, 4, so that the opposing parts 4a, 4b, 4a, 4b of the support pieces 4, 4 and the contact parts 4d, 4d When conductive adhesives 5, 5 are applied between them, the adhesives 5, 5 wrap around the end faces of the vibrator 1 and are applied to the end faces. Therefore, the load on both end faces of the vibrator 1 is further increased, and reflected waves at the end faces can be suppressed.

(g) Effects of the device As explained above, in the present invention, the vibrator is adhesively fixed between the facing portion and the abutting portion of each support piece, so the vibrator does not shift in its longitudinal direction. Fixed, it is possible to equalize the suppression ratio of secondary vibration by regulating the amount of adhesive applied, and by providing a slit in the contact part of the support piece, the load on both end faces of the vibrator is further increased. It is possible to prevent reflected waves that cause spurious waves and ripples.

[Brief explanation of the drawing]

Figures 1 and 2 are perspective views of the conventional device;
The figure is a perspective view of the thickness shear vibration device of the present invention. 1...Thickness-shear vibrator, 4...Support piece, 4
a, 4b... Opposing part, 4c... Placement part, 4d...
Contact portion, 5... conductive adhesive, 6... support pin,
7...Support base.

Claims (1)

[Claims for Utility Model Registration] A rod-shaped thickness shear vibrator, a support base, a pair of support pins fixed to the support base, and an end portion fixed to the support pins, which once faces outward and becomes substantially horizontal. It consists of a pair of supporting pieces that are bent almost vertically and that face upward after being bent and support the vibrator, and each of the supporting pieces has a central part facing outward, leaving a pair of opposing parts at the tips of each supporting piece. a mounting section on which the vibrator is placed, which is bent approximately horizontally; a tip of the mounting section is bent approximately vertically toward the top; a slit is provided near the center of the tip; and an end surface of the vibrator. A thickness shear vibrating device, comprising: a contact portion that abuts the vibrator, and wherein the vibrator is adhesively fixed between the opposing portion of each support piece and the contact portion.