JPS602660Y2 - Piezoelectric vibrator holding structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric vibrator holding structure that can reliably hold a vibrator piece excited with piezoelectric vibration.

In general, a piezoelectric vibrator using a piezoelectric material such as crystal has a pair of terminals planted in the base, a wire cut to a predetermined length is attached to the tip of the terminal, and the tip of the wire is bent into a clip shape. The two edges of the plate-shaped vibrator piece are held between the two sides.

Electrodes formed on both plate surfaces of the vibrator piece are connected to the wires, and piezoelectric vibrations are excited from the outside via the terminals.

By the way, it is ideal for such a vibrator to be excited without any stress being applied from the outside.

Therefore, even when the vibrator piece is clamped at the tip of the wire as described above, great care must be taken not to impair its vibration characteristics.

However, in such a device, torsional stress or the like tends to act on the vibrator piece due to the elasticity of the wire itself, and also requires a step of forming the wire into a clip shape.

For this purpose, it has been considered to use a plate-shaped holding piece as shown in FIG. 1, for example.

That is, in FIG. 1, 1 is a base on which a pair of terminals 2, 2 are implanted in an electrically insulated state, and 3, 3 is a plate-shaped base whose base end is attached to the tip of the terminal 2.2. It is a holding piece.

These holding pieces 3, 3 have a through hole bored in the longitudinal direction at the center of the width direction of the tip part, and a convex part 3a protruding to one side in the thickness direction is formed in this part.

Reference numeral 4 denotes a vibrator piece whose outer peripheral edge is fitted into the through hole of the holding piece 3 and is held between the opposing surfaces of the holding piece 3 at the convex portion 3a.

Note that this vibrator piece 4 has electrodes of a predetermined shape formed on both plate surfaces, and is connected to the terminals 2, 2 through the holding pieces 3, 3 using conductive adhesive, solder, etc., respectively. 2
Piezoelectric vibrations are excited from the outside via the

Further, the case 5 is placed over the base 1 as shown by the broken line in the figure.

However, in such a device, it is the vertices of the convex portions 3a of the holding pieces 3, 3 that substantially come into contact with the plate surface of the vibrator piece 4, so that the vibrator piece 4 contacts the apex of each convex portion 3a, that is, the 2 Since it was supported at points, there were problems with vibration resistance and impact resistance.

The present invention was developed in view of the above circumstances, and the purpose is to provide a piezoelectric vibrator holding structure that has excellent vibration resistance and impact resistance, and can obtain good electrical characteristics. .

Hereinafter, one embodiment of the present invention will be described in detail with reference to the front view shown in FIG.

In the figure, 11 is a base on which a pair of terminals 12 and 12 are installed;
3.13 is a holding piece made of, for example, a metal plate, whose base end is attached to the tip end of the terminal 12.12.

This holding piece 13 is, for example, the front view shown in FIG.
As shown in FIG. 3 (a)--(3), two through holes 13a are bored along the longitudinal direction at the widthwise center of the distal end.

Then, as shown in FIG.
It is shaped like b.

14 is a convex portion 1 whose outer peripheral edge is provided on the holding piece 13.
This is a vibrator piece inserted into the through hole 13a of 3b.

This vibrator piece 14 is cut out from a piezoelectric material such as crystal at a predetermined angle and in a predetermined shape, and has electrodes 14a formed on the plate surface.

Then, a lead-out portion for leading out the electrode 14a of this vibrator piece 14 to the outer peripheral edge of the plate surface is attached near the apex of the convex portion 13b of the holding piece 13 using a conductive adhesive, solder, etc., and It is made to be electrically conductive.

Then, piezoelectric vibration is excited in the vibrator piece 14 by a signal applied from the outside via the terminal 12.

Note that 15 is a case with an opening fitted into the base 11.

With such a configuration, a signal applied from the outside via the terminal 12 is applied to the electrode 14a via the terminal 12, the holding piece 13, and the lead-out portion of the vibrator piece 14, thereby exciting piezoelectric vibration.

Since the vibrator piece 14 is held at two points by each holding piece 13, that is, at four points by a pair of holding pieces 13, it can be held stably and reliably, resulting in excellent vibration resistance and shock resistance. You can get sex.

Furthermore, since the vibrator piece 14 is held between the plate-shaped holding pieces 13 in the thickness direction, no unreasonable stress is applied to the vibrator piece 14 in the thickness direction, thereby ensuring good electrical characteristics. can get.

Note that the present invention is not limited to the above-mentioned embodiment, and for example, as shown in FIG.
A continuous through hole 13a may be provided in the hole 3b.

As described in detail above, the present invention provides a through hole along the longitudinal direction at the tips of a pair of holding pieces arranged facing each other, and forms two convex portions protruding inward at the tips. The outer periphery of the vibrator piece, which is excited by piezoelectric vibration, is fitted into the through hole and held between the holding pieces.

Therefore, it is possible to provide a piezoelectric vibrator holding structure that has excellent vibration resistance and impact resistance, and also provides good electrical characteristics.

[Brief explanation of the drawing]

Fig. 1 is a front view showing a conventional example, Fig. 2 is a front view showing an embodiment of the present invention, Fig. 3a is a front view showing a holding piece of the above embodiment, and Fig. Sectional view 4 of section a on line ■-m
Figure a is a front view showing a holding piece of another embodiment of the present invention;
The figure is a cross-sectional view taken along the line ■--■ in FIG. 4a. 11...Base, 12...Terminal, 13
...Holding piece, 13a...Through hole, 13b
...Convex portion, 14... Vibrator piece, 14a
... Electrode, 15 ... Case.

Claims (1)

[Scope of utility model registration request] A pair of terminals are implanted in the base, and the proximal end is attached to each terminal, and the terminals are arranged facing each other at a predetermined interval, and a through hole is provided in the center of the width direction of the tip along the longitudinal direction. At the same time, there is a holding piece having two convex portions protruding inwardly formed on the tip thereof, and an electrode formed on the plate surface which is sandwiched by inserting the outer peripheral edge into the through hole of the convex portion of the pair of holding pieces. A holding structure for a piezoelectric vibrator, comprising: a vibrator piece whose lead-out portion is connected to the holding piece near the apex of the convex portion, and whose piezoelectric vibrations are excited by a signal applied from the outside via the terminal.