JPS5924180Y2 - Piezoelectric vibrator holding device - Google Patents

Description

[Detailed description of the invention] This invention relates to a holding device for a piezoelectric vibrator that utilizes longitudinal vibration mode and is used as a filter or an oscillation element. Moreover, it is an object of the present invention to provide a piezoelectric vibrator holding device that can be made thin as a whole.

Conventionally, this type of piezoelectric vibrator has been held by a holding device as shown in FIG. 1 or 2.

That is, the holding device shown in FIG. 1 is used to hold a relatively long piezoelectric vibrator, and has a piezoelectric vibrator 1 with counter electrodes of silver formed on both sides, an insertion hole in the middle part, and a substrate. 2 to 4 sponges 3 attached to the sponge 2 are inserted into the insertion holes and held.

The holding device shown in FIG. 2 is used to hold a relatively short piezoelectric vibrator of 20 to 3 Qmm or less, and has an insertion hole in the middle part and has a sponge or The center portion of the piezoelectric vibrator 1 is held with an elastic body 5 such as rubber, and that portion is adhesively fixed with an elastic adhesive 6 such as silicone rubber so that the support portion does not move.

In addition, in FIGS. 2 and 3, 4 and 4' represent piezoelectric vibrator 1.
This is a lead wire connected to the opposite electrode by soldering.

By the way, with the recent commercialization of ICs and LSIs, devices are becoming smaller and thinner, and as a result, smaller and thinner parts are required, and piezoelectric vibrators are being used. What I did is no exception.

However, with the above-mentioned conventional holding structures, in each case, the piezoelectric vibrator is held with a soft sponge or the center part is held with an elastic body so as to have as little influence on the piezoelectric vibrator's vibration as possible. Sufficient height is required to take into account the inclination, and the thickness of the elastic body must be thick to ensure robust retention.Furthermore, the lead wires must be soldered and terminals must be provided, so these must be placed inside the case. If the device is housed in a small space, the overall height will be high, making it difficult to create a thin design.

The present invention solves these conventional drawbacks, and the piezoelectric vibrator holding device of the present invention will be described below with reference to FIGS. 3 to 8.

FIG. 3 shows a piezoelectric vibrator holding device according to an embodiment of the present invention, and FIGS. 4 to 6 show its main structure and main parts.

In the figure, 10 is a piezoelectric vibrator, and this piezoelectric vibrator 10
It has a rectangular shape, with counter electrodes made of silver baked on both sides and polarized.

Reference numeral 11 denotes a molded body made of an insulator such as plastic having a U-shaped cross section, and a metal band 12 is provided at the inner bottom of the molded body 11.
is held through.

The piezoelectric vibrator 10 is placed on the metal band 12 so as to be substantially perpendicular to the metal band 12, and is bonded and fixed with a conductive adhesive 13, thereby connecting one electrode of the piezoelectric vibrator 10 and the metal band 1.
2 is connected.

Further, the portion of the metal band 12 that protrudes to the outside of the molded body 11 serves as one external terminal 12'.

Further, the width of the metal band 12 is set to be approximately 10% or less of the length of the piezoelectric vibrator 10 so as not to affect the vibration mode in the longitudinal direction of the piezoelectric vibrator 10. is placed so as to be located approximately at the center of the piezoelectric vibrator 10.

Reference numeral 14 denotes a metal case having a substantially U-shaped cross-section. At the inner bottom of the metal case 14, a substantially U-shaped metal spring 15, which is an elastic metal contact terminal, connects both ends of the metal case 1 to the metal case 1.
The metal spring 15 is arranged by being fixed to the inner bottom surface of the piezoelectric vibrator 10, and the apex portion of the metal spring 15 is in contact with the other electrode so as to be located approximately in the center of the piezoelectric vibrator 10, and is attached with a conductive adhesive. It is adhesively fixed with adhesive 13.

Further, this metal case 14 is placed over the molded body 11, and a part of the metal case 14 is placed over the external terminal 12' of the metal band 12.
The external terminal 14' is formed by bending it so that it is located on the same plane as the external terminal 14'.

Note that, in addition to the metal spring 15, a seventh metal contact terminal connected to the other electrode of the piezoelectric vibrator 10 is used here.
Using a U-shaped metal spring 16 as shown in the figure, one piece of the metal spring 16 may be connected to the metal case 14 and the other piece may be connected to the other electrode of the piezoelectric vibrator 10. A metal spring 17 as shown in the figure may also be used.

As is clear from the above explanation, according to the piezoelectric vibrator holding device according to the present invention, the total height of the piezoelectric vibrator held is approximately equal to the thickness of the metal case, the thickness of the metal contact terminal, the thickness of the piezoelectric vibrator, It is determined by the thickness of the metal strip and the thickness of the bottom of the molded body, and it is easy to design it to 2 mm or less, and since the piezoelectric vibrator is firmly held on the metal strip, it is possible to obtain good characteristics. can.

Furthermore, since the metal band and a part of the metal case are used as external terminals, the number of parts is small and the shape can be made compact, which is of extremely high practical value.

[Brief explanation of drawings]

1 and 2 are respectively perspective views showing a conventional piezoelectric vibrator holding device, FIG. 3 is a sectional view showing a piezoelectric vibrator holding device according to an embodiment of the present invention, and FIG. 4 is the same device. 5 and 6 are perspective views showing the main parts of the same device, and FIGS. 7 and 8 show other embodiments of the parts shown in FIG. 6, respectively. FIG. 10...Piezoelectric vibrator, 11...Molded body, 12...Metal band, 14...Metal case, 15.16... Metal spring, 17...
·spring.

Claims (1)

[Scope of utility model registration request] A metal band that is almost orthogonal to a rectangular piezoelectric vibrator that uses vibration mode in the longitudinal direction and is adhesively fixed to one electrode of the piezoelectric vibrator, and an insulating molded body that holds this metal band. , a piezoelectric device comprising an elastic metal contact terminal adhesively fixed to the other electrode of the piezoelectric vibrator, and a metal case to which the metal contact terminal is connected and fixed inside and housing the piezoelectric vibrator. Vibrator holding device.