JPS6042514Y2 - 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, the present invention provides 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.

Moreover, the holding device shown in FIG.
It is used to hold the following relatively short piezoelectric vibrator, and has an insertion hole in the middle and an elastic body 5 such as sponge or rubber attached to the substrate 2 to hold the center of the piezoelectric vibrator 1. , and furthermore, that part is adhesively fixed with an elastic adhesive 6 such as silicone rubber so that the support part does not move.

In addition, in FIGS. 1 and 2, 4 and 4' represent the 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, machines have become smaller and thinner, and as a result, smaller and thinner parts have been required, and piezoelectric vibrators have been 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 slope, and the elastic body must be thick to ensure solid holding.Furthermore, it is necessary to solder the lead wires and provide terminals, so these cannot be used in cases. When housed inside, the overall height increases, making it difficult to design 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 9.

The piezoelectric vibrator 10 used in the present invention has a substantially rectangular shape as shown in FIG. 3, and has silver electrodes baked on its upper and lower surfaces and is polarized.

Its resonant frequency is determined by the frequency constant and length.

FIG. 4 shows an example of a printed circuit board 11 that holds a piezoelectric vibrator 10. A printed wiring pattern is formed on one or both sides, and electronic components 12 such as ICs, resistors, and diodes are connected to the wiring pattern. An electric circuit is constructed by installing and wiring.

Furthermore, a hole 14 is provided in a part of the printed circuit board 11 to provide a gap between the holding section 13 that holds the piezoelectric vibrator 10 and the printed circuit board 11 so as not to affect the vibration of the piezoelectric vibrator 10. It is provided.

Further, FIG. 5 is an enlarged view of the holding part 13. A metal band part 15, which is a part of the printed wiring pattern, is formed on the holding part 13, and the electrodes on the lower surface of the piezoelectric vibrator 10 are fixed by adhesive.

Further, a metal film 17 is provided near the metal band portion 15 for connecting the silver electrode on the upper surface to the lead terminal 16.

Note that the piezoelectric vibrator 10 is disposed on the holding portion 13, that is, on the metal band portion 15 so as to be substantially orthogonal thereto.

FIG. 6 is a perspective view of the piezoelectric vibrator 10 installed on the printed circuit board 11, and as described above, the piezoelectric vibrator 10
is adhesively fixed onto the metal band portion 15 of the holding portion 13 with a conductive adhesive.

Further, a lead wire 16 is soldered to an electrode on the upper surface of the piezoelectric vibrator 10 and connected to a metal film 17 on a printed circuit board 11.

Here, as shown in FIGS. 7 and 8, the printed circuit board 11
In order to provide a gap between the printed circuit board 11 and the piezoelectric vibrator 10, a metal strip 18 is attached to the printed circuit board 11 by soldering or adhesive without providing a hole 14 or a recess, and the piezoelectric The vibrator 10 may be adhesively fixed using a conductive adhesive.

In addition, in the case of the present invention, the width of the holding part 13 and the metal band 18 is set to about 10% or less of the length of the piezoelectric vibrator 10 so as not to affect the vibration of the piezoelectric vibrator 10. It is important to install the piezoelectric vibrator 10 so that they are substantially perpendicular to each other at the center of the piezoelectric vibrator 10.

FIG. 9 shows the piezoelectric vibrator 10 in FIG. 6 or 7.
It is a perspective view showing a case 19 placed over the piezoelectric vibrator 10, and the case 19 is a printed circuit board 1.
It can be attached by soldering onto the printed circuit board 11 or by bending the terminals of the case 19 that pass through the printed circuit board 11.

As is clear from the above description, according to the piezoelectric vibrator holding device of the present invention, when the piezoelectric vibrator is held on a printed circuit board, the height is approximately equal to the height of the piezoelectric vibrator and the soldering of the lead wire. It is determined by the thickness of the metal strip, and the overall height can be significantly reduced.

Furthermore, since the piezoelectric vibrator is firmly held on the printed circuit board, its characteristics are extremely stable.

Furthermore, even when covered with a case, a gap is required to prevent contact with the piezoelectric vibrator due to the thickness of the case, but it is easy to design the overall height to 2rrvn or less, which is significantly greater than the conventional example. It can be made much thinner.

By covering the piezoelectric vibrator with a case, it is possible to prevent dust from adhering to the piezoelectric vibrator and preventing other parts from coming into contact with it.Furthermore, it can be directly attached to a printed circuit board, so once the piezoelectric vibrator is housed in the case, it can be removed. The structure is simpler than when it is mounted as a single component on a printed circuit board, and its industrial value is extremely large.

[Brief explanation of the drawing]

1 and 2 are perspective views showing a conventional piezoelectric vibrator holding device, FIG. 3 is a perspective view showing a piezoelectric vibrator used in the piezoelectric vibrator holding device of the present invention, and FIG. 4 is a perspective view showing a piezoelectric vibrator holding device according to the present invention. A perspective view showing a printed circuit board which is a main part of a piezoelectric vibrator holding device according to an embodiment of the present invention, FIG. 5 is an enlarged view of the main part of the printed board, and FIG. 6 is a printed circuit board shown in FIG. 4. FIG. 7 is a perspective view showing a piezoelectric vibrator holding device according to another embodiment of the present invention, FIG. 8 is a sectional view of the same, and FIG. FIG. 7 is a perspective view showing a piezoelectric vibrator holding device according to another embodiment of the present invention. 10...Piezoelectric vibrator, 11...Printed circuit board, 12...Electronic component, 13...
Holding part, 14...hole, 15...metal band part, 18...metal band, 19...case.

Claims (1)

[Scope of utility model registration request] It has a piezoelectric vibrator that has a rectangular shape and utilizes a vibration mode in the longitudinal direction, and a printed circuit board that configures an electric circuit by attaching electronic components and electrical wiring, and the electronic components of this printed circuit board A conductive band is provided in a part of the wiring pattern for electrically wiring the piezoelectric vibrator, and the piezoelectric vibrator is placed with a distance between it and the printed circuit board and is placed almost perpendicular thereto on the conductive band. A piezoelectric vibrator holding device formed by adhesively fixing a band and one electrode of a piezoelectric vibrator.