JPS6130335Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for a piezoelectric resonator that stably supports a piezoelectric resonator electrically and mechanically.

When using a disc-shaped piezoelectric resonator exhibiting radial vibration or a rectangular plate-shaped piezoelectric resonator exhibiting longitudinal vibration to fully utilize their excellent characteristics to construct a filter, etc., the geometrical shape of the piezoelectric resonator The center position must be stably supported. Conventionally, this piezoelectric resonator has been supported by clamping it using tongues of a support terminal plate or by soldering lead wires. Conventionally, however, the former method has had the disadvantage that the support position held by the tongues tends to shift from the center position due to external vibrations, shocks, etc. For this reason, it is difficult to maintain stable electrical characteristics due to changes in the resonance characteristics of the filter, and mechanical reliability is also poor. Further, in order to solve this problem, when the tongue piece of the support terminal plate is given a large spring characteristic, a problem arises in that the vibration of the piezoelectric vibrator is hindered by this tongue piece. In addition, when using lead wires, it is difficult to accurately find the center position and solder, and in addition, there are limits to miniaturization due to the length of the lead wires.
There are many problems with the risk of wire breakage due to vibration, etc. Furthermore, it is very difficult to automate the lead wire attachment work, and in the end, the work must be done manually. Furthermore, if you try to mechanically and stably support the piezoelectric resonator by other means, the support structure will become complicated and large, so in the end,
The scope of use was limited. As described above, in the past, there was no simple support structure that could fully utilize the electrical characteristics of piezoelectric resonators, and this hindered the wide range of applications of piezoelectric resonators.

The present invention was developed in consideration of these circumstances, and its purpose is to stably support the center position of a piezoelectric vibrator with a simple configuration and fully demonstrate its electrical characteristics. It is an object of the present invention to provide a support structure for a piezoelectric vibrator that can be used in a piezoelectric vibrator and has high mechanical reliability against vibrations and the like.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an external perspective view schematically showing a piezoelectric vibrator 1 supported by this structure. This piezoelectric vibrator 1 is manufactured by cutting highly stable and high-performance Pb (Co1/2 W1/2) ZrTiO ₃ of PZT ceramic into a predetermined shape and polishing it on both sides of a substrate 2. Silver thin film layers (electrodes) 3 and 4 with a thickness of about 5 [μm] are formed. On the surface of the piezoelectric vibrator 1, an annular micro-protrusion 5 is protruded from its geometric center. The microprotrusions 5 are made by cutting a microscopic pipe made of, for example, phosphor bronze into rings, and the surface thereof is treated with nickel plating or the like. Then, it is fixed at the above position by soldering or adhesive.

On the other hand, FIG. 2 is a diagram showing the support terminal plate 7 that supports the piezoelectric vibrator 1, in which a is an external perspective view and b is a side sectional view. This support terminal plate 7 is, for example, a phosphor bronze thin plate for springs (manufactured by Nippon Dogyo Co., Ltd.: PBS-PH-
0.2t) was cut into a predetermined shape and press-formed. That is, the flat plate spring part 7b is formed by bending the inside of the flat plate part 7a, and the central part thereof is further protruded to form a frustum-shaped part 7c. The tip of this frustum-shaped portion 7c fits inside the annular projection 5, and a planar contact portion 7d consisting of a minute area at the tip comes into contact with the electrode 3 of the piezoelectric vibrator 1. Further, one end of the flat plate portion 7a extends laterally to form an electrode lead portion 7e. A voltage is applied to the piezoelectric vibrator 1 via this lead portion 7e.

The support terminal plate 7 having such a shape generates a spring force, that is, a vertical load, on the flat spring portion 3b using the portion indicated by A in the figure as a support point. Then, this vertical load is smoothly transmitted via the frustum-shaped portion 7c, and presses the piezoelectric resonator 1 that is in contact with the planar contact portion 7d. The piezoelectric vibrator 1 is supported using this pressing force.

FIG. 3 is a schematic cross-sectional view showing the support structure according to the present invention.

That is, two support terminal plates 7 (first and second)
The frustum-shaped parts 7c are opposed to each other, and the piezoelectric vibrator 1 is interposed between them. At this time, each frustum-shaped portion 7c fits inside the annular projection 5 of the piezoelectric vibrator 1, and the planar contact portion 7d is connected to the electrodes 3, 4.
is in contact with. In other words, the support terminal plate 7 contacts the position determined by the protrusion 5 and sandwiches the piezoelectric vibrator 1. On the other hand, the support point A is pressed in the direction of the arrow by, for example, a displacement supply plate (not shown). Due to this force, the flat spring portion 3b
An appropriate spring force is generated. This spring force, that is, the vertical load is applied to the frustum-shaped portion 7c as explained earlier.
, and presses the piezoelectric vibrator 1. Therefore, the piezoelectric vibrator 1 has the first and second support terminal plates 7
Appropriate pressure is applied and clamped by.

With such a structure, the spring force of the flat spring portions 3b of the first and second support terminal plates 7 is
Since it is applied to a minute region of the piezoelectric vibrator 1 through the frustum-shaped portion 7c, the piezoelectric vibrator 1 is stably supported without being hindered from its piezoelectric vibration. Moreover, the support positions of the piezoelectric vibrator 1 by the first and second support terminal plates 7 can be easily and accurately determined by the projections 5. Therefore, positioning during manufacturing is very easy.
In addition, even when vibration or impact is applied, the protrusion 5
Since the truncated conical portion 3c is prevented from shifting, the support position does not change and is mechanically very stable. Furthermore, since the piezoelectric vibrator 1 is supported mechanically and stably without being hindered in its piezoelectric vibration, the high-performance electrical characteristics of the piezoelectric vibrator 1 can always be fully exhibited. , it is also extremely superior electrically. Further, the work of protruding the protrusion 5 requires simply fixing the chip-like protrusion, which is simpler than conventional lead wire soldering, and can be easily automated. Then, the assembly consists of the pair of first and second support terminal plates 7.
It is sufficient to simply hold the piezoelectric vibrator 1 between the two, which is simple and labor-saving. At this time, there is no need to perform positioning, and there is no need to confirm or inspect the support position after assembly.
Therefore, the work process can be simplified.
It is also clear that the present structure does not have any of the various drawbacks of the prior art described above. Thus, according to the present structure, it is possible to easily realize, for example, a small and high-performance piezoelectric filter that is simple and has sufficient mechanical and electrical characteristics.

Note that the present invention is not limited to the above embodiments. For example, if the casing that houses the piezoelectric vibrator 1 and the support terminal plate 7 restricts the displacement of the support terminal plate 7 in the lateral direction (width direction of the piezoelectric vibrator 1), as shown in FIG. As shown, two protrusions 8 may be provided. Needless to say, even in this manner, the piezoelectric vibrator 1 can be mechanically stably supported without being hindered from piezoelectric vibration, accurate positioning can be performed, and displacement can be prevented. Also, as shown in Figure 5,
The projection 8 may be provided only on one side of the piezoelectric vibrator 1. It goes without saying that the height and shape of the protrusion 8 should be such that it does not adversely affect the electrical characteristics of the piezoelectric vibrator 1. Furthermore, the sixth
As shown in the figure, a microprotrusion 5a is provided at the center of the piezoelectric vibrator 1, and the microprotrusion 5a is fitted onto the tip of the frustum-shaped portion 7c of the support terminal plate 7 that supports the piezoelectric vibrator 1. A hole 9 for regulating the supporting position may be formed as shown in FIG. Further, the shapes, dimensions, materials, etc. of the piezoelectric vibrator 1 and the support terminal plate 7 may be set according to desired characteristics and specifications. Furthermore, when realizing a piezoelectric filter using this structure, a plurality of the above structures can be arranged in series to form a multi-stage structure. Further, a protrusion may be provided at the end of the support terminal plate 7, and the support terminal plate 7 itself may be prevented from shifting due to the casing of the protrusion. In short, the present invention can be implemented with various modifications without departing from the gist thereof.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, in which Fig. 1 is a schematic diagram of a piezoelectric vibrator, Fig. 2 is a schematic diagram of a support terminal plate, Fig. 3 is a sectional view showing a support structure, and Fig. 4 is a schematic diagram of a piezoelectric vibrator. FIG. 5 is a schematic diagram showing another embodiment of the vibrator, FIG. 5 is a sectional view showing a support structure of another embodiment, and FIGS. 6 and 7 are diagrams each showing a modification of the present invention. DESCRIPTION OF SYMBOLS 1... Piezoelectric vibrator, 5... Protrusion, 7... Support terminal plate, 7b... Flat spring part, 7c... Frame-shaped part,
8... Protrusion.

Claims (1)

[Claims for Utility Model Registration] (1) First and second support terminal plates provided with frustum-shaped protrusions protruding from the center of a flat spring portion having predetermined spring characteristics facing each other; A piezoelectric vibrator supported by sandwiching the approximate center of the vibration node between the frustum-shaped projections of the first and second support terminal plates, and a piezoelectric vibrator supported by the frustum-shaped projections of the piezoelectric carrier. 1. A support structure for a piezoelectric vibrator, comprising: a micro protrusion that protrudes near a portion and restricts a support position of the piezoelectric vibrator by the frustum-shaped protrusion. (2) The support terminal plate is made of a conductive spring material and acts as an electrode terminal of the piezoelectric vibrator.
A support structure for a piezoelectric vibrator according to claim 1, wherein the piezoelectric vibrator is held between the piezoelectric vibrators by a load generated on the flat spring portion.