JPS6340907Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a case structure of a piezoelectric resonator having a spread vibration mode.

Conventionally, as shown in FIGS. 1a and 1b, for example, as shown in FIGS. It is surrounded by a frame 2 made of an insulating material having a relatively large width W, and both sides of the frame 2 are covered with terminal plates 3 and 4, and these terminal plates 3 and 4 are connected to the eyelets 5, . . . , 5 as described above. Support protrusions 6 and 7 are fixed to the frame body 2 and project from the terminal plates 3 and 4 toward the piezoelectric resonator 1.
The piezoelectric resonator 1 is held between the inner walls of the frame body 2 with a substantially constant gap g, and the lead terminals 9 are molded entirely with resin 8 and protrude from the terminal plates 3 and 4, respectively. It is known that 10 is made to protrude outside the resin 8 in the shape of a radial lead.

By the way, the piezoelectric resonator 1 described above has various dimensions depending on the frequency range in which it operates. A dedicated device must be used depending on the operating range of the piezoelectric resonator 1, which increases the cost of products using the piezoelectric resonator 1, and piezoelectric resonators 1 used in low frequency ranges have the disadvantage of increasing the size of the product. .

The present invention was made in order to eliminate the above-mentioned drawbacks in the case structure of conventional piezoelectric resonators.
By providing a notch at an axially symmetrical position of a piezoelectric resonator having a spread vibration mode, and by making the inner wall surface of a frame surrounding the piezoelectric resonator protrude at a substantially constant distance from the notch. , it is possible to change the operating frequency range without changing the maximum dimensions of the piezoelectric resonator, allowing the use of one type of frame and terminal plate for piezoelectric resonators that target various frequency ranges, and It is an object of the present invention to provide a case structure for a piezoelectric resonator at low cost, in which a terminal plate is fixed by a protruding part of the body, and the thickness of the frame is thinned to reduce the size.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the piezoelectric resonator case structure shown in FIGS. 1a and 1b, the present invention provides various parts on the four sides of the piezoelectric resonator 11 that vibrate in a non-energy confined spreading vibration mode, as shown in FIGS. 2a and 2b. Notches 12, . . . , 12 are provided by cutting out the respective node points (not shown) in the center in a substantially semicircular shape, while the frame 1 surrounding the piezoelectric resonator 11 is provided with notches 12, .
The inner wall surfaces of the notches 12, . . . , 12 are provided with protrusions 14, .
By means of eyelets 5, ..., 5 inserted into holes (not shown) provided in ..., 14, terminal plates 3 and 4 similar to those shown in FIG. , and the whole is molded with resin 8.

By doing the above, the piezoelectric resonator 11 can change the maximum external dimension (distance between opposing sides) by changing the depth of the notches 12, . . . , 12, etc. The dimensions of the frame 13 and the terminal plates 3 and 4 that accommodate the piezoelectric resonator 11 do not need to be changed for the piezoelectric resonator 11 operating in any frequency range. do not have.

Further, the terminal plates 3 and 4 are connected to the protrusion 1 of the frame 13.
4, . . . , 14, it is possible to reduce the thickness of the frame 13 and reduce the overall external size.

Next, another embodiment of the present invention is shown in FIG.

In the embodiment shown in FIG. 3, in the case structure of the piezoelectric resonator shown in FIGS. Piezoelectric resonator 2 provided with cutout portions 22, . . . , 22
1, and the above-mentioned notches 22,...
Protrusion portions 24, ..., 2 facing toward ..., 22
4, and the terminal plates 3, 4 are fixed to the frame body 23 by eyelets 5, .

The piezoelectric resonator 21 whose corner portions are cut out in a triangular shape is the piezoelectric resonator 1 shown in FIGS. 1a and 1b.
Although the piezoelectric resonator 21 operates in a higher frequency range, the maximum external dimension (distance between opposing sides) of the piezoelectric resonator 21 does not change, and the dimensions of the frame 23 and terminal plates 3 and 4 are as shown in Figure 2a. Similarly to the embodiments shown in FIGS. and b, there is no need to change it depending on the operating frequency range of the piezoelectric resonator 21.

Furthermore, the wall thickness of the frame 23 can be made thinner for the same reason as shown in FIGS. 2a and 2b, and the overall external shape can also be made smaller.

As is clear from the detailed explanation above, the present invention provides a notch to change the operating frequency without changing the maximum external dimension of the piezoelectric resonator, and also to Since the terminal plate is fixed by the protruding part of the frame body, it is possible to accommodate piezoelectric resonators targeting various frequency ranges with one type of frame body and terminal plate. The frame body and terminal plate can be used as general-purpose parts for various piezoelectric resonators, and the cost of products using piezoelectric resonators can be significantly reduced, and the thickness of the frame body can also be made thinner than conventional ones. Therefore, the shape of the above product can also be made smaller.

[Brief explanation of the drawing]

FIG. 1a is a partial cross-sectional plan view of the case structure of a conventional piezoelectric resonator, FIG. 1b is a cross-sectional view taken along the line -' of FIG. 1a, and FIG. FIG. 2b is a partially sectional plan view of the structure, FIG. 2b is a sectional view taken along the line -' of FIG. 2a, and FIG. 3, 4...terminal board, 5...grommet, 6,7...
Support projection, 8...Resin, 11...Piezoelectric resonator, 1
2... Notch, 13... Frame, 14... Projection, 21... Piezoelectric resonator, 22... Notch, 23
...protrusion, g...gap.

Claims (1)

[Scope of utility model registration request] A notch is provided at an axially symmetrical position of a piezoelectric resonator having a spread vibration mode, and an inner wall surface of a frame surrounding the piezoelectric resonator is protruded at a substantially constant distance from the notch. , a piezoelectric resonator characterized in that terminal plates covering both sides of the frame are fixed to the frame at portions protruding from the inner wall surface, and the piezoelectric resonator is sandwiched between these terminal plates. case structure.