JPH0453056Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a piezoelectric resonator that includes a resonator case, a piezoelectric substrate, and a terminal plate body that is housed in the resonator case with the piezoelectric substrate sandwiched therebetween. The present invention relates to the structure of the terminal board body.

The terminal plate of a conventional piezoelectric resonator has figures 1 to 4.
There are those shown in each figure. A conventional terminal board 1 shown in FIG. 1 includes terminal board bodies 3, 3 positioned by the inner wall surface of a resonator case 2.
A protrusion 5 that comes into contact with the piezoelectric substrate 4 is formed at the center of each terminal board body 3 . In this terminal board, the protrusion 5 of the terminal board main body 3 can be brought into contact with the vibration node point of the piezoelectric substrate 4 by simply fitting the terminal board main body 3 into the resonator case 2, and the center can be easily centered. Although it has the advantage of being able to be pulled out, it has the disadvantage that the terminal board main body 3 cannot have spring properties.

Next, the terminal plate 1' shown in FIG. 2 has a terminal plate main body 3' which is punched out in a cantilevered manner toward one side at the center, and this punched-out tongue piece 6 is A protrusion 5' is formed. and,
This terminal plate 1' has the advantage that it is easy to center the terminal plate body 3' for the same reason as the terminal plate 1 shown in FIG. However, if the ejecting tongue 6 is deformed by the application of a load and the protrusion 5' is inclined, there is a drawback that the position of the protrusion 5' is shifted from the center.

Further, the terminal plate 1'' in FIG. 3 has a terminal plate main body 3'' which is curved symmetrically with respect to its center to provide spring properties. This has the advantage that the protrusion 5'' does not shift from the center even when subjected to a load. However, in a piezoelectric resonator, the terminal plate main body 3'' is curved symmetrically with respect to its center, giving it springiness.
A gap will be created between it and the resonator case (not shown). When designing, when the piezoelectric substrate is sandwiched between a pair of terminal board bodies and housed in the resonator case, dimensional changes occur due to load deformation of the terminal board body, so the dimensions of the resonator case must be determined in advance. It needs to be designed in a big way. however,
If the dimensions of the resonator case are increased, a dimensional difference will occur between the terminal block body and the inner wall surface of the resonator case. If a dimensional difference occurs, it is necessary to accurately center the protrusion of the terminal block body. become unable to do so.

Furthermore, the terminal plate 1 in FIG.
a and the tongue pieces 2 extending from each of its four corners.
It has a terminal board body 3 consisting of b, .
In this terminal board 1, the center part 2a of the terminal board main body 3 is embossed toward one side of the terminal board main body 3 rather than the tip 2c of each tongue piece 2b, so that the terminal board main body 3 has a spring property. However, the terminal plate 1'' shown in FIG.
It has the same drawbacks.

The present invention was devised in view of these inconveniences, and allows accurate and easy centering within the resonator case.
It is an object of the present invention to provide a structure of a terminal plate of a piezoelectric resonator that has spring properties and that prevents a protrusion from being displaced from the center even if deformation occurs under load.

In order to achieve these objectives, this invention
The structure of a terminal plate for a piezoelectric resonator includes a pair of terminal plate bodies sandwiching a piezoelectric substrate and housed in a resonator case, wherein each terminal plate body has an outer shape, a protrusion, and a protruding piece. The outer shape has a shape that is positioned by coming into contact with the inner wall surface of the resonator case, and the protruding portion is arranged within the outer shape so as to come into contact with a vibration node point of the piezoelectric substrate. The embossed pieces are provided at approximately the center position in a plan view and protrude toward the piezoelectric substrate side from the outer surface, and the embossed pieces consist of at least one pair, and their base ends are symmetrical in a plan view with the protrusion as the center. It is characterized in that it is continuous with the outer shape at a position, and its tip is connected to the protrusion at a position substantially opposite to the protrusion through the protrusion, so that it has spring properties.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

FIG. 5 is a partially cutaway exploded perspective view showing the piezoelectric resonator according to the present invention viewed from below. This piezoelectric resonator 7 is equipped with a resonator case 8, and inside this resonator case 8, a pair of terminal plate bodies 9 and 9' located on the upper and lower sides are housed with a piezoelectric substrate 10 sandwiched therebetween. . That is, these terminal board bodies 9, 9' and the piezoelectric substrate 10 are connected to the imaginary lines A,
They are placed one on top of the other as shown at B and A', and then inserted into the resonator case 8 through the opening 11. The terminal board main body 9 is
Outer shape 15, protrusion 12, and pair of stamped pieces 13, 13
It is composed of.

First, the outer shape 15 of the terminal board main body 9 is positioned by coming into line contact with the inner wall surfaces 8a, 8b, and 8c of the resonator case 8 while it is housed in the resonator case 8. Further, the protrusion 12 of the terminal board main body 9 is located at a substantially central position in the outer shape 15 in a plan view.
Moreover, it is provided so as to protrude from the outer surface to the piezoelectric substrate 10 side, and is in contact with the vibration node point of the piezoelectric substrate 10 (the center point of the piezoelectric substrate 10 in a plan view).

Furthermore, the pair of protruding pieces 13, 13 on the terminal board main body 9 are arranged so that the piezoelectric material to be supported is Substrate 10
Each of the stamped pieces 13 is formed in a shape that curves toward the side and extends, forming a pair of stamped pieces 13.
The proximal end is continuous with the outer shape 15, while the distal end is connected to the protrusion 1 at a position substantially opposite to the protrusion 12.
Connected to 2. In addition, here, punching formation means that the base end of each punched piece 13 is connected to the outer shape 15, while the tip end is connected to the terminal board main body 9.
This means a process in which the piezoelectric substrate 10 is made to protrude to a position close to the piezoelectric substrate 10 along the thickness direction.

That is, here, each of the punched-out pieces 13 has its base end cut and raised along a pair of two sides of the mutually opposing outer shape 15 of the terminal board main body 9, and its tip end that is perpendicular to the two sides. It has a shape in plan view that is bent at right angles along a pair of two sides, and the distal end curves toward the protrusion 12, thereby providing spring properties. Therefore, the protrusion 12 that comes into contact with the vibration node point of the piezoelectric substrate 10 is provided at the connection part 13c where the tips of the embossing pieces 13, 13 are connected to each other. Note that the reference numeral 14 in the figure indicates the terminal board main body 9.
This is a pull-out leg for external connection.

On the other hand, the lower terminal plate main body 9', which is disposed opposite to this terminal board main body 9 and holds the piezoelectric substrate 10, has a protruding piece 13' in a plane perpendicular to the point-symmetrical positions 9a, 9b and the protrusion 12'. Viewpoint symmetry position 9
It has the same structure as the terminal board main body 9 except that it is formed on each of a' and 9b'. Therefore, the protruding pieces 13, 13' on the terminal board bodies 9, 9' are provided at symmetrical positions orthogonal to each other with the protrusions 12, 12' contacting the vibration node points of the piezoelectric substrate 10 being the center point. This means that the

Furthermore, FIGS. 6 to 8 are plan views showing other examples of the terminal board main body, and parts that correspond to those in FIG. 5 are given the same reference numerals. That is, the terminal board main body 9 in FIG. 6 includes a protrusion piece 13 formed in a Z-shape in plan view, and the terminal board main body 9 in FIG. 7 includes a protrusion piece 13 in a Z-shape in plan view. .

As explained above, according to the present invention, the outer shape of the terminal board body is shaped to be positioned by contacting the inner wall surface of the resonator case, and the protrusion that contacts the vibration node point of the piezoelectric substrate is centered. At least one pair of extruded pieces are each extended from a symmetrical position in a plan view as a point, and each base end is continuous with the outer shape, while each tip end is connected to a protrusion, so that the terminal board body can be attached to the resonator case. You can accurately and easily center the protrusion by simply inserting it. In addition, since the tips of at least one pair of embossing pieces are connected to the protrusions at substantially opposing positions via the protrusions, even if the embossing pieces are elastically deformed under load, the connecting parts This provides the advantage that the protrusions formed on the substrate will not be tilted or misaligned.

[Brief explanation of the drawing]

1 to 4 are perspective views showing the structure of a piezoelectric resonator according to a conventional example, and FIG. 5 is a partially broken exploded perspective view showing the piezoelectric resonator according to the present invention as viewed from below. , and FIGS. 6 to 8 are plan views showing modified examples of the terminal board main body. 8... Resonator case, 9, 9'... Terminal board body,
9a, 9a', 9b, 9b', 9c, 9c', 9d, 9
d', 9e, 9f, 9g, 9h...point symmetrical position, 1
0...Piezoelectric substrate, 12, 12'...Protrusion, 13,
13'... Embossed piece, 13c, 13c'... Connection part,
14...Pull-out legs for external connection, 15...Outline.

Claims (1)

[Claims for Utility Model Registration] A terminal plate structure for a piezoelectric resonator comprising a pair of terminal plate bodies sandwiching a piezoelectric substrate and housed in a resonator case, wherein each terminal plate body has an outer shape and an outer shape. It has a protrusion and a protrusion piece, the outer shape has a shape that is positioned by abutting against the inner wall surface of the resonator case, and the protrusion comes into contact with a vibration node point of the piezoelectric substrate. The embossed pieces are provided at a substantially central position within the outer shape in a plan view and protrude toward the piezoelectric substrate side than the outer surface so as to be in contact with each other, and the embossed pieces are formed of at least one pair, and the base end thereof is connected to the protrusion. The outer shape is continuous with the outer shape at a symmetrical position in a plan view with the center at the center, and the distal end thereof is connected to the protrusion at a position substantially opposite to the protrusion, and has a spring property. The structure of the terminal plate of a piezoelectric resonator.