JPH07176977A - Piezoelectric component - Google Patents

Abstract

PURPOSE:To eliminate the need for designation of front and rear side directions when a ground terminal is contained in a case and to make the size small by arranging a relay piece of a relay terminal to a recessed part provided to an inner wall of one end of a case from which an external connection section of the ground terminal is led out. CONSTITUTION:The piezoelectric component is made up of a case 1, four piezoelectric resonators 5-8, an input terminal 10, a relay terminal 11, a ground terminal 12 and an output terminal 13. Since relay pieces 11e, 11d of the relay terminal 11 are arranged in recessed parts 1c, 1d provided to an inner wall of an end 1b of the case 1 of the piezoelectric component, the thickness of the side 1e of the case 1 is made thinner than that of a conventional piezoelectric component. On the other hand, an opening 2b of the case 1 is set smaller than that of the conventional piezoelectric component because of provision of the recessed parts 1c,1d. Thus, the recessed parts 1c, 1d are provided without making the thickness of the end 1b of the case 1 thick.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric component used as a ladder type filter, an oscillator, a discriminator or the like.

[0002]

2. Description of the Related Art As a piezoelectric component of this type, as shown in FIGS. 3 and 4, piezoelectric resonators 35, 36, 37, 3 are shown.
There is a structure in which eight, the input / output terminals 40 and 43, the ground terminal 42, and the relay terminal 41 are stacked and housed in a case 31 having a substantially box shape. This piezoelectric component has openings 32a and 32b at both ends 31a and 31b of the case 31, respectively. From the sealing materials 49 and 50 closing the openings 32a and 32b to the input terminal 40, the output terminal 43 and the ground terminal. 42 has been derived. The relay terminal 41 includes electrode pieces 41a, 41b, 41c and a relay piece 41d.

The relay piece 41d of the relay terminal 41 is a case 3
It is arranged in a cutout portion 31d provided on the inner wall of the left side portion 31c of the No. 1 unit. Therefore, in order to secure the mechanical strength of the case 31, it is necessary to increase the wall thickness of the portion where the cutout portion 31d is provided, which limits the miniaturization of the component.
That is, the width L1 of the piezoelectric component needs to be at least 6.0 mm, and the length L2 is 7.0 mm.

Further, the center line 50 of the piezoelectric component having the above structure and the center line 51 of the case-stored items 35 to 38, 40 to 43 are displaced by the distance D. Therefore, the ground terminal 42 has a left-right asymmetrical shape, and there is a restriction that it must be housed in the case 31 in the specified front and back directions. Therefore, an object of the present invention is to provide a small-sized piezoelectric component that does not specify the front and back directions when housing the ground terminal in the case.

[0005]

In order to solve the above problems, a piezoelectric component according to the present invention comprises: (a) a substantially box-shaped case; and (b) a piezoelectric resonator housed in the case. And (c) a relay terminal that is housed in the case and that has at least two electrode piece parts and a relay piece part that electrically connects the electrode piece parts, and (d) is housed in the case, And, an external connection portion and an input terminal and an output terminal led out from an opening provided at one end of the case,
(E) a ground terminal housed in the case and having an external connection part led out from an opening provided at the other end of the case; (f) an external connection part of the ground terminal led out. The relay piece of the relay terminal is disposed in the recess provided in the inner wall of the end portion of the case.

In the above structure, the relay terminal portion of the relay terminal is disposed in the recess provided in the inner wall of the one end of the case from which the external connection portion of the ground terminal is led out.
It is not necessary to provide a cutout portion on the inner wall of the case side portion as in the conventional piezoelectric component, and the mechanical strength of the case is secured even if the thickness of the side portion is reduced. Then, by setting the opening for leading out the external connection portion of the ground terminal smaller than that of the conventional piezoelectric component, the relay piece portion of the relay terminal can be formed on the inner wall of the end without increasing the thickness of the case end. A recess is provided for placement.

Furthermore, since it is not necessary to provide a notch on the side of the case, the center line of the piezoelectric component does not deviate from the center line of the piezoelectric resonator and various terminals housed in the case.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the piezoelectric component according to the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the piezoelectric component includes a case 1, four piezoelectric resonators 5,
6, 7, 8 and an input terminal 10, a relay terminal 11, a ground terminal 12, and an output terminal 13. The piezoelectric resonators 5 to 8 are well-known ones having vibration electrodes provided on the front and back surfaces, respectively.

The case 1 has a substantially box shape, and both ends 1 thereof are
A and 1b have openings 2a and 2b, respectively. The inner wall of the end 1b is provided with recesses 1c and 1d.
The input terminal 10 includes an electrode piece portion 10a, an external connection portion 10b, and a protrusion 10c, and the protrusion 10c is in pressure contact with the upper surface of the piezoelectric resonator 5. The relay terminal 11 includes an electrode piece portion 11c and a relay piece portion 11 which are formed by bending and overlapping the electrode piece portions 11a and 11b.
d, 11e and protrusions 11f, 11g, 11h, the protrusion 11f is in pressure contact with the lower surface of the piezoelectric resonator 5, the protrusion 11g is in pressure contact with the upper surface of the piezoelectric resonator 6, and the protrusion 11h is in contact with the piezoelectric resonator 8.
Is pressed against the bottom surface of. The relay pieces 11d and 11e are arranged in the recesses 1d and 1c of the case 1, respectively.

The ground terminal 12 includes an electrode piece 12a and an external connection portion 12c, which are formed by bending and overlapping the electrode piece 12a.
And projections 12d and 12e, the projection 12d is in pressure contact with the upper surface of the piezoelectric resonator 7, and the projection 12e is in pressure contact with the lower surface of the piezoelectric resonator 6. The output terminal 13 includes an electrode piece portion 13b that is bent and overlapped with the electrode piece portion 13a, an external connection portion 13c, and protrusions 13d and 13e, and the protrusion 13d is the piezoelectric resonator 7.
, And the projection 13e is in pressure contact with the upper surface of the piezoelectric resonator 8.

The piezoelectric resonators 5-8 and the terminals 10-13 are
After being preliminarily aligned and stacked outside the case 1, they are collectively inserted from the opening 2a of the case 1. The external connection portions 10b and 13c of the input terminal 10 and the output terminal 13 are led out from the opening 2a, and the external connection portion 12c of the ground terminal 12 is led out from the opening 2b. Further, after the insulating paper 16 is set on the step portion of the end portion 1a of the case 1, sealing materials 19 and 20 are potted in the openings 2a and 2b, respectively, to seal the inside of the case 1. External connection portions 10b, 12c, 1 of the terminals 10, 12, 13
3c is bent along the shape of the case 1 to be a surface mount type.

The piezoelectric component thus obtained has the relay terminal 1 in the recesses 1c and 1d provided in the inner wall of the end 1b of the case 1.
Since the first relay piece portions 11e and 11d are provided, the thickness of the side portion 1e of the case 1 can be made thinner than that of the conventional piezoelectric component. On the other hand, the opening 2b of the case 1 has the recess 1
In order to provide c and 1d, it is set smaller than the conventional piezoelectric component. Thereby, the recesses 1c and 1d can be provided without increasing the thickness of the end 1b of the case 1. As a result, the width L1 is 5.5 mm and the length L2 is 7.0.
mm piezoelectric components are obtained. In this example, the height of the piezoelectric component was reduced from 4.0 mm to 3.0 mm by changing the plate thickness of each terminal 10 to 13 from 0.1 mm to 0.08 mm.

Further, as in the conventional case, the side portion 1e of the case 1 is
Since it is not necessary to provide a notch in the center line 25 of the piezoelectric component,
And the center lines 26 of the stored items 5 to 8 and 10 to 13 coincide with each other. Therefore, the ground terminal 12 has a bilaterally symmetrical shape, and the constraint of designating the front and back directions at the time of assembly is eliminated. The piezoelectric component according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the gist thereof. In particular, the shape of the relay terminal is arbitrary, and can be variously modified according to the specifications of the piezoelectric component. In the above-mentioned embodiment, the one having the two relay piece portions has been described, but the one having only one of the two may be used. However, the one having two relay pieces can hold the piezoelectric resonator in a more stable state.

[0014]

As is apparent from the above description, according to the present invention, the relay piece of the relay terminal is arranged in the recess provided in the inner wall of the end of the case. Since it is not necessary to provide a cutout portion on the side portion of the case, the thickness of the side portion of the case can be made thinner than the conventional piezoelectric component, and a small piezoelectric component can be obtained.

Furthermore, since the center line of the piezoelectric component and the center line of the piezoelectric resonator and each terminal coincide with each other, the ground terminal has a symmetrical shape. Therefore, there is no restriction on the front / back direction designation at the time of assembly, and the efficiency of assembly work is improved.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a piezoelectric component according to the present invention.

FIG. 2 is a horizontal sectional view showing the internal structure of the piezoelectric component shown in FIG.

FIG. 3 is a vertical sectional view showing a conventional example.

FIG. 4 is a horizontal sectional view showing the internal structure of the conventional example shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Case 1a, 1b ... End part 1c, 1d ... Recessed part 2a, 2b ... Opening part 5, 6, 7, 8 ... Piezoelectric resonator 10 ... Input terminal 10b ... External connection part 11 ... Relay terminal 11a, 11b, 11c ... Electrode piece 11d ... Relay piece 12 ... Ground terminal 12c ... External connection 13 ... Output terminal 13c ... External connection

Claims (1)

[Claims] 1. A substantially box-shaped case, a piezoelectric resonator housed in the case, at least two electrode piece parts housed in the case, and a relay electrically connecting the electrode piece parts. A relay terminal having a piece, an input terminal and an output terminal housed in the case, and having an external connection part led out from an opening provided at one end of the case, and housed in the case And an external connection portion is provided with a ground terminal leading out from an opening provided at the other end portion of the case, and on an inner wall of the case end portion where the external connection portion of the ground terminal is led out. A relay component of the relay terminal is disposed in the provided recess, and a piezoelectric component.