JPH077368A - Piezoelectric resonance parts - Google Patents

Abstract

PURPOSE:To obtain the ladder type piezoelectric resonance parts of a case contained type, which is thin in thickness, high in mass-productivity, and can minimize the influence of a terminal member with respect to a surface expanding vibration mode of a piezoelectric resonator. CONSTITUTION:A case 1 has an internal space 11. Piezoelectric resonators 21-24 have an electrode on both faces of a piezoelectric porcelain base body. Terminal members 31-34 consist of a plate-like metallic member, and have projecting pieces 41-48 louvered in the face. The piezoelectric resonators 21-24 and the terminal members 31-34 are superposed so as to constitute a ladder circuit and arranged in the internal space 11. The projecting pieces 41-48 of the terminal members 31-34 come into contact with the electrodes of the piezoelectric resonators 21-24, and in an area except the contact part of the projecting pieces 41-48, an interval is generated in advance between the piezoelectric resonators 21-24 and the terminal members 31-34.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric resonance component used for a ladder type ceramic filter or the like.

[0002]

2. Description of the Related Art Piezoelectric resonance components of this type are disclosed, for example, in Japanese Utility Model Publication No. 4-119130, Japanese Utility Model Publication No. 5-4622, and Japanese Utility Model Publication No. 5622.
No. 4623 and Japanese Utility Model Laid-Open No. 5-4624 are disclosed. As a basic configuration, a plurality of piezoelectric resonators,
The piezoelectric resonator and the terminal member are stacked so as to form a ladder circuit, and the assembly thereof is arranged in the internal space of the case. Each of the piezoelectric resonators is a flat plate-shaped element that utilizes the surface-spreading vibration mode,
Each of the terminal members comes into contact with the piezoelectric resonator at a node generated on the surface of the piezoelectric resonator, and the portions other than the contact points are arranged apart from the surface of the piezoelectric resonator. The terminal member is made of a metal plate material and is formed in advance into a shape required for stacking and contacting with the piezoelectric resonator.

[0003]

The above-described conventional piezoelectric resonance component has some points to be improved in terms of further thinning and improvement in mass productivity. For example, since the terminal member is formed by folding the metal plate in a double manner so as to be folded back, the thickness of the terminal member is twice or more the plate thickness. Further, since the metal plate is bent, mass productivity is poor.

An object of the present invention is to provide a case-type ladder-type piezoelectric resonance component.

Another object of the present invention is to provide a piezoelectric resonance component which is thin and has high mass productivity.

Still another object of the present invention is to provide a piezoelectric resonance component capable of minimizing the influence of the terminal member on the surface expansion vibration mode of the piezoelectric resonator.

[0007]

In order to solve the above problems, the present invention provides a piezoelectric resonance component including a case, a plurality of piezoelectric resonators, and a plurality of terminal members, wherein the case has an internal space. The piezoelectric resonator has electrodes on both sides of the piezoelectric ceramic body, the terminal member is a flat metal member, and has a protruding piece cut and raised in the surface. The piezoelectric resonator and the terminal member are overlapped with each other to form a ladder circuit and arranged in the internal space, and the projecting piece of the terminal member contacts the electrode of the piezoelectric resonator. A space is formed between the piezoelectric resonator and the terminal member in a region other than the contact portion of the projecting piece.

[0008]

Since the piezoelectric resonator and the terminal member are overlapped with each other so as to form a ladder circuit and arranged in the internal space, a case type ladder-type piezoelectric resonance component can be obtained.

Since the terminal member is made of a flat plate-shaped metal member and has a protruding piece that is cut and raised in the plane, the double folding structure and processing, which have been essential in the past, are unnecessary. For this reason, it becomes thin and mass productivity improves.

The piezoelectric resonator has electrodes on both sides of the piezoelectric ceramic body, the piezoelectric resonator and the terminal member are stacked so as to form a ladder circuit, and the projecting piece of the terminal member is the piezoelectric resonator. Since there is a gap between the piezoelectric resonator and the terminal member in the area that contacts the electrode and excludes the contact portion of the protrusion, the influence of the terminal member on the vibration mode of the piezoelectric resonator is maintained by the protrusion. Can be minimized by

[0011]

1 is an exploded perspective view of a piezoelectric resonance component according to the present invention, FIG. 2 is a partial sectional view of the piezoelectric resonance component according to the present invention shown in FIG. 1, and FIG. 3 is a line A3-A3 in FIG. It is a plane sectional view. Reference numeral 1 is a case, reference numerals 21 to 24
Is a piezoelectric resonator, reference numerals 31 to 34 are terminal members, and reference numerals 41 to 48 are projecting pieces. The case 1 has an internal space 11. The internal space 11 is open on one side of the case 1. The opening is filled with the insulating sealing resin 6. A terminal lead-out hole 12 (see FIG. 1) is provided at the bottom of the case 1 on the side opposite to the side where the insulating sealing resin 6 is filled.

Each of the piezoelectric resonators 21 to 24 has a structure in which electrodes are provided on both surfaces of a flat piezoelectric ceramic body in the thickness direction. The piezoelectric resonators 21 to 24 are preferably elements that utilize the surface expansion vibration mode. In the surface-spreading vibration mode piezoelectric resonators 21 to 24, the piezoelectric ceramic body is polarized so as to generate an electrostrictive phenomenon in a diagonal direction when an electric field is applied between electrodes on both surfaces. In the face-spreading vibration mode, a node is generated at the center of the plane of the piezoelectric ceramic body.
It is also possible to use a piezoelectric resonator that uses a length vibration mode in addition to the surface expansion vibration mode.

Each of the terminal members 31 to 34 is made of, for example, a copper plate or a phosphor bronze plate having a plate thickness of about 0.1 mm. Each of the terminal members 31 to 34 is
It has projecting pieces 41 to 48 cut and raised in the plane. Specifically, among the terminal members 31 to 34, the terminal member 3
1 has a structure in which a first contact piece 311 and a second contact piece 312, which face each other with a space therebetween, are connected by a connecting piece 313. First contact piece 311 and second contact piece 3
Both 12 have a flat plate shape, and a protruding piece 41 is cut and raised at a substantially central portion in the plane. The projecting pieces 46 and 47 formed on the second contact piece 312 are bent so as to project in mutually opposite directions. The terminal member 32 has a contact piece 321,
Protruding pieces 42 and 43 are provided at substantially the center of the plane. The protruding pieces 42 and 43 are bent so as to protrude in mutually opposite directions. The terminal member 33 has a contact piece 331, and projecting pieces 44 and 45 are provided in a substantially central portion in the surface thereof. The protrusions 44 and 45 are bent so as to protrude in mutually opposite directions. The terminal member 34 has a contact piece 341, and a projecting piece 48 is provided at a substantially central portion in the surface thereof.
Reference numerals 323 to 343 are terminal portions.

Piezoelectric resonators 21-24 and terminal members 31-
34 are stacked so as to form a ladder circuit and are arranged in the internal space 11. Piezoelectric resonator 21-24
Is preferably arranged so that at least the periphery is spaced from the inner wall surface of the internal space 11. Piezoelectric resonators 21 to 24 and terminal members 31 to 3 for forming a ladder circuit
The specific arrangement relationship of No. 4 is the first provided on the terminal member 31.
The piezoelectric resonator 21, the terminal piece 32, the piezoelectric resonator 22, the terminal piece 33, and the piezoelectric resonator 23 are inserted between the contact piece 311 and the second contact piece 312 in this order, and the second contact of the terminal member 31 is made. The terminal member 34 is inserted into the space between the piece 312 and the inner wall surface of the case 1, and the piezoelectric resonator 24 is inserted between the terminal member 34 and the second contact piece 312.
The terminal portions 323 to 343 of the terminal pieces 32 to 34 are drawn out of the case 1 and bent in the same direction along the outer surface of the case 1. As a result, a planar mounting type piezoelectric resonance component is obtained. Reference numeral 7 in FIG. 2 is a sealing resin. Although not shown, the number, arrangement and size of the piezoelectric resonators are arbitrary. The same applies to the terminal member.

As shown in the enlarged view of FIG. 4, the protrusions 41 to 48 are in contact with the electrodes 210 of the piezoelectric resonators 21 to 24, and the piezoelectric resonator 21 is in a region excluding the contact portions of the protrusions 41 to 48. ˜24 and the terminal members 31 to 34, a gap G1,
G2 has occurred. When an element utilizing the surface expansion vibration mode is selected as the piezoelectric resonators 21 to 24, the projecting pieces 41 to 48 contact the electrode 210 on the nodes generated on the surfaces of the piezoelectric resonators 21 to 24. In FIG. 4, reference numeral 200 is a piezoelectric ceramic body.

FIG. 5 is an electrical symbol diagram of the piezoelectric resonance component according to the present invention. The piezoelectric resonators 21 and 24 are series resonators, the piezoelectric resonators 22 and 23 are parallel resonators, the terminal portion 323 of the terminal member 32 is an output terminal, and the terminal portion 333 of the terminal member 33 is a ground terminal. Terminal portion 34
A ladder connection circuit having 3 as an input terminal can be obtained.

As described above, since the piezoelectric resonators 21 to 24 and the terminal members 31 to 34 are overlapped with each other to form a ladder circuit and arranged in the internal space, a case-accommodating ladder type piezoelectric resonance is provided. Parts are obtained.

Since the terminal members 31 to 34 are made of flat plate-shaped metal members and have the protruding pieces 41 to 48 cut and raised in the plane, the double bending structure and processing which have been essential in the past are unnecessary. . For this reason, it becomes thin and mass productivity improves.

The piezoelectric resonators 21 to 24 are piezoelectric ceramic body 20.
0 has electrodes 210 on both sides, and piezoelectric resonators 21 to
24 and the terminal members 31 to 34 are stacked so as to form a ladder circuit, and the projecting pieces 41 to 31 of the terminal members 31 to 34 are stacked.
48 contacts the electrodes 210 of the piezoelectric resonators 21 to 24, and in a region excluding the contact portions of the protruding pieces 41 to 48, the gap G1 is provided between the piezoelectric resonators 21 to 24 and the terminal members 31 to 34.
Since G2 is generated, the influence of the terminal member on the vibration modes of the piezoelectric resonators 21 to 24 can be minimized by the distance holding by the protruding pieces 41 to 48.

As the piezoelectric resonators 21 to 24, those of a normal type can be used, and the electrode 210 (see FIG. 4) attached to the piezoelectric ceramic body 200 is made of a Cu--Ni alloy, N.
It is also effective to use at least one of i-Cr alloy and Cr-Si alloy. Electrodes made of these alloys have excellent oxidation resistance, sulfidation resistance and corrosion resistance, and there is no room for silver migration. For this reason,
Electrodes 210 of piezoelectric resonators 21-24 and terminal members 31-3
It is possible to obtain a highly reliable piezoelectric resonance component that is less likely to cause poor contact with the piezoelectric resonance component.

Further, the electrode 210 formed of at least one of Cu-Ni alloy, Ni-Cr alloy and Cr-Si alloy has an appropriate electric resistance value when used as a filter, so that the piezoelectric vibration is effective. Since the Q value of the child is lowered, the group delay characteristic can be improved.
Therefore, the group delay characteristic can be improved without using a resistor.

FIG. 6 is a view showing another embodiment of the projecting piece used in the piezoelectric resonance component according to the present invention. In this embodiment, the pair of protrusions (42 and 43), (44 and 45), and (46 and 47) extend from mutually opposite directions.

FIG. 7 is an enlarged perspective view showing another example of the contact structure between the piezoelectric resonator and the terminal member. Paired lugs (42 and 43), (44 and 45) and (46 and 47)
In, the projecting pieces 42, 44 or 46 are arranged in the middle part, and the projecting pieces 43, 45 or 47 are arranged separately on both sides thereof.

FIG. 8 is a partial sectional view showing still another embodiment of the piezoelectric resonance component according to the present invention, and FIG. 9 is a sectional view taken along line A9-A9 of FIG. In this embodiment, the positioning means 91-91
With 94. The positioning means 91 to 94 are elastic resin or expandable elastic resin filled in the positions corresponding to the nodes generated around the piezoelectric resonators 21 to 24. As an example of such a resin, a silicon-based resin can be cited. Since the illustrated piezoelectric resonators 21 to 24 have a rectangular shape, a total of four nodes are formed in the widthwise intermediate portion and the lengthwise intermediate portion of the piezoelectric resonators 21 to 24. The positioning means 91 to 94 are formed by applying an elastic resin or a foamable elastic resin to each of these nodes and curing it. It is desirable that the application width of the elastic resin or the expandable elastic resin be formed as narrow as possible within a range in which necessary mechanical strength can be secured.

Since the positioning means 91 to 94 are made of elastic resin or expandable elastic resin filled in the space, the elastic resin or expandable elastic resin is in close contact with the piezoelectric resonators 21 to 24 and the terminal members 31 to 34. , Piezoelectric resonators 21-2
4 and the terminal members 31 to 34 can be surely prevented from being displaced and illegally arranged.

Further, externally applied vibrations and drop impacts are absorbed by the elasticity of the elastic resin or the foamable elastic resin forming the positioning means 91 to 94, and the piezoelectric resonators 21 to.
It is possible to reliably prevent the positional deviation and the improper arrangement of the terminal 24 and the terminal members 31 to 34.

Further, since the positioning means 91 to 94 are filled at the positions corresponding to the nodes generated in the peripheral portions of the piezoelectric resonators 21 to 24, the positioning means 91 to 94 are provided.
It is possible to minimize vibration disturbance to the piezoelectric resonators 21 to 24 due to.

FIG. 10 is a partial cross-sectional view showing still another embodiment of the piezoelectric resonance component according to the present invention, and FIG. 11 is A11 of FIG.
-It is sectional drawing on the A11 line. Positioning means 91-93
Is a protrusion that is provided within the interval along the stacking direction of the piezoelectric resonators 21-24 and the terminal members 31-34, including the positions corresponding to the nodes generated in the peripheral portions of the piezoelectric resonators 21-24. The positioning means 91 to 93 may be formed in the same body as the case 1, or may be a component separate from the case 1 and assembled at a predetermined position. Further, it is desirable that the width be formed as narrow as possible within a range in which necessary mechanical strength can be secured.

With the above structure, the positioning means 91-9
3, the piezoelectric resonators 21 to 24 and the terminal members 31 to 3
It is possible to surely prevent the positional deviation and the improper arrangement of No. 4. In addition, the positioning means 91-94 are provided with the piezoelectric resonators 21-24.
Since the piezoelectric resonator 21 is arranged at a position corresponding to a node generated in the peripheral portion of the piezoelectric resonator 21 by the positioning means 91 to 94.
Vibration disturbances to ~ 24 can be minimized.

In the embodiment, the case 1 has an opening on one end side when viewed in the width direction, and the piezoelectric resonators 21 to 24 are provided.
And the terminal members 31 to 34 are passed through the openings to form the case 1
It is designed to be inserted inside. Under such a structure, the positioning means 91 to 93 are arranged on one end side in the lateral width direction on the side opposite to the opening side and on both sides in the longitudinal width direction. Therefore, the piezoelectric resonators 21 to 24 are provided in the case 1.
And the piezoelectric resonator 2 only by inserting the terminal members 31 to 34.
1 to 24 are subjected to the positioning action by the positioning means 91 to 93. Unlike the embodiment, the positioning means 91 to 9
3 can also be arranged at one end side in the lateral width direction opposite to the opening side and one end side in the longitudinal width direction. Also in this case,
The piezoelectric resonators 21 to 24 can be positioned at predetermined positions in the case 1.

FIG. 12 is a partial sectional view showing still another embodiment of the piezoelectric resonance component according to the present invention, and FIG. 13 is A13 of FIG.
It is a cross-sectional view taken along the line A13. In this embodiment, among the plurality of piezoelectric resonators 21 to 24 provided, the piezoelectric resonators 21 and 24 are smaller in horizontal width and vertical width than the piezoelectric resonators 22 and 23 by dimensional differences d1 and d2. Further, on the side facing the piezoelectric resonators 21 to 24 and the terminal members 31 to 34, step portions a and b having steps corresponding to the dimensional differences d1 and d2 of the horizontal width or the vertical width are provided. The steps a and b control the nodes generated on the surfaces of the piezoelectric resonators 21 to 24 in a direction in which the piezoelectric resonators coincide with each other. Positioning means 9
1 to 93 may be formed integrally with the case 1, or may be separate parts from the case 1 and assembled at predetermined positions. Further, it is desirable that the width be formed as narrow as possible within a range in which necessary mechanical strength can be secured.

Of the plurality of piezoelectric resonators 21 to 24 provided, the piezoelectric resonators 21 and 24 are smaller in width and length than the piezoelectric resonators 22 and 23 by the dimensional differences d1 and d2. Depending on the size of the children 21 to 24, high selectivity can be achieved and group delay characteristics can be improved.

The positioning means 91 to 93 are the piezoelectric resonator 2
1 to 24 and the terminal members 31 to 34 along the stacking direction, the case 1, the piezoelectric resonators 21 to 24, and the terminal members 31 to 34.
And stepped portions a and b having a step corresponding to the dimensional differences d1 and d2 in horizontal and vertical widths are provided on the side facing the piezoelectric resonators 21 to 24 and the terminal members 31 to 34, respectively. ,
The step portions a and b control the nodes generated on the surfaces of the piezoelectric resonators 21 to 24 in a direction in which the piezoelectric resonators coincide with each other. Therefore, the piezoelectric resonators 21 and 24 and the piezoelectric resonators 22 and 23 having different sizes are controlled. , The nodes generated on the surfaces of the piezoelectric resonators 21 to 24 can be reliably matched.
Therefore, it is possible to prevent fluctuations in resonance impedance and generation of unnecessary vibration modes, and obtain desired characteristics. Further, the positioning means 91 to 93 prevent the piezoelectric resonators 21 to 24 and the terminal members 31 to 34 from being displaced due to vibrations applied from the outside or a drop impact, and the piezoelectric resonators 21 to 31.
It is possible to reliably prevent the positional deviation and the improper arrangement of the terminal 24 and the terminal members 31 to 34.

Also in the embodiment shown in FIGS. 8 to 13, the terminal members 31 to 34 are made of flat metal members and have the protruding pieces 41 to 48 cut and raised in the plane, and the piezoelectric resonance 21.
˜24 and the terminal members 31 to 34 are stacked so as to form a ladder circuit and arranged in the internal space 11, and the projecting pieces 41 to 48 of the terminal members 31 to 34 are the piezoelectric resonators 21 to 24.
Of the piezoelectric resonators 21 to 24 and the terminal members 31 to 3 in a region which contacts the electrodes of the protrusions 41 to 48 except the contact portions.
Since there is a gap between the four, the same effect as the embodiment shown in FIGS. 1 to 5 can be obtained.

[0035]

As described above, according to the present invention, the following effects can be obtained. (A) A case-type ladder-type piezoelectric resonance component can be provided. (B) It is possible to provide a piezoelectric resonance component which is thin and has high mass productivity. (C) It is possible to provide a piezoelectric resonance component that can minimize the influence of the terminal member on the vibration mode of the piezoelectric resonator.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a piezoelectric resonance component according to the present invention.

FIG. 2 is a partial front sectional view of a piezoelectric resonance component according to the present invention.

3 is a cross-sectional view taken along the line A3-A3 in FIG.

FIG. 4 is an enlarged cross-sectional view showing a contact structure between a piezoelectric resonator and a terminal member.

FIG. 5 is an electrical symbol diagram of the piezoelectric resonance component according to the present invention.

FIG. 6 is an enlarged cross-sectional view showing another example of the contact structure between the piezoelectric resonator and the terminal member.

FIG. 7 is an enlarged perspective view showing another example of the contact structure between the piezoelectric resonator and the terminal member.

FIG. 8 is a partial sectional view showing still another embodiment of the piezoelectric resonant component according to the present invention.

9 is a cross-sectional view taken along the line A9-A9 of FIG.

FIG. 10 is a partial sectional view showing still another embodiment of the piezoelectric resonant component according to the present invention.

11 is a cross-sectional view taken along the line A11-A11 of FIG.

FIG. 12 is a partial sectional view showing still another embodiment of the piezoelectric resonant component according to the present invention.

13 is a cross-sectional view taken along the line A13-A13 of FIG.

[Explanation of symbols]

 1 Case 11 Internal Space 21-24 Piezoelectric Resonator 31-34 Terminal Member 41-48 Projecting Piece

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasunobu Oikawa 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Inc. (72) Inventor Satoshi Satoshi 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Within the corporation

Claims (2)

[Claims] 1. A piezoelectric resonance component including a case, a plurality of piezoelectric resonators, and a plurality of terminal members, wherein the case has an internal space, and the piezoelectric resonator is a piezoelectric ceramic element. It has electrodes on both sides of the body, the terminal member is a plate-shaped metal member, and has a protruding piece cut and raised in the plane, the piezoelectric resonator and the terminal member, a ladder circuit Are arranged in the internal space in such a manner that the protruding pieces of the terminal member come into contact with the electrodes of the piezoelectric resonator, and the piezoelectric resonator is provided in a region excluding a contact portion of the protruding piece. And a piezoelectric resonance component in which a gap is created between the terminal members. 2. The piezoelectric resonator is a flat-plate element that utilizes a surface-spreading vibration mode, and the terminal member contacts the electrode at a node where the projecting piece occurs on the surface of the piezoelectric resonator. The piezoelectric resonant component according to claim 1.