JPH0195617A - Multi-element type piezoelectric component - Google Patents

Abstract

PURPOSE:To attain miniaturization, to improve the mechanical strength and to form air gap in an excellent way by pilling up >=2 sheets of piezoelectric substrates in one body while clipping an intermediate metallic plate, and using the intermediate metallic plate whose middle part is removed or an end face metallic plate whose middle part is concaved outward. CONSTITUTION:A 2-element type piezoelectric component 1 has two piezoelectric substrates 2, 3, the piezoelectric substrates 2, 3 are stacked by clipping the intermediate metallic plate 4 inbetween, the end face metallic plates 5, 6 are stacked at both end faces, made in one body by a resin case 7 and covered by a resin outer package 8. Vibrating electrodes 2a, 3a are formed in the piezoelectric substrates 2, 3 at the middle part of both faces and connection electrodes 2b, 3b are formed to the circumferential part, and each of them forms one piezoelectric resonator. Since the two piezoelectric substrates 2, 3 are stacked in the 2-element piezoelectric component 1, the area is not increased in size and since the thickness is originally so thick, the thickness is not a problem even when the substrates are stacked. Thus, the entire is constituted small in size and made rugged mechanically and the air gap is formed suitably to the vibrating part of the piezoelectric substrates.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a multi-element piezoelectric component, and more specifically,
The present invention relates to a multi-element piezoelectric component in which the above piezoelectric elements are assembled into one package.

[Conventional technology]

When configuring a trap circuit using piezoelectric elements, for example, two or more piezoelectric elements are connected to obtain a large damping force.

For this reason, a piezoelectric component as shown in FIG. 5 is conventionally known.

The piezoelectric component 51 shown in FIG. 5 has two vibrating parts 53 and 54 formed on one piezoelectric substrate, and has lead terminals 56, 57 and 58 protruding from the piezoelectric component 51, and is covered with a resin sheath 55. .

[Problem that the invention seeks to solve]

As described above, when a plurality of vibrating parts are formed on one piezoelectric substrate, the area of the piezoelectric substrate becomes large and there is a problem that miniaturization is not possible. In addition, there is a problem that mechanical strength decreases, such as the possibility of cracking.

Furthermore, in order to prevent the vibration of the piezoelectric substrate from being inhibited by the resin exterior, it is necessary to provide a gap near the vibrating part, but there is a problem in that it is difficult to form such a gap well.

Therefore, an object of the present invention is to provide a multi-element type piezoelectric component that can be miniaturized, has excellent mechanical strength, and can form voids well.

[Means for solving problems]

The multi-element piezoelectric component of the present invention has two or more piezoelectric substrates each having a vibrating electrode formed in the center and a connecting electrode formed in the periphery of both sides, with the center removed and only the periphery contacting the piezoelectric substrate. The piezoelectric substrate is stacked with intermediate metal plates that can be used in between, and the end metal plates that are recessed outward in the center and that can contact the piezoelectric substrate only at the periphery are stacked on the piezoelectric substrate surfaces that serve as both end surfaces, and the whole is integrated with resin. A characteristic feature of its composition is that it has been

[Effect]

In the multi-element piezoelectric component of the present invention, two or more piezoelectric substrates are stacked and integrated with an intermediate metal plate in between. For this reason, the area of a single piezoelectric substrate does not increase.On the other hand, although the thickness increases, it is not a problem at all because the thickness is small to begin with.
Rather, it has the advantage of increased mechanical strength.

Therefore, the piezoelectric component is small and has excellent mechanical strength.

Furthermore, there is an intermediate gold plate with the central part removed.

Since the end metal plate whose central portion is recessed outward is used, it is possible to easily form a good gap.

〔Example〕

Hereinafter, the present invention will be explained in more detail based on embodiments shown in the drawings. Here, FIG. 1 is a conceptual cross-sectional view of a two-element piezoelectric component according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the main elements of the two-element piezoelectric component shown in FIG. 1, and FIG. is a conceptual perspective view of the two-element piezoelectric component shown in FIG. 1, and FIG.
FIG. 2 is a circuit diagram of the two-element piezoelectric component shown in the figure. Note that the present invention is not limited to the embodiments shown in the figures.

FIG. 1 is a conceptual cross-sectional view of a two-element piezoelectric component according to the present invention.

In other words, the two-element piezoelectric component 1 includes two piezoelectric substrates 2.3.
The piezoelectric substrates 2.3 are stacked with an intermediate metal plate 4 in between, and end metal plates 5.6 are stacked on both end faces. Then, it is integrated with a resin case 7 and further covered with a resin outer device.

As shown in FIG. 2, the piezoelectric substrate 2.3 has vibrating electrodes 2m, 3m formed in the center of both sides, and connecting electrodes 2b, 3I formed in the peripheral areas, each of which has one It becomes a piezoelectric resonator.

The intermediate metal plate 4 has a punched hole 41 in the center, contacts the piezoelectric substrates 2 and 3 only at the peripheral portions, and forms lead terminals 4I.

Therefore, by stacking the piezoelectric substrates 2.3 with the intermediate metal plate 4 in between, the two piezoelectric resonators are connected in series.

The end metal plate 5.6 has recesses 5m and 6m in the center,
It contacts the piezoelectric substrate 2.3 only at the periphery, and has lead terminals 5b, 6+ formed therein.

and recessed portion 5. ．． 6. the piezoelectric substrate 2 with the
, 3 are overlapped.

The resin case 7 positions each element when the above stacking is performed, and is heated and deformed to
Integrate the whole as if it were crimped together.

FIG. 3 shows this state.

The resin outer device covers the entire device for protection.

Now, this two-element type piezoelectric component 1 consists of two piezoelectric substrates 2.
3 is stacked on top of each other, so the area does not become large, and
Since they are originally thin, the thickness does not matter when stacked, and the entire structure can be made compact. It also becomes mechanically stronger. Furthermore, since a gap is suitably formed in the vibrating part of the piezoelectric substrate 2.3 by the punched hole 41 of the intermediate metal plate 4 and the recesses 5□, 61 of the end metal plate 5.6, manufacturing is facilitated.

Note that it is easy to configure a piezoelectric component with three or more elements, and the above advantages become more significant as the number of elements increases.

〔Effect of the invention〕

According to the present invention, two or more piezoelectric substrates each having a vibrating electrode formed in the center part and a connecting electrode formed in the peripheral part of both sides are made of an intermediate metal whose central part is removed and only the peripheral part can contact the piezoelectric substrate. The piezoelectric substrate is stacked with plates sandwiched in between, and the piezoelectric substrate that forms both end surfaces is stacked with an end metal plate whose central part is concave outward and only the peripheral part can contact the piezoelectric substrate, and the whole is integrated with resin. A multi-element type piezoelectric component with characteristics is provided, and a multi-element type piezoelectric component that is small in size, durable, and easy to manufacture can be obtained by removing.

[Brief explanation of the drawing]

FIG. 1 is a conceptual cross-sectional view of a two-element piezoelectric component according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the main elements of the two-element piezoelectric component shown in FIG. 1, and FIG. FIG. 1 is a conceptual perspective view of the two-element piezoelectric component shown in FIG. 1, FIG. 4 is a circuit diagram of the two-element piezoelectric component shown in FIG. 1, and FIG. 5 is a conceptual diagram of the structure of a conventional piezoelectric component. [Explanation of symbols] 1... Two-element type piezoelectric component 2.3... Piezoelectric substrate 2, . 3m... Vibrating electrodes 2b, 3b... Connection electrode 4... Intermediate metal plate 41... Punching holes 5.6
... End metal plate 5m, 6m ... Recess 7 ... Resin case 8 ... Resin exterior. Applicant: Zaiyo Seisakusho Co., Ltd.

Claims (1)

[Claims] 1. Two or more piezoelectric substrates each having a vibrating electrode formed in the center and a connecting electrode formed in the periphery of both sides are stacked with an intermediate metal plate in between, the center of which has been removed and only the periphery of which can contact the piezoelectric substrate. The multi-element type is characterized in that the piezoelectric substrate surface, which is the end surface, is overlaid with end metal plates whose central part is recessed outward and only the peripheral part can contact the piezoelectric substrate, and the whole is integrated with resin. Piezoelectric components.