JPH06237138A - Piezoelectric resonance component - Google Patents

Abstract

PURPOSE:To provide the piezoelectric resonance component comparatively inexpensively on which the effect of thermal contraction and secular change of an outer package resin is hardly caused. CONSTITUTION:In the piezoelectric component 11 comprising a resonator element 2 in which an electrode 4 extended from one end of one major side of two front and rear major sides of a piezoelectric substrate and an electrode 5 extended from the other end of the other major side are formed to be partly opposite to each other, terminals 12, 13 in electrically continuity with each electrode 4(5) of the resonator element 2, and an outer package resin 14 sealing the resonator element 2 while forming a vibration cavity 15 in a vibration part formed by the opposed part of the electrodes 4 (5), it is featured that the terminals 12, 13 are extended along the piezoelectric substrate and almost surround the piezoelectric substrate.

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 in which a resonator element is sandwiched between terminals, resin-dipped, and sealed with an exterior resin. The present invention relates to a piezoelectric resonance component including a vibration mode resonator element.

[0002]

2. Description of the Related Art Conventionally, there is a piezoelectric resonance component having a structure shown in FIG. 6 in which a resonator element is sandwiched between terminals and formed by resin dipping. In FIG. 6, reference numeral 1 is a piezoelectric resonance component. This piezoelectric resonance component 1 is composed of a resonator element 2, cup-shaped terminals 6 and 7, and an exterior resin 9 on the outer surface. As shown in FIG. 5, the resonator element 2 is provided with an electrode 4 extending from one end side to a central portion on one main surface (front surface) of a rectangular piezoelectric substrate 3 made of piezoelectric ceramic, and the other main surface. The electrode 5 is provided on the (rear surface) so as to extend from the other end side to the central portion,
The parts are formed so as to face each other. Then, the resonator element 2 is sandwiched between the cup-shaped terminals 6 and 7 from both sides and soldered, and wax is applied to the vibrating portions of the electrodes 4 and 5 facing each other. Next, the resonator element 2 is dipped in resin to cover the outer surface thereof, and the outer surface of the resonator element 2 is baked to form the exterior resin 9 to seal the resonator element 2. At the time of this baking, the wax is melt-impregnated into the exterior resin 9,
As a result, the vibrating cavity 8 is formed in the vibrating portions of the electrodes 4 and 5 facing each other.

[0003]

In order to increase the frequency of the above-mentioned piezoelectric resonance component to 6.5 MHz or more, the size of the resonator element must be reduced, but the smaller the size, the smaller the strength. In the energy trap type thickness shear vibration mode resonator element as described above, the direction of the polarization axis is normally set to the P direction as shown in FIG. The exterior resin 9 of the piezoelectric resonance component 1 thermally contracts during cooling after baking and changes with time. Since the larger the contraction amount is, the larger the force F acts in the direction parallel to P as shown in FIG. 6 to deteriorate the temperature characteristics and electrical characteristics of the resonator element. Therefore, in order to solve this problem, as shown in FIG. 7, after mounting the resonator element 2 on the insulating substrate 10 and soldering or bonding with a conductive adhesive or the like to form the reinforcing element 1a, the insulating substrate It is proposed that the terminals 10 are sandwiched by the terminals from both ends. However, the structure in which the resonator element 2 is mounted on the insulating substrate 10 has a problem that the manufacturing process is complicated and the cost is increased.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a piezoelectric resonance component which is less susceptible to the thermal shrinkage of the exterior resin and the change over time at a relatively low cost. I am trying.

[0005]

In a piezoelectric resonance component according to the present invention, an electrode extending from one end of one main surface of the front and back 2 main surfaces of the piezoelectric substrate and an electrode extending from the other end of the other main surface are partially formed. A resonator element formed so as to face each other, a terminal electrically connected to each electrode of the resonator element, and a cavity for vibration formed in a vibrating portion formed at a portion where the electrodes face each other. In a piezoelectric resonance component made of an exterior resin for encapsulating, the terminal is provided with an extension extending along the piezoelectric substrate, and both terminals are arranged so that the extension surrounds the piezoelectric substrate.

[0006]

The piezoelectric resonance component of the present invention comprises a resonator element, a pair of terminals, an exterior resin and the like. The resonator element is formed by providing an electrode extending from one end side of each main surface of the front and back surfaces of the piezoelectric substrate and an electrode extending from the other end side of the other main surface so as to partially oppose each other. An extension is provided so that each terminal extends along the piezoelectric substrate, and the ends of the extension are brought close to each other. Then, the piezoelectric resonance component is manufactured as follows. First, the resonator element is arranged and held along the extension of the terminal, the electrode is electrically connected to the terminal, and the resonator element is bonded by solder or conductive paste. Then, a wax for forming a cavity for vibration is applied to the vibrating portion formed in a portion where the electrodes of the resonator element face each other, and then the exterior resin is dipped in the molten resin. Form and seal the resonator element. Wax is melted and impregnated in the exterior resin by baking and curing the exterior resin to form a cavity in the vibrating portion, and a piezoelectric resonance component is manufactured. As described above, since the terminal is simply provided with the extended portion extending along the piezoelectric substrate, the piezoelectric resonance component can be manufactured at a relatively low cost. Further, since the resonator element is arranged so as to surround the resonator element by the extension portion of the pair of terminals, the resonator element is strengthened by the terminal and the amount of the exterior resin can be reduced, so that it is less susceptible to thermal contraction and aging. . The bending strength of the piezoelectric resonance component can be further increased by forming the end face of the extension portion in a curved shape in the direction perpendicular to the longitudinal axis of the extension portion.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings by taking a piezoelectric resonance component composed of a resonator element of an energy trapping type thickness shear vibration mode as an example. The same reference numerals are given to the parts corresponding to the above conventional example. 1 to 3 are views for explaining a first embodiment of a piezoelectric resonance component according to the present invention. In the figure, 11 is a piezoelectric resonance component,
This piezoelectric resonance component 11 includes a resonator element 2 and terminals 12 and 13 connected to electrodes 4 and 5 of the resonator element 2, respectively.
And the exterior resin 14 on the outer surface, and a cavity 15 is formed in the vibrating portion. The resonator element 2 is constructed as shown in FIG. 5, and the terminals 12 and 13 are respectively extended portions 16 and
Have 17. The extension portions 16 and 17 extend along and surround the resonator element 2.

As shown in FIG. 2, the terminal 12 is made of a plate-shaped material and has an extension portion 16 and a lead portion 18. A groove 16a for mounting the resonator element 2 is provided in a main body portion extending in the longitudinal direction of the extension portion 16, and a holding portion 16b having a step for mounting and supporting the resonator element 2 is provided at an end portion of the groove. ing. A notch 16c is provided at the center of the end of the extension 16 along the groove 16a, and the end face is formed in a curved shape in the direction perpendicular to the longitudinal direction. The lead portion 18 is formed integrally with the extension portion 16 and extends in the direction perpendicular to the longitudinal direction. Like the terminal 12, the terminal 13 has an extension portion 17 and a lead portion 19. A groove 17a for mounting the resonator element 2 is provided in the main body of the extension portion 17, and a holding portion 17b having a step for mounting and supporting the resonator element 2 is provided at the end of the groove. A projecting portion 17c projecting in the longitudinal direction is provided at the center of the end portion of the extension portion 17, and the end face is formed in a curved shape in the direction perpendicular to the longitudinal direction corresponding to the notch 16c of the extension portion 16 of the terminal 12. The lead portion 19 is formed integrally with the extension portion 17,
It extends in the direction perpendicular to the longitudinal direction. Then, the gaps between the facing end faces of the extension 16 and the extension 17 are set to G1, G2, G
When set to 3, this gap is set to about 1.0 mm or smaller.

A method of manufacturing the piezoelectric resonance component 11 of the above embodiment will be described below with reference to FIG. First, the resonator element 2 is prepared, and the terminals 12 and 13 are manufactured as described above. The step between the holding portions 16b and 17b is formed by half etching, press molding or the like. Then
As shown in FIG. 3, the resonator element 2 is held by the holding portions 16b and 17b of the terminals 12 and 13, respectively, and is bonded to the electrodes 4 and 5 by soldering, a conductive adhesive 20, or the like. At this time, the gap between the terminal ends of the terminals 12 and 13 is set to a small value of 1.0 mm or less. Next, wax 21 is applied by drip or the like in order to form a cavity in the vibrating portion of the resonator element 2, and the molten resin layer is dipped and coated with the resin. This resin is dried, baked and cured to form the exterior resin 14, and the resonator element 2 is sealed. At the same time, the exterior resin 14 is melt-impregnated with wax to form the cavity 15, thereby obtaining the piezoelectric resonance component 11. .

According to this embodiment, since the terminals 12 and 13 are provided with only the extension portions 16 and 17 extending along the resonator element 2, the piezoelectric resonance component can be manufactured at a relatively low cost. Further, since the terminals 12 and 13 are arranged so as to surround the resonator element 2 with the extension portion, the resonator element 2 is strengthened and the amount of the exterior resin 14 can be reduced, so that the resonator element 2 can be reduced.
Can be less susceptible to the shrinkage of the exterior resin and the change over time. As a result, the reliability of the product can be improved. The bending strength of the piezoelectric resonance component can be further increased by forming the end face of the extension portion in a curved shape in the direction perpendicular to the longitudinal axis of the extension portion.

In the above embodiment, the resonator element is mounted on the plate-shaped terminal, but the present invention is not limited to the above embodiment. For example, the terminal is composed of a pair of cup-shaped terminals 22 and 23 as shown in FIG.
2 and 23 are extended portions 24 and 25 and lead portion 2 respectively.
You may form so that it may consist of 6,27. Then, using the cup-shaped terminals 22 and 23, the resonator element 2 of FIG.
Is provided so as to surround it, and a cavity is provided and sealed with an exterior resin to manufacture a piezoelectric resonance component. The shape of the opposing end faces of the ends of the cup-shaped terminals 22 and 23 may be curved in the direction perpendicular to the longitudinal direction as in the above embodiment. In addition, the present invention is not limited to the above embodiments, such as the shape of the terminal and the vibration mode of the resonator. The point is that the terminal may be provided with an extension extending in the longitudinal direction of the resonator element.

[0012]

As described above, according to the piezoelectric resonance component of the present invention, since the terminal is only provided with the extended portion extending along the resonator element, the piezoelectric resonance component can be manufactured relatively inexpensively. Further, since both terminals are arranged so as to surround the resonator element with the extension portion, it is possible to reduce the influence of shrinkage and temporal change of the exterior resin with respect to the piezoelectric resonance component.

[Brief description of drawings]

FIG. 1 is a front view illustrating an embodiment of a piezoelectric resonance component according to the present invention.

FIG. 2 is a perspective view illustrating a terminal of the above embodiment.

FIG. 3 is a diagram illustrating a method of manufacturing the piezoelectric resonance component of the above-described embodiment.

FIG. 4 is a perspective view illustrating a terminal of another embodiment of the present invention.

FIG. 5 is a perspective view illustrating a resonator element.

FIG. 6 is a perspective view illustrating a conventional piezoelectric resonance component.

FIG. 7 is a perspective view illustrating an example of another conventional piezoelectric resonance component.

[Explanation of symbols]

 2 Resonator element 3 Piezoelectric substrate 4,5 Electrode 11 Piezoelectric resonance component 12, 13 Terminal 14 Exterior resin 15 Cavity 16,17 Extension 16a, 17a Groove 16b, 17b Holding 16c Cutout 17c Projection 18,19 Lead 20 Conductive adhesive 21 Wax 22,23 Cup-shaped terminals 24,25 Extensions 26,27 Leads

Claims (1)

[Claims] 1. A resonator element, wherein an electrode extending from one end of one main surface of the front and back 2 main surfaces of a piezoelectric substrate and an electrode extending from the other end of the other main surface are partially opposed to each other. ,
A piezoelectric resonance component comprising a terminal electrically connected to each electrode of the resonator element and an exterior resin for sealing the resonator element by forming a cavity for vibration in a vibrating portion formed at a portion where the electrodes face each other, A piezoelectric resonance component characterized in that terminals are extended along a piezoelectric substrate so that both terminals substantially surround the piezoelectric substrate.