JP3290736B2 - Piezoelectric resonance components - Google Patents

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, and in particular, a high-frequency energy-trapping type thickness slip of 6.5 MHz or more. The present invention relates to a piezoelectric resonance component including a resonator element in a vibration mode.

[0002]

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

[0003]

In order to increase the frequency of the above-described piezoelectric resonance component to 6.5 MHz or more, the dimensions of the resonator element must be reduced. However, when the size is reduced, the strength decreases. Further, in the above-described resonator element of the energy trapping type thickness shear vibration mode, the direction of the polarization axis is usually set to the P direction as shown in FIG. The exterior resin 9 of the piezoelectric resonance component 1 undergoes thermal contraction during cooling after baking and changes with time. Since the larger the size, the larger the amount of shrinkage, a large force F acts in a direction parallel to P as shown in FIG. 6, thus deteriorating the temperature characteristics and electrical characteristics of the resonator element. Therefore, in order to solve this problem, as shown in FIG. 7, the resonator element 2 is placed on the insulating substrate 10 and soldered, bonded with a conductive adhesive or the like to form the reinforcing element 1a. There are proposed ones in which terminals are held between both ends of the cable. 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 of the present invention is to provide a piezoelectric resonance component which is hardly affected by heat shrinkage and aging of an exterior resin at a relatively low cost. And

[0005]

According to the piezoelectric resonance component of the present invention, the direction of the polarization axis of the rectangular piezoelectric substrate is set to the longitudinal direction of the piezoelectric substrate, and one of the two principal surfaces of the front and back surfaces of the piezoelectric substrate is formed. A resonator element of an energy trap type thickness shear vibration mode in which an electrode extending from one end to the center and an electrode extending from the other main surface to the center are partially opposed to each other. And a pair of terminals electrically connected to the respective electrodes of the resonator element, and an exterior resin for sealing the resonator element by forming a vibration cavity in a vibrating portion formed at a portion facing the electrode. Wherein the pair of terminals extend along the piezoelectric substrate, and both terminals form the piezoelectric substrate in a plane or three-dimensional manner so as to surround substantially the entire circumference. According to a second aspect of the present invention, in the piezoelectric resonance component of the first aspect, both terminals have a lead portion and an extension portion, respectively.
The extension extends along the piezoelectric substrate and is formed to substantially surround the piezoelectric substrate, and the extension has a groove for mounting the piezoelectric substrate, and an end of the groove is formed at an end of the groove. A holding portion for supporting the piezoelectric substrate is formed, and a gap is provided between opposing end surfaces of the extension portions of the two terminals, and the lead portions of the two terminals extend in a direction perpendicular to the longitudinal direction of the extension portion. ing. According to a third aspect of the present invention, in the piezoelectric resonance component according to the second aspect, notches are formed at positions corresponding to each other at ends of the extended portions of both terminals.

[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 of each of the front and back main surfaces of the piezoelectric substrate and an electrode extending from the other end of the other main surface so as to partially face each other. Extensions that each terminal extending along the piezoelectric substrate is provided, to approach the end of this extension, and both
The terminal is used to enclose the piezoelectric substrate in a plane or three-dimensional shape.
Create so that you can . Then, a piezoelectric resonance component is manufactured as follows. First, the resonator element is arranged and held along the extension of the terminal, the electrode is made conductive to the terminal, and the resonator element is bonded with solder or conductive paste or the like. Next, after applying a wax for forming a cavity for vibration so as not to hinder the vibration to the vibrating portion formed at a portion where the electrodes of the resonator element are opposed to each other, the outer resin is formed by dipping in a molten resin. And sealing the resonator element. By baking and curing the exterior resin, the wax is melt-impregnated in the exterior resin to form a cavity in the vibrating part, thereby manufacturing a piezoelectric resonance component. As described above, since only the terminal is provided with the extension extending along the piezoelectric substrate, the piezoelectric resonance component can be manufactured relatively inexpensively. In addition, since the resonator element is arranged so as to surround the extension part of the pair of terminals, the resonator element is strengthened by the terminals, the amount of the exterior resin can be reduced, and the influence of heat shrinkage and aging can be reduced. . In addition, the end of the extension is used to support the piezoelectric substrate.
By providing a groove in which a holding portion is formed, a piezoelectric resonance portion is provided.
Reduce the effects of shrinkage of exterior resin and external impact
Can be supported. As a result, the strength of the piezoelectric
Can be strengthened. Further, at the ends of the extension portions of both terminals,
By forming notches at the positions corresponding to each other,
The pendulum element can be reliably supported, and the piezoelectric
Can be improved in strength. Furthermore, when the end face of the extension is formed in a curved shape in a direction perpendicular to the longitudinal axis of the extension,
The bending strength of the piezoelectric resonance component can be further increased.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described with reference to the drawings, taking a piezoelectric resonance component comprising a resonator element of an energy trap type thickness shear vibration mode as an example. Parts corresponding to the above-mentioned conventional example are denoted by the same reference numerals. 1 to 3 are views for explaining a first embodiment of the piezoelectric resonance component according to the present invention. In the figure, reference numeral 11 denotes a piezoelectric resonance component;
The 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 an exterior resin 14 on the outer surface, and a cavity 15 is formed in the vibrating portion. This resonator element 2 is configured as shown in FIG. 5, and terminals 12 and 13 are
17. Extensions 16 and 17 extend along the resonator element 2 to surround it.

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

Hereinafter, a method of manufacturing the piezoelectric resonance component 11 of the above embodiment will be described with reference to FIG. First, the resonator element 2 is prepared, and the terminals 12 and 13 are manufactured as described above. The steps of the holding portions 16b and 17b are 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, and the like. At this time, the gap between the terminal of the terminal 12 and the terminal 13 is set to be as small as 1.0 mm or less. Next, a wax 21 is applied by drip or the like to form a cavity in the vibrating portion of the resonator element 2, and is dipped into a molten resin layer to cover the resin. This resin is dried and baked and cured to form the exterior resin 14, and the resonator element 2 is sealed. At the same time, the cavity 15 is formed by melting and impregnating the exterior resin 14 with wax to obtain the piezoelectric resonance component 11. .

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

Although the above embodiment has been described with reference to an example in which a resonator element is mounted on a plate-shaped terminal, the present invention is not limited to the above embodiment. For example, as shown in FIG. 4, the terminals are composed of a pair of cup-shaped terminals 22 and 23, and
2 and 23 are extended portions 24 and 25 and lead portion 2 respectively.
6 and 27 may be formed. Then, the resonator element 2 shown in FIG.
Are enclosed so as to surround them, and a cavity is provided and sealed with an exterior resin to manufacture a piezoelectric resonance component. Note that the shape of the end faces of the cup-shaped terminals 22 and 23 facing the terminal ends may be curved in the direction perpendicular to the longitudinal direction as in the above-described embodiment. In addition, the present invention is not limited to the above embodiment, such as the shape of the terminal and the vibration mode of the resonator. In short, it is sufficient if the terminal has 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 only the terminal is provided with the extension extending along the resonator element, the piezoelectric resonance component can be manufactured relatively inexpensively. In addition, since both terminals are arranged so as to surround the resonator element with the extension part, it is possible to reduce the influence of the shrinkage of the package resin and the change with time on the piezoelectric resonance component. Of the present invention
According to the piezoelectric resonance component of the second aspect, the piezoelectric resonance component is externally mounted.
Support to reduce the effects of resin shrinkage and external impact.
I can have. As a result, the strength of the piezoelectric resonance component can be further enhanced.
Wear. Further, according to the piezoelectric resonance component of claim 3 of the present invention,
Therefore, in addition to the effects of the first and second aspects, a more reliable resonator element can be obtained.
To improve the strength of piezoelectric resonance components.
Can be

[Brief description of the 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 embodiment.

FIG. 3 is a diagram illustrating a method for manufacturing the piezoelectric resonance component of the embodiment.

FIG. 4 is a perspective view illustrating a terminal according to 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 Resonant Component 12, 13 Terminal 14 Outer Resin 15 Cavity 16, 17 Extension 16a, 17a Groove 16b, 17b Holder 16c Notch 17c Projection 18, 19 Lead 20 Conductive adhesive 21 Wax 22, 23 Cup-shaped terminal 24, 25 Extension 26, 27 Lead

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 4-87622 (JP, U) JP-A 4-48717 (JP, U) JP-A 4-27620 (JP, U) JP-A 3- 421 (JP, U) Jiko 1-24978 (JP, Y2)

Claims (3)

(57) [Claims] An electrode extending from one end of one of the two main surfaces of the front and back surfaces of the rectangular piezoelectric substrate to a central portion thereof, and a polarization axis of the rectangular piezoelectric substrate is oriented in a longitudinal direction of the piezoelectric substrate. And a pair of energy-trapped-thickness-shear-vibration-mode resonator elements formed so as to partially face electrodes extending from the other end to the center of the resonator element. And a piezoelectric resonance component formed of an exterior resin for sealing a resonator element by forming a vibration cavity in a vibrating portion formed at a portion facing the electrode, wherein the pair of terminals are disposed on a piezoelectric substrate. A piezoelectric resonance component characterized in that the piezoelectric substrate is formed so as to extend substantially along the entire periphery of the piezoelectric substrate in a planar or three-dimensional manner. 2. The two terminals each having a lead portion and an extension portion, wherein the extension portion extends along the piezoelectric substrate, and is formed so as to substantially surround the piezoelectric substrate. A groove for mounting the piezoelectric substrate is formed in the portion, a holding portion for supporting the piezoelectric substrate is formed at an end of the groove, and a gap is provided between opposed end faces of the extension portions of the two terminals. 2. The piezoelectric resonance component according to claim 1, wherein said leads of said two terminals extend in a direction perpendicular to a longitudinal direction of said extension. 3. The piezoelectric resonance component according to claim 2, wherein notches are formed at positions corresponding to each other at ends of the extension portions of the two terminals.