JPH0633704Y2 - Capacitor composite piezoelectric component - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a composite piezoelectric component including a piezoelectric resonator and a capacitor element in an exterior resin.

(B) Conventional Technology Conventionally, as a piezoelectric component, for example, there is an energy trap type piezoelectric resonator having a thickness shear vibration mode as shown in FIG. In FIG. 3, 10 represents a piezoelectric resonator,
Electrodes 2 and 3 that partially face each other are formed on both main surfaces of a strip-shaped piezoelectric substrate 1, and the vicinity of both ends of this piezoelectric resonator is formed in a bag shape on the upper ends of two leads 4 and 5. Holding part 4a,
It is held by 5a and is electrically connected by solder or the like. FIG. 4 shows a side sectional view of the bag-shaped holding portion 5a in FIG. 9 in the figure
Represents a resin that is coated on the outer periphery of the piezoelectric resonator 10.
As can be seen from FIGS. 3 and 4, the two leads 4,
Each of 5 is bent near the bag-shaped holding portion so as to be pulled out from the approximate center of the exterior resin 9 in the thickness direction.

5 and 6 are a perspective view and a side sectional view of the capacitor composite piezoelectric component. In this example, a capacitor element 20 including two capacitors is added to the piezoelectric resonator shown in FIG. Strip-shaped dielectric substrate 6
One main surface of one of the electrodes has an electrode 7 formed by commonly connecting one of the two sets of capacitor electrodes, and the other main surface has two electrodes formed at a position facing the electrode 7 to form a bag shape. Are joined and fixed to the side portions of the holding portions 4a and 5a by soldering or the like. Reference numeral 8 is a lead electrically connected to the electrode 7, and its upper end portion 8a is joined by solder or the like. In this way, a capacitor composite piezoelectric component in which one piezoelectric resonator and two capacitors are connected is constructed as shown in FIG.

(C) Problems to be Solved by the Invention Although the capacitor composite piezoelectric component configured as described above is also covered with the exterior resin, it is offset from the central portion in the thickness direction of the exterior resin 9 as shown in FIG. It will be pulled out from the position. Therefore, it is inconvenient in handling as compared with a two-terminal type electronic component in which only the piezoelectric resonator is covered with resin. In particular, when mounting this electronic component on a circuit board by an automatic inserter, a large number of electronic components are used in a pre-taped state. At that time, the automatic inserter clamps the electronic component based on the position of the tape. Since it is designed as described above, the electronic component cannot be reliably clamped in the case of the capacitor composite piezoelectric component described above. Therefore, there is a problem that the types of automatic insertion machines that can be used are limited.

It is an object of the present invention to provide a capacitor composite piezoelectric component which solves the conventional problems and can be adapted to various automatic insertion machines.

(D) Means for Solving the Problems A capacitor composite piezoelectric component of the present invention comprises a piezoelectric resonator in which electrodes are drawn out at both ends of a strip-shaped piezoelectric substrate, and a central portion of one main surface of the strip-shaped dielectric substrate. What is claimed is: 1. A capacitor composite piezoelectric component comprising an outer resin and a capacitor element having electrodes formed on both ends of the other main surface.
Both ends of the piezoelectric resonator are held by holding portions formed at one end of each of the leads, and the electrodes formed at both ends of the capacitor element are connected outside the holding portions of the first and second leads. , Connecting the electrode formed at the central portion of the capacitor element to one end of the third lead, and forming a bent portion at a position in the exterior resin of each of the first, second and third leads. The first, second and third leads are drawn out of the exterior resin from an intermediate position between the piezoelectric resonator and the capacitor element.

(E) Action In the capacitor composite piezoelectric component of the present invention, both ends of the piezoelectric resonator are held by the holding portions formed at one end of each of the first and second leads, and the first and second leads are held. The electrodes formed on both ends of the capacitor element are connected to the outside of the holding portion of the lead, one end of a third lead is connected to the electrode formed on the central portion of the capacitor element, and A bent portion is formed at a position in the exterior resin of each of the first, second and third leads, and the first, second and third leads are provided in the exterior from an intermediate position between the piezoelectric resonator and the capacitor element. It is pulled out of the resin. As a result, a capacitor composite piezoelectric component can be obtained in which all leads are pulled out from a position located at the center of the exterior resin in the thickness direction.

(F) Embodiment FIG. 1 is a perspective view showing a structure before coating an exterior resin in a capacitor composite piezoelectric component according to an embodiment of the present invention.
Drawings (A) and (B) show the front view and side sectional view, respectively. In FIG. 1, reference numeral 10 denotes a piezoelectric resonator in which electrodes 2 and 3 that partially face each other are formed on both main surfaces of a strip-shaped piezoelectric substrate 1, and 20 denotes one main surface of a strip-shaped dielectric substrate 6. One electrode 7 is formed in the central portion of each of the electrodes, electrodes 7a and 7b extending from both ends of the dielectric substrate 6 are formed from the center electrode, and the other two electrodes (Fig. (Not shown) represents the formed capacitor element. By configuring the capacitor element 20 in this way, two capacitors are configured between the other two electrodes facing the electrodes 7a and 7b and the electrode 7, and the electrode 7 is a terminal common to the two capacitor elements. It also acts as an electrode.
The vicinity of both ends of the piezoelectric resonator 10 is held by bag-shaped holding portions 4a and 5a formed on the upper ends of the leads 4 and 5, and is joined by solder or the like. Therefore, the electrode 2 is electrically connected to the lead 4 and the electrode 3 is electrically connected to the lead 5. On the other hand, one electrode 7 of the capacitor element 20 is joined to the upper end portion 8a of the lead 8 by soldering or the like. The other electrode (not shown) is joined to the side portions of the bag-shaped holding portions 4a and 5a by soldering or the like. By thus joining the three leads 4, 8, 5 to the piezoelectric element 10 and the capacitor element 20, the capacitor composite piezoelectric component shown by the equivalent circuit shown in FIG. 7 is constructed.

FIG. 2B shows a cross-sectional view taken along the line AA shown in FIG. As is clear from this figure, the two leads 4 and 5 are bent outward near the lower ends of the bag-shaped holding portions 4a and 5a as shown by B1 to form the bottoms of the bag-shaped holding portions 4a and 5a. is doing. Further, the leads 4 and 5 are again bent inward as shown by B2, and are bent so as to be pulled out downward from a position located at the center of the exterior resin 9 in the thickness direction. On the other hand, the lead 8 is bent so as to be drawn out in the same plane as the two leads 4 and 5 as shown by C. The exterior resin 9 covers the outer peripheries of the two electronic components including the bent portions of the leads 4, 5, and 8. In this way, a capacitor composite piezoelectric component is constructed in which three leads are drawn from the center of the thickness of the exterior resin.

(G) Effect of the Invention As described above, according to this invention, the piezoelectric resonator having various electrodes formed on the strip-shaped piezoelectric substrate and the capacitor element having various electrodes formed on the strip-shaped dielectric substrate are both placed in the exterior resin. It is possible to obtain a capacitor composite piezoelectric component in which the first, second, and third leads are provided while being pulled out to the outside from the center of the exterior resin in the thickness direction. Therefore, the capacitor composite piezoelectric component can be handled like an ordinary electronic component with leads, and can be easily mounted on a circuit board by taping, for example, and by a general conventional automatic inserter.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of a capacitor composite piezoelectric component according to an embodiment of the present invention, and FIGS. 2 (A) and 2 (B) are a front view and a side sectional view of the capacitor composite piezoelectric component, and FIG. FIG. 4 is a perspective view and a side sectional view showing the structure of a conventional two-terminal type capacitor composite piezoelectric component, and FIGS. 5 and 6 are perspective views and side sectional views showing the structure of a conventional three-terminal type capacitor composite piezoelectric component. FIGS. 7A and 7B show an equivalent circuit of the capacitor composite piezoelectric component according to the related art and the embodiment of the present invention. 4,5 ... Lead 4a, 5a ... Holding part 8 ... Lead 9 ... External resin 10 ... Piezoelectric resonator 20 ... Capacitor element

Claims (1)

[Scope of utility model registration request] 1. A piezoelectric resonator in which electrodes are drawn out at both ends of a strip-shaped piezoelectric substrate, and a capacitor element in which electrodes are formed at the center of one main surface of the strip-shaped dielectric substrate and at both ends of the other main surface, respectively. Is a capacitor composite piezoelectric component having both in an exterior resin, wherein both ends of the piezoelectric resonator are held by holding portions formed at one end of each of the first and second leads. The electrodes formed at both ends of the capacitor element are connected to the outside of the holding portion of the lead, and the electrodes formed in the central portion of the capacitor element are connected to one end of the third lead, and Second and third
A bent portion is formed at a position of each lead in the exterior resin, and the first, second, and third leads are drawn out of the exterior resin from an intermediate position between the piezoelectric resonator and the capacitor element. Capacitor composite piezoelectric component.