Composite electronic component

Abstract

A composite electronic component provided is one with sufficient impact resistance. In this resonator 1, a piezoelectric element 2 is supported by receivers 73, 83 in platelike holding portions 72, 82, and edge parts 74a, 84a in the holding portions 72, 82 are in contact with a capacitive element 3. This results in keeping the distance constant between the piezoelectric element 2 and the capacitive element 3. Furthermore, even if an impact is exerted on the resonator 1, the platelike holding portions 72, 82 will absorb the impact. Therefore, an improvement is made in impact resistance of the resonator 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a resonator which is an embodiment of the composite electronic component according to the present invention.

FIG. 2 is a perspective view of a piezoelectric element in the resonator shown in FIG. 1.

FIG. 3 is a perspective view of a capacitive element in the resonator shown in FIG. 1.

FIG. 4 is a sectional view along line IV-IV shown in FIG. 1.

FIG. 5 is a front view of the resonator shown in FIG. 1.

FIG. 6 is a side view of the resonator shown in FIG. 1.

FIG. 7 is a drawing as side views of the piezoelectric element and the capacitive element during application of wax, wherein (a) shows a state during application of wax to a conventional resonator and (b) a state during application of wax to the resonator shown in FIG. 1.

FIG. 8 is a characteristic diagram showing fluctuations of resonant resistance of the resonator shown in FIG. 1.

FIG. 9 is a drawing as side views of the piezoelectric element and the capacitive element during application of wax to a resonator according to a modification example, wherein (a) shows a state in which the piezoelectric element and the capacitive element are provided with their respective projections and (b) a state in which the capacitive element is provided with a projection only on one side.

Claims

1. A composite electronic component comprising: a piezoelectric element having a vibration region;a capacitive element juxtaposed to one side of the piezoelectric element in a predetermined direction; anda lead terminal group electrically connected through a connection part to the piezoelectric element and to the capacitive element;wherein the lead terminal group has a first lead terminal provided with a first holding portion of a plate shape for holding one end of the piezoelectric element in a direction substantially perpendicular to the predetermined direction, and a second lead terminal provided with a second holding portion of a plate shape for holding an other end of the piezoelectric element in the direction substantially perpendicular to the predetermined direction,wherein the first holding portion comprises a first receiver in contact with the one end of the piezoelectric element, and a first edge part becoming more distant from the piezoelectric element with distance from the first receiver toward the other end of the piezoelectric element, and being in contact with the capacitive element, andwherein the second holding portion comprises a second receiver in contact with the other end of the piezoelectric element, and a second edge part becoming more distant from the piezoelectric element with distance from the second receiver toward the one end of the piezoelectric element, and being in contact with the capacitive element.

2. The composite electronic component according to claim 1, wherein the piezoelectric element has a piezoelectric portion including the vibration region, a first piezoelectric element electrode formed on one surface of the piezoelectric portion and facing the vibration region along the predetermined direction, and a second piezoelectric element electrode formed on another surface of the piezoelectric portion and facing the vibration region along the predetermined direction,wherein the capacitive element has a dielectric portion, a first capacitive element electrode formed on one surface of the dielectric portion, a second capacitive element electrode formed on an other surface of the dielectric portion, and a third capacitive element electrode formed on the other surface of the dielectric portion, andwherein the lead terminal group has the first lead terminal electrically connected to the first piezoelectric element electrode and to the second capacitive element electrode, the second lead terminal electrically connected to the second piezoelectric element electrode and to the third capacitive element electrode, and a third lead terminal electrically connected to the first capacitive element electrode.

3. The composite electronic component according to claim 1, further comprising a coating member having a vibration space containing the vibration region, and arranged to coat the piezoelectric element, the capacitive element, and the connection part of the lead terminal group.

4. The composite electronic component according to claim 1, wherein the first receiver is curved so as to pinch the one end of the piezoelectric element, and wherein the second receiver is curved so as to pinch the other end of the piezoelectric element.