Composite electronic component

Information

  • Patent Application
  • 20070194665
  • Publication Number
    20070194665
  • Date Filed
    February 09, 2007
    17 years ago
  • Date Published
    August 23, 2007
    17 years ago
Abstract
A composite electronic component provided is one with sufficient impact resistance. In this resonator 1, a capacitive element 3 has a projection 37 projecting outside a piezoelectric element 2, from a portion of the capacitive element 3 coinciding with a vibration region 2a. The projection 37 is provided on each of two sides of the capacitive element 3 in a direction substantially perpendicular to a longitudinal direction of the capacitive element 3. This causes the projections 37 of the capacitive element 3 to be buried in a mold resin 5, whereby the capacitive element 3 is sufficiently fixed to the mold resin 5 even if the mold resin 5 is provided with a vibration space 5a containing the vibration region 2a of the piezoelectric element 2. 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;a lead terminal group electrically connected through a connection part to the piezoelectric element and to the capacitive element; anda 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;wherein, when viewed from the predetermined direction, the capacitive element has a projection projecting outside the piezoelectric element, from a portion of the capacitive element coinciding with the vibration region.
  • 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 a first lead terminal electrically connected to the first piezoelectric element electrode and to the second capacitive element electrode, a 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, wherein the projection is provided on each of two sides of the capacitive element in a direction substantially perpendicular to the predetermined direction.
  • 4. The composite electronic component according to claim 1, wherein the projection is provided so that the capacitive element is arranged as shifted from the piezoelectric element in a direction substantially perpendicular to the predetermined direction.
Priority Claims (1)
Number Date Country Kind
P2006-047273 Feb 2006 JP national