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US 4,360,754 AGranted
Mode suppressed piezoelectric device
AssigneeMurata Manufacturing Co., Ltd.
InventorsIsao Toyoshima, Eizo Ohtsuka
Life of this patent
Estimating the term…
Abstract
A piezoelectric device having a casing and a piezoelectric unit supported in the casing by the use of a direction-oriented electroconductive pliable sheet. The piezoelectric unit has a plate-like shape with electrodes laminated on its opposite surfaces. The electrode provided on one surface of the piezoelectric unit extends and is disposed on the opposite surface for gathering all the electrodes on the opposite surface.
Claims12
A three terminal piezoelectric unit, comprising:
- (a) a planar piezoelectric body having oppositely facing first and second flat surfaces which are rectangular in shape;
- (b) a first electrode located on a central portion of said first surface of said piezoelectric body;
- (c) a second electrode located on the entire said second surface of said piezoelectric body;
- (d) a rim electrode surrounding said first electrode and located adjacent all edges of said first surface except one central portion of one side edge of said first surface;
- (e) an extended electrode located on said one central portion of one side edge of said first surface in a spaced relation to both said first electrode and said rim electrode;
- (f) a runner electrode electrically connecting said second electrode with said extended electrode such that when said piezoelectric unit is excited and vibrated primarily in the breathing mode, spurious harmonic vibrations are dampened.
3 more elements
A piezoelectric device, comprising:
- (a) a casing;
- (b) a first piezoelectric unit incorporated in said casing, said first piezoelectric unit comprising:
- (i) a planar piezoelectric body having oppositely facing first and second flat surfaces which are rectangular in shape;
- (ii) a first electrode located on a central portion of said first surface of said piezoelectric body;
- (iii) a second electrode located on the entire said second surface of said piezoelectric body;
- (iv) a rim electrode surrounding said first electrode and located adjacent all edges of said first surface except one central portion of one side edge of said first surface;
- (v) an extended electrode laminated on said one peripheral portion of said first surface in a spaced relationship to said first electrode;
- and
- (vi) a runnr electrode electrically connecting said second electrode with said extended electrode whereby when said piezoelectric unit is excited and vibrated primarily in the breathing mode, spurious harmonic vibrations are dampened;
- (c) a base plate made of electrically non-conductive material and incorporated in said casing for dividing the casing into first and second compartments, said base plate having a first group of printed electrodes provided on a first surface thereof facing said first compartment;
- (d) a first terminal means connected to respective printed electrodes on said first surface of said base plate, each terminal of said first terminal means having a terminal leg extending outwardly from the casing for the external connection thereof;
- (e) a first direction-oriented electroconductive pliable sheet sandwiched between said first surface of said first piezoelectric unit and said first surface of said base plate in such a manner that the laminated electrodes of said first electrode means and said extended electrodes on said piezoelectric body are in face-to-face relation through the first direction-oriented electroconductive pliable sheet to corresponding printed electrodes on said first surface of said base plate;
- and
- (f) a first attaching projection rigidly held in said first compartment of said casing, said first attaching projection being held in contact with a central portion of said second surface of said first piezoelectric unit for vibrantly supporting said first piezoelectric unit.
11 more elements
Dependencies are inferred from the claim text.