Title:
COMPOSITE PIEZOELECTRIC ELEMENT
Document Type and Number:
Japanese Patent JP3651687
Kind Code:
B2
Abstract:
PURPOSE: To realize the piezoelectric element utilizing the thickness longitudinal vibration second harmonic wave mode while eliminating an internal electrode to be made of an expensive material.
CONSTITUTION: A composite piezoelectric element 11 is provided with a laminate structure 15 in which a piezoelectric body 13 polarized in the thickness direction 12 and a paraelectric body 14 having no piezoelectricity are laminated in the thickness direction, and a couple of external electrodes 16, 17 opposite to each other are formed so as to have the laminate structure 15 between them in the thickness direction. The ratio of the thickness of the piezoelectric body/ paraelectric body is preferably 1.5-0.5 and the ratio of the sound velocity of the piezoelectric body/paraelectric body is preferably 0.9 or below.
Inventors:
Seiji Kaminami
Yo Ando
Hiroshi Takagi
Yo Ando
Hiroshi Takagi
Application Number:
JP15362391A
Publication Date:
May 25, 2005
Filing Date:
June 26, 1991
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H01L41/083; B60K17/344; H01L41/09; H03H9/17; (IPC1-7): H03H9/17; H01L41/083
Domestic Patent References:
| JP5511377A | ||||
| JP1117409A | ||||
| JP6412609A | ||||
| JP56131979A | ||||
| JP62216282A | ||||
| JP5390844A | ||||
| JP5936440B2 |