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Patent Searching and Data


Title:
PIEZOELECTRIC ACTUATOR
Document Type and Number:
Japanese Patent JPH11354851
Kind Code:
A
Abstract:

To obtain a piezoelectric actuator producing a large displacement and having a wide application.

A plurality of unimorph type diaphragm 1 formed by bonding a rectangular metal plate 3 to an electrode on one side of rectangular piezoelectric plate 2 are laminated in the thickness direction, and the end parts 3a, 3b in the length direction of the metal plates 3 of respective diaphragms 1 are connected alternately to obtain a bellows structure. When a DC field is applied between a lead wire 4 connected with the electrode on the other side of the piezoelectric plate 2 and the metal plate 3, the piezoelectric plate 2 extend or contracts in the length direction to generate a warp (displacement) in the diaphragm 1. Since the diaphragm 1 is cantilevered, displacement thereof can be increased. Since total displacement of the diaphragms 1 at respective stages can be obtained between the end part of the diaphragms 1 at the uppermost and lowermost stages, a large displacement can be obtained.


Inventors:
Yamamoto, Takashi
Application Number:
JP1998000157005
Publication Date:
December 24, 1999
Filing Date:
June 05, 1998
Export Citation:
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Assignee:
MURATA MFG CO LTD
International Classes:
H01L41/09; H02N2/00; H01H57/00; (IPC1-7): H01L41/09; H02N2/00
Attorney, Agent or Firm:
筒井 秀隆