Murata Manufacturing Co., Ltd.

Syuji Fujii

Kunio Sawai

Motohide Yonemura

A method for manufacturing a piezoelectric device includes the steps of providing a piezoelectric substrate having a piezoelectric driving unit and laminating outer coating substrates on major surfaces thereof via adhesive layers. Each of the adhesive layers includes a first layer of an adhesive having a Shore D hardness after curing of not more than approximately 60 and disposed so as not to be exposed in a region of lateral side surfaces of the layered body provided with the external electrodes, second and third layers of an adhesive having a Shore D hardness of at least approximately 60, and the third layer of having a viscosity before curing of at least approximately 3.0&times;10 mPas at a temperature of 25&deg; C. The third layer is disposed between the periphery of the first layer and the region of the lateral side surfaces of the layered body provided with the external electrodes.

Method for manufacturing a piezoelectric device

A piezoelectric device includes a piezoelectric substrate having a piezoelectric driving unit and provided with outer coating substrates laminated on major surfaces thereof via adhesive layers, and external electrodes provided on the outer surfaces of a layered body included in the piezoelectric device. In the piezoelectric device, each of the adhesive layers includes a first layer of an adhesive having a Shore D hardness after curing of not more than approximately 60, and disposed so as not to be exposed in a region of lateral side surfaces of the layered body provided with the external electrodes, a second layer of an adhesive having a Shore D hardness of at least approximately 60, and a third layer of an adhesive having a Shore D hardness of at least approximately 60 and having a viscosity before curing of at least approximately 3.0&times;10,mPas at a temperature of 25&deg; C. The third layer is disposed between the periphery of the first layer and the region of the lateral side surfaces of the layered body provided with the external electrodes.

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Takaoka, Japan

Syuji Fujii