Title:
積層型圧電素子
Document Type and Number:
Japanese Patent JP4466321
Kind Code:
B2
Abstract:
Provided is a multilayer piezoelectric device high in reliability and easy in formation of a unit when incorporated into various devices. In a multilayer piezoelectric device, each second external electrode is integrally formed including a main body part electrically and physically connected to a first external electrode, and an extending part having an upper end projecting with respect to an upper face of laminate in a stack direction. This permits the extending part of the second external electrode to be used as a terminal, and, because the second external electrode is integrally formed, the second external electrode can be prevented from breaking. Therefore, it results in improving the reliability of piezoelectric device. Furthermore, between second external electrodes facing each other, a distance between extending parts is larger than a distance between main body parts, and thus it becomes easy to form a unit of the piezoelectric device when incorporated in various devices; e.g., a plate for application of a preload is placed on the upper face of the laminate.
Inventors:
Kazuo Mochizuki
Jun Ito
Yutaka Hatanaka
Jun Ito
Yutaka Hatanaka
Application Number:
JP2004314497A
Publication Date:
May 26, 2010
Filing Date:
October 28, 2004
Export Citation:
Assignee:
tdk Corporation
International Classes:
H01L41/083; H01L41/187; H01L41/22; H01L41/293
Domestic Patent References:
| JP2003060249A | ||||
| JP2002061551A | ||||
| JP3004576A | ||||
| JP2251185A |
Attorney, Agent or Firm:
Yoshiki Hasegawa
Yoshiki Kuroki
Takashi Mikami
Yasunori Ishizaka
Yoshiki Kuroki
Takashi Mikami
Yasunori Ishizaka