Piezoelectric element and ultrasonic actuator

Details Piezoelectric element and ultrasonic actuator Piezoelectric element and ultrasonic actuator

2007-01-19

2009-06-09

SanMartin, Jaydi (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S366000

Reexamination Certificate

active

07545085

ABSTRACT:
Internal electrode layers (5) include a common electrode layer (3) and feed electrode layers (6) alternately placed in a stacking direction with piezoelectric layers (1) interposed between the common electrode layer (3) and the feed electrode layers (6). The common electrode layer (3) has a common electrode (3a). The feed electrode layers (6) include a first feed electrode layer (6a) and a second feed electrode layer (6b). The first feed electrode layer (6) has a pair of electrically continuous first electrodes (2, 2) disposed on two areas (A2, A4) opposed along a first-diagonal-line direction (D1) of the principal surface of the associated piezoelectric layer (1) among four areas (A1through A4) defined by dividing the principal surface of the associated piezoelectric layer (1) into two parts in the longitudinal and transverse directions (L) and (S). The second feed electrode layer (6) has a pair of electrically continuous second electrodes (4, 4) disposed on two areas (A1, A3) opposed along a second-diagonal-line direction (D2) of the principal surface of the associated piezoelectric layer (1) among the four areas (A1through A4). The common electrode (3a), the first electrodes (2, 2), and the second electrodes (4, 4) are connected to associated external electrodes (7g, 7b, 7a).

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Japanese Office Action, with English translation, issued in Japanese Patent Application No. JP 2007-525099, mailed Oct. 2, 2007.

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