Ultrasonic transducer, method of manufacturing ultrasonic...

Details Ultrasonic transducer, method of manufacturing ultrasonic... Ultrasonic transducer, method of manufacturing ultrasonic...

2008-08-25

2011-11-01

Benson, Walter (Department: 2837)

Surgery

Diagnostic testing

Detecting nuclear, electromagnetic, or ultrasonic radiation

C310S311000

Reexamination Certificate

active

08047995

ABSTRACT:
A ultrasonic transducer of the invention comprises: a transducer cell including a first electrode and a second electrode disposed separated from the first electrode by an air gap portion; and an electret for applying a potential difference between the first electrode and the second electrode. The electret is disposed in a region where at least a part thereof does not overlap with the transducer cell when viewed from a transmitting direction of ultrasonic waves.

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English-language abstract only of International Publication No. WO 03/011749 A2 dated Feb. 13, 2003.
English-language abstract only of International Publication No. WO 03/035281 A2 dated May 1, 2003.

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