Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1984-11-29
1986-08-05
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310358, 310359, 310366, H01L 4108
Patent
active
046045430
ABSTRACT:
A multi-element ultrasonic transducer in which elements are arrayed and in which a plate-shaped piezoelectric material has its one face formed with a uniform electrode and its other face formed alternately with electrodes corresponding to the respective elements and electrodes for separating the elements. These electrodes for the element separation are connected the uniform electrode opposed thereto and is fed with a ground potential. On the other hand, the electrodes corresponding to the respective elements are fed individually with transmitting and receiving signals independently of the elements so that the electronic scanning or focusing operations can be achieved.
REFERENCES:
patent: 2262966 (1941-11-01), Rohde
patent: 2306909 (1942-12-01), Sykes
patent: 3656180 (1972-04-01), Braun
patent: 3739304 (1973-06-01), Braun
patent: 4406967 (1983-09-01), Obara et al.
patent: 4424465 (1984-01-01), Ohigashi et al.
patent: 4473769 (1984-09-01), Nguyen
Katakura Kageyoshi
Shinomura Ryuichi
Takeuchi Hiroshi
Umemura Shin'ichiro
Budd Mark O.
Hitachi , Ltd.
Hitachi Medical Corporation
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