Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electrostrictive – magnetostrictive – or piezoelectric
Reexamination Certificate
2005-09-21
2010-02-23
Kuntz, Curtis (Department: 2614)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electrostrictive, magnetostrictive, or piezoelectric
C381S354000
Reexamination Certificate
active
07668323
ABSTRACT:
A push-pull type electrostatic ultrasonic transducer includes a vibrating film having a conductive layer and a pair of fixed electrodes provided at respective surfaces of the vibrating film. The front-side fixed electrode and the rear-side fixed electrode sandwich the vibrating film. A plurality of through holes are provided in the front-side fixed electrodes and through holes having the same shape are provided in the rear-side fixed electrode in positions opposed to the respective through holes provided in the front-side fixed electrode. A sound absorbing material is provided facing the rear-side fixed electrode.
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Bedout, J.M; “Adaptive-Passive Noise Control With Self-Tuning Helmholtz Resonators”; Apr. 15, 2002; Journal of Sound and Vibration; vol. 202, Issue 1; pp. 109-123.
Harness & Dickey & Pierce P.L.C.
Kuntz Curtis
Robinson Ryan C
Seiko Epson Corporation
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