ELECTROSTATIC ULTRASONIC TRANSDUCER, ULTRASONIC SPEAKER, SOUND SIGNAL REPRODUCING METHOD, ULTRA DIRECTIONAL ACOUSTIC SYSTEM AND DISPLAY DEVICE
First Claim
1. An electrostatic ultrasonic transducer comprising:
- a first electrode including a through hole and plural electrode patterns;
a second electrode including a through hole forming a pair with the through hole of the first electrode and plural electrode patterns forming a pair with the electrode patterns;
an oscillation film including an electrode layer and sandwiched between a pair of electrodes formed from the first electrode and the second electrode; and
a controlling unit for applying voltage between the electrode patterns of the pair of electrodes and the electrode layer of the oscillation film to drive the oscillation film under plural driving conditions.
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Accused Products
Abstract
An electrostatic ultrasonic transducer includes: a first electrode provided with a through hole; a second electrode provided with a through hole forming a pair with the through hole of the first electrode; an oscillation film sandwiched between the pair of electrodes and having an electrode layer wherein a direct current bias voltage is applied to the electrode layer, the oscillation film being driven by applying an alternating current signal between the pair of electrodes and the electrode layer; a holding member for holding the pair of electrodes and the oscillation film; electrode patterns respectively formed by lamination on the first and second electrodes corresponding to plural driving functions; and a controlling unit for carrying out control so that voltage corresponding to a driving condition defining the driving function is applied between the electrode pattern formed by lamination and the electrode layer of the oscillation film.
45 Citations
14 Claims
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1. An electrostatic ultrasonic transducer comprising:
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a first electrode including a through hole and plural electrode patterns;
a second electrode including a through hole forming a pair with the through hole of the first electrode and plural electrode patterns forming a pair with the electrode patterns;
an oscillation film including an electrode layer and sandwiched between a pair of electrodes formed from the first electrode and the second electrode; and
a controlling unit for applying voltage between the electrode patterns of the pair of electrodes and the electrode layer of the oscillation film to drive the oscillation film under plural driving conditions. - View Dependent Claims (2, 3, 7, 9, 11, 13)
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4. An electrostatic ultrasonic transducer comprising:
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an electrode including plural electrode patterns and including convex and concave parts on the surface thereof;
an oscillation film including an electrode layer and held on the surface of the electrode; and
a controlling unit for applying voltage between the electrode pattern of the electrode and the electrode layer of the oscillation film to drive the oscillation film under plural driving conditions. - View Dependent Claims (5, 6, 8, 10, 12, 14)
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Specification