Electrostatic ultrasonic transducer drive control method,...

Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker

Reexamination Certificate

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C381S191000, C381S077000

Reexamination Certificate

active

07907740

ABSTRACT:
A Push-Pull-type electrostatic ultrasonic transducer includes a first electrode having a through hole, a second electrode having a through hole making a pair with the through hole of the first electrode, and a vibration film held between a pair of electrodes composed of the first and the second electrodes and having a conductive layer to which a direct-current bias voltage is applied, and holds the pair of electrodes and the vibration film. Assuming that λ is the wavelength of the carrier wave having a frequency shifted as a predetermined amount of frequency from the resonance frequency, which is the mechanical resonance frequency of the vibration film, the thickness t of each of the pair of electrodes is set to (λ/4)·n or roughly (λ/4)·n (where, λ is the wavelength of the ultrasonic wave, n is a positive odd number), and an alternating-current signal, which is a modulated wave obtained by modulating the carrier wave in the ultrasonic frequency band with a signal wave in an audible frequency band, is applied between the pair of electrodes.

REFERENCES:
patent: 7668323 (2010-02-01), Miyazaki
patent: 7769193 (2010-08-01), Matsuzawa
patent: A-10-252444 (1998-09-01), None
patent: A-11-351196 (1999-12-01), None
patent: A 2000-50387 (2000-02-01), None
patent: A 2000-50392 (2000-02-01), None
patent: A-2004-312394 (2004-11-01), None
patent: A-2005-117103 (2005-04-01), None
patent: A-2005-223820 (2005-08-01), None

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