Electrical audio signal processing systems and devices – Circuitry combined with specific type microphone or loudspeaker
Reexamination Certificate
2011-03-15
2011-03-15
Lee, Ping (Department: 2614)
Electrical audio signal processing systems and devices
Circuitry combined with specific type microphone or loudspeaker
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
Lee Ping
Oliff & Berridg,e PLC
Seiko Epson Corporation
LandOfFree
Electrostatic ultrasonic transducer drive control method,... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Electrostatic ultrasonic transducer drive control method,..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrostatic ultrasonic transducer drive control method,... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2745142