Invention Grant
- Patent Title: Ultrasonic speaker and projector
- Patent Title (中): 超声波扬声器和投影机
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Application No.: US12488789Application Date: 2009-06-22
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Publication No.: US08009846B2Publication Date: 2011-08-30
- Inventor: Hirokazu Sekino , Kinya Matsuzawa , Yoshiki Fukui , Shinichi Miyazaki
- Applicant: Hirokazu Sekino , Kinya Matsuzawa , Yoshiki Fukui , Shinichi Miyazaki
- Applicant Address: JP
- Assignee: Seiko Epson Corporation
- Current Assignee: Seiko Epson Corporation
- Current Assignee Address: JP
- Agency: Harness, Dickey & Pierce, P.L.C.
- Priority: JP2004-182464 20040621
- Main IPC: H04R25/00
- IPC: H04R25/00 ; H05K5/00

Abstract:
An ultrasonic speaker including: a vibration film having a conductive layer; a pair of fixed electrodes provided oppositely to respective surfaces of the vibration film; and an ultrasonic transducer that causes the vibration film to generate sound waves by applying a DC bias voltage to the conductive layer of the vibration film while applying an alternating signal between the pair of fixed electrodes, and outputs the sound waves generated by the vibration film from two sound wave output surfaces via through-holes provided in each of the pair of fixed electrodes. The two sound wave output surfaces of the ultrasonic transducer are disposed in a direction intersecting with a sound wave emitting direction at right angles.
Public/Granted literature
- US20090257606A1 ULTRASONIC SPEAKER AND PROJECTOR Public/Granted day:2009-10-15
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