Ultrasonic speaker and projector

Details Ultrasonic speaker and projector Ultrasonic speaker and projector

2011-08-30

2011-08-30

Kuntz, Curtis (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Having electrostatic element

C381S150000, C381S160000, C381S163000, C181S156000

Reexamination Certificate

active

08009846

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.

REFERENCES:
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patent: 5970158 (1999-10-01), Beltran
patent: 6304662 (2001-10-01), Norris et al.
patent: 6584206 (2003-06-01), Ohashi
patent: 6643377 (2003-11-01), Takahashi et al.
patent: 61-123389 (1986-06-01), None
patent: 2786531 (1998-05-01), None
patent: 2003-102084 (2003-04-01), None
Yonezawa Yoshimichi, Translation for Patent Abstract for JP 200310284, Apr. 2003.
Yonezawa Yoshimichi, Translation for Japanese Patent Publication JP 200310284, Apr. 2003.

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