Speaker

Details Speaker Speaker

2011-01-04

2011-01-04

Ensey, Brian (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S396000, C381S400000, C381S410000, C029S595000

Reexamination Certificate

active

07864976

ABSTRACT:
A speaker may include a voice coil bobbin and a center pole. The voice coil bobbin may include a nonmetallic pipe body as a base of the voice coil bobbin, a first nonmagnetic and electric conductor film which is formed on an inner peripheral face of the pipe body, and a second electric conductor film which is formed on an outer peripheral face of the pipe body such that the first electric conductor film is covered by the second electric conductor film through the pipe body. An electrostatic capacity that is formed between the voice coil bobbin and the center pole is detected and outputted as an electric signal.

REFERENCES:
patent: 4727586 (1988-02-01), Johnson
patent: 4924858 (1990-05-01), Katona
patent: 52-79644 (1977-07-01), None
patent: 53-12319 (1978-02-01), None
patent: 53-12320 (1978-02-01), None
patent: 53-12321 (1978-02-01), None
patent: 57014280 (1982-01-01), None
patent: 08205285 (1996-08-01), None

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