Speaker and method of manufacturing the speaker

Details Speaker and method of manufacturing the speaker Speaker and method of manufacturing the speaker

2006-04-04

2006-04-04

Ni, Suhan (Department: 2646)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S396000, C381S398000

Reexamination Certificate

active

07024015

ABSTRACT:
The speaker disclosed in this invention comprises: (a) a central cap fixed on voice coil bobbin; (b) a shaft fixed in the center of the central cap; and (c) a bearing filled with lubricating fluid and fixed in a through-hole disposed in the center of a magnetic circuit. The speaker has excellent characteristics without sliding noise or harmful rolling phenomena but with reduced harmonic distortion due to the introduction of a magnetic fluid or a lubricant used as a lubricating fluid.

REFERENCES:
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patent: 4757547 (1988-07-01), Danley
patent: 4933975 (1990-06-01), Button
patent: 5475765 (1995-12-01), Lyth
patent: 6639993 (2003-10-01), Kemmerer et al.
patent: 50-14437 (1975-02-01), None
patent: 63-196199 (1988-12-01), None
patent: 2940236 (1999-06-01), None
patent: 2001-36989 (2001-02-01), None
patent: 02/065811 (2002-08-01), None

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