Speakers

Details Speakers Speakers

2008-07-01

2008-07-01

Ni, Suhan (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S404000, C381S407000

Reexamination Certificate

active

07394913

ABSTRACT:
A voice coil bobbin coupled to a damper is allowed to vibrate in its axis direction within a magnetic circuit including a magnet and a plate supported by a yoke. A range extending between a neutral position of an end of the voice coil bobbin and a portion of the yoke opposing the end of the voice coil bobbin is longer than a range extending between the plate and a neutral position of a portion where the voice coil bobbin is coupled to the damper. A damper ring is fitted around the voice coil bobbin in a position closer to the plate within the portion where the voice coil bobbin is coupled to the damper. A rear face of the damper ring opposing the plate is shaped in face-geometry parallel to a face of the plate opposing the damper ring.

REFERENCES:
patent: 4118605 (1978-10-01), Kobayashi
patent: 6118884 (2000-09-01), Proni
patent: 6385327 (2002-05-01), D'Hoogh
patent: 2003-116197 (2003-04-01), None

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