Speaker and speaker apparatus

Details Speaker and speaker apparatus Speaker and speaker apparatus

2008-07-25

2011-12-06

Booth, Richard A. (Department: 2812)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S412000

Reexamination Certificate

active

08073187

ABSTRACT:
A speaker capable of properly adjusting a spring characteristic with which a voice coil is driven and capable of being driven in large amplitude. When a position control coil wound around a bobbin is at a reference position, both ends of the coil cross a magnetic gap formed between external and internal yokes by a predetermined length and Lorentz forces acting on the front and rear ends are balanced. When the voice coil moves in either forward or rearward direction, lengths of the magnetic gap crossed by the front and rear ends of the control coil are different therebetween, and the vector sum of Lorentz forces acting on the position control coil is opposite in direction from the movement of the voice coil, whereby the voice coil is stably held at the reference position.

REFERENCES:
patent: 5408533 (1995-04-01), Reiffin
patent: 5828767 (1998-10-01), Button
patent: 7142685 (2006-11-01), Barnes
patent: 2029669 (1980-03-01), None
patent: 11-164394 (1999-06-01), None
patent: 2001-186589 (2001-07-01), None
Lemarquand, Guy; “New Structure of Loudspeaker”; Audio Engineering Society Convention Paper 6846, presented at the 120th Convention; May 20-23, 2006; pp. 1-4; Paris France. Cited in specification.

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