Push-pull electromagnetic transducer with increased Xmax

Details Push-pull electromagnetic transducer with increased Xmax Push-pull electromagnetic transducer with increased Xmax

2006-02-28

2006-02-28

Tran, Sinh (Department: 2646)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S400000, C381S401000, C381S421000

Reexamination Certificate

active

07006654

ABSTRACT:
An electromagnetic transducer such as an audio speaker, having an improved geometry in the positioning of its voice coils relative to its magnetic air gaps, facilitating a greater linear travel. The transducer has a push-pull geometry with at least two voice coils. At all positions throughout the linear travel region, less than 100% of the total voice coil windings are active, and less than 100% of the total available magnetic air gap height is active. As the voice coil assembly moves in one direction, the percentage of active windings or magnetic air gap is seamlessly handed off from the upper voice coil or magnetic air gap to the lower voice coil or magnetic air gap, and vice versa in the opposite direction. Some of the available voice coil windings and some of the available magnetic air gap height are left unused throughout the linear travel region, but, in exchange, the distance of the linear travel is dramatically increased.

REFERENCES:
patent: 5740265 (1998-04-01), Shirakawa
patent: 6542617 (2003-04-01), Fujihira et al.
patent: 6671385 (2003-12-01), Suzuki et al.
patent: 6751333 (2004-06-01), Azima et al.
Ballou, Glen M., “Handbook for Sound Engineers” 2002, Focal Press, 3rd Edition, p. 502 and figure 17-24.

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