Audio speaker with graduated voice coil windings

Details Audio speaker with graduated voice coil windings Audio speaker with graduated voice coil windings

2004-08-17

2009-02-17

Ni, Suhan (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S408000, C381S410000

Reexamination Certificate

active

07492918

ABSTRACT:
An audio speaker driver having a voice coil with graduated windings such that different sections of the voice coil have different electrical resistances and/or lengths per unit of height of the voice coil. A center portion of the voice coil gives a greater BL, while outer portions give lower overall electrical resistance, such that the audio speaker driver is highly efficient and linear during low excursion operation, with a smoother transition from the linear region to the grossly non-linear region. The wire of the graduated voice coil can have varying cross-sectional area over its length, can be wound on varying on-center spacing, can be wound in different numbers of layers in the various sections, and/or it can fork into interlaced, parallel windings.

REFERENCES:
patent: 3711659 (1973-01-01), Bremseth
patent: 4160133 (1979-07-01), Wiik
patent: 6158109 (2000-12-01), Tanabe et al.

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