Electromagnetic transducer having multiple magnetic air gaps...

Details Electromagnetic transducer having multiple magnetic air gaps... Electromagnetic transducer having multiple magnetic air gaps...

2005-07-12

2005-07-12

Kuntz, Curtis (Department: 2643)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Electromagnetic

C381S414000, C381S421000

Reexamination Certificate

active

06917690

ABSTRACT:
An electromagnetic transducer such as an audio speaker exhibiting highly linear performance over a greatly extended excursion. The motor structure includes a stack of two or more magnet and plate pairs, with the magnets polarized in the same orientation such that the magnetic flux flows in the same direction over all of the magnetic air gaps. The voice coil is handed off from gap to gap with a configuration providing a substantially constant BL over an end-to-end distance at least as large as the thickness of one plate plus twice the thickness of one magnet.

REFERENCES:
patent: 4783824 (1988-11-01), Kobayashi
patent: 5740265 (1998-04-01), Shirakawa
patent: 2003/0133587 (2003-07-01), Hyre et al.
patent: 2003/0152246 (2003-08-01), Tanabe

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