Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
2007-06-19
2007-06-19
Swerdlow, Daniel (Department: 2615)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S433000
Reexamination Certificate
active
11022027
ABSTRACT:
An electromagnetic transducer such as an audio speaker which includes an asymmetric diaphragm to deliver smooth frequency response with reduced distortion by reduction of common modes in the diaphragm. Other benefits such as asymmetric directivity patterns can be realized. The asymmetric cone has a perimeter OD at which a surround may be coupled, and an ID at which a bobbin or spacer may be coupled. The center of the ID is not coincident with the center of the OD. The transducer further includes a stabilization mechanism for reducing rocking of the diaphragm assembly. The stabilization mechanism may include mass balancing of the diaphragm and/or adjustments to the location or symmetry of the suspension components.
REFERENCES:
patent: 3180945 (1965-04-01), Suzuki
patent: 3483946 (1969-12-01), Hiromi
patent: 4821330 (1989-04-01), Pfleiderer
patent: 6088466 (2000-07-01), Proni
patent: 6442282 (2002-08-01), Azima et al.
patent: 6763120 (2004-07-01), Sugiyama et al.
patent: 2001/0010728 (2001-08-01), Frasl
patent: 2002/0051558 (2002-05-01), Kuze et al.
Calderwood Richard C.
Stiles Enrique M.
Tummire Patrick M.
Calderwood Richard
STEP Technologies Inc.
Swerdlow Daniel
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