Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Electromagnetic
Reexamination Certificate
2006-11-28
2006-11-28
Ni, Suhan (Department: 2615)
Electrical audio signal processing systems and devices
Electro-acoustic audio transducer
Electromagnetic
C381S412000, C381S414000
Reexamination Certificate
active
07142685
ABSTRACT:
A loudspeaker motor structure uses variable geometry to change the effective magnetic field acting on the voice coil of the motor structure. A magnet generates the magnetic field, which couples into a front plate, a back plate, and a pole piece. In one loudspeaker, the front plate and the pole piece have notches and slots. Rotating the pole piece relative to the front plate varies the width of the gap between the pole piece and the front plate, and the effective magnetic field in the gap. In another loudspeaker, the pole piece moves up and down in relation to the back plate. This movement varies the magnetic coupling between the pole piece and the back plate and, consequently, the effective magnetic field in the gap between the pole piece and the front plate. Variations in the effective magnetic field in the gap result in variations of the loudspeaker parameters.
REFERENCES:
patent: 5173943 (1992-12-01), Dzurko
patent: 5748753 (1998-05-01), Carver
patent: 5940522 (1999-08-01), Cahill et al.
patent: 6219431 (2001-04-01), Proni
Lampton, Theory of Bounded-Ripple Loudspkr Sys, IEEE Trans Audio & Electroacous AU20 #5 392-96 Dec. 1972.
Burrow & Grant, Efficiency of Low Power Aud Amp & Loudspkrs, IEEE Tran Consumer Elec., V47 #3 Aug. 2001.
Infinity Kappa Series 10VQ/10d VQ 2 12 VQ/12d VQ subwoofer instructions.
Bean, Esq. K C
DEI Headquarters, Inc.
Friedl, Esq. Ryan J.
Ni Suhan
Weiser, Esq. Anatoly S.
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