Drive unit for electro-acoustic converter with radially...

Details Drive unit for electro-acoustic converter with radially... Drive unit for electro-acoustic converter with radially...

2005-06-01

2009-06-23

Ensey, Brian (Department: 2614)

Electrical audio signal processing systems and devices

Electro-acoustic audio transducer

Plural or compound reproducers

C381S421000

Reexamination Certificate

active

07551746

ABSTRACT:
An electro-acoustic drive unit includes at least one permanent magnet assembly and at least an inner pole piece and an outer pole piece forming a pair of pole pieces, the permanent magnet assembly together with the pair of pole pieces forming a magnetic circuit with a pole gap for exciting a voice coil assembly. The pole gap is arranged to provide a magnetic field directed radially with respect to a center axis of the loudspeaker, and the permanent magnet assembly includes at least two permanent magnetic bars, with radially extending magnetization direction with respect to the center axis of the loudspeaker.

REFERENCES:
patent: 2122587 (1938-07-01), Ringel
patent: 3835427 (1974-09-01), Breitbach
patent: 5214710 (1993-05-01), Ziegenberg et al.
patent: 5598625 (1997-02-01), Bluen et al.
patent: 5786741 (1998-07-01), Leibzon
patent: 6020805 (2000-02-01), B.o slashed.rja
patent: 6636612 (2003-10-01), North et al.
patent: 4215519 (1993-09-01), None
patent: 319942 (1929-10-01), None
patent: 06351098 (1994-12-01), None
patent: 10174192 (1998-06-01), None
patent: 11196491 (1999-07-01), None
European Official Action in corresponding EP01272441.5, May 29, 2008.

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