Title:
ELECTROMAGNETIC DRIVER FOR A PLANAR DIAPHRAGM LOUDSPEAKER
Document Type and Number:
WIPO Patent Application WO2002043435
Kind Code:
A3
Abstract:
The invention relates to an electromagnetic driver comprising a soft magnetic core in the form of an E with three legs and a back, an alternating field driver, magnetically coupled to the soft magnetic core, for generating an alternating magnetic field in the soft magnetic core, depending upon a sound signal, a constant field driver magnetically coupled to the soft magnetic core for generation of a constant magnetic field in the soft magnetic core, a soft magnetic element for coupling to the plate of the planar diaphragm loudspeaker, lying opposite the back and magnetically closing the legs across at least one small induction gap, whereby the constant field and the alternating field are asymmetrically superimposed such that a resulting force, or a resulting torque on the soft magnetic element is proportional to the sound signal.
Inventors:
BACHMANN WOLFGANG (DE)
REGL HANS-JUERGEN (DE)
KRUMP GERHARD (DE)
ZIGANKI ANDREAS (DE)
REGL HANS-JUERGEN (DE)
KRUMP GERHARD (DE)
ZIGANKI ANDREAS (DE)
Application Number:
PCT/EP2001/011184
Publication Date:
November 28, 2002
Filing Date:
September 26, 2001
Export Citation:
Assignee:
HARMAN BECKER AUTOMOTIVE SYS (DE)
BACHMANN WOLFGANG (DE)
REGL HANS-JUERGEN (DE)
KRUMP GERHARD (DE)
ZIGANKI ANDREAS (DE)
BACHMANN WOLFGANG (DE)
REGL HANS-JUERGEN (DE)
KRUMP GERHARD (DE)
ZIGANKI ANDREAS (DE)
International Classes:
H04R11/02; H04R7/04; (IPC1-7): H04R11/02
Domestic Patent References:
| WO1997009842A2 | 1997-03-13 |
Foreign References:
| DE19821860A1 | 1999-11-18 | |||
| US4392027A | 1983-07-05 |
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