The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 2007
Filed:
Sep. 26, 2001
Wolfgang Bachmann, Grevenbroich, DE;
Hans-jürgen Regl, Regensburg, DE;
Gerhard Krump, Schwarzach, DE;
Andreas Ziganki, Mettmann, DE;
Wolfgang Bachmann, Grevenbroich, DE;
Hans-Jürgen Regl, Regensburg, DE;
Gerhard Krump, Schwarzach, DE;
Andreas Ziganki, Mettmann, DE;
Harman/Becker Automotive Systems GmbH, Straubing, DE;
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.