Patent · US Expired

Electromagnetic driver for a planar diaphragm loudspeaker

US7158651B2 · kind B2 · utility

23Cited by

8References

20Claims

0Family size

Assignee

HARMAN BECKER AUTOMOTIVE SYSTEMS GMBH · DE

Inventors

Wolfgang Bachmann · Grevenbroich, DE
Hans-Jürgen Regl · Goldkronach, DE
Gerhard Krump · Rötz, DE
Andreas Ziganki · Mettmann, DE

Key dates

Filing date	Sep 26, 2001
Grant date	Jan 2, 2007
Priority date	—
Expiry date	Jul 8, 2023

Classification

Technology area (CPC H)Electricity
CPC primaryH04R7/045
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.