Global Patent Index - EP 0624049 A3

EP 0624049 A3 19950308 - A loudspeaker apparatus.

Title (en)

A loudspeaker apparatus.

Title (de)

Lautsprecherapparat.

Title (fr)

Appareil haut-parleur.

Publication

EP 0624049 A3 19950308 (EN)

Application

EP 94106578 A 19940427

Priority

  • JP 10230893 A 19930428
  • JP 13449393 A 19930604

Abstract (en)

[origin: EP0624049A2] A yoke (96), which has an inner peripheral wall (96b) formed concentrically with an outer peripheral wall (96a), is used in a magnetic circuit of a loudspeaker. A rare earth element magnet ring (98) is disposed between the outer and inner peripheral walls of the yoke (96) so as to form a magnetic gap (99) there. Thus, a compact, light and powerful magnetic circuit is obtained. The magnetic circuit is disposed in front of a diaphragm (103), which reduces the thickness of the loudspeaker. By making the projected area of the magnetic circuit on the diaphragm a half or less of the effective area of the diaphragm, deterioration of the performance properties and the quality of reproduced sounds can be avoided. Moreover, a heat dissipator (110) is provided on the yoke (96) so as to prevent any extraordinary or damaging increase in temperature of a voice coil even when large signals are continuously input to the loudspeaker. As a result, performance properties of the loudspeaker can be stabilized and reliability thereof can be enhanced.

IPC 1-7

H04R 9/06; H04R 9/02

IPC 8 full level

H04R 9/02 (2006.01); H04R 9/06 (2006.01)

CPC (source: EP)

H04R 9/02 (2013.01); H04R 9/022 (2013.01); H04R 9/06 (2013.01)

Citation (search report)

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 0624049 A2 19941109; EP 0624049 A3 19950308; EP 0624049 B1 20020612; DE 69430776 D1 20020718; DE 69430776 T2 20030327

DOCDB simple family (application)

EP 94106578 A 19940427; DE 69430776 T 19940427