EP 0624049 A3 19950308 - A loudspeaker apparatus.
Title (en)
A loudspeaker apparatus.
Title (de)
Lautsprecherapparat.
Title (fr)
Appareil haut-parleur.
Publication
Application
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
IPC 8 full level
CPC (source: EP)
H04R 9/02 (2013.01); H04R 9/022 (2013.01); H04R 9/06 (2013.01)
Citation (search report)
- [YA] DE 4126121 A1 19930211 - MAC AUDIO ELECTRONIC GMBH [DE]
- [YA] WO 9303586 A1 19930218 - AURA SYSTEMS INC [US]
- [YA] US 4327257 A 19820427 - SCHWARTZ LESLIE H
- [A] DE 3638693 A1 19870521 - BOSE CORP [US]
- [A] DE 3007991 A1 19810917 - EHMANN ELEKTROTECH [DE]
- [A] US 4933975 A 19900612 - BUTTON DOUGLAS J [US]
- [A] US 3763334 A 19731002 - PARKER R
- [A] US 4379951 A 19830412 - GABR SAAD Z M [GB]
- [A] FR 2667212 A1 19920327 - PHL AUDIO [FR]
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