EP 1237394 A1 20020904 - Magnetic circuit for electrodynamic loudspeaker
Title (en)
Magnetic circuit for electrodynamic loudspeaker
Title (de)
Magnetkreisanordnung für elektrodynamischen Lautsprecher
Title (fr)
Circuit magnétique pour haut-parleur éléctrodynamique
Publication
Application
Priority
FR 0102807 A 20010301
Abstract (en)
The electrodynamic loudspeaker magnetic circuit (1.1) has a basin shaped body (2.1) and a cylindrical center section (9.1). There is a magnetic section (14) with a diameter (8.1) larger than the cylindrical center section. The effect of having the magnetic overlap sections is to limit the movement of the cylindrical center section.
Abstract (fr)
Circuit magnétique pour haut-parleur électrodynamique. Selon l'invention, ce circuit magnétique, du type connu à aimant central, est tel que le diamètre dudit aimant central 8.1 est plus grand que celui du noyau 9.1, de sorte que ledit aimant 8.1 présente une saillie périphérique 14, annulaire et radiale, par rapport au noyau 9.1. On améliore ainsi les performances dudit aimant magnétique. <IMAGE>
IPC 1-7
IPC 8 full level
H04R 9/02 (2006.01)
CPC (source: EP US)
H04R 9/025 (2013.01 - EP US)
Citation (search report)
- [Y] EP 0685983 A2 19951206 - MATSUSHITA ELECTRIC IND CO LTD [JP]
- [A] US 5157731 A 19921020 - MITOBE KUNIO [JP]
- [XAY] PATENT ABSTRACTS OF JAPAN vol. 2000, no. 15 6 April 2001 (2001-04-06)
- [XAY] PATENT ABSTRACTS OF JAPAN vol. 014, no. 252 (E - 0934) 30 May 1990 (1990-05-30)
- [Y] PATENT ABSTRACTS OF JAPAN vol. 017, no. 044 (E - 1312) 27 January 1993 (1993-01-27)
Designated contracting state (EPC)
DE GB IT
DOCDB simple family (publication)
EP 1237394 A1 20020904; FR 2821710 A1 20020906; FR 2821710 B1 20030627; US 2002122558 A1 20020905
DOCDB simple family (application)
EP 02290406 A 20020220; FR 0102807 A 20010301; US 8340702 A 20020227