EP 0835040 A1 19980408 - Loudspeaker
Title (en)
Loudspeaker
Title (de)
Lautsprecher
Title (fr)
Haut-parleur
Publication
Application
Priority
- EP 93906856 A 19930331
- JP 2656692 U 19920331
- JP 8815692 U 19921130
Abstract (en)
Loudspeaker having a magnetic circuit with a repulsion magnetic field constituted by disposing two magnets (M1,M2) magnetized in the direction of thickness with the same polarities facing each other, and by sandwiching a center plate (P) made of magnetic material between the magnets, and a voice coil (1) which is disposed on the outer side of the center plate (P) in the repulsion magnetic field to drive a vibrating plate by the voice coil. The loudspeaker has a vibrating plate (2) made of some cone paper or a suspension (2) such as a damper disposed on the outer side of the voice coil. <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP)
H04R 9/02 (2013.01); H04R 9/046 (2013.01); H04R 9/025 (2013.01)
Citation (search report)
- [X] US 3201529 A 19650817 - SURH PHILIP C
- [PX] EP 0531691 A2 19930317 - NOKIA DEUTSCHLAND GMBH [DE]
- [A] DE 3730305 C1 19890323 - DAIMLER BENZ AG
- [A] US 3351719 A 19671107 - HERBERT SCHOENGOLD
- [A] PATENT ABSTRACTS OF JAPAN vol. 008, no. 281 (E - 286) 21 December 1984 (1984-12-21)
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
EP 0587910 A1 19940323; EP 0587910 A4 19950118; DE 69332569 D1 20030123; DE 69332569 T2 20030821; DE 835040 T1 19980903; EP 0835040 A1 19980408; EP 0835040 B1 20021211; JP 2592066 Y2 19990317; JP H0593197 U 19931217; WO 9320666 A1 19931014
DOCDB simple family (application)
EP 93906856 A 19930331; DE 69332569 T 19930331; DE 97118656 T 19930331; EP 97118656 A 19930331; JP 8815692 U 19921130; JP 9300401 W 19930331