EP 0062600 B1 19850626 - ELECTRODYNAMIC LOUDSPEAKER FOR LOW AND MEDIUM SOUND FREQUENCIES
Title (en)
ELECTRODYNAMIC LOUDSPEAKER FOR LOW AND MEDIUM SOUND FREQUENCIES
Publication
Application
Priority
FR 8106510 A 19810401
Abstract (en)
[origin: US4472605A] An electrodynamic loudspeaker radiates sound in all directions and with a high output for a low and medium sound frequencies. It comprises two hemispherical movable diaphragms which are arranged on either side of a disc-shaped carrier part. The diaphragms are connected with the carrier part by flanges and constitute a pulsating sphere. In this sphere and connected in each case with one of the diaphragms are actuating units with permanent magnets and in each case, an oscillatory coil. Each oscillatory coil is connected to its respective diaphragm through stiff transition parts, preferably in the form of spherical shells. Openings are provided for an atmospheric pressure equalization between the interior and exterior of the breathing sphere.
IPC 1-7
IPC 8 full level
H04R 9/06 (2006.01); H04R 1/40 (2006.01); H04R 1/22 (2006.01)
CPC (source: EP US)
H04R 1/403 (2013.01 - EP US); H04R 1/227 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE CH DE GB IT LI NL SE
DOCDB simple family (publication)
EP 0062600 A1 19821013; EP 0062600 B1 19850626; AT E14062 T1 19850715; DE 3264396 D1 19850801; FR 2503516 A1 19821008; FR 2503516 B1 19860207; JP S5840997 A 19830310; US 4472605 A 19840918
DOCDB simple family (application)
EP 82710017 A 19820330; AT 82710017 T 19820330; DE 3264396 T 19820330; FR 8106510 A 19810401; JP 5148982 A 19820331; US 35430582 A 19820303