Title (en)

BROAD BAND LOUDSPEAKER PROVIDED WITH A MEMBRANE SURFACE DIVIDED INTO A PLURALITY OF PARTS CORRESPONDING TO A PLURALITY OF FREQUENCY BANDS

Publication

EP 0232760 A3 19881012 (DE)

Application

EP 87100806 A 19870121

Priority

DE 3603537 A 19860205

Abstract (en)

[origin: US4821330A] The invention relates to a wide-band loudspeaker in which the overall diaphragm is divided into an inner and an outer diaphragm sub-area. The inner diaphragm sub-area preferably consists of a dome-shaped cover of the moving-coil support. The outer diaphragm sub-area can be formed as a cone or NAWI diaphragm or as a shaped or moulded body, the shaped body having an at least approximately planar front face and its rear boundary face having the form of a cone or NAWI diaphragm. The outer diaphragm sub-area is connected to the moving-coil support by a frequency-dependent yieldable connection with high damping which at high audiofrequencies practically decouples the outer diaphragm sub-area from the moving-coil support but at low audiofrequencies acts like a rigid connection.

IPC 1-7

H04R 9/06; H04R 7/12

IPC 8 full level

H04R 1/24 (2006.01); H04R 1/28 (2006.01); H04R 7/12 (2006.01); H04R 9/04 (2006.01); H04R 9/06 (2006.01)

CPC (source: EP KR US)

H04R 7/125 (2013.01 - EP US); H04R 9/045 (2013.01 - EP US); H04R 9/06 (2013.01 - KR)

Citation (search report)

• [X] US 2007747 A 19350709 - ABRAHAM RINGEL
• [X] US 2371951 A 19450320 - COOK ELLSWORTH D
• [X] CH 396099 A 19650731 - VILLAMOSSAGI TELEVIZIO ES RADI [HU]
• [A] US 3342286 A 19670919 - STAFFEN BRUNO G
• [A] EP 0147992 A2 19850710 - HARMAN INT IND [US]
• [A] JOURNAL OF THE AUDIO ENGINEERING SOCIETY, Band 25, Nr. 1/2, Januar/Februar 1977, Seiten 15-23, New York, US; J.M. KATES: "Analysis of decoupled-cone loudspeakers"
• [A] JOURNAL OF THE AUDIO ENGINEERING SOCIETY, Band 5, Nr. 1, Januar 1957, Seiten 11-17, New York, US; A.B. COHEN: "Mechanical crossover characteristics in dual diaphragm loudspeakers"

Designated contracting state (EPC)

DE ES FR GB IT

DOCDB simple family (publication)

EP 0232760 A2 19870819; EP 0232760 A3 19881012; EP 0232760 B1 19910410; CN 1012316 B 19910403; CN 87100528 A 19871007; DE 3603537 A1 19870806; DE 3603537 C2 19920723; DE 3769162 D1 19910516; ES 2022158 B3 19911201; JP S6310900 A 19880118; KR 870008485 A 19870926; KR 950011498 B1 19951005; US 4821330 A 19890411

DOCDB simple family (application)

EP 87100806 A 19870121; CN 87100528 A 19870126; DE 3603537 A 19860205; DE 3769162 T 19870121; ES 87100806 T 19870121; JP 2340187 A 19870202; KR 870000876 A 19870204; US 601487 A 19870122