Title (en)

LOUDSPEAKER DIAPHRAGM

Publication

EP 0126841 A3 19860312 (DE)

Application

EP 84100977 A 19840201

Priority

DE 3319423 A 19830528

Abstract (en)

[origin: EP0126841A2] A loudspeaker diaphragm consisting of two paper layers between which there is a layer which consists of a plastic material having small discontinuities (6), a modulus of elasticity of more than 25,000 daN/cm<2>, and a thickness at least equal to that of one of the paper layers and at the most three times this thickness, and which bonds the two paper layers together over their entire area. This diaphragm is particularly lightweight and rigid. <IMAGE>

IPC 1-7

H04R 7/10; H04R 7/02

IPC 8 full level

H04R 7/02 (2006.01); H04R 7/10 (2006.01)

CPC (source: EP)

H04R 7/02 (2013.01); H04R 7/10 (2013.01)

Citation (search report)

• DE 974931 C 19610608 - PODSZUS EMIL DR
• FR 2297536 A1 19760806 - MANGER J W [DE]
• DE 1925119 A1 19691127 - NIPPON MUSICAL INSTRUMENTS MFG
• WIRELESS WORLD, Dezember 1958, Seiten 564-569, I.P.C. Business Press Ltd., Hayloards Heath, Sussex, GB; D.A. BARLOW: "Rigidity of loudspeaker Diaphragms, advantages of sandwich construction"
• PATENT ABSTRACTS OF JAPAN, Band 6, Nr. 259 (E-149)[1137], 17. Dezember 1982; & JP-A-57 155 897 (MATSUSHITA DENKI SANGYO K.K.) 27.09.1982
• PATENTS ABSTRACTS OF JAPAN, Band 6, Nr. 67 (E-104)[945], 28. April 1982; & JP - A - 57 9194 (PIONEER K.K.) 18.01.1982
• PATENT ABSTRACTS OF JAPAN, Band 6, Nr. 67 (E-104)[945], 28. April 1982; & JP-A-57 009 194 (PIONEER K.K.) 18.01.1982

Designated contracting state (EPC)

AT BE CH FR GB IT LI LU NL SE

DOCDB simple family (publication)

EP 0126841 A2 19841205; EP 0126841 A3 19860312; CA 1210338 A 19860826; DE 3319423 A1 19841129; DE 3319423 C2 19850328

DOCDB simple family (application)

EP 84100977 A 19840201; CA 455117 A 19840525; DE 3319423 A 19830528