EP 0185833 A1 19860702 - Membrane in plastic materials for loudspeakers.
Title (en)
Membrane in plastic materials for loudspeakers.
Title (de)
Membran aus Kunststoff für Lautsprecher.
Title (fr)
Membrane en matériaux plastiques pour haut-parleurs.
Publication
Application
Priority
EP 84830355 A 19841227
Abstract (en)
The membrane of the acoustic component can be obtained by means of hot compression from the plate material employing in moulding the active part of relieved screened mould in order to generate a reticular system of bright surface with transparent room intervals. The proceeding enables the structural modification to the replies in frequency originated by the different elasticity obtained from the material treated in this way. As a consequence, higher elasticity and membrane resistance can be obtained which allows a wider range of possibilities in the air percussion and consequently a better acoustic yield.
IPC 1-7
IPC 8 full level
H04R 7/12 (2006.01); H04R 31/00 (2006.01)
CPC (source: EP)
H04R 7/122 (2013.01); H04R 31/003 (2013.01)
Citation (search report)
- [Y] US 3835265 A 19740910 - ITAGAKI T
- [Y] DE 976940 C 19640820 - KURT MUELLER K G DR
- [Y] GB 640367 A 19500719 - ACOUSTIC PRODUCTS LTD
- [A] US 3768590 A 19731030 - YOCUM F
- [A] US 3862376 A 19750121 - WHITE STANLEY F
Designated contracting state (EPC)
AT BE CH DE FR GB IT LI LU NL SE
DOCDB simple family (publication)
DOCDB simple family (application)
EP 84830355 A 19841227