Title:
DIAPHRAGM FOR SPEAKERS
Document Type and Number:
Japanese Patent JPS5486321
Kind Code:
A
Abstract:
PURPOSE: To enhance volume productivity by coating a specific resin solution added with inorganic powder to a diaphragm surface composed of pulp, etc.
CONSTITUTION: After natural cellulose, e.g., pulp, is beaten, a sizing agent, paper strength intensifying agent, etc. are added, and a pulp base material layer 1 is sheeted. To the mixed solution comprising adding melamine-, epoxy base thermosetting resins to a soft binder such as of rubber-, acrylic base resins, etc. is further added inorgaic powder such as of ZnO, CaCO3, TiO2, etc. as a filler for fine adjustment of surface hardness and improvement of finish appearnce. This mixed solution is coated on the surface of the layer 1, whereby the resin layer 2 is formed.
Inventors:
MATSUURA SHIYOUJI
TSUBOI KOUICHI
SAITOU MASAHIRO
TSUBOI KOUICHI
SAITOU MASAHIRO
Application Number:
JP15715477A
Publication Date:
July 09, 1979
Filing Date:
December 21, 1977
Export Citation:
Assignee:
SHARP KK
International Classes:
H04R7/02; (IPC1-7): B32B27/12; G10K13/00
Domestic Patent References:
| JPS5251930A | 1977-04-26 | |||
| JPS50104634A | 1975-08-18 | |||
| JPS5197422A | 1976-08-27 |
Foreign References:
| US3508626A | 1970-04-28 |