Title:
PRODUCTION OF ORIGINAL DISC FOR GROOVED MAGNETIC RECORDING DISCS
Document Type and Number:
Japanese Patent JPS5275305
Kind Code:
A
Abstract:
PURPOSE: A process for production of a master plate for simplification of the shape of reproduction head.
Inventors:
SUZUKAWA HIROYUKI
TAKAYAMA JIYUN
KAZAMI SHINICHI
NAKAI JIYUN
UMEDA KENKICHI
TAKAYAMA JIYUN
KAZAMI SHINICHI
NAKAI JIYUN
UMEDA KENKICHI
Application Number:
JP15167475A
Publication Date:
June 24, 1977
Filing Date:
December 19, 1975
Export Citation:
Assignee:
SONY CORP
International Classes:
G11B5/82; G11B5/73; G11B5/84; (IPC1-7): G11B5/82; G11B5/84