Title:
MAGNETIC MEDIUM AND ITS MANUFACTURE
Document Type and Number:
Japanese Patent JPH03200011
Kind Code:
A
Abstract:
PURPOSE:To easily and surely magnetize a face to be magnetized at a fine pitch and to obtain a high output by intermittently forming many magnetized parts consisting of magnetic films on the face to be magnetized of a base material consisting of a non-magnetic body. CONSTITUTION:A magnetic film is formed on the upper surface of the base material 11 consisting of a cupper-made disk. Masking materials are formed on the upper peripheral edge of the magnetic film at a prescribed pitch and then the magnetic film on the base material 11 is etched by ion beam etching to remove the film. Then the masking material is removed by dipping it into a peeling solution to form many magnetized parts 12 consisting of magnetic films each of which has a plane rectangular shape on the upper peripheral edge part of the base material 11. Then magnetizing yokes 15, 16 are arranged on the upper and lower parts of the base material 11 to magnetize the base material 11.
Inventors:
HARADA MUTSUMI
HAYASHI YOSHINORI
HOSHI TOSHIHARU
HAYASHI YOSHINORI
HOSHI TOSHIHARU
Application Number:
JP34320989A
Publication Date:
September 02, 1991
Filing Date:
December 28, 1989
Export Citation:
Assignee:
YAMAHA CORP
International Classes:
G01B7/30; G01B7/00; G01D5/245; G11B5/66; G11B5/76; G11B5/85; (IPC1-7): G01B7/30; G01D5/245; G11B5/66; G11B5/85
Attorney, Agent or Firm:
Masatake Shiga (2 outside)