Title:
磁気転写用マスター担体および磁気転写装置並びに磁気転写方法
Document Type and Number:
Japanese Patent JP4249063
Kind Code:
B2
Abstract:
Deformations (distortion/warp) of a master base plate developed during manufacturing are regulated to ensure close contact with a slave medium and quality of magnetic transfer. The master base plate is formed by the following steps. A metal is laminated through electroforming or the like on an irregular pattern corresponding to information to be transferred formed on an original disk. The metal is formed into a disk having a predetermined thickness, which is then peeled off the original disk. The amount of distortion of the master base plate along one rotation at any equidistance radius is less than or equal to 70 mum. Preferably, in the amount of distortion along one rotation at any equidistance radius of the master base plate, the ratio of distortion components beyond secondary distortion component is less than or equal to 20%, and warp is less than or equal to 150 mum.
Inventors:
Naoto Fujiwara
Application Number:
JP2004066482A
Publication Date:
April 02, 2009
Filing Date:
March 10, 2004
Export Citation:
Assignee:
FUJIFILM Corporation
International Classes:
G11B5/73; G03C5/00; G11B5/86; G11B5/82
Domestic Patent References:
| JP2001256644A | ||||
| JP2002092870A |
Attorney, Agent or Firm:
Yanagita Seiji
Go Sakuma
Go Sakuma