Invention Grant
- Patent Title: Magnetic transfer master disk, its manufacturing method and magnetic transfer method
- Patent Title (中): 磁传输主盘,其制造方法和磁转移方式
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Application No.: US11347326Application Date: 2006-02-06
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Publication No.: US07674535B2Publication Date: 2010-03-09
- Inventor: Kenji Ichikawa , Shiho Kamisawa , Seiji Kasahara
- Applicant: Kenji Ichikawa , Shiho Kamisawa , Seiji Kasahara
- Applicant Address: JP Tokyo
- Assignee: FUJIFILM Corporation
- Current Assignee: FUJIFILM Corporation
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2005-031958 20050208; JP2005-039703 20050216
- Main IPC: G11B5/66
- IPC: G11B5/66 ; G11B5/851 ; G11B5/858

Abstract:
The present invention provides a magnetic transfer master disk comprising: a master substrate formed by a metal plate, on a surface of which a protruding and recessed pattern corresponding to transfer information is transferred by electroforming, the metal plate being composed of two or more electroforming layers that are different from each other in crystal orientation; and a magnetic layer formed on the protruding and recessed pattern of the master substrate in order to eliminate warpage and distortion of the master disk even if the close contact pressure is increased during transferring magnetic information such as format information to a magnetic disk used in a hard disk device and the like.
Public/Granted literature
- US20060177699A1 Magnetic transfer master disk, its manufacturing method and magnetic transfer method Public/Granted day:2006-08-10
Information query
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