发明授权
US07616404B2 Magnetic recording medium, magnetic recording and reproducing apparatus, and method for manufacturing magnetic recording medium 失效
磁记录介质,磁记录和再现装置以及磁记录介质的制造方法

  • 专利标题: Magnetic recording medium, magnetic recording and reproducing apparatus, and method for manufacturing magnetic recording medium
  • 专利标题(中): 磁记录介质,磁记录和再现装置以及磁记录介质的制造方法
  • 申请号: US12004074
    申请日: 2007-12-20
  • 公开(公告)号: US07616404B2
    公开(公告)日: 2009-11-10
  • 发明人: Takahiro SuwaKazuya Shimakawa
  • 申请人: Takahiro SuwaKazuya Shimakawa
  • 申请人地址: JP Tokyo
  • 专利权人: TDK Corporation
  • 当前专利权人: TDK Corporation
  • 当前专利权人地址: JP Tokyo
  • 代理机构: Oliff & Berridge, PLC
  • 优先权: JP2006-348243 20061225
  • 主分类号: G11B5/82
  • IPC分类号: G11B5/82
Magnetic recording medium, magnetic recording and reproducing apparatus, and method for manufacturing magnetic recording medium
摘要:
The magnetic recording medium includes a substrate and a recording layer formed in a predetermined concavo-convex pattern over the substrate, and the recording layer includes recording elements each formed as a convex portion of the recording layer. Surface steps are formed in an inner area including a radially innermost portion of a recording area. Each surface step is formed in such a manner that a portion over a concave portion between the recording elements is recessed toward a substrate to a level below a portion over the recording element. The surface steps are formed such that the recording area can be sectioned into an annular area adjoining the inner area and the inner area where height of the surface steps is larger than that in the annular area.
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