Invention Grant
US08315017B2 Magnetic recording medium, magnetic signal reproduction system and magnetic signal reproduction method 有权
磁记录介质,磁信号再现系统和磁信号再现方法

  • Patent Title: Magnetic recording medium, magnetic signal reproduction system and magnetic signal reproduction method
  • Patent Title (中): 磁记录介质,磁信号再现系统和磁信号再现方法
  • Application No.: US12662010
    Application Date: 2010-03-29
  • Publication No.: US08315017B2
    Publication Date: 2012-11-20
  • Inventor: Kazutoshi Katayama
  • Applicant: Kazutoshi Katayama
  • Applicant Address: JP Tokyo
  • Assignee: Fujifilm Corporation
  • Current Assignee: Fujifilm Corporation
  • Current Assignee Address: JP Tokyo
  • Agency: Edwards Neils PLLC
  • Agent Jean C. Edwards, Esq.
  • Priority: JP2009-078157 20090327
  • Main IPC: G11B5/708
  • IPC: G11B5/708 G11B5/70
Magnetic recording medium, magnetic signal reproduction system and magnetic signal reproduction method
Abstract:
An aspect of the present invention relates to a magnetic recording medium comprising a magnetic layer comprising a ferromagnetic powder and a binder on a nonmagnetic support. A height of protrusions with a protrusion density of 0.002 protrusion/μm2 or lower on a surface of the magnetic layer as measured by AFM is 40 nm or lower; a density of protrusions that are 15 nm or higher in height on the surface of the magnetic layer as measured by AFM ranges from 0.01 to 0.18 protrusion/μm2; and the protrusions that are 15 nm or higher in height include protrusions formed of carbon black and protrusions formed of a substance with a Mohs' hardness exceeding 7, and an average height of the protrusions formed of carbon black is greater than an average height of the protrusions formed of the substance with a Mohs' hardness exceeding 7.
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