Invention Grant
- 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
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Application No.: US12662010Application Date: 2010-03-29
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Publication No.: US08315017B2Publication 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

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.
Public/Granted literature
- US20100246073A1 Magnetic recording medium, magnetic signal reproduction system and magnetic signal reproduction method Public/Granted day:2010-09-30
Information query
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