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Patent Searching and Data


Title:
MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING AND REPRODUCING DEVICE, AND MAGNETIC RECORDING MEDIUM CARTRIDGE
Document Type and Number:
WIPO Patent Application WO/2021/065019
Kind Code:
A1
Abstract:
Provided is a magnetic recording medium capable of achieving higher-density recording. This magnetic recording medium is tape-shaped and comprises: a base body mainly containing polyester; and a magnetic layer provided over the base body, containing a plurality of magnetic powders, and capable of recording a data signal. The arithmetic mean roughness Ra of the surface of the magnetic layer is 2.5 nm or less, and the PSD of the magnetic layer up to a spatial wavelength of 5 µm is 2.5 µm or less. The mean thickness of the magnetic layer is 90 nm or less. The mean aspect ratio of the magnetic powders is between 1.0 and 3.0 inclusive. The coercive force in the vertical direction is 3,000 oersteds or less. The ratio of the coercive force in the longitudinal direction to the coercive force in the vertical direction is 0.8 or less. The full width at half maximum of an isolated waveform in a reproduction waveform of the data signal is 200 nm or less.

Inventors:
TERAKAWA, Masaru (1-7-1 Konan, Minato-k, Tokyo 75, JP)
YAMAGA, Minoru (1-7-1 Konan, Minato-k, Tokyo 75, JP)
Application Number:
JP2019/042753
Publication Date:
April 08, 2021
Filing Date:
October 31, 2019
Export Citation:
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Assignee:
SONY CORPORATION (Konan Minato-k, Tokyo 75, JP)
International Classes:
G11B5/584; G11B5/70; G11B5/706; G11B5/78; G11B23/30
Attorney, Agent or Firm:
TSUBASA PATENT PROFESSIONAL CORPORATION (15-9 Shinjuku 1-chome, Shinjuku-k, Tokyo 22, JP)
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