Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2007-01-30
2007-01-30
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
Reexamination Certificate
active
10319566
ABSTRACT:
In a magnetic recording medium including a glass substrate (1) having a principal surface on which at least a magnetic layer (4) is formed, the magnetic recording medium has a coercive force of 2500 oersted or more in a circumferential direction thereof. The principal surface of the glass substrate is provided with a texture having a predetermined surface roughness so that the magnetic layer is given circumferential magnetic anisotropy. The magnetic recording medium further includes a magnetic anisotropy inducing layer (2) formed between the glass substrate and the magnetic layer so that the magnetic recording medium has an oriented ratio (OR) of 1.1 or more. The oriented ratio (OR) is defined as a ratio of a magnetic characteristic in circumferential direction to another magnetic characteristic in the radial direction.
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Machine translation of JP 11219511, Aug. 1999.
Machine translation of JP 2001209927, Aug. 2001.
Machine translation of JP 2001-331934, Nov. 2001.
Kawai Hisao
Tanaka Hirotaka
Uemura Masaki
Umezawa Teiichiro
Hoya Corporation
Hoya Magnetics Singapore Pte. Ltd.
Rickman Holly
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