Magnetic transfer method and system
AssigneeFuji Photo Film Co., Ltd.
InventorsKazunori Komatsu, Makoto Nagao, Masakazu Nishikawa
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Abstract
The invention provides a magnetic transfer method in which a magnetic transfer master carrier having a magnetic layer at a surface portion of a substrate having an information signal is brought in contact with a magnetic recording medium that is an associated slave medium and a transfer magnetic field is applied to the slave medium. The coercive force Hcs of the slave magnetic recording medium and the transfer magnetic field satisfies the relation: 0.6×Hcs≦transfer magnetic field≦1.3×Hcs
Claims20
A magnetic transfer method in which a magnetic transfer master carrier having a magnetic layer at a surface portion of a substrate having an information signal is brought in close contact with an associated slave medium and a transfer magnetic field is applied to the slave medium, wherein:
- a magnetic field is previously applied to said slave medium in a track direction to initially d.c. magnetize said slave medium in said track direction, and said magnetic transfer master carrier is brought in close contact with said initially d.c. magnetized slave medium to apply said transfer magnetic field to said slave medium in said track direction for magnetic transfer, wherein an angle of inclination of said transfer magnetic field is variable, and wherein a magnetic field having a magnetic field intensity profile having a magnetic field intensity portion exceeding said coercive force Hcs of said slave member at at least one position in said track direction is generated at a part of said track direction to rotate said slave medium or said magnetic field in said track direction, so that said magnetic field for said initial d.c. magnetization of said slave medium in said track direction is applied to said slave medium.
A magnetic transfer system in which a magnetic transfer master carrier having a magnetic layer at a surface portion of a substrate having an information signal is brought in close contact with an associated slave medium and a transfer magnetic field is applied to the slave medium, which comprises:
- initial d.c. magnetization means for previously applying a magnetic field to said slave medium in a track direction to initially d.c. magnetize said slave medium in said track direction, and
- transfer magnetic field application means for applying a transfer magnetic field to said initially d.c. magnetized slave medium in said track direction while said magnetic transfer master carrier is brought in close contact with said initially d.c. magnetized slave medium, wherein an angle of inclination of said transfer magnetic field is variable, and wherein said initial d.c. magnetization means comprises means for generating a magnetic field having a magnetic field intensity profile which has a magnetic field intensity portion exceeding said coercive force Hcs of said slave member at at least one position in said track direction, at a part of said track direction and rotating said slave medium or said magnetic field in said track direction.
Dependencies are inferred from the claim text.