Master information carrier for magnetic transfer and its...

Details Master information carrier for magnetic transfer and its... Master information carrier for magnetic transfer and its...

2005-04-12

2008-12-16

Nguyen, Nam X (Department: 1795)

Electrolysis: processes, compositions used therein, and methods

Electroforming or composition therefor

Recording device

C205S067000, C205S070000, C428S848300

Reexamination Certificate

active

07465383

ABSTRACT:
A master information carrier for magnetic transfer includes a master substrate made of metal, including an embossed pattern corresponding to information to be transferred. The master substrate is produced by laminating a metal disk with a predetermined thickness on an original disk, on which an embossed pattern is formed, by electroforming, peeling off the metal disk and die-cutting a disk in a desired size. An outer diameter of the metal disk is at least 1.7 times longer than an outer diameter of the die-cut master substrate. When the metal disk is peeled off from the original disk, deformation due to the forces acting from the side of the outer circumference is reduced. The flatness of the metal disk is ensured and the transfer qualities are improved. Further, a step of removing distortion of the metal disk, caused at the time of peeling off the metal disk, may also be provided.

REFERENCES:
patent: 5756130 (1998-05-01), Umebayashi et al.
patent: 6759183 (2004-07-01), Nagao et al.
patent: 6772507 (2004-08-01), Aoki
patent: 2001/0028964 (2001-10-01), Nagano et al.
patent: 2004/0211752 (2004-10-01), Aoki
patent: 6-333272 (1994-12-01), None
patent: 2002-92870 (2002-03-01), None

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