Magnetic transfer apparatus and method for magnetic...

Details Magnetic transfer apparatus and method for magnetic... Magnetic transfer apparatus and method for magnetic...

2006-03-14

2006-03-14

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Record copying

C360S016000, C360S017000

Reexamination Certificate

active

07012770

ABSTRACT:
A magnetic pattern of a master disc is transferred to both sides of a magnetic recording medium with no displacement. The origin of a magnetic recording medium can be determined by observing the inner or outer periphery of the magnetic recording medium. Back-side alignment marks are formed on the front side of the magnetic recording medium based on the origin thus determined. The back-side alignment marks can be observed with a microscope and front-side alignment marks for the magnetic recording medium can be provided on the back side of the magnetic recording medium. The alignment marks provided on the front/back sides of the magnetic recording medium are aligned with the corresponding alignment marks provided on the master disc, and a magnetic pattern formed on the soft magnetic material of the master disc is can be transferred to the magnetic recording medium.

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“Magnetic Printing Technology”, K. Sato et al.; Abstract; Fuji Electric Journal; vol. 75 No. 3; pp. 173-177 (2002).

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