The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 19, 2010
Filed:
Mar. 29, 2006
Yanlong Che, Odawara, JP;
Yanlong Che, Odawara, JP;
FUJIFILM Corporation, Tokyo, JP;
Abstract
A method for manufacturing a master disk for magnetic transfer, comprising the steps of electroforming a master substrate of a metal disk with a surface on which an convexoconcave pattern corresponding to information to be transferred is transferred using a reverse die with a reversed convexoconcave pattern, and forming a magnetic layer on the convexoconcave pattern of the master substrate, the method comprising the steps of: a conductive layer forming step to form a conductive layer with a thickness ton a surface of the reverse die; an initial electroforming step to form a first plated layer with a thickness tequal to or more than the thickness tof the conductive layer by plating a surface of the conductive layer at a current density of 0.35 A/dmor less; and a main electroforming step to form a second plated layer by plating a surface of the first plated layer at a current density of 0.35 A/dmor more.