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:
Feb. 22, 2005
Filed:
Jan. 30, 2003
Yasuaki Ban, Hirakata, JP;
Keizo Miyata, Yawata, JP;
Taizou Hamada, Katano, JP;
Kouji Taniguchi, Yokohama, JP;
Masaya Sakaguchi, Katano, JP;
Yasuaki Ban, Hirakata, JP;
Keizo Miyata, Yawata, JP;
Taizou Hamada, Katano, JP;
Kouji Taniguchi, Yokohama, JP;
Masaya Sakaguchi, Katano, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
The master information recording apparatus 100 includes a master information carrier, a master information carrier facing member, and a magnetic field applying member. A ferromagnetic thin film pattern formed on the surface of the master information carrier includes not less than two kinds of different patterns each having a different pattern angle showing an angle with respect to the direction of the relative movement between a magnetic head and a rotating magnetic recording medium. The magnetic field applying unit applies a magnetic field along the direction, which is perpendicular to the direction shown by an angle that is smaller than the pattern angle of the maximum pattern and larger than the minimum pattern angle of the pattern among the not less than two kinds of patterns.