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:
Nov. 11, 2003
Filed:
Jul. 03, 2001
Tatsuaki Ishida, Shiga, JP;
Taizou Hamada, Osaka, JP;
Hideyuki Hashi, Osaka, JP;
Keizo Miyata, Osaka, JP;
Yasuaki Ban, Osaka, JP;
Hiromi Kita, Nara, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A master information carrier ( ) with an arranged pattern formed of a ferromagnetic film in a shape corresponding to information signals is superposed on a magnetic recording medium ( ) and the arranged pattern formed of a ferromagnetic film is magnetized with a magnetizing head ( ), thus transfer-recording the arranged pattern into the magnetic recording medium as a magnetized pattern. The magnetizing head includes an annular magnetic circuit with a gap, and a strength of a magnetic field applied to the master information carrier by magnetic flux leaking from portions other than the gap is set to be 20% or less of that of a magnetic field applied to the master information carrier by magnetic flux leaking from the gap. Quality deterioration due to various conditions during recording can be prevented and uniform recording with less variation depending on position on the magnetic recording medium is achieved.