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:
Oct. 24, 2006
Filed:
Apr. 16, 2002
Motoyoshi Murakami, Hirakata, JP;
Masahiro Birukawa, Hirakata, JP;
Tsutomu Shiratori, Tokyo, JP;
Yasuyuki Miyaoka, Yokohama, JP;
Motoyoshi Murakami, Hirakata, JP;
Masahiro Birukawa, Hirakata, JP;
Tsutomu Shiratori, Tokyo, JP;
Yasuyuki Miyaoka, Yokohama, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
According to the present invention, a light beam is radiated to an area between recording tracks while the intensity of a magnetic field from the outside to a magneto-optical recording medium is suppressed to 50 Oe or less, whereby magnetic anisotropy formed between the recording tracks is set to be lower than that of the magnetic layer on the recording tracks, and micro-domains, for example, having a diameter smaller than a half-width of a light beam for reproduction in a film surface direction are formed on recording tracks. Because of this method, the influence of a leakage magnetic field in the magneto-optical recording medium adopting a DWDD reproducing system is alleviated.