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:
Jun. 07, 2005
Filed:
Jun. 03, 2003
Hiroyuki Awano, Noda, JP;
Katsusuke Shimazaki, Toride, JP;
Hiroki Takao, Kitasouma-gun, JP;
Norio Ohta, Tsukuba-gun, JP;
Akiyoshi Itou, Matsudo, JP;
Katsuji Nakagawa, Edogawa-ku, JP;
Hiroyuki Awano, Noda, JP;
Katsusuke Shimazaki, Toride, JP;
Hiroki Takao, Kitasouma-gun, JP;
Norio Ohta, Tsukuba-gun, JP;
Akiyoshi Itou, Matsudo, JP;
Katsuji Nakagawa, Edogawa-ku, JP;
Hitachi Maxell, Ltd., Osaka, JP;
Abstract
A magneto-optical recording medium has magneto-optical recording layers () and reproducing layers (). The information recorded in the reproducing layers are reproduced by means of reproducing light beams () of different wavelengths, respectively. In reproduction, magnetic domains () recorded in the recording layers are transferred in the reproducing layers formed on the respective recording layers, the transferred magnetic domains () are enlarged with an external magnetic field, and the information is reproduced. Since information is recorded and reproduced for each recording layer, the recording density is improved. Further since the reproduction signals are amplified by the magnetic domain enlargement, the C/N is improved.