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:
Sep. 06, 2005
Filed:
Oct. 29, 1998
Tsutomu Ishii, Nakai-machi, JP;
Katsunori Kawano, Nakai-machi, JP;
Kazuo Baba, Nakai-machi, JP;
Kiichi Ueyanagi, Nakai-machi, JP;
Tsutomu Ishii, Nakai-machi, JP;
Katsunori Kawano, Nakai-machi, JP;
Kazuo Baba, Nakai-machi, JP;
Kiichi Ueyanagi, Nakai-machi, JP;
Fuji Xerox Co., Ltd., Tokyo, JP;
Abstract
An optical recording medium, an optical recording and reproducing method, and an apparatus that can record and reproduce multilevel information at a high density and with a high S/N ratio. Recording light emitted from a light source is collimated by a collimation lens and introduced into a polarization rotary device. Recording light transmitted by the polarization rotary device is focused by an objective lens onto an optical recording medium. In response, a photo-induced birefringence is recorded on the optical recording medium. Multilevel recording is performed by controlling a voltage applied to the polarization rotary device to change a polarization angle θ of recording light. Reproduction is performed by detecting light reflected from the optical recording medium with an analyzer and a detector.