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:
Mar. 08, 2011
Filed:
Oct. 04, 2005
Atsuo Shimizu, Gunma, JP;
Toru Fujii, Gunma, JP;
Masashi Satoh, Gunma, JP;
Isao Okitsu, Osaka, JP;
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
There is provided a new medium structure to record a bar code for copyright protection or the like in an optical information recording medium capable of recording and reproducing information by a laser with respect to a dye. When a laser beamis irradiated and an optical discis rotation in the direction of an arrow F, the dye of a recording layer is decomposed, a mark piece MA of a bar codeis formed, and a substrate is deformed by heat generated by the dye decomposition. Next, the position of the laser beamis shifted to a position where a part overlaps with the mark piece MA, and when the optical disc is similarly rotated in the direction of the arrow F, a mark piece MB is formed to overlap with the mark piece MA. The above processing is repeated, so that the length of a bar is sequentially lengthened, and the bar code with a length along the standard is formed.