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:
Jul. 05, 2011
Filed:
Oct. 25, 2006
Tetsuhiro Sakamoto, Kanagawa, JP;
Takashi Shimouma, Kanagawa, JP;
Shigeki Takagawa, Kanagawa, JP;
Jun Nakano, Tokyo, JP;
Goro Fujita, Kanagawa, JP;
Tetsuhiro Sakamoto, Kanagawa, JP;
Takashi Shimouma, Kanagawa, JP;
Shigeki Takagawa, Kanagawa, JP;
Jun Nakano, Tokyo, JP;
Goro Fujita, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical recording medium is provided. The optical recording medium includes at least a reflective film and a cover layer on a substrate; main data by a combination of pit and land are recorded on the substrate; a write-once recording is made to be possible on the reflective film by irradiating a laser light; sub-data are recorded by a mark that is formed by the irradiation of laser light for the write-once recording with respect to the reflective film; a reproducing signal level at portion where said mark is formed increases for the land of specified length; the mark by which the reproduced level decreases at the portion where the mark is formed is formed for an optical disc recording medium manufactured by physical copy; the reflective film is composed of an Ag-alloy film of AgX(0<x<100); and the X is selected from Ti, W, Ta, V, Mo, Nb and Zr.