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. 18, 2011
Filed:
May. 28, 2007
Masaru Yamaoka, Osaka, JP;
Mamoru Shoji, Osaka, JP;
Keiji Nishikiori, Kyoto, JP;
Makoto Usui, Osaka, JP;
Mitsuro Moriya, Nara, JP;
Masaru Yamaoka, Osaka, JP;
Mamoru Shoji, Osaka, JP;
Keiji Nishikiori, Kyoto, JP;
Makoto Usui, Osaka, JP;
Mitsuro Moriya, Nara, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An optical disc includes a reflective film formed on concave and convex marks after the concave and convex marks are synchronized with the integral multiple of a channel bit length and formed in accordance with modulated main information. Thereafter, continuous or intermittent laser light synchronized with the integral multiple of the channel bit length is irradiated at intervals longer than the longest one of the concave and convex marks in accordance with a spiral track formed in a circumferential direction of the concave and convex marks, whereby an optical characteristic of the reflective film is changed to form a recordable mark and sub-information necessary to reproduce the main information is recorded in a superimposition manner.