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. 22, 2011
Filed:
Dec. 05, 2008
Tetsuhiro Sakamoto, Kanagawa, JP;
Jun Nakano, Tokyo, JP;
Takayuki Asahina, Shizuoka, JP;
Hideo Kawachi, Tokyo, JP;
Yoshitake Yanagisawa, Shizuoka, JP;
Makoto Tsukahara, Shizuoka, JP;
Inho Cho, Gyeongsangnam-do, JP;
Tetsuhiro Sakamoto, Kanagawa, JP;
Jun Nakano, Tokyo, JP;
Takayuki Asahina, Shizuoka, JP;
Hideo Kawachi, Tokyo, JP;
Yoshitake Yanagisawa, Shizuoka, JP;
Makoto Tsukahara, Shizuoka, JP;
Inho Cho, Gyeongsangnam-do, JP;
Sony Corporation, Tokyo, JP;
Abstract
An optical disk read only memory having an information recording surface with a concave-convex pattern formed on the basis of a first signal and a reflective film covering the surface. The disc medium includes: an additional information recording section formed on a recording track of a first data string; and a second data string including a mark of removing or reducing the reflective film. The modulation methods of the first and the second data strings are identical, and Lh(n)>Lp(n) and Wh(n)>(Wp(n)+Wp(n))/2 are satisfied, where a reference clock cycle is T, a data length is nT, a length and a width of the mark are Lh(n) and Wh(n), a length and a width of a base of the pit are Lp(n), and Wp(n), a length and a width of a top face of the pit is Lp(n) exceeding Lp(n), and Wp(n) exceeding Wp(n).