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:
Jun. 26, 2012
Filed:
Oct. 16, 2009
Yoshiaki Komma, Osaka, JP;
Joji Anzai, Osaka, JP;
Hiroyasu Inoue, Nagano, JP;
Takashi Kikukawa, Nagano, JP;
Koji Mishima, Nagano, JP;
Jun Nakano, Tokyo, JP;
Manami Miyawaki, Kanagawa, JP;
Shigeki Takagawa, Kanagawa, JP;
Yoshiaki Komma, Osaka, JP;
Joji Anzai, Osaka, JP;
Hiroyasu Inoue, Nagano, JP;
Takashi Kikukawa, Nagano, JP;
Koji Mishima, Nagano, JP;
Jun Nakano, Tokyo, JP;
Manami Miyawaki, Kanagawa, JP;
Shigeki Takagawa, Kanagawa, JP;
Abstract
An object of the invention is to provide an optical recording medium and a method for producing an optical recording medium that enable to improve the quality of a servo signal and a reproduction signal. The optical recording medium satisfies: t−t≧1 μm, t−t≧1 μm, t≧10 μm, and t−(t+t+t)≧1 μm, where tis a thickness between a surface of the optical recording medium, and the first information recording surface, tis a thickness between the first optical recording surface and the second information recording surface, tis a thickness between the second optical recording surface and the third information recording surface, and tis a thickness between the third optical recording surface and the fourth information recording surface.