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:
Apr. 02, 2013
Filed:
Sep. 15, 2010
Hiroyasu Inoue, Tokyo, JP;
Takashi Kikukawa, Tokyo, JP;
Koji Mishima, Tokyo, JP;
Yoshiaki Komma, Kadoma, JP;
Joji Anzai, Kadoma, JP;
Jun Nakano, Tokyo, JP;
Manami Miyawaki, Tokyo, JP;
Shigeki Takagawa, Tokyo, JP;
Hiroyasu Inoue, Tokyo, JP;
Takashi Kikukawa, Tokyo, JP;
Koji Mishima, Tokyo, JP;
Yoshiaki Komma, Kadoma, JP;
Joji Anzai, Kadoma, JP;
Jun Nakano, Tokyo, JP;
Manami Miyawaki, Tokyo, JP;
Shigeki Takagawa, Tokyo, JP;
Abstract
An optical recording medium having three or more information recording layers reduces crosstalk caused by multi-reflected beams and improves signal quality. In the optical recording medium having three or more information recording layers, the refractive index of a plurality of intermediate layers disposed between adjacent information recording layers is greater than the refractive index of a cover layer disposed between a light incident surface and an information recording layer being the closest from the light incident surface.