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:
Dec. 01, 2009
Filed:
Mar. 10, 2004
Akiko Hirao, Chiba, JP;
Hisashi Yamada, Kanagawa, JP;
Kazuki Matsumoto, Kanagawa, JP;
Hideyuki Nishizawa, Tokyo, JP;
Katsutaro Ichihara, Kanagawa, JP;
Akiko Hirao, Chiba, JP;
Hisashi Yamada, Kanagawa, JP;
Kazuki Matsumoto, Kanagawa, JP;
Hideyuki Nishizawa, Tokyo, JP;
Katsutaro Ichihara, Kanagawa, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
The optical information recording medium according to the present invention includes a transparent substrate having a first surface and a second surface, a recording layer that is arranged on the first surface of the transparent substrate, and a reflection layer arranged on the second surface of the transparent substrate. A hologram is recorded in the recording layer when a signal light and a reference light are incident from an incident side opposite to the transparent substrate. An optical density of the recording layer corresponding to the signal light decreases from the incident side toward the transparent substrate.