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. 05, 1993
Filed:
May. 14, 1992
Yujiro Kaneko, Machida, JP;
Wasaburo Ohta, Yokohama, JP;
Masashi Nakazawa, Yokohama, JP;
Michiaki Shinozuka, Yokohama, JP;
Isao Miyamoto, Yokohama, JP;
Hitoshi Nakamura, Kawasaki, JP;
Toshihiko Yoshio, Yonago, JP;
Masaaki Ishiyama, Hanamaki, JP;
Yuuzi Onodera, Hanamaki, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An optical information recording medium is composed of a transparent substrate, a recording layer provided on the substrate, which is transparent with respect to a light beam for reproducing information recorded in the recording layer, a reflection layer provided on the recording layer, and an anti-reflection layer provided on the back side of the substrate opposite to the recording layer. The anti-reflection layer is composed of a plurality of overlaid layers, and at least one of the layers being a transparent electroconductive layer and the other layers are transparent insulating layers.