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:
Jul. 07, 1998
Filed:
Sep. 25, 1995
Applicant:
Inventors:
Yoshinori Honguh, Yokohama, JP;
Toyoki Taguchi, Yokohama, JP;
Hiroshi Hasegawa, Kawasaki, JP;
Tadashi Kobayashi, Chiba, JP;
Naoki Morishita, Yokohama, JP;
Naomasa Nakamura, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428 641 ; 428 644 ; 428 646 ; 428913 ; 43027013 ; 4304951 ; 430945 ; 369100 ; 369121 ; 3692751 ; 369283 ;
Abstract
An optical recording medium, which has a land and a groove on which a record mark is formed, comprises a transparent substrate, an inner protection layer formed on the substrate, a recording material layer formed on the inner protection layer and a reflection layer formed on the outer protection layer. The groove is formed to have a depth of .lambda./6 and the ratio of the thickness of the outer protection layer to the thickness of the recording material layer is set in a range between 0.8 and 1.2.