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. 28, 1993
Filed:
Jul. 18, 1991
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
The information recording medium comprises a substrate provided with a prepit area and a pregroove area, a dye layer on the substrate and a reflecting layer on the dye layer, wherein the dye layer is a continuous layer formed on both the prepit area and the pregroove area, and the prepit area has a high modulation degree not less than 50%. Its embodiments are as follows: A medium in which a difference between an optical thickness of the dye layer on the bottom portion of a pregroove or a prepit and that of the dye layer on the land portion or a portion between prepits is not more than .lambda./8; one in which a prepit has a half width of 0.2 to 1.4 .mu.m and a depth of 150 to 400 nm, the pregroove has a half width of 0.2 to 1.4 .mu.m and a depth of 70 to 200 nm, the depth of the prepit is larger than the depth of the pregroove by not less than .lambda./8; and one in which wherein a relationship between a depth of a prepit and a thickness of said dye layer on the prepit and that between a depth of a pregroove and a thickness of a dye layer on the pregroove satisfies the specific conditions; and one in which least one of the prepit area and the pregroove area may be present in two or more places are disclosed.