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. 19, 1999
Filed:
Jul. 27, 1998
Kyuuya Narita, Yokohama, JP;
Toshifumi Kawano, Yokohama, JP;
Hideharu Takeshima, Yokohama, JP;
Masanobu Hodohara, Kurashiki, JP;
Mitsubishi Chemical Corporation, Tokyo, JP;
Abstract
A magneto-optical recording medium having a writing layer formed on a transparent substrate provided with a groove having a flat bottom surface and a flat land, so that writing or readout is carried out on either the groove or the land only by irradiating a laser beam from the substrate side, wherein the sum (.alpha.+.beta.) of a phase shift .alpha. of a reflected light of a readout beam by the substrate and a phase shift .beta. thereof by a layer structure on the transparent substrate, is made to have an opposite sign to a phase shift .gamma. by interference of reflected lights from the groove and the land.