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. 31, 2002
Filed:
Apr. 19, 2001
Sony Corporation, Tokyo, JP;
Abstract
An over-writable magneto-optical recording medium in which a recording section has at least a first dielectric layer, a first recording layer, a second recording layer, and a second dielectric layer formed sequentially and a reflective layer and a protective layer formed on the recording section. A groove is formed on the transparent substrate along a recording track, both sidewalls of the groove are formed into an independent wobbling shape, a relationship of 0.470 ≦W/Ø≦0.610 is effectuated where the width of the groove as W, and a relationship of 0.120≦D(&lgr;/n)≦0.142 is effectuated where the depth of the groove as D, and the angle Ø between wall faces of the groove is 150°±10. a relationship of 0.55≦(d /d )≦0.9 is effectuated when assuming the thickness of the first dielectric is d and the reflective layer is d .