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. 04, 1995
Filed:
Apr. 12, 1994
Hajime Utsunomiya, Nagano, JP;
Masanori Shibahara, Nagano, JP;
TDK Corporation, Tokyo, JP;
Abstract
A magneto-optical disk is made up of a disk form of substrate including on its surface a recessed area having at least one of a groove and pits, and a recording layer provided such that it covers the recessed area. The geometry of at least one of the groove and pits is designed to conform to .theta..sub.10 .gtoreq..theta..sub.50 and .theta..sub.50 >.theta..sub.90 where .theta..sub.10, .theta..sub.50 and .theta..sub.90 are respectively the angles that tangential lines make with horizontal lines at 10%, 50% and 90% depth positions of a side wall of the recess in the diametrical direction of the substrate. This magneto-optical disk is improved in terms of the push-pull signal level, radial contrast, skew margin and C/N.