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:
Sep. 05, 2000
Filed:
Aug. 17, 1998
Applicant:
Inventors:
Michikazu Horie, Kanagawa, JP;
Takashi Ohno, Kanagawa, JP;
Hideyuki Kubo, Kanagawa, JP;
Masae Kubo, Kanagawa, JP;
Hironobu Mizuno, Kanagawa, JP;
Masaaki Mizuno, Kanagawa, JP;
Haruo Kunitomo, Okayama, JP;
Ken-Ichi Takada, Miyagi, JP;
Assignee:
Mitsubishi Chemical Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
3692754 ; 3692751 ; 369 13 ;
Abstract
An optical phase-change disc comprises a substrate having thereon a spiral groove or concentric grooves for guiding a focused light beam, and a layer structure including a recording layer and protective layers sandwiching therebetween the recording layer. The groove has wobble for recording ATIP (absolute time information) or ADIP (address information). The following relationship between the groove width GW, beam diameter R.sub.0 and wobble amplitude a.sub.w :