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, 2004
Filed:
Apr. 17, 2000
Mitsuya Okada, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
An information recording medium and an information reproduction apparatus that can substantially increase the capacity for recorded information. A preformat pit array exists on the extension of the boundary between a concave portion and a convex portion and includes information on both sectors across the boundary. An adjustment pit array precedes the preformat pit array in the advancing direction of light that reproduces information recorded on an information recording medium. The information reproduction apparatus adjusts the amplifying rate so that the level of a signal from the adjustment pit array becomes equal to a reference level required to reproduce the information correctly. The apparatus then uses this amplifying rate to correctly reproduce the information in the preformat pit array