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:
Aug. 16, 1994
Filed:
Jul. 30, 1991
Applicant:
Inventor:
Tomohisa Yoshimaru, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 59 ; 369 48 ; 369124 ; 307261 ;
Abstract
In this invention, in an optical disk on which information is recorded by a mark length recording method, an average value of detection signals of sync codes recorded on the optical disk beforehand is calculated, and a difference between the average value and a level '0' is determined to be a bias voltage. The bias voltage is superposed on a detection signal of the recorded information, and the signal is binarized by the level '0'.