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:
Feb. 06, 1996
Filed:
Apr. 28, 1994
Applicant:
Inventors:
Shinji Ohta, Kanagawa, JP;
Hiroyuki Ito, Tokyo, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
367116 ; 369 59 ; 369 54 ; 369 32 ;
Abstract
This invention relates to an optical disc apparatus and the evaluating method of the optical disc apparatus, which emits the light beam to the disc typed recording medium to sequentially form pits and records the desired data, and the asymmetry, etc. can be detected rapidly and surely. The peak value and the bottom value of the reproduced signal are sequentially held to detect the minimum value and the maximum value of the held result, and then the recording system, the characteristics of the disc typed recording medium, or the reproducing system can be evaluated based on the detected result.