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. 02, 1994
Filed:
May. 13, 1993
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N / ; G11B / ; G11B / ;
U.S. Cl.
CPC ...
369 59 ; 369 54 ; 360 49 ;
Abstract
A recording/reproducing apparatus detecting a starting position of each data recording block or sector on a data recording medium, such as an optical disk. A VFO pattern and a CRC code are recorded at a starting position of each of the sectors. The VFO pattern and the CRC code are utilized for detecting a starting position of each sector with no predetermined pattern or sector mark, on the recording medium, which is dedicated for the starting position detection. This improves data formatting efficiency of the recording medium while maintaining the accuracies of automatic focusing and tracking even in a system employing pit-edge recording/reproducing.