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. 11, 1998
Filed:
Apr. 22, 1996
Applicant:
Inventors:
Toshiaki Kashihara, Osaka, JP;
Kiyoshi Tanii, Osaka, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
3692754 ; 3692751 ; 369 58 ;
Abstract
To present a stable tracking signal with less change, in a recording medium possessing a discontinuous control information recording region of track groove and a data region by a continuous track. The track pitch of a preliminarily recorded control information pit portion region 3 is set larger than the track pitch of a data recording region 2 which is a continuous groove in a disk 1, and the tracking signal modulation degree of the both regions is nearly same, so that stable recording and reproducing may be realized.