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:
Apr. 27, 1999
Filed:
Sep. 17, 1997
Toshiyuki Shimada, Kadoma, JP;
Mamoru Shoji, Takatsuki, JP;
Takashi Ishida, Yawata, JP;
Shunji Ohara, Higashiosaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka-fu, JP;
Abstract
An optical disk and optical disk apparatus used for accurately reproducing and recording information regardless of the physical distortions of disks and the electrical distortions of a tracking system. This is achieved in the present invention by providing an optical disk apparatus which takes into account the physical fluctuations, such as radial tilt and tangential tilt, and the electrical fluctuations, such as focus errors and tracking errors, and makes appropriate adjustments in the optical disk apparatus accordingly. These adjustments are made based upon relationships existing between a jittering amount of the reproduced signals and the above-mentioned fluctuations. Specifically, the present invention generates a predetermined pattern of marks which, when recorded, are arranged such that a signal reproduced from the predetermined pattern of marks is caused to jitter. Depending on the specific pattern of marks generated, the reproduced signal experiences an amount of jittering that is optimal so as to allow the present invention to make appropriate adjustments.