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:
Jul. 30, 1996
Filed:
Jun. 16, 1995
Naruhiro Okamoto, Kyoto, JP;
Hiroyuki Watanabe, Ooizumi-machi, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A signal read out from a disk by a pickup is written in a RAM. The signal written in the RAM is read out at a speed lower than the writing speed to perform a reproduction operation. When there is an abnormality of the servo, the writing to the RAM is stopped and the servo is returned to a predetermined operation point to perform a re-try. After the occurrence of the abnormality of the servo, whether a return data and a data on a position just in front of a position where the servo abnormality occurs coincide with each other or not is determined. When the data coincide with each other, data on the position where the abnormality occurs and positions subsequent thereto are written in the RAM. When the data do not coincide with each other, the servo repeats the re-try for a predetermined period of time.