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:
Oct. 24, 1995
Filed:
Jul. 22, 1994
Makoto Iida, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A digital filter (5) filters outputs of an A/D converter (3). An adder (10) adds outputs from the digital filter (5) and delayed outputs from a delay (9). An extracting circuit takes out driving data (11) from the added data. Error data, which are remaining data of the added data after extraction of the driving data by the extracting circuit (6) are delayed a predetermined period of time by a delay (9) and inputted to the adder (10). A driving unit (9) drives an optical system (2) according to the driving data (11). The error data (12) are fed back and added to outputs of the digital filter (5), thereby improving accuracy in driving of the optical disk system and, as a result, obtaining reliable controllability and high accuracy in positioning in the optical disk system.
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