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:
Jan. 22, 2002
Filed:
Sep. 09, 1999
Hideyo Kamiyama, Tokorozawa, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
A servo device for controlling a reading operation of a pickup in a recording medium player, which generates a servo error signal indicative of an amount of deviation of a position at which the pickup of the recording medium player is reading for playing a recording medium. The servo device detects a blemish at a reading point focused by the pickup on the recording medium to generate a blemish detecting signal when a blemish is detected, and generates a servo hold signal based on a low frequency component of the servo error signal. The servo hold signal includes, immediately after the generation of the blemish detecting signal, a signal of opposite polarity to the polarity of the servo error signal immediately before generation of the blemish detecting signal. Further, the servo device controls the reading operation of the pickup in accordance with the servo hold signal in place of the servo driving signal during the time that the blemish detecting signal is generated.