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:
Dec. 27, 2011
Filed:
Oct. 07, 2008
Seung-hoon Kim, Daejeon, KR;
Kwan-ho Chun, Seoul, KR;
Seung-hoon Kim, Daejeon, KR;
Kwan-ho Chun, Seoul, KR;
Toshiba Samsung Storage Technology Korea Corporation, Suwon-si, KR;
Abstract
A method and apparatus for controlling a focus servo of an optical disk drive is provided. The focus servo controlling method includes the operations of, when an operating mode enters into a focus pull-in mode, detecting a period of time that satisfies a first threshold condition, the first threshold condition set to determine a duration in which a focal point of an optical signal emitted from a pickup is passing through a cover layer of a disk, the determination made by using a first signal proportional to a detected portion of an optical signal reflected by the disk, and preventing focus servo control from being performed during a detected period of time that first satisfies the first threshold condition since the operating mode entered into the focus pull-in mode.