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. 04, 2011
Filed:
Jul. 10, 2008
Young-jae Park, Yongin-si, KR;
Joong-gon Kim, Goyang-si, KR;
Noh-cheol Park, Seoul, KR;
Hyun-seok Yang, Seoul, KR;
Young-jae Park, Yongin-si, KR;
Joong-gon Kim, Goyang-si, KR;
Noh-cheol Park, Seoul, KR;
Hyun-seok Yang, Seoul, KR;
Samsung Electronics Co., Ltd., Suwon-si, KR;
Industry-Academic Cooperation Foundation, Yonsei University, Seoul, KR;
Abstract
A gap servo control method and apparatus for increasing a disturbance cancellation capability and decreasing the occurrence of an overshoot in a near-field optical disc drive include: generating an actuator driving signal of a transient response process by using a signal obtained by removing a disturbance contained in the gap error signal using a first band when a level of a gap error signal reaches a first level; and generating the actuator driving signal of the transient response process by using a signal obtained by removing the disturbance contained in the gap error signal using a second band when the level of the gap error signal reaches a second level.