发明名称 |
Method and apparatus for ocntrolling objective lens to prevent disc from being scratched by the objective lens |
摘要 |
A method and apparatus preventing a disc from being scratched by an objective lens. A focus pull-in operation is performed. If a level of a pull-in signal remains lower than a predetermined critical level for a predetermined critical period of time or more, the objective lens is controlled so as to move away from the disc.
|
申请公布号 |
US2004095858(A1) |
申请公布日期 |
2004.05.20 |
申请号 |
US20030627973 |
申请日期 |
2003.07.28 |
申请人 |
CHOI BYOUNG-HO;JUNG SOO-YUL;MA BYUNG-IN;PARK IN-SIK |
发明人 |
CHOI BYOUNG-HO;JUNG SOO-YUL;MA BYUNG-IN;PARK IN-SIK |
分类号 |
G11B19/04;G11B7/085;G11B7/09;G11B7/12;(IPC1-7):G11B7/00 |
主分类号 |
G11B19/04 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|