Lens pull-in method for near-field optical accessing system
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United States of America Patent
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Apr 23, 2013
Grant Date -
Oct 27, 2011
app pub date -
Jan 5, 2011
filing date -
Apr 23, 2010
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Abstract
A lens pull-in method is used in a near-field optical accessing system. When a lens is in a far-field range, the lens is driven to approach a surface of an optical disc in an open loop control state. If the lens enters a near-field range, a first GES level is inputted as a set value and the lens is driven in a close loop control state. When the gap error signal decreases to the first GES level, the set value is changed to a second GES level, which is higher than the first GES level. When the gap error signal increases to the first GES level, the set value is changed to a target GES level, so that the gap error signal is maintained at the target gap error signal.
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