Method of controlling focus of optical information storage...

Details Method of controlling focus of optical information storage... Method of controlling focus of optical information storage...

2011-04-05

2011-04-05

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053280, C369S094000

Reexamination Certificate

active

07920449

ABSTRACT:
A focusing control method of an optical information storage media recording and/or reproduction apparatus controlling a focusing operation by moving an objective lens upwards or downwards in a direction towards or away from an optical information storage medium having a plurality of data layers includes receiving a focusing lead-in command signal to focus an optical beam on a target data layer, compensating for spherical aberration with respect to the target data layer, detecting a focus error signal based on an intensity of the optical beam reflected from the optical information storage medium and condensed by an optical detector, identifying the target data layer using an amplitude or a frequency of the focus error signal, and focusing the optical beam on the target data layer by moving the objective lens in an opposite direction from a direction in which the objective lens is initially moved.

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International Search Report issued on Apr. 21, 2008 in PCT International Application No. PCT/KR2008/000019.

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