Lens position control method, lens position control...

Details Lens position control method, lens position control... Lens position control method, lens position control...

2006-07-18

2011-12-27

Hindi, Nabil (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053230

Reexamination Certificate

active

08085627

ABSTRACT:
A lens position control method is disclosed. Either an objective lens or a master disc having a resist material film on its substrate is moved, thereby changing a distance between the objective lens and the master disc surface. A return laser beam transmitted through the objective lens and reflected by the master disc surface is detected by a photodetector. The movement of either of them is stopped when the master disc is located near a focal point of the objective lens and the return laser beam is detected. Limit data is rewritten to data corresponding to a position obtained by adding a movement permission amount smaller than a working distance of the objective lens to the stop position. When the return laser beam is not detected, the movement which changes the distance between them is stopped at a position corresponding to the limit data.

REFERENCES:
patent: 6564009 (2003-05-01), Owa et al.
patent: 6721244 (2004-04-01), Kubota

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