Focus offset calibration

Details Focus offset calibration Focus offset calibration

2005-08-02

2008-10-28

Hindi, Nabil Z (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S047100

Reexamination Certificate

active

07443772

ABSTRACT:
A series of signals is applied to a lens actuator of a disc media marking device to respectively position a lens at a series of distances from an optical disc. A mark is formed on the optical disc at each of the distances of the lens from the optical disc by passing a light beam through the lens and onto the optical disc. The darkest of the marks is determined. The signal applied to the actuator corresponding to the darkest mark is determined.

REFERENCES:
patent: 7250974 (2007-07-01), Koyanagi
patent: 2004/0136279 (2004-07-01), Koll et al.

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