Apparatus and method for optical storage system focus control

Details Apparatus and method for optical storage system focus control Apparatus and method for optical storage system focus control

2006-05-16

2006-05-16

Wellington, A. L. (Department: 2652)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

Reexamination Certificate

active

07046594

ABSTRACT:
A method of adjusting the focus control for an optical storage system where light is reflected from a surface towards a lens. The method includes receiving a reflected light in the form of a spot, dividing the spot into a plurality of areas, generating an adjustment signal based on the relationship between the plurality of areas to determine the variation between the center point of the spot and a desired center point for the spot, combining the adjustment signal with an existing focus error signal to obtain a modified focus error signal, and utilizing the modified focus error signal to control the position of the sensor.

REFERENCES:
patent: 5283774 (1994-02-01), Mashimo
patent: 5663942 (1997-09-01), Ishibashi et al.
patent: 5787060 (1998-07-01), Ando

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