Apparatus and method for dynamic tracking and focus in an optica

Details Apparatus and method for dynamic tracking and focus in an optica Apparatus and method for dynamic tracking and focus in an optica

1994-01-21

2000-10-31

Tran, Thang V.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369112, G11B 709

Patent

active

061413011

ABSTRACT:
In an optical storage system, an apparatus for focussing a light beam onto a recording medium. A light source generates a light beam which is modulated by a thin-film PLZT modulator array. A beamsplitter is used to direct the modulated light beam to an objective lens which focuses the modulated light beam onto the recording medium. The light reflected back from the recording medium is directed by the beamsplitter to a focus detector which generates an electrical signal corresponding to a degree of focus of the modulated light beam in reference to the recording medium. A focus actuator is placed in close proximity to the modulator, wherein the focus actuator has a mirrored surface for reflecting the light beam to the beamsplitter. By moving the focus actuator in an optical axis according to the electrical signal generated by the focus detector, a high bandwidth servo loop can be closed about the focal position.

REFERENCES:
patent: 4224480 (1980-09-01), Satoh et al.
patent: 4793696 (1988-12-01), Suh
patent: 5191393 (1993-03-01), Higrette et al.
patent: 5202875 (1993-04-01), Rosen et al.
patent: 5283777 (1994-02-01), Tanno et al.

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