Exposure apparatus of an optical disk master, method of...

Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system

Reexamination Certificate

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C369S112020, C369S112280

Reexamination Certificate

active

10975605

ABSTRACT:
Apparatus and method for exposing an optical disk master having a laser source, a deflector for deflecting a recording laser beam based on the laser beam of the laser source and an objective lens for focusing the recording laser beam on an optical disk master, including a liquid crystal plate provided between the laser source and the deflector, a parallel flat plate provided between the deflector and the objective lens, a photodetector that detects reflected light from the parallel flat plate, and an adjusting device for adjusting a voltage applied to the liquid crystal plate based on information on wavefront fluctuation of the recording laser beam detected by the photodetector.

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Chinese Office Action for Patent Application No. 021412472, dated Nov. 5, 2004 (with English translation).

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