Optical head device and optical information recording or...

Details Optical head device and optical information recording or... Optical head device and optical information recording or...

2006-08-01

2006-08-01

Wellington, Andrea (Department: 2652)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S044320

Reexamination Certificate

active

07085218

ABSTRACT:
In an optical head device and an optical information recording/reproducing device using the optical head device, by driving a liquid crystal panel4a, the liquid crystal panel4aproduces wave aberration for light on a going path and light on a returning path likewise. Accordingly, when the substrate-thickness deviation or tilt of the disc7is corrected, the wave aberration due to the substrate-thickness deviation or tilt of the disc7and the wave aberration produced by the liquid crystal panel4aare canceled by each other for both of the light on the going path and the light on the returning path, so that no wave aberration remains for the light on the returning path and the phase distribution is not varied.

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S. Ohtaki et al., “The Applications of a Liquid Crystal Panel for the 15 Gbyte Optical Disk Systems”, Jpn. J. Appl. Phys., vol. 38, No. 3B, Part 1, (Mar. 1999), pp. 1744-1749.

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