Optical pickup with aberration correcting panel including a liqu

Details Optical pickup with aberration correcting panel including a liqu Optical pickup with aberration correcting panel including a liqu

1996-08-14

1999-08-10

Young, W. R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 58, 369112, G11B 700

Patent

active

059369230

ABSTRACT:
An optical pickup which is designed to correct coma aberration and spherical aberration as well as aberration caused by the relative positional deviation of an objective lens to an aberration correcting liquid crystal panel by using this liquid crystal panel and which is thus compatible to both DVDs and CDs. In the optical pickup having at least a laser light source and an objective lens, an aberration correcting liquid crystal panel is arranged on the optical axis of a laser beam and a transparent electrode of this liquid crystal panel is divided into segments in a predetermined pattern like the cross pattern of a chessboard, and voltages to be applied to the individual segments are variably controlled by a liquid crystal panel controller to alter the refractive index of each segment, thus correcting aberration.

REFERENCES:
patent: 5281797 (1994-01-01), Tatsuno et al.
patent: 5416757 (1995-05-01), Luecke et al.
patent: 5661712 (1997-08-01), Chiba
patent: 5793735 (1998-08-01), Oono

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