Wavefront aberration compensation in an optical data recording a

Details Wavefront aberration compensation in an optical data recording a Wavefront aberration compensation in an optical data recording a

1996-01-25

1998-08-11

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369 4423, G11B 7135, G11B 1110

Patent

active

057937354

ABSTRACT:
A wavefront aberration compensating apparatus for an optical data recording and reproducing apparatus to correct a wavefront aberration of light emitted from a light source and converged onto a data recording medium through an image forming optical system includes a liquid crystal matrix. The matrix has several liquid crystal elements in a matrix arrangement, and is located in an optical path between the light source and the data recording medium. Each liquid crystal element can independently control a phase of light incident thereupon. The compensating apparatus also includes a liquid crystal controller which individually controls the liquid crystal elements to minimize the wavefront aberration of a beam spot converged onto the data recording medium. The invention is also directed to an optical data recording and reproducing apparatus having the wavefront aberration compensating apparatus incorporated therein.

REFERENCES:
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patent: 5120128 (1992-06-01), Ulich et al.
patent: 5157459 (1992-10-01), Oono et al.
patent: 5223970 (1993-06-01), Oono et al.
patent: 5317144 (1994-05-01), Oono et al.
patent: 5416757 (1995-05-01), Luecke et al.
patent: 5497254 (1996-03-01), Amako et al.

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