Wavefront aberration compensation in an optical data recording and reproducing apparatus with crystal liquid matrix
US5793735A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 25, 1996 |
| Grant date | Aug 11, 1998 |
| Priority date | — |
| Expiry date | Jan 25, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B11/10543
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.