Optical element, optical head and optical recording reproducing apparatus
US6532202B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 2000 |
| Grant date | Mar 11, 2003 |
| Priority date | — |
| Expiry date | Aug 18, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical element has a phase change layer for changing the phase of light passing therethrough; a plurality of aberration correcting electrodes, arranged on one side of said phase change layer, for correcting optical aberrations, each of said aberration correcting electrodes being split into a plurality of regions; an insulating film interposed between said aberration correcting electrodes; and a specific electrode arranged on the other side of said phase change layer, and wherein: said aberration correcting electrodes, at least other than the outermost aberration correcting electrode as viewed from said phase change layer, have openings formed in prescribed positions, and each of said aberration correcting electrodes, other than the innermost aberration correcting electrode, faces said phase change layer through said openings formed in other aberration correcting electrodes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.