Optical element, optical head using the optical element, and optical recording and reproducing apparatus using the optical element
US6480454B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 13, 1999 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Dec 13, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention presents an optical element that has a good correcting effect with regard to aberrations and is easy to manufacture, as well as an optical head and an optical recording and reproducing apparatus using the same. The optical element includes a first substrate, a second substrate arranged substantially in parallel to the first substrate, a voltage applying electrode arranged between the first substrate and a liquid crystal, an opposing electrode arranged substantially in parallel to the voltage applying electrode and opposing the voltage applying electrode, and a liquid crystal arranged between the first substrate and the second substrate. By changing the voltage between the voltage applying electrode and the opposing electrode, the phase of the light incident on the liquid crystal can be changed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.