Liquid crystal lens element and optical head device
US7388822B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 3, 2006 |
| Grant date | Jun 17, 2008 |
| Priority date | — |
| Expiry date | Aug 3, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/0013
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal lens element having a lens function is provided, which is small sized without having moving part, and which can stably carry out correction of spherical aberration containing a power component corresponding to focal point change of incident light.A liquid crystal lens element which changes a focal length of light transmitted through a liquid crystal 16 according to the magnitude of the voltage applied to the liquid crystal 16 sandwiched between a pair of transparent substrates 11 and 12, which comprises transparent electrodes 13 and 14 provided on the respective transparent substrates 11 and 12 for applying a voltage for the liquid crystal 16, and a concave-convex portion 17 having a saw-tooth-shaped cross-sectional shape having a rotational symmetry about an optical axis and formed on one surface of the transparent electrode 13 with a transparent material, wherein at least concave portions of the concave-convex portion 17 are filled with the liquid crystal 16 so as to change the substantial refractive index of the liquid crystal 16 according to the magnitude of applied voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.