Liquid crystal lens element optical head device
US7738344B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 2007 |
| Grant date | Jun 15, 2010 |
| Priority date | — |
| Expiry date | Sep 7, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B2007/13727
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A liquid crystal lens element is provided, which does not produce change of transmission wavefront regardless of polarization state of incident light when it is off-state at a time of no voltage application, and which exhibits concave lens function for extraordinarily polarized incident light when it is on-state at a time of voltage application.In a liquid crystal lens element 10 comprising a pair of transparent substrates 11 and 12 and a liquid crystal layer 16 sandwiched between the transparent substrates, which is configured to change convergent point of light transmitted through the element according to the magnitude of voltage applied to the liquid crystal layer 16, the liquid crystal lens element 10 further comprises a Fresnel lens 17 having a concave-convex-shaped cross section formed on the transparent substrate 11, a first transparent electrode 13 formed on a flat surface of the transparent substrate 11 on which the Fresnel lens 17 is formed, and a second transparent electrode 14 formed on a flat surface of the other transparent substrate 12.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.