Laser lighting device
US9134537B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 3, 2012 |
| Grant date | Sep 15, 2015 |
| Priority date | — |
| Expiry date | May 27, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2202/20
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In a laser lighting device, a fly's eye lens and a condenser lens are disposed in an optical path of pulsed laser light emitted from a light source, and an electro-optical crystal element for continuously changing the deflection direction of the pulsed laser light with respect to the incident light and allowing the deflected light to pass therethrough is disposed in a position between the light source and the fly's eye lens or between the fly's eye lens and the condenser lens. The electro-optical crystal element is formed, for example, of a pair of electrodes and an optical crystal material disposed between the electrodes, and a voltage is applied between the electrodes to produce an electric field that changes the refractive index of the electro-optical crystal element. As a result, non-uniform illumination due to interference fringes produced by light having passed through the fly's eye lens can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.