Illumination lens for LED backlights
US9255695B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 22, 2013 |
| Grant date | Feb 9, 2016 |
| Priority date | — |
| Expiry date | Sep 15, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133607
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Exemplary embodiments of the present invention relate to an illumination lens disposed over a light-emitting diode (LED). The illumination lens includes an internal surface surrounding the LED and configured to intercept light emitted by the LED, wherein the internal surface comprises an arch-shaped non-rotationally symmetric, elongated horizontal cross-section. The illumination lens also includes an external surface comprising a central cusp, the external surface extending laterally with non-axially-symmetrical profiles in different horizontal directions, the non-axially-symmetric profiles being elliptical with respect to a tilted major axis of the illumination lens, wherein the light-emitting device is configured to produce an elongated illumination pattern.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.