Surface light source device
US8167474B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 16, 2011 |
| Grant date | May 1, 2012 |
| Priority date | — |
| Expiry date | Jun 16, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133615
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A light guide plate is formed of a light introducing part positioned to face a point light source for confining light and a light guide plate body having a thickness smaller than the thickness of an end of the light introducing part on a point light source side and causing the confined light to be output from a light exit surface to outside. The light introducing part has an inclined surface, and a directivity conversion pattern formed on the inclined surface. The directivity conversion pattern is configured by arranging V grooves in parallel to each other, each having a vertical angle of 120°, and each extends in a direction approximately perpendicular to a light incidence end face of the light guide plate. The length of the inclined surface in a inclination direction where part of light incident to the light introducing part enters the inclined surface at least twice.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.