Patent ID: 6313892
Filing Date: 2001-11-06
Classification: G02F

Abstract:
An apparatus for providing a substantially uniform distribution of light across a two-dimensional region, said apparatus comprising:an optical cavity formed by a member comprising first and second end portions and first and second side portions, the first end portion adapted for mounting a light source for illuminating the optical cavity, said member having a bottom portion which forms a central bottom surface of the optical cavity, said optical cavity having an aperture for outputting light from the cavity to illuminate said two-dimensional region, said aperture having an area, the ratio of said area of said aperture to the sum of (i) the area of said aperture and (ii) the combined area of all remaining cavity surfaces being at least 0.05, said cavity having surfaces which slope upwardly and outwardly from said central bottom surface at said second end portion, and at said first side portion, and at said second side portion to reduce said sum and increase said ratio.