Patent ID: 6344929
Filing Date: 2002-02-05
Classification: G02B,H04N

Abstract:
An illumination apparatus comprising a light-collecting reflector, a light source placed at a position of a focal point of the reflector, a first lens array for condensing light reflected by the reflector, a second lens array disposed at or near a position of a rear focal point of the first lens array, and an optical system for illuminating a surface to be illuminated, with multiple beams from the second lens array, said illumination apparatus satisfying the following condition:0.7<K1<1.3 where K1=(LarcÃ—flyf1/2fm)/(Lfly2p/2) where Larc: a length of a light-emitting portion of said light source along a direction of the optical axis, flyf1: a focal length of said first lens array, fm: a focal length of said light-collecting reflector, and Lfly2p: a length along a longitudinal direction of an entrance surface of each lens of said second lens array.