Patent ID: 6392742
Filing Date: 2002-05-21
Classification: G03F

Abstract:
An illumination system, comprising:a light source; an emission angle preserving optical element for emitting light from said light source, at a certain emission angle; a collecting optical system for collecting the light from said emission angle preserving optical element; a pattern forming optical system having at least a computer generated hologram, for producing, on a predetermined plane, a light pattern of a desired shape having a uniform light intensity distribution, by use of light from said collecting optical system; multiple-beam producing means for producing a plurality of light beams; a zooming optical system for projecting the light intensity distribution on the predetermined plane, onto a light entrance surface of said multiple-beam producing means at a predetermined magnification; and illuminating means for superposedly projecting the plurality of light beams from said multiple-beam producing means, upon a surface to be illuminated.