Patent ID: 6607276
Filing Date: 2003-08-19
Classification: G02B,H04N

Abstract:
An illuminating optical system comprising:a light source device that emits a substantially parallel light beam; a first lens array having a plurality of first small lenses that divides said light beam into a plurality of sub light beams; and a superimposing lens that superimposes and emits said plurality of sub light beams emitted from the first lens array onto a surface to be illuminated, a size of each of said first small lenses disposed on an outer periphery of said first lens array being set to be smaller than a size of each of said first small lenses disposed on a center of said first lens array so that light application areas formed on a surface to be illuminated by said plurality of sub light beams emitted from said plurality of first small lenses have substantially a same size within a predetermined error range.