Patent ID: 6457832
Filing Date: 2002-10-01
Classification: G02F,G03B

Abstract:
An illumination apparatus for illuminating an area to be illuminated, of a rectangular shape with light from a light source via a first lens array, a second lens array, and a condensing optical system arranged in the stated order from the side of the light source, said illumination apparatus satisfying the following conditions:Dfx>(Dpx+&dgr;x)Ã—ff2/fr Dfy>(Dpy+&dgr;y)Ã—ff2/fr where Dpx is a length along a longitudinal direction of said area to be illuminated, Dpy is a length along a transverse direction thereof, ff2 is a focal length of individual lenses forming the second lens array, fr is a focal length of said optical system, &dgr;x is a width of transverse aberration in said longitudinal direction against an object at infinity, caused by said optical system, &dgr;y is a width of transverse aberration in said transverse direction, caused by said optical system, Dfx is a length along a longitudinal direction of individual lenses of the first lens array, and Dfy is a length along a transverse direction of the lenses of the first lens array.