Patent ID: 6761457
Filing Date: 2004-07-13
Classification: G02B,G03B,H04N

Abstract:
An optical illumination device of illuminating an illuminated region inclined with respect to an optical axis, comprising:a light source, a front optical illumination system of condensing light emitted from said light source, a light transmitting element inputted with said condensed light beam, for forming a first light-emitting surface; and a relay optical system for forming a second light-emitting surface on said illuminated region using light passing through said first light-emitting surface, wherein said relay optical system substantially conjugates said first light-emitting surface and said second light-emitting surface to each other, said light-emitting surfaces being inclined with respect to an optical axis of said relay optical system, and said light transmitting element corrects a traveling direction of said incident light beams to form said first light-emitting surface such that an outgoing light beam is effectively incident on said relay optical system, and said light transmitting element forms said first light-emitting surface such that said first light-emitting surface has a brightness gradient in a direction in which brightness gradient appearing in said relay optical system is canceled.