Patent ID: 6356395
Filing Date: 2002-03-12
Classification: G02B,G11B

Abstract:
A light intensity distribution converting device which is used for at least one of incident light and emerging light being diverging light or converging light, said device comprising:a body including a first curved surface extending transversely of a central axis, a second curved surface extending transversely of the central axis, and an outer circumferential surface extending between said first curved surface and said second curved surface; one of said first and second curved surfaces having a concave surface configuration at approximately a center portion thereof; and the other having a convex surface configuration at approximately a center portion thereof, wherein said body is constructed such that the incident light with a Gaussian light intensity distribution is converted into the emerging light with an approximately uniform light intensity distribution, due to refraction of light caused while the light passed from the first curved surface to the second curved surface, and wherein the arrangement is such that diverging light is converted into parallel light, wherein an exit pupil is larger than an entrance pupil.