Patent ID: 6332688
Filing Date: 2001-12-25
Classification: G02B,G02F,H04N

Abstract:
A mirror assembly for collecting light from a source and directing the light onto a target comprising:a truncated ellipsoidal mirror, having an reflective concave surface, a near and a far focal point and a circular edge which results from the truncation;a first annular paraboloid mirror, having a focus point, a reflective concave surface and having respective circular edges of larger and a smaller circular diameter, the smaller diameter circular edge of said annular paraboloid mirror joined to the circular edge of said ellipsoidal mirror; and,a second annular paraboloid mirror, having a focus point, a reflective concave surface and a larger and a smaller diameter circular edge, the larger circular edge of said second annular paraboloid mirror joined to the larger circular edge of said first annular paraboloid mirror, so that the reflective surface of said second paraboloid mirror faces the reflective surface of said ellipsoidal mirror;wherein the near focal point of said ellipsoidal mirror and the respective focus points of said first and second annular paraboloid mirrors are essentially coincident and are essentially coincident with the geometric center of the light source.