Patent ID: 6061184
Filing Date: 2000-05-09
Classification: G02B

Abstract:
An attachment lens for an annular illumination system which extends along a rotational axis for distributing the intensity of light beams emanating annularly from a light emanating surface of said illumination system onto an object to be illuminated, said attachment lens comprising:a ring-shaped optical element to be arranged concentrically with respect to said annular light beams and said rotational axis in a desired relationship to said light emanating surface of said illumination system, said ring-shaped optical element havinga first rotationally symmetrical zone of a refractive power which increases towards said rotational axis for said annular light beams emanating from said illumination system; anda second zone substantially for light beams which are aligned or parallel to said rotational axis, said second zone being adjacent and concentric to said first zone and substantially free of any refractive power.