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Mirror converging-type illumination optical system

  • US 4,637,691 A
  • Filed: 02/02/1984
  • Issued: 01/20/1987
  • Est. Priority Date: 02/07/1983
  • Status: Expired due to Term
First Claim
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1. An illumination optical system for supplying substantially uniform illumination light of a high efficiency, comprising:

  • a light source;

    light-ray converting means for converting light rays from said light source into parallel light rays, said light-ray converting means having a concave reflecting surface which has an optical axis; and

    a refraction member arranged in a path of the parallel light rays, so that said refraction member shifts the incident parallel light rays which are farthest from the optical axis to positions substantially coinciding with the optical axis, and shifts the incident parallel light rays which are nearest to the optical axis to positions substantially farthest from the optical axis, said refraction member having a conical input surface having a convex surface facing toward an incident light ray side and a conical output surface having a convex surface facing toward an exit light ray side, vertices of said conical input and output surfaces being located on the optical axis.

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