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Illuminating optical device

  • US 4,918,583 A
  • Filed: 04/19/1989
  • Issued: 04/17/1990
  • Est. Priority Date: 04/25/1988
  • Status: Expired due to Term
First Claim
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1. An illuminating optical device having an optical integrator capable of receiving a light flux from a light source and substantially forming a plane light source comprising a plurality of light source images and uniformly illuminating an object, including:

  • a square-pillar-like internal reflection type integrator having a plurality of reflecting surfaces capable of reflecting the light flux from said light source and forming a plurality of virtual images of said light source on a plane near the entrance surface thereof;

    a fly-eye type integrator comprising a plurality of lens elements receiving the light flux from said light source and capable of forming a plurality of light source images on a plane, said lens elements being juxtaposed in proximity to one another; and

    relay lens means provided between said two integrators so that the exit surface of one of said two integrators which is adjacent to the light source and the entrance surface of the other integrator which is adjacent to the object are substantially conjugate with each other.

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