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Three prism color separator

  • US 5,644,432 A
  • Filed: 01/17/1995
  • Issued: 07/01/1997
  • Est. Priority Date: 01/17/1995
  • Status: Expired due to Fees
First Claim
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1. A projection display for projecting a color image in which first, second and third different color component images from first, second and third different reflective light valves are projected onto a display, in which light from a light source containing first, second and third color components passes through an optical beam splitter for directing the beam of light in first, second and third different directions onto first, second and third reflective light valves which reflect the color components back into said optical beam splitter, which combines the reflected color components into one beam for projection of a color image onto the display, wherein said optical beam splitter comprises first, second and third prisms forming a color splitting prism assembly in which the first, second and third prisms are assembled with no air gaps in each of the light paths corresponding to each of the color components between where each of the color components enters said color splitting prism assembly and where each of the color components exits said color splitting prism assembly, and further wherein the first, second and third prisms are dissimilar prisms, with first, second and third optical paths, a first optical path without reflections, a second optical path with one reflection, and a third optical path with two reflections.

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