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Projector system with hollow light pipe optics

  • US 5,902,033 A
  • Filed: 08/07/1998
  • Issued: 05/11/1999
  • Est. Priority Date: 02/18/1997
  • Status: Expired due to Fees
First Claim
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1. A light engine for an optical projector system comprising:

  • lamp means to generate light;

    collector means to collect and direct the generated light; and

    a light pipe having an entrance pupil, a central section, an exit pupil along a straight optical axis, and reflecting walls;

    characterized in thatthe light pipe is hollow, and with internal walls, the light pipe is double tapered with the exit pupil being rectangular and the area of the entrance pupil being at least 50% larger than a cross-sectional area perpendicular to the optical axis of the center section, and a cold mirror coating is coated on the internal walls.

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