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Two-source illumination system

  • US 5,386,250 A
  • Filed: 08/09/1993
  • Issued: 01/31/1995
  • Est. Priority Date: 08/09/1993
  • Status: Expired due to Fees
First Claim
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1. A two-source illumination system comprising:

  • (a) a DMD (deformable micromirror device) having a planar array reflective deflection elements, and an axis normal to the plane of the array, the elements being deflectable to a first position in response to a first drive voltage, and being deflectable to a second position in response to a second drive voltage;

    (b) voltage drive means for causing the elements to cycle periodically between the first and second positions;

    (c) a first illumination source in a first off-axis position for illuminating the DMD when the elements are in the first position;

    (d) a second illumination source in a second off-axis position for illuminating the DMD when the elements are in the second position; and

    ;

    (e) means for alternately illuminating the sources synchronously with the drive means so that the first source is on when the elements are in the first position and the second source is on when the elements are in the second position,whereby illumination reflected from the DMD is a combination of illumination from both sources.

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