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Optical systems with compact back focal lengths

  • US 20130182227A1
  • Filed: 07/16/2012
  • Published: 07/18/2013
  • Est. Priority Date: 05/09/2008
  • Status: Active Grant
First Claim
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1. An optical system, comprising:

  • an imaging source operable to output light;

    a relay element operable to receive the light from the imaging source; and

    a projection lens;

    wherein the relay element is configured to form an intermediate image having a focal point proximate to an entry surface of the projection lens, the focal point of the intermediate image and the entry surface of the projection lens defining a back focal length therebetween; and

    wherein the projection lens is operable to project the intermediate image.

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