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METHOD FOR DESIGNING OFF-AXIS THREE-MIRROR IMAGING SYSTEM WITH FREEFORM SURFACES

  • US 20160170191A1
  • Filed: 07/30/2015
  • Published: 06/16/2016
  • Est. Priority Date: 12/11/2014
  • Status: Active Grant
First Claim
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1. A method for designing an off-axis three-mirror imaging system with freeform surfaces, the method comprising:

  • establishing an initial system, the initial system includes a primary mirror initial structure, a secondary mirror initial structure, and a tertiary mirror initial structure;

    keeping the primary mirror initial structure and the secondary mirror initial structure unchanged;

    selecting a plurality of first feature rays, the plurality of first feature rays are forward rays tracked from an object space to an image detector; and

    calculating a plurality of first feature data points Pi (i=1, 2 . . . K) point by point based on an object-image relationship of the plurality of first feature rays, to obtain a tertiary mirror by surface fitting the plurality of first feature data points Pi (i=1, 2 . . . K); and

    keeping the secondary mirror initial structure and the tertiary mirror unchanged;

    selecting a plurality of fields and a plurality of second feature rays, the plurality of second feature rays are reverse rays tracked from the image detector to the object space; and

    calculating a plurality of second feature data points P′

    i (i=1, 2 . . . K) point by point based on an object-image relationship of the plurality of second feature rays, to obtain a primary mirror by surface fitting the plurality of second feature data points.

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