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Display system having coma-control plate in relay lens

  • US 4,826,287 A
  • Filed: 01/20/1987
  • Issued: 05/02/1989
  • Est. Priority Date: 01/20/1987
  • Status: Expired due to Term
First Claim
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1. A display system including a relay lens and a combiner, and wherein imaging rays propagating through the relay lens are reflected from a curved surface of the combiner, the relay lens comprising:

  • a first lens group having at least one optical element and a second lens group having at least one optical element, each of said lens groups being disposed along a direction of propagation of rays of radiation carrying image data to be presented as collimated rays at a viewing site by said system, said rays of radiation propagating along a path comprising a first leg and a second leg wherein said first leg extends through said relay lens, and wherein radiation propagates along said first leg to reflect off said curved surface of said combiner via said second leg to reach said viewing site, there being a reimaging location on said first leg alongside an element of said relay lens for reimaging a pupil of collimated rays situate on said second leg at said viewing site; and

    a coma-control plate disposed on said first leg at said reimaging location for removing aberration introduced by said curved surface of said combiner, said plate having first and second opposed surfaces, at least one of said opposed surfaces being configured with undulations described mathematically by a power series in two orthogonal dimensions.

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