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Real image viewfinder requiring no field lens

  • US 5,241,337 A
  • Filed: 05/13/1991
  • Issued: 08/31/1993
  • Est. Priority Date: 05/13/1991
  • Status: Expired due to Fees
First Claim
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1. In an optical finder system without presence of a field lens having a field of view in object space of a half angle of at least 2°

  • as defined by the principal rays the finder system including a reflective optical assembly including, a plurality of reflective surfaces;

    first and second optical units for forming a real image at an intermediate image plane in the reflective optical assembly;

    an eyelens to facilitate viewing of an object; and

    wherein the improvement comprises;

    said first and said second optical units cooperate to make said principal rays substantially parallel to an optical axis at the intermediate image plane.

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