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Dual-path optical system

  • US 5,469,293 A
  • Filed: 09/09/1993
  • Issued: 11/21/1995
  • Est. Priority Date: 09/09/1993
  • Status: Expired due to Fees
First Claim
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1. A dual-path, pseudoscopic optical system comprising:

  • a pair of objectives arranged along separate optical axes that are spaced apart from one another by a predetermined distance;

    a ninety-degree roof mirror system comprising upper and lower plane mirrors intersecting one another along a line substantially parallel to both optical axes of said objectives;

    a pair of crossed plane mirrors arranged one above the other in planes that intersect one another approximately at a right angle, one of said crossed plane mirrors being positioned to intersect said optical axes of said objectives to fold them so that light rays travel to said upper mirror of said roof mirror system from which they are reflected to travel downwardly to said lower mirror of said roof mirror system after which they are folded again by said lower mirror of said roof mirror system to travel along a direction opposite to the one in which they entered said roof mirror system and offset with respect thereto, the other of said crossed plane mirrors being arranged to intercept rays reflected from said lower mirror of said plane mirror roof system and direct them rearwardly along two separate optical axes that are parallel to said optical axes of said objectives, vertically offset with respect thereto, but spaced apart by said predetermined distance by which said objective optical axes are spaced apart, said objectives, said roof mirror system, and said plane crossed mirrors being arranged to form pseudoscopic real images of an object space along said rearwardly extending optical axes; and

    a pair of eyepieces arranged, respectively, along said rearwardly extending optical axes for observing said pseudoscopic images.

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