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Device for observation through a wall in two opposite directions

  • US 4,613,216 A
  • Filed: 03/20/1985
  • Issued: 09/23/1986
  • Est. Priority Date: 03/27/1984
  • Status: Expired due to Term
First Claim
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1. An optical device for observation through a wall, comprising:

  • a main parallelogram-shaped optical unit having two pairs of parallel faces, a first objective lens disposed adjacent an upper end of said main unit, and a first eyepiece lens disposed adjacent an opposite end thereof and diagonally opposite said objective lens, the faces of the main optical unit being so angled relative to one another that a light beam entering through the first objective lens will be reflected by two of said faces to exit through said first eyepiece lens;

    an upper optical unit disposed above the upper end of said main optical unit and having a second objective lens and at least one reflective face for reflecting a light beam entering through said second objective lens into said main optical unit, said light beam entering through said second objective lens being reflected a total of an odd number of times by said at least one reflective face of said upper optical unit and at least one face of said main optical unit so as to exit through an eyepiece selected from the group consisting of said first eyepiece and a second eyepiece disposed adjacent to said first eyepiece.

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