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Telescopic sight for day/night viewing

  • US 5,084,780 A
  • Filed: 01/18/1991
  • Issued: 01/28/1992
  • Est. Priority Date: 09/12/1989
  • Status: Expired due to Term
First Claim
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1. A telescopic sight for day and night operations comprising:

  • a first optical assembly for directing an incoming image in the near-infrared spectrum for night operation of the sight along a first optical path;

    a second optical assembly for directing an incoming image in the visible spectrum for day operation of the sight along a second optical path, wherein said second optical assembly includes a prism for inverting and reverting the incoming image on the second optical path;

    an image intensifier assembly located in the first optical path for night viewing of the image, said assembly having an input surface positioned adjacent said first optical assembly and an opposed output surface;

    optical means for day viewing of the image located in the second optical path which is parallel to the first optical path, said optical means having an entrance surface and an exit surface;

    p1 an ocular lens assembly located on the second optical path for transmitting light received at an input surface thereof from said image intensifier assembly and from said optical means along a common path to a viewer; and

    transmitting means located in a third optical path for transmitting the light from a location on the first optical path which is adjacent the output surface of said image intensifier assembly to a location on the second optical path which is adjacent the exit surface of said optical means, wherein said transmitting means includes a beamsplitter/combiner positioned in the second optical axis and having a front surface adjacent said exit surface of said optical means and a combining surface, said combining surface being positioned at a predetermined angle with respect to the second optical path for receiving the light transmitted from the output surface of said image intensifier assembly and the light transmitted from said exit surface of said optical means and directing the light along the second optical path to said ocular lens assembly.

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