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Optical weapon sight having controlled universally moveable mirror

  • US 3,892,474 A
  • Filed: 11/08/1973
  • Issued: 07/01/1975
  • Est. Priority Date: 11/13/1972
  • Status: Expired due to Term
First Claim
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1. An optical sight device for weapon aiming, comprising a fixed frame that carries a viewing screen, means fixed on the frame for generating a sighting symbol image which is to be visible on the screen and to be used as an aiming reference, a mirror which reflects the sighting symbol image onto the screen and which is constrained to universal tilting about a pair of perpendicular coplanar tilt axes, and demand signal means for producing outputs signifying the magnitude and direction of displacement of the mirror about each of said axes that will so orient the mirror that the sighting symbol is positioned on the screen in accordance with conditions that affect aiming, said optical sight being characterized by:

  • A. two pairs of rEversible linear motors, one pair for tilting the mirror about each of said tilt axes, 1. each of said motors being connected between the frame and the mirror to react between them, 2. the two motors of each pair being located a. substantial and equal distances to opposite sides of the intersection of the tilt axes, and b. on one of said axes;

    B. position transducer means for producing an output that corresponds to the angular orientation of the mirror about each of said tilt axes, said position transducer means comprising 1. an exciter element spaced to one side of the plane containing the tilt axes and located on a perpendicular to said plane that extends through the intersection of said axes, 2. two pairs of fixed detector elements, one pair for each of said tilt axes, the two detector elements of each pair thereof being spaced equal distances to opposite sides of the plane that contains said perpendicular and their tilt axis and being located on the plane that contains said perpendicular and the other tilt axis, and 3. an element at said one side of the first mentioned plane, constrained to move in unison with the mirror and having portions in opposing relationship to the exciter element and normally in partial opposing relationship to all of said detector elements to vary an electrical characteristic of a circuit comprising each pair of detector elements in accordance with the orientation of the mirror; and

    C. circuit means connected with said demand signal means and connected in feedback relationship with said position transducer means for producing control outputs for the linear motors that correspond in magnitude and sign with any departure of the mirror from an orientation signified by the output of the demand signal means and for feeding said control outputs to the linear motors to cause them to maintain the mirror in the last mentioned orientation.

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