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OPTICAL DISPLAY MEANS FOR AN ALL-WEATHER LANDING SYSTEM OF AN AIRCRAFT

  • US 3,614,314 A
  • Filed: 03/21/1967
  • Issued: 10/19/1971
  • Est. Priority Date: 03/21/1967
  • Status: Expired due to Term
First Claim
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1. An optical display device for use on an aircraft to supply to the eyes of a person an image of a landing runway for the aircraft during low visibility conditions;

  • said optical display device comprising means for supplying a pictorial image of substantial spacial identity to that of a physical array of beacons outlining the landing runway, partially reflecting mirror means carried by the display device and projecting from an underside of the display device at an obtuse angle relative To said underside of the display device toward said person so as to be positioned in an adjacent and underlaying relation to both of the eyes of said person and between the eyes of said person and the landing runway so that there may be viewed through the partially reflecting mirror means such of the beacons outlining the landing runway as may be viewable under prevailing low visibility conditions, other optical elements mounted in the display device, said other optical elements including a collimating optical system cooperating with said supply means and arranged between said image supply means and the partially reflecting mirror means so that the image presented by said supply means may be superimposed by the collimating optical system on so much of the image of said beacons as may be viewable through the partially reflecting mirror means under the prevailing low visibility conditions, a mechanism for supporting the optical display device, mounting means projecting from an interior surface of the aircraft for carrying the supporting mechanism so as to maintain the partially reflecting mirror means in alignment with a boresight of the aircraft, and releasable means for connecting the optical display device to a helmet to be worn by said person for permitting only a limited extent of motion of said person relative to the display device, and the extent of the motion of said person being so limited as to retain the partially reflecting mirror means in the underlaying relation with the eyes of said person and in alignment with the boresight of the aircraft during the extent of the limited motion of said person permitted by said supporting mechanism and connecting means.

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