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Head-up display

  • US 4,977,401 A
  • Filed: 09/07/1989
  • Issued: 12/11/1990
  • Est. Priority Date: 09/07/1988
  • Status: Expired due to Term
First Claim
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1. A head-up-display for indicating the attitude and flight-path angle vertically, the attitude in roll and the heading attitude of an air vehicle, the vehicle having means (5,6) for determining said attitudes and flight-path angle and for emitting corresponding first signals, the head-up-display comprising a screen (10) and means (7,8) for translating said signals to a corresponding display, which is projected together with at least one symbol (13) of a velocity vector of the vehicle, and a symbol (14) of the x-axis of the vehicle, on the screen, said screen comprising a transparent but reflecting plate for the indicator display and said symbols, characterized in that the head-up-display is arranged to present the display (12) as a depiction of at least a portion of the inside of a space-stable sphere with its center in said vehicle, the display depicting at least portions of latitude circles, (15, 16, 19, 20), the nadir of the circles increasing the further away a circle is from the zenith or nadir of the sphere, and meridian markings (18) adjacent said circles.

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