| 摘要 |
Apparatus for projecting an elongated light bar representing an artificial horizon on an interior surface of an aircraft cockpit in front of a pilot of the aircraft with respect to a reference datum line on the interior surface of the cockpit. A vertical reference means, located in the cockpit or remotely therefrom maintains a vertical reference axis for all attitudes of the aircraft. A light beam source, which may be a laser beam, is aligned with a movable optical system having mirrors or lenses to convert the light beam to a plane of light. A mechanical linkage or a servomotor coupled between the vertical reference means and the optical system controls the optical system, so that the datum line appears stationary and the light bar seems to turn angularly and move vertically when the aircraft rolls and pitches.
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