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HEAD-UP DISPLAYS

  • US 3,666,887 A
  • Filed: 06/24/1970
  • Issued: 05/30/1972
  • Est. Priority Date: 06/29/1968
  • Status: Expired due to Term
First Claim
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1. A head-up display system for displaying information to an observer in a vehicle having a predetermined field of view from the vehicle comprising a source of light information signals mounted on the vehicle, means mounted on the observer for superimposing an image of said signals on the field of view of the observer by directing light carrying the signals to the observer, monitoring means mounted on the vehicle for detecting angular displacement of the superimposing means with respect to a predetermined axis and for producing a control signal indicative of such angular displacement, and means responsive to such control signal for adjusting the orientation of the light information signals so that the orientation of the signals in the image viewed by the observer remains substantially constant with respect to said predetermined axis, wherein the monitoring means for detecting angular displacement of the superimposing means for producing a control signal indicative thereof comprise means to direct a beam of radiation onto the superimposing means, means to receive radiation reflected from said beam by the superimposing means, and means to emit a control signal responsively to displacement of the reflected radiation.

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