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HEAD-UP DISPLAY APPARATUS

  • US 3,709,589 A
  • Filed: 12/28/1970
  • Issued: 01/09/1973
  • Est. Priority Date: 12/28/1970
  • Status: Expired due to Term
First Claim
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1. A head-up display apparatus for a craft, comprising two display-producing means, collimator means having an optical axis, means defining a display position substantially in a focal plane of said collimator means, means mounting a first of said displayproducing means in said display position, a partially-transparent reflector mounted in the image field of the collimator means, said collimator means projecting onto the reflector the display provided at said display position so that the display projected is visible to an observer in the craft viewing a distant scene through the reflector, and display-changing means operable selectively to replace the said first display-producing means at said display position by the second display-producing means, said display-changing means comprising means operable selectively to withdraw said first display-producing means from said display position along a path substantially parallel to said optical axis at said position, and means for moving said second displayproducing means into said display position in place of said first display-producing means.

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