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Automobile head-up display system with reflective aspheric surface

  • US 4,961,625 A
  • Filed: 09/15/1989
  • Issued: 10/09/1990
  • Est. Priority Date: 09/18/1987
  • Status: Expired due to Fees
First Claim
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1. An optical display system for presenting visual information to an observer, comprising:

  • a vision unit through which the observer can view an outside world scene, the vision unit having a reflective aspheric surface with a curvature characterized by vision unit sag properties;

    information source means for providing source information carried by light propagating along an optical path for reflection by the reflective surface of the vision unit for display to an observer; and

    projection lens means for projecting the source information at a finite projection distance and predetermined size for display to the observer and for compensating for aberrations caused by the reflective aspheric surface of the vision unit so that the light reflected by it is of substantially aberration-free character for viewing by the observer,the projection lens means including first and second lens sections positioned along the optical path between the reflective surface and the information source means, the first lens section including a rotationally nonsymmetric optical element characterized by the vision unit sag properties to compensate for nonsymmetric aberrations introduced by the reflective aspheric surface of the vision unit and the second lens section characterized by optical light directing properties that affect the projection distance and the size of the source information and that compensate for other optical aberrations present in the optical display system, thereby to provide projection lens means in which the second lens section is substantially independent of vision unit sag properties and is compatible with vision units having different sag properties.

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