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Head-up display device of holographic type

  • US 5,640,275 A
  • Filed: 02/22/1988
  • Issued: 06/17/1997
  • Est. Priority Date: 02/27/1987
  • Status: Expired due to Fees
First Claim
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1. A head-up display device comprising a generator of a luminous image to be displayed, a holographic optical element, a relay optics that produces an intermediate image of said luminous image in the focal plane of said holographic optical element, which element plays the role of a combining optics so that the observer sees both said luminous image collimated and reflected on this element and the outside world through this element, and a folding element with a reflecting surface disposed between said relay optics and said holographic optical element, said relay optics being made up of six lens elements numbered in their order of interposition in the optical path from said folding element to said generator of luminous image, these lens elements having the technical characteristics indicated in the following tables where the radius of curvature, the thickness and the coordinates of the top are expressed in millimiters and the angles in degrees, the top being the intersection of the axis of the optical path and the side of the element oriented towards said folding element, the indicated angles being those of tilt of said lens element about two perpendicular axes forming a reference trihedron with a third direction corresponding to the normal sighting direction of the observer:

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    space="preserve" listing-type="tabular">______________________________________ Position of the lenses and window Element Top/X Top/Y Top/Z Angle θ

    Angle φ

    ______________________________________ 31 67.2052 -112.3536 0 -18.65938 0 32 93 -185.4922 0 9.008556 0 33-34 160.5 -151.5743 0 -4.583662 0 35 201.5 -147.6652 0 -3.415327 0 36 221 -180 0 5.825859 0 37 318.7698 -175.6418 0 -39.82057 0 ______________________________________ Radii of curvature and thicknesses Element Radius Thickness ______________________________________ 31 99999 24 -179.16 32 161.53 30 4720 33 -55.08 5.5 84 34 -85.77 37.5 35 492.2894 18 -159.23 36 101.12 30 292.6 37 99999 5 99999 ______________________________________

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