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Holographic head-up displays

  • US 4,218,111 A
  • Filed: 07/10/1978
  • Issued: 08/19/1980
  • Est. Priority Date: 07/10/1978
  • Status: Expired due to Term
First Claim
Patent Images

1. In a head-up display system of the type including a source of optical image signal, relay lens means for relaying said optical image signal to a holographic element positioned and used as a combiner lens so that the user may see both said optical image signal projected to said holographic optical element and the external world through said holographic element, optical elements comprising said source of optical image signal (element I), said relay lens means (elements II-VIII), a notch bandpass filter (element IX) and a folding prism (element X), said elements having the following prescription characteristics:

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    space="preserve" listing-type="tabular">______________________________________ ELE- SURF MENT NO. RD TH* INDEX TILT** DEC** ______________________________________ I 51 ∞

    .250 1.517 12.496 0 52 ∞

    3.503 AIR 12.496 .054 II 53 -34.998 1.410 1.785 -9.906 .731 54 -5.687 .084 AIR -9.906 .488 III 55 26.795 .725 1.785 1.943 .246 56 -19.482 .050 AIR -1.943 .222 IV 57 13.723 .656 1.785 -1.943 .220 58 289.330 .050 AIR -1.943 .198 V 59 6.940 .570 1.785 -1.943 .196 60 15.616 .050 AIR -1.943 .177 VI 61 3.355 1.834 1.607 -2.728 .175 62 -8.042 .170 1.728 -1.943 .113 63 1.926 2.625 AIR -1.943 .107 VII 64 5.727 1.056 1.620 -6.147 .478 65 -11.880 .179 AIR -6.147 .365 VIII 66 ∞

    .250 1.517 0 0 67 ∞

    5.344 AIR 0 0 IX 68 ∞

    .437 1.522 -22.316 0 69 ∞

    / / -26.482 -.166 ______________________________________ *Glass thicknesses are measured along the axis of the first surface of th lens;

    air thicknesses are measured along an arbitrary reference line 20. **Surface tilts and decenters are relative to line 20. Decentration applies prior to tilt. Tilt is specified in angular deviation from the normal to line 20. Decentration is specified along the normal to line 20.

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