Head up display system
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United States of America Patent
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-
Jun 2, 1987
Grant Date -
N/A
app pub date -
Feb 3, 1984
filing date -
Feb 3, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A head up display includes a simplified holographic combiner which has a low surface spatial frequency for avoiding flare. Symbology generated by a cathode-ray-tube is focused by relay optics and then reflected by a holographic optical element toward the holographic combiner. The last mentioned holographic optical element is provided with optical power in part compensating for distortions attributable to the large off-axis angle at which the holographic combiner is operated.
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