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US 4,218,111 AGranted
Holographic head-up displays
AssigneeHughes Aircraft Company
InventorsRoger J. Withrington, Lacy G. Cook, Helene H. Jones
Life of this patent
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AssigneeHughes Aircraft Company
InventorsRoger J. Withrington, Lacy G. Cook, Helene H. Jones
Estimating the term…
There is disclosed an integrated optical design of head-up displays suitable for use in aircraft cockpits and the like. The display system is comprised of a holographic optical element used as the combiner for presenting a direct view of the exterior on which are superimposed image signals generated by a source device such as a cathode ray tube and transmitted to the combiner through an optical system including a relay lens containing tilted and decentered optical elements to compensate for the aberration present in the holographic optical element. There are further disclosed four relay lens design forms particularly suited for use in the design of such holographic head-up displays. The disclosure includes integrated designs in which (a) the holographic element may or may not be constructed with aberrated wavefront and (b) a beam splitter is incorporated for insertion of a stand-by sight, possibly also being tilted for the correction of aberrations.
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:
Dependencies are inferred from the claim text.