1988-02-05
1989-05-23
Corbin, John K.
350 37, 350 377, 350174, G02B 532, G02B 2714, G03H 128
Patent
active
048324272
ABSTRACT:
A display source emits light. A first hologram receives the light from the display source and diffracts the received light. The light from the display source is applied to the first hologram at an incident angle A1 and moves from the first hologram at an outgoing angle B1. A second hologram receives the light from the first hologram and diffractively reflects the received light. The light diffractively reflected by the second hologram forms an image of the display source in viewer's field of view. The light from the first hologram is applied to the second hologram at an incident angle A2 and moves from the second hologram at an outgoing angle B2. The first and second holograms are nonparallel to remove a ghost image of the display source which would result from at least one of surface reflections at the first and second holograms. The first hologram has an angle .theta. relative to the second hologram. The angles A1, B1, A2, B2, and .theta. are in a fixed relationship to remove chromatic aberration which would result from the nonparallel arrangement of the first and second holograms.
REFERENCES:
patent: 4261647 (1981-04-01), Ellis
patent: 4407564 (1983-10-01), Ellis
patent: 4560233 (1985-12-01), Banbury
patent: 4613200 (1986-09-01), Hartmann
patent: 4655540 (1987-04-01), Wood et al.
patent: 4763990 (1988-08-01), Wood
Goto Tukasa
Koike Satoshi
Mizuno Toru
Nanba Sinzi
Corbin John K.
Edmondson David J.
Nippondenso Co. Ltd.
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