Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1989-05-18
1991-10-01
Ng, Jin F.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340980, 353 13, 353 14, 359 13, 359630, G09G 302
Patent
active
050537555
ABSTRACT:
A head-up display having an image source for producing imaging illumination, an optical combiner for partially reflecting the imaging illumination to produce a virtual image of the image source that is viewable by the operator of the vehicle, and a polarizer which can be controllably interposed between the image source and the optical combiner for nighttime use. The polarizer tends to block the illumination that otherwise would produce objectionable ghost images.
REFERENCES:
patent: 2641159 (1953-06-01), Mihalakis
patent: 2750833 (1956-06-01), Gross
patent: 3230819 (1966-01-01), Noxon
patent: 3915548 (1975-10-01), Opittek et al.
patent: 4808978 (1989-02-01), Vernay
patent: 4832427 (1989-05-01), Nanba et al.
patent: 4973139 (1990-11-01), Weinhrauch et al.
Chern Mao-Jin
Hegg Ronald G.
Smith Ronald T.
Alkov Leonard A.
Denson-Low Wanda K.
Hughes Aircraft Company
Ng Jin F.
Popovici Dov
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