Headup display

Details Headup display Headup display

1996-06-20

1998-05-05

Nelms, David C.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359728, 359730, 359858, G02B 2714

Patent

active

057483779

ABSTRACT:
A headup display including a light emission-type display source, a concave mirror having an spherical reflecting surface and located so as to reflect light emitted from the display source, and a reflection-type hologram located so as to reflect the light reflected on the concave mirror toward an observer in a mobile unit. The concave mirror is configured so that its lateral focal length contributing to lateral enlargement of a displayed image is shorter than its longitudinal focal length contributing to longitudinal enlargement of the displayed image. The reflection-type hologram is configured so that its longitudinal focal length contributing to longitudinal enlargement of the displayed image is shorter than its lateral focal length contributing to lateral enlargement of the displayed image.

REFERENCES:
patent: 5363220 (1994-11-01), Kuwayama et al.
patent: 5506595 (1996-04-01), Fukano et al.
patent: 5594588 (1997-01-01), Togino

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