Headup display
First Claim
1. A headup display comprising:
- a light emission-type display source;
a first concave mirror located so as to reflect light emitted from said display source, said first concave mirror having an aspherical reflecting surface, said first concave mirror having a lateral focal length contributing to lateral enlargement of a displayed image and a longitudinal focal length contributing to longitudinal enlargement of said displayed image, said lateral focal length being shorter than said longitudinal focal length; and
a combiner located so as to reflect the light reflected on said first concave mirror toward an observer in a mobile unit, said combiner having a longitudinal focal length contributing to longitudinal enlargement of said displayed image and a lateral focal length contributing to lateral enlargement of said displayed image, said longitudinal focal length of said combiner being shorter than said lateral focal length of said combiner.
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Accused Products
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.
29 Citations
11 Claims
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1. A headup display comprising:
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a light emission-type display source; a first concave mirror located so as to reflect light emitted from said display source, said first concave mirror having an aspherical reflecting surface, said first concave mirror having a lateral focal length contributing to lateral enlargement of a displayed image and a longitudinal focal length contributing to longitudinal enlargement of said displayed image, said lateral focal length being shorter than said longitudinal focal length; and a combiner located so as to reflect the light reflected on said first concave mirror toward an observer in a mobile unit, said combiner having a longitudinal focal length contributing to longitudinal enlargement of said displayed image and a lateral focal length contributing to lateral enlargement of said displayed image, said longitudinal focal length of said combiner being shorter than said lateral focal length of said combiner. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An image projecting device comprising:
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a light emission-type display source;
.light condensing means located so as to condense light emitted from said display source, said light condensing means having a lateral focal length contributing to lateral enlargement of a displayed image and a longitudinal focal length contributing to longitudinal enlargement of said displayed image, said lateral focal length being shorter than said longitudinal focal length; and a diffraction means located so as to diffract a light condensed by said light condensing means toward an observer in a mobile unit, said diffraction means having a longitudinal focal length contributing to longitudinal enlargement of said displayed image and a lateral focal length contributing to lateral enlargement of said displayed image, said longitudinal focal length of said diffraction means being shorter than said lateral focal length of said diffraction means. - View Dependent Claims (11)
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Specification