Compact elliptical infrared light unit for a motor vehicle
First Claim
1. A motor vehicle light unit comprising:
- a reflector defining two focal regions;
a light source located in one said focal region in such a way as to produce a pool of reflected light in the other said focal region; and
a lens in front of said other focal region for converting the said pool of light into a beam and for projecting the said beam forward from the light unit, wherein the light unit further includes a filter between the reflector and the lens, the filter being opaque to visible light and transparent to infrared light, and filter-carrying means mounting the said filter for moving the filter between a first position out of the path of the light passing from the reflector to the lens, and a second position in which a substantial part of the said light passes through the filter.
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Accused Products
Abstract
An infrared light unit for a motor vehicle includes a light source, a reflector having two focal regions and a lens. The light source is in one of the focal regions and produces a pool of reflected light in the other focal region, and the lens converts this pool of light into a beam projected on the road. The light unit includes, between the reflector and the lens, a filter which is opaque to visible light and transparent to infrared light, and which is movable between a position out of the path of light going from the reflector to the lens, and an active position in which all or most of the light going from the reflector to the lens passes through the filter.
28 Citations
10 Claims
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1. A motor vehicle light unit comprising:
- a reflector defining two focal regions;
a light source located in one said focal region in such a way as to produce a pool of reflected light in the other said focal region; and
a lens in front of said other focal region for converting the said pool of light into a beam and for projecting the said beam forward from the light unit, wherein the light unit further includes a filter between the reflector and the lens, the filter being opaque to visible light and transparent to infrared light, and filter-carrying means mounting the said filter for moving the filter between a first position out of the path of the light passing from the reflector to the lens, and a second position in which a substantial part of the said light passes through the filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a reflector defining two focal regions;
Specification