Headlamp for automotive vehicles
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United States of America Patent
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Nov 13, 1990
Grant Date -
N/A
app pub date -
Jun 16, 1989
filing date -
Oct 22, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vehicle headlamp comprises a reflector and a headlamp glass constructed to produce a so-called full beam lobe when a light source is located in a predetermined position in relation to the reflector. The invention is characterized in that the light source (11) is constructed to transmit both a large proportion of visible light and a large proportion of ultraviolet light, and in that a filter (19; 22; 23) is located in the beam path of the headlamp and is effective in filtering that part of the light emitted by the light source (11) which gives rise to a light lobe corresponding to the difference between a so-called full beam lobe and a so-called dipped beam lobe. The headlamp is further characterized in that the filter (19; 22; 23) is constructed firstly to filter light so that substantially no light within the visible light spectrum will be transmitted through the filter, and secondly to transmit ultraviolet light.
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