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Headlamp with bifocal parabolic reflector for motor vehicle - projects visible dipped beam in conjunction with horizontal beam of filtered UV emission from discharge lamp
Headlamp with bifocal parabolic reflector for motor vehicle - projects visible dipped beam in conjunction with horizontal beam of filtered UV emission from discharge lamp
The discharge lamp (3) is installed at one focus (8) of the composite reflector (2) which has an elongated upper section (4) and a shortened lower section (6) with a common optical axis (5). The upper section (4) having its focus (7) behind the lamp (3) reflects a dipped beam (18). The lower section (6) is irradiated with ultraviolet emission through a filter (17) on the underside of the lamp (3), opaque to visible light. The main beam (19) renders fluorescent objects visible without dazzle. ADVANTAGE - At least part of ultraviolet emission is utilised to improve visibility at long distance e.g. in fog.
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