Method pertaining to vehicle headlamps which emit ultraviolet li

Details Method pertaining to vehicle headlamps which emit ultraviolet li Method pertaining to vehicle headlamps which emit ultraviolet li

1993-08-25

1995-09-05

Lazarus, Ira S.

Illumination

Light source and modifier

Including selected wavelength modifier

362 61, 359350, F21V 900

Patent

active

054484618

ABSTRACT:
A method pertaining to vehicle headlamps which emit ultraviolet light and which include a light source for generating both ultra-violet light and visible light, and a filter which is placed in the beam path between the light source and the surroundings and which is intended to substantially filter out visible light and to transmit ultraviolet light, said headlamp, however, unintentionally transmitting a given proportion of visible light, such as red and blue light, of low intensity. The invention is characterized by arranging the headlamp (1) so that the light source (2) and the filter (5; 6) in combination will intentionally allow a predetermined proportion of visible light of a light colour to pass therethrough; by causing said visible light to be sufficiently strong to dominate over said unintentionally emitted light on the part of a viewer, and by causing said predetermined proportion of visible light to have an intensity which lies beneath the intensity at which the light intentionally emitted would dazzle a viewer in combination with any other visible light intentionally emitted by the headlamp. The invention also relates to an arrangement.

REFERENCES:
patent: 2382939 (1945-08-01), Koch
patent: 3887744 (1975-06-01), Tomita et al.
patent: 4167490 (1979-09-01), Looney
patent: 4586116 (1986-04-01), Kasboske
patent: 4664470 (1987-05-01), Yerazunis
patent: 4970628 (1990-11-01), Bergkvist

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