Motor vehicle headlight with condensing lens and diaphragm

Details Motor vehicle headlight with condensing lens and diaphragm Motor vehicle headlight with condensing lens and diaphragm

1982-11-30

1985-05-14

Nelson, Peter A.

Illumination

Light source and modifier

Plural serial lens elements or components

362 80, 362 83, 362309, 362328, 362310, 362329, 362339, 362331, 362337, 362347, 362350, F21V 500

Patent

active

045176302

ABSTRACT:
The optic axis of a vehicle headlight comprises a reflector, an incandescent helix and a convergent lens. The reflection surface of the reflector is parabolic in the horizontal midplane section and is elliptical in vertical median section. A narrow band of light spreading out laterally is thus produced without supplementary optical components, particularly the diffusion disk or dispersion lens. A sharp light-to-dark boundary is obtained by a diaphragm having an effective straight edge 18 located below the outer ellipse focus, which is coincident with that one of the principal foci of the converging lens which is the nearer to the reflector.

REFERENCES:
patent: 1393573 (1921-10-01), Ritter
patent: 1758041 (1930-05-01), Heyman
patent: 1871629 (1932-08-01), McMenamin
patent: 2647203 (1953-07-01), Smith
patent: 3377479 (1968-04-01), Schreiber
patent: 3745325 (1973-07-01), Harvey
patent: 3955077 (1976-05-01), Jones et al.
patent: 4066887 (1978-01-01), Levis
patent: 4209825 (1980-06-01), Shackelford
patent: 4246631 (1981-01-01), Draper et al.
patent: 4305119 (1981-12-01), Draper et al.

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