Headlamp focusing method

Details Headlamp focusing method Headlamp focusing method

1975-09-24

1977-03-01

Corbin, John K.

Optics: measuring and testing

Focal position of light source

356122, G01J 100

Patent

active

040099660

ABSTRACT:
A headlamp with a parabolic reflector has a filament mounted on lead wires attached to a support disc which is slidably and angularly adjustable within a cylindrical ferrule attached to the reflector so as to permit positioning the filament at the reflector focal point whereupon light from the filament will be reflected as a parallel beam from the reflector. The invention contemplates an improved method for focusing the filament including locating a planar mirror on the optical axis of the parabolic reflector for redirecting light parallel to the optical axis from the reflector back to the focal point of the mirror and wherein terminals of the filament are electrically connected to a power supply and to a meter to detect electrical resistance changes in the filament to indicate location of the filament at the focal point where light rays reflected from the flat planar mirror directly impinge on the filament to cause increase in its electrical resistance.

REFERENCES:
patent: 1894911 (1933-01-01), Morgan et al.
patent: 3614439 (1971-10-01), Beelik et al.
patent: 3732415 (1973-05-01), Lindae
patent: 3918814 (1975-11-01), Weiser

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