US2006140A - Illumination - Google Patents

Description

June25, 1935. H NIN 2,006,140 I ILLUMINATION Filed Jan. 15, 1935 Pgl. I I

[AZ-VENT UR WZ'LHELMHUNZNG' Hrs A'T'T'QRNEY UNITED "STATES PATENT OFFICE ILLUDIINATION Wilhelm Honing, EindhovenrNetherlands, assignor to General Electric Company, a corporation of New York Application January 13, 1933, Serial No. 651,593

In Great Britain January 15, 1932 2 Claims. (Cl. 240-4125) My invention relates to illumination and more flecting shield l4, preferably semi-spherical, is particularly to vehicle headlights and electric located therebelow. lamps therefor. Still more particularly my in- Referring to Fig. 1, the construction according vention relates to a headlight having a lamp comto my invention comprises tilting the reflecting prising a bulb having a light source therein and a shield I so that the plane .l-l passing through concave reflecting shield disposed in juxtaposition the edge of the opening thereof intersects the therewith to produce a desired beam pattern. axis I! of the reflector Ill at an acute angle, Electric lamps for headlights are known in which preferably about twelve degrees. This arrangea concave reflecting shield is disposed below a ment provides abeam pattemas illustrated by l6 filament within the buib, the plane in which the (Fig. 2) which comprises asector of less than 180, open edge of said shield lies being horizontally resulting in a decrease of the glaring eifect. The disposed in the coinciding axes of the reflector shield may be arranged so that the axis I3 of the and lamp, that is, the opening of the shield is lamp and reflector does not intersect it, or it directed at right angles to the said reflector and maybe placed in the said axis. Said shield may 5 lamp axes. The said filament is disposed in adbe made reflecting or dull and have any desired vance of the focal point of the said reflector and, shape 'such as a trough or a hemispherical shape. by means ofthe said shield located therebelow, a In Fig. l, the normal to the plane |-l lies in passing beam pattern is produced comprising a the vertical plane passing through the axis l3. In semi-circular cross section with a flat top to pre- Fi 3 th hi I4 is 50 arranged t t t vent glare above the horizontal. A second fllaail to the plane passing through the edge of ment is e a y d sposed at t e focal point of the opening thereof intersects the said vertical said reflector to project the light straight down plane passing through the axis l3, that is, the e r0811 Ordinary v g p p In 0011- shield opens out in a direction making an acute tradistinction to this known construction, the angle t said vertical plane This arrangement beam w a cross section cofnprismg Sector one of the radii 18 of the resulting sector makes h an angle smaller than 180 tomslireagreat' an acute angle with the horizontal, while the er degree glarewlth the 01d other radius l9 extends horizontally. The limitof semi'cimular cross. section ing radius I8 is, of course, located on that side of glaring light is thrown in an approaching drivers the mad upon which a vehicle is approaching, eyes when passmg' along mad which is not thus materially eliminating glare on that side,

' tirely smooth, due to the bouncing of the car and consequent elevation of the entire beam. Acgigg the other slde of the road is fully m 28:35; 2 335:531; iggggiz ggfiig f ggfi The construction represented by Fig. 3, is shown lamp as to provide the said pattern having across m 5 m which the filament 15 section of a sector of less than The light mounted on lead wires 2ll2l which are mounted in the 'upper portion of the quadrant in which on a stem press 22 in bulb 23 i g a base 24 the approaching driver is located is thus elimimounted thereon The mament 15 mounted nated, so that even if a rough road is encountered, on the end of lead and on another 40 said approaching driver will not be subjected to a lead wire 25 which is also mounted on the stem glaring light. Further features and advantages Press shield is mounted on of my invention will appear fromthe' following P Wire which is mounted on P lead wlre description of species thereof. What I claim as new and desire to secure by In the drawing Fig. 1 is a diagrammatic eleva- Letters Patent 0f the United States is: tion of a headlight construction according to my An electric p p ising a bulb havi g a invention and Fig. 2 is the beam pattern propair of light sources therein, one located ahead of duced thereby; Fig. 3 is a diagrammatic elevation the other, and a concave shield disposed below the of a modification and Fig. 4 is the beam pattern foremost light Source w the normal to the produced thereby; and Fig. 5 is an elevation plane in which the edge of said shield is located showing in detail, the construction in Fig. 3. making an acute angle with the horizontal plane Referring to the drawing, the headlamp 'compassing through the longitudinal a of Sa d prises a parabolic reflector III with a filament ll lamp, and also making an acute angle with the at the focal point thereof. A filament I2 is disperpendicular plane passing through said axis. posed ahead of the focal point, and a concave re- 2. A vehicle headlamp comprising a reflector objec of the prese t i v ti is to provide produces the beam pattern n (Fig. 4) in which 25 r cated making an alcute angle with the horizontal J plane passing through the axis of said reflector. and also making an acute angle with the perpendicular plane passing through said reflector axis, said shield being open toward the upper rear portion of said reflector.

WILHEIM I-IONING.

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