US1413315A - Reflector - Google Patents

Description

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1,413,315. Specification of Letters Patent.

Application filed September 5, 1919. Serial No. 321,921. To all whame'tmay concern:

Be it known that I, PERCY EDWARD Conmanna subject ofthe King of Great Britain and, Ireland, residing at Verco Buildings, North Terrace, Adelaide, State of South Australia, Commonwealth of Australia, have invented certain new and useful Improve- I ments in Reflectors, ofwhich the following isa specification.

This invention relates to certain new and useful improvements in reflectors applicable to headlamps for vehicles and to other lamps. A primary object of the invention is to prd'vide an improved reflector for headlamps for vehicles and the like whereby a roadway in front of a vehicle equipped therewith may be efliciently illuminated at night from a point in the proximity of the vehicle to a point well in advance thereof; the illumination thereby afforded being entirely free from streakiness such as is commonly present by many headlamps-at present in use, and whic streakiness results from the formation on the roadway of distorted or imperfect or other images so as to constitute a source of discomfort or danger to drivers of vehicles, and pedestrians by reason of the eyes of such being temporarily blinded by light of excessive intensity.

With a view to the attainment of the hereinbefore stated object, the invention comprises a reflector having a highly light-diflu sive, light-reflecting surface and a very slightly light-diffusive light reflecting surace.

The elimination of, streakiness in roadillumination is considered and has been found to be a matter ofvery great importance. The illumination of a roadway is also very much clearer and more uniform by the elimination of streakiness.

Reference is made to the accompanying drawings in which like characters of reference indicate like parts in both views. Figures 1 and 2 represent respectively sectional and front views of-the improvement Re ferring to the drawing B is a paraboloidal reflector formed by spinning or otherwise in accordance with well known practice from sheet-metal, and having its concave light refleeting surface electro-silver plated so as to ensure high light reflectivity thereof, serving to concentrate and to direct or re-direct lated surface.

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' impinging thereupon-the said filament being sultably positioned just inside or behind the focus of the paraboloidal reflector so that practically the whole of the light reflected from the lower portion or half of the reflector is downwardly directed. In my re flector prior to applying the coating of silver the inner surface of the reflector 1s frosted, granulated orroughened. The upper portion a of the reflector is heavily frosted, granulated or roughened so that when the silver coating is applied the frosted granulated or roughened surface is substantially retained, thereby enlivening or rendering the surface highly reflecting. The lower portion 6 of the reflector is slightly frosted, granulated or roughened, so that the frosted,

a practically smooth surface when the ow Patented Apr. 18, 1922.,

ing of silver is applied. It is to be under-f stood that the light-diffusivities of the said upper and lower portions or halves of the said concave surface of the said reflector may be varied within such limits as may be compatible with the respective required functionings thereof, it being understood that with respect to the slight lightdiflusivity the slightest such nation of streakiness from the illumination afforded is preferably employed.

The'slightly llght-diifusive surface repared as aforesaid will be seen to exhibit a slight sheensuc-h bein an' appearance light-drfi'lb Y s'ivity which will ensure the desired elimi-- quite distinct from that o a true frosting as enerally denoted by such term.

at I claim is 1. A reflector having its' concave surface roughened, one half of 'the surface being sur ace coated with silver. 2. A reflector having a concave rougher than the other half and thewhole granulated surface, the upper half bein heavily grann lated and the-lower half slig tly granulated and a coating-of silver OII'lZhBSBld gran'u- In testimony that I claim the as my invention I have signed my name :in

resence of two subscribing this th da ofJul 1919.

P ROY, I DW-ARD CORRELLJ Witnesses: g

Gmms Nronoms COLLISON, 1 ARTHUR Gone COLLISON.

witnesses

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