US1622764A - Glareless lamp - Google Patents

Description

Patented Mar. 29, 1927'.

UNITEDSTATES PATENT oFFicE.

ARNLD VIVLiAN CASSELS, OF SOUTH BRSBANE, QU EENSLAN D, AUSTRALIA, ASSIGNOR 0F THREE-EIGHTHS TO JAMES MLNE STEWAET, OF SOUTH BRISBANE, AUS- TRALIA.

GLARELESS LAMP.

Application filed August 29, 1925, Serial No. 53,414, and in Australia October 6, 1924,

This invention is for improvements in and relating to glareless lamps and refers more particularly to the elimination of glare or dazzle from lamps for artificial illumination in domestic, manufacturing and like uses and is especially adapted for motor car, tramcar, locomotive and suchV headlamps.

it present with the rapid development of high powered and fast motor transport it is necessary that at night the roadway be strongly illuminated in front of the car. The throwing of intense beams of light along the roadway is satisfying to the driver' but is found to be a constant source of danger to persons moving towards the light. ln some cases dimming or dipping of headlights is resorted to and in others, attempts are made to prevent the glare by various devices. Dimming objectionable inasmuch as the driver is thrown into a state of temporary darkness at a critical stage whilst with glare prevention devices there is a tendency to so interfere. with the rays that the efficiency of the light is depreciated.

It is known that coloured screens are used to eliminate glare, but their use, for example in headlamps of motor cars has led to diminished efficiency in lighting.

The object of this invention is to `produce a glareless light without reduced ediciency by fusing or merging in a novel manner by means of reflectors the rays emanating from two or more sources of light consisting of tinted or colored translucent electric light lamps.

For bringing about the fusing or merging the rays of light from the tinted or colored lamps I employ an amber tinted or colored translucent electric light lamp for absorbing the violet rays and a green tinted or colored translucent electric light lamp for absorbing the red rays.

lVithin a suitably` shaped shell are securedV two reflectors of approximately the same convexity. The rear reector is of solid metal or material and has an amber tinted or Colored lamp in front of it, the other reflector is perforated and polished on both sides and has in front of it a green tinted or colored lamp. The lamps may be of the required density as may be found best suited according to the use to which the lamps are to be put.

In order that the nature of the invention may be more particularly described reference will be made to the accompanying sheet of drawings in which like numerals refer to like parts-in the different figures,

Fig. 1 is a vertical cross section of a m0- tor head lamp showing two reflectors and two electric light lamps in relative position.

Fig. 2 is a perspective View of a motor head lamp embodying the present invention in-which the mounting of the electric light lamps is modified. l

The shell l may be of any convenient shape, that shown in the drawings being only as an example of approximately the type that would be adopted when my invention is applied to motor car head lamps. The shell l has two reflectors 2 and 3 secured therein. The rear reflector 2 is solid and is polished on the face. The front reflector 8, which is of approximately the same convexity as the reflector 2, is polished on both sides and is perforated with holes 4. The holes /lare or increasing diameter towards the circumference of the reflector 3, and they may be round, oval or other shape, as desired.

The electric light lamps 5 and 6, which are translucent and are tinted or colored amber and green respectively are mounted in front of the reflectors 2 and 3 respectively.

In the arrangement shown in Fig. 1 a double socket 7 (which may be either the bayonet or screw socket type) is fitted in the reflector 3, and, in the arrangement shown in Fig. 2, separate sockets 7ZL 7b are fitted in the reflectors 2 and 3 or on the back or face thereof, as the case may be. The electric light lamps 5 and 6, which I prefer to use, especially in the case of motor vehicle headlights, is a four candle power lamp for reflector 2 and a thirty-two candle power lamp for reflector 3. It will be understood that lamps of other candle power can be used according to the purpose of which my irnproved lamp is to be put. Wires 8 and 9 from the socket 10 of an adaptor lead to the .sockets 7 or a and 7b, as the case may be. The usual len-s 11 is provide-d in the front of the lamp.

The illustration of the invention has for convenience been directed to motor car head lamps but it will be understood that the in vention may be equally Well applied to other uses Where a soft diffused light with glare eliminated is required, as for example in indoor illuminating of shops and stores especially those in which it is desired to display coloured goods to advantage.

The invention will also be found useful in indoor photography and may be adapted for household lighting.

Slight changes and alterations might be resorted to in the 'forni and arrangement of 'the several parts described Without departing from the spirit and scope of the invention, hence I do not Wish to limit myself to the exact construction as herein described nor to any particular coloured bulbs.

What I claim as my iuv'ention and desire to secure by Letters Patent is z- 1. In a glareless lamp the 'combination of a shell7 two colored translucent electric light lamps disposed in said shell, a piain reflector also arranged Within the shell and coacting with one of said lamps, and a perforated double sided reflector coacting with both of said lamps.

2. In a glareless lamp the combination of a shell, an amber colored electric lamp disposed in said shell, a. plain reiiector also arranged in the shell and coacting with the lamp, a green colored electric lamp disposed in the shell, and a double sided perforated reflector also arranged within the shell for coacting with said lamps.

A glareleffs lamp according` to claim 2, wherein the plain reliector is situated at the back of the amber colored electric light lamp Whilst the perforated reflector is situated in front of the amber colored electric light lamp and behind the green colored electric light lamp7 substantially as and for the purposes set forth.

In testimony whereof I ailix my si gnature.

ARNOLD VIVIAN CASSELS.

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