US1878646A - Light reflector - Google Patents

Description

Patented Sept. 20, 1932y UNITED STATES BERNHARD SCHNEIDER, OF EICHWALD'E, NEAR BERLIN', GERMANY LIGHT nnrrinc'ron Application mea october 24, 192e, serial No. aoaars, and in Germany August 22, 1929.

This invention relates to a reflector with `external or internal mirroring and having at its lower edge which is obliquely disposed to its axis, a cover plate which lextends from its shorter side and is adapted to disperse the `light in diffuse fashion. In contradistinction to the known constructions of reflectors .of this kind in which the cover plate consists of a separate piece fixed to the reflector, according to the present invention, the said light dispersing plate is made integrally with the reflector from one and the same piece of glass or other translucent material. Owing to the cover plate andthe reflector being made of one single piece of glass there results a form of construction which is suitable for mass production and which, moreover, permits the cover plate toV be completely utilized for giving out light, since the use of metal parts, such as are necessary for connecting a separate screen to a reflector of the kind referred to, is entirely avoided. Such metal parts increase the costs of production and darken the edge of the screen surface with which they are employed. As the introduction of the incandescent lamp from the underside of the reflector is not interfered with by the partial covering over of said underside, it is possible to make the upper edge of the reflector and the shade holder which engages the same narrower than when the lamp is introduced from the top, so that the loss of light through the opening atV the top edge is reduced. rlrhe reflector is provided either internally or externally with a metallic coating andl lboth the reflector and the cover plate, instead of being made of glass, may be constructed of some similar material, such, for instance as porcelain.

A further important feature of the invention consists in arranging the light dispersing plate to cover so much of the underside of the reflector and extending the reflector wall opposite said cover plate so far downwards that in every aspect of the reflector in which the axis thereof remains vertical the source of light is practically invisible. As a result "In the drawing Figures l and 2 illustrate rethe spectator without his being dazzled, since only diffusely dispersed light is permitted by the cover plate to reachl his eyes. This, possibility of using both sides allows the reflector, instead of being located between the spectator and the space to beilluminated, to be arranged'at-the rearward end of this space or to be used atl the Sametime for 'lighting up the space close to the spectator. Owing to its freedom from dazzling the rel6G flector can 'also be disposed in arposition intermediatebetween that inwhich the longer side wall is turned tothe observer and that in'which the shorter side wall is so turned, so

that freedom of choice as to the place where ,it is set upis stillfurther enlarged. At the same time an veective and powerfulV concentration of light on to the desired place, with` out dazzling, is ensured for all settings ofthe reflector. n

The invention will be more fully described by reference to the accompanying drawing showing by way of exemplilication an embodiment of the principle of this invention.

spectively in sectional view and in front elevation a form of constructionv in which the reflector and the covering disc constituteone single piece of glass. i v

The reflector lof glass in, accordance with 8o the exemplilication of Figures 1 and' 2 of the drawing partially surroundsthe electric incandescent lamp 2 which is retained at the upper edge ofthe reflector by means of a yoke n or a cup holder 3 at the outside of which the '85 n means for suspending or retaining the reflector, such as for instance a cord, a bolt, hook or the like are suitably disposed. One side of the wall of the reflector extends considerably more downwards than the other '90. portion of the wall, so that the lower edge of the reflector is situated in a plane at an angle to the axis of the device. A portion of the bottom part of the reflector is closed by an translucent or transparent disc or plate 4 95 which'extends from the shorter side ofthe wall of the reflector and is made in one piece therewith and preferably covers up about' half or even a somewhat larger portion r,of the lowerV open side of the reflector. The los lower edge of the disc or plate 4 may be straight or curved. At its outside the reflector 1 is provided with a coating of deposited silver 6, while the outside kof the disc 4 is ground, dimmed, iiuted or roughened so that the light on passing through this plateV will be-diused'and dispersed. The reected light is causedto pass@ to the outside through the lower opening 7 of the refiectorand may be directed to the particular part of the space to be illuminatedby correspondingly adj-ust'-` ing the position of-:the refiector. -Inasmuch as the plate 4 will only allow ditl'usedlight to pass no dazzling action can occur even in case the shortside of the wall of the reflector is made to face the observer, and it becomes possible byA this meansto also light up the space around the observer. In every position v of the reflector a very intense illumination of the particularzone to be irradiated is accomplished and without any danger of4 dazzling action, and the reflector becomes, therefore, likewise adapted for the purpose of producing illumination by diifused light.

A. combined light reflector and diffuser having a reflecting shell. forming a truncated ovoid .with a singlegplaneiof, truncation at substantially to the major axis of the shell and intersecting saidaxis adjacent the center thereof, andV a diffusing plate extending along the plane ofitruncationx rom'the shortV V side of the shell to the said majoraXisl and terininatingin an edge at rightanglestosaid inaJor axis.

In testimony whereot1 I aiiX my signature. e

BERNHARD SCHNEIDER. p i

Images