US1845214A - Spotlight - Google Patents

Description

Feb. 16, 1932. F. P. ARROUSEZ SPOTLIGHT Filed July 5, 1929 2 Sheets-Sheet l HTTORNEY 16, W32. F. P. ARROUSEZ 1,845,214

SPOTLIGHT Filed July 5, 1929 2 Sheets-Sheet 2 f/vws/v T'OR fkA/VK A? Aexeousaz A 7' TOR/YE Y Patented Feb. 16, 1932 PUNITED STATES ATENT OFFICE r naiixriannonsnz, or nos ANGELES, canrronnra, assrervon r cmmra s'rrrmos SUPPLY .oonrona'rron', LTD. or HOLLYWOOD, canrromrm. a conrona'rron or cmroam I J sro'rmen'r a M invention relates to lamps, and morepartlcularly to a novel form of photographic Still a vention will spot-light-such as is used in the motion-picture industry. 3

Spot-lights at present used in this industryare very bulky and are relatively difiicultto move from lace to place.

It is an object o my invention to provide a rigid spot-light of light weight having desira 1e optical characteristics.

A-further'object of my invention is to provide alamp having a large radiating surface for dissipating the heat generated by the light source therein.

further object of the invention is to provide a novel lamp structure in which all noises due to the expansion of the parts have been eliminated, thus preventing the extraneous noises so objectionable in the making of talking pictures.

A further object of the invention is to provide a photographic lamp which will not form dark rin near the outer portion of the leak-light iverging from the main beam. 7 r

These and other objects I accomplish by the use of a corrugated reflector bounding the light chamber and separating this chamber from the surrounding area.

A further object of the invention lies in this novel corrugated reflector construction.

Further ob'ects and advantages of thisinmade evident hereinafter. In the drawings, I have illustrated the preferred embodiment of my invention, Fig. 1 illustrating a side view of my lamp.

Fig. 2 is a cross-sectional view taken or! the line 2-2 of Fig. 1. I

Fig. 3 is a cross-sectional view takenon the line 3-3 of Fig. 2.

Fig. 4 is an enlarged fragmentary view of a ortion of Fig. 3. v

ig. 5 is a diagrammatic perspective view of the lamp-ad usting mechanism of .my invention.

The lamp of my invention comprises front and rear frames and 11 respectively, which are preferably formed of cast aluminum, or a similar light-weight metal.

Between these frames is positioned a reflector 12 which is preferably formed in sections, there being a pair ofcorresponding side sections 13 .andv 14, the sides of which fit in side channels 15 and 16 formed in both frames 10 and .11. These side sections are corrugated as best illustrated in Fig. 2, the

side channels 15 and 16- being of suflicient width to. accommodate these corrugations.

The ends of these corrugated side sections do not meet, but are separated by-chimney spaces 19 and 20 which are in vertical alignment with each other. Covering thechimney space 20 and overlappingthe endsof the'side sections 13 and 14 is an auxiliary corrugated reflector 21, the sides of-which are mounted in an upper auxiliary channel 22 of an upper extension 23 formed on each frame. A similar auxiliary corrugated re.- flector 24 covers the chinmey space 19 and extends in overlapping relationship with the ends of the side sections 13 and 14, this auxiliary reflector 24 fitting in a lower auxiliary channel 25 formed in .a lower-extension 26 of each frame. The auxiliary corrugated reflectors are separated from theside sections 13 and 14 so as to provide small spaces 28 through which air may pass.

The frames 10 and 11 are clamped against the sides of the side sections 13 and 14 and the auxiliary reflectors 21 and 24 by means of a plurality of tie rods 28a extending between these frames and providing nuts 29 threaded thereto which may be tightened to increase the clamping engagement between the frames and the corrugated members forming the reflecting surfaces. I have found that sucha These tie rods. also cooperate with a supporting means for the lamp, this supporting means being shown in the form of a pin mounted on a strap 36 suitably. secured togL jacent tie rods 28a. A plate 37. has an opening to receive the pin 35, this plate being secured to uprights 39 which are in turn secured andther so be ledge 47 of the rear frame 11, as best shown in.

Fi 3 and 4.

' rear frame also provides an annular countersunk portion 49 in which the flange of a cover 50 is retained as by screws 51 passing therethrough and threaded into the rear frame 11. This cover is preferably, although not necessarily, corrugated, the corrugations preferably extendin concentric with the axis of the'beam of e light, as best shown in Figs. 3 and 4. The mirror 46 is retained in place by s ring clips 52 suitably secured to the cover an bearing against the rear surface of the mirror.

Also extending between the front and rear frames 10 and 11 are rods 53 and 54, the former being in the form of a long bolt rigidly secured in place by a nut 55, and the latter being threaded through at least a portion of its length and being suitably journalled in both the front and rear frames 10 and 11. A crank 57 is adapted torotate' the rod 54 to move a carriage 58 relative thereto. This carriage has an arm 58a through which the rod 54 is threaded and has an arm 59 adapted to slide along the rod 53. This arrangement is best shown in Fig. 5. A suitable base 60 for a light source 61 is provided on the carriage 58, this light source eing shown in the form of an-incandescent lamp. Obviously, I am not limited to this form of ht source.

Held in lace'by certain o the tie rods 28a 53 and 54 are retainers 63 these retainers being three in number and provided for holding a screen or glass in the path of the rays transmitted from the light source 61 and reflected from the mirror 46 and the reflecting surfaces of the corrugated memrs. The corrugated members, as well as the cover 50 are referablymade of aluminum, this material ing not only 1i ht in weight, but having superior heat-con ucting pro erties. Previous lamps have been extremely bulky, and difficult to-move from place to place. On the other hand, my invention is not only compact and occupies no unnecessary space, but is also very light in weight, the weight of my lamp being substantially half the weight of certain other lam s of equivalent size at resent in use, and in substantially 30% 'ghter in weight than the lightest weigh lamp of equivalent capacity at present use.

,flector plate such as is ordinarily usedi With my lamp there is thus no danger of an operator becoming burned by touching the exterior thereof as is the case with other lamps. having similar heat-radiating surfaces.

These corrugations find utility in my invention whether or not the inner surface thereof is brightened so. as to act as a reflecting surface. In this latter capacity, however, I have found that a beam of light cast by the lamp of myinvention is superior to those at present used in the motion-picture industry inasmuch as no dark rings are formed in the leak-1i ht diffused outward from the main beam. his feature is an important one in motion-picture work where even illumination is essential.

If desired, the mirror 46 may be dispensed with and the internal surface of the cover 50 may be brightened to act as a reflecting surface. If corrugations are rovided in this cover, the beam cast by the 'ght will be a very diffused one. However, with the construction illustratedin the drawings, it is not essential that this cover be corru ated inasmuch as the mirror 46 revents the 'rect rays of the light source rom reaching this cover. I have found however, that the mirror will be kept cooler by the provision of corrugations on the cover 50.

I claim as my invention:

1. In a photographic lamp, the combination of: front and rear frames having channels therein; a pair of reflectors between said frames and having their sides in said channels, said reflectors bounding a light chamber and being separated at their upper and lower ends; a light source in said light chamber' and means for clamping said frames agalnst said sides of said reflectors.

2. In a photographic lamp, the combination of: front and rear frames; a pair of reflectors between said frames and clam d between said frames, the ends of said re ectors being separated to form a chimney; and

an auxiliary reflector clamped between said frames to cover said chimney.

3. In a photographic lamp, the combination of: a pair of frames having channels transversely between said frames, f

ght chamber and separating 'sai light chamber from the surrounding atmos here whereby heat generated in sai light c amber is conducted through said corrugated member and radiated into s ace; means for moving said frames towar each other to clamp said corrugated member rigidly therebetween, the compression set up in said corrugated member thus being along the length of said corru ations rather than transverse glieereto; an a light source in said light cham- 5. In a photographic lamp the combination of: a air of frames; a reflector means positioned between said frames and defining a light chamber; a light source in said 1i ht chamber; and a pair of rods extendin etween said frames and on which said dight source is movable.

6. In a photographic lamp, the combination of: a front frame; a rear frame, there being corresponding channels formed in said frames; a corrugated reflector extending between said frames and having the corrugations thereof extending transversely between said frames, the ends of said corrugated reflector extendin into said channels; packing means in each 0 said channels and engaging the ends of said corrugated reflector to pre-' vent any expansion noises due to a relative ex ansive movement of said reflector and said frames; and means for clam ing said frames and said corrugated re ector together.

7. In a single-walled lamp structure, the combination of a light source; a corrugated member defining the boundary of a light chamber inwhich said light source is positioned and formed of a material having a high heat conductivity, the interior of said corrugated member being directly exposed to the rays of said light source, and the exterior of said corru ated member being directly exposed to t e surrounding atmospliers whereby the heat generated by said ight source is radiated into space; and a rigid frame bounding said corrugated memher in supporting relationship.

8. A photographic iam including in combination a corrugated re ector having a sinuous edge; a frame providin a channel of width suflicient to receive sai sinuous ed packing means between said sinuous e ge and the bottom wall of said channel; and means for forcing said corrugated reflector into said channel against said packing means.

9. In a photo aphic lamp, the combination of: front andi'ear frames each provi a pair of side channels spaced from ea other and a pairof auxilia channels one above and one below the said side channels thereof; a air of corrugated side reflectors extending tween sai frames, the ends said corruthereof extending into said side channels; I. gated member defining the boundar pair of auxiliary corrugated members extending between said fram the ends thereof extending into said auxilia channels and means for securing said ames, sai side reflectors, and said corrugated members together.

10. In a photographic lamp, the combination of: a pair of frames, each frame providin side and auxiliary channels therein si e wall means extendin between sai frames and into said side c annals of said frames to define a light chamber, said side wall means providing separated ends defining a chimney space; an auxiliary enclosing member extending between said frames and into said auxiliary channels thereof and tioned in overlappin relationshi wit spect to said separate ends of sai side wall means and spaced therefrom to permit circulation through said chimne means; packin means in said side and auxiliary channels 0 said end frames; and means for forcin said frames toward each other to clamp sai side wall means and said auxiliary member therebetween and against said ackin means.

In testimony whereof, have ereunto set my hand at Los Angeles, California, this 1st day of July, 1929.

FRANK P. ARBOUSEZ.

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