US1321521A - Machine fob photogbaphic lighting - Google Patents

Description

J. M. GREEN. MACHINE FOR PHOIOGRAPHIC LIGHTING.

APPLICATION FILED NOV- 30-1918.

Patented Nov. 11, 1919.

I vwewlioz 5 7163M Green,

76 t ai JAIMES M. GREEN, OF GHICAGOQILLINOIS.

' MACHINE FOR PHOTOGRAPHIC LIGHTING.

Specification of Letters Patent.

Patented Nov. 11, 1919.

Application filed November 30, 1918. Serial No. 264,835.

Lighting, of which the following is a specification.

My invention relates tomachines for lighting photographic studios, and other similar work where photographic lates or films are used, and one of the 0 jects of my invention, is'to secure a maximum of results upon the plate or film, from a minimum of illumination. As is well known, the emulsion employed on the ordinary .photographic plate or film. is highly sensitive to the light from the violet end of the spectrum, but only very slightly afl'ected bythe light from the remainder of the spectrum. As a result, only a very small portion of the light usually employed known as white light is of any effect, as only a small portion of it consists of the violet rays.

To accom lish my said object I employ a machine fgr lighting in which I arrange a special combination of adjustable clear and colored lights and colored reflectors, so arranged that all of the colors are blended to produce a violet ray, and adjustable so that the entire illumination may be directed upon the objects to be photographed,

a design arranged for seven incandescent thereby securing a maximum of results from the illumination.

The above, and other ob ects are secured by the special means illustrated in the accompanylng drawings and described in the following. specification and therein more particularly pointed out and. claimed.

In the drawings forming part of this specification, in which like numerals of reference refer to similar parts throughout the various views,

Figural is a front elevation of one style I of my machine as designed for lighting photographic studios.

Fig. 2 1s a side elevation of the same. Fig. 3 is a sectional view of the lighting head, along the line 3-3 of Fig. 1, showing the arrangement and relative location of the various parts emplo ed.

Fi 4 is a detail view 0 one of the ad justa le lighting units, with reflector.

Referring to the accompanying drawings,

I have shown my machine as supported upon a standard 1, which may be of any usual design, but I have referably shown it as supported upon a pedestal having feet at 2. I have also preferably shown a'standard in which the parts are made to telescope as shown at 3, to permit the raising and lowering of the lighting head, as may be required in operation. At 4 in the standard I have provided an adjustable joint for the purpose of adjusting the lighting head forward or backward, as may be required for the special service for which it is used. This adjustable joint is especially shown in the detail drawing at Figs. 1 and 2. j

The lighting head consists of the outer casing, or body part 5, containingand supporting thev other parts hereinafter 'described, which said casing is of substantially the form shown. It is suitably wired for electric light service which is not shown, one wire being-carried to each of the light units hereinafter described. At the front of said casing, I have provided J an open case 13 for holding the screen 10 and the lens 11. Said case is hinged to the easing at 14 and has a suitable catchfor holding it in position at 15, thus permitting the free openin and closing of said case for convenience 1n adjusting the lighting units, and the reflectors, as hereinafter more par.- ticularly described.

In my illustrationFig. 1, I have shown 1i hts, one in the center, and one at each point of a hexagon surrounding said center, and have indicated them by the numeral 7. Arranged in the rear of each light, I have provided a small reflector 8, arranged to throw the li ht from the light in front of it, directly orward. In the rear of these reflectors, and forming a lar e reflector to reflect forward any rays w 1ch may not be reflected forward by the individual reflectors 8, I have provided the large refleeting surface 9, which is concave in its to permit each lighting unitto be adjusted 1 toward the center, or away from the center thus aflording a ready facility for adjusting the lights to throw the full lighting upon the particular objects desired to be illuminated.

In front of said"lights, I have provided the lens 11, for the purpose of condensing the rays of light upon any particular-object, and also for the purpose of blending the rays' from the various light units as" arranged as shown in Fig. 1, with'a." large.

clear'electricv lamp at the center, having a clear or polished reflector in its'rear, while arranged about it in. their order, I employ smaller electric lamps, (the shade of each lamp and its individual reflector being the -same,) colored rose madder, cobalt blue,

. crimson lake, pink madder, carmine and Prussian blue. The reflector 9 I p e ferably tint blue, thereby providing a reflection for any rays escaping from the individual reflectors 8 which-will blend them into the one common tint desired to be attained.

By this construction and arrangement, I secure a combination of colors which forms the nearest approximation to violet rayjwhic h has "heretofore been produced, and a color which can be. directed directly upon the objects to be illuminated, and which will as produce the maximum of eflectupon the photographic plate or: film employed .without othercolor screen, orotherdevice employedheretofore-to harmonize the colors, and each" of which greatly retards the time of exposure. I I

While I have illustratedand described my invention as employed for photographic purposes inphotograph studios, and the like, I do "not wi'shto be confine d exclusively to that class of work, as the same arrangement may be equally well employed in making negatives 1 for moving picture films, for printing moving picture films from such negatives, for making lantern slides and transparencies, and for use in the usual work of printing on photographic papers.

Having thus described my invention, what Icl'aim and desire to secure by Letters Patj ent,"is the following:

' -'lighting,' the'combination of a large refiec tor; several lighting units adjustably mounte'd in"ff'o'nt of said reflector; an adjustable 1. In a lighting system for photographic reflector mounted in rear of each of said light units; a screen supported in front of said light units, and a lens supported in front of said light units, substantially as shown and described.

2. In a lighting system for photographic studies and the like, the combination of a reflector adjustably mounted upon a support aplurality of light units mounted in front of said reflector; individual reflectors mounted in rear of each of said light units; a screen mounted vinifront ofsaid light units, and a lens also mounted in front of said light units, substantially as shown, and for the purposes'set forth.

3. In asystem for photographic. studio lighting and the like, the combination'of a reflector tinted blue, having one central clear light mounted in front of it,"and a plurality of colored lights mounted in front of said reflector; each of said colored lights being adjustably mounted, and each of saidcolored lights having an individual reflector ofthe same tint as itself; a screen mounted in front of said lights, and a lens also mounted in front of said lights, substantially as shown, and for the purposes set forth.

I. In a lighting system for photographic studios and the like, the combination of a large reflector; seven light units and seven:

individual reflectors, one in the rear of each light unit; said light units havingthe colors clear, rose madder, cobalt blue, crimson lake, pink madder, carmine and Prussian blue; each individual reflector having the same color as its respective lightv unit; a screen for. blending said colors; a lens also for blending'said colors to produce an approximation of the violet ray, substantially as shown, and for the purposes set forth.

5. In a'device for lighting photographic studios, and the like the combination of a lighting head adjustably mounted upon an adjustable standard; lighting units within the lighting head ad ustably mounted; a reflector in the rear of each lighting unit, a larger reflector in the rear'ofall the lighting units and reflectors aforesaid; a-screen in frontof said lighting units; and a lens also in front of said lighting units, all as shown and 'for the purposes'setforth.

In testimony whereof, I have hereunto set my hand in the" presence of two subscribing witnesses. I f JAMES M. GREEN.

Witnesses:

CHESTER W. BROWN, MARY J. PAnDoN.

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