US1364278A - Light-regulator for projecting moving pictures - Google Patents

Description

F. W. HOCHSTETTER.

LIGHT REGULATOR FOR PROJECTING MOVING PICTURES.

APPLICATION FILED MAR 24, 1919.

a nveM/coz Patented Jan. 4, 1921.

I STETTER, a citizen of the United States, and

a so

UNITED STATES PATENT omen- FREDERICK W. HOCHSTETTER, OF NEW YORK; N. Y., ASSIGNOR TO HQ PATENTS AND PROCESSES COMPANY, INC., A CORPORATION OF NEW YORK.

LIGHT-REGULATOR FOR PROJECTING MOVING PICTURES.

Specification of Letters Patent.

Application filed March 24, 1919. Serial No. 284,862.

To all whom it may con cern:

Beit'known that I, FREDERICK W.. HOCH- a resident of New York, countyand State of New York, have invented certain new and useful Improvements in Light-Regulators for Projecting Moving Pictures, of which the following is a full, clear, and exact specification. i

This invention relatesto a class of devices adapted to be used in conjunction with moving picture-machines.

My invention has for its object primarily 4 to provide-a simple and efficient device deunif ormly illuminated by the utilization of the direct rays oflight passing through the condensers of the machine as well as utilizing partially the angularly directed rays of li ht, and which is of a form adapted to be a justed so that the light employed in rejecting' the pictures .ma be regulate to meet VariOusdiStances. he invention con sists essentially of an apertured diaphragm adapted to be arranged in the path of projection of the pictures of a moving picture projecting machine so that the direct rays of light'o erative on the pictures will pass through t e" aperture, and adjustable on the diaphragm is.a slide or-element for cutting out the marginal rays of light.

Another object of the invention is to pro vide a reflector whereby part of the angularly directed rays ofthe light will'be deflected so as to merge with the direct rays of light prior to passage through the diaphragm.

A practical embodiment of the invention is represented in the accompanying drawing forming a part of this specification in which similar characters of reference indicate cor respondi parts in all the .views', the-said inventioii fiieing more fully describedhereinafte'r, and then ointed out in the claims at the end of the escription. J

In the drawing, Figure 1 is an elevation of a-moving picture projecting machine showing the manner of emfloying ncomunctio'n therewith one form 0 device embodying my invention. l

Fig. 2 is an enlarged lo itudinal vertical section taken through t e lens barrel of themachine and'also through the diaphragm of the device as applied thereto.

Fig, 3 is a perspective'view of the adjustable element used in the device.

Patented Jan. 4., 1921,.

Fig. "4: is a rear elevation'of the diaphragm used in the device.

Fig. 5 is a section taken on the line V V of-Fig. 4, and

Fight is a section taken on the line VI- of Fig. 5.

The device or regulator has a diaphragm, or plate 10 of a form and size. to adapt it to be disposed interiorly of the lens barrel, as

11, of a moving picture projecting machine, signed to be employed on a 'moving picture projecting machine whereby all parts of thepictures when projected on a screen Wlll be from one face of the diaphragm .10 at its periphery is a flange, or wall 16 of a dimen- 'sion similar to the size of the diaphragm for removably fittingclosely the interior of the lens barrel-of the, machine. Extending interiorly' of the flange 16 from the diahphragm 10 may be two parallel spaced guides, or grooved bars 17 and 18 arranged transversely of the diaphragm one'below and one above the aperture 15. of the diaphragm, and through the flange of the diaphragm' are two registered vertically disposed slots 19 and 20 which are also in registerwith the space between the grooves of the guide bars 17 and 18. Through opposite parts of the lens barrel of the machine may be registered vertically disposed pairs of slots 21 and 21 one pair between the lenses and one pair between the machine and the rear lens. Y

When the diaphragm 10 with its flange is applied interiorlyof the lens barrelof the machine these parts are arranged so that the slots 19 and 20 of the fiange'of the device willbe registeredwith one pair of the slots 21 and 21? of the lens barrel, as occasion requires, to allow a slide, or element, as 22, to be adjustably inserted through the re'gis-- tered slots of the lens barrel as well as through the .slots of the flange of the diaphragm for cutting out the marginal rays of light from the condenser atgthe rear of the device by causing the passage through the aperture 15 of the diaphragm to be contrast between the varied in dimension. The adjustable element, or slide 22 has a substantially rectagular body portion 23 of a length considerably longer than the width of the lens barrel of the machine, and through the body portion of the adjustable slide are spaced openings 24:, 25, 26 27. All of these openings are preferably approximately rectangular to conform to the usual shape of thepictures of a film. These openings of the slide vary in sizes, the opening 24 being the smallest, the opening 25 being larger, the opening 26 being still larger, and the opening 27 being the largest. The openings are provided in the slide as well as being relatively arranged so that when the body of the slide is according'y adjusted in the lens barrel of the macline and also adjusted inthe guides 17 and 18 of the diaphragm of the device one of the openings of the slide may be registered with t e aperture 15 of the diaphragm, and to permit the slide to be conveniently moved projecting from the ends of its body portion 23 are handles, as 28 and 29.

When the pictures from a moving picture film are projected on a screen positioned at a comparatively short distance from the projecting machine, the slide is adjusted so that its opening 24 will be in register with the aperture 15 of the diaphragmof the device as well as bein in the optical axes of the lenses of the mac ine, and when the projection of the pictures is for a longer distance the slide is adjusted so that its opening 25 will bein register with the aperture of the diaphragm 10. When the throw of the pictures is for still longer distances. the slide is adjusted in a like manner so that its apertures 26 and 27 will be respectively in register with the aperture of the diaphragm. By properly proportioning the dimensions of these openings according to the variations of distances of the screen from the projecting machine only such of the direct rays of light operative through the condenser or condensers will be admitted through the passa e of each opening as will evenly illuminate the pictures appearing on the screen as well as producing a pronounced high lights and shadows of the objects in. the pictures.

While this use of the slide 22 will cause a portion of the marginal rays of the light to be cut-out, the angularly directed rays may be partially used in instances by providing a reflector, as 28. The reflector may be in the form of a mirror mounted on the inner surface of the flange 16 of the diaphragm of the device, or the reflector may be provided by making this flange of metal with a highly polished or silvered inner surface. The angularly directed rays of the light 0" erative through the condenser at the rear of the device will be received in the reflector for being deflected so as to merge with the direct rays of the li ht for projection through the slide of the evice, and in this manner these rays will be advantageously bodied the preferred form of my invention,

but I do not wish to be understood as limiting myself thereto, as I am-aware that modifications may be made therein without departing from the principle, or sacrificing any 'of the advantages of this invention, therefore I reserve to myself the right to make such changes as fairly fall within the sco e thereof.

aving thus described my invention, I claim as new and desire to secure by Letters Patent 1. The combination with a lens barrel having a lens removably secured within one end thereof by means of a bushing having 'aninternal configuration similar-to the internal configuration of the barrel inwardly of the bushing and having pairs of registered side slots transversely therethrough forwardly of and rearwardly of said lens, of an apertured diaphragm removably positionable within the barrel at a point 1nwardly of the lens or within the securing bushing at the outer side of lens, and a slide adjustable on the diaphragm through the slots of the lens barrel and having a plurality of spaced apertures of varying size for being separately registered wit the aperture of the diaphragm whereby the passage through the'diaphragm may be varied in dimension.

2. The combination with a lens barrel having a lens removably secured within one end thereof by means of a bushing having an internal configuration similar to the internal configuration of the barrel inwardly of the bushing and having pairs of registered side slots transversely therethrough forwardly of and rearwardly of said lens, of an apertured diaphragm removably positionable within the barrel at a point inwardly of the lens or within the securing bushing at the outer side of the lens, a sii 1e adjustable on the diaphragm through the slots of the lens barrel and having a plurality of spaced apertures of varying size for being separately registered with the aperture of the diaphragm whereby the passage through the diaphragm may be varied in dimension, and a reflector on the diaphragm for deflecting angularly directed rays.

3. The combination with a lens barrel having a lens removably secured within one end thereof by means of a bushing having an internal configuration similar to the internal configuratmn of the barrel inwardly of the bushing'and having pairs of registered side slots transversely therethrough the slots of the lensbarrel and having a plurality of spaced apertures of v varying size for being separately registered with the aperture of the diaphragm whereby the passage through the diaphragm may be varied in dimension, said diaphragm having a marginal flange provided with slots for registration with the slots of the lens barrel.

4. The combination with a lens barrel having a lens 'removably secured within one end thereof by means of a bushing having an internal configuration similar to the internal configuration of the barrel inwardly of the bushing and having pairs of registered side slots transversely therethrough forwardly of and rearwardly of said lens, of an apertured diaphragm removably positionable within the barrel at a point inwardly of the lens or within the securing bushing at the outer side of the lens, a slide adjustable on the diaphragm through the slots of the lens barrel and having a plurality of spaced apertures of varying size for being separately registered with the aperture of the diaphragm whereby the passage through the diaphragm may be varied in dimension, said diaphragm having a marginal flange provided with slots for regstration-with the slots of the lens barrel, and said marginal flange having a reflecting inner surface so as to deflect angularly directed rays of light.

5. The combination with a lens barrel having a pair'of spaced lenses removably secured Within the ends thereof by means of bushings having internal configurations similar to the internal configuration of the barrel between the lenses and having pairs of registered side slots transversely therethrough between ,the lenses and outwardly. of one of the lenses, of an apertured diaphragm removably, positionable within the barrel at a point between the lenses or within the securing bushings at the outer side of either of the'lenses, and a slide adjustable on the diaphragm through the slots of the lens barrel and having a plurality of spaced apertures of varying sizes for being separately registered with the aperture of the diaphragm whereby the passage through the diaphragm may be varied in dimension.

This specification signed I and witnessed this 22 day of March, A. D. 1919.

I FREDERICK w. nocusnarrm. VVitnessr FREDERICK CBYER.

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