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"2-4-4- ATTORNEY Patented July 23, 1946 2,404,366

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July 23, 1946. C, H, DUFFY 2,404,366 MASKING ATTACHMENT FOR PHOTOGRAPHIC CAMERAS Filed Sept. 1, 1944 NVENTOR Chaetes /70/GA Awaay "2-4-4- ATTORNEY Patented July 23, 1946 2,404,366 UNITED STATES PATENT OFFICE 2,404,366 MASKING ATTACMENT FOR, ROTC GRAPEC CAMERAS Charles Hugh Duffy, Miami, Fla, Application September 1, 1944, Seria No. 552,330 5 Cairns. (C. 95-36) (Granted under the act of March 3, 1883, as amended April 30, 1928; 370. O. G. 757) 1. 2 The invention described herein may be manu element on. Such centering device to insure. that, factured and used by or for the Government of the lens is masked and unmasked on a, line pass-, the United States for governmental purposes ing. Substantially through the center of the lens, Without the payment to me of any royalty thereon and in the novel means for effecting an Opera-. in accordance with the provisions of the act of tive attachment of the mask centering means to April 30, 1928. (Ch. 460, 45 Stat. L. 467). lens barrels of different diameters. This invention relates. to photography, and par Referring to the accompanying drawing: ticularly to masking attachments for camera, Figure 1 is a front elevation of the lens mask lenses. ing device shown centered in Operative position It is known that when a portion of a camera, 10 On a lens. barrel and lens and illustrating the lens is properly masked, a portion of the camera, lens mask, in full lines in One nasking position film or plate will not be exposed when light is and in dotted lines in its other masking position. permitted to pass through the lens, the extent Figure 2 is a real: elevation of the same, with of such unexposed portion of the film or plate masking element removed. depending upon the manner and extent of the 5 Figure 3 is a Vertical sectional view, and masking of the lens. Various lens masking de Figure 4 is a perspective view of the centering. vices have been employed for the purpose of pre device. venting exposure of a certain portion or portions Like numerals, of reference, indicate the same of the camera, film or plate upon normal exposure parts throughout the several figures, in which: operation of the lens shutter. 20 indicates the lens and 2 the lens barrel of a Specifically, it is known that if a camera lens camera, supplied with the usual exposure shutter, is properly masked on a vertical or horizontal not shown. line which passes through the lens, so that Sub The masking attachment 3 includes the base stantially one half of the lens is completely plate 4, which is preferably a thin metal stamp masked, substantially one half of the camera film 25 or plate will be exposed upon normal exposure ing or plastic molding having its top portion 5 operation of the lens shutter, and that if the cut away to form a V. The sides 6 and 7 of the mask is then arranged to substantially mask the base plate 4 are preferably parallel and are each other half of the lens, that half of the camera, provided with a small tang which is formed out film or plate which was not so exposed will be 30. Wardly from the flat surface of the base plate to exposed upon a subsequent exposure operation provide stops 8 and 9. of the camera, shutter, while that half of the The material immediately adjacent the cut camera film or plate which was first exposed will away portion forming the W 5 is bent rearwardly not be again exposed upon such subsequent, ex from the front surface of the base plate 4 to posure Operation of the camera, Shutter. 35 provide a narrow flange 0, which, if desired may By Such masking of first One half of a camera, he Surfaced with thin felt if for engagement with lens and then masking the other half, the Can the lens barrel 2 to prevent marring the same. era film or plate is subjected to two independent Directly under and in vertical line. With the exposures which may be of the same or of differ apex 5' of the V 5 is a pin 2 which extends ent subjects, and if the masking is properly done, 40 through and to both sides of the base plate. 4 and the times of exposures and light conditions are and is rigidly secured in position in any approved uniform, the two exposures blend together on the lane. negative so produced as not to indicate to the The form and arrangement of the base plate observer that the same was made by two expo 4 and its pin f2 as iust, described is best shown. Sures, unless, of course, the camera was moved 45 in Figure 4. between the first and second exposures. Referring to the masking element 3 of the It is the purpose of this invention to provide device, it will be seen from Figure 1 that the a simple and inexpensive camera, lens masking sides 4 and 5 thereof are formed on lines ra device for ready attachment to the barrel of a diating. from the pira f2 considered as the center camera, ens, whereby Substantially each half of 50 of a circle of which said sides. 4. and 5. are radii the camera lens may be successively masked and and cf. Which the Outer edge 46 is an arc. The unmasked, and the invention consists in the inner part of the masking element 3 terminates means for automatically centering the attach in a nearly circular portion 7 having therein a ment On the lens barrel; in the novel construc perforation to receive the pin f2, about which pin tion and arrangement of the pivoted masking 55 f2, the masking element 3 pivotally swings from 2,404,366 3 4. the position shown in full lines to the position the exposure, which results in exposing substan shown in dotted lines in Figure i. tially one half of the camera film or plate. The The masking element 3 is retained on the pin. masking element is then swung over into position 2 in any approved manner as by upsetting the shown in dotted lines in Figure 1, and the subject end of the pin, and a thin Spacing Washer 8 or subjects to be photographed are moved past may be interposed on the pin f2 between the the center line of the camera, to a position in masking element 3 and the base plate 4 as front of the now unmasked half of the camera shown in Figures 3 and 4, to prevent rubbing lens which was just previously masked. While in contact between the masking element f3 and its this position the camera shutter is again operated centering device 4. O to effect the second exposure, which results in ex When the parts are thus assembled as de posing substantially the other half of the camera Scribed, the Swing of the masking element is film or plate, and also results in masking sub limited by the stops 8 and 9 on the base plate Stantially that half of the camera film which was 4, so that when the masking element 3 is in exposed by the first exposure, so that no substan position shown in full lines in Figure 1 and the 5 tial part of the camera film or plate is Subjected side edge 5 thereof is engaged by the stop 8, its to a double exposure, but a blending together of Opposite side edge f4 is positioned in a plane the two exposures is effected. If the period of passing Substantially through the center of the the two exposures are uniform and they are made lens , while when the masking element 3 is in One closely following the other so that the light position shown in dotted lines in Figure 1 and the 20 Conditions are the same for both, no discernible side edge 4 thereof is engaged by the stop 9, line of juncture of the two exposures will appear its opposite side edge 5 is positioned in substan On the negative nor on the prints made there tially the same Said plane passing through the fron. Center of the lens . The result is that when the In cases where the operator desires to photo masking element 3 is in position shown in full 25 graph himself in two different positions on the lines in Figure 1. Substantially, one half of the Same negative, the masking attachment is par lens is masked, while when the masking ele ticularly adapted for use on cameras equipped ment 3 is in position shown in dotted lines in With delayed action shutters. Figure 1 substantially, the other one half of the It has been my purpose to reduce the masking lens f is masked, the masking in each case ex 30 attachment to its simplest form, and at the same tending from a line passing substantially through time produce the most efficient device possible. the center of the lens . It will be clearly apparent that no skill nor pre Referring now to Figure 2, it will be seen that a Vious experience is necessary for effecting the curved leaf spring 9 is pivoted on the pin f2 on attachment of the device in proper operative po the inner side of the base plate 4 in the same 35 Sition to the lens barrel, since it is self centering manner as the masking element 3 is pivoted on and cannot possibly be attached thereto in an off Said pin on the outer face of the base plate 4, Center position.
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