GB597409A - Improvements in and relating to continuous feed kinematographic apparatus - Google Patents

Abstract

597,409. Kinematograph apparatus. MAYTUM, J. A., and SMITH, L. Feb. 23, 1945, No. 4636. Addition to 597,090. [Class 97 (i)] A continuous feed projector has duplicate light paths for illuminating successive portions of film and uses one or more square section compensating prisms enclosed, as in the parent Specification in a shutter or shutters which prevent light from falling on more than one face at a time. The projector may be modified for use as a camera. In the projector shown in Fig. 1, the film 6 is illuminated by a lamp 11 with condenser 12, and passes round a drum 14 with apertures between transverse bars for successive frames. Two prisms 9, with reflecting surfaces 10, are arranged, one above the other, to receive light from successive portions of film and to pass it through compcnsating prisms 21 enclosed in shutters 22 and through objectives 13. One compensating prism is 45 degrees in advance of the other. The light source may be placed within the drum 14, or the light may be reflected into the drum by a rhomboidal prism as shown in dotted lines. In the form shown in Fig. 4, the axes of the objectives 13, 19 are inclined at 45 degrees and intersect in a single common compensating prism 21. A single light source .11, with a reflecting prism 17, is provided, and two condensers 12, 18. The beam from the objective 19 is superimposed on the screen, with that from the objective 13, by a doubly reflecting prism 20 with a silvered surface at 23. The projector may be used for stereoscopic projection, the duplicate light paths being used for the left- and right-eye views, one being projected on to a main screen and the other on to a semi-transparent screen in front of it. The camera may be used for stereoscopic kinematography, taking left- and right-eye views alternately through the two objectives.