Patent GB-437068-A (GB)
Title: Improvements in projection printing apparatus for kinematograph films
IPC: G03B15/08
Filed: 1934-10-17
Abstract: 437,068. Photographic projection-printing apparatus; kinematograph apparatus. PARAMOUNT PRODUCTIONS, Inc., 5451, Marathon Street, Hollywood, California, U.S.A. Oct. 17, 1934, No. 29751. Convention date, Aug. 13. [Classes 97 (i), 98 (i), and 98 (ii)] Projection-printing apparatus for kinematograph films comprises in combination a projector, a projection screen, a camera adapted to photograph the image on the screen, and a swinging carriage for the camera movable relatively to the projection screen on an axis lying substantially in the plane of the projection screen. As shown, the projector P is longitudinally adjustable on rails 12, vertically adjustable by screw-and-nut mechanism operated by the handle 36, and transversely adjustable by screw-and-nut mechanism operated by the handle 48. Light from a horizontally and vertically adjustable lamphouse 55 is reflected through the film by a mirror. The projection screen and camera carriage 65 slides longitudinally on rails 12. Sliding in vertical guideways in the standards 103 mounted on a platform 98 adjustable transversely to the carriage 65 is a frame 130 having sockets carrying forwardly and rearwardly projecting rods 133, 134. Secured to the rods 133 is a ring 139 in which the projection screen structure can rotate as a whole. The projection screen S which comprises two glass sheets separated by a thin membrane, is movable horizontally and vertically on a rectangular frame which can pivot in the ring 139 about alternative central and eccentric axes. Frames 180 mounted on rods 133 carry auxiliary screens, and another screen carrying foreground scenes may be mounted on the ends of rods 133. Frame 190 mounted on rods 134 carries screens for producing out-of-focus effects. The camera C is pivoted to a plate 211 adjustable longitudinally and transversely of the platform 230. The swinging carrier 231 is rotatable in the plane of the screen S on a pivot 248. Secured to the platform 230 is a casing 250 pivoted to a member 104 and carrying a counterbalance arm 255. The projector P and camera C are driven by an electric motor 270 driving through a gear-box 273 a shaft 275 driving a shaft 217 provided with a keyway 280 through a friction clutch 276. The gear housing 302 slides along shaft 277 as the carriage 65 moves along the rails 12. The camera C is driven from the shaft 277 by means incorporating a friction clutch, reversing mechanism, and stop means to enable the film to be fed for one frame length only. The projector P is provided with similar mechanism driven by shaft 461. In an alternative camera mounting the camera can be rotated about the longitudinal axis of the lens while in operation. Methods of using the apparatus to obtain a book-leaf effect, a fadeout effect in which the two sides of the picture gradually move out of focus, and an effect in which the scene turns on an axis perpendicular to its plane, and to add foreground components with or without taking a panning shot of the projected scene, and to changeover from one scene to the next by panning from the screen to a lateral painting and back from a second lateral painting to the next scene are described.