Patent GB-421120-A (GB)
Title: Method and apparatus for the production of motion pictures
IPC: G03B33/14
Filed: 1933-05-10
Abstract: 421,120. Kinematography. DVORNIK, A., 24, Mandroviceva, Zagreb, Jugo-Slavia. May 10, 1933, No. 13591. Convention date, Oct. 12, 1932. [Classes 97 (i) and 98 (ii)] A lenticular screen, having circular elements and carrying a sensitive emulsion, is exposed to light from one or more lens apertures to produce a point image or images behind each lenticular element of the screen, and relative movement is effected between the lens aperture and the lenticular screen to displace the image in the field of each element and produce a kinematographic image record ; the records, which may be colour records or stereoscopic, may be projected or exhibited by means of a light source behind the image layer, or by a light source in place of each lens aperture, relative movement between the light source and lens screen being produced, and copying may be effected by projection of the whole record simultaneously on to a similar lens screen carrying a sensitive emulsion. As shown in Fig. 1, a plate 4 with an aperture 5 is moved intermittently, or continuously and without the use of a shutter, in its own plane between a lens 1 and a lenticular screen 2 carrying an emulsion layer 3. The aperture may be moved in such manner as to produce a spiral series of image points behind each element of the screen, as shown in Fig. 2<a>, or may be moved in any other manner so as to scan the whole surface of the lens 1. Alternatively, the aperture may remain stationary, the lenticular screen being moved, or both the aperture and screen may be moved in transverse directions. The aperture may be round, triangular, polygonal, slit-shaped &c. and may contain three colour filters to produce colourrecords ; the colour filters may be placed between the lens and the lenticular screen, or may be replaced by a screen between the lenticular screen and the emulsion as in starchgrain colour screen plates. The lenticular screen may consist of a glass plate, a plate or strip of celluloid, or of two or more layers of glass and /or celluloid secured together, and may be flat or concave towards the lens 1 ; the lenticular elements may be spherical or aspherical. The plate 4 may contain a plurality of apertures 5, and the lens 1 may consist of a sector of a large lens which is rotated with the aperture. Alternatively, the aperture plate 4 may be dispensed with, and a small lens which may be itself moved, may be used. When the lens or its aperture is stationary, the screen may perform such a combination of oscillatory movements that the line normal to it at its centre may make conical movements about the lens 1. The exposed image may be developed as a positive, and projection may be effected by a light source behind the image, the lens or its aperture being moved in the same relative manner as during the exposure or in other manner. The image may, alternatively, be viewed on a screen placed behind the image layer at a distance approximating to the focal length of the lenticular elements, illumination being effected by a lamp moving in a similar manner to the lens of the camera. For stereoscopic images, two camera lenses and two lenticular screens may be used, and the two lenses may also be used for viewing the images ; the lenses may be provided with colour screens. Image records in accordance with the invention may be photographed from an existing series of kinematograph images of normal type.