GB518069A - Optical device for obtaining several simultaneous pictures without parallax - Google Patents

Abstract

518,069. Optical systems. CAVIONI, J. June 10, 1938, No. 17311. Convention date, July 20, 1937. [Class 97 (i)] A system for taking simultaneously without - parallax colour-component images of an object comprises in combination an objective a which forms an image of the object on the plane surface of a plano-convex lens b the focal length of which is substantially equal to that of the objective and the plane surface of which faces the objective and is in a plane perpendicular to the axis thereof, a group of prisms d juxtaposed round the axis of said lens, a secondary objective f associated with each prism, and filters of different colours located one in the field of each secondary objective, either in front of or behind such objective. The component images formed by the secondary objectives f are received in juxtaposition on the sensitive film g. Marginal rays are cut off by a diaphragm c. The Specification as open to inspection under Sect. 91 refers also to (1) a projection apparatus in which the above system is inverted and the images are projected in superimposition on a screen either through colour filters or after being themselves coloured and (2) the printing of an enlarged positive of standard size comprising superimposed monochromes, and it also refers vaguely to projection of this positive by using a colour-band filter at the projection objective, and in front of the filter " a series of stick prisms, a crinkled film, or a weft of threads of variable arrangement and coupling "which may be metallic and may be produced by printing or by photography, Figs. 4-6 (Cancelled), not shown. This subject matter does not appear in the Specification as accepted.