Improvements in or relating to photographic film cameras or optical film projectors comprising a mirror objective

摘要

710,549. Photographic cameras and optical projectors. NAAMLOOZE VENNOOTSCHAP OPTISCHE INDUSTRIE DE OUDE DELFT. Aug. 5, 1952 [Aug. 16, 1951], No. 19725/52. Classes 97(1) and 98(1) In a camera or projector for still or moving pictures with an objective consisting of a spherical concave mirror 2 and a correcting member 3 with an auxiliary mirror 4 facing the mirror 2 the film 6 is led to and from the film support 5 through a central aperture 8 in the mirror 2. The member 3 may be a Schmidt plate or a meniscus lens as described in Specifications 637,645 and 638,975 in which case the mirror 4, which may be plane or slightly curved, may be formed by grinding, polishing and silvering part of its convex surface. The film support 5 and the spools 7, 11 may form part of a detachable magazine. Specification 303,431, [Class 98(1)], also is referred to.