GB661951A - Method of photography employing lenticular screens - Google Patents

Abstract

661,951. Multiple photographs; lenticular screen photography. RELIEPHOTOGRAPHIE SOC. POUR L'EXPLOITATION DES PROCEDES DE PHOTOGRAPHIE EN RELIEF M. BONNET. Nov. 6, 1945 [March 31, 1944; Aug. 10, 1944], Nos. 29577/45 and 29578/45. Drawings to Specification. Classes 98 (i) and 98 (ii). A method of photography employing a lenticular screen for recording on a single negative, by means of an objective of smaller aperture than the elements of the screen, a number of independent separate images and/or the subsequent printing of said separate images, is characterized in that the successive recording or subsequent printing of these different images is achieved by altering the angle at which light strikes the lenticular screen during recording or the angle at which it leaves the screen during printing. If spherically lenticulated screens are used, the screen and associated light-sensitive surface are caused to pivot about two perpendicular axes parallel to the axes of the screen. Instead of spherically lenticulated screens, two crossed cylindrical screens of equal thickness, but the upper one of twice the focal length of the other, are superposed in contact. As an alternative to pivoting the lenticular screen and sensitive surface, the objective may be displaced in perpendicular directions parallel to the face of the screen. Contact prints of particular images may be obtained in an analogous manner by placing the image-bearing layer of the negative, which is on the opposite side of the support to the lenticular screen, and the emulsion layer of the printing material in contact, and placing a light source behind an aperture of the same size and at the same distance from the negative as the objective employed in photographing the original. In the case of projection printing using the taking lens system, if the projected image is formed inconveniently near to or distant from the negative, the image plane may be changed by using as necessary a simple negative or positive auxiliary projection lens. Oblique marginal rays encountered due to the use of a very small aperture objective system may be suitably presented to the lenticular screen by placing a converging lens against the screen. Specification 283,954, [Class 98 (ii)], 615,530, 619,948 and 638,551 are referred to. The Specification as open to inspection under Sect. 91 states that instead of pivoting the screen and the sensitive surface, the successive recordings or printings may be produced by relative transverse sliding movements between the screen and the sensitive surface. This subject-matter does not appear in the Specification as accepted.