GB426307A - Improvements in and relating to screens for kinematographic projections and the like - Google Patents

Abstract

426,307. Projection screens. DARIMONT, L., 266, Rue Adolphe Willemyns, Brussels. Sept. 21, 1934, No. 27203. [Class 97 (i)] The sheets of screens comprising several sheets of transparent material each have a multiplicity of spherical bosses and recesses close together on both sides so as to form lenses in the sheets or in the spaces between them; thin flat sheets of transparent or opaque glossy material, or non-glossy network, may be used in combination with them. Fig. 1 shows sheets 1 of cellulose acetate &c. and of uniform thickness, formed with bosses 2 and recesses 3 and arranged so that lenticular air spaces are formed. As shown in Fig. 2, lenses 7<1> are formed in the sheets, and the sheets are arranged to produce lenticular air spaces 7<11>. A thin glossy flat sheet 5 of cellulose acetate may be interposed between the sheets 1 ; one such sheet may be used in conjunction with each four of the sheets 1. An additional or alternative sheet 6, Fig. 4, made opaque or not, or with a metallized surface, may be provided at the back of the screen, and a non-glossy network 11 of cotton net, tulle, &c., preferably dead white in colour, may be provided at its front. A second network, preferably of smaller mesh than the network 11, may be arranged immediately in front of the sheet 5. Other combinations of sheets and networks are referred to, and the sheets and networks may be coloured in various ways. The sheets may be held in a frame 12.