GB782108A - Improvements in and relating to viewing devices for use with kinematographic, television and like stereoscopic picture presentation - Google Patents

Abstract

782,108. Stereoseopes. DEWHURST, H. Nov. 15, 1954 [Nov. 17, 1953, Feb 2, 1954], Nos. 31821/53 and 3034/54. Class 97(1) In a stereoscope for viewing stereo-pairs arranged vertically one above the other in the form of a projected image or a television picture, an optical means is provided for each eye of a viewer and the means are mechanically coupled together to be simultaneously adjustable, equally in opposite directions, to vary the direction in which each eye of a viewer looks so as to fuse the images. In one form, one pair of relatively rotatable prisms is mounted before each eye, form, one pair of relatively rotatable prisms is mounted before each eye, the apical edges of one pair of prisms being capable of being directed upwards and the edges of the other pair being simultaneously directed downwards. In another form, Fig. 1A, one prism 6 is mounted in one eye-piece of a spectacle or lorgnette frame and another 7 in the other eye-piece and the prisms are oppositely directed and coupled by piano wires 10 for contra-rotation. Other forms of wire coupling are described. The prisms 6, 7 may each be mounted in a gear ring and forms of gear coupling are described. As shown in Fig. 2B, the eye-pieces 3 of a pair of spectacle binoculars are mounted on a lever 4 pivoted at 5 so that they can be moved vertically in opposite directions. Alternatively, the objectives may be similarly mounted, or, rotating prisms may be incorporated into spectacle binoculars. In another form, Fig. 3A, two movable mirrors 5, 6 are mounted in a box 1 independently supported in front of the viewer. The mirrors are coupled by gear wheels 10, 11 and the axes of rotation are spaced apart so that a single mirror 4 of a width reduced to that corresponding to one mirror 5 or 6 can be used. Objective lenses and eye-pieces may be placed before and behind mirrors 4, 5 and 6 respectively. Masking devices may be employed in all embodiments to remove the unwanted images and may, in one form, be automatically variable in size by mechanism (not particularly described) coupled to the rotating mirrors of Figs. 3A. Alternatively, the unwanted images may be removed by polarizing screens 10. 14, Figs. 2B, 3A or analglyphically by colour filters. Specifications 332,207 [Class 97(i)] and 649,777 are referred to.