GB497691A - Stereoscopic television - Google Patents

Abstract

497,691. Television. CLAY, R. S. July 27, 1937, No. 20733. [Classes 39 (i) and 40 (iii)] In a receiver of stereoscopic television a ruled screen JK in front of the picture screen GH has the same curvature as the picture screen, Fig. 4 (not shown), and mirrors 81 S2, T1 T2 deflect light to observers L4 R4, R5 L5 to the left and right of direct observers L R, L2 R2, L3 R3. The position of the scanning lines of the two images is so adjusted by variation of the scanning potential that the geometrical conditions necessary for the position of the observer are fulfilled. The position of the ruled screen parallel to the picture screen and the distance apart of the two screens are also adjusted to satisfy the conditions. The mirrors are above and below the beam to the direct observer, and are at such angles that scanning lines on the picture screen for the right eye are reflected to the observer's right eye and those for the left eye are reflected to the left eye. When plane screens are used, the picture screen may be a mica screen coated with fluorescent material in a cathode-ray tube, or the end of the 'tube may be a thick sheet of plate glass.