GB616273A - Improvements in production of stereoscopic images - Google Patents

Abstract

616,273. Television. SCOPHONY, Ltd. Nov. 12, 1945, No. 30247. Convention date, Nov. 17, 1944. [Class 40 (iii)] [Also in Group XX] Left and right eye stereoscopic images are produced successively, the light from successive images being circularly polarised in opposite directions. In the television receiver shown in Fig. 3, the images appear successively on the screen of the cathode-ray tube 20 and are projected on to the screen 29 by a lens 30. Oppositely circularly polarising screens are moved successively into the light path in synchronism with the image change, being mounted in a rotating disc 21. The projected pictures are viewed through spectacles with oppositely circularly polarising filters. For stereoscopic colour television a sequence of combinations of colour and polarising filters is used, corresponding to the projected sequence of red, green and blue colour components of left and right eye images. In a television transmitter suitable for such a system a shutter disc 15, Fig. 2, has three opaque sectors alternating with colour filters 18B, 18R, 18G. The disc is disposed in front of mirrors 12L, 12R spaced to correspond to the right and left eye viewpoints and inclined at 45 degrees to the viewing direction. Further inclined mirrors and a lens project the colour component images from two viewpoints on to the sensitive surface of the camera pick-up device. For black and white projection the colour filters are omitted. Alternatively the left and right eye pictures may be received side by side on the sensitive surface, or on separate pick-up devices, and scanned alternately. Specifications 486,111, and 519,488, [both in Group XX], are referred to.