GB315308A - Improvements in electro-optical transmission systems - Google Patents

Abstract

315,308. Electrical Research Products, Inc., (Assignees of Ives, H. E.). July 11, 1928, [Convention date]. Television.-A television system comprises a plurality of channel-terminating means for a corresponding number of transmission channels 61, 62, 63, and a moving member, such as a rotating disc 31 carrying groups of scanning- elements, some at least of which are refracting prisms, for deflecting incident light beams, and each group co-operates with one only of the channels. As shown, three channels are used, and the prisms 1<a>, 2b, 3c are arranged in spiral apertures in the disc in such a way that the light beams from an object 10 incident on successive apertures are deflected to light-sensitive cells 41a, 42<b>, 42c in rotation and that light falls on each cell continuously. The elements of the object transmitted over the different channels are thus interspersed. Analogous apparatus is used at a receiver 80. According to modifications : a large multiple-element glow lamp, as described in Specification 293,308, is used at the receiver (Fig. 6, not shown); a photographic record of the object is made and then scanned (Fig. 7, not shown), and a similar apparatus used at the receiver (Fig. 8, not shown); the photographic record is moved steadily and scanned by prisms in apertures arranged in a circle in the scanning-disc (Fig. 9, not shown). The Specification as open to inspection under Sect. 91 (3) (a) comprises also reflecting prisms as scanning elements. This subject-matter does not appear in the Specification as accepted.