Patent GB-441151-A (GB)
Title: Improvements in or relating to television and like systems
IPC: H04N3/36
Filed: 1934-08-31
Abstract: 441,151. Television. FERNSEH AKT.-GES., Goerzallee, Zehlendorf, Berlin. Aug. 31, 1934, No. 25116. Convention date, Aug. 31, 1933. Addition to 428,227. [Class 40 (iii)] [See also Groups VIII and XX] Relates to a television or like system as described in the parent Specification in which an intermediate record which is scanned at a transmitter or projected upon a screen at a receiver is employed and in which a record carrier in the form of an endless band is used and is periodically re-emulsified by the application thereto of a light sensitive emulsion in liquid form. According to the invention, an intermediary layer of gelatinous material adapted to facilitate the removal of the light sensitive layer is coated upon the carrier as a basis for the coating of light sensitive material, this intermediary layer remaining on the carrier during the whole cycle of operations. The layer carrier mav be made of a suitable cellulose ester combined with a softening material, such as camphor, and the strength of the perforations therein may be increased by thickening the material in the neighbourhood thereof. Alternatively, only the centre portion of the film is used for the pictures as described in Specification 419,419 and broad perforations are provided. Fig. 1 shows a transmitting station at which an endless band of film 1 after being emulsified in the apparatus 2 is hardened and dried in a chamber 3 by means of an air blast, the fans supplying which are arranged to be noiseless. The film is then exposed cinematographically in the camera 4 and developed and fixed in suitably cooled tanks 5. The developed picture is then scanned by the apparatus 6 and the film passed to the cleaning apparatus 7 in which the emulsion is removed by warm solutions, such as lye, and rotary brushes. After being dried by warm air in the chamber 8, the film is once more emulsified at 2 and so on cyclically. Fig. 3 shows a construction of emulsion depositing apparatus comprising a storage vessel 3 connected by a tube 4 with a depositing vessel 1 ventilated by a light-proof tube 2, the whole being enclosed in a container maintained at a steady temperature by a heater 5 controlled by a thermostat 6. The film passes over an adjustable roller beneath the depositing nozzle which is suitably curved so as to maintain the distance between it and the film uniform over the width of the jet. The nozzle is also surrounded by a large mass of metal so as to prevent sudden alterations of temperature. The arrangement employed at the receiving station is similar to that shown in Fig. 1 but in this case instead of passing the film through the camera 4 it is exposed by scanning by light from an arc lamp modulated by means of a Kerr cell adjustable in all directions and after development the film is projected by suitable projecting apparatus. The apparatus may be so arranged that the cleaning and re-emulsifying portions thereof can be thrown out of action when a length of standard film may be subjected to the remaining processes of exposure, development, fixing and scanning or projection and a permanent record thus obtained.