A Very High-Speed Facsimile Recorder

An operating facsimile system is described which is capable of transmitting black and white graphic information at the rate of 24 inches of copy feed per second. The system uses conventional line-by-line sequential scanning at the transmitter and a multistylus recorder with 100 lines per inch resolution at the receiver. The electrolytic recording medium employed is characterized by a relatively low internal impedance, which permits close spacing of the stylus electrodes and the use of direct-coupled transistors for the individual marking amplifiers. The high transmission speed results from the use of individual stylus electrodes for each elemental area along the scanning line and the holding of the video marking signal at each stylus for time intervals approximating the duration of a complete scanning line. The system described uses a 100-stylus block assembly, restricting the length of the scanning line to one inch. One thousand-stylus block assemblies have been made and these will permit reproduction of copy 10 inches wide.