Same reason, just like Belin and Holweck who used Cathode rays for The Frenchman RignouxĪnd the Russian Rosing experimented also with the Braun's tube for the The first ideas of using Cathode rays (Braun's tube) for Television cameįrom the Scotsman Campbell Swinton in 1908. Harris J Ryan introduced a similar tube in 1903 in the USA as anĪlternating current wave indicator, known as the Braun-Ryan tube. This tube, build for him by Franz Müller, successor of Geissler was calledīraun used this tube as an indicator tube to visualize alternating currentsĪnd described this in 1897, it was in fact the first oscilloscope. Screen covered with phosphor to produce a visible spot. With magnetically beam deflection.He used a diaphragm and a mica University (from 1895-1918) developed the first cold Cathode Ray tube Produced the first domestic TV sets for the Japanese market.Ī German physicist working at the Physics Institute of the Strasbourg In 1937 to 441 lines competing with the rest of the world, in 1939 Nippon Electric Company In 1936 he presented a 30 Hz 245 lines interlaced all electronic television system. Were used with 40 lines flyingspot scan techniques, the camera tubes were not yet developed. Asao at the research Institute of Tokyo Shibura Electric Company. He started the production of high vacuum CRT's in 1930 built byĭr. In Japan Kenjiro Takayanagi at the Hamamatsu Higher Technical Institute worked on CRT In the deflection amplifier circuits for tubes with large screen sizes. This could be done by placing the gun under an angle pointing towards the side of the tube.įor TV use, magnetically deflecting won over statically deflection due to the high tensions needed There were tubes produced by DuMont with only one deflection plate, Own CRT's and started CRT production in 1931 in his garage mainly for oscilloscopes, Receivers, this CRT's were called Oscillite which never became successful like the RCA tubes.Īnother important player on the US CRT market was Allen B Dumont who developed his RCA made large progress in developingĭifferent and better tubes for TV, radar and oscilloscopes.įarnsworth television also produced for a short period low vacuum tubes for his television Important role in the electronic TV development, he eventual became director of RCA, in thoseĭays the leading CRT producing company in the US. The CRT Kinescope, it was used with 60 lines at 12 frames per second. Vladimir Kosma Zworykin demonstrated this tube in the first RCA TV receiver in 1929 and named The first US commercial available high vacuum CRT developed by Zworykin, at that time workingįor Westinghouse (part of RCA) was the high vacuum RCA 906. In these low vacuum tubes theįocus of the beam was regulated by controlling the heater current like the Western 224. The first used CRT's were the low pressure argon filled tubes. In the US General Electric, The Bell laboratories, National Union, Westinghouse, RCA Victor,įarnsworth Television, and Dumont developed their pre-War CRT's. Had also long reputations in early science vacuum tube technology. Some of them were closely connected to RCA or the Farnsworth company. Gladitz GmbH, Fernseh AG, Radio AG, D.S.Loewe, Baird Television, Marconi-EMI and Cossor. Leybold & Von Ardenne, Emil Gundelach, Philips, Lorenz AG, Telefunken AG, Otto Pressler, In Europe there were several companies active with the early CRT techniques like, DuMont Division of Fairchild.The beginning of the CRT Century which would last more than 100 Years! The cathode-ray tube division was sold to Fairchild Camera and Instrument in 1960, creating the A. The DuMont Laboratories produced high-quality televisions until 1958, when it sold the consumer products division to Emerson. The Dumont network grew to 200 stations and was sold to Metromedia in 1956. In 1946 he established the DuMont TV Network with stations WABD (New York) and WTTG (Washington, DC). He is also known for developing the modern laboratory ocilloscope.ĭuMont was a member of the National Television Standards Committee (NTSC). In 1937 DuMont began manufacturing the first all-electronic, commercial television receivers, which were based upon his improved cathode-ray tube. The US military asked him to keep it secret. In 1933, he invented an early form of radar, which he did not patent. In 1932, DuMont invented the "Magic Eye" cathode ray tube and sold rights to RCA. DuMont founded his company in 1931 in Montclair, New Jersey. After supervising tube production at Westinghouse from 1924, Allen B.
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