Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Electron or ion beam deflecting type
Patent
1979-02-26
1981-02-17
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Electron or ion beam deflecting type
315 10, H01H
Patent
active
042517907
ABSTRACT:
A magnetic focusing/deflection system is disclosed for electron beam tubes, particularly camera tubes. The precessional motion occurring upon deflection of the beam which reduces the resolution toward the edge of the picture screen with increasing deflection angle is largely suppressed. The focusing-deflection system disclosed has a compact construction and has a deflection coil system provided for the beam deflection which is subdivided in such manner that a first set of deflection coils arranged on the beam source side and effecting the directional change of the beam emerging from the beam source and a second set of deflection coils arranged on the screen side and adapting the focusing field to the linearly extended beam direction of the beam emerging from the field of the first deflection coil pair are provided. A focusing coil is also provided which is spatially arranged completely on or largely superimposed on the second set of deflection coils.
REFERENCES:
patent: 3774070 (1973-11-01), Swart
Proceedings of the I.R.E. "Electron Optics of Cylindrical Electric & Magnetic Fields" Jan., 1940-Albert Rose.
Proceedings of the I.R.E. "The Motion of Electrons Subject to Forces Tranverse to a Uniform Magnetic Field" Nov. 1947-Weimer & Rose.
RCA Review, "Electron Optics and Signal Readouts of High-Definition Return-Beam Vidicon Cameras" Mar. 1970-Ottoh. Schade, Sr.
"Handbook of Wireless Communications Technology" vol. 5, Television Technology, first part "Basics of Electronic TV" Berlin-Gott.-Heidelberg, 1956, pp. 582-612.
Broome Harold
Siemens Aktiengesellschaft
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