Electric lamp and discharge devices: systems – Cathode ray tube circuits – Combined cathode ray tube and circuit element structure
Patent
1994-06-22
1996-07-09
Lee, Benny T.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Combined cathode ray tube and circuit element structure
315 393, 335210, 335306, H01J 23087
Patent
active
055347509
ABSTRACT:
A focusing system for an electron beam within an RF amplification tube is provided. The focusing system comprises a plurality of magnetic polepieces each having a centrally disposed aperture, and a plurality of electrically conductive non-magnetic plates alternatingly and integrally provided with the polepieces, the non-magnetic plates each having a centrally disposed aperture. The apertures of the polepieces are aligned with the apertures of the non-magnetic plates to provide a beam tunnel through which the electron beam travels. At least one permanent magnet is coupled to the polepieces, the magnet having magnetic flux which flows through the magnetic polepieces to provide an axial magnetic field within the beam tunnel. The diameter of the beam tunnel is selected to be greater than a separation distance between adjacent ones of said polepieces, and the axial magnetic field varies substantially across a cross section of the beam tunnel. The axial magnetic field has a greatest RMS value at an outermost portion of the beam tunnel.
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Lyon Douglas B.
Theiss Alan J.
Lee Benny T.
Litton Systems Inc.
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