Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1990-08-08
1992-07-14
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
313422, H01J 2970, H01J 2972
Patent
active
051306140
ABSTRACT:
A cathode ray tube apparatus uses a ribbon electron beam to illuminate one line of information at a time on the display surface of the tube. The resulting increase in scanning speed allows for a reduced beam current density and corresponding reduction in electrostatic spreading. The beam is focusable to a smaller spot which allows enhanced image resolution. Velocity filters enhance resolution in the plane of the ribbon beam. A linear modulation assembly allows the ribbon beam to be modulated prior to deflection, removing the need for a full modulation grid. Thin septa are provided to support the tube against compressive external forces. The septa are tapered near the display surface where septum electrodes draw electrons of the beam toward the septa near the display surface to prevent image discontinuity. Rapidly-varying high voltages are provided by an electron gun directed toward receiving anodes which absorb electron energy and transfer resulting voltages to storage circuits which service high voltage electrodes.
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Thin Cathode Ray Tubes by Masanori Watanabe vol. 29/3 1988.
Blum Theodore M.
Massachusetts Institute of Technology
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