Ribbon beam cathode ray tube

Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits

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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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patent: 4927218 (1990-05-01), Zegers
Thin Cathode Ray Tubes by Masanori Watanabe vol. 29/3 1988.

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