CRT with means for monitoring electron beam

Details CRT with means for monitoring electron beam CRT with means for monitoring electron beam

1988-02-02

1989-05-02

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313475, 313478, 313479, 358901, H01J 2988, H01J 2989

Patent

active

048271837

ABSTRACT:
A cathode ray tube useful as a transducer for converting electrical signal information into a visual pattern on a recording medium uses a cylindrical envelope along which a signal modulated beam is projected. A fiber optics plate is positioned along the sidewall of the envelope and the beam is swept in a liner scan of the fiber optics plate by an array of electromagnets, positioned along the envelope and properly excited to deflect the beam appropriately. For monitoring the properties of the electron beam, the inner surface of the end plate of the envelope is provided with a patterned coating of luminescent material on which the electron beam is incident when undeflected by the array of electromagnets. Sensors are provided for measuring the flux distribution for monitoring the properties of the electron beam.

REFERENCES:
patent: 2244748 (1941-06-01), Walker
patent: 2657257 (1953-10-01), Lesti
patent: 2880341 (1959-03-01), Aiken et al.
patent: 2975230 (1961-03-01), Schlesinger
patent: 3609233 (1971-09-01), Nagao
patent: 3668387 (1972-06-01), Johnson
patent: 3715617 (1973-02-01), Tilton et al.

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