Method of adjusting the current intensity of an electron beam in

Details Method of adjusting the current intensity of an electron beam in Method of adjusting the current intensity of an electron beam in

1983-09-27

1986-06-03

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358217, 358223, H04N 5235

Patent

active

045933219

ABSTRACT:
In a television camera having at least one pickup tube, it is desirable to generate an electron beam with a current intensity which is greater than that necessary for obtaining a picture signal with a nominal amplitude between a black level and a white value. This prevents comet tails from being produced on the display behind brighter, moving scene portions. The electron beam intensity is adjusted by blanking the electron beam periodically during at least one field period and within the field period during at least a portion of a line period of a number of consecutive lines. The electron beam is properly set when the picture signal amplitude is observed to be maximum at a substantially minimum beam current intensity.

REFERENCES:
patent: 2402053 (1946-06-01), Kell
patent: 2700066 (1955-01-01), Vorms
patent: 4206480 (1980-06-01), Ushijima
patent: 4331980 (1982-05-01), Ryan
patent: 4365271 (1982-12-01), Blom
patent: 4503466 (1985-03-01), Ryan

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