Dynamic beam current control

Details Dynamic beam current control Dynamic beam current control

1980-05-23

1981-12-15

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 534

Patent

active

043062512

ABSTRACT:
A dynamic beam current control circuit for a television camera tube features a threshold circuit so that the correction is effected only for large light intensities impinging on the television camera tube. It also features a non-linear circuit which has a characteristic which is in the inverse of the control electrode voltage versus beam current characteristic of the camera tube. This prevents a ghost effect from showing in the display picture.

REFERENCES:
patent: 3102924 (1963-09-01), Legler
patent: 3999011 (1976-12-01), Sato et al.
patent: 4160277 (1979-07-01), Worsfold

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