Rotation-free electrical focussing circuit for television image

Details Rotation-free electrical focussing circuit for television image Rotation-free electrical focussing circuit for television image

1981-12-24

1984-07-10

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358227, 358218, 315370, 315386, H04N 534

Patent

active

044596146

ABSTRACT:
Vertical-rate and horizontal-rate sawtooth generators are coupled at a common input to a conventional focus control voltage and then to the centering circuits of an image tube via respective potentiometers. The amplitudes and polarities of the generator outputs are selected such that when driven simultaneously by the electrical focus control voltage supplied to an image tube, generates an image rotation which just cancels any image rotational error inherently induced by an electrical focus adjustment.

REFERENCES:
patent: 2901661 (1959-08-01), Neuhauser
patent: 3647952 (1972-03-01), Ball
patent: 3710018 (1973-01-01), Ryley

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