Sensing focus of a color kinescope

Details Sensing focus of a color kinescope Sensing focus of a color kinescope

1980-12-31

1983-06-07

Britton, Howard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

315 10, 315382, 358 10, 358218, H04N 962, H04N 702

Patent

active

043873944

ABSTRACT:
An apparatus for sensing electron beam focus on the display screen of a kinescope comprises a photodiode adapted to detect the light output from an area on the kinescope display screen. A signal having a frequency equal to the scanned excitation rate of the individual screen phosphor element areas being excited by a deflected electron beam is developed from the photodiode output. The variation in the amplitude of this signal is an indication of electron beam focus condition.

REFERENCES:
patent: 2556455 (1951-06-01), Szegho
patent: 2571306 (1951-10-01), Szegho
patent: 2978646 (1961-04-01), Shumard
patent: 3356792 (1967-12-01), Peters
patent: 3647952 (1972-03-01), Ball
patent: 3699251 (1972-10-01), McKechnie
patent: 3710018 (1973-01-01), Ryley
patent: 3728482 (1973-04-01), Wren
patent: 3875585 (1975-04-01), Burrus
patent: 3949166 (1976-04-01), Fuse
patent: 4317135 (1982-02-01), Pitruzzello

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