Sensing focus of a color kinescope

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

H - Electricity

04

N

350/1, 350/99

H04N 5/58 (2006.01) H01J 9/44 (2006.01) H04N 17/04 (2006.01)

Patent

CA 1163356

RCA 76,325 Abstract of the Disclosure 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.

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