Method and apparatus for automatically calibrating a graticuled

Details Method and apparatus for automatically calibrating a graticuled Method and apparatus for automatically calibrating a graticuled

1985-12-02

1988-06-07

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

With radiant energy sensitive control means

358 10, 358 69, 324 74, 324121R, 324130, H01J 3126, H04N 1702, G01R 1320

Patent

active

047499079

ABSTRACT:
A method and apparatus for automatically calibrating the deflection of an electron beam in a graticuled cathode ray tube. The apparatus includes a microprocessor and digital-to-analog converter for generating input signals of a predetermined accuracy and sending the signals to an amplifier of a cathode ray tube to deflect the electron beam across graticule lines on the faceplate. A phototransistor optically coupled to the faceplate detects the electron beam coinciding with the graticule and in response generates an electrical signal. Signal processing circuitry processes the signal to remove noise from it and retrieve detection signals. The microprocessor receives the detection signals from the signal processing circuitry, compares each detection signal to its corresponding input signal, and adjusts the gain and offset of the amplifier in response to the comparison. Additional circuitry digitally records the beam position relative to the graticule lines.

REFERENCES:
patent: 3501583 (1970-03-01), Schwartz
patent: 3872348 (1975-03-01), Astley
patent: 4099092 (1978-07-01), Bristow
patent: 4160935 (1979-07-01), Groot et al.
patent: 4231060 (1980-10-01), Culter
patent: 4441120 (1984-04-01), Gerritser
patent: 4471270 (1984-09-01), Guyot
patent: 4553091 (1985-11-01), Bristol
patent: 4602272 (1986-07-01), Duschl
patent: 4607288 (1986-08-01), Freyberger
patent: 4677340 (1987-06-01), Miller et al.

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