Electricity: measuring and testing – Electric lamp or discharge device – Cathode-ray tube
Patent
1980-12-02
1983-10-04
Tokar, Michael J.
Electricity: measuring and testing
Electric lamp or discharge device
Cathode-ray tube
356121, G01R 31024
Patent
active
044081634
ABSTRACT:
The dimensions and light output of a beam in a shadow mask cathode-ray tube are determined by means of an optical system 7 focussed on a phosphor dot to pick up and record the light generated by a ray 4 passing through a single aperture 6 in the shadow mask 2. The cathode-ray beam 1 is moved so that the whole cross-section of the beam passes the aperture 4. The detected light outputs are plotted to provide an accurate representation of the whole beam. Repeating the procedure for each gun gives a precise record of the misconvergence of the beam
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P. Griffis, Kinescope Spot Size as it Relates to Picture Quality, vol. cl 23, No. 1, Feb. 1977, pp. 14-21, IEEE Trans on Consumer Electronics.
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Burr Peter
Chase Brian D.
Paton Andrew
Sowter Brian R.
International Business Machines - Corporation
Poag Frederick D.
Tokar Michael J.
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