Method for the automatic measurement of convergence and for...

Details Method for the automatic measurement of convergence and for... Method for the automatic measurement of convergence and for...

H - Electricity

01

J

355/13

H01J 9/44 (2006.01) H01J 9/42 (2006.01) H04N 9/28 (2006.01) H04N 17/04 (2006.01)

Patent

CA 1299297

ABSTRACT OF THE DISCLOSURE For the automatic determining of the characteristics of the corrections to be made in trichromatic cathode tube deflectors, measurements are made of the coordinates of the midpoints of the bars R and B of a crossed bar test pattern at "strategic" places. With the deflector in the "mean" position on the tube, the values obtained are standardized by computation to re-establish virtually the ideal position of the deflector, the convergence errors due to this deflector are computed and the pinpoint or overall corrections to be made to it are deduced therefrom. 22

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