H - Electricity – 01 – J
Patent
H - Electricity
01
J
316/3
H01J 9/00 (2006.01) H01J 9/42 (2006.01)
Patent
CA 1145812
15.6.1979 1 PHN 9304 ABSTRACT: "Method of determining variations in the previously adjusted nominal distance between the facing surfaces of a colour selection electrode and a display window near the corners of the display window of a colour television display tube, and device for carrying out the method" The invention relates to a method of determining variations in the previously adjusted nominal distance between the facing surfaces of a colour selection electrode and a display window of a colour television display tube in places situated near the corners of the display window. In this method the capacitance is measured of a capacitor of which one electrode is formed by the colour selection electrode and the other electrode is formed by a measuring electrode surrounded by a screening electrode, which measuring electrode is provided on the outer surface of the display window. By eccentrically moving the measuring electrode in a direction towards the corner of the display window relative to the screening electrode and by a suitable choice of the outside dimensions of the screening electrode, capacitance variations as a result of glass thickness variations in the display window are negligibly small with respect to the capacitance variations as a result of variations in the previously adjusted nominal distance between the facing surfaces of the colour selection electrode and the display window.
341839
Schmidt Rolf
Van Den Berg Jacob
Koninklijke Philips Electronics N.v.
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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