H - Electricity – 01 – J
Patent
H - Electricity
01
J
316/3
H01J 9/42 (2006.01) G01B 7/14 (2006.01)
Patent
CA 1102404
PHD. 77-078. ABSTRACT: For a true reproduction in colour television display tubes it is of importance to accurately establish whether the distance between the colour selection elec- trode and the display window corresponds to the previously adjusted nominal distance. Not only variations may occur in the said distance, but variations may also occur in the nominal glass thickness of the display window. When measured capacitively errors occur in the measured dis- tance as a result of said variations in the glass thick- ness. These errors are minimized by a method wherein a measuring electrode is positioned on the surface of the display window remote from the colour selection electrode, a screening electrode is positioned on the said surface, which screening electrode surrounds said measuring elec- trode and has an outer dimension such that sufficient electrical field inhomogenities are produced between the colour selection electrode and the measuring electrode, and the capacitance between the measuring electrode and the colour selection electrode is measured by means of an alternating voltage. In this way variations in the glass thickness up to at most 15% of the nominal thick- ness produce a negligible change in the measured capaci- tance. For a range of glass thicknesses of the display window and a range of distances between the colour selection electrode and the display window the outside dimensions of the screening electrode are given. A prac- tical embodiment of a device for carrying out the method is disclosed also.
306817
Achtermann Bernhard
Kutscher Hans L.
Lankes Hans
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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