Colour cathode-ray tube apparatus

Details Colour cathode-ray tube apparatus Colour cathode-ray tube apparatus

H - Electricity

01

J

355/6

H01J 29/00 (2006.01) H04N 9/16 (2006.01) H04N 9/20 (2006.01)

Patent

CA 1151312

COLOUR CATHODE-RAY TUBE APPARATUS ABSTRACT Information about the position of an electron beam in a shadow mask colour cathode-ray tube is obtained by detecting a signal representative of the electron beam current inter- cepted by the shadow mask. The signal may be derived by detecting the current generated by the electron beam in the shadow mask, or in the conductive layer at the tube screen, or by detecting the difference between the electron beam currents in the mask and at the screen. In the latter case, the shadow mask and the conductive layer are connected respectively to the ends of the primary winding of a trans- former. The difference currents are detected by a secondary winding. A centre tap of the primary winding is connected to the tube EHT. EHT isolation may also be achieved by optical or capacitive decoupling. The shadow mask may have shaped apertures to generate distinctive difference currents. In a preferred embodiment the apertures are slits or rows of slots extending from one side to the other of the shadow mask and a line raster is such that each line coincides with a different slit. EHT isolation may also be achieved by optical or capacitive decoupling.

352845

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