Color television display tube with resistor for interference radiation reduction
AssigneeU.S. Philips Corporation
InventorGosse J. Postma
Life of this patent
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Abstract
Interference radiation produced by a color television tube during operation is reduced by incorporating a resistor of approximately 5 kOhm to 100 kOhm between a shadow mask and a conductive layer on the tube's display screen. This resistor reduces by 4-6 dB electromagnetic energy radiated by the tube in the frequency band of approximately 150 kHz to 1.5 MHz.
Claims3
A color television display tube comprising an envelope having a neck, a cone and a window, an electron beam producing means located in said neck, a display screen provided on the internal surface of said window and covered with an electrically conductive layer, a shadow mask situated at a short distance from the display screen, and means for electrically connecting the shadow mask to the conductive layer, said electrical connection means having a resistance of approximately 5 kOhms to 100 kOhms.
Dependencies are inferred from the claim text.