DISCHARGE LAMP WITH VARYING BRIGHTNESS Russian patent published in 1997 - IPC

FIELD: light display panels. SUBSTANCE: device has discharge lamp with heated cathode, ignition circuit, which is connected to lamp, direct current power supply, which is connected to anode and cathode electrodes of lamp, and brightness control circuit which is connected to lamp anode. Discharge lamp is designed as small-size discharge tube with two filaments. Terminals of first filament are connected to terminal of heating source, negative terminal of direct current power supply is connected to heating source. Brightness control circuit has controlled switch. Another claim of invention describes device design with longer service life in which heating source has transformer; terminals of first filament are connected to secondary winding of transformer, and negative terminal of direct current power supply is connected to central tap of secondary winding of transformer. EFFECT: increased functional capabilities. 3 dwg