Apparatus for suppressing field radiation from a cathode ray tube

摘要

An anode ripple voltage waveform is detected by a capacitor (21) built into a flyback transformer (1). The detected waveform is phased by a phasing circuit (5), has its amplitude adjusted by an amplitude adjusting circuit (6) and is then applied to an addition circuit (7). Its horizontal component is detected by a horizontal output transformer (9). The detected component is phased by a phasing circuit (10), then has its amplitude adjusted by amplitude adjusting circuit (11) and is then added with the anode ripple component by addition circuit (7), inverted and amplified by an inverting amplifier (8), and then applied to an antenna (12) provided in proximity to a cathode ray tube (3). Thus, the electric fields radiated from the face of cathode ray tube (3) are suppressed. <IMAGE>