Method and apparatus for demagnetizing color CRT

摘要

By passing electric current through a degaussing coil within a vertical retrace period, a displayed image is prevented from disturbance and yet color blurs on the way of degaussing process are made indiscernible. In the process of discharging charges filled in capacitors C1 and C2 through the degaussing coil, a damped oscillation current by a closed loop of one of the capacitors and the degaussing coil is generated, and then a damped oscillation current of opposite polarity generated by a closed loop of the other capacitor and the degaussing coil is passed, within such a short time as color blurs in the degaussing process cannot be discerned and during the vertical retrace period. With these two damped oscillation currents paired, degaussing operation is fulfilled.