Electromagnetic focusing circuit for cathode-ray tube

Details Electromagnetic focusing circuit for cathode-ray tube Electromagnetic focusing circuit for cathode-ray tube

H - Electricity

01

J

H01J 29/98 (2006.01) H04N 3/18 (2006.01) H04N 3/26 (2006.01)

Patent

CA 2164784

A switching control means individually turns each switching means on or off so that a current having which waveform is approximate to a parabolic waveform and is appropriate for focusing flows in a focusing coil, synchronizing with a horizontal sweep. When the focusing current increases, energy is transferred from the power source to the focusing coil. When the focusing current decreases, energy is returned from the focusing coil to the power source by a flywheel current. Thus, the focusing current is supplied with less consumption. -24-

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