GEOMETRICAL DISTORTION CORRECTING CIRCUIT DEVICE

PURPOSE: To easily remove a distorted horizontal scanning line error by insertion-connecting the primary coil of a differential converter in the current circuit of scanning line deflecting currents, and insertion-connecting a secondary coil in the current circuit of vertical deflecting currents. CONSTITUTION: A deflecting unit for deflecting an electronic beam is provided at an image receiving tube neck 10 of a reproducing tube 1, and the deflecting unit is constituted of horizontal deflecting coils 2, 2' and vertical deflecting coils 3, 3'. Currents it from a scanning line output stage 4 and current iv from a vertical output stage 5 are supplied to the coils 2, 2' and 3, 3'. Primary coils 6, 6' of a differential converter 7 are connected with a current circuit for the scanning line deflecting currents. A secondary coil 8 of this differential converter 7 is insertion-connected in a vertical deflecting current circuit. Thus, correcting currents in an opposite direction can be mutually generated at a scanning line start edge and a scanning line end edge, and deviation can be removed.