| 摘要 |
PURPOSE:To diffuse the concentration of disturbances in a part of directions and to average the disturbances in all directions by changing the magnetic field distribution of the electromagnetic disturbances (EMI) to the outside of an apparatus mainly caused by leak magnetic field of a deflection yoke, etc., by the magnetic field of a coil for correction. CONSTITUTION:The coil L1 which is connected to the horizontal coil of the deflecting yoke 1 so as to be in series thereto to pass a horizontal deflecting current is provided in the display apparatus consisting of a cathode-ray tube. The coil L1 is disposed and fixed near the deflecting yoke 1 so as to average the horizontal direction distribution on the outside of the apparatus of the magnetic field leaking from the deflecting yoke 1 by the magnetic field generated from the coil L1. Namely, the coil L1 for correction is provided near the deflecting yoke, i.e., on the right side when viewed from the rear surface in such a case. The optimum disposition position and direction of the coil L1 for correction vary with the specifications of the apparatus and, therefore, the optimum position is discovered at each time. The magnetic flux PHI1 by the horizontal coil of the deflecting yoke 1 and the magnetic flux PHI2 by the coil L1 for correction interfere with each other. |
