| 摘要 |
PURPOSE:To reduce the needless radiation from a deflection yoke significantly by providing cancel coils holding a piece of magnet in itself and connected to the horizontal deflection colls respectively on the outside of the vertical deflection coils wound on the outer periphery of as annular core so as the outer leakage magnetic field of the horizontal deflection magnetic field is canceled. CONSTITUTION:A pair of saddle type horizontal deflection coils 2 and 3 are wound, enclosed in a coil bobbin 6, across the inner cylindrical surface and the both outer edge surfaces of the annular core 1 semi-annular cores respectively. And a pair of semi-annular toroidal deflection coils 4 and 5 are wound on the outer surface of the core 1 to construct the yoke body 7. New cancel coils 8 and 9 wound on a piece of magnet 10 and 11 respectively are provided additionally on the outside of the coil 4 and 5, and connected to the coil 2 and 3 respectively. Thereby an inverse magnetic field is produced against the outer leakage magnetic field of the horizontal magnetic field so as the leakage magnetic field can be canceled to reduce the needless radiation. Therefore this device can be useful for the imaging equipment using high frequency. |
