| 摘要 |
<p>PURPOSE:To obtain a flyback transformer (FBT) whose unnecessary radiation level is reduced without a magnetic shielding plate surrounding it, by providing a short-circuiting coil around the outer periphery of the transformer. CONSTITUTION:A short-circuiting coil 10 of this FBT is wound around the outer periphery of the main body 17 of a transformer, being disposed at a position at which a leakage magnetic field of FBT 34 is strongest. By setting the width of the coil, the dimensions of the sectional area thereof, etc. properly, the intensity of leakage magnetic fields 14 and 15 can be lessened in a desired degree. By providing the short-circuiting coil around on the outer periphery of FBT and in the direction in which the coil is wound crossing with the leakage magnetic fields of this FBT, in this way, an unnecessary radiation level is reduced without confining the leakage magnetic fields inside.</p> |
