| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an induction heating device that reduces buoyancy exerted on an object to be heated and causes a low loss. <P>SOLUTION: The induction heating device comprises: a heating coil 3 for induction-heating an object to be heated (not shown) that is made of a low permeability material and that has a high electrical conductivity; and an electrical conductor 7 provided between the object to be heated and the heating coil 3. Because of the effect of an induction current induced by the heating coil 3, the electrical conductor 7 has a function of reducing buoyancy exerted on the object to be heated due to a repulsive force between a magnetic field generated by the heating coil 3 and a magnetic field generated by an induction current induced in the object to be heated. The electrical conductor 7 is provided with a slit 9 for limiting the distribution of the induction current that flows circularly in the electrical conductor 7 nearly in parallel with the direction in which the current of the heating coil 3 flows. The slit 9 is formed to extend from an innermost part of the conductor 7 opposed to the heating coil 3 to an outermost part thereof. Since the induction current is thereby limited at a portion of the conductor 7 where a large amount of induction current is induced directly above the coil 3, it is possible to greatly reduce heat generation in the conductor 7 and to increase heating efficiency for the object to be heated. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
