| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a magnetic core for antenna which does not cause deviation in the width direction of a soft magnetic thin belt material, is light and compact, has constant strength in a longitudinal direction, has no irregularity in the curved surface and thickness of the soft magnetic thin body material at a lengthwise end part in each product and obtains optional curved surface and thickness as designed. <P>SOLUTION: In an antenna comprising the magnetic core 1 for an antenna where belt-like cobalt based amorphous 2 (soft magnetic thin belt material) is wound around a bobbin 3 to be laminated and which has a curved surface 4 at end parts, a coil 5 for transmission wound around the magnetic core 1 for antenna, and an oscillation circuit 6 connected to the coil 5, the bobbin 3 is provided with recessed parts 7 for winding around the cobalt based amorphous 2 a plurality of times, and the cross section shape of the recessed parts 7 of the bobbin 3 in the width direction is of an H shape 9, providing a tapered shape 11 with a plane surface 12 at an end part 10. <P>COPYRIGHT: (C)2004,JPO |
