| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that, in an FM tuner having a double tuning circuit, it is difficult to downsize the FM tuner when a tuning coil is formed with a spring coil. SOLUTION: Coils L1 and L2 used for two LC circuits of a double tuning circuit are formed with a single bobbin coil 108. On a bobbin 120 of the bobbin coil 108, winding grooves 124 and 126 separated at a distance G are formed. The coils L1 and L2 are formed by winding conductive wires on the winding grooves 124 and 126, respectively. The distance G is set to loosely couple the coils L1 and L2 to each other. COPYRIGHT: (C)2009,JPO&INPIT
|
