| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem in a radio controlled timepiece for receiving a plurality of standard radiowaves wherein its structure and usage are complicated since it is necessary to adopt a method in which automatic switching takes place by providing a frequency recognition means on a received standard radiowave or for a user to perform manual switching. <P>SOLUTION: This frequency tuning circuit 31 of the radio controlled timepiece having a reception function for selectively receiving a standard radio wave having a frequency varying by area and picking out time information therefrom, is equipped with a resonance circuit 101 with a first coil 1 parallel-connected to a first capacitor 2, a second coil 3, and a second capacitor 4. In the tuning circuit, the resonance circuit is series-connected to the second coil, one terminal of the second capacitor is connected to the resonance circuit while the other terminal of the second capacitor is connected to the second coil, and a voltage across the one and the other terminals is used as an output voltage. The frequency characteristic of the output voltage has a plurality of frequency tuning points. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
