Patent ID: 7583942

Claim:
A radio controlled timepiece comprising following items incorporated into an exterior part: a tuning circuit comprising a semiconductor substrate which comprises a plurality of semiconductor switches, a plurality of first capacitors, connected each in series with said plurality of semiconductor switches, switch controlling means for controlling opening and closing of said semiconductor switches, and a coil connected in parallel to said plurality of first capacitors; wherein the total electrostatic capacitance of said plurality of first capacitors is varied according to the electrostatic capacitance corresponding to a standard radio wave that includes time information by said switch controlling means individually controlling said opening and closing of said plurality of semiconductor switches connected to said plurality of first capacitors, so as to vary a tuned frequency of a tuning circuit formed by said plurality of first capacitors and said coil; a control means, which controls said tuning circuit, and which has a receiving circuit, which inputs a standard radio wave received by said tuning circuit and performs time correction; and a display means, which displays time information from said control means; a wireless interface circuit that wirelessly receives a control signal for making said control means execute a control of changing the tuned frequency by opening and closing said semiconductor switches respectively and tuning control information for setting the tuned frequency; and a tuning control information memory that stores the tuning control information.