| 摘要 |
PURPOSE:To readily and surely correct the time of the portable watch side by transmitting standard time signal to the portable watch side through transmission from the master watch and detecting the difference from the own time. CONSTITUTION:On the portable watch side, the radio waves being sent from the master watch side are received with a receiving antenna 6 and the time signal is drawn out by a receiving part 7 and is then stored in a register part 8. A watch circuit part A is so formed as to generate second pulses by dividing down the output from the transmitting part with a frequency dividing part 11 and send the second pulses to a step motor and second counter 13 with analog type and the second pulses to a second counter 13 with digital type. The difference between the register part 8 and counter 13 is detected in a difference detecting part 9 by an instruction by the start or end signal. In a control part 10, controlling is so made as to stop inputting of the second pulses by closing the gate 12 in case the watch is fast and send the rapid feed pulses to the gate 12 when it is slow, whereby the time correction of the watch circuit part A may be performed. |
