| 摘要 |
PROBLEM TO BE SOLVED: To exactly set a timepiece by standard time wave without complicating and enlarging the structure of the timepiece. SOLUTION: In a master machine 30, time is automatically corrected by receiving standard time information with an antenna 1. If one want to correct time for a slave machine 35, an operation switch 38 of the master machine 30 is operated and an infrared LED 13 is driven so as to transmit light of code burst signal from a light emission part 32. On the other hand, by operating an operation switch 39 of the slave machine 35 and letting a light reception element 20 in light reception state, the above code burst signal is received. The slave machine 35 corrects time based on the code burst signal and the time is indicated as the result of the correction by driving the indication part 29. |
