| 摘要 |
PURPOSE:To make accurate time corrections of an electronic watch with a 30-second distributing reset-to-zero unit, by making it possible to correct a minute counter by unit time only during a constant period of time even when reset-to-zero operation would be done in a state of an error of more than 30 seconds. CONSTITUTION:In case of a difference of -30-+29 seconds from a correct time, closing reset-to-zero switch SW resets divider circuit 2 and second counter 3 and when the time is late, carry pulse PC is applied to minute counter 3. At the time of an advance within a range of 30-59 seconds, operating the reset-to-zero twice disallows carry pulse PC after one minute to pass through AND1 by output Q3 of shift register 8 and minute counter 3 continues its current state for two minutes and is initialized by reset pulse pr after the operation time of timer 11. At the time of delay of 31-59 seconds, operating switch SW three times differentiate output Q4 of shift register 8 to apply it to minute counter 5 as a carry signal. |
