| 摘要 |
<p>PURPOSE:To realize precise time measurement by an analog electronic watch, by counting the unit time less than a second by means of a counter and driving the hands. CONSTITUTION:A divide-down output of a frequency divider 5a through a gate 15 which opens according to the start command from a stopwatch is applied to a driving circuit 8a by way of a frequency divider 5b and a counter 6a, and the second hand is driven through a motor 9a until the gate 15 is closed by a measurement end command. On the other hand, by this end command, an AND gate 25 opens, and when the counting of a counter 6b of dividing pulses in the units less than a second, such as 1/100 second, of a frequency divider 5c similar to the frequency divider 5b conincides with the counting of the counter 6a of the dividing pulses in the units such as 1/100 second at the time of the measurement end, a motor 9b turns according to the counting of the counter 6a through a judging circuit 7, so that the hand for displaying less than a second is driven. Therefore, an analog electronic watch capable of displaying less than a second correctly and easily may be obtained.</p> |
