| 摘要 |
PURPOSE:To enable the operation time of alarm to be accurately controlled with a simple constitution by synchronizing the contents of counter means forming reference pulse signals to the indication contents of the minute hand. CONSTITUTION:The divice is provided with an unlocking switching mechansim M which is controlled of the open and close time by a crown 6 for alarm time setting, electronic counter means 36 thru 40 which generate reference pulse signals at the specified periods by counting the low frequency output signals from a frequency dividing circuit 21 and a count content synchronizing means S1 which synchronizes the contents of said counter means to the indication contents of the minute hand 2 or the minute hand 2 and second hand 3. The actual alarm operation time is controlled by the output signal from the mechansim M and the reference pulse signals. |
