| 摘要 |
PURPOSE:To obtain an alarm clock with the 24 hours system without requiring space by modulating a point to indicate a.m. or p.m., when an alarm thime is indicated by a hand. CONSTITUTION:An alarm time is input from a switch S13 and is set on an alarm minute-hour time measuring circuit 18 and an alarm a.m. p.m. time measuring circuit 21 through a control circuit 19 with the set signal from a set pulse generating circuit 20. To indicate the alarm time on an analogue indicating system 2, a switch S24 is depressed to be in alarm mode. The control circuit 19 outputs a control signal, comparng as at 14 the contents of a minute-hour time measuring circuit 10 and an a.m. p.m. time measuring circuit 13 at the present time with those of the time measuring circuits 18 and 21. Then, an electromechanical converter 15 is quickly driven to indicate the alarm time as at 2. At this time, when the alarm a.m. p.m. time measuring circuit 21 measures p.m., a minute hand is modulated by the output from a modulated pulse generating circuit 17. |
