| 摘要 |
PURPOSE:To enhance manipulability in starting alarm operation at the same o'clock every day, by stopping the alarm operation by an ON-signal when the alarm operation is started at set alarm o'clock. CONSTITUTION:When an alarm switch 6 is opened during alarm operation, FF8 is reset to stop the supply of an alarm signal phia to a sound generating circuit 18 and, therefore, the sounding of the alarm sound from the sound generating circuit 18 to stop the alarm operation. An optical sensor circuit 26 for outputting an ON-signal after the quantity of light with a definite value or more is irradiated is constituted so as to include a photo-transistor being a light-voltage converting element and the ON-signal being a single pulse is generated in an output line 26a to be supplied to an OR gate 24. Therefore, even if the quantity of light with a definite value or more is irradiated during alarm operation, the sounding of the alarm sound from the sound generating circuit 18 is stopped to stop the alarm operation. |
