Electronic watch with alarm

Abstract

Abstract PURPOSE: To constitute small size and simple constitution for the watch with alarm, by commonly using the drive coil of step motor to the booster coil for piezoelectric oscillator driving. CONSTITUTION: The watch pulse from the drive circut 3 is fed to the drive coil 6 of the step motor and time display is made via the step motor. When alarm time is set provided at the alarm set section 9, the coincidence pulse having broad width is produced from the alarm control circuit 10 delayed with the time drive pulse, the switches 12, 13 are selected and the coincidence pulse is boosted at the coil 6 and fed to the piezoelectric oscillator 19. Accordingly, the buzzer tone is produced from the oscillator via the switching transistor 16 turned on and off with a given frequency signal outputted from the circuit 10, resistor 17 and capacitor 18 to constitute the alarm tone. As a result, the drive coil of the step motor is commonly used as the booster coil for piezoelectric oscillator drive, resulting that the constitution of the electronic watch with alarm is made small and simple. COPYRIGHT: (C)1980,JPO&Japio

Inventors

• 👤 Minoru Watanabe

Bibliographic Details