Electronic alarm clock

Details Electronic alarm clock Electronic alarm clock

1978-06-07

1981-07-21

Miska, Vit W.

Horology: time measuring systems or devices

Chronological

With simultaneous time indicating means

368 73, 368 76, 368 82, 368251, G04B 2500, G04B 1900, G04C 1900

Patent

active

042802091

ABSTRACT:
An electronic timepiece having an analog time display and a digital alarm setting system for actuating an alarm at a preset time. The timepiece includes a high-frequency time base whose output is applied to a frequency converter yielding low frequency timing pulses, these being applied to a motor for driving the hour and minute hands through a gear train. The alarm setting system includes an electro-optical digital display whose electronic actuator responds to the same timing pulses to provide a digital display concurrent with the analog display, and a microprocessor associated with a data memory adapted to store the digital value of any selected time setting. The microprocessor compares the existing time expressed as digital data with the stored digital value to produce a representative output signal when the existing value is coincident with the stored value. The output signal acts to trigger an alarm generator to produce an alarm for a predetermined period.

REFERENCES:
patent: 3931703 (1976-01-01), Scherrer
patent: 3945191 (1976-03-01), van Berkum
patent: 4045951 (1977-09-01), Tanaka
patent: 4104865 (1978-08-01), Sasaki

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