Electronic timepiece

Details Electronic timepiece Electronic timepiece

1978-11-17

1980-08-12

Miska, Vit W.

Horology: time measuring systems or devices

Signalling means

Time condition responsive

368 73, 368250, G04C 300, G04C 2100, G04B 3712

Patent

active

042166470

ABSTRACT:
In an electronic alarm timepiece having an alarm accordance circuit for producing an alarm signal at a preset time in accordance with a time stored in a time memory circuit, an electromechanical acoustic transducer is provided having at least two mechanical resonant frequencies. One of the resonant frequencies is in the audible range and one of the resonant frequencies is in the ultrasonic range. The transducer is actuatable to produce an acoustic alarm in the audible range in response to the alarm signal and is selectively actuated to produce an acoustic output in the ultrasonic range for controlling devices external of the timepiece.

REFERENCES:
patent: 2580447 (1952-01-01), Lutz
patent: 4063410 (1977-12-01), Welling
patent: 4093944 (1978-06-01), Muncheryan
patent: 4144706 (1979-03-01), Willis

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