Radioactive timing source for horologic instruments and the like

Details Radioactive timing source for horologic instruments and the like Radioactive timing source for horologic instruments and the like

1978-03-27

1987-06-30

Miska, Vit W.

Horology: time measuring systems or devices

Electrical time base

Solid state oscillating circuit type

357 29, G04F 500, G01T 124

Patent

active

046766618

ABSTRACT:
The randomly-generated energy produced by decay of a radioactive source is utilized to generate timing signals for horologic and chronographic instruments such as electronic watches, clocks or chronometers. The radioactive source is implanted by ion implantation or diffusion in or near the depletion region of a P-N junction semiconductor device which may be integrated on a common semiconductor substrate with the electronic timekeeping circuitry of the horologic or chronographic instruments. Individual pulses due to beta radiation produced in the depletion region causes electron migration from the P to the N region of the device and produces electrical pulses. These pulses are amplified and counted until a preselected count is reached. When such count is reached, the timekeeping circuitry is stepped by one second or some convenient fraction thereof.

REFERENCES:
patent: 3257570 (1966-06-01), Dehmelt et al.
patent: 3724201 (1973-04-01), Bergey

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