Cell replacement indication device

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Details

58 50R, 58152H, G04C 300, G04B 1930

Patent

active

039628590

ABSTRACT:
An indicating device for use in an electronic watch circuit indicating visually on the dial of the watch that the power cell in the circuit is operating properly and the circuit itself is operating properly. Cessation of the visual signal indicates that the cell should be replaced. The device uses a light-emitting element energized intermittently by pulses generated in the watch's electronic driving circuit. The threshold voltage of the light-emitting element is higher than the voltage necessary to adequately drive the driving circuit for keeping time accurately. A drop of the voltage below this threshold results in absence of light emissions and this indicates the cell is near exhaustion and must be replaced.

REFERENCES:
patent: 2542021 (1951-02-01), Fox
patent: 3212252 (1965-10-01), Nakai
patent: 3505804 (1970-04-01), Hofstein
patent: 3672154 (1972-06-01), Habner
patent: 3672155 (1972-06-01), Bergey et al.
patent: 3678499 (1972-07-01), McCarty
patent: 3691755 (1972-09-01), Girard

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