Electronic timepiece having a battery voltage monitor

Details Electronic timepiece having a battery voltage monitor Electronic timepiece having a battery voltage monitor

1976-01-28

1977-08-23

Witkowski, Stanley J.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

58 50R, 58152H, 340248B, 340249, G04B 4706, G04C 300

Patent

active

040431126

ABSTRACT:
In an electronic timepiece including a driving circuit for developing display driving signals, and a time display receptive of the display driving signals for displaying time, a battery voltage level monitor. The battery voltage level monitor comprises a voltage detector operative to detect the voltage of a battery which powers the timepiece, and to develop a detector signal when the battery voltage is less than a certain value. The driving circuit includes a display signal control circuit which is responsive to the setting of a display restoring switch and the detector signal for interrupting the display driving signals applied to the display in response to the detector signal, in order to de-energize the display to indicate that the battery voltage is below the certain level. The display signal control circuit is operable to apply the display driving signals to the display under control of the display restoring switch even in the presence of the detector signals thereby to enable the display of time after a low battery voltage condition has been detected.

REFERENCES:
patent: 3608301 (1971-09-01), Loewengart
patent: 3641545 (1972-02-01), Okada
patent: 3841087 (1974-10-01), Kikuchi
patent: 3898790 (1975-08-01), Takamune et al.
patent: 3949545 (1976-04-01), Chihara
patent: 3962859 (1976-06-01), Ito
patent: 3991553 (1976-11-01), Bergey et al.

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