Electronic wristwatch including auxiliary power supply

Details Electronic wristwatch including auxiliary power supply Electronic wristwatch including auxiliary power supply

1977-12-27

1980-01-08

Rubinson, Gene Z.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

58 50R, 307 64, G04C 300

Patent

active

041821106

ABSTRACT:
An electronic wristwatch including an auxiliary power supply for energizing at least the timekeeping circuit when the main power supply is being removed for replacement is provided. The wristwatch includes a high frequency time standard that vibrates at a high frequency and a timekeeping circuit coupled to the high frequency time standard for converting the high frequency vibrations of the time standard into low frequency timekeeping signals representative of actual time. A display is coupled to the timekeeping circuit for displaying actual time in response to the low frequency timekeeping signals applied thereto. The main power supply is coupled to the timekeeping circuit and to the display for delivering a voltage of a sufficient magnitude to operate the timekeeping circuit and display. A voltage detection circuit is selectively coupled to the main voltage supply and is further coupled to the auxiliary voltage supply and detects when the main voltage supply is removed from the wristwatch and, in response thereto, is adapted to couple selectively the auxiliary voltage supply to the timekeeping circuit at least until the main power supply is again returned to the wristwatch.

REFERENCES:
patent: 3757131 (1973-09-01), Krutz
patent: 3968864 (1976-07-01), Moyer

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