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US 4,128,991 AGranted
Electronic digital watch
AssigneeEbauches S.A.
InventorJean-Claude Robert-Grandpierre
Life of this patent
Estimating the term…
Abstract
An electronic digital watch including a device for enabling the correction of the minutes and seconds display. The device includes a delay circuit which only enables a correction to be effected if the push-button for correcting the display is actuated for a predetermined time, and means for resetting the seconds display to zero and, if the watch is slow, advancing the minutes display by one.
Claims4
An electronic digital watch comprising
- a quartz crystal oscillator,
- a divider chain,
- counters and circuits for displaying hours, minutes and seconds,
- and a means for correcting the counters for the minutes and seconds when the difference between the indicated time and the actual time is not more than plus or minus 30 seconds, said correcting means comprising,
- a push button,
- a first logic circuit,
- a time delay circuit which is activated by the operation of said push button and which produces an output signal only if the said push button is actuated until the end of the time delay period, the said output signal being delivered via said first logic circuit to the seconds counters to put said seconds counters into a state corresponding to the actual time at the end of said time delay operation, and
- a second logic circuit for determining when the watch is slow and for delivering a correcting pulse to the minutes counter, the outputs of said seconds counters being inputted to said second logic circuit, said second logic circuit delivering said correcting pulse to the minutes counter at the end of the time delay operation.
5 more elements
Dependencies are inferred from the claim text.