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Electronic timepiece
   
Document Number
US Patent 4630936
Issued Date
December 23, 1986
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Inventors
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Abstract
The timepiece comprises an oscillator (1), a frequency divider (2), a control circuit (3), a stepping motor (4), a seconds hand (5), a circuit (7) for detecting steps missed by the motor, an up-down counter (15) having a capacity N, and a flip-flop (16). At each missed step the detecting circuit (7) generates a tally pulse (S.sub.7) which increments the counter (15). The latter is also decremented by periodic pulses appearing on the B output of the frequency divider (2). When a cell supplying the timepiece is nearly exhausted, the number of steps missed per unit of time is high and the counter (15) is, on balance, incremented. When passing from state N-1 to state N the counter issues on its Q.sub.h output a pulse that causes the Q output of the flip-flop (16) to go high. The control circuit (3) produces, in response to this high state of the flip-flop, a signal warning of the imminent end of the cell's life in the form of an irregular motion of the seconds hand (5). Otherwise, when the cell is still good, the number of missed steps is low and the counter (15) is decremented. When passing from state 1 to state 0 the counter issues on its Q.sub.b output a pulse that causes the Q output of the flip-flop (16) to go low, thereby stopping the warning signal.
Drawing
Electronic timepiece - US Patent 4630936 Drawing
Drawing from US Patent 4630936
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Number of Claims:
5
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Owner
Asulab S.A. (Bienne,CH)
Published
December 23, 1986
Application Number
06/850,784
Filed
April 11, 1986
US Classification
368/66   968/490 968/505
Int'l Classification
G04C   3/00   (20060101)   G04C   10/00   (20060101)   G04C   3/14   (20060101)   G04C   10/04   (20060101)  
Examiner
Attorney/Law Firm
Priority Data
Apr 12, 1985 [CH] 01571/85
USPTO Field of Search
368/66   368/76   368/80   318/696  
Related Patents
4759003 - Electronic analog timepiece with voltage checking function - Owned by Seiko Instruments Inc. (Tokyo,JP)

An electronic analog timepiece with voltage checking function, which detects the power source condition, and which informs the user of the necessity of charging operation by changing the magnitude of the power source voltage into the distance by which the hand is carried or the amount by which the hand is moved upon operation from external side. The hand is stopped from moving for a predetermined period of time in the first time only in which the voltage checking operation is carried out.

Claims
Description
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