1975-07-11
1976-08-24
Weldon, Ulysses
58 23A, G04C 300
Patent
active
039758982
ABSTRACT:
An electronic timepiece including a variable divider for producing timekeeping signals for the smallest digit of time displayed having a frequency which is not evenly divisible into the frequency produced by the time standard. An oscillator includes a time standard for producing a high frequency time standard signal having a frequency of K.sup.N Hz where K and N are positive integers other than O, and a divider adapted to evenly divide the high frequency time standard signal by K.sup.M, where M is an integer other than O, and in response thereto produce a K.sup.N.sup.-M frequency signal having a frequency not evenly divisible by I.sup.P, where I is a positive integer other than K and P is an integer. A counter is provided for producing output signals representative of a counting cycle in response to an input pulse signal applied thereto, and a display device is coupled to the counter for displaying each count of the cycle thereof. A detecting circuit is coupled to the counter to detect at least one predetermined count of each counting cycle thereof, and in response to each predetermined count produces a detection pulse. The variable divider is coupled to the detection circuit and has a first and second division ratio. The variable divider is adapted to receive the K.sup.N.sup.-M frequency signal and in response thereto divides same by a first division ratio, and in response to each said detection pulse applied thereto divides the K.sup.N.sup.-M frequency pulse by said second division ratio to thereby produce an input pulse signal to the counter having a frequency evenly divisible by I.sup.P.
REFERENCES:
patent: 3777471 (1973-12-01), Koehler et al.
patent: 3812669 (1974-05-01), Wiget
patent: 3914931 (1975-10-01), Tsuruishi
patent: 3922844 (1975-12-01), Sakamoto
Kabushiki Kaisha Suwa Seikosha
Weldon Ulysses
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