AUTOMATIC OSCILLATION ERROR CORRECTING DEVICE FOR ELECTRONIC TIMEPIECE

Japanese Patent JP3281757

B2

PURPOSE: To automatically correct an electronic timepiece getting out of order due to the error of a clock oscillation frequency by storing the time elapsed until the time error reaches a fixed value, the number of correcting times of the width of the fixed value, and surplus time produced when the correction is temporarily interrupted.
CONSTITUTION: The quotient of (f÷&verbar f-f0&verbar ) (where, (f) and f0 respectively represent the clock oscillation frequency and natural clock oscillation frequency of an electronic timepiece), &verbar f-f0&verbar , and the remainder of (f÷&verbar f-f0&verbar ) are respectively stored in storing means 1, 2, and 3. A counting means 1A initializes its count value when the count value of clock signals reaches the storing value of the storing means 1 and another counting means 2A initializes its count value when the count value of signals from the counting means 1A reaches the storing value of the storing means 2 after counting the signals. A third counting means 3A initializes its count value when the count value of the same frequency dividing clock signal as the input of the counting means 1A reaches the storing value of the storing means 3 after counting the clock signal. The time of an electronic timepiece is corrected by the period of the frequency dividing clock signal in the directions opposite to the (+) and (-) signals of (f-f0) whenever signals are outputted from the storing means 1A-3A.

Masayuki Mochizuki

JP9024995A

May 13, 2002

March 23, 1995

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Amano Co., Ltd.

G04G3/00; G04D7/00; G04G3/02; (IPC1-7): G04G3/02

JP212084A
JP1296190A
JP56103395A

Masakazu Yajima

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