Horology: time measuring systems or devices – Regulating means – For compensation
Patent
1985-07-01
1988-03-08
Roskoski, Bernard
Horology: time measuring systems or devices
Regulating means
For compensation
368200, G04B 1720
Patent
active
047302860
ABSTRACT:
Rate change in a quartz crystal timepiece due, for example, to aging of a capacitance used for correcting the frequency-temperature characteristic of the crystal oscillator of the timepiece, is corrected by dividing the oscillator output signal to provide a minimum rate adjustment unit signal and a rate adjustment timing signal. A rate adjustment step width signal consisting of a number of minumum rate adjustment unit signals is predetermined for all of the timepieces in a production run. The number controls the repeated counting of unit signals to produce a series of step width signals. The rate adjustment required for correct timekeeping is determined as an integral number of step width signals. The latter number is set into a second counter in the timepiece to generate a rate adjustment signal. The rate adjustment signal controls the duty cycle of a switch which adds reactance to the crystal oscillator circuit to effect the rate change.
REFERENCES:
patent: 3568093 (1971-03-01), Ishida
patent: 4427302 (1984-01-01), Watanabe
patent: 4473303 (1984-09-01), Suzuki
patent: 4583059 (1986-04-01), Konno
Aizawa Hitomi
Yabe Hiroshi
Roskoski Bernard
Seiko Epson Corporation
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