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US 3,948,036 AGranted
Electronic timepiece
AssigneeCitizen Watch Co., Ltd.
InventorShigeru Morokawa
Life of this patent
Estimating the term…
Abstract
An electronic timepiece comprising a plurality of time keep mechanisms adapted to be parallel operated, for example, an electrical time keep means and a mechanical time keep means, is disclosed. The electronic timepiece comprises a time set mechanism which can read out an information of mutual relation between a standard time and a kept time at an instant upon receipt of a standard time signal which is exteriorly supplied as an input and memorize said information and which can precisely synchronize the timepiece during its time keep operation with a standard timepiece based on said memorized information.
Claims18
An electronic timepiece comprising:
- a. a time unit signal generator including an oscillator for generating a frequency reference signal and means for forming from said frequency reference signal a time unit signal consisting of a pulse signal having a given frequency;
- b. a mechanical time keep means for effecting a time keep operation in accordance with the time unit signal from said time unit signal generator to display a kept time;
- c. an electrical time keep means for effecting the time keep operation independently of said mechanical time keep means in accordance with the time unit signal from said time unit signal generator;
- d. a manually operable correction means for correctting a kept time of said electrical time keep means;
- and
- e. a synchronizing signal generation means for comparing respective kept times of said mechanical and electrical time keep means to bring the kept time of the mechanical time keep means into coincidence with the kept time of the electrical time keep means.
3 more elements
An electronic timepiece comprising:
- a. a time unit signal generator including an oscillator for generating a frequency reference signal and means for forming a time unit signal consisting of a pulse signal having a given frequency from said frequency reference signal;
- b. a mechanical time keep means for effecting a time keep operation in accordance with the time unit signal from said time unit signal generator to display a kept time;
- an electrical time keep means for effecting a time keep operation independently of said mechanical time keep means in accordance with the time unit signal from said time unit signal generator;
- d. a manually operable correction means for correcting the kept time of said electrical time keep means;
- and
- e. a synchronizing means including a synchronizing signal generation means for detecting one period of the time keep operation of said mechanical time keep means to generate a synchronizing signal, means for comparing a time required for one period of said synchronizing signal with one period of the time keep operation of said electrical time keep means and means for bringing the kept time of said mechanical time keep means into in coincidence with the kept time of said electrical time keep means in accordance with the result obtained by said comparison means.
3 more elements
An electronic timepiece comprising:
- a. a time unit signal generator including an oscillator for generating a frequency reference signal and means for forming from said frequency reference signal a time unit signal consisting of a pulse signal having a given frequency;
- b. a mechanical time keep means for effecting a time keep operation in accordance with the time unit signal from said time unit signal generator;
- c. an electrical time keep means for effecting the time keep operation independently of said mechanical time keep means in accordance with the time unit signal from said time unit signal generator;
- d. a display means for displaying the time kept by said mechanical time keep means;
- e. a manually operable correcting signal generation means;
- f. means for correcting the kept time of said electrical time keep means to a standard time by means of the correcting signal from said correcting signal generation means;
- g. a synchronizing means including means for detecting the kept time of said mechanical time keep means to generate a synchronizing signal and adapted to select either one of the following operations to coincide respective kept times of said mechanical and electrical time keep means with each other, one of said operations detecting the difference between respective kept time of said mechanical and electrical time keep means when said synchronizing signal is supplied as an input and feeding a correcting signal having a frequency which is higher than the frequency of said time unit signal to said mechanical time keep means until the kept time of said mechanical time keep means coincides with the kept time of said electrical time keep means and another operation blocking said time unit signal fed to said mechanical time keep means until the kept time of said mechanical time keep means coincides with the kept time of said electrical time keep means;
- and
- h. a temporary stop means for blocking said time unit signal fed to said electrical and mechanical time keep means only when said temporary stop means is manually operated.
6 more elements
An electronic timepiece comprising:
- a. a time unit signal generator including an oscillator for generating a frequency reference signal and means for forming from said frequency reference signal a time unit signal consisting of a pulse signal having a given frequency;
- b. a mechanical time keep means for effecting a time keep operation in accordance with the time unit signal from said time unit signal generator to display its kept time;
- c. an electrical time keep means for effecting a time keep operation independently of said mechanical time keep means in accordance with the time unit signal from said time unit signal generator;
- d. a time display means for displaying a time kept by said mechanical time keep means;
- e. means for comparing respective kept times of said mechanical and electrical time keep means to bring the former kept time into in coincidence with the latter kept time;
- f. a manually operable correction means for correcting the kept time of said electrical time keep means;
- and
- g. a display means for visually displaying the fact that said time unit signal generator is operating during the correcting operation of said correction means.
5 more elements
Dependencies are inferred from the claim text.