Horology: time measuring systems or devices – Power supply details – Electrical
Patent
1997-12-08
1999-08-24
Roskoski, Bernard
Horology: time measuring systems or devices
Power supply details
Electrical
368203, G04B 100
Patent
active
059433019
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an improvement in the reliability of reverse hand movement in an analog multifunction electronic watch which has a hand that is linked to a motor that can run forward and in reverse and which displays the time as well as another function other than the time, and which also has as a power supply and an electrical storage means which stores electrical energy that is generated by an external electrical generating means.
BACKGROUND OF THE ART
An analog multifunction watch which has a motor that can run forward and in reverse and which uses a primary cell such as a silver battery or a lithium battery has already been developed as a product. General functions of an analog multifunction watch include an alarm function, a chronograph function, and a timer function and the like.
A product has also been developed in the form of a charged-type watch which uses a combination of an external electrical generating means such as a solar cell or an automatic winding electrical generator and either a two-layer large-capacity capacitor or a secondary cell.
However, the analog charged-type watches of the past were only single-function types which merely move the hour, minute, and second hands every one second, and even if they had some function added, it was limited to a calendar function which is a linked day-of-the week plate.
In a single-function watch, it is sufficient to run the hands in the forward direction only. However, in a multifunction watch, to shorten the time required for switching between modes and for correcting the hand positions, in addition to forward hand movement, it has become necessary to run the hands in reverse as well.
By using a load compensation system as disclosed in the Japanese Unexamined Patent Publication (KOKAI) No. 61-18151 (in which when rotation by a drive pulse fails, rotation is effected by outputting a larger compensation pulse) even if there is a variation in voltage in the forward drive pulse for the purpose of driving hands forward, the position indicated by the hands was not skewed.
Therefore, in a charged-type watch, even if an electrical storage means is charged during forward hand movement, there was no particular problem.
However, based on the principle disclosed in Japanese Unexamined Patent Publication (KOKAI) No. 52-80063, a reverse pulse which moves the hands in reverse does not have the compensation pulse of the forward pulse. Therefore, in a charged-type watch, if the electrical storage means is charged during reverse hand movement, so that the voltage varies, it was not possible to compensate the rotation.
DISCLOSURE OF THE INVENTION
An object of the present invention is to provide a multifunction electronic watch with electrical generating means, which includes an analog multifunction watch and a digital multifunction watch which improves on the above-noted problems with the prior art, and wherein electrically generated energy generated from an electrical generating means is not stored in an electrical storage means during the time in which the electronic watch is displaying a function other than the time display, and wherein when the abovenoted reverse pulse is output or when the reverse pulse is used, the output voltage is stabilized, so that the rotation of the hand-moving motor can be stabilized.
To attain the object of the present invention, an electronic watch having an electric generating function according to the present invention has the following basic technical constitution.
Specifically, an electronic watch such as either an analog multifunction watch or a digital multifunction watch according to the present invention, having a motor which can be run forward and in reverse, and has hands that are linked to the motor, includes a function selecting means which selectively causes to operate either the time display function or a function other than the time display function. The watch includes-an external electrical generating means and an electrical storage means which stores electrical energy gener
Citizen Watch Co. Ltd.
Roskoski Bernard
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