JPH09304555A - Electronic timepiece - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic timepiece which can be returned to a precise present time even after the movement of a needle has been stopped in order to save the power and whose power can be saved without a fear that the time becomes out of order. SOLUTION: A first counter 15 which measures the time elapsed after a motor 2 has been stopped is installed, and a second counter 16 which measures the displayed time in which the motor 2 is turned quickly is installed. Then, when a time display is to be returned to a present time, the motor is turned quickly until the value of the second counter 16 agrees with the value of the first counter 15. Since the first counter 15 measures the time elapsed while the motor is turned quickly, it can be returned to a precise time without the deviation of the time when the motor is turned quickly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic timepiece having a time display motor.

[0002]

2. Description of the Related Art In recent years, small electronic timepieces such as wristwatches can be equipped with various functions such as calculation functions and advanced measurement functions in addition to the timekeeping function, and have become indispensable for daily life. It's starting. Therefore, an electronic timepiece is required to operate stably and continuously for a long time without battery replacement. Further, in place of a conventional button battery or the like, an electronic timepiece equipped with a power generation device that captures kinetic energy using a weight and converts it into electric energy, a solar cell, etc. has been developed. In electronic timepieces equipped with these power generation functions, it is possible to continue operation without battery replacement,
Further, by providing a power storage device in case power cannot be obtained from the power generation device, stable operation can be achieved even when the device is removed from the arm or under night conditions.

[0003]

However, if an electronic timepiece provided with a solar cell is left for a long time without being exposed to sunlight, the power storage device will also be discharged, and the electronic timepiece will stop clocking. . The same applies to an electronic timepiece equipped with a device for generating power using a weight, and if left for a long time, the power storage device discharges. Once the clock is stopped, the correct time will not be displayed even if the generator restarts power generation and the clock is started. In particular, in an electronic timepiece that uses a motor to move hands or drives a display plate to display time, the electric power consumed by the motor is relatively large. Therefore, in order to display the correct time for a long time, a large power storage device having a large capacity is required. However, in a small and lightweight electronic timepiece suitable for carrying, the capacity of a power storage device that can be mounted is limited.
Furthermore, in recent years, electronic timepieces that have multiple functions such as communication functions in addition to the timekeeping function have been developed. As the number of functions installed increases, the power consumption also increases, and the time that can be displayed more and more. Will be limited.

For this reason, in a wristwatch equipped with a solar cell, it has been considered that the hand movement by the motor is stopped when no power is generated from the solar cell. Then, it is conceivable that the timekeeping signal is counted while the hand movement is stopped, and the second hand is fast-forwarded by the counted amount when the solar cell starts to generate power to return to the current time display and restart the timekeeping. There is. By performing such processing, power consumption is reduced and the discharge time of the power storage device is extended. Therefore, even if the electronic timepiece is left for a long time, the electronic timepiece continues to measure the time. Therefore, the current time is counted inside the electronic timepiece even when power is not supplied from the solar cell for a long time, and the current time can be displayed by fast-forwarding the second hand accordingly.

However, if the hand movement is stopped for a long time, it takes a considerable time to fast-forward and return to the display of the current time. Therefore, since the elapsed time during fast-forwarding is not reflected even if the display is returned to the current time display, in reality, once the hand movement is stopped, the accurate time is not displayed. Therefore, the user needs to set the time in order to display the accurate time. Further, if the user does not notice that the hand movement has been stopped, the delayed time remains displayed on the electronic timepiece, and the accuracy of the timepiece is substantially reduced.

Therefore, in the present invention, it is possible to stop the hand movement in order to extend the discharge time of the power storage device or extend the battery life, and further, to display the accurate time again when the hand movement is resumed. The purpose is to provide a possible electronic timepiece. Another object of the present invention is to provide an electronic timepiece that can reproduce the current time in a short time when the power generation level of the power generator is restored or a request for redisplay is made.

[0007]

Therefore, in the present invention, a first counter for counting the elapsed time after the motor is stopped and a second counter for counting the display time advanced by fast-forwarding the motor. A counter is provided, and when the time is displayed again, fast forwarding is performed until the values of the first and second counters match. That is, the electronic timepiece of the invention includes at least one motor for displaying time,
A power supply that supplies power to the motor, a first counter that counts the elapsed time after the motor has stopped, a second counter that counts the display time advanced by fast-forwarding the motor, and after the motor has stopped. It is characterized by having a control means for fast-forwarding the motor until the values of the first counter and the second counter match and then restarting the time display. In the electronic timepiece of the invention, the first counter for counting the elapsed time and the second counter for counting the fast-forwarded display time are separately provided. Therefore, the first counter can continuously count the elapsed time while the motor is fast-forwarding in addition to the elapsed time after the motor is stopped. Therefore, the display time can be returned to the accurate current time by fast-forwarding until the values of the first and second counters match, and the correct time can be displayed thereafter.

When the power supply includes a power generation device and a power storage device charged by the power generation device, the control means stops the motor when the power generation level of the power generation device decreases, and when the power generation level increases. By starting the time display, the discharge time of the power storage device can be extended and accurate timekeeping can be achieved for a long time. Further, it is desirable to provide a timer that starts when the generated power level decreases and reaches a predetermined value, and stop the motor after a predetermined time has elapsed by this timer. By providing such a timer, the hand movement can be stopped and power saving can be performed only when the user does not need the electronic timepiece for a long time, such as when the user has left the arm for a long time or left in the dark room. Therefore, when you are just not moving your arm,
In a situation where the user may immediately refer to the time, such as at night, the time can be continuously displayed without inadvertently stopping the hand movement.

It is also effective to provide a means for detecting the display position of time, and stop the motor to save power when the display position of time reaches a predetermined position after the generated power level is lowered. . It is possible to easily determine whether the electronic timepiece is stopping the hand movement to save power, or the hand movement is stopped due to a failure and the time is not being measured, depending on the display position of the time in the stopped state. It will be possible.

It is also possible to provide a switch for stopping the motor and restarting the time display. For example, in a pocket watch, when the lid is closed, the motor is stopped to save power, and when the lid is opened, fast-forwarding to the current time can be performed. Further, a switch for stopping the motor may be provided to save power, while the time display may be restarted when the power generation level of the power generator increases.

As the motor, a first motor for displaying seconds and a second motor for displaying hours and minutes are provided, and the first motor is provided.
You may stop only the motor of. Power saving can be achieved by stopping the first motor, while the second motor continuously displays hours and minutes, so that the time can always be seen. Further power saving can be achieved by stopping the first and second motors. Further, by providing the first and second motors, it is possible to return the display of the seconds and the hours and minutes to the correct current time, so that the time for fast-forwarding the first and second motors can be shortened. Therefore, it is possible to shorten the time for returning to the current time and reduce the power consumed for fast-forwarding.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an electronic timepiece 1 according to the present invention.
The main configuration of is shown using a block diagram. The electronic timepiece 1 of this example includes a first motor 2 for moving the second hand and a second motor 3 for moving the hour hand and the minute hand to display the hour and minute, and along with this, the first motor 2 A first control block 10 for controlling the motor and a second control block 20 for controlling the second motor 3 are provided. Further, the power supply block 30 for supplying power to the first and second motors 2 and 3 is provided. The power supply block 30 of this example includes a power generation device 31 and a secondary battery charged by the power generation device 31 or The power storage device 32 including a capacitor is provided. Power is supplied from the power supply block 30 to the drive circuits 11 and 21 of the motors 2 and 3, and also to the oscillation frequency dividing circuit 5 having an oscillation function and outputting a pulse of a predetermined frequency. ing. From the oscillation frequency dividing circuit 5, a 1 Hz signal φ1 for driving the first motor 2 for moving the second hand, a 1/5 Hz signal φ2 for driving the second motor 3 for moving the hour hand and minute hand, and , And a signal φ3 of 32 Hz for driving these motors 2 and 3 in the fast-forwarding manner are output, and these are supplied to the respective drive circuits 11 and 21. Of course, the frequencies of these signals are examples and do not limit the present invention. Further, the electronic timepiece 1 of this example includes the monitoring circuit 6 that monitors the generated power level by the voltage of the power supplied from the power supply block 30, and indicates that the voltage has dropped and reached the predetermined value V1. Signal φ5,
A signal φ indicating that the voltage has risen and reached a predetermined value V2
5 (bar) or the like can be supplied to each control block 10 and 20.

The control blocks 10 and 20 have almost the same structure, and the description will focus on the first block 10 for controlling the second hand. The first control block 10 receives a signal φ5 indicating that the power supply voltage has dropped due to a drop in the generated power level from the monitoring circuit 6 and starts the timer 1
The timer 13 outputs a signal to the control circuit 12 when a predetermined time is measured (time-up). On the other hand, when the signal φ5 (bar) indicating that the power supply voltage is restored from the monitoring circuit 6 is received before the time is up, the time counting is stopped and the counting time is reset.
When the control circuit 12 receives the time-up signal from the timer 13, it confirms the contents of the display position counter 17,
When the counter 17 reaches 0, the drive circuit 11 is stopped and the movement of the motor 2 is stopped. The display position counter 17 is a sixty-decimal counter, and the hand movement pulse of the second hand 51 causes the second hand 5
The position of 1 is always reflected. The display position counter 17 can be reset by the crown 55. If the display position counter 17 is reset at the position of the second hand at 12 o'clock, the position where the display position counter 17 becomes 0 after the timer 13 times up,
That is, when the second hand reaches the 12 o'clock position, the motor 2 that drives the second hand is stopped. Therefore, in the electronic timepiece 1 of the present example, the movement of the second hand can be stopped at the position designated by the user during power saving.
It can be determined that power saving is in progress.

The control circuit 12 stops the drive circuit 11 and, at the same time, starts counting using the first counter 15. A pulse signal φ1 of 1 Hz for clocking is input to the first counter 15, and the elapsed time after the motor 2 is stopped is counted. In addition, the control circuit 12
When the signal .phi.5 (bar) from which the power is restored is received from the monitoring circuit 6, the driving circuit 11 is driven by the signal .phi.3 for fast-forwarding to fast-forward the motor 2. At the same time, the fast-forwarding signal φ3 is supplied to the second counter 16 to start counting. Then, when the values of the first counter 15 and the second counter 16 match, the drive circuit 11 is driven by the signal φ1 which is a normal signal to perform the second hand movement, and the time counting process is restarted. At the same time, the first and second counters 15 and 1
6 is reset. The first and second counters 15 and 16 are hexadecimal counters, and the first counter 15
In order to count the elapsed time after the motor 2 is stopped in units of seconds, it counts with a signal φ1 of 1 Hz. On the other hand, the second counter 16 is supplied with a 32 Hz signal φ2 for fast-forwarding, which counts the position of the fast-forwarding second hand. Therefore, the first counter 15 measures (up counts) the elapsed time even after the fast-forwarding of the motor 2 is started. Therefore, the second counter 16 is up-counted by the signal φ2,
By performing the fast-forwarding until the value of the first counter 15 matches, the time delay due to the return can be completely prevented, and the normal timekeeping operation can be returned after the accurate current time is displayed.

A second control block 20 for displaying hours and minutes
Is a timer 23, a control circuit 22, a first counter 25
It also has a second counter 26 and operates in much the same way as the first control block 10 displaying the seconds described above.
However, a counter for the display position is not provided, and the movement of the motor 3 can be stopped immediately to save power as soon as the timer 23 times out. It may take time for the hand that displays the hour and minute to reach the predetermined display position, and it is possible to determine whether or not the power is being saved by the stop position of the second hand. The minute control block 20 is not provided with a display position counter. Further, it is desirable that the set time of the timer 23 is set to be the same as or longer than that of the timer 13. The second hand returns to the current time in 1 to 2 seconds, but in order to return the hour and minute display, a maximum delay of 12 hours occurs. It costs.

Return time = 12 hours × 60 minutes × hand movement step (60 × 1/5 Hz) / return speed (32 Hz) (1) Therefore, if the power save mode is frequently entered, the current time is displayed. Some waiting time is required. For this reason, the hour and minute display does not shift to the power save mode carelessly, and the power can be saved according to the situation in which the user is left for a long time, such as when the user wears a different watch. Is desirable.

On the other hand, since the electronic timepiece 1 of this example adopts a two-motor system of the motor 2 for displaying the seconds and the motor 3 for displaying the hours and minutes, the current time can be restored up to about 4 minutes and a half. It has been shortened to. Therefore, if the power is saved for 1 to 2 hours, the current time can be restored in about 20 to 40 seconds. Therefore, under such a situation that the recovery time is not a problem in operation, it is possible to shift to power save more frequently, and it is possible to suppress power consumption. Moreover, the recovery time can be further shortened by adopting a three-motor system in which the motor for displaying the time and the motor for displaying the minutes are further divided, and in a short period of time such as during sleep or rest of the user. Even if there is, it will be possible to shift to the power save mode, and after returning, it will be possible to quickly return to the display of the current time. Further, since the electronic timepiece of this example uses two of the first and second counters to fast-forward to the current time for both the second display and the hour / minute display, the current time when the respective displays are restored is set. It is possible to completely prevent the deviation from, and always display the accurate time.

In the electronic timepiece 1 of this example, the counters 15 and 16 of the first control block 10 for controlling the second display are 60-base counters, and the stop time of the motor 2 is 60 seconds or more. In that case, instead of fast-forwarding all the elapsed time, it is only necessary to fast-forward only from the stop position of the second hand to the position of the second hand at the current time.
Further, the counters 25 and 26 of the second control block 20 which controls the hour / minute display employ an 8640-base counter capable of counting 12 hours in accordance with the hand movement step of ⅕ Hz. Therefore, when the stop time is 12 hours or more, the hour / minute hand is not unnecessarily fast-forwarded by one rotation, but is only fast-forwarded from the stop position to the current time. Therefore, if the stop time is long, the power for displaying the time can be significantly reduced.

FIG. 2 shows the flow of processing relating to power saving of the electronic timepiece of this embodiment. First, in step 61, the power supply voltage is confirmed. When the power supply voltage becomes equal to or lower than the predetermined value V1, the monitoring circuit outputs a signal φ5 indicating a voltage drop. As a power generator 31 of the power supply block 30, a solar cell, an AGS that converts kinetic energy into electric energy by using a weight, etc. are adopted, and the timekeeping function and other functions of the electronic timepiece are utilized without using the battery You can do it. It is usually impossible for these power generators to continuously generate power, and power is not generated at night, while the user is resting, or when left for a long time. Therefore, during that time, the electric power discharged from the power storage device 32 makes use of the timekeeping function, etc., but if the period during which power generation is not performed becomes long, the voltage supplied from the power storage device 32 decreases, and finally the oscillation frequency division is performed. The functions of the circuit 5 and the like will stop.
Therefore, in this example, the power consumed by stopping the motors 2 and 3 is reduced, and the function of the electronic timepiece can be utilized for a longer period of time.
Therefore, the configuration of the power supply block 30 is not limited to this example, and a normal battery may be used, and the battery life can be significantly extended when the electronic timepiece is not used for a long period of time. Of course, even when the time is not displayed, the accurate time is measured inside the electronic timepiece, so that it is possible to return to the accurate display of the current time at any time.

When the signal φ5 indicating the voltage drop due to the decrease in the generated power level is supplied, the timers 13 and 23 are started in step 62. Then, in step 63, it is judged whether or not the second timer 13 is up, and when the time is up, the position of the second hand is further confirmed in step 64. And the counter 17
When it is determined that the position of the second hand has reached the predetermined position, the motor is stopped in step 65, and at the same time, the first counter 15 for measuring the elapsed time is started. On the other hand, in the hour / minute display, it is determined in step 66 whether or not the timer 23 is up. If the time is up, the motor 3 is stopped in step 67 and the first counter 25 for measuring the elapsed time is started. . If the timer 13 or 23 has not timed up, or if the position of the second hand has not reached the predetermined position, the process proceeds to step 68, and it is confirmed whether the generated power level becomes high and the power supply voltage is restored. To do. If the power supply voltage is restored while the timers 13 and 23 are operating or before the second hand reaches the predetermined position, it is not necessary to perform fast-forwarding.
In step 70, the timer is reset and the process returns to step 61 to continue monitoring the power supply voltage and determine the generated power level.

On the other hand, the motor is stopped and the first counter 1
After starting the elapsed time measurement at 5 and 25, fast-forward is required. Therefore, after confirming the return of the power supply voltage in step 68, the process moves from step 69 to step 71 to perform fast-forwarding, and at the same time, the second counter 16
And 26 are started. Then, in step 72, fast-forwarding is performed until the first counters 15 and 25 and the second counters 16 and 26 respectively match.
As a result, the time display accurately returns to the current time including the elapsed time during the fast-forwarding, so that the normal display mode is entered in step 73 to display the time. At the same time, in step 74, the timers 13, 2
3 and counters 15, 16, 25 and 26 are reset, and the process returns to step 61 to continue monitoring the power supply voltage.

FIG. 3 shows a different example of the electronic timepiece 1 according to the present invention. The electronic timepiece 1 of the present example is a two-motor type including a motor 2 for displaying seconds and a motor 3 for displaying hours and minutes in the same manner as described above. Only the control block 10 of the motor 2 for displaying seconds saves power. A mechanism for shifting is provided. Since the mechanism for shifting to power save is the same as in the above example, the same reference numerals are given and description thereof is omitted. In the electronic timepiece 1 of this example, only the second hand stops moving when shifting to power save, and the hour hand and minute hand continue moving. Therefore, even in the power saving state, the hour and minute always indicate the exact time, and the user can always know the exact time. In addition, when the calendar function is provided and the calendar function is linked to the motor 3 for displaying hours and minutes, the electronic timepiece 1 of this example is effective and the motor 3 does not stop, so the calendar display is always accurate. It can be carried out. On the other hand, when the electronic timepiece 1 is left for a long time, the second hand stops, so that the power consumption can be reduced and the time can be accurately displayed for a long time.

FIG. 4 shows a further different example of the electronic timepiece 1 according to the present invention. The electronic timepiece of this example is a one-motor type electronic timepiece that displays seconds and hours by one motor 2. The drive block 10 of the motor is provided with a mechanism for stopping the motor and shifting to the power save as in the above. The mechanism for restoring the power saving and the time display is the same as in the above example, so the same reference numerals are given and the description thereof is omitted. Since the electronic timepiece 1 of this example is a one-motor type, the time to return to the current time is slightly longer than that of the electronic timepiece of the above example. However, the electronic timepiece 1 of this example
Has a simple structure, and further, since a power saving mechanism for returning to the accurate current time is provided, an electronic timepiece capable of displaying the time accurately for a long time can be provided at low cost.

FIG. 5 shows a further different example of the electronic timepiece 1 according to the present invention. The electronic timepiece of this example is a one-motor type electronic timepiece, and further uses a battery 35 as a power source. The stop of the motor 2 and the restart of the time display are performed by the switch 59 provided on the electronic timepiece. Therefore, the electronic timepiece 1 of this example is
When the switch 59 is pressed, the time display is stopped and the power save mode is entered. When the switch 59 is further pressed, the time display is restarted, and the first and second counters 15 and 16 are
The motor 2 can be fast-forwarded to display the accurate current time. Therefore, when the user does not need to display the time for a long time, such as when the watch is exchanged and used, the user can select it and shift to the power save mode. When the time display is required, the switch 59 can be pressed to easily return to the display mode, and the display of the seconds and hours can be fast forwarded to display the accurate current time. Further, the switch 59 for instructing the stop of the motor can be interlocked with, for example, the lid of the pocket watch, and when the user does not see the time, the time display is stopped, and when the time display is necessary, the switch 59 is restarted. It is possible to control such as displaying.

FIG. 6 shows a further different example of the electronic timepiece 1 according to the present invention. The electronic timepiece of this example is also a one-motor type electronic timepiece, and includes a switch 5 for stopping the motor 2.
9 are provided. Further, the monitoring circuit 6 is provided, and when the monitoring circuit 6 detects that the generated power level becomes high and the power supply voltage is restored, the time display is restarted. The electronic timepiece 1 of this example employs, for example, an AGS or a solar battery as the power generation device 31, and when the user leaves it for a long time, the user presses the switch 59 to stop the time display and enter the power save mode. You can
Then, next, when the user wears the electronic timepiece 1 on the wrist or when the user irradiates sunlight, the monitoring circuit 6 detects the restart of power generation and restarts the time display. Therefore, the user can restart the time display without any operation.

As described above, the electronic timepiece according to the present invention described above is provided with the first and second counters, and even if the time display is stopped, it is possible to return to the accurate current time by performing fast forward. Is. For this reason, the power can be saved by stopping the motor when the time display is unnecessary or when it is considered unnecessary. Therefore, the power consumption supplied from the power storage device or the battery can be significantly reduced, and the time can be continuously measured for a long period of time. For this reason, it is possible to prevent, for a user or the like who uses a plurality of watches by exchanging them according to the purpose, a problem that the watch is useless because the battery runs out when the watch is mounted. Further, in an electronic timepiece using a power generation device such as a solar cell or AGS, it is possible to reduce power consumption during a period in which power is not generated, and, apart from the display, the timekeeping function itself can be utilized for a long time. The present invention is also effective in securing electric power used for other various functions of the time counting function.

Although the embodiments of the present invention have been described with reference to some examples in the above, it goes without saying that the present invention is not limited to the above examples. It is of course possible to use the functions described in the above examples in different combinations, for example, a switch for stopping and redisplaying the motor and a power supply voltage change that accompanies fluctuations in the generated power level automatically Of course, it is also possible to install the function of stopping and displaying again.

[0028]

As described above, in the electronic timepiece of the present invention, the first counter that counts the elapsed time after the motor is stopped and the second counter that counts the fast-forwarded display time. By separately providing, since the first counter can continuously count not only the elapsed time after the motor is stopped but also the elapsed time while the motor is fast-forwarding, the display time is accurately set to the current time. It is possible to return it, and the correct time can be displayed after that. Therefore, the basic function of the electronic timepiece for displaying the correct time is not impaired, and the power can be saved by stopping the motor when the time display is unnecessary. The user side does not need to perform a troublesome operation such as adjusting the time each time the time display is restored, and the electronic timepiece of the present invention displays the correct time even after power saving, so the electronic timepiece can be safely used. Can be used. As described above, according to the present invention, it is possible to provide an electronic timepiece that can save power without worrying that the time will be wrong.

Further, by providing a timer that starts when the generated power level drops to a predetermined value,
It is possible to prevent the time display from being stopped by accidentally shifting to the power save mode. Further, a means for detecting the display position of the time by the motor is provided, and when the display position of the time reaches a predetermined position after the generated power level is lowered, the motor is stopped to stop the hand movement for power saving. It is possible to judge whether or not it is. Further, it is possible to allow the user to select the stop position using a crown or the like. Further, a switch for stopping the motor and restarting the time display may be provided, and the stop / restart of the time display may be left to the user's selection. Furthermore, by adopting a two-motor type that has a motor that displays seconds and a motor that displays hours and minutes, or a three-motor type that separately displays hours and minutes, the time display recovery time is short and frequent. It becomes possible to provide an electronic timepiece that can save power by shifting to the power save mode.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration example of an electronic timepiece according to the invention.

FIG. 2 is a flowchart showing a process in the electronic timepiece shown in FIG.

FIG. 3 is a block diagram showing a different configuration example of the electronic timepiece according to the invention.

FIG. 4 is a block diagram showing still another configuration example of the electronic timepiece according to the present invention.

FIG. 5 is a block diagram showing still another configuration example of the electronic timepiece according to the present invention.

FIG. 6 is a block diagram showing still another configuration example of the electronic timepiece according to the present invention.

[Explanation of symbols]

 1 ... Electronic clock 2, 3 ... Motor for display 5 ... Oscillation frequency dividing circuit 6 ... Monitoring circuit 10, 20 ... Control block 11, 21 ... Motor drive circuit 12, 22 ... Control circuit 13, 23..Timer 15, 25..First counter 16, 26..Second counter 17..Third counter 30..Power supply block 31..Power generation device 32..Power storage device 35..Battery

Claims (10)

[Claims] 1. At least one motor for displaying time, a power supply for supplying electric power to the motor, a first counter for counting elapsed time after the motor has stopped, and fast-forwarding the motor. A second counter that counts the advanced display time and, after the motor has stopped, fast-forwards the motor until the values of the first counter and the second counter match, and then uses the motor to set the time. An electronic timepiece having a control means for restarting display. 2. The motor according to claim 1, wherein the power source includes a power generation device and a power storage device charged by the power generation device, and the control unit controls the motor when the power generation level of the power generation device decreases. Is stopped, and the time display is started when the generated power level becomes high, the electronic timepiece. 3. The timer according to claim 2, further comprising a timer that starts when the generated power level decreases to a predetermined value, and the control means stops the motor after a predetermined time has passed by the timer. An electronic watch characterized in that. 4. The device according to claim 2, further comprising means for detecting a display position by the motor, wherein the control means is configured to reduce the generated power level after
An electronic timepiece, wherein the motor is stopped when the display position reaches a predetermined position. 5. The electronic timepiece according to claim 2, wherein the power generation device is at least one of a device that converts mechanical energy into electric energy and a solar cell. 6. The electronic timepiece according to claim 1, further comprising a switch that stops the motor and restarts the time display. 7. The switch according to claim 1, further comprising a switch for stopping the motor, wherein the control means starts the time display when a power generation level of a power generator that is the power source becomes high. Electronic clock. 8. The motor according to claim 1, wherein the motor includes a first motor that displays seconds and a second motor that displays hours and minutes, and only the first motor is stopped. A characteristic electronic watch. 9. The motor according to claim 1, wherein the motor includes a first motor that displays seconds and a second motor that displays hours and minutes, and the first and second motors stop. An electronic watch characterized in that. 10. The electronic timepiece according to claim 1, wherein the power source is a battery.