JP3753839B2 - Electronic clock - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to the adjustment of the temperature dependence of the rate in a rechargeable electronic timepiece.
[0002]
[Prior art]
First, a conventional rechargeable electronic timepiece that adjusts the temperature dependence of the rate will be described.
FIG. 2 is a circuit block diagram of a conventional rechargeable electronic timepiece that adjusts the temperature dependence of the rate, 1 is an oscillation circuit that oscillates a reference signal, and 2 is a frequency divider circuit that divides the signal of the oscillation circuit 1. It is.
Reference numeral 3 denotes a waveform shaping circuit that creates a motor driving signal using the signal from the frequency dividing circuit 2, reference numeral 4 denotes a motor driving circuit for driving the motor using the signal from the waveform shaping circuit 3, and reference numeral 5 denotes a motor. A motor is driven by the drive circuit 4, and 6 is a pointer operated by the motor 5.
Reference numeral 7 denotes a temperature measurement timing creation circuit for creating a temperature measurement timing using the signal of the frequency divider circuit 2, reference numeral 8 denotes a temperature measurement circuit that operates at the timing created by the temperature measurement timing creation circuit 7, and 9 denotes This is a rate adjusting circuit that determines an adjustment amount based on temperature data measured by the temperature measuring circuit 8 and adjusts the rate. 10 is a solar cell for charging, 11 is a secondary battery that stores the energy of the solar cell 10 and serves as a power source for operating the watch, and 12 is a voltage measuring circuit that measures the voltage of the secondary battery 11. It is. Reference numeral 13 denotes a reset circuit that resets the circuit and adjusts the time of the hands.
[0003]
Next, the operation of the conventional rechargeable electronic timepiece for adjusting the temperature dependence of the rate will be described with reference to FIG.
First, a circuit that adjusts the temperature dependence of the rate will be described. The temperature measurement timing creation circuit 7 creates a 30-minute signal, for example, using the signal of the frequency divider circuit 2. The temperature measurement circuit 8 measures the temperature every time the 30-minute signal from the temperature measurement timing generation circuit 7 is input. The rate adjustment circuit 9 calculates the temperature dependency of the oscillation circuit 1 based on the temperature data of the temperature measurement circuit 8 and determines the adjustment amount. The frequency dividing circuit 2 digitally adjusts the rate according to the adjustment amount of the rate adjusting circuit 9. As a result, the temperature dependence of the oscillation circuit 1 is adjusted for the output signal of the frequency dividing circuit 2, and the temperature dependence of the motor driving signal created by the waveform shaping circuit 3 based on the signal of the frequency dividing circuit 2 is also adjusted. Therefore, the motor 5 and the pointer 6 that operate based on this signal also operate at a rate with the temperature dependency adjusted.
Next, the charging-related circuit will be described. The energy generated in the solar cell 10 is stored in the secondary battery 11, and the voltage measurement circuit 12 measures the voltage of the secondary battery 11, determines the voltage value, and sends a signal to the waveform shaping circuit 3. Based on the determination of the voltage measurement circuit 12, the waveform shaping circuit 3 performs switching between 1-second operation for moving the motor once by 1 step per second and 2-second operation for moving by 2 steps once per second. This allows the user to recognize that the amount of power stored in the secondary battery 11 is small.
[0004]
[Problems to be solved by the invention]
However, the circuit for adjusting the temperature dependence of the rate and the voltage measurement circuit operate independently of each other , and the operation of the temperature measurement circuit 8 is also performed at the time of a voltage drop at which the reliability of the measurement result becomes doubtful. When the measurement circuit 8 is operated, the voltage is further reduced, and the operation life of the watch may be shortened.
Further, the temperature measurement circuit 8 does not measure the temperature until the timing of the voltage rise temperature measurement timing creation circuit 7, and there is a time zone in which the temperature dependence is not adjusted despite the presence of voltage.
Further, when the oscillation stops when the voltage drops, the temperature measurement circuit 8 operates before the time adjustment after the voltage rise and the power is wasted despite the fact that the pointer is out of order.
An object of the present invention is intended to solve the above problem, when a voltage drop stops the operation of the temperature measuring circuit 8, to prevent the wrong adjustment, to prolong the operating life of the timepiece at the same time, the voltage rises occasionally An electronic watch that forcibly measures the temperature regardless of the timing of temperature measurement , adjusts the temperature dependence immediately, and once the oscillation stops, does not measure the temperature until the time is corrected and minimizes power consumption Is to provide.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the electronic timepiece of the present invention is provided with an operation determination circuit for reflecting the voltage information of the secondary battery, the oscillation stop information of the oscillation circuit, and the information on whether or not the time is adjusted to the temperature measurement circuit. It is characterized by that.
DETAILED DESCRIPTION OF THE INVENTION
[0006]
The configuration of the embodiment of the present invention will be described below with reference to FIG.
FIG. 1 is a circuit diagram block diagram of an electronic timepiece according to the present invention. The same elements as those in FIG.
Reference numeral 14 denotes an oscillation stop detection circuit that detects that the oscillation of the oscillation circuit 1 has stopped. Reference numeral 15 denotes an operation of the temperature measurement circuit 8 based on information on the voltage measurement circuit 12, the reset circuit 13, and the oscillation stop detection circuit 14. This is an operation determination circuit.
Next, the operation of the embodiment of the present invention will be described with reference to FIG.
When the voltage measuring circuit 12 determines that the voltage of the secondary battery 11 is lower than a predetermined voltage value , the waveform of the waveform shaping circuit 3 is switched and the operation determining circuit 15 operates the temperature measuring circuit 8 based on the information. Stop. As a result, it is possible to avoid erroneous correction due to a malfunction of the temperature measurement circuit 8 at a low voltage, and to extend the life of the clock operation. During this period, the adjustment amount of the rate adjustment circuit 9 is set to a predetermined constant value (specifically, data with the highest oscillation frequency) to minimize the error of the rate due to temperature dependency. deep. Thereafter, when the voltage measurement circuit 12 determines that the voltage of the secondary battery 11 is higher than a predetermined voltage value and the oscillation stop detection circuit 14 has not detected the oscillation stop of the oscillation circuit 1, the waveform of the waveform shaping circuit 3 is At the same time, the operation determination circuit 15 forcibly operates the temperature measurement circuit 8 regardless of the timing of the temperature measurement timing generation circuit 7. As a result, the temperature dependence can be corrected immediately after the voltage is restored . Thereafter, the temperature measurement circuit 8 is operated at each timing by the temperature measurement timing generation circuit 7. Further, when the voltage measurement circuit 12 determines that the voltage of the secondary battery 11 is high and the oscillation stop detection circuit 14 has detected the oscillation stop of the oscillation circuit 1, and the reset circuit 13 has never been operated. Since the timepiece of the watch itself is out of order, it is not necessary to correct the temperature dependence of the rate. Therefore, until the reset circuit 13 operates, that is, until the timepiece of the watch is set, the operation determination circuit 15 sets the temperature measuring circuit 8 to Do not operate. The temperature measurement circuit 8 is operated only after the reset circuit 13 operates. When the reset is released by the reset circuit 13, the operation determination circuit 15 forcibly operates the temperature measurement circuit 8.
Hysteresis may be provided for the voltage at which the operation of the temperature measurement circuit 8 is stopped and the voltage at which the operation of the temperature measurement circuit 8 is resumed.
The operation of the temperature measurement circuit 8 is stopped and restarted, and the switching of the hand movement mode may not be linked.
[0007]
【The invention's effect】
As described above, according to the present invention, the temperature measurement can be stopped at the time of a voltage drop that may cause erroneous measurement by the temperature measurement circuit, and erroneous correction in the erroneous measurement can be avoided, and at the same time, the life of the clock operation can be extended. Can measure. In addition, there is no case where the temperature dependency is not corrected even though the voltage is sufficient, and the temperature dependency is corrected and the power is wasted even though the guide is out of order. Disappears.
[Brief description of the drawings]
FIG. 1 is a circuit block diagram of an electronic timepiece showing an embodiment of the present invention.
FIG. 2 is an external view of an electronic timepiece showing a conventional example.
[Explanation of symbols]
7 Temperature measurement timing generation circuit 8 Temperature measurement circuit 9 Rate adjustment circuit 12 Voltage measurement circuit 13 Reset circuit 14 Oscillation stop detection circuit 15 Operation determination circuit

Claims (5)

Determines the oscillation circuit having temperature dependence, the rate adjusting means for correcting the temperature dependence, the temperature measuring means that operates periodically to determine the adjustment amount of the rate adjusting means, and the interval at which the temperature measuring means operates. An electronic timepiece having temperature measurement timing creating means, charging means, power storage means, voltage measurement means for measuring the voltage of the power storage means, and reset means for resetting each means at the same time as correcting the time ,
While stopping the temperature measuring means when the voltage of the power storage means falls below a predetermined voltage value,
The adjustment amount of the rate adjusting means is set to an adjustment amount at which the oscillation frequency of the oscillation circuit becomes the highest,
An electronic timepiece characterized by continuously operating a rate adjusting means. 2. The temperature measuring means is forcibly operated regardless of the timing of the temperature measurement timing creating means when the voltage of the power storage means rises higher than the stop voltage value of the temperature measuring means after the voltage drop. Electronic watch. 3. The electronic timepiece according to claim 2, wherein, even when the voltage rises, once the oscillation of the oscillation circuit stops, the temperature measuring means is not operated until the circuit is reset. 3. The electronic timepiece according to claim 2, wherein a hysteresis is given to a voltage value for stopping the operation of the temperature measuring means and a voltage value for restarting the operation of the temperature measuring means. 3. The electronic timepiece according to claim 2, wherein the predetermined voltage value is a voltage value that changes a hand movement form.

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