JP2008008630A - Apparatus and method for correcting time error of electronic timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for correcting time errors of electronic timepieces, which corrects time errors of electronic timepieces with little electric power consumption. <P>SOLUTION: Correction data in which time is related to a correction value to the time at every prescribed interval is previously stored in a correction data storage part 70. By the retroactive correction of a time error correction part 83 on time errors which have occurred during the past standby mode, on the basis of: time data stored in a temporary storage part 82 and immediately before a standby mode; time data measured by a clock IC30 immediately before a change-over to an operating mode; and the correction data when a standby mode is changed over to an operating mode, omit the time and labor required to correct time errors by activating a microprocessor 80 at prescribed time intervals when in a standby mode is omitted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a time error correction device and a time error correction method for an electronic timepiece, for example, a technique for correcting a time error caused by temperature characteristics of a crystal resonator.

  Generally, in an electronic timepiece, a crystal resonator that oscillates at a frequency of 32.768 kHz is used. Such a crystal resonator has a temperature characteristic that the oscillation frequency changes due to a temperature change. In particular, there is a characteristic that the frequency change at high temperature and low temperature is larger than the frequency change near normal temperature (25 degrees).

Since the change in frequency directly affects the time error, there is provided a technique for measuring the ambient temperature of the crystal resonator and correcting the time error due to the temperature change (see, for example, Patent Document 1). According to the technique described in Patent Document 1, the time can be corrected based on the relationship between the temperature and the oscillation frequency, and the time error due to the temperature change can be reduced.
JP-A-6-82577

In addition, in order to reduce the power consumption of the electronic timepiece, there is a technique in which these means are stopped except that the temperature measuring means and the time error deriving means are started every certain time (for example, one hour). Provided (for example, see Patent Document 2).
JP 2002-31173 A

  However, in an electronic timepiece provided in an automobile, for example, when the accessory power supply (ACC) is off, the microcomputer that corrects the time error is in a standby state (non-operating state) even if the crystal unit is moving. The time error caused by the temperature change cannot be corrected. In particular, when the automobile is not used for a long time at night or the like, the standby state that cannot be corrected continues for a long time, and the time error of the electronic timepiece increases.

  A method of correcting the time by starting the microcomputer at regular intervals while the microcomputer is in a standby state using the invention described in Patent Document 2 is also conceivable. However, if the microcomputer is started at regular intervals to correct the time, there is a problem that the consumption of backup power increases.

  The present invention has been made to solve such a problem, and an object of the present invention is to enable correction of a time error of an electronic timepiece with low power consumption.

  The present invention has been made to solve such a problem. For example, correction data in which a time at a predetermined interval and a correction value for each time are associated with each other is prepared in advance, and the standby mode is started. Time that occurred during the previous standby mode based on the time immediately before entering standby mode, the time immediately after switching from standby mode to operation mode, and the above correction data when switching to operation mode The correction value for every predetermined time for correcting the error is obtained and the current time is corrected.

  According to the present invention configured as described above, when the standby mode is switched to the operation mode, it is possible to retroactively correct a time error generated during the standby mode using correction data prepared in advance. Therefore, it is not necessary to start the microcomputer at regular intervals during the standby mode to correct the time, and power consumption can be reduced.

(First embodiment)
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of a time error correction device 10 for an electronic timepiece according to the first embodiment. In this embodiment, an example in which an electronic timepiece is provided in an automobile is shown. As shown in FIG. 1, the time error correction device 10 for an electronic timepiece includes a crystal resonator 20, a clock IC 30, a display control unit 40, a time display unit 50, a temperature measurement unit 60, a correction data storage unit 70, and a microprocessor 80. It has.

The crystal resonator 20 is for oscillating a frequency that becomes a reference when measuring the time of the electronic timepiece. For example, a tuning fork type crystal resonator that oscillates at a frequency of 32.768 kHz is used.
The clock IC 30 (corresponding to the time measuring unit of the present invention) incorporates an oscillation circuit, a frequency dividing circuit, and the like (not shown), and generates time data based on a clock signal having a reference frequency supplied from the crystal resonator 20. Generate. The display control unit 40 causes the time display unit 50 to display the time based on the time data supplied from the clock IC 30.

  The temperature measuring unit 60 measures the ambient temperature of the crystal unit 20. The correction data storage unit 70 stores in advance correction data used to correct a time error that occurs when the microprocessor 80 is in the standby mode. Note that the standby mode means that the accessory power supply (ACC) of the automobile is turned off and the main part (other than the standby state detection unit 81) of the microprocessor 80 is in a non-operating state. Even in the standby mode, the crystal resonator 20, the clock IC 30, the display control unit 40, and the time display unit 50 are operated by the backup power source of the automobile, and the time data supplied from the clock IC 30 to the display control unit 40 is used. It is possible to display the time on the time display unit 50. On the other hand, when the accessory power supply is turned on and the microprocessor 80 is also in the operating state, this is called an operation mode.

  Here, the content of the correction data will be described with reference to FIGS. FIG. 2 is a diagram illustrating an example of annual temperature change. FIG. 3 is a diagram illustrating an example of correction data stored in the correction data storage unit 70 for each month. FIG. 2 shows how the in-vehicle temperature changes during one day (24 hours) for each month from January to December. Here, the average temperature change of each month is shown. Such a graph can be obtained as an experience value, for example.

  The correction data is obtained using the graph of FIG. The correction data of the present embodiment is table information configured by associating a time at a predetermined interval (for example, every hour) with a correction value for each time. As can be seen from the graph in FIG. 2, the temperature changes after 1 hour has elapsed. When the temperature changes, the time error measured by the clock IC 30 also changes due to the temperature characteristics of the crystal unit 20. The correction value is set to a value that cancels the changed error amount.

  For example, when the temperature at 11 o'clock in January is t1 degrees, it is assumed from the temperature characteristics of the crystal unit 20 that the time error generated with respect to t1 degrees is + Δe1. Further, it is assumed that it is known from the temperature characteristics of the crystal resonator 20 that when the temperature at 12:00 in January is t2 degrees, the time error generated with respect to t2 degrees is + Δe2. In this case, in one hour from 11:00 to 12:00, the temperature changes from t1 degrees to t2 degrees, and the time error changes from + Δe1 to + Δe2. In this case, the correction value s1 at 12:00 is assumed to be-(Δe2-Δe1).

  Similarly, when the temperature at 13:00 is t3 degrees, it is assumed from the temperature characteristics of the crystal unit 20 that the time error generated with respect to t3 degrees is + Δe3. In this case, in one hour from 12:00 to 13:00, the temperature changes from t2 degrees to t3 degrees, and the time error changes from + Δe2 to + Δe3. In this case, the correction value s2 at 13:00 is − (Δe3−Δe2). Such correction values are obtained every hour, and table information including combinations of the obtained 24 correction values and each time is used as correction data for January. Similarly, correction data for February to December is also generated.

  FIG. 3 shows the correction data generated in this way. Here, the correction data is generated so that the correction value at 12:00 in January is s1, the correction value at 13:00 is s2, and so on. The correction data is generated in advance from the graph of FIG. 2 and the temperature characteristics of the crystal unit 20 and stored in advance in the correction data storage unit 70. The correction data storage unit 70 may be such that data cannot be rewritten, such as a ROM.

  The microprocessor 80 controls the entire time error correction device 10 of the electronic timepiece. In particular, processing for correcting an error in time measured by the clock IC 30 is executed. The microprocessor 80 includes, as its functional configuration, a standby state detection unit 81, a temporary storage unit 82, a time error correction unit 83, and a control unit 84 that controls them.

  The standby state detection unit 81 detects switching between the standby mode and the operation mode of the microprocessor 80 based on the ACC signal received from the accessory power supply.

  The temporary storage unit 82 temporarily stores time data measured by the clock IC 30 immediately before the microprocessor 80 enters the standby mode under the control of the control unit 84. The time error correction unit 83 corrects a time error caused by a temperature change. The time error correction unit 83 does not perform correction when the microprocessor 80 is in the standby mode, but performs correction when the microprocessor 80 is in the operation mode. In particular, when the standby mode is switched to the operation mode, correction specific to the present embodiment is executed.

  The time error correction unit 83 normally calculates a time error corresponding to the temperature based on the temperature data received from the temperature measurement unit 60 every predetermined time (for example, every hour), and corrects the time error. I do. The time error correction unit 83 stores characteristic data representing the temperature characteristic of the time measured by the clock IC 30 or the temperature characteristic of the oscillation frequency of the crystal resonator 20, and receives the characteristic data and the temperature measurement unit 60. Based on the measured temperature data, the time error is calculated and corrected.

  However, when the microprocessor 80 is in the standby mode, the time error correction unit 83 is not working and does not correct the time. Therefore, an error remains in the time data generated by the clock IC 30. Therefore, the time error correction unit 83 of the present embodiment stores the time data received from the clock IC 30 immediately after switching to the operation mode and the temporary storage unit 82 when the standby mode is switched to the operation mode. Based on the time data immediately before entering a certain standby mode and the correction data stored in the correction data storage unit 70, the current time is determined by the correction value at the hourly time when the microprocessor 80 is in the standby mode. Correct the error.

  For example, when the microprocessor 80 is in the standby mode for 3 hours from 11:00 to 14:00 (the time data immediately before entering the standby mode stored in the temporary storage unit 82 is 11:00, and the operation mode is switched to the operation mode. When the time data received from the clock IC 30 immediately after is 14:00), the time error correction unit 83 includes a correction value s1 at 12:00 after 1 hour from 11:00, and a correction value s2 at 13:00 after 1 hour has passed. Further, the total correction value s is obtained by adding all the correction values s3 at 14:00 when one hour has passed (s = s1 + s2 + s3). Then, the current time is corrected by adding the obtained total correction value s to the current time measured by the clock IC 30.

  Since the correction data stored in the correction data storage unit 70 is correction values for every hour, the time immediately before the standby mode stored in the temporary storage unit 82 is stored in the correction data storage unit 70. The exact time may not match. For example, if the time when the standby mode is entered is 11:20, the correction value corresponding to 11:20 is not stored in the correction data storage unit 70. In this case, for example, the correction value is obtained by approximating the time closer to the time when the standby mode is entered among the previous and subsequent times (11 o'clock or 12 o'clock). That is, assuming that the standby mode has been entered at 11:00, the correction value s1 at 12:00 is adopted. When the time data is stored in the temporary storage unit 82, the data of 11 o'clock may be stored even if the time when the mode is actually shifted to the standby mode is 11:20.

  When the standby mode is entered at a time exactly in the middle of the time interval stored in the correction data storage unit 70 such as 11:30, one of the previous and subsequent times (11:00 or 12:00) A correction value is obtained by approximating one of the times. For example, assuming that the standby mode has been entered at 11:00, which is the earlier time, the correction value s1 at 12:00 is adopted.

  Similarly, the time when the operation mode is shifted from the standby mode may not completely match the time stored in the correction data storage unit 70. For example, if the time when the operation mode is entered is 14:10, the correction value corresponding to 14:10 is not stored in the correction data storage unit 70. In this case, for example, the correction value is obtained by approximating the time closer to the time when the operation mode is entered among the times before and after (14:00 or 15:00). That is, assuming that the operation mode has been entered at 14:00, the correction value s3 at 14:00 is adopted.

  As another example, a correction value corresponding to the time when the standby mode is actually entered or the time when the standby mode is exited may be obtained by interpolation calculation. For example, if the time when the standby mode is entered is 12:15, the correction value corresponding to 12:15 is set to the correction value s1 at 12:00 stored in the correction data storage unit 70 and the correction at 13:00. It is obtained by interpolation calculation from the value s2. The interpolation calculation may be linear interpolation or interpolation using a quadratic function or another interpolation function. When linear interpolation is performed in the above example, the correction value at 12:15 is s1 + (s2-s1) / 4.

  The control unit 84 controls operations of the temporary storage unit 82 and the time error correction unit 83. For example, the control unit 84 instructs the time error correction unit 83 to correct the time so that the time is corrected every hour when the microprocessor 80 is in the operation mode. In addition, when the standby state detection unit 81 detects switching from the operation mode to the standby mode, the control unit 84 stores the time data measured by the clock IC 30 immediately before it in the temporary storage unit 82. The control unit 84 instructs the time error correction unit 83 to correct the time when the standby state detection unit 81 detects the switching from the standby mode to the operation mode.

  FIG. 4 is a diagram showing temperature characteristics of the crystal unit 20. FIG. 4A shows characteristics when error correction is not performed, and FIG. 4B shows characteristics when error correction according to the present embodiment is performed. In FIG. 4, the vertical axis represents the frequency error (ΔF / F), and the horizontal axis represents the temperature (° C.). In general, as shown in FIG. 4A, the crystal unit 20 has a frequency-temperature characteristic in which the error is small near normal temperature (25 degrees), but the error increases as the temperature goes away from the normal temperature. . The error at this time is a value close to 200 ppm at the maximum.

  On the other hand, by executing the error correction of the present embodiment, the frequency of the crystal unit 20 is changed with respect to the change in the ambient temperature accompanying the change in the time zone that occurs after the microprocessor 80 switches to the standby mode. As shown in FIG. 4B, the time correction with the error suppressed to 100 ppm or less can be performed when the microprocessor 80 shifts to the operation mode.

  Next, the operation of the time error correction device 10 of the electronic timepiece according to the first embodiment configured as described above will be described. FIG. 5 is a flowchart showing an operation example of time correction by the time error correction device 10 of the electronic timepiece. In FIG. 5, the clock IC 30 generates (counts) time data based on the clock signal of the reference frequency supplied from the crystal resonator 20 (step S1). The generated time data is sent to the display control unit 40. The display control unit 40 that has received the time data displays the time on the time display unit 50 (step S2).

  Here, the control unit 84 determines whether or not one hour has elapsed since the previous time correction was performed by the time error correction unit 83 (step S3). When it is determined that one hour has elapsed since the time correction is performed, the control unit 84 instructs the time error correction unit 83 to correct the time. Thereby, the time error correction unit 83 reads the temperature data measured by the temperature measurement unit 60 (step S4). Then, based on the read temperature data and the characteristic data representing the temperature characteristic, the time error corresponding to the measured temperature is calculated, and the time is corrected (step S5).

  The corrected time data is sent to the clock IC 30 by the control unit 84. The clock IC 30 resets the time using the corrected time data. Further, the clock IC 30 supplies the corrected time data to the display control unit 40. The display control unit 40 that has received the corrected time data displays the corrected time on the time display unit 50 (step S6), and returns to the process of step S1.

  On the other hand, if it is determined in step S3 that one hour has not yet elapsed since the previous time correction, the standby state detection unit 81 determines whether or not the accessory power supply is turned off. It is determined whether or not the processor 80 can be switched from the operation mode to the standby mode (step S7). If it is determined that the standby mode cannot be switched, the process returns to step S1. On the other hand, when it is determined that the standby mode can be switched, the standby state detection unit 81 notifies the control unit 84 of the fact. In response to this, the control unit 84 stores the time data received from the clock IC 30 immediately before entering the standby mode in the temporary storage unit 82 (step S8).

  Thereafter, the microprocessor 80 is switched to the standby mode, but the clock IC 30 continues to generate (count) time data based on the clock signal of the reference frequency supplied from the crystal resonator 20 (step S9). The generated time data is sent to the display control unit 40. Receiving this, the display control unit 40 displays the time on the time display unit 50 (step S10).

  At this time, the standby state detection unit 81 determines whether or not switching from the standby mode to the operation mode is performed according to whether or not the accessory power source is turned on (step S11). If switching to the operation mode is not detected, the process proceeds to step S9. On the other hand, when it is determined that the operation mode has been switched, the standby state detection unit 81 notifies the control unit 84 of the fact. In response to this, the control unit 84 sends the time data received from the clock IC 30 immediately after switching to the operation mode and the time data immediately before entering the standby mode stored in the temporary storage unit 82 to the time error correction unit 83. Send and instruct to correct the time. Upon receiving this instruction, the time error correction unit 83 corrects the current time using the correction data stored in the correction data storage unit 70 (step S12), and returns to the process of step S1.

  As described above in detail, according to the first embodiment, when the microprocessor 80 switches from the standby mode to the operation mode, the time generated during the standby mode using the correction data prepared in advance. Can be corrected retroactively. For this reason, it is not necessary to start the microprocessor 80 at regular intervals during the standby mode to perform correction, and it is possible to reduce the power consumption necessary for correcting the time error.

(Second Embodiment)
Next, a second embodiment according to the present invention will be described. In the first embodiment described above, table information in which the time at each predetermined interval and the correction value for each time are associated is stored in the correction data storage unit 70 as correction data, and such correction data and An example in which correction is performed using the time immediately before entering the standby mode and the time immediately after switching to the operation mode has been described. On the other hand, in the second embodiment, table information in which a temperature for each predetermined time interval and a correction value for each temperature are associated with each other is stored in advance as correction data. Correction is performed using the temperature measured immediately before entering the mode and the temperature measured immediately after switching to the operation mode.

  FIG. 6 is a diagram illustrating a configuration example of the time error correction device 10 of the electronic timepiece according to the second embodiment. In FIG. 6, components having the same reference numerals as those shown in FIG. 1 have the same functions, and thus redundant description is omitted here. In the second embodiment, the content of the correction data stored in the correction data storage unit 90 is different from the content of the correction data stored in the correction data storage unit 70 in the first embodiment. The contents of data stored in the temporary storage unit 85 and the operations performed by the time error correction unit 86 and the control unit 87 are different from those of the first embodiment.

  FIG. 7 is a diagram illustrating an example of correction data stored in the correction data storage unit 90. This correction data is also obtained using the graph of FIG. The correction data of the second embodiment is table information configured by associating a temperature for each predetermined time interval (for example, every hour) with a correction value for each temperature. As can be seen from the graph in FIG. 2, the temperature changes after 1 hour has elapsed. When the temperature changes, the time error measured by the clock IC 30 also changes due to the temperature characteristics of the crystal unit 20. The correction value is set to a value that cancels the changed error amount.

  For example, when the temperature at 11 o'clock in January is t1 degrees, it is assumed from the temperature characteristics of the crystal unit 20 that the time error generated with respect to t1 degrees is + Δe1. Further, it is assumed that it is known from the temperature characteristics of the crystal resonator 20 that when the temperature at 12:00 in January is t2 degrees, the time error generated with respect to t2 degrees is + Δe2. In this case, in one hour from 11:00 to 12:00, the temperature changes from t1 degrees to t2 degrees, and the time error changes from + Δe1 to + Δe2. In this case, the correction value s1 for the temperature t2 at 12:00 is − (Δe2−Δe1).

  Similarly, when the temperature at 13:00 is t3 degrees, it is assumed from the temperature characteristics of the crystal unit 20 that the time error generated with respect to t3 degrees is + Δe3. In this case, in one hour from 12:00 to 13:00, the temperature changes from t2 degrees to t3 degrees, and the time error changes from + Δe2 to + Δe3. In this case, the correction value s2 of the temperature t3 at 13:00 is − (Δe3−Δe2). Such correction values are obtained every hour, and table information including combinations of the obtained 24 correction values and respective temperatures is used as January correction data. Similarly, correction data for February to December is also generated.

  FIG. 7 shows the correction data generated in this way. Here, the correction data is generated so that the correction value for temperature t1 in January is s0, the correction value for temperature t2 is s1, the correction value for temperature t3 is s2,. This correction data is generated in advance from the graph of FIG. 2 and the temperature characteristics of the crystal unit 20 and stored in the correction data storage unit 90 in advance. The correction data storage unit 90 may be a unit that cannot rewrite data, such as a ROM.

  The control unit 87 controls the operations of the temporary storage unit 85 and the time error correction unit 86. For example, the control unit 87 instructs the time error correction unit 86 to correct the time so that the time is corrected every hour when the microprocessor 80 is in the operation mode. Further, when the standby state detection unit 81 detects the switching from the operation mode to the standby mode, the control unit 87 stores the temperature data measured by the temperature measurement unit 60 immediately before it in the temporary storage unit 82. Further, the control unit 84 instructs the time error correction unit 86 to correct the time when the standby state detection unit 81 detects the switching from the standby mode to the operation mode.

  The time error correction unit 86 normally calculates a time error corresponding to the temperature based on the temperature data received from the temperature measurement unit 60 every predetermined time (for example, every hour), and corrects the time error. I do. This operation is the same as in the first embodiment.

  The time error correction unit 87 stores the temperature data measured by the temperature measurement unit 60 immediately after switching to the operation mode and the temporary storage unit 85 when the standby mode is switched to the operation mode. Based on the temperature data immediately before entering the standby mode and the correction data stored in the correction data storage unit 90, the current time is determined by the correction value for the temperature change every hour when the microprocessor 80 is in the standby mode. Correct the error.

  For example, when the temperature data immediately before entering the standby mode stored in the temporary storage unit 85 is t1, and the temperature data measured by the temperature measurement unit 60 immediately after switching to the operation mode is t3, the time error correction unit 86 calculates the total correction value s by adding all the correction value s1 for the temperature t2 changed 1 hour after the temperature t1 and the correction value s2 for the temperature t3 changed 1 hour later (s = s1 + s2). Then, the current time is corrected by adding the obtained total correction value s to the current time measured by the clock IC 30.

  The temperature stored as correction data in the correction data storage unit 90 is based on experience values, and is stored as a temperature every hour. Therefore, the temperature immediately before entering the standby mode stored in the temporary storage unit 85 may not completely match the temperature stored in the correction data storage unit 90. In this case, for example, the correction value is obtained by approximating the temperature closest to the temperature when the standby mode is entered among the 24 temperatures stored in the correction data storage unit 90.

  Similarly, the temperature when shifting from the standby mode to the operation mode may not completely match the temperature stored in the correction data storage unit 90. Also in this case, for example, the correction value is obtained by approximating the temperature closest to the temperature when the operation mode is shifted from the standby mode among the 24 temperatures stored in the correction data storage unit 90.

  As can be seen from the graph of FIG. 2, if there are two or more time zones where the same temperature is reached in 24 hours, the temperature alone cannot be used to uniquely identify the time zone. In some cases, the correction value corresponding to the temperature cannot be obtained. Therefore, the correction data is configured by associating the temperature and time at predetermined time intervals (for example, every hour) with the correction value for each temperature, and the temperature data and time data when the standby mode is entered. The set is stored in the temporary storage unit 85, and the temperature data and time data are also acquired as a set when the standby mode is shifted to the operation mode. Then, it is preferable to obtain a correction value from the correction data using a set of temperature data and time data.

  In this case, when the time error correction unit 86 includes a plurality of temperatures measured by the temperature measurement unit 60 immediately after switching to the operation mode in the correction data stored in the correction data storage unit 90, Immediately after switching to the operation mode, an error in the current time is corrected using a correction value for the temperature closer to the current time measured by the clock IC 30.

  As described above in detail, in the second embodiment, when the microprocessor 80 switches from the standby mode to the operation mode, the temperature immediately before entering the standby mode and the temperature immediately after switching to the operation mode are set. It is possible to retroactively correct time errors that occur during the standby mode based on correction data prepared in advance. As a result, as in the first embodiment, it is not necessary to start the microprocessor 80 at regular intervals during the standby mode to perform correction, and power consumption during standby can be reduced.

In the first and second embodiments, the example using the correction data storing the correction value every other hour has been described, but the time interval is not limited to this.
In the first and second embodiments, an example of a device that corrects a time error of an electronic timepiece mounted on a car has been described. However, the electronic timepiece is not limited to that mounted on a car.
Moreover, although the said embodiment demonstrated the example using the crystal resonator 20, a resonator is not limited to a crystal.

  In the first embodiment, the correction data is configured by associating the time for each predetermined interval with the correction value for each time, and in the second embodiment, the temperature for each predetermined time interval and each of the correction data. Although an example in which correction data is configured in association with a correction value for temperature has been described, the present invention is not limited to this. For example, based on the graph of FIG. 2, table information in which the time at each predetermined interval and the temperature for each time are associated with each other, the temperature characteristic of the time measured by the clock IC 30 or the temperature characteristic of the oscillation frequency of the crystal resonator 20. The correction data may be configured by a combination with characteristic data representing. In this case, the temperature is identified from the time by referring to the table information, and based on the temperature and the above-described temperature characteristic data, the error at the time for each predetermined interval when in the standby mode is estimated. Correct the current time error.

According to the first embodiment or the second embodiment described above, the time error correction units 83 and 86 can immediately obtain the correction value from the table information as shown in FIG. 3 or FIG. The calculation for calculating the error amount at each time based on the temperature characteristic data from the temperature specified by reference can be omitted. Thereby, the processing load performed by the time error correction units 83 and 86 can be reduced.

  In addition, each of the first and second embodiments described above is merely an example of a specific example for carrying out the present invention, and the technical scope of the present invention should not be interpreted in a limited manner. It will not be. In other words, the present invention can be implemented in various forms without departing from the spirit or main features thereof.

It is a figure which shows the structural example of the time error correction apparatus of the electronic timepiece by 1st Embodiment. It is a figure which shows the example of an annual temperature change. It is a figure which shows the example of the correction data memorize | stored in the correction data memory | storage part by 1st Embodiment. It is a figure which shows the temperature characteristic of the oscillation frequency of a crystal oscillator. It is a flowchart which shows the operation example of the time error correction apparatus of the electronic timepiece by 1st Embodiment. It is a figure which shows the structural example of the time error correction apparatus of the electronic timepiece by 2nd Embodiment. It is a figure which shows the example of the correction data memorize | stored in the correction data memory | storage part by 2nd Embodiment.

Explanation of symbols

10 Time error correction device for electronic timepiece 20 Crystal resonator 30 Clock IC
40 Display control unit 50 Time display unit 60 Temperature measurement unit 70, 90 Correction data storage unit 80 Microprocessor 81 Standby state detection unit 82, 85 Temporary storage unit 83, 86 Time error correction unit 84, 87 Control unit

Claims (6)

A time measuring unit for measuring time;
A time error correction unit that corrects an error in time measured by the time measurement unit;
A standby state detection unit for detecting switching between the standby mode and the operation mode of the time error correction unit;
A temporary storage unit that temporarily stores the time measured by the time measurement unit immediately before entering the standby mode;
A correction data storage unit for storing correction data used for correction of time error by the time error correction unit, the correction data having table information in which a time at a predetermined interval and a correction value for each time are associated with each other; With
The time error correction unit is measured by the time measurement unit immediately after switching to the operation mode when the standby state detection unit detects that the standby mode has been switched to the operation mode. And the time when the standby mode was entered based on the time immediately before entering the standby mode stored in the temporary storage unit and the correction data stored in the correction data storage unit. An apparatus for correcting a time error of an electronic timepiece, wherein an error of a current time is corrected by a correction value at a time every predetermined interval. A time measuring unit for measuring time;
A temperature measuring unit for measuring the temperature;
A time error correction unit that corrects an error in time measured by the time measurement unit;
A standby state detection unit for detecting switching between the standby mode and the operation mode of the time error correction unit;
A temporary storage unit that temporarily stores the temperature measured by the temperature measurement unit immediately before entering the standby mode;
A correction data storage unit storing correction data used for correcting time errors by the time error correction unit, the correction data having table information in which a temperature for each predetermined time interval and a correction value for each temperature are associated with each other And
The time error correction unit is measured by the temperature measurement unit immediately after switching to the operation mode when the standby state detection unit detects that the standby mode has been switched to the operation mode. Based on the temperature immediately before entering the standby mode stored in the temporary storage unit and the correction data stored in the correction data storage unit, An apparatus for correcting a time error of an electronic timepiece, wherein an error of a current time is corrected by a correction value for temperature at every predetermined time interval.   The time error correction unit, when there are a plurality of temperatures measured by the temperature measurement unit immediately after switching to the operation mode in the correction data stored in the correction data storage unit, 3. The error of the current time is corrected using a correction value for the temperature closer to the current time measured by the time measuring unit immediately after switching to the operation mode. The time error correction apparatus of the electronic timepiece described. The temporary storage unit temporarily stores the time measured by the time measurement unit immediately before entering the standby mode, in addition to the temperature measured by the temperature measurement unit immediately before entering the standby mode,
The time error correction unit is configured to store the temporary storage when the correction data stored in the correction data storage unit includes a plurality of temperatures immediately before the standby mode stored in the temporary storage unit. 3. The time error correction device for an electronic timepiece according to claim 2, wherein the current time error is corrected using a correction value for a temperature closer to the time stored in the unit. A time measuring unit for measuring time;
A time error correction unit that corrects an error in time measured by the time measurement unit;
A standby state detection unit for detecting switching between the standby mode and the operation mode of the time error correction unit;
A temporary storage unit that temporarily stores the time measured by the time measurement unit immediately before entering the standby mode;
Correction data used for time error correction by the time error correction unit, table information in which a time at a predetermined interval is associated with a temperature for each time, and temperature characteristics of the vibrator used by the time measurement unit. A correction data storage unit storing correction data having characteristic data to represent,
The time error correction unit is measured by the time measurement unit immediately after switching to the operation mode when the standby state detection unit detects that the standby mode has been switched to the operation mode. And the time when the standby mode was entered based on the time immediately before entering the standby mode stored in the temporary storage unit and the correction data stored in the correction data storage unit. An apparatus for correcting a time error of an electronic timepiece, wherein an error at a predetermined interval is estimated to correct an error at a current time. The time measuring unit immediately before the time error correcting unit enters the standby mode when the switching from the operation mode to the standby mode of the time error correcting unit for correcting the time error measured by the time measuring unit is detected. A first step of storing in a temporary storage unit the time measured by
When it is detected that the time error correction unit has switched from the standby mode to the operation mode, the time measured by the time measurement unit immediately after switching to the operation mode, and the temporary storage unit Correction data stored in advance in the standby mode and correction data stored in advance in the correction data storage unit, which associates a time at a predetermined interval with a correction value for each time And a second step of correcting an error of the current time with a correction value at the time of each predetermined interval when in the standby mode, based on .