JP5579113B2 - Radio wave watch - Google Patents

Description

  The present invention relates to a radio-controlled wristwatch that corrects time based on radio waves received from an external time information supply source.

  There is a wristwatch that operates by a battery voltage supplied by a built-in battery. In such a wristwatch, when the battery voltage is lowered, there is a case where a high load process is hindered (see, for example, Patent Document 1). In view of this, when the battery voltage is lowered, it is conceivable to display a warning by, for example, a 2-second hand movement.

JP 2006-337380 A

  Among wrist watches, there is a radio wristwatch that receives a radio wave including time information from an external time information supply source (for example, a GPS satellite) and corrects the time. In such a radio wristwatch, the battery voltage may temporarily decrease when radio wave reception processing is performed. In this case, the battery voltage drop is temporary, but if the above warning is displayed even when such battery voltage drop occurs, the user misunderstands that there is a problem with the battery. There is a risk of causing. Further, some functions of the wristwatch are limited until the warning display is canceled, and it may be impossible to use.

  The present invention has been made in consideration of the above problems, and one of its purposes is a radio-controlled wristwatch capable of avoiding unnecessary warning display when it has a warning display function for warning of a decrease in battery voltage. Is to provide.

  The radio-controlled wristwatch according to the present invention includes a radio wave receiving unit that receives radio waves including time information, a time display unit that displays time according to the time information included in the received radio waves, and a voltage of a built-in battery is reduced. Voltage warning display means for displaying a warning for the voltage drop, and the voltage warning display means until the predetermined condition is satisfied after the reception processing by the radio wave reception means ends. It is characterized by limiting the display of warnings.

  In the radio wristwatch, the voltage warning display means may determine a period for limiting the display of the warning according to the type of reception processing executed by the radio wave reception means.

  In the radio wristwatch, the voltage warning display unit may determine a period for limiting the display of the warning according to a time required for the radio wave reception unit to execute the reception process.

  In the radio wristwatch, the voltage warning display unit may limit the display of the warning when the reception process is successful, and may not limit the display of the warning when the reception process fails.

  Further, in the radio-controlled wristwatch, the voltage warning display means performs a display of a type different from the warning display when the reception process is not performed as the warning display when the reception process fails. It is good.

  In the radio wristwatch, when the radio wave receiving unit receives an instruction to receive the radio wave from a user in a state where the battery voltage is reduced below a predetermined threshold, the battery voltage is equal to or higher than the predetermined threshold. It is also possible to wait for the recovery to occur before executing the reception process according to the instruction.

  The radio wristwatch further includes a temperature sensor for detecting the temperature of the battery, and the voltage warning display means determines a period for limiting the display of the warning according to the temperature detected by the temperature sensor. Also good.

  In the radio wristwatch, the voltage warning display means displays the warning when the voltage of the battery drops below a predetermined threshold, and after the reception processing by the radio wave reception means is completed, The warning display may be limited until the voltage recovers to the predetermined threshold or more.

  Further, in the radio wristwatch, the voltage warning display means acquires the value of the battery voltage at the end of the reception process by the radio wave reception means, and displays the warning according to the acquired voltage value. It is good also as determining the period to restrict | limit.

  In the radio-controlled wristwatch, the voltage warning display means displays the warning when the voltage of the battery drops below a predetermined threshold when the reception process is not performed, and ends the reception process. Thereafter, the warning display may be limited by displaying the warning only when the voltage of the battery drops below a limit threshold smaller than the predetermined threshold.

  According to the present invention, since the warning display that warns of a decrease in the battery voltage is suppressed until the predetermined condition is satisfied after the reception of the radio wave including the time information is completed, there is no problem in the battery. In such a case, it is possible to prevent a warning regarding the battery voltage from being displayed.

It is a top view which shows an example of the external appearance of the radio-controlled wristwatch which concerns on embodiment of this invention. It is a block diagram showing the internal configuration of the radio-controlled wristwatch according to the embodiment of the present invention. It is a functional block diagram which shows the function which the radio wave wristwatch which concerns on embodiment of this invention implement | achieves. It is a figure which shows the change of the battery voltage accompanying a reception process. It is a figure which shows the change of the battery voltage when the receiving process is performed a plurality of times. It is a figure which shows the warning limitation period set according to each of the reception processing from which required time differs. It is a flowchart which shows an example of the flow of a process which sets a warning time limit. It is a flowchart which shows an example of the flow of the process which the radio wave wristwatch which concerns on embodiment of this invention performs. It is a flowchart which shows another example of the flow of the process which the radio wave wristwatch which concerns on embodiment of this invention performs. It is a top view which shows an example of the external appearance of the radio-controlled wristwatch which concerns on embodiment of this invention. It is an enlarged view of the state display needle | hook in FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  The radio-controlled wristwatch 1 according to the present embodiment receives a radio wave including time information, and corrects the time measured by itself using the time information included in the received radio wave. FIG. 1 is a plan view showing an example of the appearance of the radio-controlled wristwatch 1 according to the present embodiment, and FIG. 2 is a block diagram showing the internal configuration of the radio-controlled wristwatch 1. As shown in these drawings, the radio-controlled wristwatch 1 includes an antenna 10, a receiving circuit 20, a control circuit 30, a secondary battery 40, a battery voltage detection unit 41, a switch 42, a solar battery 43, The temperature sensor 44, the drive mechanism 50, the time display part 51, and the operation part 60 are comprised.

  The antenna 10 receives a satellite signal transmitted from a satellite as a radio wave including time information. In particular, in the present embodiment, the antenna 10 is a patch antenna that receives a radio wave having a frequency of about 1.6 GHz transmitted from a GPS (Global Positioning System) satellite. GPS is a kind of satellite positioning system, and is realized by a plurality of GPS satellites orbiting around the earth. Each of these GPS satellites is equipped with a high-accuracy atomic clock, and periodically transmits a satellite signal including time information measured by the atomic clock.

  The receiving circuit 20 decodes the satellite signal received by the antenna 10 and outputs a bit string (received data) indicating the contents of the satellite signal obtained as a result of the decoding. Specifically, the receiving circuit 20 includes a high frequency circuit (RF circuit) 21 and a decoding circuit 22.

  The high-frequency circuit 21 is an integrated circuit that operates at a high frequency, and amplifies and detects an analog signal received by the antenna 10 to convert it into a baseband signal. The decoding circuit 22 is an integrated circuit that performs baseband processing, decodes the baseband signal output from the high-frequency circuit 21, generates a bit string indicating the content of data received from the GPS satellite, and outputs the bit string to the control circuit 30. Output.

  The control circuit 30 is a microcomputer or the like, and includes a calculation unit 31, a ROM (Read Only Memory) 32, a RAM (Random Access Memory) 33, an RTC (Real Time Clock) 34, a motor drive circuit 35, It is comprised including.

  The calculation unit 31 performs various types of information processing according to programs stored in the ROM 32. Details of the processing executed by the calculation unit 31 in the present embodiment will be described later. The RAM 33 functions as a work memory of the calculation unit 31 and data to be processed by the calculation unit 31 is written. In particular, in this embodiment, a bit string (received data) representing the contents of the satellite signal received by the receiving circuit 20 is sequentially written in the buffer area in the RAM 33. The RTC 34 supplies a clock signal used for timing in the radio wristwatch 1. In the radio-controlled wristwatch 1 according to the present embodiment, the calculation unit 31 corrects the internal time measured by the signal supplied from the RTC 34 based on the satellite signal received by the reception circuit 20, and displays the time on the time display unit 51. The time to be displayed (display time) is determined. Further, the motor drive circuit 35 outputs a drive signal for driving a motor included in the drive mechanism 50 described later according to the determined display time. As a result, the display time generated by the control circuit 30 is displayed on the time display unit 51.

  The secondary battery 40 is a lithium ion battery or the like, and stores the electric power generated by the solar battery 43. Then, the accumulated power is supplied to the receiving circuit 20 and the control circuit 30. The battery voltage detection unit 41 includes, for example, a resistor. The control circuit 30 detects the voltage of the secondary battery 40 (hereinafter referred to as battery voltage) by a method such as measuring the current flowing from the secondary battery 40 to the battery voltage detection unit 41.

  A switch 42 is provided in the middle of the power supply path from the secondary battery 40 to the receiving circuit 20. The switch 42 is turned on / off by a control signal output from the control circuit 30. When the control circuit 30 switches on / off of the switch 42, the operation timing of the receiving circuit 20 is controlled. The receiving circuit 20 operates only while power is supplied from the secondary battery 40 via the switch 42, and decodes the satellite signal received by the antenna 10 during that time.

  The solar battery 43 is disposed under the dial 53, generates power with external light such as sunlight irradiated on the radio-controlled wristwatch 1, and supplies the generated power to the secondary battery 40.

  The temperature sensor 44 is disposed in the radio-controlled wristwatch 1, detects the temperature around the secondary battery 40, and inputs the detection result to the control circuit 30. For example, when the temperature is outside a predetermined range, the control circuit 30 performs control to limit charging of the secondary battery 40 using the detection result of the temperature by the temperature sensor 44.

  The drive mechanism 50 includes a step motor that operates in accordance with the drive signal output from the motor drive circuit 35 described above and a train wheel, and the train wheel transmits the rotation of the step motor, thereby indicating the pointer. 52 is rotated. The time display unit 51 includes a pointer 52 and a dial 53. The pointer 52 includes an hour hand 52a, a minute hand 52b, and a second hand 52c, and when the pointer 52 rotates on the dial 53, the current time is displayed. On the dial 53, not only a scale for displaying the time but also a marker for indicating to the user whether or not the time information has been received may be displayed.

  The operation unit 60 is, for example, a crown or an operation button, and receives an operation by the user of the radio wave wristwatch 1 and outputs the operation content to the control circuit 30. The control circuit 30 executes various processes according to the contents of the operation input received by the operation unit 60. In particular, in the present embodiment, the control circuit 30 performs radio wave reception processing in response to an operation input to the operation unit 60 by the user.

  Hereinafter, a specific example of processing executed by the calculation unit 31 of the control circuit 30 in the present embodiment will be described. The calculation unit 31 functionally implements a satellite signal reception unit 31a, a time correction unit 31b, and a voltage warning display unit 31c as shown in FIG. 3 by executing a program stored in the ROM 32. To do.

  The satellite signal receiving unit 31a receives the satellite signal transmitted from the GPS satellite, thereby acquiring time information data included therein. The satellite signal receiving unit 31a may periodically execute such time information acquisition processing, or may execute these processing in response to an instruction operation on the operation unit 60 by the user. In addition, the radio wristwatch 1 may determine the reception timing of the satellite signal according to its own radio wave reception environment (signal strength or the like). In particular, when radio wave reception processing is performed according to a user's instruction operation, the satellite signal reception unit 31a may display the reception result (whether the reception processing has been successful). In this case, the satellite signal reception unit 31a uses whether or not the reception process has been successful by, for example, rotating the second hand 52c to indicate any of the markers indicating success or failure of the reception arranged on the dial 53. Present to the person.

  The time correction unit 31b corrects the internal time counted inside the radio wristwatch 1 using information received from the GPS satellite by the satellite signal reception unit 31a.

  The voltage warning display unit 31c displays a warning to warn the user when the battery voltage has dropped. Specifically, the voltage warning display unit 31c periodically measures the battery voltage by the battery voltage detection unit 41, and displays a warning when the measurement result falls below a predetermined threshold value Vth. The voltage warning display unit 31c can perform warning display by various methods, for example, by irregularly moving the time indicating hand 52 or by using a state displaying hand. In the following, as an example, the voltage warning display unit 31c displays a warning indicating that the battery voltage has decreased by moving the second hand 52c for 2 seconds (moving the second hand 52c by 2 seconds every 2 seconds). By performing such a warning display, when the secondary battery 40 needs to be charged, the radio-controlled wristwatch 1 can inform the user accordingly.

  Furthermore, in the present embodiment, the voltage warning display unit 31c limits the above-described warning display until a predetermined condition is satisfied after the satellite signal reception processing by the satellite signal reception unit 31a is completed. This is due to the following reasons. During the reception process, the reception circuit 20 operates and a large current flows from the secondary battery 40. Therefore, the battery voltage temporarily decreases during and immediately after the execution of the reception process. FIG. 4 is a graph showing changes in the battery voltage associated with such reception processing, where the horizontal axis indicates the passage of time and the vertical axis indicates the magnitude of the battery voltage. Also, times t0 and t1 indicate the start timing and end timing of the reception process, respectively. As shown in the figure, the battery voltage decreases to a value lower than the threshold value Vth along with the reception process, but such a decrease in the battery voltage is temporary, and usually after the reception process is finished, As time passes, the battery voltage again exceeds the threshold value Vth and recovers to near the level before the start of reception. Note that time t2 in FIG. 4 indicates the timing at which the battery voltage recovers to the threshold value Vth after the reception process. If a warning is displayed even when the battery voltage temporarily decreases due to such a reception process, the battery voltage is not shown to the user even though there is no problem with the battery voltage. A display as if it is necessary to deal with the decrease in the image is displayed. In particular, when the secondary battery 40 is a lithium ion battery, it takes a relatively long time to recover the battery voltage. Further, when the warning display continues for a certain time even when the battery voltage recovers, there is a possibility that high load processing such as re-receiving processing is restricted for a certain time each time the receiving processing is executed. Therefore, the voltage warning display unit 31c limits the battery voltage decrease warning display for at least a period from when the reception process is completed until a predetermined condition is satisfied. Hereinafter, the period during which the warning display is restricted is referred to as a warning restriction period.

  Specifically, the voltage warning display unit 31c may not always display a warning regardless of the value of the battery voltage during the warning limit period. Alternatively, until the end of the warning restriction period, the threshold value that serves as a determination criterion for displaying a warning may be changed to a restriction threshold value Vth2 that is lower than the normal threshold value Vth. As shown in FIG. 4, the threshold value Vth2 at the time of restriction in this case is set to a value lower than the value of the battery voltage when temporarily lowered by the normal reception process. In this way, even if the battery voltage is reduced to a value (a value less than Vth) at which a warning is displayed in normal time, the warning can be prevented from being displayed during the warning limit period. On the other hand, when the battery voltage drops to a value exceeding the temporary drop accompanying the reception process (less than Vth2), a warning can be displayed even during the warning limit period.

  Hereinafter, some examples of the method for determining the end timing of the warning restriction period will be described. The voltage warning display unit 31c may set a warning limit period from the end of the reception process until a predetermined time elapses. Further, in this example, when the reception process is executed again by the satellite signal receiving unit 31a before the warning restriction period ends, the time until the predetermined time elapses from the end of the last reception process. It may be a warning limit period. FIG. 5 shows the time change of the battery voltage in this case. In this figure, the first reception process started at time t0 ends at time t1, and at that time time t3 is determined as the end timing of the warning restriction period. However, before time t3 arrives, the second reception process starts at time t4 and ends at time t5. At this time, time t6 is determined as the end timing of the new warning restriction period. In this example, after the end of the reception process, it may be displayed whether the previous reception process was successful within the warning restriction period.

  Or the voltage warning display part 31c is good also considering time until a battery voltage recovers more than the predetermined value (for example, threshold value Vth) as a warning limitation period. In this example, when the predetermined value is the threshold value Vth, the time t2 in FIG. 4 is the end timing of the warning restriction period. In this example as well, an upper limit value (maximum time) of the warning limit period may be determined in advance in preparation for a case where the battery voltage continues to decrease. In this case, the warning display is limited until the maximum time elapses or until the battery voltage recovers to a predetermined value or more.

  Further, the voltage warning display unit 31 c may change the length of the warning limit period according to the temperature detection result by the temperature sensor 44. Since the charge / discharge characteristics of the secondary battery 40 change depending on the temperature, the warning restriction period can be optimized by determining the end timing of the warning restriction period according to the temperature at the start of the reception process.

  In addition, the voltage warning display unit 31c may change the length of the warning limit period according to the content of the reception process executed by the satellite signal receiving unit 31a. The satellite signal reception unit 31a performs reception processing not only for acquiring time information but also for other purposes. Specifically, when receiving a satellite signal from a GPS satellite, reception processing is executed in advance to capture the satellite signal from the GPS satellite before receiving time information. In addition, the GPS time transmitted by the GPS satellite has a shift due to leap seconds relative to the coordinated universal time, and the GPS satellite also transmits leap second information for correcting this shift. Therefore, the radio-controlled wristwatch 1 receives not only the time information but also the leap second information from the GPS satellite. The time information transmitted by the GPS satellite includes the TOW (Time Of Week) indicating the current time starting from the beginning of the week (Sunday 0:00 am) and the current week from the predetermined reference time. And a week number WN indicating that. Therefore, the radio-controlled wristwatch 1 may receive only the TOW depending on the case, or may receive the TOW and the week number WN together. That is, the satellite signal receiving unit 31a performs a receiving process for capturing a GPS satellite, a receiving process for only the TOW, a receiving process for the TOW and the week number WN, a receiving process for acquiring leap second information, and the like. Depending on the type of reception process (reception mode), the processing time required for the reception process and the processing load during the reception process also change, so that the current consumption also differs. Therefore, when the satellite signal receiving unit 31a executes the receiving process, the voltage warning display unit 31c receives information indicating the type of the receiving process from the satellite signal receiving unit 31a, and the warning limit period according to the type of the receiving process. The end timing of is determined. In this way, the warning limit period can be optimized for each type of reception process.

  The voltage warning display unit 31c may determine the length of the warning limit period according to the time required for the satellite signal reception unit 31a to execute the reception process. The time required for the reception processing is the time from time t0 (reception processing start timing) to time t1 (reception processing end timing) in FIG. 4, and this time depends on the type of reception processing described above. Will change. The longer the time required for the reception process is, the more the battery voltage decreases during that time. Therefore, it is estimated that it takes time to recover the battery voltage. Therefore, the voltage warning display unit 31c counts the time required for the reception process by receiving notifications from the satellite signal reception unit 31a at the start and end timings of the reception process. Then, the end timing of the warning restriction period is determined so that the warning restriction period becomes longer as the counted time required for the reception process becomes longer. Thereby, the length of the warning limit period can be optimized. FIG. 6 is a diagram showing warning limit periods set according to reception processes having different required times when a warning limit period is set using such a method. In the figure, the solid line shows the time change of the battery voltage when the reception process for a relatively short time (for example, the reception process only for TOW) is performed, and the period T1 from time t0 to time t1 is the reception process. The required time is shown as a warning restriction period in which a period T2 from time t1 to time t3 is determined according to this period T1. A broken line indicates a change in battery voltage over time when reception processing for a relatively long time (for example, reception processing for both TOW and week number WN) is performed, and a period T3 from time t0 to time t1 ′. Indicates the time required for the reception process, and the warning limit period in which the period T4 from the time t1 'to the time t3' is determined according to the period T3. As can be seen from this figure, the length of the warning limit period to be set is in a relationship of T2 <T4 in accordance with T1 <T3. The voltage warning display unit 31c may determine the length of the warning limit period in consideration of both the type of reception processing and the required time. For example, the voltage warning display unit 31c gives a warning by adding or subtracting a correction value determined according to the length of time required for the reception process with respect to a reference value predetermined for each type of reception process. The length of the limit period may be determined. FIG. 7 shows a processing flow in this case. As shown in the figure, the voltage warning display unit 31c first acquires information indicating the type of reception processing from the satellite signal reception unit 31a at the start of reception processing by the satellite signal reception unit 31a (S101). Thereafter, by counting the required time during the execution of the reception process by the satellite signal receiving unit 31a, a count value of the required time is obtained at the end of the reception process (S102). Then, the voltage warning display unit 31c determines the end timing t3 of the warning limit period based on the information acquired in each of S101 and S102 (S103). Note that, as described above, the voltage warning display unit 31c may determine the end timing t3 of the warning limit period based only on the type of reception processing or only the count value of the time required for reception processing.

  In addition, the voltage warning display unit 31c detects the battery voltage by the battery voltage detection unit 41 at the end timing of the reception process, and determines the length of the warning limitation period according to the detected battery voltage value. Good. In this case, the lower the battery voltage value at the end of the reception process, the longer it takes to recover the battery voltage, so the end timing of the warning restriction period is determined so that the warning restriction period becomes longer.

  Further, the voltage warning display unit 31c may change whether or not to limit the warning display depending on whether or not the satellite signal reception unit 31a has succeeded in the reception process. Here, the success of the reception process means that the reception of information (time information, leap second information, etc.) that is the object of the reception process is completed. In particular, when time information reception processing is executed according to the user's instruction operation, if the reception processing is successful, there will be no problem even if the battery voltage temporarily decreases. Restrictions may be made. On the other hand, when the reception process fails and a message to that effect is displayed, the user may instruct the execution of the reception process again. However, since a large current consumption is required for the reception process as described above, the reception process cannot be executed again while the battery voltage is decreasing. Therefore, when the reception process fails, it is necessary to indicate to the user that the battery voltage has decreased due to the reception process and that the reception process cannot be executed until the battery voltage is restored.

  An example of a specific processing flow when changing whether or not to limit the warning display according to the result of the reception processing will be described with reference to the flowchart of FIG.

  When there is an instruction for reception processing from the user, the satellite signal reception unit 31a first determines whether or not the battery voltage is greater than or equal to a predetermined value (S1). Note that the predetermined value in this case may be a threshold value Vth serving as a criterion for determining whether or not to display a warning. If the battery voltage is not equal to or higher than the predetermined value, the reception process cannot be executed, and thus the satellite signal reception unit 31a ends the process.

  On the other hand, when the battery voltage is equal to or higher than the predetermined value, the satellite signal receiving unit 31a performs reception processing, and outputs the result (whether the reception processing is successful) to the voltage warning display unit 31c (S2). After the process of S2, the voltage warning display unit 31c determines whether or not the battery voltage is less than the threshold value Vth (S3). If the battery voltage is not less than the threshold value Vth, the warning display regarding the battery voltage is unnecessary, and the voltage warning display unit 31c ends the process. On the other hand, when the battery voltage is less than the threshold value Vth, the voltage warning display unit 31c determines whether or not the reception process of S2 is successful (S4), and branches the process according to the determination result. That is, when the reception process is successful (when the determination of S4 is “Y”), the voltage warning display unit 31c limits the warning display of the battery voltage drop (S5).

  On the other hand, when the reception process fails (when the determination in S4 is “N”), the voltage warning display unit 31c does not limit the warning display of the battery voltage drop. As a result, a warning display (here, 2-second hand movement) indicating that the battery voltage has dropped below the threshold value Vth is performed (S6).

  In both cases of S5 and S6, the voltage warning display unit 31c waits for the battery voltage to recover to the threshold value Vth or higher (S7), and ends the warning display restriction or warning display (S8). Here, the timing when the battery voltage recovers to the threshold value Vth or higher is used as the end timing of the warning restriction period.

  According to the above process, when the reception process is unsuccessful, the user can grasp whether or not the radio wristwatch 1 can instruct the reception process again based on whether or not the second-hand movement is performed. On the other hand, when the reception process is successful, even if the battery voltage decreases, it is not normally assumed that the user instructs the reception process again, so that no warning is displayed. Therefore, unnecessary warning display can be prevented from being performed to the user.

  When the user performs an operation for instructing reception processing on the operation unit 60 while the battery voltage is decreasing, the satellite signal receiving unit 31a does not ignore the instruction operation, but the battery voltage. It is also possible to execute the reception process after recovery from the state becomes possible. An example of the processing flow in this case will be described with reference to the flowchart of FIG.

  When there is an instruction for reception processing from the user, the satellite signal reception unit 31a first determines whether or not the battery voltage is equal to or higher than a predetermined value as in the case of the flow of FIG. 8 (S11). If the battery voltage is equal to or higher than the predetermined value, the reception process is immediately executed (S12).

  On the other hand, when the battery voltage is not equal to or higher than the predetermined value, a flag indicating that the reception instruction has been received (reception instruction reception flag) is set to ON (S13), and the battery voltage rises (S14). When it is detected that the battery voltage is equal to or higher than the predetermined value with the reception instruction reception flag turned on, the satellite signal reception unit 31a executes reception processing (S12). At this time, the satellite signal receiver 31a returns the reception instruction acceptance flag to OFF.

  Thereafter, the same processing as S3 and subsequent steps in FIG. 8 is executed. That is, the voltage warning display unit 31c first determines whether or not the battery voltage is lower than the threshold value Vth (S15), and ends the process if the battery voltage is equal to or higher than the threshold value Vth. On the other hand, when the battery voltage is less than the threshold value Vth, the voltage warning display unit 31c further determines whether or not the reception process of S12 is successful (S16). As a result of the determination, when the reception process is successful (when determination of S16 is “Y”), the voltage warning display unit 31c restricts the battery voltage drop warning display (S17), and when the reception process fails (S16). If the determination is “N”, a warning display indicating a decrease in battery voltage is performed (S18). Then, waiting for the battery voltage to recover to the threshold value Vth or more (S19), the warning display restriction or the warning display is terminated (S20).

  In this example, the user can instruct execution of reception processing even while a warning display indicating a decrease in battery voltage is being performed. The radio-controlled wristwatch 1 stores the reception instruction execution flag received by the reception instruction reception flag, and when a condition necessary for executing the reception process (condition that the battery voltage is equal to or greater than a predetermined value) is satisfied, the reception process is performed. To start. Note that such control by the reception instruction acceptance flag may be performed regardless of the warning display restriction. That is, in the example of the flow of FIG. 9, the warning display is not limited when the reception process fails, but the voltage warning display unit 31c may limit the warning display even when the reception process fails. In this case, since the temporary voltage drop is not presented to the user, the user is more likely to instruct the re-execution of the reception process. At this time, the above-described control of S11 to S14 is executed. Thus, the satellite signal receiving unit 31a can execute the reception process after the battery voltage is recovered.

  Further, in the example of the flow in FIG. 9, while the reception instruction reception flag is turned on and a standby state where the reception process can be performed is waited, a display indicating that may be performed. The display method in this case may be various methods that can be distinguished from the voltage warning display by the voltage warning display unit 31c, such as an irregular hand movement other than the 2-second hand movement.

  In the above description, the warning restriction period starts at the end of the reception process. However, since the battery voltage starts to decrease from the start of the reception process, the start of the reception process starts at the start of the warning restriction period. It is good also as timing. In this case, the voltage warning display unit 31c may determine the end timing of the warning restriction period by the various methods described above with reference to the start time of the reception process. Alternatively, the end timing of the warning restriction period may be determined based on the end of the reception process.

  Further, in the above description, when the reception process fails, the warning display similar to that at the time of a normal battery voltage drop is performed. However, the present invention is not limited to this, and the voltage warning display unit 31c displays another type of warning display. It is good as well. In other words, the voltage warning display unit 31c displays a normal warning when the battery voltage decreases when the reception process is not performed, and after the failure of the reception process, until the warning limit period elapses. When the battery voltage is lowered, a warning display indicating that a temporary voltage drop has occurred is performed separately from the normal warning display. In this way, the radio-controlled wristwatch 1 indicates to the user that the secondary battery 40 needs to be charged by a normal warning display, and displays a different warning display when reception processing fails. Although the battery voltage is temporarily lowered and the secondary battery 40 does not need to be charged, it can be shown to the user that the re-execution of the reception process cannot be instructed for a while.

  FIG. 10 and FIG. 11 are diagrams showing an example of a warning display indicating a temporary decrease in battery voltage due to such reception processing. FIG. 10 shows an example of the external appearance of the radio-controlled wristwatch 1 different from that in FIG. 1. In the example of this figure, a dedicated status indicator hand 54 is arranged on the dial 53 to indicate the battery voltage state. ing. FIG. 11 is an enlarged view of the state display needle 54. The state indicator hand 54 is controlled to rotate between the fan-shaped battery voltage display range 54a according to the fluctuation of the battery voltage, and the voltage warning display part 31c is controlled by the position of the state indicator hand 54. Present the drop to the user. Then, when the reception process is successful, the voltage warning display unit 31c does not change the position of the state display needle 54 until the warning limit period elapses, and does not display the temporary battery voltage fluctuation. To. On the other hand, when the battery voltage is lowered due to the failure of the reception process, the voltage warning display unit 31c moves the status display hand 54 so as to point to the reception disabling display position 54b arranged on the outer side of the battery voltage display range 54a. Rotate. As a result, the voltage warning display unit 31c is not in a state where the charge state of the secondary battery 40 is deteriorated, but is used in a state where the battery voltage is temporarily lowered and reception processing cannot be executed. Can be explicitly displayed to the user.

  Further, as described above, when a display to that effect is made while the reception instruction reception flag is on, the reception instruction reception flag must be turned on using such a state display needle 54. May be displayed. In this case, when the reception instruction acceptance flag is turned on, the radio wave wristwatch is rotated by rotating the state display hand 54 so as to indicate a predetermined position that is outside the battery voltage display range 54a and different from the reception disabled display position 54b. 1 displays that the reception instruction acceptance flag is turned on.

  The embodiment of the present invention is not limited to the above-described embodiment. For example, in the above description, the radio wristwatch 1 includes the secondary battery 40 and is operated by the power supplied by the secondary battery 40. However, the radio wristwatch 1 includes the primary battery instead of the secondary battery 40. It is good as well. Also in this case, the present invention can be applied as long as the battery voltage of the primary battery is temporarily reduced by the radio wave reception process. In the above description, the radio wristwatch 1 receives a radio wave from a GPS satellite and corrects the time. However, the radio wristwatch according to the embodiment of the present invention is not limited to a GPS satellite, but a standard radio wave transmitting station. For example, it may be a radio wave wristwatch that corrects the time by receiving radio waves from various time information sources.

  1 radio wave watch, 10 antenna, 20 receiving circuit, 21 high frequency circuit, 22 decoding circuit, 30 control circuit, 31 arithmetic unit, 31a satellite signal receiving unit, 31b time correction unit, 31c voltage warning display unit, 32 ROM, 33 RAM, 34 RTC, 35 Motor drive circuit, 40 Secondary battery, 41 Battery voltage detection part, 42 Switch, 43 Solar battery, 44 Temperature sensor, 50 Drive mechanism, 51 Time display part, 52 Pointer, 52a Hour hand, 52b Minute hand, 52c Second hand , 53 Dial, 54 Status indicator hand, 60 operation unit.

Claims (9)

Radio wave receiving means for receiving radio waves including time information;
Time display means for displaying time according to time information included in the received radio wave;
Voltage warning display means for displaying a warning when the voltage of the built-in battery drops,
Including
The voltage warning display means limits the display of the warning until the predetermined condition is satisfied after the reception processing by the radio wave reception means is completed, and the radio wave reception means A radio-controlled wristwatch that is determined according to a type of reception processing to be executed . Radio wave receiving means for receiving radio waves including time information;
Time display means for displaying time according to time information included in the received radio wave;
Voltage warning display means for displaying a warning when the voltage of the built-in battery drops,
Including
The voltage warning display means limits the display of the warning until the predetermined condition is satisfied after the reception processing by the radio wave reception means is completed, and the radio wave reception means The radio-controlled wristwatch is determined according to the time required for executing the reception process. Radio wave receiving means for receiving radio waves including time information;
Time display means for displaying time according to time information included in the received radio wave;
Voltage warning display means for displaying a warning when the voltage of the built-in battery drops,
Including
When the reception processing by the radio wave reception unit is successful, the voltage warning display unit restricts display of the warning until the predetermined condition is satisfied after the reception processing ends, and the reception processing fails The radio-controlled wristwatch does not restrict display of the warning. In the radio-controlled wristwatch according to claim 3 ,
When the reception process fails, the voltage warning display means performs a display of a type different from the display of the warning when the reception process is not performed as the display of the warning. Radio wave receiving means for receiving radio waves including time information;
Time display means for displaying time according to time information included in the received radio wave;
Voltage warning display means for displaying a warning when the voltage of the built-in battery drops,
Including
The voltage warning display means limits the display of the warning until a predetermined condition is satisfied after the reception processing by the radio wave receiving means is completed.
The radio wave receiving means waits for the voltage of the battery to recover to a predetermined threshold or higher when receiving an instruction to receive the radio wave from a user in a state where the voltage of the battery has dropped below a predetermined threshold. The radio-controlled wristwatch performs reception processing according to the instruction. Radio wave receiving means for receiving radio waves including time information;
Time display means for displaying time according to time information included in the received radio wave;
Voltage warning display means for displaying a warning when the voltage of the built-in battery drops,
A temperature sensor for detecting the temperature of the battery ;
Including
The voltage warning display means limits the display of the warning until the predetermined condition is satisfied after the reception processing by the radio wave receiving means is completed, and the temperature sensor detects a period during which the warning display is limited. A radio-controlled wristwatch characterized in that it is determined according to the measured temperature. Radio wave receiving means for receiving radio waves including time information;
Time display means for displaying time according to time information included in the received radio wave;
Voltage warning display means for displaying a warning when the voltage of the built-in battery drops,
Including
The voltage warning display means displays the warning when the voltage of the battery drops below a predetermined threshold, and after the reception processing by the radio wave receiving means ends, the voltage of the battery is equal to or higher than the predetermined threshold. The radio-controlled wristwatch restricts display of the warning until it recovers. Radio wave receiving means for receiving radio waves including time information;
Time display means for displaying time according to time information included in the received radio wave;
Voltage warning display means for displaying a warning when the voltage of the built-in battery drops,
Including
The voltage warning display means limits the display of the warning until the predetermined condition is satisfied after the reception process by the radio wave reception means, and the voltage of the battery at the end of the reception process by the radio wave reception means A radio wave wristwatch that determines the period for limiting the display of the warning according to the acquired voltage value. Radio wave receiving means for receiving radio waves including time information;
Time display means for displaying time according to time information included in the received radio wave;
Voltage warning display means for displaying a warning when the voltage of the built-in battery drops,
Including
The voltage warning display means displays the warning when the voltage of the battery drops below a predetermined threshold when the reception process by the radio wave reception means is not performed, and after the reception process ends, A radio-controlled wristwatch that limits the display of the warning by displaying the warning only when the voltage of the battery drops below a limit threshold smaller than the predetermined threshold.

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