JP6910895B2 - Radio clock - Google Patents

Description

The present invention relates to a radio clock.

Patent Document 1 discloses a radio-controlled clock that corrects an internal time based on a weekly time TOW (Time Of Week) included in a satellite signal transmitted from a GPS (Global Positioning System) satellite. The weekly time TOW indicates the seconds elapsed from midnight on the latest Sunday. In addition, the satellite signal contains information about the future leap second (LS), and that information is updated irregularly. The leap second adjusts the deviation between the time output by the atomic clock of the GPS satellite and UTC (Universal Time, Coordinated).

Japanese Unexamined Patent Publication No. 2009-250801

Here, the information regarding the future leap second (hereinafter, also referred to as LS information) is included only once out of 25 times (pages 1 to 25) of the subframe 4 of the satellite signal being transmitted. Specifically, the LS information is included only in the subframe 4 on page 18. Since one page contains signals for 30 seconds, LS information is transmitted only once every 12.5 minutes. In order to receive the LS information, it is preferable to execute the reception operation at the timing when the subframe 4 on page 18 is transmitted. However, if the internal time deviates from the actual current time, the reception operation may not be executed at the timing when the LS information is transmitted, and the reception of the LS information may fail.

The present invention has been made in view of such circumstances, and an object of the present invention is to improve the accuracy of receiving information on a future leap second.

The invention disclosed in the present application in order to solve the above problems has various aspects, and the outline of typical ones of these aspects is as follows.

(1) A radio-controlled clock having a receiving means for receiving a satellite signal transmitted from a satellite, and receiving information on a future leap second included in the satellite signal based on an internal time held by the radio-controlled clock. The receiving means has a control means for determining the timing at which the receiving means executes the leap second information receiving operation for the purpose, and the controlling means executes the leap second information receiving operation to perform the information regarding the future leap second. A radio-controlled clock that corrects the internal time when reception fails.

(2) In (1), the correction of the internal time by the control means causes the receiving means to receive information on the current time included in the satellite signal, and is performed based on the information on the current time. ..

(3) In (2), the reception of the information regarding the current time is performed by performing the leap second information receiving operation until the information regarding the current time included after the information regarding the leap second in the satellite signal is transmitted. Radio clock performed by continuing.

(4) In (1), there is an adjustment means for manually adjusting the internal time by the user, and an adjustment amount storage means for storing the adjustment amount of the internal time adjusted by the adjustment means. However, the adjustment of the internal time by the control means is performed based on the adjustment amount of the internal time of the radio-controlled clock.

(5) In any of (1) to (4), the internal time includes a first internal time displayed on the appearance of the radio-controlled timepiece and a second internal time not displayed on the appearance, and the control. A radio-controlled timepiece in which the correction of the internal time by means is performed only for the second internal time.

(6) A radio-controlled clock having a receiving means for receiving a satellite signal transmitted from a satellite, and receiving information on a future leap second included in the satellite signal based on an internal time held by the radio-controlled clock. The receiving means has a control means for determining the timing at which the receiving means executes the leap second information receiving operation for the purpose, and the controlling means executes the leap second information receiving operation to perform the information regarding the future leap second. A radio-controlled clock that prolongs the execution time of the next leap second information reception operation when the reception fails.

(7) A radio-controlled clock having a receiving means for receiving a satellite signal transmitted from a satellite, and receiving information on a future leap second included in the satellite signal based on an internal time held by the radio-controlled clock. The receiving means has a control means for determining the timing at which the receiving means executes the leap second information receiving operation for the purpose, and the controlling means executes the leap second information receiving operation to perform the information regarding the future leap second. A radio-controlled clock that changes the start timing of the execution of the next leap second information reception operation when the reception of the leap second information fails.

According to the aspects (1) to (7) of the present invention, the accuracy of receiving information regarding a future leap second can be improved.

It is a top view which shows the radio clock which concerns on 1st Embodiment. FIG. 5 is a cross-sectional view taken along the line AA of FIG. It is a figure which shows the circuit structure and system structure of the radio-controlled timepiece which concerns on 1st Embodiment. It is a figure which shows the structure of one subframe in the satellite signal transmitted by the GPS satellite. It is a figure explaining the time information reception operation in 1st Embodiment. It is a figure explaining the leap second information reception operation in 1st Embodiment. It is a figure explaining the operation when the reception of LS information in 1st Embodiment fails. It is a flowchart explaining the operation of the control part in 1st Embodiment. It is a flowchart explaining the correction of an internal time in 1st Embodiment. It is a figure explaining the operation when the reception of the LS information in the 2nd Embodiment fails. It is a flowchart explaining the operation of the control part in 2nd Embodiment. It is a figure explaining the operation when the reception of LS information in 3rd Embodiment fails. It is a flowchart explaining the operation of the control part in 3rd Embodiment.

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

FIG. 1 is a plan view showing a radio clock according to the first embodiment. FIG. 1 shows a body 1 which is the exterior (clock case) of the radio-controlled watch 100, a dial 2 arranged in the body 1, and an hour hand 3, a minute hand 4, and a second hand 5 which are pointers indicating the time. Further, a crown 6 and a button 7 for the user to perform various operations are arranged on the side surface of the body 1 on the 3 o'clock side. A band fixing portion 8 for fixing the band extends from the side surfaces of the body 1 on the 12 o'clock side and the 6 o'clock side.

The design of the radio-controlled clock 100 shown in FIG. 1 is an example. In addition to the ones shown here, for example, the body 1 may be square instead of round, and the presence / absence, number, and arrangement of the crown 6 and the button 7 are arbitrary. Further, in the first embodiment, the pointers are three, the hour hand 3, the minute hand 4, and the second hand 5, but the present invention is not limited to this, and the second hand 5 may be omitted, or the day of the week, the time zone, and the presence or absence of daylight saving time. You may add a guideline for displaying the reception status of radio waves, the remaining battery level, various displays, a date display, and the like.

In the first embodiment, the radio-controlled clock 100 has a function of receiving a satellite signal transmitted from a GPS (Global Positioning System) satellite and correcting the internal time based on the date and time information included in the satellite signal. The explanation will be given using a wristwatch. However, the present invention is not limited to a wristwatch, and may be another wearable terminal having a watch function. The internal time is time information (including time and date) held by the clock circuit inside the radio-controlled clock 100.

FIG. 2 is a cross-sectional view taken along the line AA of FIG. A windshield 9 is attached to the body 1 so as to cover the dial 2 of the radio-controlled watch 100, and a back cover 10 is attached to the body 1 on the opposite side of the windshield 9. The material of the windshield 9 is a transparent material such as glass, which is non-magnetic and non-conductive. The material of the body 1 and the back cover 10 is not particularly limited, but is metal in the first embodiment. In the first embodiment, the direction in which the windshield 9 of the radio-controlled watch 100 is arranged (upward in FIG. 2) is referred to as the windshield side, and the direction in which the back cover 10 is arranged (downward in FIG. 2) is referred to as the back cover side. Call.

A solar cell (photovoltaic panel) 11 is arranged on the back cover side of the dial 2, and power is generated by the light received from the windshield side. Therefore, the dial 2 is preferably made of a material that transmits light rays to some extent. In the first embodiment, the dial 2 is fixed to the base member 12 so as to sandwich the solar cell 11.

The base member 12 is made of a non-magnetic and non-conductive material such as synthetic resin, and supports various members such as a patch antenna 14 and a gear mechanism 25 for driving a pointer. The patch antenna 14 is provided with a feeding pin 14b so as to penetrate the thickness direction thereof, and the surface on the windshield side is a receiving surface 14a for receiving radio waves from the satellite.

The circuit board 24 is arranged on the back cover side of the base member 12, and the battery 26 is arranged on the back cover side thereof. In the first embodiment, the battery 26 is a rechargeable secondary battery, and a button-type lithium ion secondary battery is used. Then, the electric power generated by the solar cell 11 is stored. A motor 23, which is a drive source for the gear mechanism 25, is also attached to the circuit board 24. The shape of the battery 26 is not limited to the button type and is arbitrary. Further, as the secondary battery, a battery other than the lithium ion secondary battery, for example, a lithium ion capacitor or a nickel hydrogen storage battery may be used.

Here, as shown in FIG. 2, the receiving surface 14a of the patch antenna 14 is provided parallel to the light receiving surface of the solar cell 11, and both face the windshield side. Further, as shown in FIG. 1, the solar cell 11 has a substantially circular shape, and a part of the outer circumference thereof is cut into a rectangular shape. A patch antenna 14 is arranged in this portion. Therefore, both the receiving surface 14a of the patch antenna 14 and the light receiving surface of the solar cell 11 directly face the back surface of the dial 2. In the first embodiment, the amount of power generated by the solar cell 11 is the amount of light received by the radio-controlled clock 100. When strong light hits the dial 2, it is highly possible that the patch antenna 14 is facing the satellite, such as outdoors during the daytime or near a window, and the environment is suitable for receiving satellite signals.

FIG. 3 is a diagram showing a circuit configuration and a system configuration of the radio-controlled clock according to the first embodiment. The circuit elements shown in FIG. 3 are mainly arranged on the circuit board 24. The satellite signal received by the patch antenna 14 is converted into a baseband signal by the high-frequency circuit 46, and information about the time, specifically information indicating the time and date, is extracted by the decoder circuit 53 and received by the control unit 47. Passed. The receiving circuit (receiving means) 31 is configured by the high frequency circuit 46 and the decoder circuit 53. The control unit 47 is a microcomputer incorporating a driver for the motor 23, volatile and non-volatile memory, a clock circuit, various AD converters, and the like, and various controls are executed according to a program stored in the non-volatile memory. Here, the date and time correction information is stored in the volatile memory built in the control unit 47. The date and time correction information is extracted from the satellite signal, and includes information on the weekly time TOW, information on the current leap second, and information on the future leap second, which will be described later.

Further, the solar cell 11 is connected to the battery 26 via a switch 29, and in a state where the switch 29 conducts the solar cell 11 and the battery 26 according to an instruction from the control unit 47, the solar cell 11 generates electric power. The generated power is stored in the battery 26. Then, power is supplied from the battery 26 to the high frequency circuit 46, the decoder circuit 53, and the control unit 47.

Further, the solar cell 11 is also connected to the power generation amount detection unit 30 via the switch 29, and in a state where the switch 29 conducts the solar cell 11 and the power generation amount detection unit 30 according to an instruction from the control unit 47, the solar cell 11 is connected to the power generation amount detection unit 30. The current generated by the solar cell 11 flows through the power generation amount detection unit 30. The power generation amount detection unit 30 converts this current into a voltage, further converts this voltage into a digital value, and supplies it to the control unit 47.

The switch 56 is a switch for switching on / off of power supply to the receiving circuit 31, that is, the high frequency circuit 46 and the decoder circuit 53, and is controlled by the control unit 47. Since the high-frequency circuit 46 and the decoder circuit 53 that operate at high frequencies consume a large amount of power, the control unit 47 turns on the switch 56 only when receiving the satellite signal to turn on the receiving circuit 31, that is, the high-frequency circuit 46 and the decoder circuit 53. It is operated, and at other times, the switch 56 is turned off to reduce power consumption.

Here, a satellite signal (navigation data) transmitted by a GPS satellite used for adjusting the date and time of the radio-controlled clock 100 will be described. FIG. 4 is a diagram showing a configuration of one subframe in a satellite signal transmitted by a GPS satellite.

GPS satellites repeatedly transmit satellite signals with a total of 25 frames (pages) as one set in chronological order. Each frame contains a signal for 30 seconds, and the GPS satellite transmits a signal of all 25 frames in a cycle of 12.5 minutes. Further, each frame is composed of five subframe SFs. Since one frame is 30 seconds, one subframe SF corresponds to a signal for 6 seconds. The subframe SF of 1 contains information for 300 bits in total. Further, since 1 subframe SF is composed of 10 words and 1 subframe is 6 seconds, 1 word corresponds to a signal for 0.6 seconds.

The first word of each subframe SF is called a TLM (TeLeMetry word), and the TLM includes a code indicating the beginning of each subframe SF and information of the ground control station. The head portion of the TLM (that is, the head portion of the entire subframe SF) includes a preamble indicating the start position of the subframe SF.

The second word of each subframe SF is called HOW (HandOver Word), and the beginning of HOW is related to the GPS time starting from the beginning of the week (Sunday 0:00 am), that is, the current time. Information such as TOW (Time Of Week) within the week is included. The information following the HOW is different for each subframe SF, and the subframe SF1 includes the week number WN (Week Number) following the HOW. The week number WN is information indicating the number of the week to which the time represented by the weekly time TOW belongs, and is counted up once a week at 0:00 am on Sunday.

The subframes SF2 and SF3 include the orbital information of each GPS satellite called Ephemeris following the HOW, and the subframes SF4 and SF5 include the approximate orbits of all GPS satellites called the ephemeris following the HOW. Information is included, but a detailed description of it will be omitted.

Further, the explanation will be continued by returning to FIG. The radio clock 100 receives satellite signals from one or more GPS satellites. Then, the control unit 47 stores the weekly time TOW information extracted from the received satellite signal in the built-in volatile memory, and corrects the internal time based on the stored weekly time TOW information. , Drive the motor 23 based on the internal time. The rotational power generated by the motor 23 is transmitted to the pointers (hour hand 3, minute hand 4 and second hand 5) via the train wheel, and the time is displayed.

In addition, as information for correcting the internal time, there is information on the current leap second. The leap second adjusts the deviation between the time output by the atomic clock of the GPS satellite and UTC (Universal Time, Coordinated). The control unit 47 stores information on the current leap second extracted from the satellite signal in advance in the built-in volatile memory, and corrects the internal time based on the stored information on the current leap second.

Further, as information for correcting the internal time, there is information on future leap seconds (hereinafter, also referred to as LS information). The LS information is information including information on the scheduled leap second update date and time when the next leap second correction is performed, information on the correction amount in the next leap second correction, and the like. The control unit 47 stores the LS information extracted from the satellite signal in the built-in volatile memory, and corrects the internal time to the scheduled leap second update date and time based on the stored LS information. That is, the control unit 47 sets the internal time to the scheduled leap second update date and time based on the information on the future leap second acquired by the scheduled leap second update date and time in addition to the information on the weekly time TOW and the current leap second. Fix it. The leap second update date is, for example, the end of June or the end of December. Further, the LS information is updated irregularly, and is included in the satellite signal transmitted from the GPS satellite only for one month before the scheduled leap second update date, for example. Hereinafter, the period of one month before the scheduled leap second update date, that is, the period in which the LS information is included in the satellite signal and transmitted is referred to as the LS receivable period. The LS reception period is not limited to one month, and may be longer than one month (for example, two months) or shorter (for example, two weeks). Even after the leap second update scheduled date has passed, there may be a period in which the LS information scheduled to be updated this time is included until the LS information scheduled to be updated next time is included in the satellite signal, and that period is also LS. It will be included in the receivable period. If the LS information scheduled to be updated this time is acquired after the scheduled leap second update date scheduled to be updated this time has passed, the leap second this time will be reflected in the internal time without delay thereafter.

When the radio-controlled clock 100 is indoors or in an environment unsuitable for receiving satellite signals, there is a high possibility that the satellite signals cannot be received even if the reception operation is executed. In such an environment, executing the reception operation consumes unnecessary power. Therefore, in the first embodiment, a reception environment check is performed to determine whether or not the radio-controlled clock 100 is in an environment suitable for the reception environment, and it is determined that the radio-controlled clock 100 is in an environment suitable for the reception environment. When this is done, that is, when the environmental conditions for the reception operation are satisfied, the reception operation is executed.

The control unit 47 causes the reception circuit 31 to execute the satellite signal reception operation based on the detection result of the power generation amount detection unit 30. Specifically, when the detection value (power generation amount) detected by the power generation amount detection unit 30 is determined at a predetermined interval whether or not the detection value (power generation amount) is equal to or higher than a predetermined threshold value, and when a detection value equal to or higher than the predetermined threshold value is detected, The receiving circuit 31 is made to execute the receiving operation of the satellite signal. If the detected value detected by the power generation amount detecting unit 30 is equal to or higher than a predetermined threshold value, it can be said that there is a high possibility that the radio-controlled clock 100 is in an environment suitable for reception such as outdoors or near a window.

The time information receiving operation in the first embodiment will be described with reference to FIG. FIG. 5 is a diagram illustrating a time information receiving operation according to the first embodiment. Here, the time information receiving operation refers to a receiving operation for receiving the time TOW within the week. In FIG. 5, the timing at which the reception environment check by the control unit 47 is performed is indicated by an arrow. Further, the case where the detected value detected by the power generation amount detecting unit 30 is equal to or more than a predetermined threshold value is indicated by “OK”, and the case where the detected value is less than the predetermined threshold value is indicated by “NG”. The same applies to FIG. 6 described later.

FIG. 5 shows an example in which the environmental condition is satisfied when the “OK” determination is made twice in succession, and then the time information receiving operation is continuously executed for 6 seconds. When the "OK" determination is made twice in succession, the control unit 47 switches the switch 56 shown in FIG. 3 to the on state. Then, the receiving circuit 31 is activated to receive the satellite signal. That is, the time information receiving operation for receiving the weekly time TOW is executed.

As mentioned above, the weekly time TOW is included in all subframe SFs. Therefore, regardless of when the time information reception operation is started, the weekly time TOW can be acquired by continuing the reception operation for at least 6 seconds. In the example shown in FIG. 5, the weekly time TOW included in the subframe SF3 on page 2 is acquired. The subframe SF including the weekly time TOW to be acquired is arbitrary. That is, the time information receiving operation may be performed at the timing of acquiring the weekly time TOW included in any of the subframes SF1 to SF5. For example, in the example shown in FIG. 5, in the reception environment check performed at the timing of the subframe SF4 on page 1 and the timing 10 seconds after that (the timing of the beginning of the subframe SF1 on page 2), "OK". When the determination is made, it is preferable to perform the time information receiving operation at the timing when the weekly time TOW included in the subframe SF2 on page 2 can be acquired. Further, FIG. 5 shows an example in which the reception environment check is performed at intervals of 10 seconds, but the present invention is not limited to this, and the interval may be longer or shorter than the interval of 10 seconds. For example, when the detection interval of the reception environment check is set to an interval of 10 seconds, the drive timing of the minute hand 4 may also be one step every 10 seconds. By matching the detection interval of the reception environment check and the interval of driving the pointer in this way, the start timing of the control unit 47 (microcomputer) can be made the same. As a result, the frequency of activating the control unit 47 can be reduced, and the power consumption can be reduced.

The leap second information receiving operation in the first embodiment will be described with reference to FIG. FIG. 6 is a diagram illustrating a leap second information receiving operation in the first embodiment. Here, the leap second information reception operation refers to a reception operation for receiving LS information.

The LS information is included only once out of 25 transmissions of the satellite signal subframe SF4 (pages 1 to 25). Specifically, the LS information is included only in the subframe SF4 on page 18. Since each of the subframes SF1 to SF5 is transmitted over 6 seconds, the LS information is transmitted once every 12.5 minutes. The LS information is included after 4 to 5 seconds have elapsed from the TLM of the subframe SF4. In the radio clock 100, the deviation between the time output by the atomic clock of the GPS satellite and UTC (Universal Time, Coordinated) is adjusted by acquiring the LS information from the GPS satellite and combining it with the information of the week number WN. Can be done. That is, in order to correct the leap second correctly based on the LS information, it is necessary to acquire the week number WN included in the subframe SF1 on page 18. In FIG. 6, the environment is checked at 10-second intervals, and after the "OK" determination is made twice in a row, the leap second information reception operation is executed from 5 subframes of the subframe SF containing the LS information. Here is an example of starting. Specifically, an example will be described in which the leap second information receiving operation is started from the beginning of the subframe SF4 on page 17 and the leap second information receiving operation is continuously executed for 36 seconds until the end of the subframe SF5 on page 18. It is also possible to hold the week number WN inside the radio-controlled clock 100, in which case at least the subframe SF4 on page 18 may be received. In that case, the reception operation may be started immediately before the TLM of the subframe SF4 on page 18, and the execution time of the leap second information reception operation can be shortened, and the power consumption can be suppressed.

Here, in the first embodiment, the start timing of the execution of the satellite signal reception operation is determined based on the internal time of the radio-controlled clock 100. Specifically, first, the control unit 47 checks the reception environment, acquires the internal time when the radio-controlled clock 100 is determined to be in an environment suitable for the reception environment, and estimates from the acquired internal time. Get satellite signal pages and subframes. Then, the control unit 47 determines the start timing of the execution of the reception operation according to the page or subframe of the satellite signal estimated from the internal time.

Since the start timing of the execution of the reception operation is determined based on the internal time in this way, when the internal time held by the radio-controlled clock 100 deviates from the actual current time (hereinafter referred to as the reference time), the reception operation is performed. Even if you execute, you may not be able to receive the information contained in the target satellite signal. The reason why the internal time deviates from the reference time is that the user manually corrects the internal time, or the accuracy of the radio-controlled clock 100 (for example, monthly difference ± 15 seconds). The accuracy of the radio-controlled timepiece 100 is affected by, for example, the temperature characteristics of an oscillator such as a crystal oscillator included in the radio-controlled timepiece 100, and the internal time shift is large in an environment with a large temperature change, a high temperature environment, and a low temperature environment. Tends to be. Further, in a state where the voltage of the battery 26 that supplies power to the receiving circuit 31 drops, the accuracy of an oscillator such as a crystal oscillator deteriorates, and the internal time may shift.

Therefore, in the first embodiment, when the receiving circuit 31 executes the leap second information receiving operation and fails to receive the LS information, the control unit 47 adopts a configuration in which the internal time is corrected. Hereinafter, a specific description will be given with reference to FIG. 7.

FIG. 7 is a diagram illustrating an operation when reception of LS information in the first embodiment fails. In FIG. 7, (1) the satellite signal corresponding to the reference time, (2) the satellite signal estimated from the internal time of the radio-controlled clock 100, and the leap second information reception operation, and (3) the modified internal of the radio-controlled clock 100. The satellite signal estimated from the time and the leap second information reception operation are shown.

In (2) of FIG. 7, among the satellite signals estimated from the internal time of the radio-controlled clock 100, the leap second information reception operation is started from the head portion of the subframe SF4 on page 17, and the subframe on page 18 is executed. An example in which the reception operation is continued until the end of SF4 is shown. In the example shown in (2) of FIG. 7, the internal time deviates from the reference time, and the amount of the deviation is defined as A. Since the internal time deviates from the reference time, the leap second information reception operation is performed until the middle of the subframe 4 on page 18 (a minute before the deviation amount A from the end of the subframe 4) among the satellite signals corresponding to the reference time. Will only be executed. Therefore, the leap second information reception operation may end before the timing at which the satellite signal including the LS information is transmitted, and the reception of the LS information may fail. If the reception of the LS information fails, the leap second information reception operation is further executed to try to receive the LS information, but the leap second information is received again with the internal time of the radio-controlled clock 100 deviated from the reference time. Even if the operation is executed, reception fails in the same way.

Therefore, in the first embodiment, when the reception of the LS information fails, the time information receiving operation described with reference to FIG. 5 is executed before the next leap second information receiving operation is executed. By executing the time information receiving operation, the weekly time TOW is received, and the information of the weekly time TOW received by the control unit 47 is stored in the volatile memory. Then, the control unit 47 corrects the internal time based on the stored information of the weekly time TOW. As a result, the internal time of the radio-controlled clock 100 is corrected so as to match the reference time. Then, after correcting the internal time, the leap second information receiving operation is started again from the head portion of the subframe SF4 on page 17 among the satellite signals estimated from the internal time of the radio-controlled clock 100, and the execution of the leap second information reception operation is started again on page 18. It continues until the end of the subframe SF4 ((3) in FIG. 7). As a result, among the satellite signals corresponding to the reference time, the execution of the leap second information reception operation is started from the head portion of the subframe SF4 on page 17, and continues until the end of the subframe SF4 on page 18. Therefore, it is possible to succeed in receiving the LS information included in the subframe SF4 on page 18. The time information receiving operation may be executed immediately after the failure to receive the LS information or during the day of the failure, or may be performed the day after the day when the reception of the LS information fails. For example, when the reception of the LS information fails because the environment is not suitable for receiving the satellite signal, it is preferable to execute the time information receiving operation on or after the next day. On the other hand, if the reception of the LS information fails even though the environment is suitable for receiving the satellite signal, it is preferable to execute the time information reception operation immediately after the failure to receive the LS information or during the day. .. Whether or not the environment is suitable for receiving satellite signals may be determined by performing a reception environment check immediately after the failure to receive the LS information. For example, if the reception environment is checked immediately after the LS information reception failure and the judgment is "OK", the time information reception operation may be executed immediately after that or during the day, and if the judgment is "NG", the time information reception operation may be executed the next day or later. good.

Further, the operation of the control unit according to the first embodiment will be described with reference to FIG. FIG. 8 is a flowchart illustrating the operation of the control unit according to the first embodiment. First, a reception environment check for receiving LS information is performed based on the internal time (step S1). For example, as shown in FIG. 6, this reception environment check may be performed when the satellite signal estimated from the internal time is in the vicinity of the subframe SF1 on page 17. When the control unit 47 determines that the reception environment is not available (NO in step S2), the reception environment check is repeated. When it is determined that the control unit 47 is in the receivable environment (YES in step S2), it is determined whether or not the execution condition of the leap second information receiving operation is satisfied (step S3). When it is determined that the execution condition of the leap second information receiving operation is satisfied, the control unit 47 causes the receiving circuit 31 to execute the leap second information receiving operation (step S4). The leap second information receiving operation may be executed after a predetermined period has elapsed from the determination that the execution condition of the leap second information receiving operation is satisfied. This is because if the leap second information receiving operation is executed immediately after it is determined that the execution condition is satisfied, the execution time may become long and the power consumption may increase.

Here, whether or not the execution condition of the leap second information reception operation is satisfied is, for example, whether or not the LS reception is possible, whether or not the LS information has already been acquired, and whether or not the previous leap second information reception operation is executed. It is advisable to make a judgment based on whether or not a predetermined number of days have passed. If it is outside the LS receivable period, that is, other than June and December, it is preferable that the execution condition of the leap second information reception operation is not satisfied. This is because it is not necessary to execute the leap second information reception operation because the satellite signal does not include the LS information in the months other than June and December. Even if it is not June or December, the leap second information reception operation is performed before the period when the LS information scheduled to be updated next time is included in the satellite signal and during the period when the LS information scheduled to be updated this time is included. It is good to satisfy the execution condition of. Information about the month may be acquired based on the value of the week number WN counted every week. Alternatively, it may be stored in the memory built in the radio-controlled clock 100 and acquired from the calendar information generated based on the week number WN. Further, when the LS information has already been received, it is preferable that the execution condition of the leap second information receiving operation is not satisfied. This is because once the LS information is received, it is not necessary to receive it until the next scheduled leap second update date. Further, since the power consumption increases if the leap second information receiving operation is executed every day, it is preferable to execute the leap second information receiving operation after a predetermined number of days. Therefore, for example, when three days or more have passed since the last leap second information receiving operation was executed, it is preferable to satisfy the execution condition of the leap second information receiving operation.

Further, whether or not the execution condition of the leap second information reception operation is satisfied may be determined based on the internal time when it is determined that the reception environment is present. For example, if the internal time when it is determined to be in the reception environment is the time when the satellite signal estimated from the internal time corresponds to page 16 or 17, it is determined that the execution condition of the leap second information reception operation is satisfied. If the time corresponds to a page other than that, it is preferable to determine that the execution condition of the leap second information receiving operation is not satisfied. Note that this is an example, and if the satellite signal estimated from the internal time when it is determined to be in the reception environment is near the subframe SF including the LS information, the execution condition of the leap second information reception operation is satisfied. You just have to judge.

When it is determined that the execution condition of the leap second information receiving operation is not satisfied (NO in step S3), it is determined whether or not the execution condition of the time information receiving operation is satisfied (step S5). Here, whether or not the execution condition of the time information receiving operation is satisfied may be determined based on, for example, whether or not a predetermined number of days have passed since the last time information receiving operation was executed. This is because if the time information receiving operation is executed every day, the power consumption increases, and therefore it is preferable to execute the time information receiving operation after a predetermined number of days. For example, when 6 days or more have passed since the last time information receiving operation was executed, it is preferable that the execution condition of the time information receiving operation is satisfied. When the control unit 47 determines that the execution condition of the time information reception operation is satisfied (YES in step S5), the control unit 47 causes the reception circuit 31 to execute the time information reception operation (step S6).

In step S4, when the control unit 47 causes the receiving circuit 31 to execute the leap second information receiving operation, it further determines whether or not the reception of the LS information is successful (step S7). When the control unit 47 determines that the reception of the LS information has failed (NO in step S7), the control unit 47 executes an operation for correcting the internal time described with reference to FIG. 9 (step S8).

The modification of the internal time in the first embodiment will be described with reference to FIG. FIG. 9 is a flowchart illustrating the correction of the internal time in the first embodiment. First, a reception environment check for receiving the weekly time TOW is performed based on the internal time (step S9). When the control unit 47 determines that the reception environment is not available (NO in step S10), the reception environment check is repeated. When the control unit 47 determines that the environment is receivable (YES in step S10), the reception circuit 31 is made to execute the time information reception operation (step S11). Here, it was decided to execute the time information receiving operation without determining whether or not the execution condition of the time information receiving operation described in step S5 of FIG. 8 is satisfied. For example, if the execution condition is that the number of days elapsed since the previous time information reception operation was executed is 6 days or more, the next leap second information reception operation cannot be executed until the execution condition is satisfied, and reception is possible. This is because the accuracy of receiving the LS information for which the period is limited is reduced.

The control unit 47 stores the information of the weekly time TOW received by executing the time information receiving operation in the volatile memory. Then, the control unit 47 corrects the internal time based on the stored information of the weekly time TOW (step S12). As a result, the internal time of the radio-controlled clock 100 is corrected so as to match the reference time. After correcting the internal time in this way, the control unit 47 further performs the operation described with reference to FIG. Since the internal time has been corrected, when the leap second information reception operation is executed again (step S4), the possibility of failure in receiving LS information due to the internal time deviating from the reference time is reduced. be able to. That is, in the first embodiment, the accuracy of receiving the LS information can be improved.

The correction of the internal time after the failure to receive the LS information is not limited to the operation described with reference to FIG. 9, and may be performed by another method. Hereinafter, each modification of the first embodiment in which the internal time is corrected by another method will be described.

Even if the reception of the LS information fails due to the leap second information reception operation, the reception of the weekly time TOW may be successful. Therefore, in the first modification, the internal time is not corrected based on the weekly time TOW received by executing the time information receiving operation, but the weekly time received by executing the leap second information receiving operation. TOW is used to correct the internal time. Specifically, the control unit 47 stores the weekly time TOW received by the leap second information receiving operation in the built-in volatile memory before the next leap second information receiving operation, and stores the stored weekly time. Correct the internal time based on the TOW information. In the first modification, it is preferable to execute the next leap second information receiving operation without performing the operation described with reference to FIG. As a result, it is not necessary to separately execute the time information receiving operation, and power consumption can be suppressed. Further, since it is not necessary to separately execute the time information receiving operation, it is not necessary to perform a reception environment check for determining whether or not to execute the time information receiving operation, and power consumption can be suppressed.

In the second modification, the leap second information receiving operation that failed to receive the LS information is continued until the weekly time TOW included after the end timing of the leap second information receiving operation is received, so that the weekly time TOW is received. Is received and the internal time is corrected based on the weekly time TOW. In the second modification, the next leap second information reception operation may be executed without performing the operation described with reference to FIG. 9, as in the first modification. The second modification is particularly effective when the week number WN is held inside the radio-controlled clock 100 and the execution time of the leap second information receiving operation is shortened. This is because if the execution time of the leap second information receiving operation is short, the possibility of receiving the weekly time TOW is low. In the second modification in which the leap second information receiving operation is continued until the weekly time TOW is received, it is not necessary to separately execute the time information receiving operation, and the power consumption can be suppressed. Further, since it is not necessary to separately execute the time information receiving operation, it is not necessary to perform a reception environment check for determining whether or not to execute the time information receiving operation, and power consumption can be suppressed.

In the third modification, the internal time after the failure to receive the LS information is corrected based on the time adjustment amount previously performed manually by the user. The internal time held by the radio-controlled timepiece 100 can be adjusted by the user operating an input means such as a crown 6 or a button 7. Therefore, if the user manually adjusts the internal time, the internal time may deviate from the reference time and the information included in the target satellite signal may not be received. Therefore, in the third modification, the adjustment amount storage unit 47a included in the control unit 47 stores the adjustment amount of the internal time by the user. Then, the control unit 47 corrects the internal time based on the adjustment amount of the internal time stored in the adjustment amount storage unit 47a. Specifically, for example, if the user adjusts the internal time for 5 seconds by operating the input means before executing the leap second information receiving operation, the control unit 47 returns to the time before the adjustment. It is advisable to correct the internal time by 5 seconds. However, the adjustment amount by the user and the correction amount by the control unit 47 do not necessarily have to match. In the third modification, the user manually adjusts the internal time for leap seconds or adjusts for a specific time such as +15 minutes because the LS information could not be received before the previous scheduled leap second update date. It is effective when you are doing it. When the user manually adjusts the internal time in the past, the adjustment amount storage unit 47a stores the adjustment amount and sets a flag regarding the adjustment, and prioritizes the operation described in other embodiments. Then, the operation of the third modification may be executed.

In the fourth modification, the internal time after the failure to receive the LS information is corrected based on the leap second adjustment amount previously performed manually by the user. The leap second held by the radio-controlled timepiece 100 can be adjusted by the user operating an input means such as a crown 6 or a button 7. Therefore, if the user manually adjusts the leap second, the internal time may deviate from the reference time and the information included in the target satellite signal may not be received. Therefore, in the fourth modification, the adjustment amount storage unit 47a included in the control unit 47 stores the adjustment amount of the leap second by the user. Then, the control unit 47 corrects the internal time based on the leap second adjustment amount stored in the adjustment amount storage unit 47a. When the user manually adjusts the leap second in the past, the adjustment amount storage unit 47a stores the adjustment amount and sets a flag regarding the adjustment, and prioritizes the operation described in other embodiments. Then, the operation of the fourth modification may be executed.

In the fifth modification, the internal time after the failure to receive the LS information is corrected based on the information regarding the leap second received last. That is, the leap second received in the past is reflected in the internal time. This modification is effective when the user manually adjusts the leap second, so that the internal time deviates from the reference time and the reception of the LS information fails.

When the internal time is corrected in order to increase the probability of successful reception after the reception of the LS information fails as described in the first embodiment and each modification, the pointer indicating the internal time moves, and the guideline indicates the internal time. The movement may make the user feel uncomfortable. Therefore, for example, the internal time may be configured to include a first internal time displayed on the appearance of the radio-controlled clock 100 and a second internal time not displayed on the appearance. Here, the first internal time is a time indicated by a pointer and visible to the user, and the second internal time is preferably a time held only inside the radio-controlled clock 100 and not visible to the user. Then, it is preferable that the correction of the internal time after the failure to receive the LS information is performed only for the second internal time, not for the first internal time. With such a configuration, it is possible to improve the accuracy of receiving the LS information and suppress the user from feeling uncomfortable with the behavior of the pointer.

Next, the second embodiment will be described with reference to FIGS. 10 and 11. FIG. 10 is a diagram illustrating an operation when reception of LS information in the second embodiment fails. In FIG. 10, (1) a satellite signal corresponding to a reference time, (2) a satellite signal estimated from the internal time of the radio clock 100, and a leap second information receiving operation, and (3) estimated from the internal time of the radio clock 100. The satellite signal to be performed and the leap second information reception operation after the execution time is changed are shown. Regarding the configuration of the radio-controlled clock 100 and the operation of the control unit 47 described with reference to FIGS. 1 to 6, the same reference numerals are used for similar ones, and the description thereof will be omitted as appropriate.

In the example shown in FIG. 10, the internal time deviates from the reference time (deviation amount A). Therefore, the leap second information reception operation is executed only up to the middle of the subframe 4 on page 18 (a minute before the deviation amount A from the end of the subframe 4) among the satellite signals corresponding to the reference time. Therefore, as in the first embodiment described with reference to FIG. 7, there is a possibility that the reception of the LS information included in the subframe SF4 on page 18 may fail.

Therefore, in the second embodiment, when the receiving circuit 31 executes the leap second information receiving operation and fails to receive the LS information, a configuration is adopted in which the execution time of the next leap second information receiving operation is extended. Specifically, as shown in (3) of FIG. 10, the execution time of the next leap second information reception operation is about 3 seconds (subframe 2 minutes) longer than the execution time of the previous leap second information reception operation. I made it longer (for one). As a result, the leap second information reception operation is executed from the beginning of the subframe 4 on page 17 to the middle of the subframe SF5 on page 18 among the satellite signals estimated from the internal time (FIG. 10). (2)). That is, the leap second information reception operation is executed from the middle of the subframe SF3 on page 17 to the end of the subframe SF4 on page 18 among the satellite signals corresponding to the reference time ((3) in FIG. 10). )). Therefore, the LS information included in the subframe SF4 on page 18 can be received. If the execution time of the leap second information receiving operation is extended and the reception of the LS information still fails, the execution time of the next leap second information receiving operation may be further extended. As a result, even when the internal time shift is large, it is possible to improve the possibility of succeeding in receiving the LS information by repeatedly extending the execution time. Although FIG. 10 shows an example of extending the execution time by 3 seconds, the extension time is not limited to this, and may be, for example, 30 seconds. Since the satellite signal has a total cycle of 25 frames (pages) of 12.5 minutes as described above, the execution time including the extension time should be 12.5 minutes at the maximum. If the LS information cannot be received even if the execution time is the length of one set of satellite signals, it is considered that the reception failed due to a cause other than the internal time shift, and the reception is received even if the execution time is longer than 12.5 minutes. This is because there is no chance of success. For example, when the reception environment is the cause of the reception failure, it is advisable to tighten the conditions for checking the reception environment (for example, increase the threshold value of the detection value (power generation amount) for determining "OK").

FIG. 11 is a flowchart illustrating the operation of the control unit according to the second embodiment. First, a reception environment check for receiving LS information is performed based on the internal time (step S1). For example, as shown in FIG. 6, this reception environment check may be performed when the satellite signal estimated from the internal time is in the vicinity of the subframe SF1 on page 17. Then, when it is determined that the control unit 47 is in the receivable environment (YES in step S2), it is determined whether or not the execution condition of the leap second information receiving operation is satisfied (step S3). Then, in the second embodiment, when it is determined that the execution condition of the leap second information reception operation is satisfied (YES in step S3), it is determined whether or not there is a reception failure flag (step S11). The reception failure flag is set when the reception of LS information fails in the previous leap second information reception operation. If there is no reception failure flag, that is, if the leap second information reception operation has not yet been executed (NO in step S11), the control unit 47 causes the reception circuit 31 to execute the leap second information reception operation (step S4).

On the other hand, when there is a reception failure flag, that is, when reception of LS information fails in the previous leap second information reception operation (YES in step S11), as described with reference to (3) of FIG. The execution time of the second information receiving operation is extended (step S12), and the control unit 47 causes the receiving circuit 31 to execute the leap second information receiving operation (step S4).

Further, after executing the leap second information receiving operation, the control unit 47 determines whether or not the reception of the LS information is successful (step S7). When the control unit 47 determines that the reception of the LS information has failed (NO in step S7), the control unit 47 sets the reception failure flag (step S13), returns to step S1, and checks the reception environment.

Next, the third embodiment will be described with reference to FIGS. 12 and 13. FIG. 12 is a diagram illustrating an operation when reception of LS information in the third embodiment fails. In FIG. 12, (1) a satellite signal corresponding to a reference time, (2) a satellite signal estimated from the internal time of the radio-controlled clock 100, and a leap second information receiving operation, and (3) estimated from the internal time of the radio-controlled clock 100. The satellite signal to be received and the leap second information reception operation after the start timing is changed are shown. Regarding the configuration of the radio-controlled clock 100 and the operation of the control unit 47 described with reference to FIGS. 1 to 6, the same reference numerals are used for similar ones, and the description thereof will be omitted as appropriate.

In the example shown in FIG. 12, the internal time deviates from the reference time (deviation amount A). Therefore, the leap second information reception operation is executed only up to the middle of the subframe 4 on page 18 (a minute before the deviation amount A from the end of the subframe 4) among the satellite signals corresponding to the reference time. Therefore, as in the first embodiment described with reference to FIG. 7, there is a possibility that the reception of the LS information included in the subframe SF4 on page 18 may fail.

Therefore, in the third embodiment, when the receiving circuit 31 executes the leap second information receiving operation and fails to receive the LS information, a configuration is adopted in which the start timing of the execution of the next leap second information receiving operation is delayed. In the third embodiment, unlike the second embodiment, the execution time of the leap second information receiving operation is the same before and after the failure to receive the LS information. Specifically, as shown in (3) of FIG. 12, the start timing of the execution of the next leap second information receiving operation is about 3 seconds (sub) from the start timing of the execution of the previous leap second information receiving operation. It was delayed by half the frame). As a result, the leap second information reception operation is executed from the middle of the subframe 4 on page 17 to the middle of the subframe SF5 on page 18 among the satellite signals estimated from the internal time ((FIG. 12). 2)). That is, the leap second information reception operation is executed from the beginning of the subframe SF4 on page 17 to the end of the subframe SF4 on page 18 among the satellite signals corresponding to the reference time ((FIG. 12). 3)). Therefore, the LS information included in the subframe SF4 on page 18 can be received. If the start timing of the execution of the leap second information receiving operation is delayed and the reception of the LS information still fails, the start timing of the execution of the next leap second information receiving operation may be further delayed. As a result, even when the internal time shift is large, the possibility of succeeding in receiving the LS information can be improved by repeatedly delaying the start timing of the execution of the leap second information receiving operation.

FIG. 13 is a flowchart illustrating the operation of the control unit according to the third embodiment. First, a reception environment check for receiving LS information is performed based on the internal time (step S1). For example, as shown in FIG. 6, this reception environment check may be performed when the satellite signal estimated from the internal time is in the vicinity of the subframe SF1 on page 17. Then, when it is determined that the control unit 47 is in the receivable environment (YES in step S2), it is determined whether or not the execution condition of the leap second information receiving operation is satisfied (step S3). Then, in the second embodiment, when it is determined that the execution condition of the leap second information reception operation is satisfied (YES in step S3), it is determined whether or not there is a reception failure flag (step S11). The reception failure flag is set when the reception of LS information fails in the previous leap second information reception operation. If there is no reception failure flag, that is, if the leap second information reception operation has not yet been executed (NO in step S11), the control unit 47 causes the reception circuit 31 to execute the leap second information reception operation (step S4).

On the other hand, when there is a reception failure flag, that is, when reception of LS information fails in the previous leap second information reception operation (YES in step S11), as described with reference to (3) of FIG. After delaying the start timing of the execution of the second information reception operation from the previous leap second reception operation (step S22), the control unit 47 causes the reception circuit 31 to execute the leap second information reception operation (step S4).

Further, after executing the leap second information receiving operation, the control unit 47 determines whether or not the reception of the LS information is successful (step S7). When the control unit 47 determines that the reception of the LS information has failed (NO in step S7), the control unit 47 sets the reception failure flag (step S13), returns to step S1, and checks the reception environment.

Although FIG. 12 shows an example in which a deviation occurs due to the internal time being delayed from the reference time, the internal time may be earlier than the reference time. In order to deal with such a case, the execution timing of the leap second information reception operation to be executed after the failure to receive the LS information may be accelerated. For example, as described above, when the radio-controlled clock 100 holds the week number WN internally and shortens the execution time of the leap second information receiving operation so as to receive at least the subframe SF4 on page 18 (for example, 6 seconds). ), A configuration that accelerates the execution timing of the leap second information operation is effective.

After the reception of the LS information fails, it is preferable to determine whether to delay or advance the execution timing of the leap second information reception operation based on the satellite signal at the time of the reception failure. For example, if the reception of LS information fails and the page of the satellite signal received by the leap second information reception operation immediately before the time is over is page 17 or 18, the leap second information reception operation to be executed after the reception failure It is good to delay the execution timing. On the other hand, when the page of the satellite signal received by the leap second information receiving operation immediately before the time is over is page 19 or 20, it is preferable to accelerate the execution timing of the leap second information receiving operation to be executed after the reception failure.

The first embodiment and its modifications, the second embodiment, and the third embodiment have been described above, but it is advisable to determine which mode of operation is to be executed, for example, as follows. Abnormal if a predetermined period (for example, one month) has passed since the last time TOW was received during the week, or if the user manually flags that the internal time has been adjusted before. When the flag related to being in the environment is set, and if any of the above is applicable, the operation described in the first embodiment may be executed. Further, in the case where none of these cases apply and the predetermined period (for example, one year) has not passed since the last information on the leap second was received, the fifth modification of the first embodiment The operation described in the example may be executed, and if it has passed, the operation described in the second embodiment or the third embodiment may be executed. At this time, if the page of the satellite signal received by the leap second information reception operation immediately before the time over is not any of pages 17 to 19, the operation described in the third embodiment is executed for a maximum of 12.5 minutes. It is good to execute as.

Further, for example, it may be determined by the number of remaining days until the leap second update scheduled date. For example, at the beginning of the month in June or December, the operation described in the first embodiment is preferentially executed, and when the number of remaining days is 10 days or less, the operation described in the second embodiment or the third embodiment is described. It is advisable to preferentially execute the performed operation.

In each of the above embodiments and modifications, an example in which light detection is performed using the solar cell 11 has been described, but the present invention is not limited to this, and for example, an ultraviolet sensor is used to determine the presence or absence of sunlight. This may be configured to determine the reception environment. Alternatively, the reception environment may be determined by detecting the amount of received light by performing image analysis using an image sensor such as a camera.

Further, in each of the above-described embodiments and modifications, an example in which determination of whether or not the environmental condition of the reception operation is satisfied is performed based on the power generation amount (light reception amount) detected by the power generation amount detection unit 30 has been described. The information is not limited to the above, and any information that can determine whether the radio-controlled clock 100 is outdoors or indoors may be used based on other information. For example, when the acceleration sensor is used as a detection means and the acceleration sensor outputs information that determines that the user of the radio-controlled clock 100 is running, the radio-controlled clock 100 is outdoors and the radio-controlled clock 100 outputs a satellite signal. It can be determined that the environment is suitable for receiving. That is, it can be determined that the environmental condition of the reception operation is satisfied. Further, for example, when a sound sensor is used as a detection means, the sound sensor acquires the environmental sound around the radio-controlled clock 100, and information for determining that the radio-controlled clock 100 is outdoors is detected, the radio-controlled clock 100 is a satellite. It can be determined that the environment is suitable for receiving the signal.

The reception environment check may always be performed at intervals of 10 seconds, or the time when it is performed and the time when it is not performed may be separated depending on the time zone. For example, it is advisable to set so that the reception environment check is not performed in the midnight time zone. Further, the reception environment check may be performed when a request is made from the user by an input means such as a crown 6 or a button 7.

The radio-controlled clock 100 may further include a temperature measuring device that measures the time based on the oscillation frequency of the oscillator and measures the operating environment temperature of the radio-controlled clock 100. The oscillator has a temperature characteristic, and in an environment of an abnormal temperature (for example, −10 ° C. or lower or 60 ° C. or higher), there is a possibility that a rate shift may occur. Therefore, in an environment of abnormal temperature, the accuracy of the internal time is lowered, and the target satellite signal may not be received even if the reception operation is performed. Further, in an environment of abnormal temperature, the reception operation itself may not be executed normally. Therefore, when the temperature measuring instrument detects an abnormal temperature, it is preferable that the reception environment check is not executed. As a result, the power consumption required for the reception environment check can be suppressed. It is preferable that the reception environment check can be executed when the temperature is no longer in an abnormal temperature environment, for example, when the temperature measuring device detects 5 ° C to 40 ° C. In an abnormal environment, the internal time tends to be delayed from the reference time. Therefore, when the leap second information reception operation executed after the abnormal environment disappears and the reception of the LS information fails, it is preferable to preferentially perform the operation for extending the execution time described in the third embodiment.

The signal received by the radio clock 100 is not limited to that transmitted from GPS satellites, and is, for example, a signal transmitted by QZSS (Quasi-Zenith Satellite System, Quasi-Zenith Satellite System: Michibiki) or GLONASS (Global Navigation Satellite System). However, the configuration may be such that reception corresponding to these a plurality of satellites is possible. Further, by selecting a satellite having a large number of satellites arranged in orbit and receiving a signal transmitted from the selected satellite, it is expected that the success rate of reception will be improved. Since the satellite signal from the GPS satellite is the earliest for the update timing of the LS information, it is preferable to preferentially select the GPS satellite when the configuration corresponds to a plurality of satellites.

Further, for example, a stop display indicating that the reception environment check is stopped, a start display indicating that the reception environment check has been started, and a reception indicating that the reception environment check has been successful and the reception circuit 31 has been started are received. The dial 2 may be provided with a middle display or the like so that the user can confirm it by pointing to them with a pointer. This makes it possible to urge the user to move the radio-controlled clock 100 to an environment suitable for the reception environment. Similarly, the dial 2 is provided with a display indicating that the LS information has been received and a display indicating that the LS information has not been received, and by pointing to them with a guideline, it is possible to confirm whether or not the user has received the LS information. It is good to have a configuration. In addition, a warning display indicating that the LS information has not been received and the number of days remaining until the leap second update scheduled date is small is provided on the dial 2, and the radio-controlled clock 100 is moved to an environment in which the LS information can be received. It is preferable to have a configuration that prompts the user. Further, as the number of remaining days decreases, such as 20 days, 10 days, and 5 days, the warning level may be switched so that the user can easily notice the warning display. For example, as the number of remaining days decreases, the movement of the hand movement may be increased, the rotation speed of the hand movement may be increased, or the pointer used for the warning display may be switched to a prominent one. Further, when the LS information has not been received, the reception operation may be forcibly started at the request of the user by the input means such as the crown 6 or the button 7.

Although the embodiment according to the present invention has been described above, the specific configuration shown in this embodiment is shown as an example, and it is not intended to limit the technical scope of the present invention to this. Those skilled in the art may appropriately modify these disclosed embodiments, and it should be understood that the technical scope of the invention disclosed herein also includes such modifications.

1 body, 2 dial, 3 hour hand, 4 minute hand, 5 second hand, 6 crown, 7 button, 8 band fixing part, 9 windshield, 10 back cover, 11 solar cell, 12 base member, 14 patch antenna, 14a receiving surface, 14b power supply pin, 23 motor, 24 circuit board, 25 gear mechanism, 26 battery, 29 switch, 30 power generation amount detection unit, 31 reception circuit, 46 high frequency circuit, 47 control unit, 47a adjustment amount storage unit, 53 decoder circuit, 56 Switch, 100 radio clock.

Claims (7)

A radio-controlled clock having a receiving means for receiving a satellite signal transmitted from a satellite.
It has a control means for determining the timing at which the receiving means executes a leap second information receiving operation for receiving information on a future leap second included in the satellite signal based on the internal time held by the radio-controlled clock. ,
The control means is a radio-controlled clock that corrects the internal time when the receiving means executes the leap second information receiving operation and fails to receive information on the future leap second. The radio-controlled clock according to claim 1, wherein the control means corrects the internal time by causing the receiving means to receive information on the current time included in the satellite signal and based on the information on the current time. 2. The reception of the information regarding the current time is performed by continuing the leap second information receiving operation until the information regarding the current time included after the information regarding the leap second among the satellite signals is transmitted. Radio clock described in. An input means for the user to manually adjust the internal time, and
An adjustment amount storage means for storing the adjustment amount of the internal time adjusted by the input means, and an adjustment amount storage means.
Have,
The radio-controlled timepiece according to claim 1, wherein the adjustment of the internal time by the control means is performed based on the adjustment amount of the internal time stored in the adjustment amount storage means. The internal time includes a first internal time displayed on the appearance of the radio-controlled timepiece and a second internal time not displayed on the appearance.
The radio-controlled timepiece according to any one of claims 1 to 4, wherein the correction of the internal time by the control means is performed only for the second internal time. A radio-controlled clock having a receiving means for receiving a satellite signal transmitted from a satellite.
It has a control means for determining the timing at which the receiving means executes a leap second information receiving operation for receiving information on a future leap second included in the satellite signal based on the internal time held by the radio-controlled clock. ,
The control means is a radio-controlled clock that prolongs the execution time of the next leap second information receiving operation when the receiving means executes the leap second information receiving operation and fails to receive information on the future leap second. A radio-controlled clock having a receiving means for receiving a satellite signal transmitted from a satellite.
It has a control means for determining the timing at which the receiving means executes a leap second information receiving operation for receiving information on a future leap second included in the satellite signal based on the internal time held by the radio-controlled clock. ,
When the receiving means executes the leap second information receiving operation and fails to receive information on the future leap second, the control means changes the start timing of the next execution of the leap second information receiving operation. clock.

Images