JP2018036106A - Electronics - Google Patents

Abstract

An electronic apparatus capable of reducing power consumed by leap second reception of a satellite signal is provided. An electronic device includes a first receiving device that receives a satellite signal, a second receiving device that receives a standard radio wave, a time measuring unit that measures an internal time, a leap second update date, and an updated leap second information. A leap second acquisition period setting unit 647 that sets an acquisition period for acquiring leap second update information, and a leap second that controls the first receiver to receive satellite signals and acquire leap second update information A reception control unit 645, a time correction unit 610 that corrects the internal time based on the acquired updated leap second information, a standard radio wave that is received by controlling the second receiving device, and based on the received standard radio wave A standard radio wave reception control unit 646 that executes processing for acquiring necessity information indicating whether to acquire leap seconds, and whether the leap second reception control unit 645 needs to indicate that it is not necessary to acquire leap seconds. When information is acquired, leap second update information is acquired during the acquisition period. Does not execute the process of acquiring. [Selection] Figure 13

Description

  The present invention relates to an electronic device that receives satellite signals and standard radio waves.

Conventionally, leap second update information including leap second update date and updated leap second information is acquired by receiving satellite signals from GPS satellites. An electronic timepiece that corrects time based on information is known (see, for example, Patent Document 1).
In the electronic timepiece of Patent Document 1, the update candidate timing at which the leap second is updated (from July 1 of UTC and immediately before 00:00 on January 1) to the update candidate timing from 3 months before. Is set as the acquisition period of leap second update information, and in the acquisition period, a process of receiving satellite signals and acquiring leap second update information is executed.

JP 2011-33381 A

  However, the leap second is actually updated about once every few years, and the leap second may not be updated at the update candidate timing. For this reason, in the electronic timepiece of Patent Document 1, even though the leap second is not updated at the update candidate timing, the leap second update information acquisition period from three months before the update candidate timing to the update candidate timing is A process of receiving satellite signals and acquiring leap second update information may be executed. As described above, the electronic timepiece of Patent Document 1 has a problem that leap second reception of a satellite signal is performed wastefully and power is consumed.

  An object of the present invention is to provide an electronic device that can reduce power consumed by leap second reception of a satellite signal.

  The electronic device of the present invention includes a first receiving device that receives a satellite signal, a second receiving device that receives a standard radio wave, a time measuring unit that measures an internal time, a leap second update date, and an updated leap second information. A leap second acquisition period setting unit for setting an acquisition period for acquiring leap second update information, and a process of receiving the satellite signal by controlling the first receiving device and acquiring the leap second update information. A second reception control unit, and when the internal time is the acquired leap second update date, a time correction unit that corrects the internal time based on the acquired leap second information after the update, and the first A standard radio wave reception control unit that controls the receiving device to receive the standard radio wave, and executes a process of obtaining necessity information indicating necessity of acquisition of leap seconds based on the received standard radio wave, The leap second reception control unit indicates that it is not necessary to acquire leap seconds. If the necessity information is acquired, in the acquisition period, characterized in that it does not execute a process of acquiring the leap seconds update information.

For example, in the case of JJY, which is the Japanese standard radio wave, from one month before the update candidate timing (just before 0:00:00 on July 1 and January 1 of UTC) when leap seconds are updated, Transmission of leap second update schedule information indicating whether there is a leap second update schedule is started. In the present invention, when the standard radio wave to be received is set to JJY, the leap second acquisition period setting unit sets a period from one month before the update candidate timing to the update candidate timing as the acquisition period.
In addition, the standard radio wave reception control unit executes a process of receiving the standard radio wave at a preset time every day, and acquiring necessity information indicating whether or not leap seconds need to be acquired based on leap second update schedule information.
That is, the standard radio wave reception control unit acquires necessity information indicating that it is not necessary to acquire leap seconds when there is no leap second update schedule, and sets leap seconds when there is a leap second update schedule. Necessary information indicating that it is necessary to acquire is acquired.
In the present invention, when the necessity information indicating that it is not necessary to acquire leap seconds is acquired, the leap second reception control unit does not execute processing for acquiring leap second update information in the acquisition period. Therefore, when there is no leap second update schedule and it is not necessary to acquire leap second update information, it is possible to prevent the process of receiving satellite signals and acquiring leap second update information from being executed. The power consumption required for leap second reception of satellite signals is larger than the power consumption required for reception of standard radio waves. In the present invention, although it is necessary to receive the standard radio wave, it is possible to prevent the leap second reception of the satellite signal from being performed unnecessarily, so that power consumption can be reduced.

  In the electronic device of the present invention, the standard radio wave includes leap second update schedule information indicating whether or not a leap second is scheduled to be updated, and the standard radio wave reception control unit determines whether the necessity is based on the leap second update schedule information. It is preferable to acquire information.

  In the case of JJY, US standard radio wave WWVB, and German standard radio wave DCF77, the standard radio wave includes leap second update schedule information indicating whether or not a leap second is scheduled to be updated. For this reason, according to the present invention, when the standard radio waves to be received are JJY, WWVB, and DCF77, the necessity information can be easily acquired based on the standard radio waves.

  In the electronic device according to the aspect of the invention, it is preferable that the leap second acquisition period setting unit sets the acquisition period in a period after a predetermined period has elapsed from the transmission start timing of the leap second update schedule information.

As described above, for example, in the case of JJY, transmission of leap second update schedule information is started one month before the update candidate timing at which leap seconds are updated. In the present invention, when the standard radio wave to be received is JJY, the leap second acquisition period setting unit sets the acquisition period in a period after a predetermined period elapses from one month before the update candidate timing, for example.
According to this, since the process of acquiring leap second update information is not executed during the predetermined period, a period from one month before the update candidate timing to the update candidate timing is set as the acquisition period. As compared with, it is possible to increase the possibility that necessity information is acquired before executing the process of acquiring leap second update information. For this reason, when it is not necessary to acquire leap second update information, it can suppress more reliably that the process which acquires leap second update information is performed.

  In the electronic device of the present invention, the standard radio wave reception control unit determines that the transmission period is less than 24 hours from the transmission start timing of the leap second update schedule information to the update candidate timing at which the leap second is updated. It is preferable to execute a process of acquiring the necessity information at a predetermined time included.

In the case of DCF77, leap second update schedule information is transmitted one hour before the leap second update candidate timing. For this reason, when the standard radio wave to be received is DCF77, the leap second acquisition period setting unit sets, for example, a period from one hour before the update candidate timing to the update candidate timing as the acquisition period.
In this case, the standard radio wave reception control unit acquires necessity information at a predetermined time included in the transmission period from the transmission start timing of the leap second update schedule information to the update candidate timing, for example, one hour before the update candidate timing. Execute the process.
According to this, even if the standard radio wave to be received is DCF77, the necessity information can be acquired.
For this reason, for example, when the necessity information indicating that it is necessary to acquire leap seconds is acquired, it is displayed to the user that leap second update information is acquired, for example, by displaying that there is a leap second update schedule. Can be encouraged.

  In the electronic device of the present invention, the standard radio wave includes difference information indicating a difference between universal time (UT1) and coordinated universal time (UTC), and the standard radio wave reception control unit obtains the difference information from the standard radio wave. It is preferable to acquire, compare the acquired difference information with a preset difference threshold value, and acquire the necessity information based on a comparison result.

In the case of MSF, which is a British standard radio wave, the standard radio wave includes difference information (DUT1) indicating a difference between universal time (UT1) and coordinated universal time (UTC).
UTC is set so that the absolute value of DUT1 is 0.9 seconds or less. In order to maintain this setting, when the absolute value of DUT 1 becomes a certain value (for example, 0.6 seconds) or more, the leap second tends to be updated at the next leap second update candidate timing.
For this reason, when the standard radio wave to be received is MSF, the standard radio wave reception control unit acquires DUT1 from the standard radio wave, and compares DUT1 with a preset difference threshold value, thereby determining necessity information based on the comparison result. Can be obtained.
That is, according to the present invention, even if the standard radio wave to be received is an MSF that does not include leap second update schedule information, necessity information can be obtained by calculation.

  The electronic device of the present invention includes a first receiving device that receives a satellite signal, a second receiving device that receives a standard radio wave, a time measuring unit that measures an internal time, a leap second update date, and an updated leap second information. A leap second acquisition period setting unit for setting an acquisition period for acquiring leap second update information, and a process of receiving the satellite signal by controlling the first receiving device and acquiring the leap second update information. A second reception control unit, and when the internal time is the acquired leap second update date, a time correction unit that corrects the internal time based on the acquired leap second information after the update, and the first 2 a standard radio wave reception control unit for controlling the receiving device to receive the standard radio wave, and executing a process of obtaining necessity information indicating leap second acquisition necessity and correction value based on the received standard radio wave; Based on the necessity information, the updated leap second information is calculated. A leap second calculation acquisition unit to acquire, wherein the leap second reception control unit does not execute the process of acquiring the leap second update information in the acquisition period when the necessity information is acquired. And

For example, in the case of JJY, since the standard radio wave includes leap second update schedule information indicating whether there is a leap second update schedule and a correction value, the leap second acquisition necessity and correction value based on the standard radio wave are included. Necessity information indicating that can be acquired. Further, in the case of MSF, by comparing the value of DUT1 with the difference threshold value, it is possible to acquire necessity information indicating leap second acquisition necessity and correction value. For example, when the value of DUT1 is less than or equal to the difference threshold set on the negative side, it can be determined that the correction value is an insertion of leap seconds, and when the value of DUT1 is equal to or greater than the difference threshold set on the positive side, the correction value is It can be determined that the leap second is deleted.
For this reason, for example, when the standard radio waves to be received are JJY and MSF and necessity information is acquired, the updated leap second information is calculated based on the current leap second information and the acquired correction value. Can be obtained. That is, when the correction value is insertion of leap seconds, the updated leap second information can be calculated by adding 1 second to the current leap second information (leap second integrated value). If the correction value is deletion of leap seconds, the updated leap second information can be calculated by subtracting 1 second from the current leap second information.
For this reason, when the necessity information can be acquired, the leap second calculation acquisition unit calculates and acquires the updated leap second information, and the leap second reception control unit does not execute the process of acquiring the leap second update information. Thus, power consumption can be reduced.

  The electronic device of the present invention includes a first receiving device that receives a satellite signal, a second receiving device that receives a standard radio wave, a time measuring unit that measures an internal time, a leap second update date, and an updated leap second information. A leap second acquisition period setting unit for setting an acquisition period for acquiring leap second update information, and a process of receiving the satellite signal by controlling the first receiving device and acquiring the leap second update information. A second reception control unit, and when the internal time is the acquired leap second update date, a time correction unit that corrects the internal time based on the acquired leap second information after the update, and the first 2 a standard radio wave reception control unit for controlling the receiving device to receive the standard radio wave, and executing a process of obtaining necessity information indicating leap second acquisition necessity and correction value based on the received standard radio wave; Based on the necessity information, the updated leap second information is calculated. A leap second calculation acquisition unit to acquire, and the leap second reception control unit acquires the leap second update information in the acquisition period set immediately before the acquisition period currently set, And when the said necessity information is acquired, the process which acquires the said leap second update information is not performed in the said acquisition period currently set, It is characterized by the above-mentioned.

If leap second update information is acquired in the acquisition period set immediately before, the current leap second information is information included in the leap second update information and is determined to be accurate. it can. For this reason, for example, when the standard radio waves to be received are JJY and MSF, and necessity information is acquired, the updated leap second information is accurately obtained by calculation based on the current leap second information and the correction value. it can.
Therefore, in this case, the leap second calculation acquisition unit calculates and acquires the updated leap second information, and the leap second reception control unit does not execute the process of acquiring the leap second update information, thereby reducing power consumption. .

  In the electronic device of the present invention, the leap second reception control unit acquires the leap second update information in the acquisition period set before the currently set acquisition period, and is acquired last. When all the necessity information after the update date of the leap second update information has been acquired, it is preferable not to execute the process of acquiring the leap second update information during the currently set acquisition period.

For example, when the standard radio wave to be received is JJY, MSF, leap second update information is acquired in the acquisition period set before the currently set acquisition period, and the last acquired leap second update information When all the necessity information after the update date is acquired, the updated leap second information can be calculated and acquired. That is, the leap second information after the next update can be calculated by reflecting all the acquired correction values to the leap second information after the last acquired leap second update information.
Therefore, in this case, the leap second calculation acquisition unit calculates and acquires the updated leap second information, and the leap second reception control unit does not execute the process of acquiring the leap second update information, thereby reducing power consumption. .

1 is a schematic diagram showing an electronic timepiece according to a first embodiment of the present invention. The front view of the electronic timepiece in 1st Embodiment. The circuit diagram of the electronic timepiece in a 1st embodiment. The figure which shows the code format of JJY. The figure which shows the code format of WWVB. The figure which shows the code format of DCF77. The figure which shows the code format of MSF. The figure which shows the mainframe structure of a navigation message. The figure which shows the TLM word structure of a navigation message. The figure which shows the HOW word structure of a navigation message. The figure which shows the structure of the page 18 of the subframe 4 of a navigation message. The data structure figure of the memory | storage part in 1st Embodiment. The functional block diagram of the control part in 1st Embodiment. The flowchart which shows the automatic reception process in 1st Embodiment. The flowchart which shows the standard radio wave reception process in 1st Embodiment. The transition diagram of DUT1 in MSF. The flowchart which shows the leap second reception process in 1st Embodiment. The flowchart which shows the leap second acquisition process in 1st Embodiment. The figure which shows the execution timing of the leap second reception process in 1st Embodiment. The figure which shows the execution timing of the leap second reception process in 1st Embodiment. The functional block diagram of the control part which concerns on 2nd Embodiment of this invention. The flowchart which shows the automatic reception process in 2nd Embodiment. The figure which shows the execution timing of the leap second reception process in 2nd Embodiment. The figure which shows the execution timing of the leap second reception process which concerns on other embodiment of this invention.

Embodiments according to the present invention will be described below with reference to the drawings.
[First Embodiment]
[Outline of electronic watch]
As shown in FIG. 1, the electronic timepiece 1 includes a long wave standard radio wave from a long wave standard radio wave transmission station R and a plurality of GPS satellites S (positional information satellites) orbiting around the earth in a predetermined orbit. It is configured to be able to receive both the satellite signal and the satellite signal.
The electronic timepiece 1 is configured to receive a standard radio wave from the long wave standard radio wave transmitting station R and acquire time information of a country in which the transmitting station R is installed.
In addition, the electronic timepiece 1 performs reception processing (time reception processing) in the timekeeping mode, reception processing (positioning reception processing) in the positioning mode, and reception processing (leap second reception processing) in the leap second mode. Is configured to run. Here, the time measurement mode is a mode in which the satellite signal is received from at least one GPS satellite S and the internal time information of the electronic timepiece 1 is corrected based on the time information included in the satellite signal. The positioning mode refers to receiving satellite signals from three or more (preferably four or more) GPS satellites S, and using the orbit information and time information included in the satellite signals, each GPS satellite S from the electronic timepiece 1. In this mode, the current position of the electronic timepiece 1 is obtained by calculating the distance to the timepiece, and the time zone data at the time indicated by the electronic timepiece 1 is corrected based on the current position of the electronic timepiece 1. The leap second mode is a mode for receiving satellite signals from at least one GPS satellite S and acquiring leap second update information included in the satellite signals.

[Configuration of electronic clock]
Next, the configuration of the electronic timepiece 1 capable of receiving standard radio waves and satellite signals will be described. FIG. 2 is a front view of the electronic timepiece 1.
The electronic timepiece 1 includes an exterior case 30 that is a watch case, a cover glass, and a back cover. The exterior case 30 is configured by fitting a bezel 32 to a cylindrical case 31. The exterior case 30 may be a one-piece case in which the case and the back cover are integrated.
An A button 36, a B button 37, and a crown 38 are provided on the side surface of the exterior case 30.

Of the two openings of the case 31, the opening on the front side is closed with a cover glass via the bezel 32, and the opening on the back side is closed with a back cover. On the inner peripheral side of the bezel 32, a disk-shaped dial plate 11 is disposed via a ring-shaped dial ring 35 made of plastic.
A metal material such as SUS (stainless steel), titanium alloy, aluminum, or BS (brass) is used for the case 31 and the back cover. The bezel 32 may be made of the same metal material as the case 31, but is preferably made of ceramic that does not affect radio wave reception.

  In the outer case 30, a planar antenna (patch antenna) 40 is disposed as a satellite signal antenna for receiving satellite signals, and a bar antenna 150 is disposed as a standard radio wave antenna for receiving standard radio waves. In the present embodiment, the planar antenna 40 is disposed at the 12 o'clock position relative to the plane center of the dial 11 and the bar antenna 150 is disposed at the 9 o'clock position in plan view when the electronic timepiece 1 is viewed from the cover glass side. Yes.

[Internal structure of electronic watch]
Next, the internal structure built in the exterior case 30 of the electronic timepiece 1 will be described.
The exterior case 30 accommodates a dial plate 11, a dial ring 35, a movement (not shown) and the like made of a translucent member.

[Dial plate]
The dial plate 11 is made of a plastic material such as polycarbonate having non-conductivity and transmitting at least part of light, and is provided on the dial plate 11 at the 6 o'clock position side. The sub dial 12, the second sub dial 13 provided on the dial plate 11 on the 10 o'clock to 11 o'clock side, and the calendar wheel 20 provided on the dial plate 11 on the 3 o'clock position side for visually recognizing the calendar wheel 20. And a window 15.

  A through-hole in which the pointer shaft 27 is disposed is formed at the center of the dial plate 11. The pointer shaft 27 has a pointer (second hand) 21, a pointer (minute hand) 22, and a pointer (hour hand) for indicating the local time. 23 is attached. For this reason, the pointer shaft 27 is composed of three pointer shafts (rotating shafts) to which the pointers 21, 22, and 23 are attached.

  The first sub dial 12 is formed with a through-hole in which the pointer shaft 28 is disposed, and a pointer (minute hand) 24 and a pointer (hour hand) 25 for indicating the home time are attached to the pointer shaft 28. For this reason, the pointer shaft 28 includes two pointer shafts (rotating shafts) to which the pointers 24 and 25 are attached.

The second sub-dial 13 is formed with a through hole in which the pointer shaft 29 is disposed, and the pointer shaft 29 is attached with a pointer 26 that indicates the day of the week and various information.
On the right half of the second sub-dial 13, characters “S, M, T, W, T, F, S” indicating the day of the week are written. In the 7 o'clock direction of the left half of the second sub-dial 13 (7 o'clock direction when viewed from the pointer shaft 29 of the pointer 26), “DST” indicating that summer time is set and “DST” indicates that it is not set. “・” Is displayed. In addition, a crescent-shaped scale indicating the remaining battery level is written from 9 o'clock to 8 o'clock in the left half of the second sub-dial 13, and an airplane mark indicating airplane mode is shown at 10 o'clock, At the 11 o'clock position, the time reception process is being executed, the character “1” indicated by the pointer 26 when the time measurement reception process is successful, the position reception process being executed, A character “4+” indicated by the pointer 26 when the positioning reception process is successful is described.
Therefore, the information display unit including the second sub dial 13 and the hands 26 switches between the day of the week display and information such as the clock reception mode and the remaining battery level. Switching between the day of the week display and the various information displays by the hands 26 can be performed by appropriately operating the A button 36 and the B button 37.

[Dial ring]
A dial ring 35 formed of a synthetic resin (for example, ABS resin) which is a non-conductive member is provided on the surface side of the dial 11. The dial ring 35 is disposed along the periphery of the dial plate 11, and an inner peripheral surface is an inclined surface (conical surface), and a scale that divides one circumference into 60 is printed on the inclined surface.

  On the surface of the bezel 32, time difference information representing a time difference with Coordinated Universal Time (UTC) is expressed in numbers. Note that the time difference information may be expressed by a number and a symbol other than a number. Furthermore, the city information representing the representative city name of the time zone may be written in the time difference information. The city information can be represented by a three-letter code in which the city name is abbreviated with a three-letter alphabet, for example, “TYO (Tokyo)”.

[Movement]
The movement includes a solar battery 80 (see FIG. 3), a calendar wheel 20, a drive mechanism (not shown), a circuit board (not shown), a secondary battery 130 such as a lithium ion battery (see FIG. 3), a planar antenna (patch antenna). 40) The bar antenna 150 is provided.

The drive mechanism includes a step motor and a gear train such as a gear.
The drive mechanism of the present embodiment includes first to fifth drive mechanisms. The first drive mechanism includes a first step motor and a first wheel train that drive the second hand 21. The second drive mechanism includes a second step motor and a second wheel train that drive the minute hand 22 and the hour hand 23. The third drive mechanism includes a third step motor and a third wheel train that drive the minute hand 24 and the hour hand 25 for home time. The fourth drive mechanism includes a fourth step motor that drives the hands 26 and a fourth wheel train. The fifth drive mechanism includes a fifth step motor and a fifth wheel train that drive the calendar wheel 20.

  The circuit board includes a power supply control IC, a clock drive control IC, a planar antenna 40, a bar antenna 150, a satellite signal reception IC, a GPS-IC 501 (see FIG. 3), and a crystal with a temperature compensation circuit. An oscillation circuit (TCXO) 530 (see FIG. 3), a flash memory 540 (see FIG. 3) as a memory IC, a standard radio wave receiving IC 401 (see FIG. 3), a filter crystal 410 (see FIG. 3), A first regulator 72 (see FIG. 3) and a second regulator 73 (see FIG. 3) are mounted.

  As will be described later, the power control IC performs charge control from the solar battery 80 to the secondary battery 130 to prevent overcharge and overdischarge, and the solar battery 80 and the secondary battery 130. And a voltage detection circuit 74 for measuring the voltage or current. The voltage detection circuit 74 also has a function of detecting that the electronic timepiece 1 is disposed outdoors by detecting that the solar cell 80 has been exposed to strong light such as sunlight.

The GPS-IC 501 includes an RF unit 510 and a baseband unit 520, as will be described later. The GPS-IC 501, the TCXO 530, and the flash memory 540 constitute a later-described GPS receiving circuit unit 500. The standard radio wave receiving IC 401 and the filter crystal 410 constitute a standard radio wave receiving circuit unit 400 described later.
The flash memory 540 stores a GPS reception firmware program and time zone data for determining a time zone from position information calculated in the positioning reception process.

The planar antenna 40 receives satellite signals from the GPS satellite S and is connected to the GPS-IC 501.
The GPS satellite S transmits a satellite signal with right-handed circular polarization. Therefore, the planar antenna 40 of the present embodiment is configured by a patch antenna (also referred to as a microstrip antenna) that has excellent circular polarization characteristics.
The planar antenna 40 of this embodiment is a patch antenna in which a conductive antenna electrode portion is laminated on a ceramic dielectric substrate.

The bar antenna 150 receives a standard radio wave from the long wave standard radio wave transmission station R, and is connected to the standard radio wave receiving IC 401.
The bar antenna 150 of the present embodiment is a bar antenna including an antenna core formed by laminating a plurality of cobalt-based amorphous metal foils as a magnetic foil material, and a coil wound around the antenna core.

The solar cell 80 converts light energy into electric energy (electric power) and outputs it.
The solar cell 80 includes a surface protective material having translucency, a transparent electrode (TCO: Transparent Conductive Oxide), an amorphous silicon semiconductor thin film (a-si), an aluminum back electrode, a resin film base, The back surface protective material is laminated and configured.
The solar cell 80 of this embodiment is divided into a plurality of cells, and each cell is connected in series.

The calendar wheel 20 is formed in a ring shape by a non-conductive member such as plastic, and the date is displayed on the surface. The calendar wheel 20 is not limited to a date wheel, and may be a day wheel that displays the day of the week or a month wheel that displays the month.
The secondary battery 130 is a lithium ion battery formed in a planar circular shape. The secondary battery 130 supplies power to the drive mechanism, the standard radio wave receiving circuit unit 400, the GPS receiving circuit unit 500, and the like.

[Circuit configuration of electronic watch]
FIG. 3 is a schematic diagram showing a circuit configuration of the electronic timepiece 1.
The electronic timepiece 1 mainly includes a standard radio wave receiver 4 that receives standard radio waves and acquires time information, a satellite signal receiver 5 that receives satellite signals and acquires time information and position information, and a control display unit. 6 and a power supply unit 7.

Here, the standard radio wave can be received only in a specific area in the world. That is, JJY40 and JJY60 can be received in an area centered in Japan, WWVB can be received in an area centered in the United States, DCF77 can be received in an area centered in Germany, and MSF can be received in an area centered in the United Kingdom.
On the other hand, the satellite signal transmitted from the GPS satellite S has an overwhelmingly large receivable area compared to the standard radio wave reception area, and can be received anywhere on the earth.

[Standard time code format]
The time information (time code) of the standard radio wave is configured according to a predetermined time information format (time code format) for each country.
For example, in the JJY time code format shown in FIG. 4, one signal is transmitted every second, and one record (one frame) is formed in 60 seconds. That is, one frame is 60-bit data. Data items include the minute, hour of the current time, the date of the current year from January 1, the year (the last two digits of the year), the day of the week, and leap seconds. The value of each item is composed of a combination of numerical values assigned every second (each bit), and this combination is determined from the type of signal.
Each item is assigned a binary number “1”, a binary number “0”, or a marker.
A signal representing “1” is a signal having a pulse width of about 0.5 seconds, a signal representing “0” is a signal having a pulse width of about 0.8 seconds, and a signal P indicating each marker is about 0 A signal with a pulse width of 2 seconds.
As shown in FIGS. 5 to 7, even in the time code format of WWVB, DCF77, and MSF, one signal is transmitted every second, and one record is made every 60 seconds. In each of these standard radio waves, the data items and the pulse width (duty) of each signal are set according to the type of the standard radio wave.

Here, as shown in FIG. 4, the JJY code format includes information on leap second information as the next leap second update candidate timings (July 1, 00:00:00 and January 1, 0 in UTC). The leap second update schedule information LS1 (53th second) indicating whether or not the leap second is scheduled to be updated (just before the hour 0 minute 0 second), and the leap second update schedule indicating the correction value (insertion or deletion of the leap second). Information LS2 (54th second) is included.
When the leap second update schedule information LS1 is “1”, it indicates that the leap second is updated at the next update candidate timing. When the leap second update schedule information LS1 is “0”, it indicates that the leap second is not updated at the next update candidate timing.
Further, when the leap second update schedule information LS2 is “1”, it indicates that the correction value is insertion of leap seconds. Further, when the leap second update schedule information LS2 is “0”, it indicates that the correction value is deletion of leap seconds.
The leap second update schedule information LS1, LS2 is transmitted one month before the next update candidate timing.

As shown in FIG. 5, the WWVB code format includes leap second update schedule information L1 (the 55th second) indicating whether or not there is a leap second update schedule at the next update candidate timing, as the leap second information. The 56th second includes information L2 indicating whether it is a leap year.
When the leap second update schedule information L1 is “1”, it indicates that the leap second is updated at the next update candidate timing. When the leap second update schedule information L1 is “0”, it indicates that the leap second is not updated at the next update candidate timing.
The leap second update schedule information L1 is transmitted one month before the next update candidate timing.

As shown in FIG. 6, the code format of the DCF 77 includes leap second update schedule information A2 (19th second) indicating whether or not there is a leap second update schedule at the next update candidate timing.
When the leap second update schedule information A2 is “1”, it indicates that the leap second is updated at the next update candidate timing. When the leap second update schedule information A2 is “0”, it indicates that the leap second is not updated at the next update candidate timing.
The leap second update schedule information A2 is transmitted one hour before the next update candidate timing.

As shown in FIG. 7, the MSF code format includes difference information DUT1 (1st to 16th seconds) indicating a difference (UTC-UT1) between universal time (UT1) and Coordinated Universal Time (UTC). It is.
The data of the first to eighth seconds is used when the difference information DUT1 is positive, and indicates the difference information DUT1 in units of 100 ms in the range of +100 ms to +800 ms. For example, when the data for the first second is “1” and the data for the second to eighth seconds is “0”, it indicates that the difference information DUT1 is +100 ms. Further, when the data in the first second and second seconds is “1” and the data in the third to eighth seconds is “0”, it indicates that the difference information DUT1 is +200 ms. Similarly, the difference information DUT1 increases by 100 ms each time the data of the third to eighth seconds sequentially becomes “1”.
The data of the 9th to 16th seconds is used when the difference information DUT1 is negative, and indicates the difference information DUT1 in units of 100 ms in the range of −100 ms to −800 ms. For example, when the 9th data is “1” and the 10th to 16th data is “0”, the difference information DUT1 is −100 ms. Further, when the data at the 9th and 10th seconds is “1” and the data at the 11th to 16th seconds is “0”, the difference information DUT1 is −200 ms. Similarly, every time the data in the 12th to 16th seconds sequentially becomes “1”, the difference information DUT1 decreases by 100 ms.
The difference information DUT1 is always transmitted.

[Navigation message of satellite signal]
8 to 11 are diagrams for explaining the configuration of the navigation message of the satellite signal.
As shown in FIG. 8, the navigation message is configured as data in which a main frame having a total number of 1500 bits is used as one unit. The main frame is divided into five sub-frames 1 to 5 each having 300 bits. Data of one subframe is transmitted from each GPS satellite S in 6 seconds. Accordingly, data of one main frame is transmitted from each GPS satellite S in 30 seconds.

  Subframe 1 includes weekly number data and satellite correction data including satellite health status. The week number data is information representing a week including the current GPS time information. The starting point of the GPS time information is January 6, 1980, 00:00:00 in UTC (Coordinated Universal Time), and the week starting on this day is the week number 0. Week number data is updated on a weekly basis. The satellite health state is a code indicating whether or not there is an abnormality in the satellite, and by checking this code, it is possible to control so as not to use the signal of the satellite with the abnormality.

  Of the five sets of subframes, subframes 1 to 3 contain information specific to each satellite, so the same content is repeatedly transmitted each time. Specifically, the clock correction information of the transmitting satellite itself, Orbital information (ephemeris) is included. On the other hand, subframes 4 and 5 include orbit information (almanac) and ionosphere correction information of all satellites, and these are divided into page units of pages 1 to 25 and accommodated in the subframes because of the large number of data. Is done. Since it takes 25 frames to transmit the contents of all pages, it takes 12 minutes and 30 seconds to receive all the information of the navigation message.

Further, in the subframes 1 to 5, from the top, a TLM (Telemetry) word storing 30-bit TLM (Telemetry word) data and a 30-bit HOW (hand over word) are stored.
) A HOW word in which data is stored is included.
Therefore, TLM words and HOW words are transmitted from the GPS satellite S at intervals of 6 seconds, whereas satellite correction data such as week number data, ephemeris parameters, and almanac parameters are transmitted at intervals of 30 seconds.

As shown in FIG. 9, the TLM word includes preamble data, a TLM message, reserved bits, and parity data.
As shown in FIG. 10, the HOW word includes GPS time information called TOW (Time of Week, also referred to as “Z count”). In the Z count data, the elapsed time from 0 o'clock every Sunday is displayed in seconds, and it returns to 0 at 0 o'clock on the next Sunday. That is, the Z count data is information in units of seconds indicated every week from the beginning of the week. This Z count data indicates GPS time information at which the first bit of the next subframe data is transmitted. For example, the Z count data of subframe 1 indicates GPS time information at which the first bit of subframe 2 is transmitted. The HOW word also includes 3-bit data (ID code) indicating the ID of the subframe. That is, ID codes “001”, “010”, “011”, “100”, and “101” are included in the HOW words of subframes 1 to 5 shown in FIG.

As shown in FIG. 11, the page 18 of the subframe 4 includes UTC correction parameters in the words 6 to 10. In the words 9 and 10 of the subframe 4, the current leap second information (integral value of leap seconds) Δt _LS , the updated leap second information Δt _LSF, and the date when the leap second is updated (leap second) Week number data (WN _LSF ) and day number data (DN) indicating the (update date). Among these, the updated leap second information Δt _LSF , week number data (WN _LSF ) and day number data (DN) constitute leap second update information.

[Standard radio wave receiver]
The standard radio wave receiver 4 (second receiver) includes a bar antenna 150 and a standard radio wave receiver circuit unit 400 as shown in FIG. The bar antenna 150 receives standard radio waves and outputs the received standard radio waves to the standard radio wave receiving circuit unit 400. The standard radio wave receiving circuit unit 400 demodulates the standard radio wave reception signal received by the bar antenna 150 and outputs the demodulated signal to the control unit 61 of the control display unit 6 as a TCO (Time Code Out) signal.

  The standard radio wave receiving circuit unit 400 includes a standard radio wave receiving IC 401 and a filter crystal 410. The standard radio wave receiving IC 401 includes a tuning circuit 411, an amplifier circuit 412, a mixer circuit 413, an IF (Intermediate Frequency) amplifier circuit 414 using a filter crystal 410, an envelope detection circuit 415, and an automatic gain control circuit. AGC (Auto Gain Control) circuit 416, binarization circuit 417, PLL (Phase Locked Loop) circuit 418, and VCO (Voltage Controlled Oscillator) 419. The standard radio wave receiving circuit unit 400 is a general circuit that receives standard radio waves.

The tuning circuit 411 includes a capacitor, and the tuning circuit 411 and the bar antenna 150 constitute a parallel resonance circuit. The tuning circuit 411 is configured to be able to select and receive standard radio waves of JJY (JJY40 and JJY60), WWVB, DCF77, and MSF.
As will be described later, when the position information (latitude, longitude) of the electronic timepiece 1 is obtained by the satellite signal receiving device 5, the control unit 61 uses a standard radio wave selection signal based on the position information as a standard signal. Output to the radio wave receiving circuit unit 400. The tuning circuit 411 of the standard radio wave receiving circuit unit 400 automatically sets the standard radio wave to be received according to the control signal.
When the position information of the electronic timepiece 1 is not obtained by the satellite signal receiving device 5, the user operates the operation member such as the crown 38 to select the time zone (time difference), so that the standard of the reception target is obtained. You can set the radio wave.

The amplifier circuit 412 adjusts the gain according to the signal (AGC voltage) input from the AGC circuit 416, amplifies the reception signal input from the tuning circuit 411 to a constant amplitude, and inputs the amplified signal to the mixer circuit 413.
The mixer circuit 413 mixes the received signal with the signal of the VCO 419 and down-converts it to IF (Intermediate Frequency).
The IF amplifier circuit 414 further amplifies the reception signal input from the mixer circuit 413 and outputs the amplified signal to the envelope detection circuit 415.
The envelope detection circuit 415 includes a rectifier (not shown) and a low-pass filter (LPF) (not shown), and rectifies and filters an input received signal and filters an envelope signal obtained by filtering. , Output to the AGC circuit 416 and the binarization circuit 417.
The AGC circuit 416 outputs a signal for determining the gain when the amplification circuit 412 amplifies the reception signal based on the envelope signal input from the envelope detection circuit 415.
The binarization circuit 417 compares the envelope signal input from the envelope detection circuit 415 with a reference voltage (threshold) and outputs a binarized signal, that is, a TCO signal.

[Satellite signal receiver]
The satellite signal receiving device 5 (first receiving device) includes a planar antenna 40, a filter (SAW) 111, and a GPS receiving circuit unit (receiving module) 500.
The filter 111 is a band-pass filter and passes a 1.5 GHz satellite signal. Further, an LNA (low noise amplifier) that improves reception sensitivity may be separately incorporated between the planar antenna 40 and the filter 111. The filter 111 may be incorporated in the GPS receiving circuit unit 500.

The GPS receiving circuit unit 500 processes the satellite signal that has passed through the filter 111, and includes a GPS-IC 501 that is a satellite signal receiving IC, a crystal oscillation circuit (TCXO) 530 with a temperature compensation circuit, and a flash memory 540. It has.
The GPS-IC 501 includes an RF unit (Radio Frequency) 510 and a baseband unit 520.
The RF unit 510 includes a PLL circuit 511, a VCO (Voltage Controlled Oscillator) 512, an LNA (Low Noise Amplifier) 513, a mixer 514, an IF amplifier 515, an IF filter 516, an ADC (A / D converter) 517, and the like. .

The satellite signal that has passed through the filter 111 is amplified by the LNA 513, mixed with the signal of the VCO 512 by the mixer 514, and down-converted to IF (Intermediate Frequency).
The IF mixed by the mixer 514 passes through an IF amplifier 515 and an IF filter 516, and is converted into a digital signal by an ADC (A / D converter) 517.

The baseband unit 520 includes a DSP (Digital Signal Processor) 521, a CPU (Central Processing Unit) 522, an RTC (Real Time Clock) 523, and an SRAM (Static Random Access Memory) 524. The baseband unit 520 is also connected with a crystal oscillation circuit with temperature compensation circuit (TCXO) 530, a flash memory 540, and the like.
The baseband unit 520 can acquire GPS time information and position information by inputting a digital signal from the ADC 517 of the RF unit 510 and performing correlation processing, positioning calculation, or the like.
The clock signal for the PLL circuit 511 is generated from the TCXO 530.

The flash memory 540 stores a time difference database in which position information (latitude, longitude) and time difference information (time zone data) are associated with each other. Therefore, if the position information of the current location can be calculated by receiving the satellite signal, the time difference information (time zone data) of the point received from the latitude and longitude and the time difference database can be detected. In place of the flash memory 540, an EEPROM (Electrically Erasable Programmable Read-Only Memory) may be used.
Then, the GPS reception circuit unit 500 outputs the GPS time information and the detected time difference information to the control unit 61 of the control display unit 6.
In this embodiment, the time difference database is stored in the flash memory 540 of the GPS receiving circuit unit 500. However, a nonvolatile memory such as an EEPROM or a flash memory is provided in the control unit 61 of the control display unit 6, and this nonvolatile memory is provided. The time difference database may be stored in the sex memory.

[Control display section]
The control display unit 6 includes a control unit (CPU) 61, a drive circuit 62 for driving the hands 21 to 26, a crystal resonator 63, a time display unit, an information display unit, and the like.
The control unit 61 includes an RTC 66, a ROM 67, and a storage unit 68. The RTC 66 is a time measuring unit that measures internal time information and the like using a reference signal output from the crystal resonator 63. The ROM 67 stores various programs executed by the control unit 61.
The storage unit 68 stores GPS time information and time difference information (time zone data) output from the GPS receiving circuit unit 500, and a TCO signal (standard radio wave time information) output from the standard radio wave receiving circuit unit 400. .

[Storage unit]
As shown in FIG. 12, the storage unit 68 includes a time data storage unit 650, a time zone data storage unit 660, a standard radio leap second storage unit 670, and a satellite signal leap second storage unit 680.
The time data storage unit 650 stores reception time data 651, leap second update data 652, internal time data 653, display time data 654, and time zone data 655.
The reception time data 651 stores time information (GPS time information) acquired from satellite signals. The reception time data 651 is normally updated every second by the RTC 66, and is corrected by the acquired time information when a satellite signal is received.
The leap second update data 652 stores current leap second information (integrated value of leap seconds) acquired from the satellite signal.

Internal time information is stored in the internal time data 653. When the satellite signal is received, the internal time information is updated by the GPS time information stored in the reception time data 651 and the “current leap second information” stored in the leap second update data 652. . That is, UTC is stored in the internal time data 653.
Further, when the standard time signal is received, the internal time information is updated by a time obtained by subtracting a time difference with respect to UTC of the standard time from the time of the standard time. For example, in the case of JJY, the internal time data 653 stores the time obtained by subtracting 9 hours, which is the time difference of Japan, from the time of the standard radio wave. In this case, the time information of the reception time data 651 is updated with a time obtained by subtracting the current leap second information from the internal time.
This internal time data 653 is updated every second by the RTC 66.

  In the display time data 654, time information obtained by adding the time zone data (time difference information) of the time zone data 655 to the internal time information of the internal time data 653 is stored. The time zone data 655 may be set by manual selection by the user or may be set by time zone data output from the GPS receiving circuit unit 500.

  In the time zone data storage unit 660, the indication position of the pointer 21 and time zone data are stored in association with each other. Therefore, when the user moves the hands 21 by operating the crown 38 and selects the time difference information number for which the local time is desired, the control unit 61 searches the time zone data selected by the user from the time zone data storage unit 660. And set in the time zone data 655.

In the standard radio leap second storage unit 670, necessity information indicating the necessity of acquisition of leap seconds acquired by a standard radio wave reception process S50 described later and an acquisition time are stored in association with each other. Note that the acquisition time may not be stored.
When the internal time reaches the leap second update candidate timing, the standard radio leap second storage unit 670 is initialized, and the stored necessity information and acquisition time are deleted.

The satellite signal leap second storage unit 680 stores leap second update information acquired by a leap second reception process S20 described later.
The satellite signal leap second storage unit 680 is initialized when the internal time reaches the update candidate timing of leap seconds, and the stored leap second update information is deleted.

  The storage unit 68 does not store orbit information (almanac, ephemeris) of the GPS satellite S. The electronic timepiece 1 is a wristwatch, and the capacity of the storage unit 68 is also limited, and the capacity of the secondary battery 130 is also limited, so that it is difficult to perform long-time reception for acquiring trajectory information. Because. Therefore, the reception processing of the electronic timepiece 1 is performed in a cold start state that does not have trajectory information.

The control unit 61 switches and activates the standard radio wave receiver 4 and the satellite signal receiver 5 by outputting a control signal to the standard radio wave receiver 4 and the satellite signal receiver 5. A GPS satellite signal has a frequency as high as about 1.5 GHz and a received signal intensity as weak as about 1/100 compared to a standard radio wave. For this reason, the GPS satellite signal reception processing by the satellite signal reception device 5 requires about 500 times as much power as the standard radio wave reception processing by the standard radio wave reception device 4.
For this reason, the controller 61 does not operate the standard radio wave receiver 4 and the satellite signal receiver 5 at the same time, but switches and starts them.
The electronic timepiece 1 of the present embodiment includes the standard radio wave receiver 4, the satellite signal receiver 5, and the control display unit 6 as described above, so that the electronic timepiece 1 is based on the standard radio wave received from the long wave standard radio wave transmitter R. The time information can be automatically corrected, and the time information can be automatically corrected based on the satellite signal received from the GPS satellite S.

[Power supply unit]
The power supply unit 7 includes a solar battery 80, a charge control circuit 71, a secondary battery 130, a first regulator 72, a second regulator 73, and a voltage detection circuit 74.

When the solar cell 80 generates light upon incidence of light, the secondary battery 130 is charged by supplying the power obtained by the photovoltaic power generation to the secondary battery 130 through the charge control circuit 71.
The secondary battery 130 supplies driving power to the control display unit 6 and the standard radio wave receiving circuit unit 400 via the first regulator 72, and supplies driving power to the GPS receiving circuit unit 500 via the second regulator 73.

The voltage detection circuit 74 monitors the voltage of the secondary battery 130 and outputs it to the control unit 61. Since the battery voltage detected by the voltage detection circuit 74 is input, the control unit 61 can grasp the voltage of the secondary battery 130 and control the reception process.
Further, the charge control circuit 71 can be controlled to detect the voltage of the solar battery 80 with the voltage detection circuit 74 in a state where the solar battery 80 and the secondary battery 130 are disconnected under the control of the control unit 61. In this case, the voltage detection circuit 74 can detect the power generation voltage (power generation amount) of the solar battery 80 without being affected by the voltage of the secondary battery 130. Therefore, the voltage detection circuit 74 constitutes a power generation amount detection unit that detects the power generation amount of the solar cell 80, and this power generation amount is input to the control unit 61. For this reason, the control part 61 can determine whether the electronic timepiece 1 is arrange | positioned outdoors based on the electric power generation amount of the solar cell 80. FIG.

[Configuration of control unit]
Next, the configuration of the control unit 61 will be described based on FIG. FIG. 13 is a functional block realized mainly by a program executed in the control unit 61.
The control unit 61 includes a time correction unit 610, a display control unit 620, a voltage detection control unit 630, and a reception control unit 640.
The time correction unit 610 corrects the internal time information using the time information acquired by the standard radio wave receiver 4 or the satellite signal receiver 5 and the time zone data acquired by the satellite signal receiver 5.

In the normal mode, the display control unit 620 controls the drive circuit 62 based on the time information of the display time data 654, displays the local time (hour, minute, second) with the hands 21 to 23. 26 displays the day of the week (Sun-Sat). Further, the display control unit 620 controls the display of the hands 26 according to the reception control state and the like. The display control unit 620 controls the drive circuit 62 based on time information obtained by adding time zone data (time difference information) of home time set by the user to the time information of the internal time data 653, for example. , 25 display the home time (hour, minute).
The voltage detection control unit 630 operates the voltage detection circuit 74 to detect the voltage of the secondary battery 130, that is, the remaining battery level and the power generation amount of the solar battery 80. The voltage detection control unit 630 detects the voltage by operating the voltage detection circuit 74 at regular time intervals. The voltage detection control unit 630 also controls the operation of the charge control circuit 71.

[Reception control unit]
The reception control unit 640 includes a reception mode selection unit 641, a satellite signal reception control unit 642, a standard radio wave reception control unit 646, and a leap second acquisition period setting unit 647. The satellite signal reception control unit 642 includes a time measurement reception control unit 643, a positioning reception control unit 644, and a leap second reception control unit 645.

  The reception mode selection unit 641 determines that the reception operation by the A button 36 or the automatic reception condition set in advance is satisfied, and the satellite signal reception mode (time measurement mode, positioning mode, leap second mode), Select the standard radio wave reception mode. The reception mode selection unit 641 selects the time measurement mode when the A button 36 is pressed for a first predetermined time (for example, 3 seconds or more and less than 6 seconds), and the A button 36 is set for a second predetermined time (for example, 6 seconds). When the button is pressed, select the positioning mode. In addition, the reception mode selection unit 641 selects the leap second mode when the voltage detection circuit 74 detects that the electronic timepiece 1 is placed outdoors, and when the predetermined leap second reception condition is satisfied. select. When the leap second reception condition is not met, the timekeeping mode is normally selected, and the positioning mode is selected only once after the reception off mode of the electronic timepiece 1 is canceled. The reception mode selection unit 641 selects a standard radio wave reception mode at a preset standard radio wave reception time.

The satellite signal reception control unit 642 is activated when the reception mode selection unit 641 selects the satellite signal reception mode.
When the time measurement mode is selected, the satellite signal reception control unit 642 operates the time measurement reception control unit 643, and the time measurement reception control unit 643 controls the satellite signal reception device 5 to perform time reception processing. Do.
When the positioning mode is selected, the satellite signal reception control unit 642 operates the positioning reception control unit 644, and the positioning reception control unit 644 controls the satellite signal reception device 5 to perform positioning reception processing.
When the leap second mode is selected, the satellite signal reception control unit 642 operates the leap second reception control unit 645, and the leap second reception control unit 645 controls the satellite signal reception device 5 to receive the leap second reception. Process S20 is performed.

  The standard radio wave reception control unit 646 is activated when the standard radio wave reception mode is selected by the reception mode selection unit 641. The standard radio wave reception control unit 646 controls the standard radio wave receiver 4 to perform standard radio wave reception processing S50.

The leap second acquisition period setting unit 647 sets the leap second update information acquisition period (leap second update information acquisition period) according to the standard radio wave set as the reception target. As described above, the standard radio wave to be received is set based on the time zone data obtained by the positioning reception process or the time zone data set by the user's selection. That is, the time zone data 655 in the storage unit 68 is set. For example, when +9 hours are set in the time zone data 655, JJY is set as a reception target, and when +1 hours are set, DCF 77 is set as a reception target. If the previous reception process of the standard radio wave is successful, the previous standard radio wave may be set.
Specifically, when the standard radio wave set as the reception target is JJY, WWVB, or DCF77, the leap second acquisition period setting unit 647 starts the next leap second from the timing when transmission of leap second update schedule information is started. The period until the update candidate timing is set as the leap second update information acquisition period.
Further, when the standard radio wave set as the reception target is MSF, the leap second acquisition period setting unit 647 acquires the leap second update information from one month before the update candidate timing to the update candidate timing. Set to period.

[Automatic reception processing procedure]
Next, in the present embodiment, an automatic reception process that performs a reception process when a preset automatic reception condition is satisfied will be described.
The control unit 61 executes the process shown in FIG. 14 when the electronic timepiece 1 is not set to a mode (in-flight mode) that prohibits the automatic reception process. The automatic reception process of FIG. 14 is executed at a preset time, for example, at midnight (local time).

Note that the voltage detection circuit 74 is operated at regular intervals, for example, at intervals of 60 seconds, under the control of the voltage detection control unit 630. Since the voltage detection circuit 74 detects the battery voltage of the secondary battery 130 at intervals of 60 seconds, the control unit 61 always knows the state of the remaining battery level (charged amount) of the secondary battery 130.
Further, even if the voltage detection control unit 630 performs the standard radio wave reception process S50 that consumes less current than the satellite signal reception process as the battery voltage of the secondary battery 130, the control unit 61 may go down the system. The voltage is set to a predetermined value 1. The predetermined value 1 is 3.4 V, and this value may be set based on the discharge characteristics of the secondary battery 130.
In this embodiment, the remaining battery level of the secondary battery 130 is detected by detecting the battery voltage of the secondary battery 130. However, for example, a means for detecting charge / discharge current for the secondary battery 130 is also added. If the determination is made based on the combination of the charge / discharge current amount and the battery voltage, the accuracy of detection of the remaining battery level is further increased.

The controller 61 determines whether or not the battery voltage of the secondary battery 130 is a predetermined value 1 or more (S1).
If the battery voltage is less than the predetermined value 1 and the determination is “NO” in S1, the control unit 61 starts the irregular movement by the drive circuit 62 (S2) and maintains the reception prohibited state (S3). The irregular movement is a BLD movement called a battery voltage drop display (Battery Low Display), a battery life indicator, etc. For example, the pointer 21 is moved every 2 seconds for 2 seconds, The operation is different from normal operation. Accordingly, the user can confirm that the voltage of the secondary battery 130 has decreased, and can charge the solar battery 80 by applying light.
During irregular operation, the control unit 61 periodically checks the battery voltage by the voltage detection circuit 74, for example, every second, and executes the process of S1. And the control part 61 continues the irregular hand movement of S2, and the reception prohibition state of S3 until it determines with "YES" by S1.

  When the control unit 61 determines that the battery voltage is equal to or greater than the predetermined value 1 and “YES” in S <b> 1, the reception mode selection unit 641 determines whether or not the local time is a preset standard radio time reception time. Determine (S4). The standard time reception time is set at 2:00 in the night, which is a time zone with less noise. In addition, the standard radio wave reception time may be set to a plurality of times such as 2 o'clock, 3 o'clock, and 4 o'clock. In this case, if the reception process fails at 2 o'clock, the reception process may be performed at 3 o'clock, and if the reception process also fails at 3 o'clock, the reception process may be performed at 4 o'clock. As will be described in detail later, when the standard radio wave set as the reception target is DCF 77, the control unit 61 sets the standard radio time reception time only on July 1 and January 1 in local time. Change to midnight.

When the local time is the standard radio wave reception time and it is determined “YES” in S4, the display control unit 620 stops the hand movement of the hands 21 to 26 by the drive circuit 62 (S5). At this time, the indicator 26 or the like may indicate that the standard radio wave is being received.
Next, the reception mode selection unit 641 selects the reception mode of the standard radio wave. As a result, the standard radio wave reception control unit 646 operates and executes standard radio wave reception processing S50.

[Standard radio wave reception processing]
FIG. 15 is a flowchart showing the standard radio wave reception process S50.
When the standard radio wave reception process S50 is started, the standard radio wave reception control unit 646 selects the type of standard radio wave (receiving station) (S51). As described above, the standard radio wave to be received is set based on the time zone data obtained by the positioning reception process or the time zone data set by the user's selection. That is, the time zone data 655 in the storage unit 68 is set. For example, when +9 hours are set in the time zone data 655, JJY is set as a reception target, and when +1 hours are set, DCF 77 is set as a reception target. If the previous reception process of the standard radio wave is successful, the previous receiving station may be set. Here, the set standard radio wave is selected.

  Next, the standard radio wave reception control unit 646 performs second synchronization processing based on the TCO signal output from the binarization circuit 417 (S52). The standard radio wave reception control unit 646 establishes second synchronization by confirming whether the rising timing of the input TCO signal is 1 second interval.

If it is determined in S52 that the second synchronization has failed (NO in S52), the standard radio wave reception control unit 646 determines whether or not reception of all standard radio waves (receiving stations) has been completed (S53). ). If it is determined NO in S53, the standard radio wave reception control unit 646 returns to the selection of the receiving station in S51, selects another standard radio wave, and continues the process. The “all standard radio waves” determined in S53 are all standard radio waves that can be received by the electronic timepiece 1 (for example, when JJY40, JJY60, WWVB, DCF77, and MSF are set to be receivable). All standard radio waves) or only standard radio waves that can be received based on position information obtained at the time of positioning reception (for example, two stations of MSF and DCF 77 if the current position is London) may be used.
If the standard radio wave reception control unit 646 determines YES in S53, the standard radio wave reception control unit 646 terminates reception (S54) because it is not in a state where it can receive standard radio waves. Then, the display control unit 620 normally moves each hand (S55), and the standard radio wave reception control unit 646 ends the standard radio wave reception process S50.

  If the standard radio wave reception control unit 646 determines that the second synchronization is successful in S52, the standard radio wave reception control unit 646 acquires a marker indicating the 0-second position of the time code and performs frame synchronization (S56). For example, in JJY, a portion where P0 and M markers are continuous is the start time of the time code, and frame synchronization can be established by detecting this continuous marker.

When the frame synchronization is established by acquiring the marker, the standard radio wave reception control unit 646 decodes the TCO signal output from the binarization circuit 417 and acquires the time code (TC) (S57).
Next, the standard radio wave reception control unit 646 determines whether or not a predetermined time (for example, 5 minutes) has elapsed from the start of reception (S58). If YES is determined in S58, the standard radio wave reception control unit 646 terminates the reception because it is not in a state in which the standard radio wave can be received even if the reception process is continued further, and power is consumed wastefully. (S54). Then, the display control unit 620 normally moves each hand (S55), and the standard radio wave reception control unit 646 ends the standard radio wave reception process S50.

When it is determined “NO” in S58, the standard radio wave reception control unit 646 determines whether or not the time data match (S59). That is, the standard radio wave reception control unit 646 determines whether or not it is a check using a parity bit, a time at which time data does not exist, or the like.
When it is determined “YES” in S59, the standard radio wave reception control unit 646 determines whether or not the three frame data match (S60). The standard radio wave reception control unit 646 determines that the three frame data match when each time data obtained by acquiring three continuous time codes is at one minute intervals.

If the standard radio wave reception control unit 646 determines NO in S59 or S60, it returns to the time code acquisition process in S57.
If the standard radio wave reception control unit 646 determines YES in S60, the standard radio wave reception control unit 646 terminates the standard radio wave reception operation because an accurate TC has been acquired (S61).

Here, based on the acquired TC, the standard radio wave reception control unit 646 acquires necessity information indicating necessity of acquisition of leap seconds (S62).
When the type of the standard radio wave is JJY, WWVB, or DCF77, the standard radio wave reception control unit 646 acquires necessity information based on leap second update schedule information included in the acquired TC, and the obtained necessity information The acquisition time is associated with and stored in the standard radio leap second storage unit 670. That is, the standard radio wave reception control unit 646 acquires necessity information indicating that it is not necessary to acquire leap seconds when there is no leap second update schedule, and when there is a leap second update schedule, the standard radio wave reception control unit 646 acquires leap seconds. Necessary information indicating that it is necessary to acquire the information is acquired. More specifically, in the case of JJY, the necessity information indicating whether or not the leap second is necessary and the correction value are acquired and stored. In the case of WWVB and DCF77, the necessity information indicating whether or not the leap second is necessary is acquired. And memorize it. The acquisition time may not be stored in the standard radio leap second storage unit 670.

Further, when the type of the standard radio wave is MSF, difference information DUT1 indicating the difference between universal time (UT1) and coordinated universal time (UTC) is acquired from the acquired TC.
UTC is set so that the absolute value of DUT1 is 0.9 seconds or less. In order to maintain this setting, as shown in FIG. 16, when DUT1 becomes about −0.6 or less, 1 second tends to be inserted as leap seconds at the next leap second update candidate timing. In recent years, as shown in FIG. 16, January 1, 1999, January 1, 2006, January 1, 2009, July 1, 2012, July 1, 2015, 0:00 The leap second has been updated just before 0 seconds.
On the contrary, when DUT1 becomes about +0.6 or more, it is considered that 1 second is deleted (subtracted) as leap seconds.
For this reason, the standard radio wave reception control unit 646 can acquire the necessity information indicating whether to acquire leap seconds and the correction value based on the comparison result by comparing the difference information DUT1 with a preset difference threshold value. . Specifically, the standard radio wave reception control unit 646 needs to acquire leap seconds when the value of the difference information DUT1 is −0.6 or less, and indicates that the correction value is insertion of leap seconds. Necessity information to be shown can be acquired. Further, when the value of the difference information DUT1 is +0.6 or more, it is necessary to acquire leap seconds, and necessity information indicating that the correction value is deletion of leap seconds can be acquired. When the value of the difference information DUT1 is greater than −0.6 and less than +0.6, necessity information indicating that it is not necessary to obtain leap seconds can be obtained. The acquisition time may not be stored in the standard radio leap second storage unit 670.
Then, the standard radio wave reception control unit 646 stores the necessity information acquired in this way and the acquisition time in the standard radio leap second storage unit 670 in association with each other.
If the necessity information has already been acquired, the process of S62 does not have to be executed.

Thereafter, the time correction unit 610 corrects the time information of the internal time data 653 with the acquired time information of the TC, and corrects the time information of the reception time data 651 and the display time data 654 based on the time information (S63). . Then, the display control unit 620 returns each pointer to normal operation (S55). Then, the standard radio wave reception control unit 646 ends the standard radio wave reception process S50.
When the standard radio wave reception process S50 ends, the control unit 61 advances the process to S11 (FIG. 14) described later.

  As illustrated in FIG. 14, the reception mode selection unit 641 determines whether or not there is outdoor detection when it does not correspond to the standard radio wave scheduled reception time (when NO is determined in S4) (S6). Outdoor detection is determined by whether or not the solar cell 80 is irradiated with sunlight. That is, outdoor detection is performed using detection of the amount of power generated by the solar cell 80, and when strong light of approximately 10,000 lux or more is detected, it is determined that the electronic timepiece 1 is disposed outdoors. For this reason, the control unit 61 periodically controls the charging control circuit 71 to disconnect the charging path between the solar cell 80 and the secondary battery 130, and the voltage of the solar cell 80 is changed by the voltage detection circuit 74 in this state. If it is detected and the voltage is equal to or higher than a predetermined voltage, it is detected that the vehicle is outdoors.

If it is determined as “NO” in S6, the control unit 61 returns the process to S1.
When it is determined “YES” in S6, the reception mode selection unit 641 stores leap second update information (leap second update information whose leap second update date is later than the current time) in the satellite signal leap second storage unit 680. It is determined whether it is stored (S7). That is, it is determined whether leap second update information has already been received and acquired in the leap second update information acquisition period currently set by the leap second acquisition period setting unit 647.
If it is determined “YES” in S7, the updated leap second information has already been acquired. Therefore, even if the leap second update information is received again, only the same data is received, and this is a useless reception process. For this reason, the reception mode selection unit 641 selects the time measurement mode or the positioning mode without selecting the leap second mode. Here, the reception mode selection unit 641 normally selects the timekeeping mode, and selects the positioning mode only once after the release of the in-flight mode. Thereby, in S10, the time measurement reception control unit 643 or the positioning reception control unit 644 operates, and the time measurement reception process or the positioning reception process is executed.

When it is determined as “NO” in S7, since the leap second update information necessary for the satellite signal leap second storage unit 680 is not stored, the reception mode selection unit 641 determines the current time based on the internal time to be timed. It is determined whether the date and time is the leap second update information acquisition period set by the leap second acquisition period setting unit 647 (S8).
In this embodiment, as described above, when the standard radio wave set as the reception target is JJY, WWVB, or DCF77, the leap second update information acquisition period starts from the transmission start timing of the leap second update schedule information. Set to the period up to the update candidate timing in seconds. When the standard radio wave set as the reception target is MSF, the period is set from one month before the next update candidate timing to the update candidate timing.
If “NO” is determined in S8, the reception mode selection unit 641 selects the time measurement mode or the positioning mode without selecting the leap second mode at the present time, and advances the process to S10.

If the reception mode selection unit 641 determines “YES” in S8, the standard radio leap second storage unit 670 determines whether necessity information indicating that it is not necessary to acquire leap seconds is stored. (S9).
If “YES” is determined in S9, there is no leap second update schedule at the next leap second update candidate timing, so there is no need to receive leap second update information. For this reason, the reception mode selection unit 641 selects the time measurement mode or the positioning mode without selecting the leap second mode, and advances the processing to S10. That is, in this case, the leap second reception process S20 is not executed.

  If “NO” is determined in S9, that is, necessity information indicating that it is necessary to acquire leap seconds is stored in the standard radio leap second storage unit 670, or necessity information is stored. If not, it is necessary to obtain leap second update information. For this reason, the reception mode selection unit 641 selects the leap second mode. Thereby, the leap second reception control unit 645 is operated, and the leap second reception process S20 is executed.

[Leap second reception processing]
When the leap second reception process S20 is executed, as shown in FIG. 17, the leap second reception control unit 645 starts a satellite search (S21). Then, the leap second reception control unit 645 determines whether the satellite has been captured (S22). If the leap second reception control unit 645 determines “NO” because the satellite has not been captured in S22, has the elapsed time from the start of reception reached a predetermined timeout time (for example, 15 seconds) for capturing the satellite? It is determined whether or not (S23).

The leap second reception control unit 645 terminates reception when the time-out period elapses in S23 and time-out occurs (when it is determined YES in S23) (S24). Then, the leap second reception control unit 645 ends the leap second reception process S20.
On the other hand, if the time-out reception control unit 645 has not timed out in S23 (if NO is determined in S23), the satellite search process in S21 is continued.

If it is determined that the satellite has been captured in S22 (YES in S22), the leap second reception control unit 645 determines whether or not time information (Z count) has been acquired (S25). When a plurality of satellites can be captured, time information may be acquired from a satellite signal having a high signal strength (SNR), or time information may be acquired from each of the plurality of satellites, and time information consistency may be obtained. It may be confirmed that the acquisition of time information is successful.
If the leap second reception control unit 645 determines “NO” in S25, the leap second reception control unit 645 determines whether or not a predetermined timeout period (for example, 30 seconds) has elapsed (S26).

  The leap second reception control part 645 repeats the process of S25, when it determines with "NO" in S26. In the GPS satellite signal, since the Z count can be received at intervals of 6 seconds, if the timeout time of S26 is 30 seconds, the Z count can be received five times before the timeout occurs.

If the leap second reception control unit 645 times out in S26 (if determined YES in S26), the leap second reception control unit 645 ends the reception process (S24). Then, the leap second reception control unit 645 ends the leap second reception process S20.
On the other hand, if it is determined as “YES” in S25, the leap second reception control unit 645 executes leap second acquisition processing S40.

FIG. 18 is a flowchart showing the leap second acquisition process S40.
When the leap second reception control unit 645 executes the leap second acquisition process S40, the reception timing for receiving the leap second update information is calculated from the data at the time information reception process of S26. The leap second reception control unit 645 identifies the received page and subframe, so that page 12 of subframe 4 including leap second update information among all the data of 12 minutes 30 seconds transmitted from GPS satellite S. Broadcasting time (transmission timing) is calculated (S41). Then, the leap second reception control unit 645 stops the satellite signal reception process.

Next, the leap second reception control unit 645 determines whether or not the internal time has reached the reception timing calculated in S41 (S42). This process is repeated until “YES” is determined in S42.
When the leap second reception control unit 645 determines that it is the reception timing (when it is determined YES in S42), the leap second reception control unit 645 controls the satellite signal reception device 5 to perform reception processing and acquire leap second update information. Execute (S43).

  After performing the reception process in S43, the leap second reception control unit 645 determines whether leap second update information has been received (S44). The leap second reception control unit 645 attempts to receive up to three times by returning to S41 again when reception is not possible due to a shift in reception timing or a reception environment (S45). Here, the reception timing of the leap second update information is calculated again in S41. However, since the reception timing comes every 12 minutes 30 seconds, the reception timing can be calculated by adding 12 minutes 30 seconds to the previous timing. If the leap second update information cannot be received even after three retries (if YES is determined in S45), the leap second reception control unit 645 ends the leap second acquisition process S40.

  If it is determined that the leap second update information has been received in S44, the leap second reception control unit 645 stores the received leap second update information in the satellite signal leap second storage unit 680 (S46), and the leap second acquisition process. S40 ends.

  Returning to FIG. 17, when the leap second acquisition process S <b> 40 ends, the leap second reception control unit 645 ends the reception process in S <b> 27, and the time correction unit 610 performs reception time data 651, internal time based on the acquired time information. The data 653 and the display time data 654 are updated to correct the time information (S28). When the time correction unit 610 corrects the time information, the display control unit 620 corrects the display of the hands 21 to 25 via the drive circuit 62 based on the corrected time information. Then, the leap second reception control unit 645 ends the leap second reception process S20.

  Returning to FIG. 14, when the standard radio wave reception process S50, the time measurement reception process or the positioning reception process (S10), and the leap second reception process S20 are completed, the control unit 61 determines whether or not the time information has been successfully acquired. (S11). When it determines with "NO" in S11, the control part 61 returns to S1 and continues a process. On the other hand, when it is determined “YES” in S11, the control unit 61 ends the automatic reception process and waits until 0:00 of the next day.

[Manual reception processing procedure]
In the present embodiment, the standard radio wave reception process S50 and the leap second reception process S20 are only automatic reception processes. However, the satellite signal timing reception process and the positioning reception process are set so that they can also be performed manually by operating the A button 36. Has been. Since the specific reception process of the manual reception process is the same as the automatic reception process, description thereof is omitted. Note that the standard radio wave reception process S50 and the leap second reception process S20 may be manually executed by operating the operation member.

Through the above reception processing, the leap second update information can be stored in the satellite signal leap second storage unit 680.
When the leap second update information is stored in the satellite signal leap second storage unit 680, the time correction unit 610 has the internal time set to the leap second update date (usually 7/1 or 1/1). Sometimes, the leap second update data 652 is updated with the updated leap second information read from the satellite signal leap second storage unit 680. Thereby, the internal time is updated with the new leap second information. Then, the control unit 61 initializes the satellite signal leap second storage unit 680 and deletes the stored leap second update information.

Next, the execution timing of the leap second reception process S20 when JJY, WWVB, and MSF are set as the standard radio wave to be received will be described with reference to the example of FIG.
In this case, as shown in FIG. 19, the leap second update information acquisition period is a period from 00: 00: 00: 00 on June 1 to just before 0:00:00 on July 1 in UTC. It is set to the period from 0:00:00 on January 1 to immediately before 00: 00: 0 January 1.
Except for the leap second update information acquisition period, the leap second reception process S20 is not executed unless, for example, the leap second reception process S20 has not been executed for a long time or the current leap second information has not been acquired. In other words, the leap second reception process S20 that is executed periodically is prohibited outside the leap second update information acquisition period.
In the leap second update information acquisition period, first, leap second reception processing S20 is permitted. From this state, as shown in Example 1 in the figure, when the standard radio wave is received and the necessity information indicating that it is not necessary to acquire leap seconds is acquired, the next leap second update candidate timing is Since the seconds are not updated and it is not necessary to acquire leap second update information, the leap second reception process S20 is prohibited thereafter. On the other hand, as shown in Example 2 in the figure, when necessity information indicating that it is necessary to acquire leap seconds is acquired or when necessity information is not acquired, leap second reception processing S20 is permitted. Maintained. If it is determined that there is outdoor detection, leap second reception processing S20 is executed. If the leap second update information can be acquired, the leap second reception process S20 is prohibited thereafter.

Next, the execution timing of the leap second reception process S20 when the DCF 77 is set for the standard radio wave to be received will be described with reference to the example of FIG.
In the DCF 77, leap second update schedule information is transmitted from 23: 30: 00: 00 (UTC) on June 30 and December 31. In this embodiment, the standard radio time reception time is set to 2 o'clock local time (German time), that is, 1 o'clock UTC, so if the standard radio time reception time is not changed, the leap second update candidate Necessary information cannot be acquired by the timing. For this reason, in this embodiment, when the DCF 77 is set for the standard radio wave to be received, the standard radio wave scheduled reception is performed only on July 1st and January 1st in local time so that necessity information can be acquired. Change the time to a predetermined time included in the transmission period from the transmission start timing of the leap second update schedule information to the update candidate timing, for example, 0: 0: 0 (23:00:00 on the previous day in UTC) Yes.
When the DCF 77 is set, as shown in FIG. 20, the leap second update information acquisition period is from 23: 30: 00: 00 on June 30 to just before 00: 00: 00: 00 on July 1 in UTC. And a period from December 31, 23:00:00 to January 1, 00:00:00.
Outside the leap second update information acquisition period, the leap second reception process S20 that is periodically executed is prohibited.
In the leap second update information acquisition period, first, leap second reception processing S20 is permitted. From this state, as shown in Example 1 in the figure, when the standard radio wave is received and the necessity information indicating that it is not necessary to acquire leap seconds is acquired, the next leap second update candidate timing is Since the seconds are not updated and it is not necessary to acquire leap second update information, the leap second reception process S20 is prohibited thereafter. On the other hand, as shown in Example 2, when necessity information indicating that it is necessary to acquire leap seconds is acquired, or when necessity information is not acquired, the state in which leap second reception processing S20 is permitted is indicated. Maintained. Then, for example, when it is determined that there is outdoor detection by irradiating the electronic timepiece 1 with light having high illuminance, the leap second reception process S20 is executed. If the leap second update information can be acquired, the leap second reception process S20 is prohibited thereafter.

[Effects of First Embodiment]
The leap second reception control unit 645 does not execute the leap second reception process S20 in the leap second update information acquisition period when the necessity information indicating that it is not necessary to acquire the leap second is acquired. For this reason, it is possible to prevent the leap second reception process S20 from being executed when there is no leap second update schedule and there is no need to acquire leap second update information. The power consumption required for leap second reception of satellite signals is larger than the power consumption required for reception of standard radio waves. In the present embodiment, it is necessary to receive the standard radio wave, but it is possible to prevent the leap second reception of the satellite signal from being performed unnecessarily, so that power consumption can be reduced.

  When the standard radio waves to be received are JJY, WWVB, and DCF77, the necessity information can be easily acquired based on the standard radio waves. Further, even if the standard radio wave to be received is an MSF that does not include leap second update schedule information, necessity information can be obtained by calculation.

  When the standard radio wave to be received is DCF77, the standard radio wave reception control unit 646 acquires necessity information at a predetermined time included in the transmission period from the leap second update schedule information transmission start timing to the leap second update candidate timing. Execute the process. For this reason, even if the standard radio wave to be received is DCF77, necessity information can be acquired. According to this, for example, when necessity information indicating that it is necessary to acquire leap seconds is acquired, it is displayed to the user that leap second update information is displayed, for example, by displaying that there is a leap second update schedule. Can be promoted.

[Second Embodiment]
In the first embodiment, when the necessity information indicating that it is necessary to acquire leap seconds is acquired, the electronic timepiece 1 performs leap second reception processing S20. In contrast, when the necessity information indicating that it is necessary to acquire leap seconds is acquired, the electronic timepiece according to the second embodiment calculates and acquires updated leap second information based on the necessity information. By doing so, the leap second reception process S20 is not executed.
Hereinafter, among the configurations of the electronic timepiece according to the second embodiment, configurations different from the first embodiment will be mainly described.

The electronic timepiece of the second embodiment is configured to be able to receive JJY and MSF capable of acquiring necessity information indicating leap second acquisition necessity and correction value.
As shown in FIG. 21, the control unit 61 </ b> A of the electronic timepiece includes a leap second calculation acquisition unit 648.
The leap second calculation acquisition unit 648 calculates and acquires the updated leap second information based on the current leap second information and the correction value of the necessity information.
Specifically, when the necessity information is acquired, the leap second calculation acquisition unit 648 reads the current leap second information from the leap second update data 652, and the read current leap second information and the correction value of the necessity information. Based on the above, the updated leap second information is calculated and acquired. That is, when the correction value is insertion of leap seconds, the updated leap second information can be calculated by adding 1 second to the current leap second information (leap second integrated value). If the correction value is deletion of leap seconds, the updated leap second information can be calculated by subtracting 1 second from the current leap second information.
Then, when the leap second update date is reached, the time correction unit 610 updates the leap second update data 652 with the calculated leap second information, and corrects the internal time.
In the present embodiment, the satellite signal leap second storage unit 680 records the leap second update information stored in the past in association with the date and time when the leap second update information was acquired. The history information is also stored.

For this reason, the electronic timepiece according to the present embodiment does not execute the leap second reception process S20 even if there is a leap second update schedule when the necessity information can be acquired.
Specifically, the electronic timepiece of the present embodiment executes an automatic reception process shown in FIG.
Since the processes of S1 to S8, S10, S20, and S50 in the automatic reception process are the same as those in the first embodiment, description thereof is omitted.
In the automatic reception process, if “YES” is determined in S8, that is, if it corresponds to the acquisition period of the leap second update information, the reception mode selection unit 641 stores the necessity information in the standard radio leap second storage unit 670. It is determined whether it is stored (S12).
If it is determined “NO” in S12, the updated leap second information cannot be calculated and obtained, and thus leap second update information needs to be acquired. For this reason, the reception mode selection unit 641 sets the leap second mode. Thereby, leap second reception processing S20 is executed.

On the other hand, when it is determined as “YES” in S12, the reception mode selection unit 641 reads the history information from the satellite signal leap second storage unit 680, and is one before the current leap second update information acquisition period. It is determined whether or not leap second update information is acquired in the set leap second update information acquisition period (S13).
If “YES” is determined in S13, the current leap second information of the leap second update data 652 is the information included in the leap second update information and can be determined to be accurate. For this reason, based on the current leap second information and the correction value, it can be determined that the updated leap second information can be accurately obtained by calculation. Accordingly, since it is not necessary to receive leap second update information, the reception mode selection unit 641 selects the time measurement mode or the positioning mode without selecting the leap second mode, and advances the processing to S10.
On the other hand, if “NO” is determined in S13, it is determined that the leap second update information needs to be acquired, and the reception mode selection unit 641 sets the leap second mode. Thereby, leap second reception processing S20 is executed.

  For example, as shown in FIG. 23, JJY is set for the standard radio wave to be received, and the currently set leap second update information acquisition period is from June 1, 2016 to June 30, 2016 (July 1 A case will be described in which the leap second update information acquisition period set immediately before is the period from December 1, 2015 to December 31, 2015 (immediately before January 1). . In this case, according to this embodiment, when the leap second update information is received and acquired in the period from December 1, 2015 to December 31, 2015, the necessity information is obtained after June 1, 2016. At the time of acquisition, the leap second reception process S20 is prohibited, and the leap second reception process S20 is not executed in the leap second update information acquisition period from June 1, 2016 to June 30, 2016.

[Effects of Second Embodiment]
If leap second update information is acquired and necessity information is acquired in the leap second update information acquisition period set immediately before the currently set leap second update information acquisition period, leap second Since the calculation acquisition unit 648 calculates and acquires the updated leap second information, and the leap second reception control unit 645 does not execute the leap second reception process S20, power consumption can be reduced.
In addition, the same effect can be obtained by the same configuration as that of the first embodiment.

[Other Embodiments]
It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

In the second embodiment, the electronic timepiece acquires the leap second update information in the leap second update information acquisition period that is set immediately before the leap second update information acquisition period that is currently set. If the rejection information can be acquired, the leap second reception process S20 is not executed.
On the other hand, for example, even if leap second update information is not acquired in the previous leap second update information acquisition period, it is set before the currently set leap second update information acquisition period. In the leap second update information acquisition period, if leap second update information is acquired even once and all the necessity information after the update date of the last acquired leap second update information is acquired, The electronic timepiece may not execute the leap second reception process S20. This determination is realized by causing the standard radio leap second storage unit 670 to store history information recorded in association with necessity information stored in the past and the date and time when the necessity information was acquired. it can.
For example, as shown in FIG. 24, JJY is set for the standard radio wave to be received, and the currently set leap second update information acquisition period is from June 1, 2016 to June 30, 2016 (July 1 The last acquired leap second update information is acquired during the leap second update information acquisition period from December 1, 2014 to December 31, 2014 (immediately before January 1). The case will be described. In this case, if the necessity information is acquired for each period from June 1, 2015 to June 30, 2015, December 1, 2015 to December 31, 2015, after June 1, 2016. When the necessity information is acquired, the leap second reception process S20 is prohibited, and the leap second reception process S20 is not executed in the leap second update information acquisition period from June 1, 2016 to June 30, 2016.
That is, in this case, the leap second calculation acquisition unit 648 reflects the correction values of all the necessity information acquired afterwards in the updated leap second information acquired last, thereby updating the leap second after the update. Information can be acquired.
Therefore, in this case, the leap second calculation acquisition unit 648 calculates and acquires the updated leap second information, and the leap second reception control unit 645 does not execute the leap second reception process S20, thereby reducing power consumption.

Even when leap second update information has never been acquired in the past, when the necessity information is acquired, the electronic timepiece does not have to execute leap second reception processing S20.
That is, the current leap second information can also be obtained, for example, by the leap second calculation acquisition unit 648 calculating the difference between the GPS time received from the satellite signal and the time received from the standard radio wave.
For this reason, even if leap second update information has not been acquired in the past, if necessary / unnecessary information is acquired, the leap second calculation acquisition unit 648 obtains the current leap second obtained as described above. The updated leap second information can be acquired by reflecting the correction value of the necessity information in the information.
Therefore, regardless of whether leap second update information has been acquired in the past, if necessary / unnecessary information has been acquired, the leap second calculation acquisition unit 648 calculates and acquires the updated leap second information. Since the reception control unit 645 does not execute the leap second reception process S20, power consumption can be reduced.

  In the first embodiment, the electronic timepiece is configured to be able to receive JJY, WWVB, DCF77, and MSF, but the present invention is not limited to this. For example, only one of these standard radio waves may be received.

  In the second embodiment, the electronic timepiece is configured to receive JJY and MSF, but the present invention is not limited to this. For example, it may be configured to receive only the standard radio wave of JJY or MSF. Alternatively, the WWVB and DCF 77 may be configured to be receivable, and when the reception target standard radio wave is set to WWVB or DCF 77, the automatic reception process of the first embodiment may be applied.

In each of the above embodiments, the leap second acquisition period setting unit 647, when the standard radio wave to be received is set to JJY, WWVB, DCF77, the next leap second update candidate from the transmission start timing of the leap second update schedule information Although the period up to the timing is set to the leap second update information acquisition period, the present invention is not limited to this.
For example, the leap second acquisition period setting unit 647 may set a period after a predetermined period from the transmission start timing of the leap second update schedule information as the leap second update information acquisition period. For example, when the standard radio waves to be received are JJY and WWVB, the period from June 20 or June 25 to June 30 is set as the leap second update information acquisition period.
According to this, since the leap second reception process S20 is not executed during the predetermined period, the period from the transmission start timing of the leap second update schedule information to the next update candidate timing of the leap second is determined as the leap second update information acquisition period. Compared with the case where it sets to, before performing leap second reception process S20, possibility that necessity information will be acquired can be made high. For this reason, when it is not necessary to acquire leap second update information, it can suppress more reliably that leap second reception process S20 is performed.

  In each of the above embodiments, in the leap second reception process S20, the leap second reception control unit 645 calculates the acquisition timing of the leap second update information and stops the reception process until the internal time reaches the timing. The invention is not limited to this. For example, instead of calculating the acquisition timing of leap second update information, the reception process may be continued until the transmission timing of leap second update information comes.

  In each of the above embodiments, the update candidate timing of leap seconds is set to be immediately before 00: 00: 00: 00 on July 1 and January 1, but the update candidate timing is set to another day (for example, April 1). Or October 1st) immediately before 00: 00: 0.

  In each of the above embodiments, the electronic timepiece is configured to be able to display the local time and the home time, but the present invention is not limited to this. For example, the electronic timepiece may not display the home time. In this case, the first sub dial 12 and the hands 24 and 25 may not be provided.

  In each of the embodiments, the GPS satellite S has been described as an example of the position information satellite, but the present invention is not limited to this. For example, as the position information satellite, a satellite used in other global public navigation satellite systems (GNSS) such as Galileo (EU), GLONASS (Russia), and Beidou (China) can be applied. Further, a geostationary satellite such as a geostationary satellite type satellite navigation augmentation system (SBAS) or a satellite such as a regional satellite positioning system (RNSS) that can search only in a specific region such as a quasi-zenith satellite can be applied.

  The present invention can be widely used not only for electronic timepieces but also for electronic devices (for example, wrist-type devices and mobile phones) that receive standard radio waves and satellite signals.

  DESCRIPTION OF SYMBOLS 1 ... Electronic timepiece, 4 ... Standard radio wave receiver (2nd receiver), 5 ... Satellite signal receiver (1st receiver), 61, 61A ... Control part, 66 ... RTC (timer part), 610 ... Time correction , 620 ... Display control unit, 630 ... Voltage detection control unit, 640 ... Reception control unit, 641 ... Reception mode selection unit, 642 ... Satellite signal reception control unit, 643 ... Time measurement reception control unit, 644 ... Positioning reception control unit 645 ... leap second reception control unit, 646 ... standard radio wave reception control unit, 647 ... leap second acquisition period setting unit, 648 ... leap second calculation acquisition unit, A2, L1, LS1, LS2 ... leap second update schedule information, DUT1 ... Difference information.

Claims (8)

A first receiving device for receiving satellite signals;
A second receiving device for receiving a standard radio wave;
A timekeeping section for measuring the internal time,
A leap second acquisition period setting section for setting an acquisition period for acquiring leap second update information including leap second update date and leap second information after update;
A leap second reception control unit for controlling the first receiving device to receive the satellite signal and executing the process of acquiring the leap second update information;
When the internal time is the acquired leap second update date, a time correction unit that corrects the internal time based on the acquired leap second information after update,
A standard radio wave reception control unit that controls the second receiving device to receive the standard radio wave, and executes a process of acquiring necessity information indicating necessity of acquisition of leap seconds based on the received standard radio wave; Prepared,
The leap second reception control unit does not execute the process of acquiring the leap second update information in the acquisition period when the necessity information indicating that it is not necessary to acquire leap seconds is acquired. Electronic equipment. The electronic device according to claim 1,
The standard radio wave includes leap second update schedule information indicating whether there is a leap second update schedule,
The electronic apparatus according to claim 1, wherein the standard radio wave reception control unit acquires the necessity information based on the leap second update schedule information. The electronic device according to claim 2,
The electronic device, wherein the leap second acquisition period setting unit sets the acquisition period in a period after a predetermined period has elapsed from the transmission start timing of the leap second update schedule information. The electronic device according to claim 2 or claim 3,
When the transmission period from the transmission start timing of the leap second update schedule information to the update candidate timing at which the leap second is updated is less than 24 hours, the standard radio wave reception control unit, at a predetermined time included in the transmission period, An electronic device characterized by executing a process for acquiring necessity information. The electronic device according to claim 1,
The standard radio wave includes difference information indicating a difference between universal time (UT1) and coordinated universal time (UTC),
The standard radio wave reception control unit acquires the difference information from the standard radio wave, compares the acquired difference information with a preset difference threshold value, and acquires the necessity information based on a comparison result. Electronic equipment. A first receiving device for receiving satellite signals;
A second receiving device for receiving a standard radio wave;
A timekeeping section for measuring the internal time,
A leap second acquisition period setting section for setting an acquisition period for acquiring leap second update information including leap second update date and leap second information after update;
A leap second reception control unit for controlling the first receiving device to receive the satellite signal and executing the process of acquiring the leap second update information;
When the internal time is the acquired leap second update date, a time correction unit that corrects the internal time based on the acquired leap second information after update,
A standard radio wave reception control unit that controls the second receiving device to receive the standard radio wave, and executes processing for obtaining necessity information indicating leap second acquisition and correction values based on the received standard radio wave When,
A leap second calculation acquisition unit that calculates and acquires the updated leap second information based on the necessity information,
The leap second reception control unit, when the necessity information is acquired, does not execute the process of acquiring the leap second update information in the acquisition period. A first receiving device for receiving satellite signals;
A second receiving device for receiving a standard radio wave;
A timekeeping section for measuring the internal time,
A leap second acquisition period setting section for setting an acquisition period for acquiring leap second update information including leap second update date and leap second information after update;
A leap second reception control unit for controlling the first receiving device to receive the satellite signal and executing the process of acquiring the leap second update information;
When the internal time is the acquired leap second update date, a time correction unit that corrects the internal time based on the acquired leap second information after update,
A standard radio wave reception control unit that controls the second receiving device to receive the standard radio wave, and executes processing for obtaining necessity information indicating leap second acquisition and correction values based on the received standard radio wave When,
A leap second calculation acquisition unit that calculates and acquires the updated leap second information based on the necessity information,
The leap second reception control unit is configured to acquire the leap second update information and acquire the necessity information in the acquisition period set immediately before the currently set acquisition period. The electronic device is characterized by not executing the process of acquiring the leap second update information during the currently set acquisition period. The electronic device according to claim 7,
The leap second reception control unit acquires the leap second update information in the acquisition period set before the currently set acquisition period, and updates the leap second update information acquired last. The electronic device, wherein when all the necessity information after the date has been acquired, the process for acquiring the leap second update information is not executed in the currently set acquisition period.

Images