HK1177266B - Radio-controlled watch - Google Patents

Description

Radio-controlled timer

Technical Field

The present invention relates to a radio-controlled timepiece (radio-controlled timepiece) that performs time correction based on a signal received from a satellite.

Background

A radio-controlled timepiece is known which receives a radio wave including time information from an external time information supply source and corrects the time. As one of such radio-controlled timepieces, there has been studied a radio-controlled timepiece that corrects time using a signal received from a satellite such as a GPS (Global Positioning System) satellite (see, for example, patent documents 1 and 2).

Documents of the prior art

Patent document 1: japanese laid-open patent publication No. 2009-168620

Patent document 2: japanese patent laid-open No. 2008-145287

Disclosure of Invention

Problems to be solved by the invention

In the above radio-controlled timepiece, leap seconds may need to be corrected in order to obtain Time based on Coordinated Universal Time (UTC) from Time information included in a received signal. When the information on the leap second is included in the signal transmitted from the satellite, the time information is corrected in consideration of the fact that the radio-controlled timepiece receives the information on the leap second. However, in the case of a GPS satellite, for example, the information about leap seconds is not transmitted as frequently as the time information, and therefore, the state in which the information about leap seconds cannot be received may continue. Further, it is considered that the function of receiving leap second information different from time information cannot be installed due to a restriction of hardware or the like.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a radio-controlled timepiece capable of correcting leap seconds even when information on the leap seconds is not received from a satellite.

Means for solving the problems

A radio-controlled timepiece according to the present invention receives a signal including time information from a satellite to correct a time, and includes: a storage device that stores a leap second correction value for correcting the leap second of the time information; leap second display means for displaying a value corresponding to the leap second correction value stored in the storage means; an instruction receiving device that receives an instruction operation to change the leap second correction value from a user in a state where the leap second display device is displaying the leap second; and leap second correction value changing means for changing the leap second correction value stored in the storage means in accordance with the received instruction operation.

The storage device may further store information on the expiration date of the leap second correction value, the leap second correction value changing device may update the information on the expiration date when the leap second correction value is changed, and the radio-controlled timepiece may further include a determination result display device that determines whether or not the leap second correction value stored in the storage device is valid using the information on the expiration date and displays a determination result.

In the radio-controlled timepiece, the instruction receiving means may receive the instruction operation from the user in a state where the determination result display means displays that the leap second correction value stored in the storage means is not valid, and may restrict reception of the instruction operation in a state where the determination result display means displays that the leap second correction value stored in the storage means is valid.

The signal from the satellite may include information on the leap second correction value, the radio-controlled timepiece may further include a leap second information receiving device that receives the signal from the satellite including the information on the leap second correction value, the leap second correction value stored in the storage device may be changed in accordance with the received signal, and the leap second information receiving device may update the information on the effective period when the information on the leap second correction value is extracted.

In the radio-controlled timepiece, the leap second display device may display the value corresponding to the leap second correction value by a combination of the second hand and the minute hand.

In the radio-controlled timepiece, the instruction receiving means may receive an instruction operation to change the leap second correction value from a user and an input operation of information indicating an application time at which the changed leap second correction value is applied, and the leap second correction value changing means may change the leap second correction value stored in the storage means at a timing corresponding to the application time.

In the radio-controlled timepiece, the determination result display device may display the determination result and the expiration date when determining that the leap second correction value stored in the storage device is valid.

Effects of the invention

According to the radio-controlled timepiece of the present invention, leap second correction can be performed when no information about leap second is received from a satellite.

Drawings

Fig. 1 is a plan view showing an external appearance of a radio controlled timepiece according to a first embodiment of the present invention.

Fig. 2 is a block diagram showing an internal configuration of a radio-controlled timepiece according to a first embodiment of the present invention.

Fig. 3 is a schematic diagram showing a configuration of a satellite signal transmitted from a GPS satellite.

Fig. 4 is a functional block diagram showing functions of a radio-controlled timepiece according to the first embodiment of the present invention.

Fig. 5 is a state transition diagram of the radio-controlled timepiece according to the first embodiment of the present invention.

Fig. 6 is an explanatory diagram showing changes in the display state of the radio-controlled timepiece according to the first embodiment of the present invention when the leap second update process is executed.

Fig. 7 is a diagram showing an example of display of numerical values corresponding to the leap second correction value.

Fig. 8 is a state transition diagram of a radio-controlled timepiece according to a second embodiment of the present invention.

Fig. 9 is an explanatory diagram showing display contents when the leap second update process is executed by the radio-controlled timepiece according to the second embodiment of the present invention.

Fig. 10 is a diagram showing another example of the display of the numerical value corresponding to the leap second correction value.

Fig. 11 is a diagram showing another example of the display of the numerical value corresponding to the leap second correction value.

Fig. 12 is a diagram showing another example of the display of the numerical value corresponding to the leap second correction value.

Fig. 13 is a diagram showing an example of display of the effective period of the leap second correction value.

Fig. 14 is a diagram showing an example of display of information related to the leap second correction value.

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, a case where the radio-controlled timepiece according to the embodiment of the present invention is a wristwatch will be described as an example.

[ first embodiment ]

First, a radio timepiece according to a first embodiment of the present invention will be described. The radio-controlled timepiece 1 of the present embodiment receives a satellite signal including time information transmitted from a satellite, and corrects the time information using the received satellite signal. Fig. 1 is a plan view showing an external appearance of a radio-controlled timepiece 1 according to the present embodiment. Fig. 2 is a block diagram showing the internal configuration of the radio-controlled timepiece 1. As shown in the figure, the radio-controlled timepiece 1 includes an antenna 10, a receiver circuit 20, a control circuit 30, a power supply 40, a solar cell 41, a drive mechanism 50, a time display unit 51, and an operation unit 60.

The antenna 10 receives satellite signals transmitted from a satellite. In the present embodiment, the antenna 10 receives radio waves having a frequency of about 1.6GHz transmitted from a gps (global Positioning system) satellite. GPS is a type of satellite positioning system, and is implemented by a plurality of GPS satellites that surround the earth. Each of these GPS satellites is mounted with a high-precision atomic clock, and periodically transmits a satellite signal including time information measured by the atomic clock. Hereinafter, the time indicated by the time information included in the satellite signal is referred to as a GPS time.

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

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

The control circuit 30 is a microcomputer or the like, and includes an arithmetic section 31, a ROM (Read only Memory) 32, a RAM (Random Access Memory) 33, an RTC (Real Time Clock) 34, and a motor drive circuit 35.

The arithmetic unit 31 performs various information processes according to programs stored in the ROM 32. In the present embodiment, details of the processing executed by the arithmetic unit 31 will be described later. The RAM33 functions as a work memory of the arithmetic unit 31, and writes data to be processed by the arithmetic unit 31. In particular, in the present embodiment, bit strings (reception data) indicating the contents of satellite signals received by the reception circuit 20 are sequentially written into a buffer area in the RAM 33. The leap second correction value LS used to correct the time information is stored in the RAM 33. The RTC34 supplies a clock signal used for the time measurement in the radio wave timepiece 1. In the radio-controlled timepiece 1 of the present embodiment, the arithmetic section 31 corrects the internal time measured by the signal supplied from the RTC34 based on the satellite signal received by the receiving circuit 20, and determines the time (display time) to be displayed on the time display section 51. The motor drive circuit 35 outputs a drive signal for driving a motor included in the drive mechanism 50, which will be described later, based on the determined display timing. Thereby, the display time generated by the control circuit 30 is displayed on the time display unit 51.

The power supply 40 includes a power storage device such as a secondary battery, and stores the electric power generated by the solar cell 41. The stored electric power is supplied to the receiving circuit 20 and the control circuit 30. In particular, a switch 42 is provided in the middle of the power supply route from the power source 40 to the receiving circuit 20, and the on/off of the switch 42 is switched by a control signal output from the control circuit 30. That is, the control circuit 30 can control the operation timing of the receiving circuit 20 by switching the on/off of the switch 42. The receiver circuit 20 operates while power is supplied from the power supply 40 via the switch 42, and decodes the satellite signal received by the antenna 10.

The solar cell 41 is disposed below the dial 53, and generates electric power by external light such as sunlight irradiated from the radio-controlled timepiece 1, and supplies the generated electric power to the power supply 40.

The drive mechanism 50 includes a stepping motor that operates in accordance with a drive signal output from the motor drive circuit 35, and a gear Train (Train Wheel) that rotates the hands 52 by transmitting the rotation of the stepping motor. The time display unit 51 includes a pointer 52 and a dial 53. The hands 52 include an hour hand 52a, a minute hand 52b, and a second hand 52c, and the current time is displayed by rotating the hands 52 on a dial 53. As shown in fig. 1, the dial 53 displays not only a scale for displaying the time of day but also a mark for indicating to the user whether the leap second correction value LS described later is valid or invalid and whether the reception of the time information is successful. Examples of the display using these markers will be described later.

The operation unit 60 receives an operation of the user of the radio-controlled timepiece 1 and outputs the operation content to the control circuit 30. Specifically, as shown in fig. 1, the operation unit 60 of the present embodiment includes two operation buttons, i.e., a first operation button S1 and a second operation button S2, and a handle S3. The control circuit 30 executes processes such as updating of the leap second correction value LS and reception of satellite signals, which will be described later, based on the content of the operation input received by the operation unit 60. Thus, the user can perform an operation such as leap second correction on the radio-controlled timepiece 1 by operating the operation unit 60.

Here, a description will be given of a configuration of a satellite signal transmitted from a GPS satellite. Fig. 3 is a schematic diagram showing a configuration of a satellite signal (navigation data) transmitted from a GPS satellite. As shown in the figure, each GPS satellite repeatedly transmits navigation data with a total of 25 frames (pages) as 1 set. Each frame contains a 30 second signal and the GPS satellite transmits a full 25 frame signal in a 12.5 minute period. Each frame is composed of 5 subframes. 1 frame is 30 seconds, so 1 subframe is equivalent to a 6 second signal. In addition, 1 subframe is composed of 10 words, 1 word is 30 bits, and the entire 1 subframe includes 300 bits of information.

The first word of each subframe is called TLM (teletype word), and a Preamble (Preamble) indicating the start position of the subframe is included in the head (i.e., the head of the entire subframe). The second Word (second Word) of each subframe is called HOW (HandOver Word), and Time information called TOW (Time of week) is included in the head part thereof. The TOW is time information indicating the GPS time starting from the start of the week (0: 00 in the early morning of sunday). The radio-controlled timepiece 1 receives the TOW data from one or more GPS satellites, and can know the GPS time measured by the GPS satellites by combining the TOW data with the information of the week number WN. The week number WN is a number indicating the week to which the time shown by TOW belongs, and is given once per week, every morning on sunday 0: the count rises at 00 hours. The information of the week number WN is stored in the first subframe of each frame and transmitted from the GPS satellite.

The radio-controlled timepiece 1 receives TOW included in any one subframe, and can acquire time information transmitted from a GPS satellite. However, the GPS time indicating the time information is offset by an integer of seconds from the coordinated world time by leap seconds. Specifically, the GPS time is offset from the coordinated universal time by the leap second amount accumulated after the first transmission of the GPS satellite (1980). Therefore, the radio-controlled timepiece 1 needs to correct the GPS time obtained from the GPS satellite to a time based on the coordinated universal time using leap second information.

The information about leap seconds necessary for this correction is still periodically transmitted from the GPS satellite. Specifically, the leap second information is included in the fourth subframe of the 18 th frame in the satellite signal of all 25 frames transmitted from the GPS satellite. The second 5 words (i.e., from the first 151 th bit onward) of this subframe are information on the coordinated universal time, and the information on the coordinated universal time includes information on an integer value to be corrected with respect to the GPS time for leap second adjustment (hereinafter referred to as a leap second correction value LS). The leap second correction LS is contained in only 1 subframe of the full navigation data and is therefore transmitted from the GPS satellite every 12.5 minutes in a cycle. The radio-controlled timepiece 1 of the present embodiment corrects leap seconds by extracting the leap second correction value LS included in the satellite signal received from the GPS satellite, but instead of being able to receive the information on the leap second correction value LS from the GPS satellite, it has a function that allows the user to manually change the leap second correction value LS.

In addition, the sub-frame including the leap second correction value LS includes information on the scheduled date and time for the next leap second adjustment (leap second adjustment notice information) together with the leap second correction value LS. This information is updated when the next leap second adjustment is determined to be performed by the scheduled day, and is information indicating the date and time when the previous leap second adjustment was performed during the period when the next leap second adjustment is not determined. As long as the leap second adjustment notice information shows the future date and time, the leap second correction value LS is not changed until the date and time comes.

A specific example of the processing performed by the arithmetic unit 31 of the control circuit 30 in the present embodiment will be described below. The computing unit 31 executes the program stored in the ROM32, thereby realizing the functions of the satellite signal receiving unit 31a, the leap second information managing unit 31b, and the time correcting unit 31c, as shown in fig. 4.

The satellite signal receiving unit 31a receives a satellite signal transmitted from a GPS satellite, and thereby acquires TOW and week number WN included therein. The satellite signal receiving unit 31a may periodically execute such a process of acquiring time information, or may execute such a process in response to an instruction operation of the user to the operation unit 60. In the present embodiment, the satellite signal reception unit 31a attempts reception of a subframe including the leap second correction value LS at a predetermined timing. When the reception is successful, the leap second correction value LS is extracted from the received data and stored in the RAM 33.

The leap second information management unit 31b manages the leap second correction value LS stored in the RAM 33. Specifically, the RAM33 stores the information on the leap second correction value LS and the information (leap second valid period information) on the valid period of the leap second correction value LS, and the leap second information management unit 31b uses this information to determine whether the leap second correction value LS stored in the RAM33 is valid (i.e., whether the valid period of the leap second correction value LS has expired). When determining that the valid period of the leap second correction value LS has expired, the leap second information management unit 31b manually performs the process of updating the leap second correction value LS in response to an instruction from the user. That is, when the valid period of the leap second correction value LS stored in the RAM33 expires, the leap second information management unit 31b displays and updates the leap second correction value LS stored in the RAM33 in response to an instruction operation to the operation unit 60. A specific example of the leap second correction value LS update process executed by the leap second information managing unit 31b will be described later.

The time correction unit 31c corrects the internal time measured inside the radio-controlled timepiece 1 using the GPS time information received from the GPS satellites by the satellite signal receiving unit 31a and the leap second correction value LS stored in the RAM 33. Specifically, the time correction unit 31c first adds the leap second correction value LS to the GPS time to calculate the time information based on the coordinated universal time. Then, the internal time measured in the control circuit 30 is corrected so as to match the time of the coordinated universal time. The internal time information of the radio-controlled timepiece 1 to be corrected by the time correcting unit 31c is stored in the RAM33 and is updated based on the clock signal supplied from the RTC 34. Here, the time correction unit 31c may perform time correction using the leap second correction value LS when the valid period of the leap second correction value LS has expired. Even if the expiration date set in the radio-controlled timepiece 1 expires, the time based on the coordinated universal time can be calculated using the leap second correction value LS stored in the RAM33 unless a new leap second adjustment is actually performed.

The effective period of the leap second correction value LS managed by the leap second information managing unit 31b will be described below. The leap second adjustment for the coordinated universal time is performed on the final day of each month of the coordinated universal time. Therefore, for example, when the leap second correction value LS is manually updated, the leap second information management unit 31b determines that the leap second correction value LS currently stored is valid at least by the last date of the month on which the update was performed. The leap second adjustment is performed preferentially on the final day of 6 months and the final day of 12 months, and cannot be performed except for these days. Therefore, the leap second information management unit 31b may determine that the leap second correction value LS is valid until the next 6-month final date or 12-month final date after the leap second correction value LS is updated. Further, the leap second correction value LS may be determined to be valid after the leap second correction value LS is updated until a predetermined period of time elapses, or may be determined to be valid until a predetermined date and time comes.

Specifically, for example, when the leap second correction value LS is manually updated, the leap second information management unit 31b updates the leap second valid flag to a value indicating "valid" and updates information indicating how much the updated leap second correction value LS is valid for the month (information on the valid period and month). In this example, the leap second valid flag and the information of the valid period month are used as the leap second valid period information. For example, when the leap second correction value LS is updated in 2 months in 2010, the leap second information managing unit 31b sets 6 months in 2010, which is the month that the last date arrived after the update date, of 6 months and 12 months, as the valid period month. Then, when 1 day per month arrives, the leap second information management unit 31b compares the information on the expiration date month with the information on the internal time based on the coordinated universal time held in the RAM33, and determines whether or not the expiration date month has elapsed. In the above example, the leap second correction value LS is determined to have expired when 7/1/2010 of the coordinated world arrives. In this case, the leap second information management unit 31b switches the value indicating "valid" of the leap second valid flag to the value indicating "invalid". The leap second information management unit 31b determines whether the leap second correction value LS stored at the current time is valid by referring to the value of the leap second valid flag.

In this example, when the leap second correction value LS is received from the GPS satellite by the satellite signal receiving unit 31a, the leap second information managing unit 31b may update the information on the valid period and the month by referring to the leap second correction value LS and the leap second adjustment notice information transmitted from the GPS satellite. That is, as long as the leap second adjustment notice information indicates the future date and time, the month corresponding to the day is set as the valid period month. Accordingly, the leap second information management unit 31b can determine whether or not the leap second correction value LS currently stored is valid by referring to the information on the valid period month regardless of whether or not the reception of the leap second correction value LS in the past has succeeded. In this case, when the leap second adjustment notice information indicates the past date and time (that is, when the next leap second adjustment execution timing is unknown), the leap second information management unit 31b may update the valid period information in the same rule as the case where the leap second correction value LS is manually updated.

As another example of the method for managing the leap second valid period, when the leap second correction value LS is set to the value that the last date of a manually updated month has expired, the leap second information managing unit 31b does not need to hold the information of the valid period month. In this case, the leap second information management unit 31b manages the valid period using only the leap second valid flag as the leap second valid period information. That is, when the leap second correction value LS is manually updated, the leap second valid flag is set to "valid", and when 1 day per month comes, the leap second valid flag is changed to "invalid". Thus, the leap second correction value LS updated in the previous month can be invalidated at the beginning of each month.

In this example, the leap second information management unit 31b may change the effective period of the clock signal in response to whether the last leap second correction value LS is updated manually or by receiving a satellite signal. Specifically, the leap second information management unit 31b further stores flag information indicating whether or not the update of the leap second correction value LS was manually performed in the RAM33, and when it is determined that the previous update was manually performed by the flag information 1 day per month, changes the leap second valid flag to "invalid". On the other hand, when it is determined that the previous update was not performed manually but by reception of the satellite signal, the leap second valid flag is updated based on the leap second adjustment notice information received together with the leap second correction value LS, for example, as in the above example.

As another example of the method for managing the leap second valid period, the leap second information managing unit 31b may manage the valid period of the leap second correction value LS using a count value indicating that the leap second correction value LS is valid for any period later as the valid period information. The count value is information indicating the remaining period in which the leap second correction value LS is valid in a predetermined time unit such as a time unit, a day unit, and a month unit. For example, when the valid period of the leap second correction value LS is managed using the count value in units of time, the leap second information managing unit 31b initializes the count value with a predetermined value when manually updating the leap second correction value LS. For example, when the valid period of the leap second correction value LS is set to 30 days, the count value is set to 720 (═ 30 × 24). After that, every 1 hour passes, the leap second information management unit 31b updates the count value to a value minus 1. As a result, the count value gradually decreased with time, and finally became 0 after 720 hours. After the count value becomes 0, the leap second information management unit 31b does not perform the process of subtracting the count value from the leap second information. When the count value becomes 0, the leap second correction value LS is determined to be invalid. In this example, the leap second information management unit 31b may change the leap second valid flag to "invalid" at the time when the count value becomes 0, or may determine whether the leap second correction value LS is valid by whether or not the count value is 0 without using the leap second valid flag. In this case, when the leap second correction value LS is updated by reception of the satellite signal, the time until the next leap second adjustment is performed may be calculated based on the leap second adjustment notice information received together with the leap second correction value LS, and the count value may be set based on the calculated value.

Next, an example of the procedure of the operation of the radio-controlled timepiece 1 to update the leap second correction value LS will be described with reference to fig. 5 and 6. Fig. 5 is a state transition diagram of the radio-controlled timepiece 1 when the leap second information update process is performed, and fig. 6 is an explanatory diagram showing a change in the display state on the dial 53.

First, as shown in fig. 6 (a), in a normal time display state M1 in which the current date and time is displayed by the pointer 52, the user performs an operation of pressing the first operation button S1. Then, the radio-controlled timepiece 1 transitions to the leap second valid display state M2, and displays whether or not the leap second correction value LS currently held is valid. Specifically, when the leap second correction value LS is determined to be valid by the above processing, the second hand 52c moves to the "LS-OK" position indicating the position between the 11-point direction and the 12-point direction and stops as shown in fig. 6 (b). On the other hand, when the leap second information management unit 31b determines that the leap second correction value LS is not valid, the second hand 52c moves to a position indicating "LS-NG" between the 10 o 'clock direction and the 11 o' clock direction and stops as shown in fig. 6 (c).

In leap second valid display state M2, when the user presses the first operation button S1 again, the radio-controlled timepiece 1 returns to time display state M1, and returns the second hand 52c to the position corresponding to the current time. When the leap second correction value LS is valid, the user only needs to press the first operation button S1 to return the radio-controlled timepiece 1 to the time display state M1 because the leap second correction value LS does not need to be updated. After the transition to leap second valid display state M2, radio-controlled timepiece 1 automatically returns to time display state M1 without any operation by the user for the entire predetermined time. On the other hand, when the valid period of the leap second correction value LS has expired, the user presses the second operation button S2 to select whether to perform reception of leap second information with respect to the radio-controlled timepiece 1 or to manually update the leap second information by pulling out the table S3.

In leap second valid display state M2, when the user presses the second operation button S2, the radio-controlled watch 1 transits to leap second received state M3. In this state, the satellite signal reception unit 31a attempts reception of a satellite signal including the leap second correction value LS transmitted from the GPS satellite. At this time, as shown in fig. 6 (d), the radio-controlled timepiece 1 moves the second hand 52c to the position of the "RX" mark indicating the 12 o' clock direction in order to notify the user that the reception process is in progress.

After that, after the leap second correction value LS is successfully received, the leap second correction value LS received by the leap second information management unit 31b is stored in the RAM33, the effective period of the leap second correction value LS is set again, and the time is corrected using the leap second correction value LS newly received by the time correction unit 31 c. Then, the radio-controlled timepiece 1 moves the second hand 52c to the position indicating "LS-OK" and temporarily stops it, as shown in fig. 6 (e), in order to indicate to the user that the leap second correction value LS has been received successfully. After that, the radio-controlled timepiece 1 automatically (without user operation) returns to the time display state M1 shown in fig. 6 (f).

On the other hand, if the leap second correction value LS is not received, the radio-controlled timepiece 1 returns to the time display state M1 without updating the leap second correction value LS. Although the state M1 is returned immediately after the leap second correction value LS is received in failure in fig. 6, the second hand 52c may be moved to the "LS-NG" position once and then returned to the time display state M1 to indicate that the leap second correction value LS is received in failure, as in the case where the leap second correction value LS is received in failure. Alternatively, the radio-controlled timepiece 1 may return to the leap second valid display state M2 shown in fig. 6 (c) so as not to return to the time display state M1 when the leap second correction value LS is not received, and so as to display the expiration date of the leap second correction value LS.

When the user pulls the watch out of S3 in leap second valid display state M2, radio-controlled timepiece 1 transits to leap second manual correction state M4. In this state, as shown in fig. 6 (g), the leap second information managing unit 31b displays the value corresponding to the leap second correction value LS stored in the RAM33 on the time display unit 51. In the example of fig. 6 (g), the leap second correction value LS is displayed by moving the hour hand 52a to a position corresponding to the leap second correction value LS. In this case, the second hand 52c indicates the 11-point direction between "LS-OK" and "LS-NG" to indicate that the leap second manual correction state M4 is present. When the user rotates the handle S3 in this state, the leap second information managing unit 31b rotates the hour hand 52a according to the rotation direction and the rotation amount. At this time, the user refers to the current leap second information disclosed on the internet, for example, the home page, and moves the hour hand 52a to the position corresponding to the leap second. Finally, when the user pushes the table and returns S3 to the normal position, the leap second information management unit 31b determines that the leap second correction value LS by the user has been corrected, and updates the leap second correction value LS to a value corresponding to the position of the hour hand 52a at that time. After that, the radio-controlled timepiece 1 automatically returns to the time display state M1 via the display of fig. 6 (e) in the leap second reception state M3, similarly to the case where the leap second reception was successful.

Here, the display method shown in fig. 6 (g) is merely an example, and the leap second information managing unit 31b may display the value corresponding to the leap second correction value LS by another method. For example, in fig. 6 (g), the numerical value is displayed by the position of the hour hand 52a, but the numerical value may be displayed by the position of the minute hand 52 b. In the above example, the operating state of the radio-controlled timepiece 1 is indicated by the second hand 52c indicating the flags such as "LS-OK", "LS-NG", and "RX", but when these states are displayed by a dedicated hand, for example, the numerical value corresponding to the leap second correction value LS may be displayed by using the second hand 52 c. The leap second information management unit 31b may display the value corresponding to the leap second correction value LS by a combination of 2 or more of the hour hand 52a, minute hand 52b, and second hand 52 c. In this case, for example, the leap second information management unit 31b displays numerical values by performing control so that the plurality of hands 52 (for example, the hour hand 52a and the minute hand 52 b) overlap each other and indicate the same position. Therefore, it is possible to clearly indicate to the user that the numerical value corresponding to the leap second correction value LS is displayed without displaying the normal time.

In the leap second manual correction state M4, the leap second information management unit 31b may display the value of the leap second correction value LS as it is, but may display the value corresponding to the leap second correction value LS by adding or subtracting a predetermined value to or from the value. As described above, the GPS time information received by the radio-controlled timepiece 1 of the present embodiment corresponds to the coordinated universal time offset corresponding to leap seconds accumulated after 1 month and 1 day in 1980. At 1/1 of the 1980 s, there was a 19 second deviation between international atomic time and coordinated world time. Therefore, there is always a difference of 19 seconds between the GPS time and the international atomic time, and the leap second correction value LS for matching the GPS time with the coordinated world time phase is also set to a value 19 seconds smaller than the correction value for matching the international atomic time with the coordinated world time phase. Then, the leap second information management unit 31b may display the leap second correction value LS added by 19 seconds on the time display unit 51. Specifically, in the example of fig. 6 (g), when the leap second correction value LS is 15 seconds, the hour hand 52a indicates a position corresponding to a value "34" obtained by adding 19 seconds to the leap second correction value LS. In this state, when the user rotates the watch at S3 to move the hour hand 52a, the leap second correction value LS is updated by subtracting 19 from the value indicated by the hour hand 52 a. Accordingly, the user can update the leap second correction value LS to a value that can accurately correct the GPS time to the coordinated universal time by changing the value displayed on the time display unit 51 to a value that is generally indicated as the deviation between the international atomic time and the coordinated universal time (the accumulated value of leap seconds) without being aware of the international atomic time deviation from the GPS time.

Alternatively, the leap second information management unit 31b may display the leap second correction value LS as a relative value to the initial value (for example, the leap second correction value LS stored in the ROM32 when the radio-controlled timepiece 1 is shipped). Fig. 7 shows a display example of the numerical value corresponding to the leap second correction value LS in this example. In fig. 7, the initial value of the leap second correction value LS is 15 seconds, and as in the case of fig. 6 (g), a value obtained by adding 19 seconds (34 seconds) to the initial value is shown as an example of the reference value for leap second adjustment. The broken line in fig. 7 indicates the display position of the reference value (hereinafter referred to as reference position R). The numerical values around the dial 53 indicate display positions of numerical values for + 10 seconds, + 20 seconds, + …, and 50 seconds, respectively. However, in this example, the dial 53 does not necessarily display the actual reference position R and the relative value to the reference value. In the example of fig. 7, the leap second correction value LS indicates the same position as in the case of fig. 6 (g) for the hour hand 52a between 15 seconds and 40 seconds (i.e., the display value on the dial 53 is 34 seconds to 59 seconds). In the case of fig. 6 (g), the absolute value is displayed, and therefore, a value of 60 seconds or more cannot be displayed, but in fig. 7, since the numerical value is displayed by the relative position with the position of 34 seconds as the reference position R, the user can set the numerical value of 74 seconds (up to 93 seconds as the displayed value on the dial 53) as the leap second correction value LS by operating the table at S3. The value of 93 seconds is a value corresponding to + 59 seconds as a relative value to the reference value of 34 seconds. In the example of fig. 7, the hour hand 52a indicates the direction of point 1, which indicates that the display value is 65 seconds (+ 31 seconds with respect to the reference value of 34 seconds). According to the standard, both leap second addition and deletion can be performed in leap second adjustment, but in actual operation, leap second deletion cannot be performed, and the leap second cumulative value continues to increase. Therefore, for example, it is not preferable to set the leap second correction value LS to the initial value of the leap second correction value LS by using a value corresponding to the leap second accumulated value at the time of shipment of the radio-controlled timepiece 1 as the relative positive value. Note that setting the reference position R to 34 seconds is merely an example. For example, if the leap second correction value LS at the time of shipment is 26 seconds, and a position of 45 seconds (9-point direction) to which 19 seconds are added as a deviation is set as the reference position R, the displayable numerical value range is 45 seconds to 104 seconds, and accordingly, the leap second correction value LS can be set in a range of 26 seconds to 85 seconds. In short, the leap second accumulated value is displayed and set as a relative value to the reference value, and thus the leap second accumulated value is increased from the reference value by 59 seconds at maximum (that is, the number of seconds corresponding to 1 week on the dial 53), and the leap second correction value LS can be manually updated.

In the state transition diagram of fig. 5, when the leap second valid display state M2 is operated and the second operation button S2 or the knob S3 is operated, the state transitions to the leap second received state M3 or the leap second manual correction state M4. However, the leap second information management unit 31b may restrict such state transition based on the result of the determination as to whether the leap second correction value LS is valid. That is, when the leap second information management unit 31b determines that the valid period of the leap second correction value LS has expired, the leap second valid display state M2 transits to the leap second reception state M3 or the leap second manual correction state M4 only when the result of the display is displayed, and when it is determined that the valid period of the leap second correction value LS has not expired, the transition is restricted. Accordingly, when the leap second correction value LS is valid, the user can not update the leap second correction value LS unnecessarily.

Although not shown in fig. 5 and 6, the radio-controlled timepiece 1 may display the reception TOW data or the reception week number WN by the user's instruction operation. In addition, when the TOW and week number WN data are not received, the reception of these data may be attempted by a user instruction operation, or the time and calendar may be corrected manually.

Here, control in the case of restarting the system of the radio-controlled timepiece 1 will be described. For example, when the power supply voltage of the power supply 40 is low and the operation is difficult to continue, the information in the RAM33 may be stored in the nonvolatile memory before the system shutdown of the radio-controlled timepiece 1 occurs, and the process of normally terminating the control circuit 30 may be executed. In addition, a system reset of the control circuit 30 may be performed. After the execution of this processing, when the control circuit 30 is restarted, the computing unit 31 obtains leap second information again as a part of the starting processing. Specifically, as shown in the state transition diagram of fig. 5, when the radio-controlled timepiece 1 returns from the system reset state M5, the state of S3 is changed to either the leap second received state M3 or the leap second manual correction state M4 based on the table of the time points. That is, if the table is in the normal position (when the table is in the off state of S3) without pulling out S3, the table transitions to the leap second reception state M3 and attempts to receive the leap second information. On the other hand, when the watch knob S3 is pulled out (when the watch knob S3 is in the operating state), the state transitions to the leap second manual correction state M4, and the leap second correction value LS is updated in accordance with the user' S operation of the watch knob S3. When the radio-controlled timepiece 1 is restarted, there is a high possibility that the effective period of the leap second correction value LS will expire when the radio-controlled timepiece 1 is stopped for a long time. By performing such an update process at the time of restart, the radio-controlled timepiece 1 can acquire the latest leap second correction value LS. In addition, when such restart processing is executed, TOW and week number WN data also need to be retrieved. The reception process of receiving the information from the GPS satellite may be performed before the leap second correction value LS is received and manually updated, or may be performed after the leap second correction value LS is received and manually updated.

The radio-controlled timepiece 1 may also be configured to transition to the leap second reception state M3 or the leap second manual correction state M4 when the time is determined to have expired by referring to the leap second valid period information at the last system end without immediately transitioning to the leap second reception state M3 or the leap second manual correction state M4 at the time of restart and determining whether the valid period of the leap second correction value LS has expired. In this case, the radio-controlled timepiece 1 first receives TOW and week number WN data after restarting and acquires information on the current date and time. Then, the current date and time information and the leap second valid period information are referred to, and whether or not the valid period of the leap second correction value LS has expired is determined. If the effective period of the leap second correction value LS has not expired, the radio timer 1 transitions to the time display state M1 and starts the normal time display.

According to the radio-controlled timepiece 1 of the present embodiment described above, the leap seconds can be manually set, and therefore, even when the leap seconds are not successfully received, the leap second information can be acquired and applied to the correction of the time information received from the satellite signal. As described above, the leap second information is transmitted from the GPS satellite at a lower frequency than TOW or the like, and the reception opportunity is limited. In particular, in a portable timepiece such as a wristwatch, a stable and good reception environment may not be ensured, and leap second information may not be received for a long time. In this case, in the radio-controlled timepiece 1 of the present embodiment, the user can manually set leap seconds as an alternative. Further, when setting of leap seconds by the user is accepted, the valid period is set for the leap second information, and when the valid period expires, the result is displayed to the user.

[ second embodiment ]

Next, a radio timepiece according to a second embodiment of the present invention will be described. The internal processing of the radio-controlled timepiece of the present embodiment is different from that of the radio-controlled timepiece of the first embodiment, but the hardware configuration and the functional configuration may be the same as those of the first embodiment. Therefore, the same reference numerals are used to refer to the same components as those of the first embodiment, and detailed description thereof will be omitted.

In the present embodiment, the satellite signal reception unit 31a acquires the information of TOW and the week number WN included in the satellite signal, but does not receive the information of the leap second correction value LS. The initial value of the leap second correction value LS at the time of shipment is stored in the ROM32, and the leap second information management unit 31b first reads the initial value and stores it in the RAM 33. The leap second correction value LS stored in the RAM33 is manually updated and changed by the user as in the case of the first embodiment. The time correction unit 31c corrects the GPS time obtained from TOW to the time based on the coordinated universal time using the leap second correction value LS stored in the RAM 33.

Here, in the present embodiment, an example of the procedure of the operation when the radio-controlled timepiece 1 updates the leap second correction value LS will be described with reference to fig. 8 and 9. Fig. 8 is a state transition diagram of the radio-controlled timepiece 1 when the leap second information update process is performed as in fig. 5, and fig. 9 is an explanatory diagram showing a change in the display state on the dial 53 as in fig. 6.

First, as shown in fig. 9 (a), in a normal time display state M1 in which the current date and time is displayed by the pointer 52, the user performs an operation of pressing the first operation button S1. Then, the radio-controlled timepiece 1 transitions to the leap second valid display state M2, and displays whether or not the leap second correction value LS currently held is valid. Specifically, when the leap second correction value LS is valid, the second hand 52c moves to a position indicating "LS-OK" as shown in fig. 9 (b), and when the valid period expires, the second hand 52c moves to a position indicating "LS-NG" as shown in fig. 9 (c).

In the leap second valid display state M2, when the user presses the first operation button S1 or when a predetermined time has elapsed without any operation by the user, the radio timer 1 returns to the time display state M1, as in the first embodiment. On the other hand, when the valid period of the leap second correction value LS has expired, the user manually updates the leap second information by pulling out the table handle S3. Since the radio-controlled timepiece 1 of the present embodiment does not support reception of leap second information, the second operation button S2 cannot transit to the leap second received state M3 unlike the case of the first embodiment.

When the user operates the pull-out handle S3 in leap second valid display state M2, the radio-controlled timepiece 1 transits to leap second manual correction state M4. In this state, as shown in fig. 9 (d), the leap second information management unit 31b moves the hour hand 52a to the position corresponding to the leap second correction value LS, thereby displaying the value corresponding to the leap second correction value LS stored in the RAM 33. At the same time, the second hand 52c moves to a position indicating the middle position (11-point direction) of "LS-OK" and "LS-NG". In this state, when the user rotates the watch handle S3, the leap second information managing unit 31b rotates the hour hand 52a according to the rotation direction and the rotation amount. Finally, when the user pushes the table and returns to the normal position at S3, the leap second information management unit 31b determines that the user has finished correcting the leap second correction value LS, and updates the leap second correction value LS to a value corresponding to the position of the hour hand 52a at that time. In fig. 9, unlike the first embodiment, after the manual update of the leap second correction value LS is completed, the second hand 52c does not display the "LS-OK" position, and the radio-controlled timepiece 1 automatically returns to the time display state M1 shown in fig. 9 (a). However, similarly to the first embodiment, the time-to-moment display state M1 may be restored via the display shown in fig. 6 (e).

In addition, similarly to the first embodiment, the radio-controlled timepiece 1 of the present embodiment may shift the state of S3 to the leap second manual correction state M4 based on the table of the return time when returning from the system reset state M5. In this case, as shown in the state transition diagram of fig. 8, when the watch handle S3 is pulled out, the radio-controlled timepiece 1 transitions to the leap second manual correction state M4 when returning from the system reset state M5. On the other hand, when the watch is in the normal state at S3, unlike the first embodiment, the leap second information reception process is not executed in the present embodiment, and therefore the radio-controlled timepiece 1 transitions to the time display state M1. In both cases, the radio-controlled timepiece 1 needs to receive TOW and week number WN data from GPS satellites at the time of restart, as in the first embodiment. In particular, when pulling out the watch knob S3 and making a transition to the leap-second manual correction state M4, it is preferable that the radio-controlled timepiece 1 does not receive the TOW and the week number WN before making a transition to the leap-second manual correction state M4, and after the manual correction of leap seconds is completed and the user returns the watch knob S3 to the normal state, the reception of these data is executed. This is because, when the reception process is performed before the transition to the leap second manual correction state M4, the leap second manual correction cannot be performed during the reception process, and the user waits for the leap second manual correction to be performed.

According to the radio-controlled timepiece 1 of the present embodiment described above, since the leap second reception process is not performed, it is not necessary to notify the user of a failure in leap second reception, and the user can easily and clearly operate the radio-controlled timepiece. In addition, power consumption due to leap second reception processing can be avoided. On the other hand, although the leap second reception function is not provided, by receiving manual leap second setting, when the leap second is adjusted, the time can be displayed based on the coordinated universal time in which the content is reflected. In addition, since the leap second adjustment is not performed frequently in reality, the user can complete the leap second adjustment without much trouble even if the user manually performs the leap second adjustment.

[ modified examples ]

The embodiments of the present invention are not limited to the above description. For example, although the radio-controlled timepiece 1 is a wristwatch in the above description, it may be any of various timepieces that receive a signal including time information from a satellite and correct the time. In the above description, at least a part of the processing executed by the arithmetic unit 31 of the control circuit 30 may be realized by an arithmetic circuit such as an independent logic circuit.

The display of whether the effective period of the leap second correction value LS of the radio-controlled timepiece 1 of the above embodiment has expired and the display of the numerical value corresponding to the leap second correction value LS are exemplified, and the radio-controlled timepiece of the embodiment of the invention can display these information in various other display modes. For example, when the valid period of the leap second correction value LS is expired, the radio-controlled timepiece 1 may display the expiration of the valid period to the user by a method such as performing a 2-second hand. In addition, when leap second update processing is performed, the instruction operation by the user may be performed in various orders other than the order described above.

Next, another example of display in the case where the radio-controlled timepiece 1 according to the embodiment of the invention displays the value corresponding to the leap second correction value LS in the leap second manual correction state M4 will be described. Hereinafter, the value to be displayed and adjusted by the user in the leap second manual correction state M4 will be referred to as an adjustment target value. The adjustment target value may be the leap second correction value LS itself as described above, or may be a value obtained by adding a predetermined value (a value indicating a difference between the GPS time and the international time, or the like) to the leap second correction value LS.

For example, the radio-controlled timepiece 1 may display the leap second correction value LS by a combination of the minute hand 52b and the second hand 52 c. As a first specific example in this case, the radio-controlled timepiece 1 may indicate the 1-digit value of the adjustment target value by the position of the second hand 52c and the 10-digit value by the position of the minute hand 52 b. Fig. 10 shows a display example in this case. In the example of fig. 10, the minute hand 52b indicates the 3-point direction, and the second hand 52c indicates the 4-point direction, and therefore, 34 seconds are displayed as the adjustment target value. In the state where such display is performed, the user can perform the leap second correction value LS correction by rotating the table handle S3.

At this time, the radio-controlled timepiece 1 may display the value of the Rollover Counter (Rollover Counter) together with the position of the hour hand 52 a. Here, the value of the rollover counter indicates the number of times the overflow of the week number WN occurs after a predetermined start time point. The week number WN included in the information transmitted from the GPS satellite is 10-bit information, and the maximum value thereof is 1023. Therefore, an overflow of the week number WN is generated every 1024 weeks (about 20 years), and is reset to 0. Then, the radio-controlled timepiece 1 may have a function of a rollover counter for counting the number of overflows. In this case, the radio-controlled timepiece 1 adds 1 to the value of the rollover counter when the week number WN overflows. Thus, even if the radio-controlled timepiece 1 is used for a long period of time of 20 years or longer, by combining the value of the rollover counter and the week number WN, it can be known that the current time is counted from the predetermined start time point to the next week, and the calendar date can be displayed based on this information. In the display example of fig. 10, based on the calendar date thus obtained, a calendar display is performed by the calendar window 54. The radio-controlled timepiece 1 may be switched from the time display mode to the calendar display mode in which the calendar date is displayed by the pointer 52, in accordance with an instruction from the user without using the calendar window 54.

However, when the radio-controlled timepiece 1 having the rollover counter function is stopped for a long time including the timing at which the overflow of the week number WN occurs, the rollover counter value may not count up at the time of the overflow of the week number WN, and it is not known that the current time is the next week. Then, as shown in fig. 10, the value of the rollover counter stored in the RAM33 of the radio-controlled timepiece 1 is displayed and can be corrected by the user's operation input, thereby coping with this situation. In the example of fig. 10, the direction of point 1 is indicated by the hour hand 52a, indicating that the value of the rollover counter is 1. In this state, for example, the user can change the value of the rollover counter by operating the first operation button S1.

Fig. 11 shows a second example of a method of displaying an adjustment target value by a combination of the minute hand 52b and the second hand 52 c. In the second specific example, the radio-controlled timepiece 1 rotates the minute hand 52b and the second hand 52c at the same position when it advances from 0 minutes per 0 seconds to the same number of seconds as the adjustment target value. That is, when the adjustment target value is less than 60 seconds, the radio-controlled timepiece 1 displays the numerical value thereof by the position of the second hand 52 c. At this time, the minute hand 52b indicates a position of 0 minutes (12-point direction, or a position at which the rotation angle from the 12-point direction is less than 6 degrees). When the adjustment target value is 60 seconds or more and less than 120 seconds, the minute hand 52b indicates a position of 1 minute (a position where the rotation angle from the 12-point direction is 6 degrees or more and less than 12 degrees), and the second hand 52c indicates a position where the 60 value is subtracted from the adjustment target value. In the example of fig. 11, the minute hand 52b and the second hand 52c move at positions indicating the time of 1 minute and 15 seconds, thereby indicating that the adjustment target value is 75 seconds. In this example, the value of the inversion counter is not displayed at the same time as the adjustment target value, and is displayed in a different correction state, for example, by the second hand 52c indicating a position of several seconds. In this example, as in fig. 10, the calendar window 54 displays a calendar based on the calendar date obtained by combining the value of the rollover counter and the information of the week number WN.

The radio-controlled timepiece 1 may display the adjustment target value using hands different from the hour hand 52a, minute hand 52b, and second hand 52c for time display. Fig. 12 shows a display example in this case. In this example, the hour hand 52a, the minute hand 52b, and the second hand 52c are disposed on the dial 53, and the first small hand 52d, the second small hand 52e, the third small hand 52f, and the fourth small hand 52g are disposed thereon. The first small hand 52d and the second small hand 52e are rotatably disposed about a common rotation axis on the 9-point side of the dial 53, and the third small hand 52f and the fourth small hand 52g are rotatably disposed about a common rotation axis on the 3-point side of the dial 53. The radio-controlled timepiece 1 displays the adjustment target value using these small hands in the leap second manual correction state M4. Specifically, the radio-controlled timepiece 1 displays the adjustment target value corresponding to the leap second correction value LS before update by the first hand 52d and the second hand 52e, and displays the adjustment target value after adjustment at S3 by the user operation table by the third hand 52f and the fourth hand 52 g. The method of displaying the adjustment target value using the two small hands may be the same as the method of displaying the adjustment target value by the combination of the minute hand 52b and the second hand 52c described above. In the leap second manual correction state M4, when the user operates the rotary watch knob S3, only the third hand piece 52f and the fourth hand piece 52g rotate in accordance with the user' S operation while the positions of the first hand piece 52d and the second hand piece 52e are maintained. Thus, the user can adjust the leap second correction value LS while being able to check the adjustment target value before the user instructs the user to change the adjustment target value at any time.

In the example of fig. 12, the user can input the changed adjustment target value by operating the operation unit 60 and also input the time (application time) to be applied to the leap second correction value LS corresponding to the input adjustment target value. The radio-controlled timepiece 1 changes the leap second correction value LS corresponding to the input whole object value at a timing corresponding to the application time. Specifically, the radio-controlled timepiece 1 receives the input of the adjustment target value and the application time from the user, and continues to use the leap second correction value LS before the input reception as it is until the input application time arrives. When the input application time arrives, the old leap second correction value LS is overwritten with the leap second correction value LS corresponding to the adjustment target value received together with the application time since that. Accordingly, the user can instruct the radio-controlled timepiece 1 of the leap second correction value LS to be changed in the future and the future time at which the leap second correction value LS is valid, immediately at the time of the notice of the change of the leap second correction value LS in the future. For example, the radio-controlled timepiece 1 displays the update timing by the hour hand 52a and minute hand 52 b. Specifically, in the example of fig. 12, the hour hand 52a indicates the month of the update time, the minute hand 52b indicates the day of the update time, and in the figure, the hour hand 52a and the minute hand 52b indicate the time 7 and 1 minute, and therefore, 7 months and 1 day are set as the update time. In the leap second manual correction state M4, the user switches the operation target among the adjustment target value, the month of the update time, and the day of the update time by operating the first operation button S1 or the second operation button S2, and changes the value of each operation target through the operation table S3. In fig. 12, the second hand 52c indicates the 11-point direction between "LS-OK" and "LS-NG" to indicate that the leap second manual correction state M4 is present.

In addition, the radio-controlled timepiece 1 can display when the leap second correction value LS is valid (that is, when the valid period of the leap second correction value LS expires) at the same time when the leap second correction value LS is valid in the leap second valid display state M2. In this case, the radio-controlled timepiece 1 performs the display illustrated in fig. 13 instead of the above-described displays of fig. 6 (b) and 9 (b). In fig. 13, the hour hand 52a and minute hand 52b indicate the date and month of the expiration date. Here, similarly to the display of the update time in fig. 12, the hour hand 52a indicates a month whose expiration date has expired, and the minute hand 52b indicates a day. In fig. 13, hour hand 52a and minute hand 52b indicate time 1, 1 minute, and therefore the leap second correction value LS currently stored indicates that the last day of 12 months is valid, and 1 month and 1 day indicate that the valid period has expired. In fig. 13, the second hand 52c indicates "LS-OK" as in fig. 6 (b) and 9 (b).

In the above description, in the state of fig. 6 (b) and 9 (b) (indicating that the leap second correction value LS is valid), the user does not transit to the leap second manual correction state M4 even if the user manipulates the table S3, unlike the state of fig. 6 (c) and 9 (c) (indicating that the leap second correction value LS is invalid). Here, when the user performs an operation of pulling out the table handle S3 while the leap second correction value LS is valid, the radio-controlled timepiece 1 may display information related to the currently set leap second correction value LS instead of shifting to the leap second manual correction state M4. Fig. 14 shows an example of display in this case, and shows an example of display at the time of S3 in the state shown in fig. 13. In this figure, as described above with reference to fig. 10 and 11, the adjustment target value corresponding to the leap second correction value LS is displayed using the minute hand 52b and the second hand 52c, and the information about the reception environment at the time of the leap second correction value LS received from the previous GPS satellite is indicated by the fifth hand 52h and the sixth hand 52 i. Specifically, the fifth hand 52h indicates the satellite number information indicating the leap second correction value LS received from one of the GPS satellites. The sixth hand 52i indicates information indicating which area (city) has received the leap second correction value LS. In this state, when the push handle S3 is pushed, the radio-controlled timepiece 1 returns to the time display state M1. Although the information related to the leap second correction value LS is displayed when a predetermined operation is performed again in the state where the display of fig. 13 is performed, the radio-controlled timepiece 1 is not limited to this, and when the validity period is displayed as shown in fig. 13, the information of the received satellite number, the information of the city at the time of reception, and the like may be displayed at the same time.

Claims (6)

1. A radio-controlled timepiece that receives a signal including time information from a satellite and corrects time, comprising:

a storage device that stores a leap second correction value for correcting the leap second of the time information;

leap second display means for displaying a numerical value corresponding to the leap second correction value stored in the storage means;

an instruction receiving device that receives an instruction operation to change the leap second correction value from a user in a state where the leap second display device is displaying the leap second; and

leap second correction value changing means for changing the leap second correction value stored in the storage means in accordance with the received instruction operation,

the storage means also stores information relating to the validity period of the leap second correction value,

the leap second correction value changing means updates the information on the valid period when the leap second correction value is changed,

the radio-controlled timepiece further includes a determination result display device that determines whether the leap second correction value stored in the storage device is valid using the information on the expiration date, and displays the determination result.

2. A wave timepiece as claimed in claim 1, characterized in that:

the instruction accepting means accepts the instruction operation from the user in a state where the determination result display means displays that the leap second correction value stored in the storage means is not valid, and restricts acceptance of the instruction operation in a state where the determination result display means displays that the leap second correction value stored in the storage means is valid.

3. A wave timepiece according to claim 1 or 2, characterized in that:

the signal from the satellite contains information relating to the leap second correction value,

the radio-controlled timepiece further includes leap second information receiving means for receiving a signal containing information on the leap second correction value from a satellite, changing the leap second correction value stored in the storage means in accordance with the received signal,

the leap second information receiving device updates the information on the expiration date when the information on the leap second correction value is extracted.

4. A wave timepiece as claimed in claim 1, characterized in that:

the leap second display means displays the value corresponding to the leap second correction value by a combination of the second hand and the minute hand.

5. A wave timepiece as claimed in claim 1, characterized in that:

the instruction receiving means receives an instruction operation for changing the leap second correction value from a user, receives an input operation of information indicating an application time at which the changed leap second correction value is applied,

the leap second correction value changing means changes the leap second correction value stored in the storage means at a timing corresponding to the applicable time.

6. A wave timepiece as claimed in claim 1, characterized in that:

and a determination result display unit that displays the determination result and the expiration date when the leap second correction value stored in the storage unit is determined to be valid.