Radio-controlled timepiece, system and control method of a radio-controlled timepiece

Abstract

Provided are an electric wave correction timepiece, a system, and a control method for the electric wave correction timepiece, which can immediately correct to a local time even in an airport building and can do so without complicated operations. The electric wave correction timepiece is characterized by including a reception unit that receives satellite electric waves containing first time information, a close-range reception unit that receives electric waves containing second time information transmitted from a portable device, an operation unit that accepts an instruction operation, a reception control unit that selectively executes first reception processing that causes the reception unit to operate to acquire the first time information at a preset time, and second reception processing that causes the close-range reception unit to operate to acquire the second time information based on the instruction operation from the operation unit, and a time correction unit that corrects a displayed time based on the first time information acquired in the first reception processing or the second time information acquired in the second reception processing.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric wave correction timepiece, a system, and a control method for an electric wave correction timepiece. BACKGROUND

[0002] An electronic timepiece that receives a satellite signal from a position information satellite such as a GPS (Global Positioning System) to correct a time is disclosed in Patent Literature 1.

[0003] An electronic timepiece that acquires information from a device in the vicinity by performing Bluetooth (registered trademark)-based close proximity wireless communication with the device to correct a time is disclosed in Patent Literature 2.

[0004] Patent Literature 1: Japanese Patent Application Publication No. 2009-168620

[0005] Patent Literature 2: Japanese Patent Application Publication No. 2002-328190

[0006] The electronic timepiece of Patent Literature 1 cannot correct a time in an environment where a satellite signal cannot be received, such as inside a building. Therefore, when an airplane moves across time zones and arrives at an airport, a satellite signal cannot be received inside the airport building, and thus a time cannot be corrected. Therefore, a time zone cannot be corrected until the airplane moves outside the airport building to the outside, and thus a local time cannot be immediately corrected.

[0007] On the other hand, the electronic timepiece of Patent Literature 2 requires an application program that communicates with the electronic timepiece to be started in advance in a smartphone, for example, in a case where close proximity wireless communication is performed between the smartphone and the electronic timepiece, and this is troublesome for a user. SUMMARY

[0008] The electric wave correction timepiece of the present disclosure is characterized by including a reception unit that receives a satellite wave containing first time information, a close proximity reception unit that receives a wave containing second time information transmitted from a portable device, an operation unit that accepts an instruction operation, a reception control unit that selectively executes a first reception process of causing the reception unit to operate to acquire the first time information at a time set in advance and a second reception process of causing the close proximity reception unit to operate to acquire the second time information according to an instruction operation from the operation unit, and a time correction unit that corrects a displayed time according to the first time information acquired in the first reception process or the second time information acquired in the second reception process.

[0009] The system disclosed herein is a system having the radio-controlled clock and the portable device, characterized in that the portable device has a second operation unit, and is set to a communication prohibition mode by operation of the second operation unit, which prohibits communication with other devices, and when the communication prohibition mode is lifted by operation of the second operation unit, it begins to communicate with the radio-controlled clock.

[0010] The control method for a radio-controlled clock disclosed herein comprises: a receiving unit that receives satellite radio waves containing first time information; a near-field receiving unit that receives radio waves containing second time information transmitted from a portable device; and an operation unit that accepts instruction operations. The control method is characterized in that, upon reaching a predetermined time, a first reception process based on the receiving unit is executed; a second reception process based on the near-field receiving unit is executed according to the instruction operation from the operation unit; and the displayed time is corrected based on the first time information obtained in the first reception process or the second time information obtained in the second reception process. Attached Figure Description

[0011] Figure 1 This is a diagram showing a system of a radio wave correction clock and a portable device having the first embodiment.

[0012] Figure 2 This is a front view showing the radio-controlled clock.

[0013] Figure 3 This is a cross-sectional view showing the radio wave correction clock.

[0014] Figure 4 This is a block diagram showing the circuit structure of the radio wave correction clock.

[0015] Figure 5 This is a block diagram showing the structure of the control unit of the radio wave correction clock.

[0016] Figure 6 This is a diagram illustrating an example of the screen display of the portable device.

[0017] Figure 7 This is a flowchart illustrating the receiving and processing of the radio wave correction clock.

[0018] Figure 8 This is a flowchart illustrating the BLE communication processing of the radio wave correction clock.

[0019] Figure 9 This is a diagram illustrating an example of the screen display of the portable device.

[0020] Figure 10This is a flowchart illustrating the GPS time measurement and reception processing of the radio wave correction clock.

[0021] Figure 11 This is a flowchart illustrating the operation of the radio wave correction clock according to the second embodiment.

[0022] Label Explanation

[0023] 1: Radio-controlled watch; 2: Outer case; 3: Hands; 3B: Second hand; 3C: Minute hand; 3D: Hour hand; 4: Hand axis; 4B: Second hand axis; 4C: Minute hand axis; 4D: Hour hand axis; 5: Case back; 5A: Date window; 5B: Date wheel; 6: Crown; 7A: Button A; 7B: Button B; 10: System; 11: Dial; 13: Case body; 14: Bezel; 15: First strap; 16: Second strap; 20: Movement; 21: Base plate; 22: Solar panel; 23: Drive mechanism; 24: Secondary battery; 25: Circuit board; 26: Circuit board; 31: Glass cover 32: Scale ring; 40: Loop antenna; 40A: GPS antenna; 40B: Short-range wireless communication antenna; 44: Power supply pin; 45: Power supply pin; 50: GPS receiver module; 51: RF section; 52: Baseband section; 54: Flash memory; 59: SAW filter; 60: Control and display module; 61: Control section; 62: Drive circuit; 63: Quartz oscillator; 66: RTC; 67: ROM; 68: Storage section; 70: Power supply module; 71: Charging control circuit; 72: First regulator; 73: Second regulator; 74: Voltage detection circuit; 90: Ground plane; 90A 100: Conducting spring; 101: Portable device; 102: Display; 110: Operation menu; 111: Time zone correction screen; 112: Basic clock correction screen; 113: Small clock correction screen; 150: Short-range wireless communication module; 401: Substrate; 402: No power supply component; 403: Power supply component; 404: Coupling unit; 407: Power supply component; 408: Coupling unit; 610: Time information correction unit; 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: Timing receiver control unit; 644: Positioning receiver control unit; 645: Short-range wireless communication control unit; 646: Receiver determination unit; 770: First small window; 771: Pointer; 773: Pointer axis; 780: Second small window; 781: Pointer; 783: Pointer axis; 790: Third small window; 791: Pointer; 792: Pointer; 793: Pointer axis; 1500: RF unit; 1600: Baseband unit; 1610: Demodulation unit; 1620: Modulation unit; 1700: BLE controller unit; 1701: Quartz oscillator; R1: Receiver unit; R2: Short-range receiver unit. Detailed Implementation

[0024] [First Implementation]

[0025] Figure 1 This diagram illustrates the structure of system 10 according to this embodiment. System 10 includes a radio-corrected clock 1 and a portable device 100. The portable device 100 is a smartphone, tablet computer, mobile computer, etc., configured to communicate with a server (not shown) via a base station constituting a mobile communication network or a public wireless LAN (Local Area Network) or the Internet. The portable device 100 can obtain time information via a mobile communication network, etc., and therefore can automatically display the time consistent with the current location.

[0026] [Radio-controlled clocks]

[0027] like Figure 1 As shown, the radio-corrected clock 1 of this embodiment is configured to receive satellite signals from multiple GPS satellites and quasi-zenith satellites (S) orbiting the Earth in predetermined orbits, obtain satellite time information, and correct the displayed time. Furthermore, the radio-corrected clock 1 has a solar panel as a power generation device and a secondary battery that stores the electricity generated by the solar panel.

[0028] Therefore, the radio wave correction clock 1 has a solar energy function that converts light energy such as sunlight into electrical energy, and a satellite radio wave correction function that displays the current location and time based on satellite signals received from location information satellites.

[0029] In addition, since the voltage generated by a solar panel varies depending on the energy of the irradiated light, it can also be used as a light sensor to detect whether the amount of irradiated light is above a threshold level.

[0030] like Figure 2 and Figure 3 As shown, the radio-controlled clock 1 has a dial 11 and an outer casing 2. The outer casing 2 has a casing body 13 formed in a generally cylindrical shape, an annular bezel 14 fixed to the front side of the casing body 13, a glass cover 31 fixed to the bezel 14, and a back cover 5 fixed to the back side of the casing body 13.

[0031] In addition, in this embodiment, the housing body 13 and the rear cover 5 are separate components, but it is not limited to this and an integral housing body 13 and the rear cover 5 can also be used.

[0032] Furthermore, in the following description, the view of the radio wave correction clock 1 from a direction perpendicular to the front of the dial 11 is referred to as a top view.

[0033] like Figure 2As shown, the radio-controlled clock 1 has a button A 7A located at 2 o'clock, a button B 7B located at 4 o'clock, and a crown 6 located at 3 o'clock. Operating the buttons A 7A, B 7B, and crown 6 outputs corresponding operation signals. Therefore, the buttons A 7A, B 7B, and crown 6 are the operating units in the radio-controlled clock 1 that receive user input.

[0034] A first watch strap 15 is connected to the 12 o'clock side of the outer casing 2, and a second watch strap 16 is connected to the 6 o'clock side. The first watch strap 15 and the second watch strap 16 are connected by a buckle (not shown). The first watch strap 15 and the second watch strap 16 are metal watch straps with end pieces made of titanium or other metals mounted on the outer casing 2 and multiple links. However, the watch straps are not limited to metal; they can also be leather or resin straps, etc.

[0035] Dial 11 is formed into a circular plate shape from non-conductive components such as polycarbonate. For example... Figure 2 As shown, a pointer axis 4 is disposed at the center of the dial 11 and extends through the dial 11. Figure 3 As shown, the pointer axis 4 has a second hand axis 4B, a minute hand axis 4C, and an hour hand axis 4D. A second hand 3B, a minute hand 3C, and an hour hand 3D, serving as pointers 3 for displaying the current time, are mounted on each axis. A scale ring 32 is arranged on the outer periphery of the dial 11.

[0036] like Figure 2 As shown, the radio-controlled clock 1 is a multi-functional clock with three small windows (sub-dials) 770, 780, 790, pointer axes 773, 783, 793, and pointers 771, 781, 791, 792 mounted on each pointer axis 773, 783, 793.

[0037] The first small window 770 is positioned at the 2 o'clock position relative to the center of the dial 11. The second small window 780 is positioned at the 10 o'clock position relative to the center of the dial 11. The third small window 790 is positioned at the 6 o'clock position relative to the center of the dial 11.

[0038] On the dial 11, a rectangular date window 5A is provided between 4 and 5 o'clock, relative to the center of its plane. A date wheel 5B is arranged on the back side of the dial 11, and the date wheel 5B can be seen from the date window 5A.

[0039] In this embodiment, pointer 771 of the first window 770 is the pointer of a 60-minute chronograph. Pointer 781 of the second window 780 also serves as a mode hand indicating various information and the hour hand of the chronograph. Pointers 791 and 792 of the third window 790 are the minute and hour hands of a small clock indicating hometown time and local time.

[0040] The aforementioned second hand 3B, minute hand 3C, hour hand 3D, hands 771, 781, 791, 792, and date wheel 5B are driven by a motor and gear train (not shown in the diagram).

[0041] In the second small window 780, indicated by the pointer 781 which serves as the mode pointer, there is a power indicator showing the remaining amount of the secondary battery 24, a scale indicating the settings of each mode, including flight mode, GPS satellite signal reception mode, and short-range wireless communication mode, as well as a scale indicating the hour of the chronograph.

[0042] The power indicator is displayed in a band from approximately 9 o'clock to 8 o'clock in the second small window 780, with 9 o'clock indicating F (Full) and 8 o'clock indicating E (Empty). That is, when the battery voltage of the secondary battery 24 is above a first threshold, pointer 781 indicates F, indicating sufficient charging; when the battery voltage is below a second threshold (lower than the first threshold), pointer 781 indicates E, indicating insufficient charging. When the battery voltage is above the second threshold but below the first threshold (a predetermined value), pointer 781 indicates between F and E, indicating a decrease in charging.

[0043] The aircraft icon indicating flight mode is displayed at approximately 9.5 o'clock in the second small window 780. As will be described later, flight mode is an example of an automatic reception disabled mode that does not initiate automatic reception processing even when automatic reception conditions are met.

[0044] The "1" indicating the timing mode for receiving mode is displayed at approximately 10 o'clock, and the "4+" indicating the positioning mode is displayed at approximately 11 o'clock.

[0045] The symbol “BLE”, representing the near-field wireless communication mode, is displayed throughout the second small window 780 from the 6 o'clock position to approximately the 8 o'clock position.

[0046] The chronograph's hour scale is set to 6 hours from the 12 o'clock position in the second small window 780, through the 3 o'clock position, to the 6 o'clock position.

[0047] [Internal structure of radio-controlled watches]

[0048] Next, the internal structure of the outer casing 2 built into the radio wave correction clock 1 will be described.

[0049] Figure 3 This is a cross-sectional view of the main parts of the radio-controlled clock 1. (See image.) Figure 3As shown, a cylindrical bezel 14 is fitted onto the upper side (front side) of the cylindrical housing body 13, and the opening on the upper side of the bezel 14 is covered by a circular glass cover 31. Additionally, the opening on the lower side (back side) of the housing body 13 is covered by a back cover 5. The housing body 13 and the back cover 5 are fixed, for example, by a screw groove. The outer housing 2 of the radio-controlled clock 1 is, for example, composed of the housing body 13, the bezel 14, the glass cover 31, and the back cover 5.

[0050] The main body 13, back cover 5, and bezel 14, which form the main components of the outer casing 2, are made of metals such as stainless steel, titanium, aluminum, and brass. Alternatively, the bezel 14 can be made of ceramics such as zirconium oxide (ZeO2), titanium carbide (TiC), titanium nitride (TiN), and alumina (Al2O3). If the bezel 14 is made of ceramic, it offers advantages such as improved wireless communication performance due to the radio wave transmission capability of ceramics, and its hardness provides excellent damage resistance and allows it to maintain its aesthetic appeal over a long period.

[0051] Inside the outer casing 2, in addition to the dial 11, there are also scale rings 32, movement 20, loop antenna 40, etc.

[0052] The mechanism 20 includes a base plate 21, a solar cell panel 22, a drive mechanism 23, a secondary battery 24, a circuit board 25, and a circuit pressure plate 26.

[0053] The scale ring 32 is formed in a circular shape and is located on the lower side of the glass cover 31, arranged along the inner circumference of the bezel 14. The outer circumference of the scale ring 32 is a flat portion that contacts the bezel 14, and the inner circumference is an inclined portion that slopes inward. A ring-shaped storage space is provided on the lower side of the scale ring 32, in which a circular loop antenna 40 is stored. The loop antenna 40 is arranged around the dial 11. Specifically, it is arranged in a position that is inside the inner circumference of the housing body 13 and the bezel 14, and is covered by the scale ring 32.

[0054] A ring-shaped ground plane 90 made of conductive material such as metal is provided on the lower side of the loop antenna 40. Through holes are formed on the ground plane 90 and the base plate 21, through which power supply pins 44 and 45 are inserted.

[0055] Additionally, a through hole is formed on the base plate 21, through which a conductive pin (not shown) for supplying ground potential to the grounding plate 90 is inserted. At least one conductive pin is provided, for example, four pins, and they abut against the grounding plate 90. Therefore, the potential of the grounding plate 90 is maintained at ground potential. Furthermore, the grounding plate 90 has multiple conductive springs 90A that contact the inner circumferential surface of the housing body 13. Therefore, the potential of the housing body 13 is maintained at the same potential as the grounding plate 90, i.e., ground potential.

[0056] A dial 11 and a solar panel 22 are disposed inside the loop antenna 40. The dial 11 is made of a light-transmitting, non-conductive material such as plastic. The solar panel 22 is a circular flat plate formed by connecting multiple solar cells in series to convert light energy into electrical energy. The dial 11 and the solar panel 22 are arranged overlappingly and are respectively provided with holes through which the pointer shafts 4, 773, 783, and 793 pass.

[0057] A base plate 21 made of non-conductive materials such as plastic or ceramic is provided on the underside of the solar cell panel 22.

[0058] like Figure 3 As shown, a drive mechanism 23 is provided on the underside of the base plate 21 to rotate the pointer shaft 4 and drive the pointer 3. The drive mechanism 23 has a stepper motor and a gear train, etc. The stepper motor rotates the pointer shaft 4 via the gear train, thereby driving the pointer 3. In addition, the stepper motor and the gear train are appropriately set in the movement 20.

[0059] For example, in the movement 20 of this embodiment, there are six stepper motors: a second motor for the second hand 3B, an hour and minute motor for the minute hand 3C and the hour hand 3D, a date wheel motor for the date wheel 5B, a chronograph minute motor for the hand 771, a mode and chronograph hour motor for the hand 781, and a small clock motor for the hands 791 and 792.

[0060] A circuit board 25 is provided on the underside of the base plate 21 and the drive mechanism 23. Circuit blocks including a GPS receiver module 50, a control display module 60, a power supply module 70, and a short-range wireless communication module 150 are mounted on the lower surface (back side) of this circuit board 25. Each module 50, 60, 70, and 150 is, for example, composed of a single-chip IC module, including analog and digital circuits. Details of each module 50, 60, 70, and 150 will be described later.

[0061] [Loop Antenna]

[0062] Next, the structure of the loop antenna 40 will be explained.

[0063] The loop antenna 40 has both a 1.5 GHz electrode pattern for GPS reception and a 2.4 GHz electrode pattern for BLE communication. Specifically, it has: a ring-shaped substrate 401 formed of a dielectric such as plastic or ceramic, a non-powered element 402 formed on the front side of the substrate 401, conductive powered elements 403 and 407 supplied with a predetermined potential, and coupling portions 404 and 408.

[0064] The circular central axis of the substrate 401 and the ground plane 90 is the same, which coincides with the pointer axis 4. The separation distance between the substrate 401 and the ground plane 90 is set to a distance that allows resonance to be generated between the ground plane 90 and the power supply element 403 disposed on the substrate 401 to receive radio waves.

[0065] The non-powered element 402, power-feeding elements 403 and 407, and coupling parts 404 and 408 are all formed of conductive materials such as metal, for example, by plating or silver paste printing. The material of the substrate 401 is adjusted to a relative permittivity of about 5 to 20 by mixing a dielectric material such as titanium oxide, which can be used at high frequencies, into the resin. In addition, the cross-section of the substrate 401 is pentagonal. That is, the substrate 401 has: an outer peripheral surface along the inner peripheral surface of the bezel 14; an upper surface that is continuous with the upper end of the outer peripheral surface, i.e., the end on the scale ring 32 side; a bottom surface that is continuous with the lower end of the outer peripheral surface, i.e., the end on the ground plate 90 side; a first inclined surface that is continuous with the inner peripheral end of the upper surface and inclined toward the base plate 21 side; and a second inclined surface disposed between the first inclined surface and the bottom surface.

[0066] A power-free element 402 is formed on the upper surface of the substrate 401, while power-powered elements 403 and 407 are formed on the first inclined surface of the substrate 401. Furthermore, coupling portions 404 and 408 are formed throughout the second inclined surface and the bottom surface, connecting the power-powered elements 403 and 407 to the power supply pins 44 and 45. Therefore, the coupling portions 404 and 408 are formed corresponding to the positions where the power supply pins 44 and 45 are located, providing a predetermined potential to the power-powered elements 403 and 407 via the power supply pins 44 and 45 and the coupling portions 404 and 408.

[0067] On the other hand, no potential is supplied from the outside to the unpowered component 402.

[0068] The non-powered element 402 is formed in a ring shape along the upper surface of the substrate 401. On the other hand, the powered elements 403 and 407 are respectively formed in a roughly semi-circular arc shape when viewed from above.

[0069] The power supply element 403 is an electrode pattern for GPS receivers, having an antenna length that resonates with the 1.5 GHz satellite signal transmitted from GPS satellites.

[0070] The power supply element 407 is an electrode pattern for BLE communication and has an antenna length that resonates with 2.4 GHz radio waves for short-range wireless communication.

[0071] These power supply elements 403 and 407 are formed in positions that do not overlap when viewed from above. For example, power supply element 403 can be formed along the range of the dial 11 from 4 o'clock through 6 o'clock to 8 o'clock, and power supply element 407 can be formed along the range of the dial 11 from 10 o'clock through 12 o'clock to 2 o'clock. Coupling portion 404 is formed within the range where power supply element 403 is formed, for example at the 6 o'clock position, and coupling portion 408 is formed within the range where power supply element 407 is formed, for example at the 12 o'clock position.

[0072] The unpowered element 402 is disposed separately from the powered elements 403 and 407, and is configured such that when current flows through either the powered elements 403 or 407, a current is induced in the unpowered element 402. Therefore, the powered elements 403 and 407 and the unpowered element 402 together function as an antenna element that converts electromagnetic waves into current.

[0073] [Circuit structure of radio-controlled clocks]

[0074] Figure 4 This is a block diagram showing the circuit structure of the radio wave corrected clock 1.

[0075] The radio-controlled clock 1 has a control display module 60, a GPS receiver module 50, a short-range wireless communication module 150, and a power supply module 70 respectively disposed on the circuit board 25.

[0076] [GPS receiver module]

[0077] The GPS receiver module 50 receives satellite radio waves containing first-time information from the GPS satellite, which is a position information satellite S, via a power supply element 403 of the loop antenna 40, a GPS antenna 40A implemented by a power-free element 402, and a SAW (Surface Acoustic Wave) filter 59, and processes the satellite signal. Therefore, the GPS receiver module 50, the GPS antenna 40A, and the SAW filter 59 are an example of a receiving unit R1 that receives satellite radio waves containing first-time information.

[0078] SAW filter 59 is a bandpass filter that allows 1.5 GHz satellite signals to pass through. Alternatively, an LNA (low-noise amplifier) ​​can be inserted between the GPS antenna 40A and SAW filter 59 to improve receiver sensitivity. Alternatively, SAW filter 59 can be integrated into the GPS receiver module 50.

[0079] The GPS receiver module 50 processes the satellite signals after passing through the SAW filter 59. It has an RF (Radio Frequency) section 51, a baseband section 52, a quartz oscillator circuit (TCXO) 53 with temperature compensation circuitry, and a flash memory 54.

[0080] The RF section 51 includes a PLL (Phase Locked Loop) 511, a VCO (Voltage Controlled Oscillator) 512, an LNA (Low Noise Amplifier) ​​513, a mixer 514, an IF (Intermediate Frequency) amplifier 515, an IF filter 516, and an ADC (A / D converter) 517.

[0081] PLL 511 and VCO 512 generate a local oscillation signal with a frequency corresponding to the receiving frequency based on the clock generated by TCXO 53.

[0082] The satellite signal passing through SAW filter 59 is amplified by LNA 513 and then down-converted to an IF signal in the IF band by mixer 514 and local oscillator signal from VCO 512.

[0083] The IF signal output from mixer 514 passes through IF amplifier 515 and IF filter 516, and is converted into a digital signal by ADC (A / D converter) 517.

[0084] The baseband section 52 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.

[0085] In addition, TCXO 53 and flash memory 54 are also connected to the baseband section 52.

[0086] Furthermore, the baseband unit 52 receives digital signals from the ADC 517 of the RF unit 51 and performs related processing and positioning calculations, thereby obtaining satellite time information and positioning information.

[0087] Furthermore, the baseband unit 52 stores the leap second data contained in the satellite signal in the SRAM 524, so it can use the leap second to correct the acquired satellite time information, i.e., Z count, calculate the Coordinated Universal Time (UTC), and output it to the control unit 61.

[0088] The clock, which serves as the basis for the local oscillation signal, is provided from the TCXO 53 to the PLL 511 via the baseband section 52.

[0089] [Data in flash memory]

[0090] Time zone databases and other information are stored in flash memory 54. In this embodiment, the information in flash memory 54 is obtained from a nearby portable device 100 via short-range wireless communication using the BLE (Bluetooth Low Energy) standard and stored in flash memory 54.

[0091] The time difference database maps location information determined by latitude and longitude to the time difference information of the location. Therefore, when the GPS receiver module 50 obtains location information in positioning mode, it can obtain the time difference information, i.e., the time difference relative to UTC, based on the location information (latitude and longitude), and output it to the control unit 61.

[0092] Therefore, when the GPS receiving module 50 constituting the receiving unit R1 successfully receives satellite radio waves in timing mode, it outputs UTC as the first time information. When the satellite radio waves are successfully received in positioning mode, it outputs UTC and time difference information as the first time information.

[0093] [Short-range wireless communication module]

[0094] The short-range wireless communication module 150 performs BLE standard short-range wireless communication through a short-range wireless communication antenna 40B implemented by a power supply element 407 of the loop antenna 40 and a non-power supply element 402, receiving and processing radio waves containing second-time information transmitted from a nearby portable device 100. Therefore, the short-range wireless communication module 150 and the short-range wireless communication antenna 40B are examples of a short-range receiving unit R2 that receives radio waves containing second-time information transmitted from the portable device 100.

[0095] The near-field wireless communication module 150 includes an RF (Radio Frequency) section 1500, a baseband section 1600, a BLE controller section 1700, and a quartz oscillator 1701 that generates a 16MHz master clock.

[0096] The RF section 1500 is a circuit that down-converts the short-range wireless communication signal received via the short-range wireless communication antenna 40B into an IF signal suitable for demodulation, and up-converts the IF signal modulated according to the transmitted information into a high-frequency signal.

[0097] In the RF section 1500, the LNA (Low Noise Amplifier) ​​1511 amplifies the short-range wireless communication signal received by the short-range wireless communication antenna 40B at high frequency, and the BPF 1512 removes noise from the LNA 1511 that is not needed in the frequency band.

[0098] The synthesizer consisting of PLL 1501 and VCO 1502 provides a local oscillation signal with a frequency corresponding to the receiving tuning frequency to mixer 1513.

[0099] Mixer 1513 downconverts the signal output from BPF 1512 with a local oscillator signal to output an IF signal.

[0100] The IF amplifier 1514 amplifies the IF signal, and the ADC (Analog Digital Converter) 1515 converts the IF signal output by the IF amplifier 1514 into a digital signal and provides it to the baseband unit 1600.

[0101] In addition, in the RF section 1500, the DAC (Digital Analog Converter) 1521 converts the digital signal modulated according to the transmitted information (baseband signal) into an IF signal as an analog signal, and the IF amplifier 1522 amplifies the IF signal.

[0102] Mixer 1523 performs up-conversion by mixing the intermediate frequency signal output from the IF amplifier 1522 with a local oscillator signal generated by a filter consisting of PLL 1501 and VCO 1502, and outputs a high-frequency signal in the frequency band corresponding to the transmission tuning frequency.

[0103] The BPF 1524 removes noise from the high-frequency signal output by the mixer 1523 that is not needed in the frequency band.

[0104] The PA (Power Amplifier) ​​1525 amplifies the high-frequency signal output from the BPF 1524 and radiates it from the short-range wireless communication antenna 40B.

[0105] The baseband section 1600 includes a demodulation section 1610 and a modulation section 1620.

[0106] Here, the demodulation unit 1610 demodulates the received information from the digital IF signal output by the ADC 1515 of the RF unit 1500 and provides it to the BLE controller unit 1700. The received information is transmission information sent from the portable device 100, which is the communication counterpart, and includes second time information. Specifically, the second time information is UTC and time difference information. That is, the portable device 100 can obtain the time difference information between the UTC and its current location via a mobile communication network, etc., and transmit this UTC and time difference information as the second time information. Therefore, the demodulation unit 1610 outputs the second time information, i.e., the UTC and time difference information, to the BLE controller unit 1700.

[0107] Furthermore, the modulation unit 1620 modulates the carrier wave according to the transmission information provided from the BLE controller unit 1700, generates a digital IF signal, and provides it to the DAC 1521 of the RF unit 1500.

[0108] The BLE controller unit 1700 is a unit that controls BLE-based communication with the portable device 100 by controlling the RF unit 1500 and the baseband unit 1600.

[0109] Furthermore, the BLE controller unit 1700 outputs UTC and time difference information to the control unit 61 as the second time information received and obtained from the portable device 100.

[0110] Furthermore, although the near-field wireless communication module 150 of this embodiment communicates with BLE radio waves, a module that receives NFC (Near Field Communication) radio waves can also be used. The frequency of NFC radio waves is 13.56MHz, so the antenna becomes a loop antenna with 2 to 3 turns, but it can be configured as a loop antenna 40.

[0111] [Control Display Module]

[0112] The control display module 60 includes a control unit (CPU) 61, a drive circuit 62 that drives pointers 3, 771, 781, 791, 792, etc., and a quartz oscillator 63.

[0113] The control unit 61 includes an RTC (Real Time Clock) 66, a ROM 67, and a storage unit 68.

[0114] The RTC 66 uses a reference signal output from the quartz oscillator 63 to keep track of its internal time. This RTC 66 constitutes a time information generation unit. Various programs executed by the control unit 61 are stored in the ROM 67. In this embodiment, the internal time kept track by the RTC 66 is Coordinated Universal Time (UTC). If reception is successful in timing mode or positioning mode, the control unit 61 updates the RTC 66 using the UTC received from the receiver R1; if reception is successful in short-range wireless communication mode, it updates the RTC 66 using the UTC received from the short-range receiver R2.

[0115] The storage unit 68 stores satellite time information and positioning information output from the GPS receiver module 50, as well as time information output from the near-field wireless communication module 150. Furthermore, the storage unit 68 stores the time difference between the time indicated by pointer 3 and UTC, i.e., the first time difference information, and the time difference between the time indicated by pointers 791 and 792 and UTC, i.e., the second time difference information.

[0116] Therefore, if the control unit 61 successfully receives the signal in positioning mode, it stores the time difference information received from the receiving unit R1 as the first time difference information in the storage unit 68. If the control unit 61 successfully receives the signal in short-range wireless communication mode, it stores the time difference information received from the short-range receiving unit R2 as the first time difference information in the storage unit 68.

[0117] The control unit 61 switches and starts the short-range wireless communication module 150 and the GPS receiver module 50 by outputting control signals to the short-range wireless communication module 150 and the GPS receiver module 50.

[0118] GPS satellite signals operate at frequencies as high as 1.5 GHz, and the received signal strength is extremely weak, approximately 1 / 100th of the signal strength. Therefore, the GPS receiver module 50 requires a significant amount of power to process the GPS satellite signals. Consequently, the control unit 61 does not simultaneously activate the short-range wireless communication module 150 and the GPS receiver module 50, but instead switches between them.

[0119] The radio-corrected clock 1 of this embodiment, having a near-field wireless communication module 150, a GPS receiver module 50, and a control display module 60, is able to correct the time display based on time information obtained through near-field wireless communication or time information received from a location information satellite S.

[0120] [Power Supply Module]

[0121] The power supply module 70 includes a charging control circuit 71, a first regulator 72, a second regulator 73, and a voltage detection circuit 74.

[0122] When light is incident on the solar cell panel 22 and the solar cell panel 22 generates electricity, the charging control circuit 71 supplies the power obtained through the photoelectric generation to the secondary battery 24 to charge the secondary battery 24.

[0123] The secondary battery 24 provides driving power to the control display module 60 and the near-field wireless communication module 150 via the first regulator 72, and to the GPS receiver module 50 via the second regulator 73. Thus, the secondary battery 24 constitutes a power supply unit that provides driving power.

[0124] The voltage detection circuit 74 monitors the output voltage of the secondary battery 24 and outputs it to the control unit 61.

[0125] That is, the voltage detection circuit 74 functions as a battery balance detection unit to detect the remaining battery level of the power supply unit, i.e., the secondary battery 24.

[0126] The control unit 61 is input with the battery voltage detected by the voltage detection circuit 74, so it can control the receiving process by knowing the voltage of the secondary battery 24.

[0127] In addition, the charging control circuit 71 can be controlled by the control unit 61, so that the voltage of the solar panel 22 can be detected by the voltage detection circuit 74 when the solar panel 22 and the secondary battery 24 are disconnected.

[0128] In this case, the voltage detection circuit 74 is able to detect the power generation voltage (power generation) of the solar panel 22 without being affected by the voltage of the secondary battery 24.

[0129] Therefore, the voltage detection circuit 74 constitutes a power generation detection unit that detects the power generation of the solar cell panel 22, and the power generation is input to the control unit 61.

[0130] Therefore, the control unit 61 can determine whether light exceeding a threshold level has been irradiated onto the radio wave correction clock 1, i.e., whether it is installed outdoors, based on the power generation of the solar panel 22. Thus, the solar panel 22, the charging control circuit 71, and the voltage detection circuit 74 are examples of light sensors that detect whether the amount of light irradiating the radio wave correction clock 1 is above a threshold level.

[0131] [Structure of the Control Department]

[0132] Figure 5 This is a block diagram showing the functional structure of the control unit 61.

[0133] exist Figure 5 In this unit, the time information correction unit 610, the display control unit 620, the voltage detection control unit 630, and the receiving control unit 640 are functions implemented by the control unit 61, which acts as a CPU, executing the program stored in the ROM 67.

[0134] [Time Information Correction Department]

[0135] The time information correction unit 610 controls the receiving control unit 640 to perform the processing of receiving time information and updating the internal time, as well as the processing of correcting the internal time when the time has been corrected manually through the crown 6.

[0136] For example, when receiving time information and obtaining UTC, the time information correction unit 610 updates the internal time counted by the RTC 66 using the obtained UTC. Additionally, if the first time difference information is also obtained when receiving time information, the time information correction unit 610 updates the first time difference information stored in the storage unit 68 using the obtained time difference information.

[0137] Furthermore, when the crown 6 is pulled out to the first position and rotated, the time information correction unit 610 updates the internal time recorded by the RTC 66 according to the amount of rotation of the crown 6, correcting the time indicated by the pointer 3 of the basic clock. Additionally, when the crown 6 is pulled out to the second position and rotated, the time information correction unit 610 updates the second time difference information stored in the storage unit 68 according to the amount of rotation of the crown 6, correcting the time indicated by the pointers 791 and 792 of the small clock.

[0138] [Display Control Department]

[0139] In normal mode, the display control unit 620 controls the drive circuit 62 based on the internal time of the RTC 66 and the time difference information stored in the storage unit 68, using pointer 3 to display the time (hour, minute, second) of the basic clock and using pointers 791 and 792 to display the time (hour, minute) of the small clock.

[0140] Basic clocks typically display the local time, which is the time at your current location. Smaller clocks typically display the time at your place of residence, i.e., your hometown time.

[0141] When the display control unit 620 updates the internal time and first time difference information of the RTC 66 via the time information correction unit 610, it corrects the time indicated by the pointer 3 of the basic clock. Furthermore, when the time information correction unit 610 updates the second time difference information, the display control unit 620 corrects the time indicated by the pointers 791 and 792 of the small clock.

[0142] Therefore, the time correction unit, which corrects the display time based on the time information obtained in the receiving process, is composed of a time information correction unit 610 and a display control unit 620.

[0143] In addition, the display control unit 620 controls the display of pointers 781 based on factors such as battery level and receiver control status.

[0144] [Voltage Detection and Control Department]

[0145] The voltage detection control unit 630 detects the voltage (i.e., the stored capacity) of the secondary battery 24 and the power generation of the solar panel 22 via the voltage detection circuit 74. The voltage detection control unit 630 detects the voltage via the voltage detection circuit 74 at regular time intervals. The voltage detection control unit 630 also controls the operation of the charging control circuit 71.

[0146] [Receiving Control Department]

[0147] The receiving control unit 640 includes a receiving mode selection unit 641, a satellite signal receiving control unit 642, a short-range wireless communication control unit 645, and a receiving determination unit 646.

[0148] [Receiver Mode Selection Unit]

[0149] The receiving mode selection unit 641 detects the prescribed operations performed by the A button 7A and B button 7B, which are operation units, and thereby performs various receiving processes.

[0150] Specifically, when a timing reception operation is performed via the operation unit, the reception mode selection unit 641 selects the timing mode and starts the timing reception control unit 643 (described later). When a positioning reception operation is performed via the operation unit, the reception mode selection unit 641 selects the positioning mode and starts the positioning reception control unit 644 (described later).

[0151] Furthermore, when short-range wireless communication operation is performed via the operation unit, the receiving mode selection unit 641 selects the short-range wireless communication mode and activates the short-range wireless communication control unit 645, which will be described later.

[0152] The specific timing reception operation, positioning reception operation, and short-range wireless communication operation can be set according to the number and type of operation units provided in the radio wave correction clock 1. For example, operation A, which specifies pressing button A 7A for less than 3 seconds, is an example of timing reception operation; operation B, which specifies pressing button A 7A for more than 3 seconds, is an example of positioning reception operation; and operation C, which specifies pressing button B 7B for more than 3 seconds, is an example of short-range wireless communication operation.

[0153] Furthermore, as described later, when it is determined that the automatic reception conditions are met, the reception mode selection unit 641 activates the timing reception control unit 643.

[0154] Therefore, the receiving control unit 640 selectively activates the timing receiving control unit 643, the positioning receiving control unit 644, and the near-field wireless communication control unit 645 to selectively control each receiving process.

[0155] [Satellite Signal Reception and Control Department]

[0156] The satellite signal receiving control unit 642 includes a timing receiving control unit 643 and a positioning receiving control unit 644.

[0157] The timing reception control unit 643 activates the GPS receiving module 50, captures at least one location information satellite S and receives satellite signals, obtains the first time information from the received satellite signals, and performs timing reception processing to correct the internal time. Specifically, the timing reception control unit 643 obtains UTC as the first time information and uses the obtained UTC to update the internal time time kept by RTC 66.

[0158] The positioning and receiving control unit 644 activates the GPS receiving module 50, captures multiple location information satellites S and receives satellite signals, performs positioning based on the received multiple satellite signals, and performs positioning and receiving processing to correct the internal time based on the time information obtained based on the positioning results.

[0159] Specifically, the positioning receiving control unit 644 acquires the UTC and the first time difference information as the first time information, updates the internal time time kept by the RTC 66 using the acquired UTC, and stores the acquired first time difference information in the storage unit 68.

[0160] [Short-Range Wireless Communication Control Unit]

[0161] The short-range wireless communication control unit 645 activates the short-range wireless communication module 150 to conduct BLE-based short-range wireless communication (BLE communication) with the portable device 100 near the radio wave correction clock 1. Through this short-range wireless communication, time information is obtained and the internal time is corrected. Specifically, the short-range wireless communication control unit 645 obtains UTC and first time difference information as second time information, updates the internal time kept by the RTC 66 using the obtained UTC, and stores the obtained first time difference information in the storage unit 68.

[0162] [Receiving and Judgment Department]

[0163] The receiving determination unit 646 has the function of determining whether the reception of the time information was successful.

[0164] If the received time information is, for example, "25 o'clock" or "70 minutes", which is not available as time information, the receiving determination unit 646 determines that the reception of time information has failed.

[0165] If the received time information is possible, the receiving determination unit 646 compares it with the internal time kept by the RTC 66. For example, if the Z count, which serves as satellite time information, is obtained from a satellite signal, the receiving determination unit 646 compares the time after correcting the Z count using leap seconds at the current time point with the internal time of the RTC 66. Furthermore, if time information is obtained via short-range wireless communication, the receiving determination unit 646 compares the obtained time information with the internal time of the RTC 66.

[0166] If the difference between the time information obtained through reception and the internal time of RTC 66 is small, the reception determination unit 646 determines that the time information has been successfully received.

[0167] When the difference is large, the receiving determination unit 646 performs a matching determination based on the received time information. For example, when a satellite signal is received, the Z counts of multiple subframes are acquired, and the Z counts of the two are compared. If multiple position information satellites S are captured, the Z counts acquired from the multiple position information satellites S are compared to determine whether the acquired time information matches. When time information is acquired via short-range wireless communication, multiple time information sets are also acquired and compared to determine whether the acquired time information matches.

[0168] If the receiving determination unit 646 determines that a time information match has been obtained, the time information correction unit 610 performs time correction.

[0169] [Pre-set smartphone settings]

[0170] An application for communicating with the radio-corrected clock 1 is pre-installed in the portable device 100.

[0171] Next, pairing is performed for the initial setup of BLE communication between the radio-controlled clock 1 and the portable device 100. Specifically, when the Bluetooth setting of the radio-controlled clock 1 is set to connected, the application installed on the radio-controlled clock 1 is launched, and the connection preparation menu is selected, a message is displayed on the display 101 of the portable device 100. Figure 6 The pairing screen shown.

[0172] When the user touches the operation menu 102 displayed as "Pairing" on the display 101, the portable device 100 switches to the pairing state.

[0173] Then, when the user presses button B 7B of the radio-corrected clock 1 for more than 3 seconds as guided by display 101, the second hand 3B moves to the 30-second position, and the pointer 781, acting as an indicator hand, points to "BLE" in the second small window 780, thus performing pairing with the portable device 100. The pairing process is the same as the usual pairing between Bluetooth devices, so the description is omitted.

[0174] [Receiver control for electronic clocks]

[0175] Next, refer to Figure 7 The flowchart illustrates the control of the control unit 61 in the radio wave correction clock 1. Additionally, Figure 7 This indicates the controls in normal mode, which are not set to flight mode.

[0176] In this embodiment, the voltage detection circuit 74 is activated at certain intervals (e.g., 60-second intervals) under the control of the voltage detection control unit 630 to detect the battery voltage of the secondary battery 24.

[0177] The control unit 61 determines whether the remaining battery capacity, or stored capacity, of the secondary battery 24 detected by the voltage detection circuit 74 is above a predetermined value (step S1). Here, the voltage detection control unit 630 sets a voltage that will not cause a system malfunction in the control unit 61 even when performing GPS positioning reception processing and short-range wireless communication processing, as a predetermined value for comparison with the battery voltage of the secondary battery 24. For example, the predetermined value is 3.6V, which can be set according to the discharge characteristics of the secondary battery 24.

[0178] If the control unit 61 determines "yes" in step S1, it determines whether the prescribed operation C has been performed (step S2). The prescribed operation C is a short-range wireless communication operation, specifically, it is the same operation as during pairing, which is pressing button B 7B for more than 3 seconds.

[0179] If the control unit 61 determines "yes" in step S2, the short-range wireless communication control unit 645 is activated by the receiving mode selection unit 641 to start BLE communication processing (step S20). As a typical example of performing BLE communication processing, situations such as when a user wearing the radio-corrected clock 1 is indoors, or when it is difficult to receive GPS satellite signals and time information is needed, can be cited.

[0180] If the control unit 61 determines "no" in step S2, it then determines whether the prescribed operation B has been performed (step S3). The prescribed operation B is a positioning and receiving operation, specifically, pressing button A 7A for more than 3 seconds.

[0181] If the control unit 61 determines "yes" in step S3, the positioning and receiving control unit 644 is activated by the receiving mode selection unit 641 to start the GPS positioning and receiving process (step S40).

[0182] If the control unit 61 determines "no" in step S1 and "no" in step S3, it determines whether the automatic reception condition is met (step S4). Here, the automatic reception condition in this embodiment is the arrival of a preset timed reception time.

[0183] If the control unit 61 determines "no" in step S4, it executes step S5 to determine whether the specified operation A has been performed. The specified operation A is a timing reception operation, specifically, pressing button A 7A for less than 3 seconds.

[0184] If the control unit 61 determines "yes" in step S4 and "yes" in step S5, the timing reception control unit 643 is activated by the reception mode selection unit 641 to start GPS timing reception processing (step S30).

[0185] If the control unit 61 determines "no" in step S5, that is, if the automatic receiving conditions are not met and no operation A to C is performed, the normal needle movement of the control unit 620 continues to be displayed (step S10).

[0186] The control unit 61 repeatedly performs the above process at specified time intervals.

[0187] [BLE Communication Processing]

[0188] Next, refer to Figure 8 The flowchart illustrates the BLE communication processing in step S20.

[0189] When the near-field wireless communication control unit 645 is activated, the display control unit 620 uses pointer 781 to indicate that it is in BLE communication (step S201). Specifically, pointer 781 indicates the "BLE" character portion of the second small window 780.

[0190] Next, the near-field wireless communication control unit 645 begins the process of establishing a BLE link between the near-field wireless communication module 150 and the portable device 100 (step S202).

[0191] Next, the near-field wireless communication control unit 645 determines whether a BLE link has been established (step S211).

[0192] If the determination result is "no", the near-field wireless communication control unit 645 determines whether the prescribed timeout period has elapsed (step S240).

[0193] If the judgment result is "no", the near-field wireless communication control unit 645 repeatedly performs the judgment in step S211.

[0194] If the timeout period has elapsed without establishing a BLE link, the result of the judgment in step S240 is "yes".

[0195] In this case, the near-field wireless communication control unit 645 terminates communication (step S231).

[0196] Therefore, the control unit 61 returns the needle to normal needle movement (step S232).

[0197] Then, the processing of the control unit 61 returns to Figure 7 Step S1.

[0198] If a BLE link is established before the timeout period, the result of step S211 is "yes", and the near-field wireless communication control unit 645 obtains time information from the nearby portable device 100 through the near-field wireless communication module 150 (step S212). This time information is the time difference between UTC and the current location, and is an example of the second time information.

[0199] Next, the receiving and determining unit 646 determines whether the time information obtained from the portable device 100 has a matching relationship (step S213).

[0200] Specifically, as described above, the receiving and determining unit 646 compares the UTC of the acquired time information with the internal time of the RTC66 of the control unit 61, and confirms whether a match has been achieved based on whether the difference is within a specified value.

[0201] If the determination result in step S213 is "no", the near-field wireless communication control unit 645 terminates communication (step S231). As a result, the control unit 61 returns the needle movement to normal needle movement (step S232). Then, the processing of the control unit 61 returns to... Figure 7 Step S1.

[0202] Alternatively, if the determination in step S213 is "no", the near-field wireless communication control unit 645 may notify the portable device 100 of a mismatch. Alternatively, if the portable device 100 is notified of a time information mismatch, it may display a confirmation button on the display 101 indicating whether the internal time of the radio wave correction clock 1 can be updated using the time information from the portable device 100 due to the mismatch. If the user presses the button, the process proceeds to step S214, which will be described later.

[0203] If the judgment result in step S213 is "yes", the time information correction unit 610 corrects the internal time and first time difference information of the RTC 66 of the control unit 61 according to the time information obtained from the portable device 100, and the display control unit 620 corrects the display time indicated by the pointer 3 according to the corrected internal time and first time difference information (step S214).

[0204] Next, the near-field wireless communication control unit 645 determines whether it has received a data update instruction such as a time difference database from the portable device 100 (step S221).

[0205] In this embodiment, when a user wishes to rewrite the built-in data in the flash memory 54 of the radio wave correction clock 1, the user launches the data rewriting application installed in the portable device 100, sends a data update instruction from the portable device 100 to the radio wave correction clock 1, and sends data such as the time difference database that has been downloaded to the portable device 100 in advance to the radio wave correction clock 1.

[0206] In step S221, it is determined whether a data update instruction has been received from the portable device 100.

[0207] If the determination result in step S221 is "no", the receiving determination unit 646 determines whether a communication end instruction has been received from the portable device 100 (step S224).

[0208] If the judgment result in step S224 is "no", the receiving judgment unit 646 repeats the judgment in step S221.

[0209] When the determination result of step S221 is "yes" after receiving a data update instruction from the portable device 100, the near-field wireless communication control unit 645 receives data such as time difference database from the portable device 100 through the near-field wireless communication module 150 (step S222), and uses the received data to rewrite the data in the flash memory 54 of the GPS receiver module 50 (step S223).

[0210] Then, the receiving determination unit 646 determines whether a communication end instruction has been received from the portable device 100 (step S224).

[0211] Furthermore, when a communication termination instruction is received from the portable device 100, the determination result of step S224 is "yes".

[0212] Therefore, the control unit 61 terminates the communication (step S231) and returns the needle to normal needle movement (step S232).

[0213] Then, the processing of the control unit 61 returns to Figure 7 Step S1.

[0214] In addition, in short-range wireless communication processing, besides time information and time difference databases, the application of the portable device 100 can be used to update time zone information and daylight saving time information, which serve as time difference information, and obtain auxiliary data.

[0215] For example, when changing the time zone information of the main clock or the small clock, such as Figure 9 As shown, a time zone correction screen 110 is displayed on the monitor 101 via an application on the portable device 100. The time zone correction screen 110 displays a basic clock correction screen 111 that corrects the time zone, date, and time of the basic clock indicated by pointer 3, and a small clock correction screen 112 that corrects the time zone, date, and time of the small clocks indicated by pointers 791 and 792. When the user clicks on screens 111 and 112 and slides them up or down, the time zone is changed, and the date and time are changed accordingly.

[0216] Then, when button 113, which displays "Send settings to clock", is pressed, the time zone information of each screen 111 and 112 is sent to radio wave correction clock 1, which can change the time zone of the basic clock and the small clock, namely the first time difference information and the second time difference information.

[0217] [Time Measurement Reception Processing]

[0218] Next, refer to Figure 10 The flowchart below illustrates step S30 of the GPS timing reception processing. Hereinafter, the GPS timing reception processing will be referred to simply as timing reception processing.

[0219] The timing reception control unit 643 of the control unit 61 controls the GPS receiver module 50 to perform timing reception processing.

[0220] When the timing reception control unit 643 starts the timing reception process, it first uses pointer 781 to indicate "1" to show that it is in timing mode, and then starts the GPS receiver module 50 to start time reception (step S301).

[0221] Next, the timing receiver control unit 643 starts satellite search via the GPS receiver module 50 (step S302).

[0222] Then, the timing receiver control unit 643 determines whether the GPS receiver module 50 has acquired the satellite (step S311).

[0223] If the judgment result is "no", the timing reception control unit 643 determines whether the elapsed time since the start of timing reception has reached the specified timeout time (e.g., 15 seconds) for satellite capture (step S351).

[0224] If the judgment result of step S351 is "yes" due to timeout, the timing receiving control unit 643 ends the reception of GPS receiving module 50 (step S342).

[0225] Therefore, the control unit 61 sets the pointer 781 to display the remaining battery level and returns it to normal pointer movement (step S334).

[0226] In addition, the frequency of GPS satellite signals is a high frequency of about 1.5 GHz, which is not affected by motor noise. Therefore, in this embodiment, the pointer 3 continues to move while receiving satellite signals, but the movement can also be stopped.

[0227] On the other hand, if the timeout does not occur when transitioning from step S311 to step S351 and the judgment result of step S351 is "no", the timing receiving control unit 643 continues the satellite search processing of the GPS receiving module 50 (step S302).

[0228] When proceeding from step S302 to step S311, if it is confirmed that a satellite has been captured and the judgment result of step S311 is "yes", the timing receiving control unit 643 stores the satellite data related to the location information satellite S captured by the GPS receiving module 50 into the flash memory 54 (step S312).

[0229] In this flash memory 54, satellite data captured during past receptions is stored along with information indicating the reception time period.

[0230] Then, when a new satellite with different location information S than the satellite data stored in the GPS receiver module 50 is captured during the same time period as the satellite data stored in the flash memory 54, the timing receiver control unit 643 updates the satellite data in the flash memory 54 for the same time period using the newly captured satellite data in step S312.

[0231] The satellite data stored in flash memory 54 is used during the satellite search in step S302.

[0232] That is, location information satellites (such as GPS satellites) typically orbit the Earth once every approximately 12 hours. Since the Earth also rotates, if you search for location information satellites in the same location and at the same time, such as 24 hours later, there is a high probability that you will be able to capture the same location information satellite as you captured in the past (such as the last time).

[0233] Therefore, during satellite search in step S302, if there is satellite data captured in the same time period in flash memory 54, prioritizing the search for that satellite can increase the probability of capturing the location information satellite S in a short time.

[0234] Therefore, when the timing receiving control unit 643 searches for satellites in step S302, it refers to the satellite data stored in the flash memory 54. If satellite data for the same time period is stored, it prioritizes searching for that satellite. If no satellite data is stored, it searches for the location information satellite S in a predetermined order.

[0235] When the storage of satellite data to flash memory 54 is completed (step S312), the timing receiving control unit 643 determines whether time information has been obtained from the satellite captured by the GPS receiving module 50 (step S321). That is, it determines whether the Z count has been obtained as time information.

[0236] In addition, when multiple satellites have been captured, time information can be obtained from satellite signals with high signal strength (SNR), or time information can be obtained from multiple satellites separately. The success of the time information can be judged by confirming the matching of the time information.

[0237] If the determination result of step S321 is "no", the timing receiving control unit 643 determines whether the elapsed time since the process entered step S321 from step S312 has reached the specified timeout period (e.g., 60 seconds) (step S341).

[0238] If the judgment result of step S341 is "no", the timing receiving control unit 643 repeats the processing of step S321.

[0239] In GPS satellite signals, Z counts can be received at 6-second intervals. Therefore, if the timeout period in step S341 is 60 seconds, a maximum of 10 Z counts can be received before the timeout.

[0240] When the elapsed time exceeds the timeout period and the judgment result of step S341 is "yes", the GPS receiving module 50 ends the receiving process (step S342). It then returns to normal needle movement (step 334).

[0241] On the other hand, when proceeding to step S321, if time data can be obtained at that time point, the judgment result of step S321 is "yes", and the timing receiving control unit 643 confirms the matching of the obtained time information (step S322).

[0242] Specifically, when the timing receiving control unit 643 obtains the initial Z count, it compares the time after correcting the Z count using leap seconds with the internal time of the RTC 66 of the control unit 61, and confirms whether a match has been achieved based on whether the difference is within a specified value (step S322).

[0243] In step S322, if the difference in the comparison time is greater than a specified value, for example, if there is a difference of more than 5 seconds, it is determined that no match has been obtained.

[0244] Furthermore, if the result is "no" in step S322 due to the lack of matching, the timing receiving control unit 643 executes the processing after step S341.

[0245] Therefore, if the acquired time information does not match the internal time, the timing receiving control unit 643 acquires the Z count of the subframe 6 seconds later.

[0246] On the other hand, when the timing receiving control unit 643 acquires multiple Z counts and these multiple Z counts match each other, that is, when it becomes data with a 6-second interval, since the acquired Z counts have matched, it is determined to be "yes" in step S322.

[0247] If the timing receiving control unit 643 determines "yes" in step S322, it ends the receiving (step S331).

[0248] Next, the time information correction unit 610 corrects the internal time based on the acquired time information, and the display control unit 620 corrects the display time indicated by the pointer 3 based on the corrected internal time and the first time information stored in the storage unit 68 (step S332).

[0249] After the time information correction unit 610 corrects the internal time, the display control unit 620 corrects the display of pointer 3 via the drive circuit 62 according to the corrected internal time, and pointer 781 also returns to the battery balance display and returns to normal hand movement (step S334).

[0250] After the above steps, the timing reception processing is complete.

[0251] When the timing reception process ends, the control unit 61 returns. Figure 7 Step S1 continues the processing.

[0252] In timing reception processing, time information can be obtained in about 5 to 15 seconds. It only needs to capture one satellite, so it saves power and has excellent reception sensitivity.

[0253] [GPS Positioning Reception and Processing]

[0254] The GPS positioning and receiving process in step S40 is identical to the GPS timing and receiving process in step S30, except that it involves capturing at least three satellites (usually four) and obtaining satellite orbit data for positioning calculations. Therefore, its description is omitted. Furthermore, in the GPS positioning and receiving process, the location information of the place where positioning calculations and receiving processes have been performed can be obtained. Therefore, based on the obtained location information and the time difference database stored in flash memory 54, the time difference information of the current location can be obtained, and the time difference information related to local time can be corrected.

[0255] Furthermore, timing reception processing only needs to receive Z-counts as time information from a single satellite, so it can be received even in environments with limited open space, such as buildings, streets, or indoors, as long as it's near a window. Moreover, since it only receives Z-counts and not satellite orbit data, the reception time is short, resulting in a higher success rate compared to positioning reception processing. However, because it doesn't perform positioning calculations, automatic time zone correction cannot be performed in timing reception processing.

[0256] On the other hand, positioning processing requires receiving satellite orbit data from at least three satellites, typically taking more than 30 seconds. If not in an open outdoor environment, the success rate is low. Therefore, positioning processing is not suitable for automatic reception but rather for manual reception initiated by the user.

[0257] [Receiver control in flight mode]

[0258] When flight mode is activated, control unit 61 does not perform automatic reception. That is, reception control in flight mode is relative to... Figure 7 The reception control shown in the normal mode differs only in that the decision processing in step S4 is not performed. Therefore, the description of the reception control in flight mode is omitted.

[0259] [Effects of the First Embodiment]

[0260] The radio wave correction clock 1 of this embodiment includes: a receiving unit R1 that receives satellite radio waves containing time information; a near-field receiving unit R2 that receives radio waves containing time information transmitted from a portable device 100; an operation unit with buttons A 7A and B 7B for receiving instruction operations; a receiving control unit 640 that activates the receiving unit to perform a first receiving process when a preset time is reached, and activates the near-field receiving unit to perform a second receiving process according to an instruction operation from the operation unit, selectively controlling the first receiving process and the second receiving process; and a time information correction unit 610 and a display control unit 620 that correct the displayed time based on the time information obtained in the first receiving process or the time information obtained in the second receiving process.

[0261] Therefore, the automatic time correction performed daily is carried out through the first reception process, namely GPS time measurement reception, which is executed at a preset time. On the other hand, when the user presses button B 7B to make an instruction operation, the second reception process, namely BLE communication, is executed.

[0262] BLE communication processing requires the portable device 100's application to be launched in advance. In the case of BLE communication processing for the purpose of daily time correction, the user needs to launch the application every time, which makes the operation cumbersome for the user.

[0263] In addition, when the application on the portable device 100 is continuously running, a portion of the internal memory of the portable device 100 is occupied, and the battery is also consumed.

[0264] In contrast, in this embodiment, the daily timed reception is GPS timing reception processing, and the BLE communication processing only needs to be performed when the user needs to operate, which can prevent the operation from becoming complicated for the user, and can also prevent the memory occupation and battery consumption of the portable device 100.

[0265] Because the first receiving process is executed automatically at a preset time, the radio-corrected clock 1 can continuously display the accurate time worldwide even without any user operation. In particular, since users typically stay in the same area without time zone changes, the radio-corrected clock 1 can automatically be aligned to the accurate time and also suppress power consumption by automatically performing GPS time receiving processing every day, which consumes less power than BLE communication.

[0266] In addition, under normal circumstances, since the radio-controlled clock 1 does not cooperate with the portable device 100, there is no trouble of launching a dedicated application on the portable device 100, and user dissatisfaction such as the inability to connect to the portable device 100 can be minimized.

[0267] If the user operates the operating unit to perform the second receiving process, the time zone can be corrected even indoors where GPS satellite signals cannot reach, allowing the clock to be accurately timed to the current location. For example, when a user travels across time zones by plane, the radio-corrected clock 1 can connect to the portable device 100 via short-range wireless operation, even inside an airport building, and obtain time information from the portable device 100 to display the local time, thus quickly correcting to the local time.

[0268] [Second Implementation]

[0269] The processing during flight mode execution in the second embodiment differs from that in the first embodiment. That is, in the normal mode where flight mode is not executed, the same procedures as in the first embodiment are followed. Figure 7 The processing is therefore omitted. On the other hand, when flight mode is activated, the following steps are performed: Figure 11 The flight mode processing S401 is shown.

[0270] The following is for reference Figure 11 The processing S401 for a flight mode different from the first embodiment is explained. Additionally, in... Figure 11 In the middle, to and Figure 7 The same processing methods in the flowcharts are labeled with the same numbers and the descriptions are omitted.

[0271] The control unit 61 of the radio wave correction clock 1 executes flight mode. When it is determined to be "yes" in step S1 of determining whether the stored power is above a specified value, it determines whether there is a flight mode deactivation operation (step S402).

[0272] To switch to Airplane Mode, for example, pull the crown 6 out to level 1 and press and hold button B 7B for more than 3 seconds. The procedure to de-air Airplane Mode is the same.

[0273] When a flight mode cancellation operation is performed and the result is determined to be "yes" in step S402, the control unit 61 cancels the flight mode (step S403) and activates the near-field wireless communication control unit 645 to perform BLE communication processing (step S20).

[0274] If there is no flight mode deactivation operation and the result is "No" in step S402, the control unit 61 executes the processing after step S2. The processing of steps S2, S3, S5, S10, S30, and S40 is similar to... Figure 7 The first embodiment shown is the same, so the description is omitted.

[0275] If the control unit 61 determines "no" in step S1, it determines whether a flight mode deactivation operation exists (step S404).

[0276] When a flight mode cancellation operation is performed and the result is "yes" in step S404, the control unit 61 cancels the flight mode (step S405). At this time, the result is "no" in step S1, the charge of the secondary battery 24 is less than the specified value, so the BLE communication processing in step S20 is not executed, and control returns to the normal mode.

[0277] In addition, if the control unit 61 determines "no" in step S404, it will execute the processing after step S5.

[0278] In addition, the portable device 100 can also set and de-set a communication prohibition mode that prohibits communication with other devices based on the operation of the second operation unit provided in the portable device 100.

[0279] Alternatively, the second operation unit can be implemented by buttons or the like that are displayed on the display 101 of the portable device 100 and can be input by touch.

[0280] Alternatively, the system can be configured such that, after the communication prohibition mode is set, the application for BLE communication with the radio-controlled clock 1 is automatically launched after a certain period when the communication prohibition mode is lifted. Alternatively, the user can initiate the operation of launching the application for BLE communication with the radio-controlled clock 1 after the communication prohibition mode is lifted.

[0281] [Effects of the second embodiment]

[0282] According to the second embodiment, when the aircraft moves to a region with a different time zone, BLE communication processing can be automatically initiated by deactivating flight mode. Therefore, compared to the situation where the deactivation of flight mode and the initiation of BLE communication processing must be performed separately during aircraft landing, time zone operation becomes simpler and operability is improved.

[0283] In addition, the portable device 100, such as a smartphone, also performs the operation to release the communication prohibition mode when the aircraft lands. Therefore, if the launch of the application on the portable device 100 is also automatically performed in conjunction with the operation to release the communication prohibition mode of the portable device 100, the operability can be further improved.

[0284] That is, by deactivating the flight mode of the radio wave correction clock 1 and the portable device 100 after the plane lands, the user can immediately correct the time to the local time upon arrival at the airport.

[0285] [Other Implementation Methods]

[0286] Furthermore, the present invention is not limited to the above-described embodiments; the present invention includes modifications and improvements within the scope of achieving the objectives of the present invention.

[0287] For example, the time information sent from the portable device 100 in BLE communication processing is not limited to UTC and time difference information; it can be just time difference information or local time information. In short, the portable device 100 only needs to send information that can correct the displayed time of the radio wave correction clock 1 to the local time obtained by the portable device 100 as the time information.

[0288] Furthermore, in each of the embodiments described, UTC is timed in RTC 66, but the local time, which reflects the local time difference in UTC, can also be timed in RTC 66. In this case, if UTC and time difference information are output from receiving unit R1 or near-field receiving unit R2, control unit 61 only needs to update RTC 66 with the local time reflecting the time difference information in UTC. Furthermore, if configured to output the local time from receiving unit R1 or near-field receiving unit R2, RTC 66 only needs to be updated with the output local time.

[0289] Furthermore, in the described embodiment, the automatic reception condition determined in step S4 during normal mode is considered to be met when a preset timed reception time is reached. However, a light reception condition can also be added, where the amount of light illuminating the solar cell panel 22 is above a threshold level. In this case, if time information cannot be obtained through GPS timing reception processing at the timed reception time, automatic reception based on the light reception condition is performed, provided that GPS timing reception processing is not performed more than twice a day.

[0290] Furthermore, when time information is obtained by performing GPS timing reception processing, GPS positioning reception processing, and BLE communication processing through specified operations A to C, it is also possible to control the process so that GPS timing reception processing is not performed within a specified time (e.g., 12 hours or 24 hours) from the date of successful reception, even if the automatic reception conditions are met.

[0291] That is, the receiving control unit 640 can execute the first receiving process regardless of whether the receiving process based on the prescribed operation is successful when the automatic receiving conditions are met, or it can control the process so that the first receiving process is not executed until a predetermined time has elapsed after the prescribed operation is successful, and the first receiving process is executed when the automatic receiving conditions are met after the predetermined time has elapsed.

[0292] Furthermore, in each of the embodiments, automatic reception is not performed in the flight mode of the radio wave correction clock 1; however, in addition to automatic reception, manual reception can also be disabled. That is, in flight mode, reception may not occur even if specified operations A to C are performed.

[0293] Furthermore, in the second embodiment, when the communication prohibition mode of the portable device 100 is deactivated, the application for BLE communication is automatically launched. However, the application may also be automatically launched when a certain operation is detected, such as when the time zone of the portable device 100 is manually corrected. In this case, when the user performs BLE communication processing in the radio wave correction clock 1, the operation of launching the application can be reduced, and internal time correction can be performed.

[0294] In the described embodiment, GPS satellites were used as an example of location information satellite S. However, other satellites such as Galileo, GLONASS, Beidou, and other Global Navigation Satellite Systems (GNSS), Geostationary Satellite Navigation Augmentation Systems (SBAS), Quasi-Zenith Satellite Systems (RNSS) and other satellites that can only be retrieved in specific regions can also be used as location information satellite S.

[0295] In addition, the proximity receiver is not limited to receiving BLE radio waves, but can also receive other radio waves such as NFC.

[0296] In the described embodiment, GPS positioning and reception processing is performed to correct the time difference information. However, GPS positioning and reception processing may not be performed, and the time difference information may be automatically corrected solely through BLE communication processing.

[0297] [Summarize]

[0298] The radio-corrected clock disclosed herein is characterized by comprising: a receiving unit that receives satellite radio waves containing first time information; a near-field receiving unit that receives radio waves containing second time information transmitted from a portable device; an operation unit that receives instruction operations; a receiving control unit that selectively executes a first receiving process that activates the receiving unit to acquire the first time information when a preset time is reached, and a second receiving process that activates the near-field receiving unit to acquire the second time information according to an instruction operation from the operation unit; and a time correction unit that corrects the displayed time based on the first time information acquired in the first receiving process or the second time information acquired in the second receiving process.

[0299] The daily automatic time correction is performed by the receiving unit, which receives satellite radio waves, and is executed at a preset time as the first reception process. On the other hand, when the user gives instructions through the operation unit, the second reception process is performed by the near-field receiving unit.

[0300] The radio wave reception processing of the near-field receiver requires the portable device's application to be launched beforehand. Therefore, when performing a second reception process for daily time correction, the user needs to launch the application each time, which becomes cumbersome. Furthermore, continuously launching the portable device's application consumes a portion of the portable device's internal memory and drains the battery.

[0301] According to the radio wave correction clock disclosed herein, since the daily timed reception is the first reception processing of the receiving unit and the second reception processing of the near-field receiving unit is performed when the user has given an instruction, the startup operation of the portable device's application can be minimized, thus preventing the operation from becoming complicated for the user and also preventing the portable device's memory from being occupied and the battery from being consumed.

[0302] In the radio wave correction clock disclosed herein, the receiving control unit performs the second receiving process only according to the instructions from the operating unit.

[0303] Since the second reception process is not performed even if the automatic reception conditions are met, the startup operation of the portable device's application can be kept to a minimum, which can prevent the operation from becoming complicated for the user and also prevent the portable device's memory usage and battery consumption.

[0304] In the radio wave correction clock disclosed herein, there is a light sensor that detects whether the amount of light irradiated is above a threshold level. When the light sensor detects that the amount of light is above the threshold level, the receiving control unit causes the first receiving process of the receiving unit to operate.

[0305] In addition to the case where the preset time is reached, the receiving control unit also activates the first receiving process when the light level detected by the light sensor is above the threshold level, thus increasing the probability of successful first receiving process for receiving satellite radio waves.

[0306] In the radio-corrected clock of this disclosure, the proximity receiver communicates wirelessly with the portable device via Bluetooth or NFC.

[0307] Since Bluetooth or NFC are features commonly found in portable devices such as smartphones, there is no need to prepare special portable devices, which improves convenience.

[0308] In the radio wave correction clock disclosed herein, there is a battery that stores electricity. The receiving control unit can perform the second receiving process when the battery's stored power is above a predetermined value, not perform the second receiving process when the battery's stored power is below the predetermined value, and perform the first receiving process when the battery's stored power is below the predetermined value.

[0309] In the radio wave correction clock disclosed herein, the receiving control unit has an automatic receiving prohibition mode, which is set by the operation of the operation unit. In this automatic receiving prohibition mode, the first receiving process is not performed even when the preset time is reached. The instruction operation from the operation unit includes the operation of releasing the automatic receiving prohibition mode. When the automatic receiving prohibition mode is released by the operation of the operation unit, the receiving control unit performs the second receiving process.

[0310] When the receiving prohibition mode is lifted by operating the clock's control unit via radio wave correction, the receiving control unit begins the second receiving process. Therefore, by simply lifting the automatic receiving prohibition mode after the aircraft lands, such as by lifting the flight mode, the second receiving process can be performed and the time updated to the local time, thus improving convenience.

[0311] In the radio wave correction clock disclosed herein, there is a battery that stores power, and the receiving control unit has an automatic receiving prohibition mode. This automatic receiving prohibition mode is set by the operation of the operation unit. In this automatic receiving prohibition mode, the first receiving process is not performed even when the preset time is reached. The instruction operation from the operation unit includes the operation of deactivating the automatic receiving prohibition mode. When the automatic receiving prohibition mode is deactivated by the operation of the operation unit and the battery's stored power is above a predetermined value, the receiving control unit performs the second receiving process.

[0312] The system disclosed herein is a system having the radio-controlled clock and the portable device, characterized in that the portable device has a second operation unit, and is set to a communication prohibition mode by operation of the second operation unit, which prohibits communication with other devices, and when the communication prohibition mode is lifted by operation of the second operation unit, it begins to communicate with the radio-controlled clock.

[0313] According to the system disclosed herein, when the communication prohibition mode is lifted by the operation of the second operation unit of the portable device, the function of communicating with the radio wave correction clock is started. Therefore, by simply lifting the communication prohibition mode of the portable device after the aircraft lands, it is possible to switch to a state where communication with the radio wave correction clock is possible, without the need for additional operation to perform the communication function, thus improving convenience.

[0314] In the system disclosed herein, when the communication prohibition mode is lifted by the operation of the second operation unit, the portable device automatically launches an application program to communicate with the radio wave correction clock.

[0315] The control method for a radio-controlled clock disclosed herein comprises: a receiving unit that receives satellite radio waves containing first time information; a near-field receiving unit that receives radio waves containing second time information transmitted from a portable device; and an operation unit that accepts instruction operations. The control method is characterized in that, upon reaching a predetermined time, a first reception process based on the receiving unit is executed; a second reception process based on the near-field receiving unit is executed according to the instruction operation from the operation unit; and the displayed time is corrected based on the first time information obtained in the first reception process or the second time information obtained in the second reception process.

[0316] According to the control method of the radio wave correction clock disclosed herein, since the daily timed reception is the first reception processing of the receiving unit and the second reception processing of the near-field receiving unit is performed when the user performs an instruction operation, it is also possible to make the application startup operation of the portable device as minimal as necessary, prevent the operation from becoming complicated for the user, and also prevent the portable device's memory occupation and battery consumption.

Claims

1. A radio-controlled clock, characterized in that, have: A battery that stores electrical energy; The receiving unit receives satellite radio waves containing information from the first moment. A near-field receiver that receives radio waves containing second-time information transmitted from a portable device; The operations department is responsible for receiving and processing instructions. The receiving control unit selectively performs a first receiving process that activates the receiving unit to acquire the first time information when a preset time is reached, and a second receiving process that activates the near-field receiving unit to acquire the second time information according to an instruction from the operation unit. as well as The time correction unit corrects the display time based on the first time information obtained in the first receiving process or the second time information obtained in the second receiving process. The receiving control unit has an automatic receiving prohibition mode, which is set by the operation of the operation unit. In this automatic receiving prohibition mode, the first receiving process will not be executed even if the preset time is reached. The instruction operation from the operation unit includes the operation of deactivating the automatic reception prohibition mode. When the automatic reception prohibition mode is deactivated by the operation unit and the battery charge is above a predetermined value, the reception control unit performs the second reception process.

2. The radio-controlled clock according to claim 1, characterized in that, The receiving control unit performs the second receiving process only according to the instructions from the operating unit.

3. The radio-controlled clock according to claim 1, characterized in that, This radio-controlled clock has a light sensor that detects whether the amount of light emitted is above a threshold level. When the light level detected by the light sensor is above the threshold level, the receiving control unit activates the first receiving process of the receiving unit.

4. The radio-controlled clock according to claim 1, characterized in that, The near-field receiver communicates wirelessly with the portable device via Bluetooth or NFC.

5. The radio-controlled clock according to claim 1, characterized in that, The receiving control unit can perform the first receiving process when the battery's charge level is less than a predetermined value.

6. A system comprising the radio-controlled clock of claim 1 and the portable device, characterized in that, The portable device has a second operation unit, which can be set to a communication prohibition mode that prevents communication with other devices by operating the second operation unit. When the communication prohibition mode is lifted by operating the second operation unit, the device can start communicating with the radio wave correction clock.

7. The system according to claim 6, characterized in that, When the communication prohibition mode is lifted by the operation of the second operation unit, the portable device automatically launches an application program to communicate with the radio wave correction clock.

8. A control method for a radio-controlled clock, the radio-controlled clock having: A battery that stores electrical energy; The receiving unit receives satellite radio waves containing information from the first moment. A proximity receiver that receives radio waves containing second-time information transmitted from a portable device; and The operations department receives and processes instructions. The characteristic of this radio-controlled clock control method is that... Upon reaching a preset time, the first receiving process based on the receiving unit is executed. According to the instructions from the operation unit, the second reception process based on the proximity receiver is performed. The display time is corrected based on the first time information obtained in the first receiving process or the second time information obtained in the second receiving process. The automatic reception disable mode is set by operating the operation unit. In the automatic reception disable mode, the first reception process will not be performed even if the preset time is reached. The instruction operation from the operation unit includes the operation of deactivating the automatic reception prohibition mode. When the automatic reception prohibition mode is deactivated by the operation of the operation unit and the battery charge is above a predetermined value, the second reception process is performed.

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