JP6274459B2 - Electronic watch - Google Patents

Description

  The present invention relates to an electronic timepiece having a function of receiving microwaves using power generated by photovoltaic power as a power source.

  In recent years, electronic watches that receive microwaves and acquire information superimposed on the microwaves have been developed. For example, an artificial satellite (GPS satellite) orbiting the orbit over the earth transmits a microwave on which time information and orbit information are superimposed, and a ground receiver (GPS receiver) receives the microwave and receives its own microwave. A wristwatch that acquires a current position, date, accurate time, and the like using a GPS (Global Positioning System) system that measures a position has been developed. As such a wristwatch, for example, wristwatches described in Patent Literature 1 and Patent Literature 2 have been proposed.

JP 2000-138607 A Japanese Patent No. 4404898

  However, in the wristwatch described in Patent Document 1 or Patent Document 2, the location where the antenna is stored is a protrusion that can be visually recognized from the outside. There is also a problem. Therefore, in these watches, for example, it is conceivable that the dial is made of a member that transmits microwaves, and the antenna is arranged on the back side of the dial to improve the decoration and wearability.

  On the other hand, in recent years, a watch-type radio timepiece has been developed that receives a standard radio wave of 40 kHz or 60 kHz using power generated by photovoltaic power generation of a solar cell as a power source. Generally, a solar cell is designed so that the area on which light is incident is as large as possible in order to increase the power generation efficiency. Therefore, for example, in a wristwatch-type radio timepiece equipped with a solar cell, the solar cell is arranged so that the surface of the solar cell faces almost the entire back surface of the dial in consideration of decoration and wearability. Therefore, if you place the antenna on the back side of the dial plate, you will receive the standard radio wave that passed through the solar cell, but the standard radio wave is a long wave and the frequency is low, so there is almost no shielding effect of the standard radio wave by the solar cell, There is no effect on the standard radio wave reception performance. However, in microwaves with high frequency, the shielding effect of solar cells is very strong and the reception performance deteriorates. Therefore, electronic watches that receive microwaves are equipped with solar cells and are also decorative and wearable. No attempt has been made to place an antenna on the back side of the dial to improve the performance.

  The present invention has been made in view of the problems as described above, and by arranging the solar cell and the antenna on the back side of the dial while maintaining the reliable reception of microwaves, the decoration and wearability are improved. The purpose is to provide a good electronic watch.

(1) The present invention is an electronic timepiece having a function of receiving microwaves using electric power generated by photovoltaic power generation as a power source, and a dial that displays time information on the surface, and light transmitted through the dial A solar cell that receives the light and generates the photovoltaic power, and an antenna that receives the microwaves that are disposed so that at least a part of the receiving surface faces at least a part of the back surface of the dial and transmits the dial The solar cell is not disposed in a space sandwiched between the back surface of the dial and the receiving surface of the antenna.

  The microwave is generally a radio wave having a wavelength of 100 μm to 1 m and a frequency of 300 MHz to 3 THz, and includes a decimeter wave (UHF), a centimeter wave (SHF), a millimeter wave (EHF), and a submillimeter wave. . For example, radio waves used for GPS, Bluetooth, and CDMA (Code Division Multiple Access) are microwaves. Therefore, the electronic timepiece of the present invention includes, for example, an electronic timepiece that performs reception and communication by GPS, Bluetooth, and CDMA (Code Division Multiple Access).

  The dial is preferably non-metallic in order to transmit microwaves. Further, since the dial plate also needs to transmit light, the base material may be a resin, and metal deposition having a thickness that does not attenuate the microwaves may be performed on the surface of the resin. Furthermore, the dial may display time information such as hours, minutes, seconds, etc. by analog time display combining the position of the pointers with letters, numbers, symbols, etc. formed on the surface. Alternatively, time information such as hours, minutes, and seconds may be displayed by digital time display.

  According to the electronic timepiece of the present invention, since the antenna is disposed inside the electronic timepiece on the back side of the dial, it is possible to provide an electronic timepiece having good decorativeness and wearability.

  Further, according to the electronic timepiece of the present invention, since the solar cell does not exist between the back surface of the dial and the receiving surface of the antenna, the microwave is not attenuated by the solar cell. Therefore, according to the electronic timepiece of the present invention, reliable reception can be maintained even if the solar cell is generating photovoltaic power during reception.

  (2) In the electronic timepiece of the invention, the solar cell may have an opening formed in a space sandwiched between the back surface of the dial and the receiving surface of the antenna.

  (3) In the electronic timepiece of the invention, the solar cell may be arranged such that at least a part of the light receiving surface faces at least a part of the back surface of the dial.

  (4) In the electronic timepiece of the invention, the light receiving surface of the solar cell and the receiving surface of the antenna may be arranged on substantially the same plane.

  According to the electronic timepiece of the invention, since the antenna can be disposed at a position closer to the dial, the radiation pattern of the antenna is widened and the reception performance can be improved.

  Moreover, according to the electronic timepiece of the present invention, the degree of freedom of arrangement of other timepiece components inside the wristwatch can be increased. Therefore, for example, if it arrange | positions so that there may be as little gap as possible between each timepiece component, an exterior case can be made thinner and weight reduction can be achieved.

  (5) The present invention is an electronic timepiece having a function of receiving microwaves using power generated by photovoltaic power generation as a power source, and a dial that displays time information on the surface and at least a part of the light receiving surface. A solar cell that is disposed so as to face at least a part of the back surface of the dial plate and receives the light transmitted through the dial plate to generate the photovoltaic power, and at least a part of a receiving surface of the solar cell receives the light. And an antenna that receives the microwave that has passed through the solar cell, and is arranged to face at least a part of the back surface of the surface, and the solar cell includes at least the back surface of the dial and the antenna. The portion sandwiched between the receiving surfaces is characterized in that no electrode is formed.

  Since the portion where the electrode of the solar cell is not formed has almost no microwave shielding effect as compared with the portion where the electrode is formed, there is no attenuation when the microwave passes through the solar cell. According to the electronic timepiece of the invention, the microwave that has passed through the portion where the electrode of the solar cell is not formed is received, so that reliable reception can be performed.

  (6) In the electronic timepiece of the invention, the distance between the antenna and the metal member included in the solar cell may be a predetermined value or more.

  As the distance between the antenna and the metal member included in the solar cell is shorter, the antenna and the metal member are electrically coupled to generate a loss. In addition, as the distance between the antenna and the metal member included in the solar cell is shorter, the radiation pattern of the antenna is blocked by the metal member and becomes smaller, and the reception performance of the antenna deteriorates. According to the electronic timepiece of the invention, since the distance between the antenna and the metal member included in the solar cell is a predetermined value or more, microwaves can be reliably received without deterioration in reception performance.

  (7) The present invention is an electronic timepiece having a function of receiving microwaves using power generated by photovoltaic power generation as a power source, and a dial plate for displaying time information on the surface and at least a part of the light receiving surface. A solar cell that is disposed so as to face at least a part of the back surface of the dial plate and receives the light transmitted through the dial plate to generate the photovoltaic power, and at least a part of a receiving surface of the solar cell receives the light. And an antenna that receives the microwave that has passed through the solar cell, and is arranged to face at least a part of the back surface of the surface, and the solar cell includes at least the back surface of the dial and the antenna. A portion of the electrode sandwiched between the receiving surfaces is formed in a mesh shape.

  All the electrodes of the solar cell may be formed in a mesh shape.

  In the electronic timepiece of the present invention, the electrode of the solar cell existing between the back surface of the dial and the receiving surface of the antenna is formed in a mesh shape, so that the surface area of the electrode can be reduced. Therefore, since the microwave shielding effect by the electrodes of the solar cell can be weakened, the microwaves can pass through the solar cell and be reliably received.

  In the electronic timepiece of the invention, it is also possible to arrange the solar cell so that the entire light receiving surface of the solar cell faces the entire back surface of the dial. If the solar cell is arranged in such a manner, even if the dial has low transmittance, the color of the solar cell can be seen from the outside over the entire dial, so that the decorativeness can be improved. .

  (8) The electronic timepiece of the invention includes a timepiece part at least partially formed of a metal member, and the timepiece part is arranged so that a distance between the antenna and the metal member is equal to or greater than a predetermined value. Good.

  As the distance between the antenna and the metal member is shorter, the antenna and the metal member are electrically coupled to generate a loss. Further, as the distance between the antenna and the metal member is shorter, the radiation pattern of the antenna is blocked by the metal member and becomes smaller, the radiation pattern of the antenna becomes smaller, and the reception performance of the antenna deteriorates. According to the electronic timepiece of the invention, since the antenna is arranged so that the distance from the metal member is a predetermined value or more, the reception performance of the antenna can be reliably received without deterioration.

  (9) The electronic timepiece of the invention may include an exterior case, a movement, and a back cover as the timepiece part.

  In the electronic timepiece of the invention, since the antenna is arranged so that the distance from the metal member constituting at least a part of the outer case, the movement, and the back cover is equal to or greater than a predetermined value, reliable reception can be achieved. .

  (10) In the electronic timepiece of the invention, the antenna may be a patch antenna (generally called a microstrip antenna).

  According to the electronic timepiece of the invention, since the patch antenna capable of receiving circularly polarized waves is used, it is possible to easily receive the circularly polarized microwaves. For example, the microwave in GPS is circularly polarized.

  (11) In the electronic timepiece of the invention, the antenna may be a patch antenna, and the predetermined value may be equal to or greater than a thickness of the antenna in a direction orthogonal to the reception surface.

  If the distance between the antenna and the metal member is equal to or greater than the thickness of the antenna, the antenna and the metal member are not electrically coupled and no loss occurs, so that the reception performance of the antenna is hardly deteriorated. Therefore, according to the electronic timepiece of the present invention, reliable reception can be maintained.

  (12) In the electronic timepiece of the invention, the solar cell may be disposed such that the light receiving surface faces substantially the entire back surface of the dial.

  In order for the solar cell to receive light transmitted through the dial plate, the dial plate needs to have a certain degree of transmittance. Therefore, a member disposed on the back side of the dial plate is visually recognized from the outside. In the electronic timepiece of the invention, the solar cell is arranged so that the entire light receiving surface of the solar cell faces the entire back surface of the dial. Therefore, since the color of the solar cell is visually recognized from the outside over the entire dial, the decorativeness can be improved.

  Moreover, in the electronic timepiece of the invention, the solar cell is arranged so that the entire light receiving surface of the solar cell faces the entire back surface of the dial, so that the light receiving surface of the solar cell can be made wider. Therefore, according to the electronic timepiece of the invention, the power generation efficiency of the solar cell can be further increased.

  (13) In the electronic timepiece of the invention, the antenna may be arranged at least at a part of a peripheral edge on the back side of the dial.

  (14) In the electronic timepiece of the invention, the peripheral portion may be a peripheral portion on the back side corresponding to a position from 12:00 to 6:00 on the surface of the dial.

  The peripheral edge on the back side corresponding to the position from 12 o'clock to 6 o'clock on the surface of the dial corresponds to the substantially right half region including the positions at 12 o'clock, 3 o'clock and 6 o'clock on the surface of the dial. It is the peripheral part of the back surface side.

  When the electronic timepiece of the present invention is worn on the left arm, the radiation pattern of the antenna tends to be directed toward the sky where GPS satellites exist in daily life such as when the user walks or runs. Therefore, according to the electronic timepiece of the present invention, microwaves can be easily received, and convenience is improved.

(15) In the electronic timepiece of the invention, the microwave is a satellite signal transmitted from a position information satellite, satellite information is acquired from the satellite signal received by the antenna, and time correction is performed based on the satellite information. A time correction information generation unit that generates information and a time information correction unit that corrects the time information based on the time correction information may be included.

  The satellite information is time information held by the position information satellite, orbit information of the position information satellite, and the like.

  The time correction information is information necessary for correcting the time information of the electronic timepiece. For example, time information of the position information satellite, time information calculated based on the time information, orbit information of a plurality of position information satellites The time difference information calculated based on

The figure for demonstrating the outline | summary of a GPS system. The figure for demonstrating the structure of a navigation message. The figure for demonstrating the circuit structure of the wristwatch with GPS of 1st Embodiment. The figure for demonstrating the structure of the control part (CPU) 40 of 1st Embodiment. The flowchart which shows an example of the time correction processing procedure of 1st Embodiment. The flowchart which shows an example of the time difference correction process sequence of 1st Embodiment. FIG. 7A is a schematic plan view of the GPS wristwatch according to the first embodiment, and FIG. 7B is a schematic sectional view of the GPS wristwatch according to the first embodiment. The figure for demonstrating the structure of the solar cell 22 in 1st Embodiment. The figure which shows an example of the radiation pattern of the GPS antenna 27 in 1st Embodiment. The figure which shows the measurement data regarding the receiving capability of a patch antenna. The figure for demonstrating an example of arrangement | positioning of the GPS antenna 27 in 1st Embodiment. The schematic sectional drawing of the modification of 1st Embodiment. The schematic sectional drawing of the wristwatch with GPS of 2nd Embodiment. The figure for demonstrating the structure of the solar cell 22 in 2nd Embodiment. The schematic sectional drawing of the wristwatch with GPS of 3rd Embodiment. The figure for demonstrating the structure of the solar cell 22 in 3rd Embodiment. The figure which shows an example of the external appearance of the wristwatch with GPS of the 1st-3rd embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. Also, not all of the configurations described below are essential constituent requirements of the present invention.

1. GPS system 1-1. Outline FIG. 1 is a diagram for explaining an outline of a GPS system which is a communication system using microwaves.

  The GPS satellite 10 orbits a predetermined orbit above the earth, and transmits a navigation message superimposed on a 1.57542 GHz microwave (L1 wave) to the ground. Here, the GPS satellite 10 is an example of a position information satellite in the present invention, and a 1.57542 GHz microwave (hereinafter referred to as “satellite signal”) on which a navigation message is superimposed is an example of a satellite signal in the present invention.

At present, there are about 30 GPS satellites 10, and in order to identify which GPS satellite 10 the satellite signal is transmitted from, each GPS satellite 10 is 1023 chip (Carse / AcquisitionCode) called 1023 chip (Coarse / AcquisitionCode) A unique pattern of 1 ms period) is superimposed on the satellite signal. The C / A code looks like a random pattern with each chip being either +1 or -1. Therefore, by correlating the satellite signal and the pattern of each C / A code, the C / A code superimposed on the satellite signal can be detected.

  The GPS satellite 10 is equipped with an atomic clock, and the satellite signal includes extremely accurate time information (hereinafter referred to as “GPS time information”) measured by the atomic clock. Further, a slight time error of the atomic clock mounted on each GPS satellite 10 is measured by a control segment on the ground, and the satellite signal includes a time correction parameter for correcting the time error. Therefore, the GPS receiver 1 can receive a satellite signal transmitted from one GPS satellite 10 and correct the internal time to an accurate time using GPS time information and time correction parameters included therein. it can.

  The satellite signal includes orbit information indicating the position of the GPS satellite 10 on the orbit. The GPS receiver 1 can perform positioning calculation using GPS time information and orbit information. The positioning calculation is performed on the assumption that a certain amount of error is included in the internal time of the GPS receiver 1. That is, in addition to the x, y, and z parameters for specifying the three-dimensional position of the GPS receiver 1, the time error is also an unknown. Therefore, the GPS receiver 1 generally receives satellite signals respectively transmitted from four or more GPS satellites, and performs positioning calculation using GPS time information and orbit information included therein.

1-2. Navigation Message FIGS. 2A to 2C are diagrams for explaining the configuration of the navigation message.

  As shown in FIG. 2 (A), the navigation message is configured as data with a main frame having a total number of 1500 bits as one unit. The main frame is divided into five sub-frames 1 to 5 each having 300 bits. Data of one subframe is transmitted from each GPS satellite 10 in 6 seconds. Accordingly, data of one main frame is transmitted from each GPS satellite 10 in 30 seconds.

  Subframe 1 includes satellite correction data such as week number data. The week number data is information representing a week including the current GPS time information. The starting point of the GPS time information is January 6, 1980, 00:00:00 in UTC (Coordinated Universal Time), and the week starting on this day is the week number 0. Week number data is updated on a weekly basis.

  The subframes 2 and 3 include ephemeris parameters (detailed orbit information of each GPS satellite 10). Further, the subframes 4 and 5 include almanac parameters (schematic orbit information of all GPS satellites 10).

  Further, subframes 1 to 5 include, from the beginning, a TLM (Telemetry) word storing 30-bit TLM (Telemetry word) data and a HOW word storing 30-bit HOW (hand over word) data. It is.

  Therefore, TLM words and HOW words are transmitted from the GPS satellite 10 at intervals of 6 seconds, whereas satellite correction data such as week number data, ephemeris parameters, and almanac parameters are transmitted at intervals of 30 seconds.

  As shown in FIG. 2B, the TLM word includes preamble data, a TLM message, a reserved bit, and parity data.

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

  The GPS receiver 1 can acquire GPS time information by acquiring the week number data included in the subframe 1 and the HOW word (Z count data) included in the subframes 1 to 5. However, if the GPS receiver 1 has previously acquired week number data and is counting the elapsed time since the time when the week number data was acquired internally, the GPS receiver 1 does not have to acquire the week number data. Current week number data can be obtained. Therefore, if the GPS receiver 1 acquires the Z count data, the current time other than the date can be known. For this reason, the GPS receiver 1 normally acquires only the Z count data as the current time.

  The TLM word, HOW word (Z count data), satellite correction data, ephemeris parameter, almanac parameter, etc. are examples of satellite information in the present invention.

  As the GPS receiver 1, for example, a wristwatch with a GPS device (hereinafter referred to as “GPS wristwatch”) can be considered. The GPS wristwatch is an example of an electronic timepiece according to the present invention, and the GPS wristwatch according to the present embodiment will be described below.

2. 2. Watch with GPS 2-1. First Embodiment [Circuit Configuration of GPS Wristwatch]
FIG. 3 is a diagram for explaining a circuit configuration of the GPS wristwatch 3 according to the first embodiment.

  The GPS wristwatch 3 receives a satellite signal from at least one GPS satellite 10 and corrects the internal time information based on the GPS time information (time measurement mode) and satellite signals from a plurality of GPS satellites 10. It is set to one of the modes (positioning mode) for receiving and performing positioning calculation to obtain the current location and correcting the internal time information based on the time difference specified from the current location and the GPS time information. That is, the GPS wristwatch 3 performs either a time correction process in the time measurement mode or a time correction process in the positioning mode (time difference correction process).

  The GPS wristwatch 3 includes a receiving module 30, a GPS antenna 27, a time display device 80, and a power supply device 90.

[Receiver module configuration]
The receiving module 30 is connected to a GPS antenna 27. The GPS antenna 27 is an antenna that receives satellite signals from a plurality of GPS satellites 10.

  The receiving module 30 includes a SAW (Surface Acoustic Wave) filter 31, an RF (Radio Frequency) unit 50, and a baseband unit 60. The SAW filter 31 performs a process of extracting a satellite signal from the signal received by the GPS antenna 27. That is, the SAW filter 31 is configured as a band-pass filter that passes a 1.5 GHz band signal.

  As will be described below, the RF unit 50 and the baseband unit 60 acquire satellite information such as orbit information and GPS time information included in the navigation message from the 1.5 GHz band satellite signal extracted by the SAW filter 31. I do.

  The RF unit 50 includes an LNA (Low Noise Amplifier) 51, a mixer 52, a VCO (Voltage Controlled Oscillator) 53, a PLL (Phase Locked Loop) circuit 54, an IF amplifier 55, an IF (Intermediate Frequency) filter 56, an ADC (ADC). (A / D converter) 57 and the like.

  The satellite signal extracted by the SAW filter 31 is amplified by the LNA 51. The satellite signal amplified by the LNA 51 is mixed with the clock signal output from the VCO 53 by the mixer 52 and down-converted to an intermediate frequency band signal. The PLL circuit 54 compares the phase of the clock signal obtained by dividing the output clock signal of the VCO 53 with the reference clock signal, and synchronizes the output clock signal of the VCO 53 with the reference clock signal. As a result, the VCO 53 can output a clock signal with a stable frequency accuracy of the reference clock signal. For example, several MHz can be selected as the intermediate frequency.

  The signal mixed by the mixer 52 is amplified by the IF amplifier 55. Here, by the mixing in the mixer 52, a high-frequency signal of several GHz is generated together with the signal in the intermediate frequency band. Therefore, the IF amplifier 55 amplifies a high frequency signal of several GHz along with the signal in the intermediate frequency band. The IF filter 56 passes the signal in the intermediate frequency band and removes the high frequency signal of several GHz (precisely, attenuates below a predetermined level). The intermediate frequency band signal that has passed through the IF filter 56 is converted into a digital signal by an ADC (A / D converter) 57.

  The baseband unit 60 includes a DSP (Digital Signal Processor) 61, a CPU (Central Processing Unit) 62, an SRAM (Static Random Access Memory) 63, and an RTC (Real Time Clock) 64. The baseband unit 60 is connected to a crystal oscillation circuit with temperature compensation circuit (TCXO: Temperature Compensated Crystal Oscillator) 65, a flash memory 66, and the like.

  A crystal oscillation circuit (TCXO) 65 with a temperature compensation circuit generates a reference clock signal having a substantially constant frequency regardless of the temperature.

  The flash memory 66 stores time difference information. The time difference information is information in which the time difference of each of a plurality of areas into which geographic information is divided is defined.

  When set to the timekeeping mode or the positioning mode, the baseband unit 60 performs a process of demodulating the baseband signal from the digital signal (intermediate frequency band signal) converted by the ADC 57 of the RF unit 50.

In addition, when set to the timekeeping mode or the positioning mode, the baseband unit 60 generates a local code having the same pattern as each C / A code in a satellite search process to be described later, and includes each baseband signal included in the baseband signal. Processing for correlating the C / A code and the local code is performed. Then, the baseband unit 60 adjusts the local code generation timing so that the correlation value for each local code has a peak, and if the correlation value is equal to or greater than the threshold, it synchronizes with the GPS satellite 10 of that local code (ie The GPS satellite 10 is captured). Here, the GPS system employs a CDMA (Code Division Multiple Access) system in which all GPS satellites 10 transmit satellite signals of the same frequency using different C / A codes. Therefore, by detecting the C / A code included in the received satellite signal, the GPS satellite 10 that can be captured can be searched.

  Further, the baseband unit 60 demodulates the navigation message by mixing the local code having the same pattern as the C / A code of the captured GPS satellite 10 and the baseband signal, and orbit information and GPS time information included in the navigation message. And the like are acquired and stored in the SRAM 63.

  The trajectory information and GPS time information included in the navigation message are examples of time correction information in the present invention, and the receiving module 30 functions as a time correction information generation unit in the present invention.

  The operation of the baseband unit 60 is synchronized with a reference clock signal output from a crystal oscillation circuit (TCXO) 65 with a temperature compensation circuit. The RTC 64 generates timing for processing satellite signals. The RTC 64 is counted up by a reference clock signal output from a crystal oscillation circuit (TCXO) 65 with a temperature compensation circuit.

[Configuration of time display device]
The time display device 80 includes a control unit (CPU) 40 and a crystal resonator 43.

  The control unit (CPU) 40 includes a storage unit 41, an oscillation circuit 42, and a drive circuit 44, and performs various controls.

  The control unit (CPU) 40 controls the reception module 30. That is, the control unit (CPU) 40 sends a control signal to the receiving module 30 to control the receiving operation of the receiving module 30.

  Further, the driving of the hands 12 is controlled via a drive circuit 44 in the control unit (CPU) 40.

  The storage unit 41 stores internal time information. The internal time information is time information measured inside the GPS wristwatch 3. The internal time information is updated by a reference clock signal generated by the crystal resonator 43 and the oscillation circuit 42. Therefore, even if the power supply to the receiving module 30 is stopped, the internal time information can be updated and the hand movement of the hands 12 can be continued.

  When set to the timekeeping mode, the control unit (CPU) 40 controls the operation of the reception module 30, corrects the internal time information based on the GPS time information, and stores it in the storage unit 41. More specifically, the internal time information is obtained by adding a UTC parameter (a cumulative leap second that is the difference between GPS time and UTC and currently -14 seconds) to the acquired GPS time information. Modified). When the positioning mode is set, the control unit (CPU) 40 controls the operation of the reception module 30 and corrects the internal time information based on the GPS time information, the UTC parameter, and the time difference data obtained from the current location. Is stored in the storage unit 41. That is, the control unit (CPU) 40 functions as a time information correction unit in the present invention.

[Configuration of power supply device]
The power supply device 90 includes the solar cell 22 incorporated in the charge control circuit 28, the secondary battery 24, the regulator 29, and the time display device 80.

The secondary battery 24 is connected to the receiving module 30 and the time display device 8 via the regulator 29.
Drive power is supplied to 0 etc. The current generated by the photovoltaic power generation of the solar cell 22 is supplied to the secondary battery 24 through the charge control circuit 28, and the secondary battery 24 is charged.

  The charge control circuit 28 is connected between the electrode of the solar cell 22 and the electrode of the secondary battery 24, and electrically connects between the electrode of the solar cell 22 and the electrode of the secondary battery 24 based on the control signal 40A. Or cut.

  Hereinafter, the procedure of the time correction process (time measurement mode) and the time difference correction process (positioning mode) in the GPS wristwatch 3 of the first embodiment will be described. The control unit (CPU) 40 can be realized by a dedicated circuit to perform various controls of these processes, but by executing a control program stored in the storage unit 41, various controls of these processes. It is also possible to perform. That is, as shown in FIG. 4, according to the control program, the control unit (CPU) 40 functions as a reception control means 40-1, a time information correction means 40-2, and a drive control means 40-3, and the time correction processing (measurement) Time mode) and time difference correction processing (positioning mode) are executed.

[Time correction processing (time measurement mode)]
FIG. 5 is a flowchart illustrating an example of a time correction process (time measurement mode) procedure of the GPS wristwatch 3 according to the first embodiment.

  When the GPS wristwatch 3 is set to the timekeeping mode, the time adjustment process (timekeeping mode) shown in FIG. 5 is executed.

  When the time adjustment process (time measurement mode) is started, the GPS wristwatch 3 first controls the reception module 30 by the reception control means 40-1 to perform the reception process. That is, the reception control means 40-1 activates the reception module 30, and the reception module 30 starts receiving satellite signals transmitted from the GPS satellite 10 (step S10).

  Next, the reception control means 40-1 starts a satellite search process (satellite search process) (step S12). In the satellite search step, the receiving module 30 performs a process of searching for a GPS satellite 10 that can be captured.

  Specifically, in the baseband unit 60, for example, when there are 30 GPS satellites 10, first, the satellite number SV is sequentially changed from 1 to 30, and the same pattern as the C / A code of the satellite number SV is obtained. Generate local code. Next, the baseband unit 60 calculates a correlation value between the C / A code and the local code included in the baseband signal. If the C / A code and the local code included in the baseband signal are the same code, the correlation value has a peak at a predetermined timing, but if the code is different, the correlation value does not have a peak and is always almost zero.

  The baseband unit 60 adjusts the local code generation timing so that the correlation value between the C / A code and the local code included in the baseband signal is maximized, and when the correlation value is equal to or greater than a predetermined threshold, the satellite number It is determined that the SV GPS satellite 10 has been captured. Then, the baseband unit 60 stores the captured information (for example, satellite number) of each GPS satellite 10 in the SRAM 63.

  Note that the code length of the local code is 1 ms, and even when the search process of about 30 GPS satellites 10 is performed while adjusting the local code generation timing, the search of all GPS satellites 10 is completed in about 2 seconds. can do.

  Next, the reception control means 40-1 determines whether or not it is timed out based on whether or not the elapsed time since the start of the satellite search process has exceeded a predetermined time (for example, 6 seconds) set in advance (step). S14).

  The reception control means 40-1 forcibly terminates the reception operation of the reception module 30 when the satellite search process times out (Yes in step S14) (step S32). When the GPS wristwatch 3 is in an environment where reception is not possible, for example, when it is indoors, there is no GPS satellite 10 that can be captured even if the satellite search process for all GPS satellites 10 is performed. If the GPS wristwatch 3 cannot detect a GPS satellite 10 that can be captured even after a predetermined time has elapsed, the GPS searching process is forcibly terminated to reduce unnecessary power consumption. be able to.

  On the other hand, if the satellite search process is completed before the time-out (Yes in step S16), the reception control means 40-1 determines whether or not the GPS satellite 10 has been captured (step S18).

  If the GPS satellite 10 cannot be captured (No in step S18), the reception control means 40-1 starts the satellite search process again (step S12).

  On the other hand, if the GPS satellite 10 can be captured (Yes in step S18), the reception control means 40-1 starts acquiring satellite information (particularly GPS time information) of the captured GPS satellite 10 (step S18). S20). Specifically, the baseband unit 60 performs processing for demodulating each captured navigation message from each GPS satellite 10 and acquiring Z count data for three subframes. Then, the baseband unit 60 stores the acquired GPS time information in the SRAM 63. If all the acquired Z count data for the three subframes are correct, the reception control unit 40-1 ends the acquisition of the satellite information.

  If the reception control means 40-1 times out before completing the acquisition of the satellite information of one or more GPS satellites 10 (Yes in step S22), it starts the satellite search process again (step S12). For example, since the reception level of the satellite signal from the GPS satellite 10 is low, it may be possible to time out without correctly demodulating the satellite information of one or more GPS satellites 10.

  On the other hand, if acquisition of the satellite information of one or more GPS satellites 10 can be completed before the time-out (in the case of Yes in step S24), the reception control means 40-1 The satellite information (GPS time information) is read from the SRAM 63, and the receiving operation of the receiving module 30 is terminated (step S26).

  And the time information correction means 40-2 corrects the internal time information memorize | stored in the memory | storage part 41 based on the GPS time information acquired from the receiving module 30 (step S28).

  Finally, the drive control means 40-3 controls the drive circuit 44 based on the corrected internal time information, and the time display is corrected (step S30).

[Time difference correction processing (positioning mode)]
FIG. 6 is a flowchart illustrating an example of a time difference correction process (positioning mode) procedure of the GPS wristwatch 3 according to the first embodiment. In the following description, the description of the same processing as the time correction processing (time measurement mode) procedure is omitted or simplified.

When the GPS wristwatch 3 is set to the positioning mode, the time difference correction process (positioning mode) shown in FIG. 6 is executed.

  When the time difference correction process (positioning mode) is started, the GPS wristwatch 3 first performs reception processing by controlling the reception module 30 by the reception control means 40-1. That is, the reception control means 40-1 activates the reception module 30, and the reception module 30 starts receiving the satellite signal transmitted from the GPS satellite 10 (step S100).

  Next, the reception control means 40-1 starts a satellite search process (satellite search process) (step S102).

  Next, the reception control means 40-1 determines whether or not there is a timeout depending on whether or not the elapsed time from the start of the satellite search process exceeds a predetermined time (for example, 6 seconds) set in advance (step S104). ).

  If the satellite search process has timed out (Yes in step S104), the reception control unit 40-1 forcibly ends the reception operation of the reception module 30 (step S128).

  On the other hand, if the satellite search process is completed before the time-out (Yes in step S106), the reception control means 40-1 has acquired a predetermined number (N) or more of GPS satellites 10 or not. Is determined (step S108). Here, in order to specify the three-dimensional position (x, y, z) of the GPS wristwatch 3, x, y, z are three unknowns. Therefore, in order to calculate the three-dimensional position (x, y, z) of the GPS wristwatch 3, GPS time information and orbit information of three or more GPS satellites 10 are required. Furthermore, in order to improve positioning accuracy, if the time error between the internal time information of the GPS wristwatch 3 and the GPS time information is also unknown, GPS time information and orbit information of four or more GPS satellites 10 are required.

  If N (for example, 4) or more GPS satellites 10 cannot be captured (No in step S108), the reception control means 40-1 starts the satellite search process again (step S102).

  On the other hand, when N (for example, four) or more GPS satellites 10 can be acquired (Yes in step S108), the reception control means 40-1 displays the satellite information (particularly GPS time) of the acquired GPS satellites 10. Acquisition of information and orbit information) (step S110). Specifically, the baseband unit 60 performs a process of demodulating each captured navigation message from each GPS satellite and obtaining Z count data and ephemeris parameters. And the baseband part 60 memorize | stores the acquired GPS time information and orbit information in SRAM63.

  When the reception control means 40-1 times out before acquiring satellite information of N (for example, four) or more GPS satellites 10 (Yes in step S112), the satellite search process starts again (step S102). ). For example, since the reception level of the satellite signal from the GPS satellite 10 is low, it may be possible to time out without correctly demodulating the satellite information of N (for example, four) or more GPS satellites 10.

  On the other hand, when acquisition of satellite information of N (for example, four) or more GPS satellites 10 can be completed before the time-out (in the case of Yes in step S114), the baseband unit 60 acquires the captured GPS satellites. A set of N (for example, 4) GPS satellites 10 is selected from 10 and positioning calculation is started (step S116).

Specifically, the baseband unit 60 reads the satellite information (GPS time information and orbit information) of the selected N (for example, four) GPS satellites 10 from the SRAM 63, performs positioning calculation, and obtains position information (with GPS). (Latitude and longitude of the place where the wristwatch 3 is located).

  Then, the baseband unit 60 refers to the time difference information stored in the flash memory 66 and acquires time difference data of a place where the GPS wristwatch 3 is located based on the position information and the positioning error. And the baseband part 60 will complete | finish positioning calculation, if time difference data can be acquired.

  If the reception control means 40-1 times out before completing the positioning calculation (Yes in step S118), the satellite search process starts again (step S102).

  On the other hand, if the positioning calculation can be completed before the time-out (Yes in step S120), the reception control means 40-1 reads out the GPS time information of at least one GPS satellite 10 from the SRAM 63 together with the time difference data. Then, the receiving operation of the receiving module 30 is terminated (step S122).

  And the time information correction means 40-2 corrects the internal time information memorize | stored in the memory | storage part 41 based on the GPS time information and time difference data acquired from the receiving module 30 (step S124).

  Finally, the drive control means 40-3 controls the drive circuit 44 based on the corrected internal time information, and the time display (time difference) is corrected (step S126).

[Structure of GPS wristwatch]
FIGS. 7A and 7B are diagrams for explaining the structure of the GPS wristwatch 3 according to the first embodiment. 7A is a schematic plan view of the GPS wristwatch 3, and FIG. 7B is a schematic cross-sectional view of the GPS wristwatch 3 in FIG. 7A.

  As shown in FIG. 7A, the GPS wristwatch 3 includes a dial 11 and hands 12. The pointer 12 includes a second hand, a minute hand, an hour hand, and the like, and is driven by a step motor via a gear.

  The GPS wristwatch 3 is configured to be able to set to the time measuring mode and the positioning mode by manually operating the crown 14, the button 15 (A button), and the button 16 (B button).

  For example, when the button 15 (A button) is pressed for several seconds (for example, 3 seconds) or longer, the GPS wristwatch 3 performs time correction processing in the time measurement mode. When the button 16 (B button) is pressed for several seconds (for example, 3 seconds) or longer, the GPS wristwatch 3 performs time correction processing (time difference correction processing) in the positioning mode.

  On the other hand, when the button 15 (A button) is pressed for a short time, the GPS wristwatch 3 displays the reception result in the previous timekeeping mode by the dial 11 and the hands 12. When the button 16 (B button) is pressed for a short time, the GPS wristwatch 3 displays the reception result in the previous positioning mode by the dial 11 and the hands 12. For example, when the reception is successful, the second hand moves to the “Y” position (10-second position), and when the reception fails, the second hand moves to the “N” position (20-second position).

  Note that the GPS wristwatch 3 can also periodically (automatically) execute the time measuring mode and the positioning mode.

  As shown in FIG. 7B, the GPS wristwatch 3 includes an exterior case 17 made of a metal such as stainless steel (SUS) or titanium.

  The exterior case 17 is formed in a substantially cylindrical shape, and a surface glass 19 is attached to the opening on the surface side via a bezel 18. The bezel 18 is made of a non-metallic material such as ceramic in order to improve satellite signal reception performance. A back cover 26 is attached to the opening on the back side of the exterior case 17.

  In the exterior case 17, a movement 13, a solar cell 22, a GPS antenna 27, a secondary battery 24, and the like are arranged.

  The movement 13 includes a step motor and a train wheel 21. The step motor is composed of a motor coil 20, a stator, a rotor, and the like, and drives the pointer 12 via a train wheel 21.

  A circuit board 25 is disposed on the back cover side of the movement 13, and the circuit board 25 is connected to the antenna substrate 23 and the secondary battery 24 via a connector 32.

  The circuit board 25 is provided with a receiving module 30 including a receiving circuit for processing a satellite signal received by the GPS antenna 27, a control unit (CPU) 40 for performing drive control of the step motor, and the like. The receiving module 30 and the control unit (CPU) 40 are covered with a shield plate 33 and are driven by electric power supplied from the secondary battery 24.

  The secondary battery 24 is a rechargeable secondary battery such as a lithium ion battery, and can store the power generated by the solar cell 22. That is, by electrically connecting the electrode of the solar cell 22 and the electrode of the secondary battery 24, the solar cell 22 performs photovoltaic power generation, and the secondary battery 24 is charged. In the present embodiment, a secondary battery such as a lithium ion battery is used as the secondary battery 24. However, the secondary battery 24 may be a power storage unit, and may be, for example, a capacitor.

  The solar cell 22 is disposed such that the light receiving surface 22a (the upper surface in FIG. 7B) faces a part of the back surface 11b (the surface opposite to the front surface (time display surface) 11a) of the dial plate 11 Photoelectric power is generated by receiving the light that has passed through the glass 19 and the dial 11.

  Since the dial 11 is visible from the outside, it is desirable to improve the appearance while transmitting light as much as possible using a material having low transmittance. Therefore, the dial 11 is made of a non-metallic material such as plastic or glass that transmits light.

  The GPS antenna 27 mounted on the antenna substrate 23 is an antenna that receives satellite signals from a plurality of GPS satellites 10, and is realized by a patch antenna, a helical antenna, a chip antenna, an inverted F antenna, or the like. Since the 1.57542 GHz microwave transmitted from the GPS satellite 10 is circularly polarized, it is preferable that the GPS antenna 27 be realized by a patch antenna capable of receiving circularly polarized waves.

  In the present embodiment, the GPS antenna 27 is disposed on the back surface 11 b side of the dial 11 in order to improve the decoration and wearability of the GPS wristwatch 3. Therefore, it is preferable that the dial 11 is made of a non-metal such as plastic or glass, which is a material that allows microwaves in the 1.5 GHz band to pass through, for example, a material having low conductivity and magnetic permeability.

The GPS antenna 27 receives microwaves (satellite signals) from the entire surface including the upper surface and side surfaces. Therefore, in this embodiment, between the back surface 11b of the dial plate 11 and the receiving surface 27a of the GPS antenna 27 (the top surface in FIG. 7B) so that the metallic member in the solar cell 22 does not shield the microwave. The solar cell 22 is not arranged. However, as the distance between the GPS antenna 27 and the solar cell 22 is shorter, the GPS antenna 27 and the metallic member in the solar cell 22 are electrically coupled to cause loss. Further, as the distance between the GPS antenna 27 and the solar cell 22 is shorter, the radiation pattern of the GPS antenna 27 is blocked by the solar cell 22 and the radiation pattern of the GPS antenna 27 becomes smaller. Since the transparent electrode 221 and the metal electrode 225, which are components of the GPS antenna 27, are made of a metallic member, the transparent electrode 221 and the metal electrode 225 in the solar cell with high conductivity deteriorate the reception performance. It is a big factor to make. For this reason, in this embodiment, the distance M ₁ between the GPS antenna 27 and the transparent electrode 221 and the metal electrode 225 of the solar cell 22 is arranged to be equal to or greater than a predetermined value so as not to deteriorate the reception performance.

In addition, the GPS antenna 27 is electrically coupled by a metal member other than the solar cell 22 so that no loss occurs, and the radiation pattern of the GPS antenna 27 is blocked by the metal member. Is arranged so that the distance from the metal member becomes a predetermined value or more so that the reception performance of the GPS antenna 27 does not deteriorate. For example, when the exterior case 17 and the movement 13 are made of a metal member, the GPS antenna 27 is arranged such that both the distance M ₂ to the exterior case 17 and the distance M ₃ to the movement 13 are equal to or greater than a predetermined value. The

As will be described later, in the case of a patch antenna, if the distance between the GPS antenna 27, the transparent electrode 221 of the solar cell 22, the metal electrode 225, and the metal member is equal to or greater than the thickness L in the direction orthogonal to the receiving surface 27a, Since it is not electrically coupled to the antenna 27 and no loss occurs, the reception performance of the antenna hardly deteriorates. For this reason, the distances M ₁ , M _2, and M ₃ are preferably equal to or greater than the thickness L of the GPS antenna 27 in the direction orthogonal to the receiving surface 27a.

  Although a space is created between the GPS antenna 27 and the outer case 17 or the movement 13, a spacer for fixing each component may be present in the space. The spacer is made of a non-metallic material that does not affect the reception performance.

FIGS. 8A and 8B are views for explaining the structure of the solar cell 22 in the GPS wristwatch 3 of the first embodiment. FIG. 8A is a view of the solar cell 22 as viewed from the direction in which light enters (upward in FIG. 7B). FIG. 8B is a cross-sectional view taken along the line II-II of the solar cell 22 shown in FIG. In FIG. 8B, for the sake of convenience, the vertical enlargement factor is larger than the horizontal enlargement factor, but the actual solar cell 22 has a thickness P of about several μm and is a GPS antenna. The thickness L of 27 and the distance M ₁ between the GPS antenna 27 and the metal electrode 225 of the solar cell 22 are about several millimeters.

  As shown in FIGS. 8A and 8B, the solar cell 22 has an opening 22c through which the pointer 12 passes. For example, when the GPS wristwatch 3 is a digital time display type wristwatch, the pointer 12 does not exist, so the opening 22c may be omitted, but the digital display is disposed on the back surface of the solar cell 22. Therefore, a separate opening is necessary so that it can be visually recognized from the outside.

Further, as shown in FIGS. 8A and 8B, the solar cell 22 has a structure in which amorphous silicon 228 formed on a plastic film substrate 226 is covered with protective films 220 and 227. The amorphous silicon 228 is composed of the p-type semiconductor 22.
2 and n-type semiconductor 224 are formed so as to sandwich i-type semiconductor 223, and surface 228a of amorphous silicon 228 (the surface facing back surface 11b of dial plate 11 in FIG. 7B) and back surface 228b (FIG. 7). A transparent electrode 221 and a metal electrode 225 are formed on the surface facing the movement 13 and the like in FIG.

  The plastic film substrate 226 may be made of a metallic material. When the plastic film substrate 226 is made of a metallic material, the plastic film substrate 226 is arranged such that the distance from the GPS antenna 27 is a predetermined value or more.

  When light that has passed through the protective film 220 and the transparent electrode 221 enters the surface 228a of the amorphous silicon 228, electrons and holes are generated in the i-type semiconductor 223 by the energy of the light. The generated electrons and holes move in the direction of the p-type semiconductor 222 and the n-type semiconductor 224, respectively. As a result, a current flows through an external circuit connected to the transparent electrode 221 and the metal electrode 225. In this way, the solar cell 22 performs photovoltaic power generation.

  As described above, since the solar cell 22 includes the transparent electrode 221 and the metal electrode 225 made of a metallic material, the effect of shielding the microwave is high, so that the microwave is not blocked. In the present embodiment, the solar cell 22 is not disposed between the back surface 11b of the dial plate 11 and the receiving surface 27a of the GPS antenna 27 (upper surface in FIG. 8B).

Further, in order to improve the microwave reception performance, that is, the GPS antenna 27, the transparent electrode 221 and the metal electrode 225 of the solar cell 22, and the outer case 17 are electrically coupled to suppress the occurrence of loss, and the GPS The GPS antenna 27 is arranged so that the radiation pattern of the antenna 27 is not blocked by the transparent electrode 221 and the metal electrode 225 of the solar cell 22 and the outer case 17 and the radiation pattern of the GPS antenna 27 is reduced. Are arranged such that the distance M ₁ between the transparent electrode 221 and the metal electrode 225 of the solar cell 22 and the distance M ₂ with respect to the outer case 17 are not less than a predetermined value.

  If the color and texture of the surface of the solar cell 22 can be visually recognized from the outside, the decorativeness of the GPS wristwatch 3 is not sufficient. Therefore, as shown in FIG. 7B, the solar cell 22 is arranged on the back surface 11b side of the dial plate 11 so that it is difficult to be visually recognized from the outside.

  FIG. 9 is a diagram illustrating an example of a radiation pattern of the GPS antenna 27 in the GPS wristwatch 3 according to the first embodiment.

The radiation pattern of the GPS antenna 27 is blocked by the transparent electrode 221 and the metal electrode 225 of the solar cell 22 and the outer case 17. Therefore, the radiation pattern of the GPS antenna 27 becomes smaller as the distance M ₁ between the GPS antenna 27 and the transparent electrode 221 and the metal electrode 225 of the solar cell 22 and the distance M ₂ between the GPS antenna 27 and the outer case 17 become shorter. Reception performance is degraded. Therefore, in the GPS wristwatch 3 of the first embodiment, the GPS antenna 27 is connected to the distance M ₁ between the transparent electrode 221 and the metal electrode 225 of the solar cell 22 and the outer case 17 in order to reduce the deterioration of the reception performance. distance M ₂ is arranged such that a predetermined value or more. It is preferable to determine M ₁ and M ₂ so that the reception performance of the GPS antenna 27 can be secured based on the measurement data.

  FIG. 10A and FIG. 10B are diagrams showing measurement data relating to the reception capability of the patch antenna used for the GPS antenna 27. The thickness L of the patch antenna in the direction orthogonal to the receiving surface (the thickness L of the GPS antenna 27 shown in FIGS. 7B and 8B) is 3 mm.

  The measurement data in FIG. 10A shows the relationship between the distance M between the patch antenna and the metal member or the housing corresponding thereto and the reception sensitivity of the 1.57542 GHz microwave (GPS L1 wave). In FIG. 10A, the horizontal axis represents the distance M between the patch antenna and the metal member or a casing equivalent thereto, and the vertical axis represents the relative sensitivity to the reception sensitivity when the distance M is infinite. According to the measurement data of FIG. 10A, the distance M between the patch antenna and the metal member or the casing corresponding thereto is the thickness L (3 mm) of the patch antenna (the radiation electrode on the upper surface of the patch antenna and the antenna on the lower surface of the patch antenna). If the distance is shorter than the distance between the substrates, the current that should flow between the radiation electrode on the top surface of the patch antenna and the substrate on the bottom surface of the patch antenna is electrically coupled to the radiation electrode on the top surface of the antenna and a metal member, resulting in loss. As a result, the amount of current to flow decreases, and the receiving sensitivity of the patch antenna deteriorates rapidly. Conversely, if the distance M between the patch antenna and the metal member is equal to or greater than the thickness L (3 mm) of the patch antenna, the reception sensitivity of the patch antenna hardly deteriorates.

  Not only the patch antenna but also other types of antennas, if there is a metal member or a casing conforming to it near the antenna, it will be electrically coupled to the metal member or casing conforming thereto, The reception sensitivity can be secured without degrading the reception sensitivity by taking a certain distance or more.

  The measurement data in FIG. 10B is the difference between the frequency M indicating the distance M between the patch antenna and the metal member or the case corresponding to the patch antenna and the maximum reception sensitivity and 1.57542 GHz (the frequency of the GPS L1 wave) (the tuning frequency). (Variation). In FIG. 10B, the horizontal axis represents the distance M between the patch antenna and the metal member or the casing equivalent thereto, and the vertical axis represents the variation of the tuning frequency. According to the measurement data of FIG. 10B, the distance M between the patch antenna and the metal member is shorter than the thickness L (3 mm) of the patch antenna (the distance between the radiation electrode on the upper surface of the patch antenna and the antenna substrate on the lower surface of the patch antenna). In this case, by arranging a metal member or a housing conforming thereto, the induction or capacitance component varies as the impedance of the antenna, and as a result, the variation in the tuning frequency increases rapidly. On the other hand, if the distance M between the patch antenna and the metal member or a casing conforming thereto is equal to or greater than the thickness L (3 mm) of the patch antenna, the frequency fluctuation is small.

From the measurement data of FIG. 10 (A) and FIG. 10 (B), the GPS antenna 27, the transparent electrode 221 and the metal electrode of the solar cell 22 shown in FIG. 7 (B), FIG. 8 (A) and FIG. 8 (B). If the distance M ₁ of 225 is less than or equal to L, the deterioration of the reception sensitivity and the frequency fluctuation are very small. That is, in order to reliably receive the satellite signal, the distance M ₁ between the GPS antenna 27, the transparent electrode 221 of the solar cell 22, and the metal electrode 225 is preferably L or less. Similarly, from the measurement data of FIGS. 10A and 10B, the distance M ₂ between the GPS antenna 27 and the outer case 17 and the distance M ₃ between the GPS antenna 27 and the movement 13 shown in FIG. Both are preferably L or more.

  FIG. 11A and FIG. 11B are diagrams for explaining an example of the arrangement of the GPS antenna 27 in the GPS wristwatch 3 according to the first embodiment.

  The GPS wristwatch 3 of the first embodiment is an analog time display type wristwatch with hands 12, and the hands 12 are arranged at the center of the dial 11 as shown in FIG. Since the movement 13 is arranged in the vicinity of the center inside the wristwatch and drives the hands 12, the GPS antenna 27 has a peripheral portion near the outer case 17 on the back surface 11b side of the dial plate 11 (in FIG. 11A, a diagonal line). At least a part of the region indicated by. Therefore, as shown in FIG. 9, the radiation pattern of the GPS antenna 27 is shielded by the outer case 17 and faces inward.

  Therefore, as shown in FIG. 11 (B), the GPS antenna 27 is an abbreviation including positions from 12 o'clock to 6 o'clock (12 o'clock, 3 o'clock, and 6 o'clock) on the surface (time display surface) 11a of the dial plate 11. It is preferable to be disposed at least at a part of the peripheral portion (region shown by hatching in FIG. 11B) on the back surface 11b side corresponding to the right half region). When the GPS antenna 27 is arranged in this manner, the radiation pattern of the GPS antenna 27 tends to be directed to the sky where the GPS satellites 10 exist in daily life such as when walking or running with the GPS wristwatch 3 attached to the left wrist. . Therefore, the microwave can be easily received, and convenience is improved.

[Effect of the first embodiment]
The distance at which an electromagnetic field incident on a material is attenuated to 1 / e is called skin depth, and a material with a smaller skin depth is less likely to transmit radio waves. The skin depth d of a conductor with magnetic permeability μ and conductivity σ with respect to a radio wave of frequency f is given by the following equation.

  According to Expression (1), the skin depth d decreases as the frequency f of radio waves increases. That is, the higher the frequency f, the more difficult it is to pass radio waves. For microwaves with a high frequency, the influence on the skin depth is particularly large. In other words, particularly a metallic material has a high conductivity σ, so that the skin depth increases. When the skin depth is large, the shielding effect against microwaves is greatly affected. Since the transparent electrode 221 and the metal electrode 225 included in the configuration of the solar cell 22 include a metallic material, the microwave effect is attenuated due to the shielding effect.

  In the GPS wristwatch 3 according to the first embodiment, as shown in FIG. 7B, the solar cell 22 does not exist between the back surface 11b of the dial 11 and the receiving surface 27a of the GPS antenna 27. The microwaves from 10 are not blocked by the solar cell 22 and can pass through the solar cell 22 as much as possible, thereby ensuring reliable reception. Therefore, even if the GPS antenna 27 is disposed inside the wristwatch on the back surface 11b side of the dial plate 11, reliable reception can be maintained. Therefore, according to the GPS wristwatch 3 of the first embodiment, restrictions on antenna arrangement can be relaxed, so that decorativeness and wearability can be improved.

Further, in the GPS wristwatch 3 according to the first embodiment, as shown in FIG. 7B, the GPS antenna 27 has a distance M ₁ between the transparent electrode 221 and the metal electrode 225 of the solar cell 22, and the outer case 17. The distance M ₂ and the distance M ₃ to the movement 13 are both set to a predetermined value or more. As the distance between the GPS antenna 27 and the metal member becomes shorter, the radiation pattern of the GPS antenna 27 becomes smaller and reception becomes difficult. However, in the GPS wristwatch 3 of the first embodiment, the GPS antenna 27 and the metal member are equal to or greater than a predetermined value. Therefore, it is possible to reduce degradation of reception performance. Furthermore, in the GPS wristwatch 3 according to the first embodiment, if the GPS antenna 27 is arranged so that the distance between the GPS antenna 27 and the metal member is equal to or greater than the thickness L of the GPS antenna 27, the deterioration in reception performance can be further reduced. Can do.

Further, in the GPS wristwatch 3 according to the first embodiment, the GPS antenna 27 is disposed on the peripheral edge near the outer case 17 as shown in FIG. Furthermore, as shown in FIG. 11 (B), the GPS antenna 27 is disposed on at least a part of the peripheral edge on the back surface 11b side corresponding to the position from 12 o'clock to 6 o'clock on the front surface 11a of the dial plate 11. When the user wears the GPS wristwatch 3 on the left wrist, the radiation pattern of the GPS antenna 27 is likely to face the sky where the GPS satellite 10 exists in daily life such as walking or running. Therefore, it is possible to easily receive the microwave, and convenience is improved.

  As described above, according to the first embodiment, since reliable reception can be maintained even if the GPS antenna 27 is arranged inside the wristwatch on the back surface 11b side of the dial plate 11, the decorativeness and the wearability are good. A GPS wristwatch can be provided.

[Modification]
FIG. 12 is a schematic cross-sectional view of a modification of the first embodiment. In FIG. 12, the same components as those in FIG. 7B are denoted by the same reference numerals.

  In the modification of the first embodiment, the light receiving surface 22a of the solar cell 22 and the receiving surface 27a of the antenna 27 are arranged on substantially the same plane.

The GPS antenna 27 is disposed so that the distance M ₁ between the transparent electrode 221 and the metal electrode 225 of the solar cell 22 is equal to or greater than a predetermined value so that the reception performance is not greatly deteriorated. Further, the GPS antenna 27 is arranged such that both the distance M ₂ to the exterior case 17 and the distance M ₃ to the movement 13 are equal to or greater than a predetermined value.

  Note that the other structures of the modified example are the same as the structure of FIG.

  In the present modification, the GPS antenna 27 is disposed closer to the surface glass 19 than the structure of FIG. Therefore, the radiation pattern of the GPS antenna 27 is less likely to be blocked by the outer case 17 and the transparent electrode 221 and the metal electrode 225 of the solar cell 22. Therefore, according to this modification, the reception performance of the GPS antenna 27 can be improved as compared with the GPS wristwatch 3 of FIG.

  In the present modification, the GPS antenna 27 is disposed in the vicinity of the back surface 11 b of the dial 11. Therefore, as compared with the structure of FIG. 7B, the degree of freedom of arrangement of other timepiece components in the wristwatch can be increased. For example, if it arrange | positions so that there may be as little gap as possible between each timepiece components, it will become possible to achieve the weight reduction by making the outer case 17 thinner.

2-2. Second Embodiment FIG. 13 is a schematic cross-sectional view of a GPS wristwatch 3 according to a second embodiment. In FIG. 13, the same components as those in FIG. 7B are denoted by the same reference numerals.

  In the GPS wristwatch 3 of the second embodiment, the solar cell 22 is arranged such that the light receiving surface 22a (the upper surface in FIG. 13) faces substantially the entire back surface 11b of the dial plate 11, and the front glass 19 and the dial plate 11 are disposed. Photoelectric power is generated by receiving the light that has passed through. Further, in order to improve the decoration and wearability of the GPS wristwatch 3, the GPS antenna 27 is disposed on the back surface 11b side of the dial plate 11 with the solar cell 22 interposed therebetween. That is, the GPS antenna 27 is disposed such that at least a part of the receiving surface 27a (the upper surface in FIG. 12) faces at least a part of the back surface 22b of the solar cell 22 (the surface opposite to the light receiving surface 22a). As a result, the GPS antenna 27 receives the satellite signal that has passed through the surface glass 19, the dial plate 11, and the solar cell 22.

The transparent electrode 221 and the metal electrode 225 of the solar cell 22 are highly effective in shielding microwaves. Therefore, the GPS antenna 27 is difficult to receive the microwave (satellite signal) that has passed through the transparent electrode 221 and the metal electrode 225 of the solar cell 22. Therefore, in the present embodiment, the solar cell 22 is not formed with the transparent electrode 221 and the metal electrode 225 at least between the back surface 11b of the dial plate 11 and the receiving surface 27a of the GPS antenna 27. Furthermore, the GPS antenna 27 is arranged so that the distance M ₁ between the transparent electrode 221 and the metal electrode 225 of the solar cell 22 is not less than a predetermined value so that the reception performance is not greatly deteriorated.

  The plastic film substrate 226 may be made of a metallic material. When the plastic film substrate 226 is made of a metallic material, the plastic film substrate 226 is arranged such that the distance from the GPS antenna 27 is a predetermined value or more.

Further, in the present embodiment, as in the first embodiment, the GPS antenna 27 is arranged such that the distance from the metal member is a predetermined value or more. That is, the GPS antenna 27 is disposed such that the distance M ₂ to the exterior case 17 and the distance M ₃ to the movement 13 are both equal to or greater than a predetermined value. As described above, when the GPS antenna 27 is a patch antenna, the distances M ₁ , M _2, and M ₃ are preferably equal to or greater than the thickness L of the GPS antenna 27.

  Since the other structure of the GPS wristwatch 3 of the second embodiment is the same as that of the GPS wristwatch 3 of the first embodiment, description thereof is omitted.

FIG. 14A and FIG. 14B are diagrams for explaining the structure of the solar cell 22 in the GPS wristwatch 3 according to the second embodiment. FIG. 14A is a view of the solar cell 22 as viewed from the direction in which light is incident (upward in FIG. 13). FIG. 14B is a cross-sectional view taken along the line II-II of the solar cell 22 shown in FIG. In FIG. 14B, for the sake of convenience, the vertical enlargement factor is larger than the horizontal enlargement factor, but the actual solar cell 22 has a thickness P of about several μm and is a GPS antenna. The thickness L of 27 and the distance M ₁ between the GPS antenna 27 and the metal electrode 225 of the solar cell 22 are about several millimeters.
14A and 14B, the same components as those in FIGS. 8A and 8B are denoted by the same reference numerals, and description thereof is omitted or simplified.

  As shown in FIGS. 14A and 14B, the solar cell 22 of the present embodiment has an opening 22c through which the pointer 12 passes. For example, when the GPS wristwatch 3 is a digital time display type wristwatch, the pointer 12 does not exist, so the opening 22c may be omitted, but the digital display is disposed on the back surface of the solar cell 22. Therefore, a separate opening is necessary so that it can be visually recognized from the outside.

  In order to increase the power generation efficiency of the solar cell 22, it is necessary to increase the amount of light incident on the surface 228a of the amorphous silicon 228 as much as possible. Therefore, it is desirable to increase the surface area of the amorphous silicon 228 as much as possible. However, as described above, since the transparent electrode 221 and the metal electrode 225 of the solar cell 22 have a high effect of shielding microwaves, in this embodiment, the back surface 11b of the dial 11 and the receiving surface 27a of the GPS antenna 27 (see FIG. 14 (B), the transparent electrode 221 and the metal electrode 225 are not formed in a portion sandwiched between the upper surfaces).

Further, in order to improve the microwave reception performance, the GPS antenna 27 is configured such that the distance M ₁ between the transparent electrode 221 and the metal electrode 225 of the solar cell 22 and the distance M ₂ between the outer case 17 are equal to or greater than a predetermined value. Is arranged.

The circuit configuration of the GPS wristwatch 3 of the second embodiment may be the same as the circuit configuration of the GPS wristwatch 3 of the first embodiment shown in FIG. Further, the time correction process (time measurement mode) procedure and the time difference correction process (positioning mode) procedure of the GPS wristwatch 3 of the second embodiment are the same as those of the GPS wristwatch 3 of the first embodiment shown in FIGS. The time correction process (time measurement mode) and the time difference correction process (positioning mode) may be the same as those in FIG. Further, the arrangement of the GPS antenna 27 in the GPS wristwatch 3 of the second embodiment is the same as the arrangement of the GPS antenna 27 in the GPS wristwatch 3 of the first embodiment shown in FIGS. 11 (A) and 11 (B). Therefore, the description thereof is omitted.

[Effects of Second Embodiment]
According to the GPS wristwatch 3 of the second embodiment, the following effects can be obtained.

  In the GPS wristwatch 3 according to the second embodiment, as shown in FIG. 13, the solar cell 22 is disposed between the transparent electrode 221 and the portion sandwiched between the back surface 11 b of the dial plate 11 and the receiving surface 27 a of the GPS antenna 27. The metal electrode 225 is not formed. The portion of the solar cell 22 where the transparent electrode 221 and the metal electrode 225 are not formed has a weak microwave shielding effect, so that the microwave from the GPS satellite 10 is not blocked by the solar cell 22 and the solar cell 22 is made as much as possible. By making it pass, reliable reception can be ensured. Therefore, even if the GPS antenna 27 is disposed inside the wristwatch on the back side of the solar cell 22, reliable reception can be maintained. Therefore, according to the GPS wristwatch 3 of the second embodiment, the restriction on the antenna arrangement can be relaxed, so that the decorativeness and the wearability can be improved.

  Further, in the GPS wristwatch 3 of the second embodiment, as shown in FIG. 13, the solar cell 22 is arranged so that the entire light receiving surface 22 a of the solar cell 22 faces the entire back surface 11 b of the dial 11. The Therefore, since the color of the solar cell 22 is visually recognized from the outside over the entire dial 11, the decorativeness can be improved. Moreover, since the light-receiving surface 22a of the solar cell 22 can be made wider, the power generation efficiency of the solar cell 22 can be further increased.

Further, in the GPS wristwatch 3 of the second embodiment, as shown in FIG. 13, the GPS antenna 27 has a distance M ₁ between the transparent electrode 221 and the metal electrode 225 of the solar cell 22 and a distance M with the outer case 17. ₂ and the distance M ₃ between the movement 13 and the movement 13 are both set to a predetermined value or more. That is, in the GPS wristwatch 3 according to the second embodiment, the GPS antenna 27 and the metal member are separated from each other by a distance greater than or equal to a predetermined value, so that deterioration in reception performance can be reduced. Furthermore, in the GPS wristwatch 3 according to the second embodiment, when the GPS antenna 27 is a patch antenna, the GPS antenna 27 is arranged so that the distance between the GPS antenna 27 and the metal member is equal to or greater than the thickness L of the GPS antenna 27. In this way, it is possible to further reduce the degradation of reception performance.

  Further, in the GPS wristwatch 3 according to the second embodiment, the GPS antenna 27 is disposed at the peripheral edge near the outer case 17 as shown in FIG. As in the first embodiment, the GPS antenna 27 is disposed at least at a part of the peripheral edge on the back surface 11b side corresponding to the position from 12 o'clock to 6 o'clock on the front surface 11a of the dial plate 11 so that the user can attach GPS. In a daily life such as walking or running with the wrist watch 3 attached to the left wrist, the radiation pattern of the GPS antenna 27 tends to be directed to the sky where the GPS satellite 10 exists. Therefore, it is possible to easily receive the microwave, and convenience is improved.

  As described above, according to the second embodiment, since reliable reception can be maintained even if the GPS antenna 27 is arranged inside the wristwatch on the back surface 11b side of the dial plate 11, the decorativeness and the wearability are good. A GPS wristwatch can be provided.

2-3. Third Embodiment FIG. 15 is a schematic cross-sectional view of a GPS wristwatch 3 according to a third embodiment. In FIG. 15, the same components as those in FIG. 7B are denoted by the same reference numerals.

  In the GPS wristwatch 3 of the third embodiment, the solar cell 22 is disposed such that the light receiving surface 22a (the upper surface in FIG. 15) faces substantially the entire back surface 11b of the dial plate 11, and the front glass 19 and the dial plate 11 are disposed. Photoelectric power is generated by receiving the light that has passed through. Further, in order to improve the decoration and wearability of the GPS wristwatch 3, the GPS antenna 27 is disposed on the back surface 11b side of the dial plate 11 with the solar cell 22 interposed therebetween.

  In the present embodiment, the solar cell 22 is transparent in the vicinity of the receiving surface 27a of the GPS antenna 27 including the portion sandwiched between the back surface 11b of the dial plate 11 and the receiving surface 27a (upper surface in FIG. 15) of the GPS antenna 27. The electrode 221 and the metal electrode 225 are formed in a mesh shape.

Moreover, in this embodiment, the GPS antenna 27 is arrange | positioned so that the distance with a metal member may become more than predetermined value similarly to 1st Embodiment and 2nd Embodiment. That is, the GPS antenna 27 is disposed such that the distance M ₂ to the exterior case 17 and the distance M ₃ to the movement 13 are both equal to or greater than a predetermined value. As described above, when the GPS antenna 27 is a patch antenna, the distances M ₁ , M _2, and M ₃ are preferably equal to or greater than the thickness L of the GPS antenna 27.

  Since the other structure of the GPS wristwatch 3 of the third embodiment is the same as that of the GPS wristwatch 3 of the first embodiment, description thereof is omitted.

FIGS. 16A and 16B are views for explaining the structure of the solar cell 22 in the GPS wristwatch 3 of the third embodiment. FIG. 16A is a view of the solar cell 22 as viewed from the direction in which light is incident (upward in FIG. 15). FIG. 16B is a cross-sectional view taken along the line II-II of the solar cell 22 shown in FIG. In FIG. 16B, for the sake of convenience, the vertical enlargement ratio is larger than the horizontal enlargement ratio, but the actual solar cell 22 has a thickness P of about several μm and is a GPS antenna. The thickness L of 27 and the distance M ₁ between the GPS antenna 27 and the metal electrode 225 of the solar cell 22 are about several millimeters.
In FIGS. 16A and 16B, the same components as those in FIGS. 8A and 8B are denoted by the same reference numerals, and description thereof is omitted or simplified.

  As shown in FIGS. 16A and 16B, the solar cell 22 of the present embodiment has an opening 22c through which the pointer 12 passes. For example, when the GPS wristwatch 3 is a digital time display type wristwatch, the pointer 12 does not exist, so the opening 22c may be omitted, but the digital display is disposed on the back surface of the solar cell 22. Therefore, a separate opening is necessary so that it can be visually recognized from the outside.

  In order to increase the power generation efficiency of the solar cell 22, it is necessary to increase the amount of light incident on the surface 228a of the amorphous silicon 228 as much as possible. Therefore, it is desirable to increase the surface area of the amorphous silicon 228 as much as possible. Therefore, in the present embodiment, the solar cell 22 is also disposed between the back surface 11 b of the dial 11 and the receiving surface 27 a of the GPS antenna 27. However, as described above, since the transparent electrode 221 and the metal electrode 225 of the solar cell 22 have a high effect of shielding microwaves, in this embodiment, the receiving surface 27a of the GPS antenna 27 (upper surface in FIG. 16B). The transparent electrode 221 and the metal electrode 225 in the vicinity of are formed in a mesh shape.

The circuit configuration of the GPS wristwatch 3 of the third embodiment may be the same as the circuit configuration of the GPS wristwatch 3 of the first embodiment shown in FIG. Also,
The time correction process (time measurement mode) procedure and the time difference correction process (positioning mode) procedure of the GPS wristwatch 3 of the third embodiment are the same as the time of the GPS wristwatch 3 of the first embodiment shown in FIGS. Since it may be the same as the correction process (time measurement mode) procedure and the time difference correction process (positioning mode) procedure, the description thereof is omitted. Further, the arrangement of the GPS antenna 27 in the GPS wristwatch 3 of the third embodiment is the same as the arrangement of the GPS antenna 27 in the GPS wristwatch 3 of the first embodiment shown in FIGS. 11 (A) and 11 (B). Therefore, the description thereof is omitted.

[Effect of the third embodiment]
According to the GPS wristwatch 3 of the third embodiment, the following effects can be obtained.

  In the GPS wristwatch 3 according to the third embodiment, as shown in FIG. 15, the solar cell 22 includes a portion of the GPS antenna 27 including a portion sandwiched between the back surface 11 b of the dial plate 11 and the receiving surface 27 a of the GPS antenna 27. Since the transparent electrode 221 and the metal electrode 225 in the vicinity of the receiving surface 27a are formed in a mesh shape, the area can be reduced. That is, since the microwaves from the GPS satellite 10 can mitigate attenuation by the solar cell 22, reliable reception can be ensured by passing the solar cell 22 as much as possible. Moreover, the loss which generate | occur | produces when the transparent electrode 221 and the metal electrode 225 of the solar cell 22 electrically couple | bond can be relieved. Therefore, even if the GPS antenna 27 is disposed inside the wristwatch on the back surface 22b side of the solar cell 22, reliable reception can be maintained. Therefore, according to the GPS wristwatch 3 of the third embodiment, the restriction on the antenna arrangement can be relaxed, so that the decorativeness and the wearability can be improved.

  Further, in the GPS wristwatch 3 of the third embodiment, the transparent electrode 221 and the metal electrode 225 of the solar cell 22 have a larger surface area than the GPS wristwatch 3 of the first and second embodiments. Therefore, the photovoltaic power generation efficiency by the solar cell 22 can be further increased.

In the GPS wristwatch 3 according to the third embodiment, as shown in FIG. 15, the GPS antenna 27 has a distance M ₂ to the exterior case 17 and a distance M ₃ to the movement 13 both equal to or greater than a predetermined value. Placed in. That is, in the GPS wristwatch 3 according to the third embodiment, since the GPS antenna 27 and the metal member are separated from each other by a distance equal to or larger than a predetermined value, it is possible to reduce deterioration in reception performance. Furthermore, in the GPS wristwatch 3 according to the third embodiment, when the GPS antenna 27 is a patch antenna, the GPS antenna 27 is arranged so that the distance between the GPS antenna 27 and the metal member is equal to or greater than the thickness L of the GPS antenna 27. In this way, it is possible to further reduce the degradation of reception performance.

  Further, in the GPS wristwatch 3 according to the third embodiment, the GPS antenna 27 is arranged at the peripheral edge near the outer case 17 as shown in FIG. Similar to the first embodiment and the second embodiment, the GPS antenna 27 is arranged on at least a part of the peripheral portion on the back surface side corresponding to the position from 12 o'clock to 6 o'clock on the front surface 11a of the dial plate 11. However, with the GPS wristwatch 3 attached to the left wrist, the radiation pattern of the GPS antenna 27 tends to be directed toward the sky where the GPS satellite 10 exists in daily life such as walking or running. Therefore, it is possible to easily receive the microwave, and convenience is improved.

  As described above, according to the third embodiment, reliable reception can be maintained even if the GPS antenna 27 is arranged inside the wristwatch on the back surface 11b side of the dial plate 11, so that the decoration and wearability are good. A GPS wristwatch can be provided.

2-4. Appearance of GPS wristwatch FIGS. 17A and 17B are views showing an example of the appearance of the GPS wristwatch 3 according to the first to third embodiments. For example, as shown in FIG. 17A, the GPS wristwatch 3 may be configured such that the solar cell 22 is not arranged in the space between the back surface of the dial 11 and the receiving surface of the GPS antenna 27. Good (first embodiment). For example, as shown in FIG. 17B, in the GPS wristwatch 3, the electrode between the solar cell 22 is not formed in the portion sandwiched between the back surface of the dial 11 and the receiving surface of the GPS antenna 27. The solar cell 22 may be configured such that a portion of the electrode sandwiched between the back surface of the dial 11 and the receiving surface of the GPS antenna 27 is formed in a mesh shape (second embodiment). (Third embodiment).

  As shown in FIGS. 17 (A) and 17 (B), the GPS wristwatch 3 of the first to third embodiments has a GPS antenna 27 disposed on the back side of the dial plate 11. Wearability is good. Further, the GPS antenna 27 is arranged on the back side of the 12 o'clock position of the dial 11 in FIG. 17A, and is arranged on the back side of the 6 o'clock position of the dial 11 in FIG. . Therefore, as described with reference to FIG. 11B, in the GPS wristwatch 3, the radiation pattern of the GPS antenna 27 is likely to face the sky where the GPS satellites 10 exist in daily life such as when the user is walking or running. Therefore, it is possible to easily receive the microwave, and convenience is improved.

  In addition, this invention is not limited to this embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention.

  For example, in the third embodiment, the case where the transparent electrode 221 and the metal electrode 225 of the solar cell 22 are formed in a mesh shape only in the vicinity of the reception surface 27a of the GPS antenna 27 has been described as an example. Both the electrode 221 and the metal electrode 225 may be formed in a mesh shape.

  Moreover, although the solar cell 22 of 1st Embodiment and 2nd Embodiment uses the plastic film board | substrate 226, the plastic film board | substrate 226 may be a metal substrate. In the case of a metal substrate, since a loss occurs due to a shielding effect that shields microwaves and electrical coupling with the GPS antenna 27, it is desirable that the GPS antenna 27 be disposed at a predetermined distance or more.

  Similarly, in the third embodiment, the solar cell 22 uses the plastic film substrate 226, but the plastic film substrate 226 may be a metal substrate. In the case of a metal substrate, it is desirable that a portion where the transparent electrode 221 and the metal electrode 225 of the solar cell 22 of the metal substrate overlap with a mesh portion is a mesh shape or a space.

  Further, for example, in each of the above-described embodiments, the analog time display type wristwatch that displays the time using the dial 11 and the hands 12 has been described as an example. However, the electronic timepiece of the present invention is not limited to the analog time display type wristwatch. Alternatively, a digital time display type wristwatch that digitally displays time information on the dial 11 without the hands 12 may be used.

  For example, each of the above-described embodiments has been described by taking a GPS wristwatch as an example. However, the electronic timepiece of the present invention is not limited to a GPS wristwatch, and may be another type of electronic timepiece. As another type of electronic timepiece, for example, a wristwatch that communicates with a mobile phone, a base station, or the like by Bluetooth, CDMA, or the like can be considered.

The present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. Further, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

1 GPS receiver, 3 GPS wristwatch, 10 GPS satellite, 11 dial, 12 pointer, 13 movement, 14 crown, 15 button, 16 button, 17 exterior case, 18 bezel, 19 surface glass, 20 motor coil, 21 wheels Row, 22 Solar cell, 23 Antenna board, 24 Secondary battery, 25 Circuit board, 26 Back cover, 27 GPS antenna, 28 Charge control circuit, 29 Regulator, 30 Receiver module, 31 SAW filter, 32 Connector, 33 Shield plate, 40 control unit (CPU), 41 storage unit, 42 oscillation circuit, 43 crystal resonator, 44 drive circuit, 50 RF unit, 51
LNA, 52 mixer, 53 VCO, 54 PLL circuit, 55 IF amplifier, 56 IF filter, 57 ADC (A / D converter), 60 baseband unit, 61 DSP, 62 CPU, 63 SRAM, 64 RTC, 65 Temperature compensation Crystal oscillator circuit with circuit (TCXO), 66 flash memory, 80 time display device, 90 power supply device, 220 protective film, 221 transparent electrode, 222 p-type semiconductor, 223 i-type semiconductor, 224 n-type semiconductor, 225 metal electrode, 226 Plastic film substrate, 227 Protective film, 228 Amorphous silicon

Claims (16)

An electronic wristwatch having a function of receiving a satellite signal transmitted from a GPS satellite using power generated by photovoltaic power generation as a power source,
A dial that transmits light;
A solar cell that receives the light transmitted through the dial and performs the photovoltaic power generation;
A patch antenna that is arranged so that at least a part of the receiving surface faces at least a part of the back surface of the dial plate, receives the satellite signal transmitted through the dial plate, and is separate from the solar cell;
A cylindrical outer case,
A surface glass attached to the surface side of the outer case,
The solar cell is not arranged in the space between the back surface of the dial and the patch antenna,
The patch antenna is arranged so that it does not overlap the solar cell in a side view, and the distance between the patch antenna and the surface glass is larger than the distance between the solar cell and the surface glass, and ,
An electronic wristwatch characterized in that all of the patch antennas are arranged inside the outer case in a plan view. In claim 1,
The solar cell is provided with a plastic film substrate. In claim 1 or 2,
The solar cell is characterized in that an opening for passing a pointer is formed. In any one of Claims 1 thru | or 3,
A control unit for controlling reception of the satellite signal;
The electronic wristwatch, wherein the control unit is mounted on a substrate different from a substrate on which the antenna is mounted. In any one of Claims 1 thru | or 4,
The solar cell is
An electronic wristwatch, wherein an opening is formed in a space sandwiched between a back surface of the dial and the antenna. In any one of Claims 1 thru | or 5,
The solar cell is
An electronic wristwatch characterized in that at least a part of a light receiving surface is arranged to face at least a part of a back surface of the dial. In any one of Claims 1 thru | or 6.
A time correction information generating unit that acquires satellite information from the satellite signal received by the antenna and generates time correction information based on the satellite information;
An electronic wristwatch comprising: a time information correction unit that corrects the time information based on the time correction information. In any one of Claims 1 thru | or 7,
The solar cell is
An electronic wristwatch characterized in that the light receiving surface is disposed so as to face substantially the entire back surface of the dial. In any one of Claims 1 thru | or 8.
The antenna is
An electronic wristwatch arranged on at least a part of a peripheral portion of the dial on the back side. In claim 9,
The peripheral portion is
An electronic wristwatch comprising a peripheral portion on the back side corresponding to a position from 12:00 to 6:00 on the surface of the dial. In any one of Claims 1 thru | or 10.
Including a watch part that is not the solar cell, at least partially formed of a metal member,
An electronic wristwatch, wherein the timepiece component is arranged so that a distance between the patch antenna and the metal member is a predetermined value or more. In claim 11,
An electronic wristwatch including an exterior case, a movement, and a back cover as the timepiece component.   In claim 12,
  An electronic wristwatch comprising a spacer disposed in a space between the patch antenna and the movement. In any of claims 11 to 13 ,
The electronic wrist watch according to claim 1, wherein the predetermined value is equal to or greater than a thickness in a direction orthogonal to a receiving surface of the patch antenna.   In any one of Claims 1 thru | or 11,
  Movement and
  An electronic wristwatch including a spacer disposed in a space between the patch antenna and the movement.   In any one of Claims 1 thru | or 15,
  An electronic watch comprising a bezel made of a non-metallic material.