JP6657995B2 - Electronic device and control method for electronic device - Google Patents

Description

  The present invention relates to an electronic device that receives a satellite signal and a control method of the electronic device.

2. Description of the Related Art Conventionally, an electronic device that receives a satellite signal from a position information satellite such as a GPS satellite executes a reception process of receiving a satellite signal when a predetermined reception condition is satisfied, and executes a reception process when reception fails. There is known an electronic device that enhances the reception success rate by stricter reception conditions (see Patent Document 1).
When the electronic device of Patent Document 1 detects a high illuminance state in which the illuminance of light hitting a solar cell is equal to or higher than an illuminance threshold level, the electronic device determines that the electronic device is being irradiated with sunlight outdoors and receives a satellite signal. Execute the process. Then, when the reception fails, the electronic device raises the illuminance threshold level and tightens the reception conditions.
Further, an electronic apparatus according to another embodiment of Patent Document 1 executes a reception process when the high illuminance state continues for a time threshold. Then, when the reception fails, the electronic device increases the time threshold and tightens the reception conditions.

JP 2012-150047 A

However, in the electronic device that changes the illuminance threshold level disclosed in Patent Document 1, for example, when the reception failure is caused by a short time in which the electronic device is placed in an environment where satellite signals can be received, the illuminance threshold level is reduced. It is likely that the reception success rate cannot be improved even if
Also, in the electronic device that changes the time threshold value in Patent Document 1, for example, if the cause of the reception failure is that the electronic device executes reception processing because strong illumination light is applied to the electronic device in a room. Even if the time threshold is lengthened, there is a high possibility that the reception success rate cannot be improved.
As described above, when only one of the illuminance threshold level and the time threshold is changed, the reception success rate may not be improved even if the reception fails or the reception conditions are strict.

  An object of the present invention is to provide an electronic device and a control method of the electronic device that can set reception conditions according to various usage environments of the electronic device and can improve a reception success rate.

  The electronic device of the present invention is a receiving unit that receives a satellite signal from a position information satellite, an illuminance detection unit that detects a value related to the illuminance of the emitted light, and a value detected by the illuminance detection unit. It is determined whether or not the continuation time of the high illuminance state in which the illuminance is equal to or greater than the illuminance threshold is equal to or greater than a time threshold. A receiving control unit to be executed, and a threshold setting unit that sets values of the illuminance threshold and the time threshold, wherein the threshold setting unit is configured to: when reception fails in the reception processing, a threshold change condition when reception fails Is determined, and one of the illuminance threshold value and the time threshold value is changed to a larger value according to the set illuminance threshold value.

The electronic device includes, for example, a solar cell as a power generation unit, and the illuminance detection unit detects an open voltage of the solar cell as a value related to illuminance.
According to the present invention, when light is applied to the electronic device and the duration of the high illuminance state is equal to or longer than the time threshold, the reception control unit operates the reception unit to execute the reception process.
Then, when the reception has failed in the reception processing, the threshold setting unit changes one of the illuminance threshold and the time threshold to a larger value according to the value of the illuminance threshold. The case where the reception has failed is intended when the time information cannot be obtained based on the satellite signal. To change to a larger value means to change to a higher value in the case of the illuminance threshold, and to change to a longer value in the case of the time threshold.
Normally, the illuminance of indoor illumination light is lower than the illuminance of direct sunlight. For this reason, when the value of the illuminance threshold is equal to or greater than the illuminance due to direct sunlight, the cause of the reception failure is not due to the fact that the electronic device has performed the reception process by illuminating the electronic device with the illumination light indoors. Therefore, it can be determined that there is a high possibility that the electronic device is placed in an environment where satellite signals can be received for a short time. As such a case, for example, a case where a user who carries an electronic device leaves a building and immediately enters another building or an underpass can be assumed. In this case, the threshold setting unit changes the time threshold to a longer value, so that it is difficult to execute the reception process in the same usage environment, and the reception success rate can be improved.
In addition, when the value of the illuminance threshold is less than the illuminance due to direct sunlight, the cause of the reception failure is, for example, that the electronic device has performed reception processing by illuminating the electronic device with illumination light indoors. It can be determined that there is a possibility. In this case, the threshold setting unit changes the illuminance threshold to a higher value, so that the reception process can be hardly executed in the same usage environment, and the reception success rate can be improved.
As described above, according to the present invention, the reception conditions for executing the reception processing can be set according to various usage environments of the electronic device, and the reception success rate can be improved.

  The electronic device of the present invention is a receiving unit that receives a satellite signal from a position information satellite, an illuminance detection unit that detects a value related to the illuminance of the emitted light, and a value detected by the illuminance detection unit. It is determined whether or not the continuation time of the high illuminance state in which the illuminance is equal to or greater than the illuminance threshold is equal to or greater than a time threshold. A reception control unit to be executed, and a threshold setting unit for setting the values of the illuminance threshold and the time threshold, wherein the threshold setting unit failed to receive the position information satellite because the reception processing could not acquire the position information satellite. In the case, it is determined that the threshold change condition at the time of reception failure has been met, and according to the set value of the illuminance threshold, one of the illuminance threshold and the time threshold is changed to a larger value. The location information satellite If was 捉 fails to receive, and maintains the value of the illuminance threshold and the time threshold.

The case where the reception has failed is intended when the time information cannot be obtained based on the satellite signal.
According to the present invention, similarly to the invention of the electronic device, the reception condition can be set according to various usage environments of the electronic device, and the reception success rate can be improved.
Also, the threshold setting unit, when the reception failed because the position information satellite could not be captured in the reception processing, it is determined that the threshold change condition was satisfied, and when the position information satellite was captured in the reception processing but reception failed, The values of the illuminance threshold and the time threshold are maintained.
If the positioning information satellite is captured but the reception fails, there is a possibility that the reception failed by chance. In such a case, the reception frequency can be maintained by maintaining the current reception conditions without making the reception conditions strict.

  In the electronic device according to the aspect of the invention, the threshold setting unit may change the time threshold to a longer value if the threshold change condition is satisfied and the illuminance threshold is set to a preset maximum value. Is preferred.

The maximum value of the illuminance threshold is set to, for example, the illuminance when the electronic device is irradiated with direct sunlight.
If the maximum value is set as the illuminance threshold, it can be determined that the cause of the reception failure is highly likely to be due to the short period of time when the electronic device is arranged in an environment where satellite signals can be received, When the threshold setting unit changes the time threshold to a longer value, the reception success rate can be improved.

  In the electronic device according to the aspect of the invention, the threshold setting unit may change the illuminance threshold to a higher value if the threshold change condition is satisfied, and the illuminance threshold is set to a value other than the maximum value. Is preferred.

  If a value other than the maximum value is set as the illuminance threshold, the cause of the reception failure is, for example, that the electronic device has performed reception processing by illuminating the electronic device with illumination light indoors. Since it can be determined that there is a possibility, the reception success rate can be improved by the threshold setting unit changing the illuminance threshold to a higher value.

  In the electronic device according to the aspect of the invention, the threshold setting unit may be configured so that the threshold change condition is satisfied, and the value of the set illuminance threshold is equal to or greater than a first predetermined illuminance value, and the maximum set in advance to the time threshold is set. If a value that is not a value is set, the time threshold is changed to a longer value, the threshold change condition is satisfied, and the value of the set illuminance threshold is equal to or greater than the first predetermined illuminance value. When the maximum value is set as the time threshold, it is preferable to change the illuminance threshold to a higher value.

The first predetermined illuminance value is set, for example, to the illuminance when the electronic device is irradiated with direct sunlight.
When the illuminance threshold value is equal to or greater than the first predetermined illuminance value, it can be determined that the cause of the reception failure is highly likely to be due to a short period of time during which the electronic device is placed in an environment where satellite signals can be received. Therefore, when a value other than the maximum value is set as the time threshold, the threshold setting unit changes the time threshold to a longer value, thereby improving the reception success rate.
However, even when the value of the illuminance threshold value is equal to or greater than the first predetermined illuminance value, the cause of the reception failure is that the electronic device performs the reception process because the electronic device irradiates the electronic device with illumination light stronger than direct sunlight indoors. It could also be due to things. In such a case, reception cannot be successful even if the time threshold is continuously changed to a longer value. According to the present invention, the maximum value of the time threshold is set, and even when the value of the illuminance threshold is equal to or greater than the first predetermined illuminance value, if the maximum value is set for the time threshold, the threshold setting unit sets the illuminance threshold To a higher value. For this reason, as described above, the reception success rate can be improved even when the electronic device is irradiated with illumination light stronger than direct sunlight indoors.

  In the electronic device according to the aspect of the invention, it is preferable that, when the illuminance threshold is changed to a higher value, the threshold setting unit set the time threshold to a preset minimum value.

The minimum value of the time threshold is a minimum value that can determine that the electronic timepiece may be placed outdoors.
According to the present invention, when the illuminance threshold is changed to a higher value, it is possible to minimize the time required to determine whether or not the reception condition is satisfied, and to minimize the time until the reception process is executed.

  The electronic device of the present invention is a receiving unit that receives a satellite signal from a position information satellite, an illuminance detection unit that detects a value related to the illuminance of the emitted light, and a value detected by the illuminance detection unit. It is determined whether or not the continuation time of the high illuminance state in which the illuminance is equal to or greater than the illuminance threshold is equal to or greater than a time threshold. A receiving control unit to be executed, and a threshold setting unit that sets values of the illuminance threshold and the time threshold, wherein the threshold setting unit is configured to: when reception fails in the reception processing, a threshold change condition when reception fails It is determined that the corresponding to the threshold change condition, and, when the position information satellite can be captured in the receiving process, the time threshold is changed to a longer value, the threshold change condition, And before the receiving process Failure to capture positional information satellites, and changes the illuminance threshold to a higher value.

The case where the reception has failed is intended when the time information cannot be obtained based on the satellite signal.
If the position information satellite can be captured in the reception processing, it can be determined that the cause of the reception failure is likely to be due to the short time that the electronic device is placed in the environment where the satellite signal can be received, When the threshold setting unit changes the time threshold to a longer value, the reception success rate can be improved as compared with a case where the time threshold is not changed.
Further, when the position information satellite could not be acquired in the reception processing, the cause of the reception failure is, for example, that the electronic apparatus executed the reception processing by illuminating the electronic apparatus with illumination light indoors. Since it can be determined that there is a possibility, the reception success rate can be improved by the threshold setting unit changing the illuminance threshold to a higher value.
As described above, according to the present invention, the reception conditions for executing the reception processing can be set according to various usage environments of the electronic device, and the reception success rate can be improved.

  In the electronic device according to the aspect of the invention, it is preferable that the threshold setting unit change the time threshold to a shorter value when the reception process has succeeded in receiving the data a predetermined number of times in succession.

When the reception is successful, the reception control unit does not execute the reception processing until, for example, the next day. The predetermined number of times is, for example, two times.
When reception has succeeded a predetermined number of times in succession in the reception process, it can be determined that there is a use environment in which the reception is easily successful. In such a case, even if the reception conditions are relaxed, it is possible to determine that the possibility that the reception will fail immediately is low. Therefore, the threshold setting unit changes the time threshold to a shorter value to determine whether the reception condition is satisfied. The time required for the determination can be shortened, and the time until the reception processing is executed can be shortened.

  In the electronic device according to the aspect of the invention, the threshold setting unit may change the illuminance threshold to a lower value when the reception process is not performed for a predetermined period without being in the high illuminance state. preferable.

The predetermined period is, for example, a period of 24 hours starting from a certain time.
If the reception process is not executed during the predetermined period without entering the high illuminance state, it can be determined that the reception process was not executed because the illuminance threshold is high. Therefore, in such a case, by changing the illuminance threshold to a lower value by the threshold setting unit, the possibility that the reception process is executed can be improved, and the reception interval can be suppressed from becoming longer.

  In the electronic device according to the aspect of the invention, when changing the illuminance threshold to a lower value, the threshold setting unit preferably sets a predetermined minimum value to the time threshold.

  According to the present invention, when the illuminance threshold is set to a value other than the maximum value, the time threshold can be set to the minimum value, so that the time required to determine whether the reception condition has been met can be minimized, The time until the reception processing is executed can be minimized.

  In the electronic device according to the aspect of the invention, the threshold setting unit may be in the high illuminance state, but the duration of the high illuminance state may not be equal to or longer than the time threshold, and the reception process may be performed for a predetermined period. If, and when the value of the set illuminance threshold is equal to or greater than a second predetermined illuminance value, the time threshold is changed to a shorter value, and the high illuminance state is not set. In the meantime, when the reception process is not executed, it is preferable to change the illuminance threshold to a lower value.

The second predetermined illuminance value is set, for example, to the illuminance when the electronic device is irradiated with direct sunlight.
Although the high illuminance state is set, the duration of the high illuminance state does not exceed the time threshold, the reception processing is not performed for a predetermined period, and the value of the set illuminance threshold is the second predetermined illuminance. If the value is equal to or greater than the value, it can be determined that the reception process has not been executed because the time threshold is long. Therefore, in such a case, by changing the time threshold to a shorter value by the threshold setting unit, it is possible to increase the possibility that the reception processing is executed, and to suppress the reception interval from becoming longer.
If the reception processing is not executed during the predetermined period without entering the high illuminance state, it can be determined that the reception processing has not been executed because the illuminance threshold is high. Therefore, in such a case, the threshold setting unit changes the illuminance threshold to a lower value, so that the possibility that the reception process is executed can be increased, and the reception interval can be suppressed from becoming longer.

The present invention is a control method for an electronic device, comprising: a step of detecting a value related to illuminance of light to be irradiated; and a step of detecting a high illuminance in which the illuminance is equal to or more than an illuminance threshold based on the value detected by the detecting step. Determining whether or not the duration of the state is equal to or greater than a time threshold, and if the duration of the high illuminance state is equal to or greater than the time threshold, executing a reception process of receiving a satellite signal from a position information satellite; If the reception fails in the processing, it is determined that the threshold change condition at the time of reception failure has been met, and one of the illuminance threshold and the time threshold is changed to a larger value according to the set illuminance threshold value. And the step of performing.
According to the present invention, a reception condition for executing a reception process can be set according to various usage environments of an electronic device, and a reception success rate can be improved.

  The present invention is a control method for an electronic device, comprising: a step of detecting a value relating to the illuminance of light to be irradiated; and Determining whether or not the duration of the state is equal to or greater than a time threshold, and if the duration of the high illuminance state is equal to or greater than the time threshold, executing a reception process of receiving a satellite signal from a position information satellite; If reception fails because the position information satellite cannot be captured in the process, it is determined that the threshold change condition at the time of reception failure has been met, and the illuminance threshold and the time are determined according to the set illuminance threshold value. Changing one of the thresholds to a larger value, and maintaining the values of the illuminance threshold and the time threshold when the position information satellite is captured in the reception processing but reception fails. , Characterized in that it comprises a.

  According to the present invention, the reception conditions can be set according to various usage environments of the electronic device, and the reception success rate can be improved. In addition, when the positioning information satellite is captured but reception fails, the reception frequency can be maintained by maintaining the current reception conditions without making the reception conditions strict.

The present invention is a control method for an electronic device, comprising: a step of detecting a value related to illuminance of light to be irradiated; and a step of detecting a high illuminance in which the illuminance is equal to or more than an illuminance threshold based on the value detected by the detecting step. Determining whether or not the duration of the state is equal to or greater than a time threshold, and if the duration of the high illuminance state is equal to or greater than the time threshold, executing a reception process of receiving a satellite signal from a position information satellite; If the reception fails in the processing, the step of determining that the threshold change condition at the time of reception failure has been met; and, if the threshold change condition is satisfied, and the position information satellite can be captured in the reception processing, the time Changing the threshold to a longer value; and changing the illuminance threshold to a higher value if the threshold change condition is satisfied and the position information satellite cannot be captured in the reception processing. A step, characterized in that it comprises a.
According to the present invention, a reception condition for executing a reception process can be set according to various usage environments of an electronic device, and a reception success rate can be improved.

FIG. 1 is a schematic diagram showing an electronic timepiece according to a first embodiment of the invention. FIG. 2 is a front view of the electronic timepiece according to the first embodiment. Sectional view of the electronic timepiece according to the first embodiment FIG. 2 is a block diagram illustrating a circuit configuration of the electronic timepiece according to the first embodiment. The figure which shows the structure of the mainframe of a navigation message. The figure which shows the structure of the TLM word of a navigation message. The figure which shows the structure of the HOW word of a navigation message. 5 is a flowchart illustrating processing in a control circuit according to the first embodiment. FIG. 4 is a diagram for explaining operation timings of charging state detection, open circuit voltage detection, and reception processing. 5 is a graph showing the relationship between the illuminance of light hitting a solar cell of an electronic timepiece and the open voltage of the solar cell. 4 is a graph showing the relationship between the illuminance of light hitting a solar cell of an electronic timepiece and the short-circuit current of the solar cell. The figure which shows the relationship between the open circuit voltage in a solar cell in each detection level, and the illuminance of the light which hits a solar cell. The figure which shows the relationship between the number of determinations and determination time. 9 is a flowchart illustrating processing in a control circuit according to a second embodiment of the present invention. 9 is a flowchart illustrating processing in a control circuit according to a third embodiment of the present invention. 9 is a flowchart illustrating processing in a control circuit according to a fourth embodiment of the present invention. 15 is a flowchart illustrating processing in a control circuit according to a fifth embodiment of the present invention. 15 is a flowchart illustrating processing in the control circuit according to the fifth embodiment. 15 is a flowchart illustrating processing in a control circuit according to a sixth embodiment of the present invention. 15 is a flowchart illustrating processing in a control circuit according to a sixth embodiment.

[First Embodiment]
FIG. 1 is a schematic diagram showing an electronic timepiece 1 of the present embodiment.
An electronic timepiece 1 as an electronic device receives time signals from at least one GPS satellite 100 among a plurality of GPS (Global Positioning System) satellites 100 orbiting the earth in a predetermined orbit and receives time information. It is configured to acquire and receive satellite signals from at least three GPS satellites 100 to calculate and acquire position information. The GPS satellite 100 is an example of a position information satellite, and a plurality of GPS satellites exist above the earth. At present, about 30 GPS satellites 100 orbit.

[Schematic configuration of electronic watch]
FIG. 2 is a front view of the electronic timepiece 1, and FIG. 3 is a cross-sectional view schematically illustrating the electronic timepiece 1.
The electronic timepiece 1 includes an outer case 30, a cover glass 33, and a back cover 34, as shown in FIGS.
The outer case 30 is configured by fitting a bezel 32 made of ceramic to a surface side of a cylindrical case 31 made of metal. As shown in FIG. 3, of the two openings of the outer case 30, the opening on the front side is closed by a cover glass 33, and the opening on the back side is closed by a back cover 34 made of metal. ing.
An A button 2, a B button 3, and a crown 4 are provided on a side surface of the outer case 30.

  Inside the outer case 30, the dial ring 35, the dial 11, the hands 21, 22, 23, 24, 25, 26, 27, 28, the calendar wheel 20, and the hands and the calendar wheel 20 are driven. A movement 125 and the like are provided.

The dial ring 35 has a ring shape and is made of plastic.
The dial 11 is formed of a light transmissive material such as plastic. The dial 11 is a circular plate member that displays time inside the outer case 30, has hands 21 to 28 between the dial 11 and the cover glass 33, and is arranged inside the dial ring 35.
The dial 11 is formed with holes through which the pointer shafts 29 of the hands 21, 22, 23, the pointer shafts (not shown) of the hands 24, 25, 26, 27, 28 penetrate, and an opening of the small calendar window 15. ing.

A solar cell 135 is provided between the dial 11 and the movement 125.
The solar cell 135 is a photovoltaic element that performs photovoltaic power generation that converts light energy into electric energy. The solar cell 135 can receive light transmitted through the cover glass 33 and the dial 11 and perform photovoltaic power generation.

The movement 125 is covered with the circuit board 120 from the back cover side. The drive mechanism 140 included in the movement 125 has a step motor and a wheel train such as gears, and the step motor drives the hands 21 to 28 and the calendar wheel 20 by rotating the pointer shaft via the wheel train. I do.
The drive mechanism 140 specifically includes first to sixth drive mechanisms. The first drive mechanism drives the hands 22 and the hands 23, the second drive mechanism drives the hands 21, the third drive mechanism drives the hands 24, the fourth drive mechanism drives the hands 25, and the fifth drive The mechanism drives the hands 26, 27, 28, and the sixth drive mechanism drives the calendar wheel 20.

The GPS antenna 110 is an antenna that receives microwaves in the 1.5 GHz band, is disposed on the back side of the dial 11, and is mounted on the antenna board 123 on the back cover 34 side. The portion of the dial 11 that overlaps with the GPS antenna 110 in a direction orthogonal to the dial 11 is formed of a material (for example, a nonmetallic material having low conductivity and low magnetic permeability) through which microwaves in the 1.5 GHz band are easily transmitted. Have been. Further, no solar cell 135 having electrodes is interposed between the GPS antenna 110 and the dial 11. Therefore, the GPS antenna 110 can receive a satellite signal transmitted through the cover glass 33 and the dial 11.
As the GPS antenna 110, a patch antenna (microstrip antenna), a helical antenna, a chip antenna, an inverted F antenna, and the like can be exemplified.

On the back cover side of the antenna substrate 123, a secondary battery 130 is provided.
The secondary battery 130 is a power source of the electronic timepiece 1 and stores power generated in the solar cell 135. Examples of the secondary battery 130 include a lithium ion battery.

  The circuit board 120 is connected to the antenna board 123 and the secondary battery 130 via the connector 121. The circuit board 120 includes a control circuit 47 and a GPS receiving circuit 45 on the back cover side. On the back cover side of the circuit board 120, a circuit retainer 122 for covering these components is provided.

[Electronic clock display mechanism]
The hands 21, 22 and 23 are attached to a pointer shaft 29 provided at the center of the plane of the dial 11 along the front and back directions of the dial 11. The pointer shaft 29 includes three pointer shafts to which the hands 21, 22, and 23 are attached.
On the inner peripheral side of the dial ring 35 surrounding the outer peripheral portion of the dial 11, as shown in FIG. Using this scale, the hands 21 display "seconds" at the first time (local time: for example, local time when in a foreign country), the hands 22 display "minutes" at the first time, and the hands 23 display The "hour" of the first time is displayed. Since “second” at the first time is the same as “second” at a second time described later, the user can also grasp “second” at the second time by checking the hands 21.
The dial ring 35 has an alphabetical letter “Y” at the 12-minute position and an alphabetical letter “N” at the 18-minute position. The pointer 21 indicates one of “Y” and “N”, and displays a satellite signal reception result.
The pointer 24 is attached to a pointer shaft provided at a position two o'clock from the center of the plane of the dial 11 and displays the day of the week.

The pointer 25 is attached to a pointer shaft provided at a position at 10 o'clock from the center of the plane of the dial 11.
On the outer periphery of the rotation area of the pointer 25, an alphabetical character of “DST” and a symbol of “○” are written. DST (daylight saving time) means daylight saving time. The pointer 25 indicates the setting of daylight saving time (DST: daylight saving time ON, ：: daylight saving time OFF) by designating these alphabets and symbols.
On the outer periphery of the rotation area of the pointer 25, a crescent-shaped sickle-shaped symbol 12 is written along the circumference. The symbol 12 is a power indicator of the secondary battery 130, and the battery capacity is displayed by the pointer 25 indicating a position corresponding to the battery capacity.

An airplane-shaped symbol 13 is written on the outer periphery of the rotation area of the pointer 25. This symbol indicates the airplane mode. The pointer 25 is set to the in-flight mode by indicating the symbol 13 and indicates that no reception is performed.
Further, a numeral “1” and a symbol “4+” are written on the outer periphery of the rotation area of the pointer 25. These numbers and symbols indicate the satellite signal reception mode. “1” receives the GPS time information and corrects the internal time (time mode), and “4+” receives the GPS time information and the orbit information, calculates the position information as the current position, and This means that the time and the time difference are corrected (positioning mode).

  The hands 26 and 27 are attached to a pointer shaft provided at the same position in the 6 o'clock direction from the center of the plane of the dial 11. The hands 26 display "minutes" at the second time (home time: for example, the time in Japan when in a foreign country), and the hands 27 display "hour" at the second time. The pointer 28 is attached to a pointer shaft provided at a position of 4 o'clock from the center of the plane of the dial 11. The pointer 28 indicates the morning and the afternoon of the second time.

  The small calendar window 15 is provided in an opening formed by opening the dial 11 in a rectangular shape, and the numbers printed on the calendar wheel 20 can be viewed from the opening. The calendar wheel 20 displays the date corresponding to the first time by making the number visible through the opening.

Time difference information 37 indicating a time difference from Coordinated Universal Time (UTC) is indicated on the dial ring 35 along a scale on the inner peripheral side with numerals and symbols other than numerals.
The bezel 32 provided around the dial ring 35 has city information 36 representing a representative city name using a standard time corresponding to the time difference information 37 written on the dial ring 35, and time difference information 37. It is also described in.
The pointer 21 displays the time difference information by instructing the time difference information 37 and the city information 36.

[Circuit configuration of electronic watch]
FIG. 4 is a block diagram showing a circuit configuration of the electronic timepiece 1. As shown in the figure, the electronic timepiece 1 includes a solar cell 135, a secondary battery 130, a GPS receiving circuit 45, a clock unit 46, a control circuit 47, a diode 41, a charge control switch 42, A charge state detection circuit 43 and a voltage detection circuit 44 are provided. Note that the configuration including the charge state detection circuit 43 and the voltage detection circuit 44 is an example of the illuminance detection unit of the present invention.

  The diode 41 is provided in a path for electrically connecting the solar cell 135 and the secondary battery 130, and does not interrupt the current (forward current) from the solar cell 135 to the secondary battery 130, and To the solar cell 135 (reverse current). The forward current flows only when the voltage of the solar cell 135 is higher than the voltage of the secondary battery 130, that is, only when charging. Further, a field effect transistor (FET) may be employed in place of the diode 41.

The charge control switch 42 connects and disconnects a current path from the solar cell 135 to the secondary battery 130, and a switching switch provided on a path for electrically connecting the solar cell 135 and the secondary battery 130. An element 421 is provided. When the switching element 421 transitions from the off state to the on state, it is turned on (connected), and when the switching element 421 transitions from the on state to the off state, it is turned off (disconnected).
For example, when the battery voltage of the secondary battery 130 is equal to or higher than a predetermined value so that the battery characteristics do not deteriorate due to overcharging, the charging is performed based on the binary control signal CTL3 output from the control circuit 47. The control switch 42 is turned off. In this case, the operation of a voltage detection circuit 44 described later is stopped based on a control signal CTL2 output from the control circuit 47.

  The switching element 421 is a p-channel transistor and is turned on when the gate voltage Vg1 is at a low level, and is turned off when the gate voltage Vg1 is at a high level. The gate voltage Vg1 is controlled by the control circuit 47.

  The charge state detection circuit 43 operates based on a binary control signal CTL1 that specifies the detection timing of the charge state output from the control circuit 47, and controls the state of charge (charge state) from the solar cell 135 to the secondary battery 130. ) Is detected, and the detection result RS1 is output to the control circuit 47. The state of charge is “charging” or “non-charging”, and the detection is performed based on the battery voltage VCC and the PVIN of the solar cell 135 when the charge control switch 42 is on. For example, when the voltage drop of the diode 41 is set to Vth and the on-resistance of the switching element 421 is ignored, when PVIN-Vth> VCC, it is determined to be “charging”, and when PVIN-Vth ≦ VCC, “non-charging” is determined. "Charging".

  In the present embodiment, the control signal CTL1 is a pulse signal having a cycle of 1 second, and the charge state detection circuit 43 detects the charge state while the control signal CTL1 is at a high level. That is, the charge state detection circuit 43 repeatedly detects the charge state in a one-second cycle while keeping the charge control switch 42 in the connected state.

  The detection of the state of charge is performed intermittently in order to reduce the power consumption of the state of charge detection circuit 43. If this reduction is unnecessary, the state of charge may be continuously detected. The charge state detection circuit 43 can be configured using, for example, a comparator, an A / D converter, and the like.

  The voltage detection circuit 44 operates based on a binary control signal CTL2 that specifies the detection timing of the voltage output from the control circuit 47, and detects the terminal voltage PVIN of the solar cell 135, that is, the open voltage of the solar cell 135. . Note that the charge control switch 42 is turned off based on the control signal CTL3 output from the control circuit 47 while the voltage detection circuit 44 is detecting the open circuit voltage. Further, the voltage detection circuit 44 outputs the open-circuit voltage detection result RS2 to the control circuit 47.

The GPS receiving circuit 45 as a receiving unit is connected to the GPS antenna 110 and processes a satellite signal received via the GPS antenna 110 to obtain GPS time information and position information.
Although not shown, the GPS receiving circuit 45 receives a satellite signal transmitted from the GPS satellite 100 and converts the signal into a digital signal, similarly to a normal GPS device, and an RF (Radio Frequency) unit. A BB unit (baseband unit) that demodulates a navigation message by executing a correlation determination, and information that obtains and outputs GPS time information and position information (positioning information) from the navigation message (satellite signal) demodulated by the BB unit. Acquisition means.

[Navigation message]
Here, a navigation message which is a satellite signal transmitted from the GPS satellite 100 and includes the respective pieces of acquired information will be described. The navigation message is modulated as 50 bps data into satellite radio waves.
5A to 5C are diagrams for explaining the configuration of the navigation message.
As shown in FIG. 5A, the navigation message is configured as data with a main frame having a total bit 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 100 in 6 seconds. Therefore, one mainframe data is transmitted from each GPS satellite 100 in 30 seconds.

Subframe 1 includes week number data (WN: week number) and satellite correction data.
The week number data is information indicating a week including the current GPS time information, and is updated on a weekly basis.
The sub-frames 2 and 3 include ephemeris parameters (detailed orbit information of each GPS satellite 100). Further, the subframes 4 and 5 include almanac parameters (approximate orbit information of all the GPS satellites 100).

  Further, the 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. Have been.

  Therefore, the TLM word and the HOW word are transmitted from the GPS satellite 100 at intervals of 6 seconds, while the week number data, satellite correction data, ephemeris parameters, and almanac parameters are transmitted at intervals of 30 seconds.

  As shown in FIG. 5B, the TLM word includes preamble data, a TLM message, Reserved bits, and parity data.

  As shown in FIG. 5C, the HOW word includes GPS time information called TOW (Time of Week, also referred to as “Z count”). In the Z count data, the elapsed time from 0:00 on Sunday every week is displayed in seconds, and returns to 0 at 0:00 on Sunday of the next week. 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.

Therefore, the electronic timepiece 1 can acquire the date information and the 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, when the electronic timepiece 1 previously acquires the week number data and internally counts the elapsed time from the time when the week number data was acquired, the electronic timepiece 1 does not need to acquire the week number data. You can get the current week number data.
Therefore, the electronic timepiece 1 only needs to acquire the week number data of the subframe 1 only when the week number data (date information) is not stored therein, such as after reset or when the power is turned on. When the week number data is stored, the electronic timepiece 1 can know the current time by acquiring the TOW transmitted every 6 seconds. For this reason, the electronic timepiece 1 usually acquires only TOW as time information.

Returning to FIG. 4, the clock unit 46 includes a movement 125, and is driven by the power stored in the secondary battery 130 to perform a timekeeping process. In the timekeeping process, the time is measured, and the time (first time and second time) according to the time is displayed on the surface of the electronic timepiece 1.
Here, the time measured by the clock unit 46 is corrected based on the GPS time information and the position information obtained by the GPS receiving circuit 45 receiving the satellite signal and processing the received satellite signal.

The control circuit 47 is configured by a CPU that controls the electronic timepiece 1. The control circuit 47 functions as a reception control unit 471 and a threshold setting unit 472 by executing various programs stored in a storage device (not shown).
The reception control unit 471 activates the GPS reception circuit 45 to execute a reception process when a reception condition that is a condition for executing reception is satisfied. The threshold setting unit 472 sets an illuminance threshold and a time threshold, which will be described later, that constitute the reception condition. Each function will be described in detail in the following description of the operation of the control circuit 47.

[Operation of control circuit]
The operation of the control circuit 47 in the electronic timepiece 1 will be described with reference to the flowchart of FIG.
The control circuit 47 starts control every day at 0:00:00. First, the reception control unit 471 activates the charge state detection circuit 43 at regular intervals (SA1). In the present embodiment, as shown in FIG. 7, the reception control unit 471 outputs the control signal CTL1 at one-second intervals, and operates the charge state detection circuit 43. When the control signal CTL1 is input, the charge state detection circuit 43 outputs a detection result RS1 indicating whether or not the battery is in a charge state to the control circuit 47. Therefore, the reception control unit 471 determines whether or not charging is being performed (SA2). The charge control switch 42 is turned off only at the timing when the voltage detection circuit 44 is activated, as described later.

[Control in non-charging state]
When the light hitting the electronic timepiece 1 is dark and power is not being generated in the solar cell 135, the charging state detection circuit 43 outputs a “non-charging” detection result RS 1 to the control circuit 47. In this case, the reception control unit 471 determines that charging is not being performed (SA2: No), and outputs a low-level control signal CTL2 from the control circuit 47.
Therefore, when SA2 is determined to be No, the reception control unit 471 can determine that the electronic timepiece 1 is not located outdoors and is likely not located at a location suitable for receiving satellite signals.

[Control in charge state]
On the other hand, when it is determined in SA2 that the battery is in the charged state (SA2: Yes), the reception control unit 471 operates the voltage detection circuit 44 (SA3). At this time, the charge control switch 42 is turned off by the reception control unit 471. That is, when the reception control unit 471 detects that the battery is being charged by the charge state detection circuit 43, the reception control unit 471 outputs the control signal CTL2 at one-second intervals and activates the voltage detection circuit 44. At this time, the charge control switch 42 is turned off by the control signal CTL3 from the control circuit 47, so that the solar cell 135 and the voltage detection circuit 44 are separated from the secondary battery 130. Therefore, the voltage detection circuit 44 can detect the open-circuit voltage corresponding to the illuminance of the light that strikes the solar cell 135 without being affected by the charging voltage of the secondary battery 130. Here, this open-circuit voltage is an example of a value relating to illuminance of the present invention.
When the charge control switch 42 is off, the charge state cannot be detected by the charge state detection circuit 43. Therefore, the reception control section 471 outputs the control signal CTL1 and the control signal CTL2 so that the output timing of the control signal CTL1 to the charge state detection circuit 43 does not match the output timing of the control signal CTL2 to the voltage detection circuit 44. The timing has been shifted.

In the present embodiment, the open-circuit voltage detected by the voltage detection circuit 44 increases as the illuminance in the solar cell 135 increases, as shown in FIG.
Further, a configuration may be used in which the short-circuit current of the solar cell 135 is detected as a value corresponding to the illuminance of light that strikes the solar cell 135, instead of the open-circuit voltage of the solar cell 135. That is, as shown in FIG. 9, a configuration in which a short-circuit current that increases as the illuminance in the solar cell 135 increases, may be applied. In the configuration for detecting the short-circuit current, similarly to the configuration for detecting the open-circuit voltage, the charge control switch 42 is turned off and the solar cell 135 and the secondary battery 130 are electrically disconnected, so that the secondary It is necessary not to be affected by the battery 130.
Such an open circuit voltage and a short circuit current have a correlation with the output value in the solar cell 135. Therefore, in the present embodiment, an open-circuit voltage or a short-circuit current is detected as a detection value.

  The reception control unit 471 determines the detection level corresponding to the open circuit voltage based on the detection result RS2 output from the voltage detection circuit 44 (SA4). In the present embodiment, the reception control unit 471 determines the detection level based on the relationship shown in FIG. Note that the open-circuit voltage and the illuminance in FIG. 10 represent the lower limit values at each detection level. For example, the reception control unit 471 has a detection level “7” when the open-circuit voltage is 5.6 V or more and less than 5.8 V, and has a detection level “9” when the open-circuit voltage is 5.9 V or more and less than 6.2 V. Is determined.

As illustrated in FIG. 6, the reception control unit 471 determines whether the detection level obtained in SA4 is equal to or higher than a preset threshold level (SA5).
The threshold level is set to a value corresponding to a preset illuminance threshold. Here, the relationship between the threshold level and the illuminance threshold is set in advance based on the relationship between the detection level and the illuminance of the light hitting the solar cell 135 shown in FIG. For example, if the illuminance threshold is 10,000 lux, the threshold level is set to “7”.
In the present embodiment, the illuminance threshold can be set to eight levels of 100 lux, 500 lux, 1000 lux, 2000 lux, 3000 lux, 5000 lux, 8000 lux, and 10000 lux. That is, the threshold level can be set to eight levels from “0” to “7”. That is, the maximum value of the threshold level is set to “7” corresponding to 100,000 lux.
That is, the reception control unit 471 determines whether the illuminance of the light hitting the solar cell 135 is in a high illuminance state in which the illuminance of the light hitting the solar cell 135 is equal to or greater than a preset illuminance threshold, or less than the illuminance threshold by determining whether the detection level is equal to or greater than the threshold level It can be determined whether the state is the low illuminance state.
Note that the relationship between the detection level, the open-circuit voltage of the solar cell 135, and the illuminance of light that strikes the solar cell 135 is not limited to the relationship shown in FIG. 10 and can be set as appropriate. As will be described later, the threshold level may increase or decrease in value, but in the present embodiment, the threshold level in the initial state is defined as “7”. The illuminance of light when irradiating the solar cell 135 under a fluorescent lamp is usually 500 to 1000 lux, whereas the illuminance of light when irradiating the solar cell 135 with direct sunlight is usually 10,000 lux or more . Therefore, the threshold level “7” corresponding to 10000 lux is set as the threshold level in the initial state.

  When No is determined in SA5 (in the case of a low illuminance state), the reception control unit 471 may determine that the electronic timepiece 1 is not placed outdoors and is not placed in a location suitable for receiving satellite signals. Is high.

When it is determined to be Yes in SA5 (in the case of the high illuminance state), the reception control unit 471 determines whether or not the set threshold level is the maximum value (“7”) (SA6). That is, the reception control unit 471 determines whether the illuminance threshold value is the maximum value (10000 lux).
If Yes is determined in SA6, the reception control unit 471 determines whether the high illuminance state (detection level ≧ threshold level) has been determined continuously for a preset threshold number of times (SA7).
Here, the threshold number is set to a value corresponding to a preset time threshold. Here, the relationship between the threshold number and the time threshold is set in advance based on the relationship between the number of determinations and the determination time shown in FIG. Note that the relationship in FIG. 11 shows a case where the open circuit voltage is detected at one second intervals. For example, if the time threshold is 10 seconds, the threshold count is set to “10”.
In the present embodiment, the time threshold can be set in 30 steps of 1 second, 2 seconds,... 30 seconds. That is, the threshold number of times can be set in 30 levels from “1” to “30”. That is, the maximum value of the threshold number is set to “30” corresponding to 30 seconds.
That is, the reception control unit 471 can determine whether or not the duration of the high illuminance state is equal to or longer than the time threshold by determining whether or not the high illuminance state is determined continuously for the threshold number of times.
Note that the relationship between the number of determinations and the determination time is not limited to the relationship shown in FIG. 11 and changes according to the voltage detection interval. For example, when the open circuit voltage is detected at intervals of 2 seconds, if the number of determinations is "5", the determination time is "10" seconds. As will be described later, the threshold count may increase or decrease in value, but in the present embodiment, the threshold count “1” corresponding to one second is set as the threshold count in the initial state. .

  If No is determined in any of SA2, SA5, and SA7, the reception control unit 471 determines whether or not the current time is 23:59:59 on the day when the control circuit 47 started the control. (SA8). In this way, the reception control unit 471 determines whether or not a predetermined period has elapsed without performing the reception process. In this case, the predetermined period is a 24-hour period starting from 0: 00: 00: 00. Then, if No is determined in SA8, the process returns to SA1, and the charge state detection circuit 43 is activated at a constant cycle.

  On the other hand, when it is determined to be Yes in SA8, the threshold setting unit 472 resets the threshold level so as to be lower by one level (SA9). That is, the illuminance threshold is changed to a value one level lower. Then, the control circuit 47 ends the processing, and shifts to the standby state until the control restart time when the processing is started next. Here, the control restart time is 0:00:00 which is one second later. As described above, when the state in which the detection level is lower than the threshold level continues for a predetermined period, the threshold level is easily set to be higher than the threshold level by resetting the threshold level to be lower by one level. As described above, since the conditions for operating the GPS receiving circuit 45 are made more relaxed, an opportunity to operate the GPS receiving circuit 45 can be provided.

On the other hand, if No is determined in SA6, or if Yes is determined in SA7, the reception control unit 471 operates the GPS receiving circuit 45 to receive a satellite signal from the GPS satellite 100. Is started (SA10).
The receiving process started in SA10 is an automatic receiving process that is automatically performed when a predetermined condition is met. In the automatic reception process, the reception process in the timekeeping mode is performed. That is, in the positioning mode, signals have to be received from three or more GPS satellites 100 in order to detect a position, and the reception processing time becomes longer. For this reason, it is preferable that the electronic timepiece 1 is placed outdoors until the signal reception is completed. However, in the automatic reception process, the user does not notice that the reception is being performed, and moves to the interior even during the reception. There is also a possibility that it will. For this reason, it is preferable that the reception in the positioning mode be performed only when the user performs a reception operation intentionally, that is, only during the forced reception processing.
On the other hand, in the timekeeping mode, time information can be acquired even when a signal is received from one GPS satellite 100, and the reception processing time can be shortened. Therefore, the receiving process can be executed without the user's intention, which is suitable for the automatic receiving process.

The threshold setting unit 472 determines whether the reception has been successfully performed by the reception process started in SA10 (SA11).
Note that the GPS receiving circuit 45 first searches for the GPS satellite 100, and the GPS receiving circuit 45 detects a satellite signal. When a satellite signal is detected (when the GPS satellite 100 is captured), reception of the satellite signal is continued and time information is received. When the time information can be received in this way, it is determined that the reception was successful. In other cases, that is, when the satellite signal is not detected by the GPS receiving circuit 45 or when the time information cannot be received, it is determined that the reception has failed.
Then, when it is determined that the reception is successful (SA11: Yes), the threshold setting unit 472 maintains the illuminance threshold and the time threshold without changing. Then, the control circuit 47 ends the process, and shifts to the standby state until 0:00:00 on the next day, which is the control restart time.

On the other hand, when it is determined that the reception has failed (SA11: No), the threshold setting unit 472 determines whether or not the satellite signal has been received in the reception processing, that is, whether or not the GPS satellite 100 has been captured. A determination is made (SA12).
If it is determined to be Yes in SA12, it can be determined that there is a possibility that the reception can be successful, so it is determined that the reception conditions do not need to be strict, and the threshold setting unit 472 maintains the illuminance threshold and the time threshold.

On the other hand, when the determination is NO in SA12, the threshold setting unit 472 determines that the threshold change condition at the time of reception failure has been met. Then, the threshold setting unit 472 determines whether the set threshold level is the maximum value (“7”) (SA13).
When it is determined as No in SA13, the threshold setting unit 472 resets the threshold level so as to increase by one level (SA14). That is, the illuminance threshold is changed to a value one level higher. Then, the control circuit 47 ends the processing and shifts to the standby state until the control restart time.

  On the other hand, when the determination is Yes in SA13, the threshold value setting unit 472 resets the threshold value to be increased by one (SA15). That is, the time threshold is changed to a value one step longer. Then, the control circuit 47 ends the processing and shifts to the standby state until the control restart time.

[Operation and Effect of First Embodiment]
If the reception fails, or if the maximum value is set for the illuminance threshold, the reason for the reception failure may be that the electronic clock 1 is placed in an environment where satellite signals can be received for a short time. Can be judged to be high. As such a case, for example, a case where the user wearing the electronic timepiece 1 leaves the building and immediately enters another building or an underground passage can be assumed. In such a case, the time threshold can be changed to a longer value by the threshold setting unit 472, and the reception process can be hardly executed in the same usage environment, so that the reception success rate can be improved.
In addition, when a value other than the maximum value is set as the illuminance threshold, the cause of the reception failure is, for example, that the electronic timepiece 1 has performed the reception processing because the illumination time has been applied to the electronic timepiece 1 indoors. Can be determined to be due to the In such a case, the threshold setting unit 472 can change the illuminance threshold to a higher value, making it difficult to execute the reception process in the same usage environment, and thus improving the reception success rate.
As described above, the reception conditions for executing the reception processing can be set according to various usage environments of the electronic timepiece 1, and the reception success rate can be improved.

  If the GPS satellite 100 is captured but reception fails, there is a possibility that reception has happened to have failed. In such a case, the current reception condition can be maintained without making the reception condition strict, so that the reception frequency can be maintained.

[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to the drawings.
Note that the structure of the electronic timepiece according to the present embodiment is the same as that of the first embodiment, and a detailed description thereof will be omitted or simplified.

FIG. 12 is a flowchart illustrating processing in the control circuit according to the second embodiment.
The present embodiment differs from the first embodiment in that, when the reception is successfully performed by the reception process, the time threshold is changed to a shorter value. The processing of SB1 to SB15 is the same as the processing of SA1 to SA15 in the first embodiment.

In the present embodiment, when it is determined that the reception is successful (SB11: Yes), the threshold setting unit determines whether the set threshold level is the maximum value ("7") (SB21). .
When it is determined as Yes in SB21, the threshold value setting unit determines whether the reception has succeeded a predetermined number of times continuously (SB22). The predetermined number of times is, for example, two times.
If No in SB21 or No in SB22, the control circuit ends the processing and shifts to the standby state until the control restart time.

  On the other hand, when it is determined as Yes in SB22, the threshold value setting unit resets the number of times of the threshold so as to be reduced by one (SB23). That is, the time threshold is changed to a value one step shorter. Then, the control circuit ends the processing and shifts to the standby state until the control restart time.

[Operation and Effect of Second Embodiment]
According to the present embodiment, a similar operation and effect can be obtained by a configuration similar to that of the first embodiment.
In addition, when reception has succeeded a predetermined number of times in succession in the reception process, it can be determined that there is an environment in which the reception is likely to succeed. In such a case, even if the reception conditions are relaxed, it can be determined that the possibility of the reception failure immediately is low. In such a case, since the time threshold can be changed to a shorter value by the threshold setting unit, the time for determining whether or not the reception condition is satisfied can be shortened, and the time until the reception processing is executed can be reduced. Can be shortened.

[Third embodiment]
Next, a third embodiment of the present invention will be described with reference to the drawings.
Note that the structure of the electronic timepiece according to the present embodiment is the same as that of the first embodiment, and a detailed description thereof will be omitted or simplified.

FIG. 13 is a flowchart illustrating processing in the control circuit according to the third embodiment.
In the present embodiment, when the current time is 23:59:59 and the illuminance threshold is changed to a value lower by one level without performing the reception process, the time threshold is initialized with respect to the second embodiment. Is different. The processing of SC1 to SC15 and SC21 to SC23 is the same as the processing of SA1 to SA15 and SA21 to SA23 in the second embodiment.

  In the present embodiment, the threshold setting unit resets the threshold level to one level lower in SC9, and then initializes the threshold count and sets the threshold value to the minimum value (“1”) (SC31). That is, the time threshold value is initialized and set to the minimum value (1 second). Then, the control circuit ends the processing and shifts to the standby state until the control restart time.

[Operation and Effect of Third Embodiment]
According to the present embodiment, the same operation and effect can be obtained by the same configuration as the second embodiment.
Also, after the illuminance threshold is changed to a value lower by one level, the number-of-times threshold is set to the minimum value. Therefore, when the illuminance threshold is next set to the maximum value, it is determined whether or not the reception condition is satisfied. Can be minimized, and the time until the reception processing is executed can be minimized.

[Fourth embodiment]
Next, a fourth embodiment of the present invention will be described with reference to the drawings.
Note that the structure of the electronic timepiece according to the present embodiment is the same as that of the first embodiment, and a detailed description thereof will be omitted or simplified.

FIG. 14 is a flowchart illustrating a process in the control circuit according to the fourth embodiment.
In the present embodiment, when the current time is 23:59:59 without performing the reception processing, it is determined that the detection level is equal to or higher than the threshold level with respect to the second embodiment. The difference is that one of the illuminance threshold and the time threshold is changed to a smaller value depending on whether or not the threshold is set. The processing of SD1 to SD8, SD10 to SD15, and SD21 to SD23 is the same as the processing of SB1 to SB8, SB10 to SB15, and SB21 to SB23 in the second embodiment.

  In the present embodiment, if the current time is 23:59:59 and the determination in SD8 is Yes, the threshold setting unit determines that the detection level is equal to or higher than the threshold level after the control circuit starts processing. It is determined whether or not the operation has been performed (SD41).

When it is determined to be Yes in SD41, the threshold setting unit resets the number of thresholds so as to be reduced by one (SD42). Then, the control circuit ends the processing and shifts to the standby state until the control restart time.
On the other hand, when it is determined as No in SD41, that is, when the reception process is not executed for a predetermined period (a period of 24 hours starting from 0:00) without being in the high illuminance state, the threshold setting unit sets Then, the threshold level is reset to be lower by one level (SD43). Then, the control circuit ends the processing and shifts to the standby state until the control restart time.

[Operation and Effect of Fourth Embodiment]
According to the present embodiment, the same operation and effect can be obtained by the same configuration as the second embodiment.
If the reception process is not executed during the predetermined period without entering the high illuminance state, it can be determined that the reception process was not executed because the illuminance threshold is high. In such a case, by changing the illuminance threshold to a lower value by the threshold setting unit, the possibility that the reception processing is executed can be improved, and the reception interval can be suppressed from becoming longer.
In addition, when the high-illuminance state is set but the duration of the high-illumination state does not exceed the time threshold and the reception processing is not executed for a predetermined period, the reception processing is executed because the time threshold is long. It can be determined that it has not been done. In such a case, by changing the time threshold value to a shorter value by the threshold value setting unit, it is possible to increase the possibility that the reception processing is executed, and to suppress an increase in the reception interval.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to the drawings.
Note that the structure of the electronic timepiece according to the present embodiment is the same as that of the first embodiment, and a detailed description thereof will be omitted or simplified.

FIG. 15 and FIG. 16 are flowcharts showing processing in the control circuit in the fifth embodiment.
This embodiment differs from the first embodiment in that it is determined whether or not the set threshold level is equal to or higher than a predetermined level in determining whether or not the reception condition is satisfied. When the satellite signal cannot be received by the reception process, one of the illuminance threshold and the time threshold is changed to a larger value depending on whether the set threshold level is equal to or higher than the predetermined level. If the current time is 23:59:59 without performing the process, one of the illuminance threshold and the time threshold is set to a smaller value depending on whether the set threshold level is equal to or higher than the predetermined level. They differ in that they have changed.
In the present embodiment, the maximum value of the threshold level is set to “10” corresponding to 100,000 lux, and the maximum value of the threshold count is set to “2” corresponding to 2 seconds.
The processing of SE1 to SE8 and SE10 to SE12 is the same as the processing of SA1 to SA8 and SA10 to SA12 in the first embodiment.

In the present embodiment, when YES is determined in SE5, the reception control unit 471 determines whether or not the set threshold level is equal to or higher than a preset predetermined level (SE51). The predetermined level is set to a value corresponding to a predetermined predetermined illuminance value based on the relationship between the detection level shown in FIG. 10 described above and the illuminance of the light hitting the solar cell 135. In the present embodiment, the predetermined illuminance value is 10000 lux, and the predetermined level is set to “7”.
If it is determined Yes in SE51, the control circuit advances the process to SE7. On the other hand, if No is determined in SE51, the control circuit advances the process to SE10.

When the satellite signal cannot be received in the reception process and the result of determination in SE12 is No, the threshold setting unit determines whether or not the set threshold level is equal to or higher than the predetermined level (SE52). That is, it is determined whether or not the illuminance threshold is equal to or greater than the predetermined illuminance value.
If it is determined Yes in SE52, the threshold setting unit determines whether the set threshold number is the maximum value (“2”) (SE53).
If No is determined in SE53, the threshold value setting unit resets the threshold number to be increased by one step (SE54). Then, the control circuit ends the processing and shifts to the standby state until the control restart time.

On the other hand, if No is determined in SE52 or Yes is determined in SE53, the threshold setting unit determines whether the set threshold level is the maximum value (“10”) ( SE55). If YES is determined in SE55, the control circuit ends the process and shifts to the standby state until the control restart time.
If No is determined in SE55, the threshold setting unit resets the threshold level so that the threshold level becomes one level higher (SE56).
Then, the threshold setting unit initializes the threshold number and sets it to the minimum value (one time) (SE57). Then, the control circuit ends the processing and shifts to the standby state until the control restart time.

  Thus, in the present embodiment, when reception continues to fail while the threshold level is set to a predetermined level or higher, the threshold level and the threshold time are alternately changed to larger values. .

If the current time is 23:59:59 and it is determined as Yes in SE8, the threshold setting unit determines whether the set threshold level is equal to or higher than the predetermined level (SE58).
When the determination is Yes in SE58, the threshold setting unit determines whether or not the detection level has been determined to be equal to or higher than the threshold level since the control circuit started the processing (SE59).
When it is determined Yes in SE59, the threshold value setting unit resets the number of times of the threshold value to a value smaller by one step (SE60). Then, the control circuit ends the processing and shifts to the standby state until the control restart time.

On the other hand, when No is determined in SE58 or No is determined in SE59, the threshold setting unit determines whether the set threshold level is the minimum value (“0”). (SE61). When it is determined Yes in SE61, the control circuit ends the processing and shifts to the standby state until the control restart time.
When it is determined as No in SE61, the threshold setting unit resets the threshold level so that the threshold level becomes one level lower (SE62).
Then, the threshold value setting unit initializes the threshold number and sets the threshold value to the minimum value (one time) (SE63). Then, the control circuit ends the processing and shifts to the standby state until the control restart time.

[Operation and Effect of Fifth Embodiment]
If the value of the illuminance threshold is equal to or greater than the predetermined illuminance value, it can be determined that the cause of the reception failure is highly likely to be due to the short period of time during which the electronic timepiece is placed in an environment where satellite signals can be received, If a value other than the maximum value is set as the time threshold, the threshold setting unit changes the time threshold to a longer value, thereby improving the reception success rate.
If the value of the illuminance threshold is less than the predetermined illuminance value, the cause of the reception failure may be, for example, that the electronic watch has performed reception processing by illuminating the electronic watch with illumination light indoors. Therefore, the threshold setting unit changes the illuminance threshold to a lower value, so that the reception success rate can be improved.

However, even when the value of the illuminance threshold is equal to or greater than the predetermined illuminance value, the cause of the reception failure is that the electronic watch performs reception processing by illuminating the electronic watch with illumination light stronger than direct sunlight indoors. It could be something. In such a case, reception cannot be successful even if the time threshold is continuously changed to a longer value. According to the present embodiment, even when the value of the illuminance threshold is equal to or greater than the predetermined illuminance value, if the maximum value is set for the time threshold, the threshold setting unit changes the illuminance threshold to a higher value. For this reason, as described above, the reception success rate can be improved even when the electronic timepiece is irradiated with illumination light stronger than direct sunlight indoors.
As described above, the reception conditions for executing the reception processing can be set according to various usage environments of the electronic timepiece, and the reception success rate can be improved.
In addition, when the illuminance threshold is changed to a higher value, the threshold setting unit sets the minimum value to the time threshold, so that the time required to determine whether the reception condition is satisfied can be minimized, and the reception process can be performed. Time to execution can be minimized.

Although the high illuminance state is set, the duration of the high illuminance state does not exceed the time threshold, the reception process is not performed for a predetermined period, and the value of the set illuminance threshold is equal to or more than the predetermined illuminance value. In the case of (SE59: Yes), it can be determined that the reception process has not been executed because the time threshold is long. Therefore, in such a case, by changing the time threshold to a shorter value by the threshold setting unit, it is possible to increase the possibility that the reception processing is executed, and to suppress the reception interval from becoming longer.
On the other hand, if the reception process has not been executed during the predetermined period without entering the high illuminance state (SE59: No), it can be determined that the reception process has not been executed because the illuminance threshold is high. Therefore, in such a case, the threshold setting unit changes the illuminance threshold to a lower value, so that the possibility that the reception process is executed can be increased, and the reception interval can be suppressed from becoming longer. Further, in this case, by setting the minimum value to the time threshold by the threshold value setting unit, the time required to determine whether the reception condition has been met can be minimized, and the time until the reception processing is executed can be minimized. it can.

[Sixth embodiment]
Next, a sixth embodiment of the present invention will be described with reference to the drawings.
Note that the structure of the electronic timepiece according to the present embodiment is the same as that of the first embodiment, and a detailed description thereof will be omitted or simplified.

FIG. 17 and FIG. 18 are flowcharts showing processing in the control circuit in the sixth embodiment.
In the present embodiment, as compared with the first embodiment, there is no processing corresponding to SA6 in the determination as to whether or not the reception condition is satisfied, and the set threshold level is the maximum value. The point that no judgment has been made, the point that one of the illuminance threshold and the time threshold has been changed to a larger value depending on whether or not the satellite signal has been received by the reception processing, and that the current time is When 23:59:59 is reached, one of the illuminance threshold and the time threshold is changed to a smaller value depending on whether or not the detection level has been determined to be equal to or higher than the threshold level. The processing of SF1 to SF5, SF7, SF8, SF10 to SF12 is the same as the processing of SA1 to SA5, SA7, SA8, SA10 to SA12 in the first embodiment.

  In the present embodiment, when SF5 is determined as YES, the reception control unit does not determine whether the set threshold level is the maximum value, and performs high illuminance continuously for the threshold number of times in SF7. It is determined whether or not the state (detection level ≧ threshold level) has been determined.

If the reception has failed but the satellite signal can be received by the reception process and the result of SF12 is “Yes”, the threshold setting unit determines whether the set threshold number is the maximum value (“30”). It is determined whether or not it is not (SF71). When it is determined as Yes in SF71, the control circuit ends the process and shifts to the standby state until the control restart time.
On the other hand, when No is determined in SE71, the threshold value setting unit resets the number of times of the threshold to be increased by one (SE72). Then, the control circuit ends the processing and shifts to the standby state until the control restart time.

On the other hand, when the satellite signal cannot be received in the reception processing and the result of determination in SE12 is No, the threshold setting unit determines whether the set threshold level is the maximum value (“7”) ( SF73). When it is determined Yes in SE73, the control circuit ends the process and shifts to the standby state until the control restart time.
If No is determined in SE73, the threshold setting unit resets the threshold level to a value that is one level higher (SF74). Then, the control circuit ends the processing and shifts to the standby state until the control restart time.

When the current time is 23:59:59 and the result of SF8 is “Yes”, the threshold setting unit determines that the detection level is equal to or higher than the threshold level after the control circuit starts processing. Is determined (SF75).
When it is determined to be Yes in SF75, the threshold value setting unit resets the number of times of the threshold so as to be reduced by one (SF76). Then, the control circuit ends the processing and shifts to the standby state until the control restart time.

On the other hand, when it is determined No in SF75, the threshold setting unit determines whether the set threshold level is the minimum value (“0”) (SF77). When it is determined to be Yes in SF77, the control circuit ends the process and shifts to the standby state until the control restart time.
If No is determined in SF77, the threshold value setting unit resets the threshold level to a value lower by one level (SF78).
Then, the threshold setting unit initializes the threshold number and sets it to the minimum value (one time) (SF79). Then, the control circuit ends the processing and shifts to the standby state until the control restart time.

[Operation and Effect of Sixth Embodiment]
If the reception fails and the GPS satellite 100 can be captured in the reception processing, the reason for the reception failure may be that the electronic clock is placed in an environment where satellite signals can be received for a short time. Is higher, the threshold setting unit changes the time threshold to a longer value, so that the reception success rate can be improved as compared with the case where the time threshold is not changed.
Further, when the GPS satellite 100 cannot be captured in the reception processing, the reason why the reception has failed is, for example, that the electronic watch has performed the reception processing by illuminating the electronic watch with illumination light indoors. Since it can be determined that there is a possibility, the reception success rate can be improved by the threshold setting unit changing the illuminance threshold to a higher value.
As described above, the reception conditions for executing the reception processing can be set according to various usage environments of the electronic timepiece, and the reception success rate can be improved.

Although the high illuminance state is set, but the duration of the high illuminance state does not exceed the time threshold and the reception processing is not executed for a predetermined period, the reception processing cannot be executed because the time threshold is long. Can be determined. Therefore, in such a case, by changing the time threshold to a shorter value by the threshold setting unit, it is possible to increase the possibility that the reception processing is executed, and to suppress the reception interval from becoming longer.
On the other hand, when the reception process is not performed during the predetermined period without entering the high illuminance state, it can be determined that the reception process has not been performed because the illuminance threshold is high. Therefore, in such a case, by changing the illuminance threshold to a lower value by the threshold setting unit, the possibility that the reception process is executed can be improved, and the reception interval can be suppressed from becoming longer. In this case, since the threshold setting unit sets the minimum value to the time threshold, it is possible to minimize the time required to determine whether or not the reception condition is satisfied, and to minimize the time until the reception process is executed.

[Other embodiments]
It should be noted that the present invention is not limited to the above-described embodiments, but includes modifications and improvements as long as the object of the present invention can be achieved.

  In the first to fifth embodiments, when the reception processing fails to receive a satellite signal (because a position information satellite cannot be acquired) in a reception process, the threshold setting unit satisfies a threshold change condition at the time of reception failure. However, the present invention is not limited to this. That is, when the reception fails, it may be determined that the threshold change condition is satisfied regardless of whether or not the satellite signal has been received, and one of the illuminance threshold and the time threshold may be changed to a larger value.

In the first to fourth embodiments, the reception control unit executes the reception process immediately when the high illuminance state is detected and when the set threshold level is not the maximum value. Is not limited to this. That is, even when the threshold level is not the maximum value, it may be determined whether or not the high illuminance state has been determined continuously for the threshold number of times, and the receiving process may be executed only when it is determined as Yes.
Similarly, in the fifth embodiment, when the high illuminance state is detected, the reception control unit determines whether the high illuminance state has been determined continuously for the threshold number of times even when the threshold level is less than the predetermined level. The receiving process may be performed only when the determination is made and the determination is Yes.

  In the second to fourth embodiments, the threshold setting unit does not change the time threshold if the reception is successful and the illuminance threshold is not the maximum value, but the present invention is not limited to this. For example, even when the illuminance threshold is not the maximum value, it is determined whether or not reception has succeeded a predetermined number of times in succession. If it is determined that the reception has been successful, the time threshold is changed to a value one step shorter. Is also good.

In the above embodiments, the detection of the state of charge is performed at intervals of one second. However, the detection is not limited to this interval, and may be set at intervals of 0.5 seconds, 10 seconds, or 1 minute.
In the above embodiments, the reception is performed in the timekeeping mode during the automatic reception process, and the reception in the positioning mode is performed only during the forced reception process. However, the reception in the positioning mode may be performed by the automatic reception process. Good. For example, the user can select the reception mode in the automatic reception process in advance, and when the positioning mode is selected, the reception is performed in the positioning mode during the automatic reception process, and when the timekeeping mode is selected, the automatic reception is performed. What is necessary is just to receive in a timekeeping mode at the time of a reception process.
When the automatic reception process is performed in the positioning mode, if time information cannot be obtained, it may be determined that reception has failed, or if information necessary for calculating position information cannot be obtained. , It may be determined that the reception has failed. In addition, when reception fails, when no satellite signal can be received, it may be determined that the threshold change condition is satisfied, or when satellite signals cannot be received from at least three GPS satellites 100, It may be determined that the threshold change condition has been met.

  In the above embodiments, when the receiving process is executed, the receiving process is not executed until 0:00 of the next day, but the present invention is not limited to this. For example, if the receiving process is executed before 12:00, the receiving process is not executed until 12:00. If the receiving process is executed after 12:00, the receiving process is executed until 0:00 of the next day. It may not be performed.

In the first to fourth and sixth embodiments, the maximum value of the illuminance threshold is set to 10000 lux, but the present invention is not limited to this. That is, the maximum value may be set to a value higher than the illuminance of general indoor illumination light.
In the fifth embodiment, the predetermined illuminance value to be compared with the illuminance threshold value is set to 10000 lux, but the present invention is not limited to this. That is, the predetermined illuminance value may be set to a value higher than the illuminance by the general illumination light.

  In the fourth embodiment, the threshold setting unit may change the illuminance threshold to a lower value by one step in SD43, and then initialize the time threshold and set it to the minimum value. According to this, when the maximum value is not set as the illuminance threshold, the time required to determine whether the reception condition has been met can be minimized, and the time until the reception processing is executed can be minimized. .

  In the fifth embodiment, the value compared with the illuminance threshold value in SE52 and the value compared with the illuminance threshold value in SE58 are the same predetermined illuminance value, but the present invention is not limited to this. That is, the value compared with the illuminance threshold value in SE52 may be the first predetermined illuminance value, and the value compared with the illuminance threshold value in SE58 may be the second predetermined illuminance value different from the first predetermined illuminance value.

  The electronic device of the present invention is not limited to a wristwatch (electronic timepiece), but is widely applied to a device for receiving a satellite signal transmitted from a position information satellite, such as a mobile phone and a portable GPS receiver used for mountain climbing. Available.

  In each of the above embodiments, the GPS satellite 100 has been described as an example of the position information satellite, but the present invention is not limited to this. For example, satellites used in other global public navigation satellite systems (GNSS) such as Galileo (EU), GLONASS (Russia), and Beidou (China) can be applied as position information satellites. In addition, geostationary satellites such as the geostationary satellite navigation augmentation system (SBAS), and satellites such as the quasi-zenith satellite such as the regional satellite positioning system (RNSS) that can be searched only in a specific area can be applied.

  DESCRIPTION OF SYMBOLS 1 ... Electronic timepiece, 100 ... GPS satellite, 130 ... Secondary battery, 135 ... Solar cell, 41 ... Diode, 42 ... Charge control switch, 421 ... Switching element, 43 ... Charge state detection circuit, 44 ... Voltage detection circuit, 45 GPS receiver circuit (reception unit), 46 clock unit, 47 control circuit, 471 reception control unit, 472 threshold setting unit.

Claims (14)

A receiving unit that receives a satellite signal from a positioning information satellite,
An illuminance detection unit that detects a value related to the illuminance of the emitted light,
Based on the value detected by the illuminance detection unit, it is determined whether or not the duration of the high illuminance state in which the illuminance is equal to or greater than the illuminance threshold is equal to or greater than a time threshold, and the continuation time of the high illuminance state is the time threshold. In the above case, a reception control unit that operates the reception unit to execute a reception process;
A threshold setting unit that sets a value of the illuminance threshold and the time threshold,
The threshold setting unit, when reception has failed in the reception processing, determines that the threshold change condition at the time of reception failure has been met, the illuminance threshold and the time selected according to the value of the set illuminance threshold An electronic device, wherein one of the thresholds is changed to a larger value. A receiving unit that receives a satellite signal from a positioning information satellite,
An illuminance detection unit that detects a value related to the illuminance of the emitted light,
Based on the value detected by the illuminance detection unit, it is determined whether or not the duration of the high illuminance state in which the illuminance is equal to or greater than the illuminance threshold is equal to or greater than a time threshold, and the continuation time of the high illuminance state is the time threshold. In the above case, a reception control unit that operates the reception unit to execute a reception process;
A threshold setting unit that sets a value of the illuminance threshold and the time threshold,
The threshold setting unit,
If the reception failed because the position information satellite could not be captured in the reception process, it is determined that the threshold change condition at the time of reception failure was met, and according to the value of the set illuminance threshold, the illuminance threshold and Changing one of the time thresholds to a larger value,
The electronic device, wherein when the position information satellite is captured in the reception processing but reception fails, the values of the illuminance threshold and the time threshold are maintained. The electronic device according to claim 1 or 2,
The threshold setting unit changes the time threshold to a longer value when the threshold change condition is satisfied and the illuminance threshold is set to a preset maximum value. machine. The electronic device according to claim 3,
The threshold setting unit changes the illuminance threshold to a higher value if the threshold change condition is satisfied and the illuminance threshold is set to a value other than the maximum value. machine. The electronic device according to claim 1 or 2,
The threshold setting unit,
If the threshold change condition is satisfied, and the value of the set illuminance threshold is equal to or greater than a first predetermined illuminance value, and the time threshold is set to a value that is not a preset maximum value, the time Change the threshold to a longer value,
When the threshold value change condition is satisfied, and the value of the set illuminance threshold is equal to or more than the first predetermined illuminance value, and the maximum value is set to the time threshold, the illuminance threshold is set to a higher value. An electronic device characterized by being changed to: The electronic device according to claim 5,
The electronic device, wherein the threshold setting unit sets a predetermined minimum value as the time threshold when the illuminance threshold is changed to a higher value. A receiving unit that receives a satellite signal from a positioning information satellite,
An illuminance detection unit that detects a value related to the illuminance of the emitted light,
Based on the value detected by the illuminance detection unit, it is determined whether or not the duration of the high illuminance state in which the illuminance is equal to or greater than the illuminance threshold is equal to or greater than a time threshold, and the continuation time of the high illuminance state is the time threshold. In the above case, a reception control unit that operates the reception unit to execute a reception process;
A threshold setting unit that sets a value of the illuminance threshold and the time threshold,
The threshold setting unit,
If the reception failed in the receiving process, it is determined that the threshold change condition at the time of reception failure was met,
If the threshold change condition is satisfied, and the position information satellite can be captured in the reception process, the time threshold is changed to a longer value,
An electronic device, wherein the illuminance threshold is changed to a higher value if the threshold change condition is satisfied and the position information satellite cannot be captured in the reception processing. The electronic device according to any one of claims 1 to 7,
The electronic device, wherein the threshold setting unit changes the time threshold to a shorter value when the reception process succeeds a predetermined number of times in succession. The electronic device according to any one of claims 1 to 8,
The electronic device, wherein the threshold setting unit changes the illuminance threshold to a lower value when the reception processing is not performed for a predetermined period without entering the high illuminance state. The electronic device according to claim 9,
The electronic device, wherein the threshold setting unit sets a predetermined minimum value as the time threshold when changing the illuminance threshold to a lower value. The electronic device according to any one of claims 1 to 8,
The threshold setting unit,
Although the high illuminance state is set, the duration of the high illuminance state does not exceed the time threshold, the reception process is not performed for a predetermined period, and the set value of the illuminance threshold Is greater than or equal to a second predetermined illuminance value, the time threshold is changed to a shorter value,
The electronic device, wherein the illuminance threshold is changed to a lower value when the reception process is not performed during the predetermined period without being in the high illuminance state. A method for controlling an electronic device, comprising:
Detecting a value related to the illuminance of the emitted light;
Based on the value detected by the detecting step, it is determined whether or not the duration of the high illuminance state in which the illuminance is greater than or equal to an illuminance threshold is greater than or equal to a time threshold, and the duration of the high illuminance state is greater than or equal to the time threshold. In the above case, a step of executing a reception process of receiving a satellite signal from the position information satellite,
If the reception fails in the reception process, it is determined that the threshold change condition at the time of reception failure has been satisfied, and one of the illuminance threshold and the time threshold selected according to the value of the illuminance threshold that has been set is set as one of the thresholds. And a step of changing the value to a larger value. A method for controlling an electronic device, comprising:
Detecting a value related to the illuminance of the emitted light;
Based on the value detected by the detecting step, it is determined whether or not the duration of the high illuminance state in which the illuminance is greater than or equal to an illuminance threshold is greater than or equal to a time threshold, and the duration of the high illuminance state is greater than or equal to the time threshold. In the above case, a step of executing a reception process of receiving a satellite signal from the position information satellite,
If the reception failed because the position information satellite could not be captured in the reception process, it is determined that the threshold change condition at the time of reception failure was met, and according to the value of the set illuminance threshold, the illuminance threshold and Changing one of the time thresholds to a larger value;
A step of maintaining the values of the illuminance threshold value and the time threshold value when the position information satellite is captured in the reception processing but the reception fails. A method for controlling an electronic device, comprising:
Detecting a value related to the illuminance of the emitted light;
Based on the value detected by the detecting step, it is determined whether or not the duration of the high illuminance state in which the illuminance is equal to or greater than the illuminance threshold is greater than or equal to a time threshold, and the duration of the high illuminance state is equal to or less than the time threshold. In the above case, a step of executing a reception process of receiving a satellite signal from the position information satellite,
If the reception has failed in the reception process, a step of determining that the threshold change condition at the time of reception failure has been met,
If the threshold change condition is satisfied, and the position information satellite can be captured in the reception process, changing the time threshold to a longer value,
Changing the illuminance threshold to a higher value if the threshold change condition is satisfied and the position information satellite cannot be captured in the reception processing. .

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