JP2019158799A - Electronic instrument, and electronic instrument control method - Google Patents

Abstract

To provide an electronic instrument and electronic instrument control method that can set a reception start condition in responce to various use situations of an electronic instrument, and can improve a reception success rate.SOLUTION: An electronic instrument comprises: a reception unit that receives a satellite signal from a location information satellite; an illuminance detection unit that detects a value about illuminance of light to be emitted; a reception control unit that determines whether duration of a high illuminance state where the illuminance is equal to or more than an illuminance threshold is equal to or more than a time threshold on the basis of the value detected by the illuminance detection unit, and when the duration of the high illuminance state is equal to or more than the time threshold, operates the reception unit to execute reception processing; and a threshold setting unit that sets a value of the time threshold. The threshold setting unit is configured to: when the reception processing executed in a state with the time threshold set to an upper limit value is failed, change the time threshold to a value shorter than the upper limit value, and when the reception processing executed in a state with the time threshold set to the time shorter than the upper limit value is failed, change the time threshold to a longer value.SELECTED DRAWING: Figure 4

Description

  The present invention relates to an electronic device that receives satellite signals and a method for controlling the electronic device.

  2. Description of the Related Art Conventionally, in an electronic device that receives a satellite signal from a position information satellite such as a GPS satellite, an electronic device that improves a reception success rate by changing a reception start condition for executing a reception process is known (for example, Patent Documents). 1 and 2).

  The electronic device of Patent Document 1 determines that the electronic device is irradiated with sunlight outdoors when a high illuminance state in which the illuminance of light hitting the solar cell is equal to or higher than the illuminance threshold level continues for a time threshold value. A reception process for receiving a satellite signal is executed. And when the said electronic device fails in reception, the said time threshold value is lengthened and reception start conditions are made severe.

  Similarly to the electronic device disclosed in Patent Document 1, the electronic device disclosed in Patent Document 2 performs a reception process of receiving a satellite signal when the high illumination state continues for a time threshold. At this time, if the high illuminance state does not continue for the time threshold value after a predetermined time has elapsed, that is, if the reception process for receiving the satellite signal is not executed for the predetermined time, the time threshold value is shortened and the reception start condition is relaxed. To do.

JP 2012-150047 A JP2012-150048A

However, in the electronic device disclosed in Patent Document 1, for example, if the electronic device is erroneously determined to be outdoors due to irradiation with strong illumination light in the room and reception fails, strong illumination light even if the time threshold is increased. If the time during which the light is irradiated becomes longer, it is erroneously determined as outdoor again, so that there is a possibility that the reception success rate cannot be improved. In this case, since the reception process for receiving the satellite signal is executed, the time threshold is not shortened as in Patent Document 2. Therefore, when the electronic device is left in such a situation for a long period of time, the time threshold value is maintained at the upper limit value.
Normally, the reception success rate increases as the time threshold is set to a long value such as the upper limit value, but the reception success rate may be lowered depending on the use state of the electronic device. For example, it is assumed that a user carrying an electronic device moves from a room to the outdoors, moves outside for a certain period of time, and then enters another building or an underground passage. In such a case, if the time threshold is short within an appropriate range, it may be determined that the user is in a high illuminance state and the reception process may be completed during a certain time during which the user is moving outdoors. On the other hand, if the time threshold is set to a long value such as the upper limit value, the time until it is determined to be in the high illuminance state becomes long. In some cases, the electronic device is moved indoors from the outside to the room until reception is completed and reception fails. That is, reception may fail due to the time threshold being too long.
In this way, if the reception process fails, the reception start condition is tightened, and if the reception process is not executed for a predetermined time, the reception start condition is relaxed. There were cases where it was not possible.

  An object of the present invention is to provide an electronic device and a control method for the electronic device that can set a reception start condition according to various use states of the electronic device and can improve a reception success rate.

  The electronic apparatus according to the present invention includes a receiving unit that receives a satellite signal from a position information satellite, an illuminance detecting unit that detects a value related to the illuminance of irradiated light, and the value detected by the illuminance detecting unit, It is determined whether the duration of the high illuminance state where the illuminance is equal to or greater than the illuminance threshold is equal to or greater than the time threshold. If the duration of the high illuminance state is equal to or greater than the time threshold, the reception unit is activated to perform reception processing. A reception control unit that executes the threshold value setting unit that sets the value of the time threshold value, and the threshold value setting unit receives the reception process that is executed with the time threshold value set to the upper limit value. If it fails, the time threshold is changed to a value shorter than the upper limit, and the reception process executed in a state where the time threshold is set to a time shorter than the upper limit fails , Increase the time threshold to a longer value Characterized in that it further.

Here, the illuminance detection unit may be an illuminance sensor, or may detect an open voltage of the solar cell as a value related to the illuminance when the electronic device includes the solar cell.
Moreover, the case where reception has failed means the case where time information and position information cannot be acquired based on satellite signals.
The upper limit value of the time threshold is a value corresponding to the longest time within a settable range.
In the present invention, when the electronic device is irradiated with light and the duration of the high illuminance state is equal to or greater than the time threshold, the reception control unit operates the reception unit to execute the reception process.
Then, the threshold setting unit changes the time threshold to a time shorter than the upper limit when the reception process executed with the time threshold set to the upper limit fails. Therefore, the time threshold value can be maintained at the upper limit even in a situation where the electronic device is left in an environment where a strong illumination light is irradiated indoors, that is, in a situation where the electronic device repeatedly fails to receive. Absent. Therefore, after the electronic device is left indoors for a long period of time, when the user carrying the electronic device moves outdoors for a certain period of time, it is possible to prevent failure of reception due to the time threshold being too long. .
Moreover, the threshold value setting unit changes the time threshold value to a longer value when the reception process executed with the time threshold value set to a time shorter than the upper limit value fails. That is, the threshold setting unit tightens the conditions for starting reception. Therefore, for example, it is possible to prevent the reception process from being executed when sunlight is instantaneously applied to an electronic device indoors at a window or the like.
As described above, according to the present invention, the reception start condition for executing the reception process can be set according to various usage states of the electronic device, and the reception success rate can be improved.

In the electronic device of the present invention, the electronic device includes a storage unit that stores a setting value of the time threshold that is set shorter than the upper limit, and the threshold setting unit is in a state where the time threshold is set to the upper limit. When the executed reception process fails to receive, it is preferable to change the time threshold to the set value.
As the set value of the time threshold value, for example, a value set when the electronic device is shipped from the factory is assumed, and a statistically high reception success rate or a median value in a settable range is exemplified.
According to the present invention, the threshold value setting unit changes the time threshold value to the setting value stored in the storage unit when the reception process executed with the time threshold value set to the upper limit value fails in reception. Therefore, for example, the threshold setting unit can change the time threshold to a value having a statistically high reception success rate, and can improve the reception success rate.

In the electronic device of the present invention, the electronic device includes a storage unit that stores the time threshold value and the reception result in association with each other, and the threshold value setting unit performs the reception performed in a state where the time threshold value is set to the upper limit value. When the process fails to receive, it is preferable to change the time threshold to a value shorter than the upper limit value based on the reception result stored in the storage unit.
In the storage unit, for example, a time threshold and the number of successful receptions of the reception process executed in a state set to the time threshold are stored in association with each other as a reception result. Examples of the reception result include those accumulated and stored after the use of the electronic device and those stored for a certain period such as one month or one year before starting the reception process.
According to the present invention, when the reception process executed with the time threshold set to the upper limit fails, the threshold setting unit sets the time threshold to be higher than the upper limit based on the reception result of the storage unit. Change to a shorter value. At this time, the threshold setting unit changes the time threshold based on the reception result stored in the storage unit. The time threshold can be changed to the shortest time as described above. Therefore, the threshold setting unit improves the reception success rate by changing to the time threshold with the highest number of successful receptions according to the usage status of the user, or the reception processing by changing to the shortest time more than a predetermined number of times. It is possible to shorten the time until the process is executed.

In the electronic device of the present invention, the threshold setting unit sets the time threshold when the reception process executed in a state where the time threshold is set to the upper limit has failed for a predetermined number of times. It is preferable to change to a value shorter than the upper limit value.
As a case where reception fails continuously for a predetermined number of times in the reception process, for example, a case where an electronic device is left in a room irradiated with strong illumination light for a long period of time is assumed.
In such a case, the threshold setting unit determines that reception has failed continuously a predetermined number of times, so there is a low possibility that reception has failed due to a reason other than the reception start condition, that is, the reception start condition is not appropriate. It can be determined that the possibility is high. In this case, since it can be determined that the reception success rate does not improve even if the time threshold is maintained at the upper limit value, the reception success rate can be improved by the threshold setting unit changing the time threshold to a shorter value.

In the electronic device according to the aspect of the invention, it is preferable that the threshold value setting unit changes the time threshold value to a shorter value when the reception process is successful a predetermined number of times.
If the reception process is successful for a predetermined number of times, it can be determined that the use is easy to succeed. In such a case, even if the time threshold is shortened, that is, even if the condition for starting reception is relaxed, it can be determined that there is a low possibility that reception will fail immediately. Therefore, by changing the time threshold value to a shorter value by the threshold setting unit, the time for determining whether or not the reception start condition is met can be shortened, and the time until the reception process is executed can be shortened.

In the electronic device of the present invention, the threshold setting unit, when the reception process executed in a state where the time threshold is set to the upper limit value fails to capture the position information satellite, the reception fails, The time threshold is changed to a value shorter than the upper limit value, and the reception process executed while the time threshold value is set to a time shorter than the upper limit value fails to acquire the position information satellite and fails to receive. In this case, it is preferable to change the time threshold value to a longer value.
If the position information satellite is captured but reception fails, reception may have started outdoors, but reception may have failed for reasons other than the reception start conditions. In such a case, the reception frequency can be maintained by maintaining the current reception start condition without changing the reception start condition.
On the other hand, if the location information satellite could not be captured by the reception process, the reason for the reception failure is, for example, that the electronic device executed the reception process because the illumination light was irradiated indoors. It can be determined that there is a possibility. In this case, since it can be determined that the reception success rate does not improve even if the time threshold is maintained at the upper limit, the threshold setting unit changes the time threshold to a shorter time if the time threshold is set to the upper limit. . Thereby, it can prevent that reception fails because a time threshold is too long.

In the electronic device of the present invention, it is preferable that the electronic device includes a time measuring unit that measures the internal time, and a time correcting unit that corrects the internal time based on the received satellite signal.
The electronic device of the present invention can acquire time information from the satellite signal received by the time correction unit, and can correct the internal time based on this time information, so that it can be used as an electronic timepiece with high time display accuracy. it can.

The present invention is a method for controlling an electronic device comprising: a receiving unit that receives a satellite signal from a position information satellite; and an illuminance detecting unit that detects a value related to the illuminance of the irradiated light. Based on the value detected by the step of detecting a value related to illuminance and the detecting step, it is determined whether or not the duration of the high illuminance state where the illuminance is equal to or greater than the illuminance threshold is equal to or greater than the time threshold. When the duration of the illuminance state is equal to or greater than the time threshold, the reception unit receives a satellite signal from the location information satellite, and the reception unit by the reception unit fails to receive the time. If it is determined in the step of determining whether or not the threshold value is set to the upper limit value, and the determination step determines that the time threshold value is set to the upper limit value, When the time threshold is changed to a value shorter than the upper limit value and the determination step determines that the time threshold value is not set to the upper limit value, the time threshold value is changed to a longer value. And a step of performing.
According to the present invention, the reception start condition for executing the reception process can be set according to various usage states of the electronic device, and the reception success rate can be improved.

1 is a schematic diagram showing an electronic timepiece according to a first embodiment of the present invention. The front view of the electronic timepiece in 1st Embodiment. Sectional drawing of the electronic timepiece in 1st Embodiment. The block diagram which shows the circuit structure of the electronic timepiece in 1st Embodiment. The flowchart which shows the process in the control circuit in 1st Embodiment. The figure explaining the operation timing of charge condition detection, open circuit voltage detection, and reception processing. The graph which shows the relationship between the illumination intensity of the light which hits the solar cell of an electronic timepiece, and the open circuit voltage of a solar cell. The figure which shows the relationship between the frequency | count of determination and a time threshold value. The flowchart which shows the process in the control circuit of 2nd Embodiment which concerns on this invention. The flowchart which shows the process in the control circuit of 3rd Embodiment concerning this invention. The figure which shows the relationship between the frequency | count of determination in 3rd Embodiment, and the frequency | count of a successful reception. The flowchart which shows the process in the control circuit of 4th Embodiment which concerns on this invention.

[First Embodiment]
Hereinafter, an electronic timepiece 1 according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing an electronic timepiece 1 of the present embodiment.
The electronic timepiece 1 is an example of an electronic device, and receives a satellite signal from at least one GPS satellite 100 among a plurality of GPS (Global Positioning System) satellites 100 orbiting around the earth in a predetermined orbit. Time information is acquired, satellite signals are received from at least three GPS satellites 100, and position information is calculated and acquired. The GPS satellite 100 is an example of a position information satellite, and a plurality of GPS satellites 100 exist over the earth. Currently, 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 showing an outline of the electronic timepiece 1.
The electronic timepiece 1 includes an exterior case 30, a cover glass 33, and a back cover 34. The outer case 30 is configured by fitting a bezel 32 to a cylindrical case 31 (metal case) made of metal. The bezel 32 may be made of metal or ceramic. If it is ceramic, it is non-conductive and has low conductivity, so it does not shield radio waves. On the inner peripheral side of the bezel 32, a ring-shaped dial ring 35 formed of non-conductive resin and a dial 11 formed in a disk shape with a non-conductive member such as polycarbonate are time display portions. Is arranged as.
On the side surface of the exterior case 30, an A button 2 is provided at the 2 o'clock position, a B button 3 is provided at the 4 o'clock position, and a crown 4 is provided at the 3 o'clock position from the plane center of the dial 11. ing.

Of the two openings of the exterior case 30, the opening on the front surface side is closed with a cover glass 33 via a bezel 32, and the opening on the back surface side is closed with a back cover 34 formed of metal. .
A dial ring 35 attached to the inner periphery of the bezel 32, a light-transmitting dial 11, hands 21, 22, 23 and 24, and hands 21 to 23 are attached to the inside of the outer case 30. A pointer shaft 25 (three pointer shafts provided on the same axis) and a pointer shaft 26 to which the pointer 24 is attached are provided. Furthermore, a solar cell 50, a GPS antenna 110, a dial receiving ring 126, a main plate 125, a date indicator 127, a date indicator holder 128, a drive mechanism 140 for driving the hands 21 to 24, and the like are provided. Yes.
The pointer shaft 25 is provided along a central axis that passes through the center of the outer case 30 and extends in the front-back direction. The pointer shaft 26 passes along a position shifted from the center in the 6 o'clock direction, and is provided along the center axis.

  The dial ring 35 has an outer peripheral end in contact with the inner peripheral surface of the bezel 32, a flat plate portion parallel to the cover glass 33, and an inclined portion inclined toward the dial plate 11.

The dial 11 is a circular plate that displays the time inside the outer case 30, is formed of a light-transmitting material such as a resin that is a non-conductive material, and has a pointer 21 to the cover glass 33. 24 and the like, and is disposed on the back side of the dial ring 35.
A logo 12 is provided on the front side of the dial 11. The logo 12 is a letter, number, or mark indicating a product name or manufacturer name, and is formed of a non-conductive member such as a resin or a conductive member. The logo 12 may be formed by printing. If the logo 12 is on the surface side of the solar cell 50, the amount of light incident on the solar cell 50 is reduced. Therefore, the logo 12 is desirably arranged at a position that does not overlap the solar cell 50 in plan view.
Here, viewing the members constituting the electronic timepiece 1 from a direction perpendicular to the dial 11 is referred to as a plan view.
When the logo 12 is formed of a conductive material and overlaps the GPS antenna 110 in a plan view, the logo 12 is disposed at a position that does not affect the reception of radio waves, or has a size that does not affect the reception. It is desirable to do.

A solar cell 50 is provided on the back side of the dial 11. The solar cell 50 is disposed between the dial plate 11 and the ground plate 125. When the solar cell 50 is viewed from the surface side of the dial plate 11 through the dial plate 11, the light transmittance of the dial plate 11 is set to about 30% or less, so that the dial plate 11 is not completely transparent. When there is a partial color difference in the solar cell 50, the color difference is identified. When the partial color difference of the solar cell 50 is slight, the color difference is not recognized. Further, the texture of the entire dial plate 11 when viewed from the front side of the dial plate 11 is unified. In addition, in order to make the solar cell 50 difficult to see through when the dial 11 is viewed from the front side, the semi-transparent that transmits a part of light and reflects a part between the dial 11 and the solar cell 50. A sheet may be provided.
The solar cell 50 includes a plurality of solar cells (not shown) that perform photovoltaic power generation that converts light energy of light that has passed through the dial 11 and entered into electrical energy (electric power). The solar cell 50 also has a light detection function. Details of the solar cell 50 will be described later.
In order to obtain a large amount of electric energy by the solar cell 50, the dial plate 11 has a high light transmittance, and in order to enhance the decoration, the light transmittance is reduced when the solar cell 50 is difficult to see through. make low. Even if the solar cell 50 can be seen through, if the overall color of the solar cell 50 is uniform, the decorativeness is not impaired, so that it is possible to increase the light transmittance and obtain a lot of solar energy. When a larger amount of solar energy can be stored in the secondary battery 130 (see FIG. 4), it is possible to effectively use functions that consume a large amount of current such as the battery life of the electronic timepiece 1 and GPS reception.
A guide plate (not shown) for fixing the solar cell 50 is provided inside the outer case 30. The guide plate is provided with a positioning portion for positioning the solar cell 50. The guide plate is provided on the back surface side of the solar cell 50, the solar cell 50 is reinforced by the guide plate, and warpage is reduced. The guide plate is formed of a polycarbonate or metal plate that is a non-conductive material. When formed with a metal plate, it is formed in a shape that does not overlap with the GPS antenna 110 in plan view so as not to shield radio waves received by the GPS antenna 110.

As shown in FIG. 3, a GPS antenna 110 that receives radio waves is provided on the back side of the solar cell 50.
The GPS satellite 100 transmits a satellite signal with right circular polarization. Therefore, the GPS antenna 110 is configured by a patch antenna (also referred to as a microstrip antenna) having excellent circular polarization characteristics.

  A dial receiving ring 126 that holds the dial 11 is further provided on the back side of the dial 11. The dial receiving ring 126 is made of resin. The dial receiving ring 126 has a ring shape along the inner peripheral surface of the outer case 30. The solar cell 50 is arranged inside the inner peripheral surface of the dial receiving ring 126 in a plan view.

  Between the main plate 125 and the solar battery 50, a date wheel 127 and a date wheel holder 128 that holds the date wheel 127 are provided. The date indicator 127 and the date indicator holder 128 are formed of non-conductive resin.

  The dial plate 11, the solar battery 50, the date dial holder 128, and the base plate 125 are formed with holes through which the pointer shafts 25 and 26 pass. Further, the dial 11 and the solar cell 50 are formed with openings of calendar small windows 19 (see FIG. 2).

  The ground plate 125 is formed of a non-conductive resin and has a mounting portion for the drive mechanism 140. The drive mechanism 140 is attached to the ground plane 125 and is covered with the circuit board 120 from the back side. The drive mechanism 140 includes a step motor and a wheel train such as a gear, and the needles 21 to 24 are driven by the step motor rotating the needle shafts 25 and 26 via the wheel train.

The circuit board 120 is provided with a GPS receiving circuit 45, a control circuit 47, and a GPS antenna 110. The circuit board 120 is connected to a secondary battery 130 (see FIG. 4) such as a lithium ion battery that is charged with power generated by the solar battery 50.
A circuit retainer 123 is provided on the back side of the circuit board 120.

[Electronic watch display mechanism]
As shown in FIG. 2, on the inner peripheral side of the dial ring 35 surrounding the outer peripheral portion of the dial 11, a scale that divides the inner periphery into 60 parts is written. Using this scale, the hand 21 displays “seconds” at normal times, the hand 22 displays “minutes”, and the hand 23 displays “hours”.
The dial ring 35 has an alphabet “Y” at the 12-minute position and an alphabet “N” at the 18-minute position. The letters indicate reception (acquisition) results (Y: reception (acquisition) success, N: reception (acquisition) failure) of various information based on the satellite signal received from the GPS satellite 100. The pointer 21 indicates either “Y” or “N” and displays the reception result of the satellite signal. The reception result is displayed by pressing the A button 2 for less than 1 second.

  The pointer 24 is attached to a pointer shaft 26 provided at a position in the 6 o'clock direction from the plane center of the dial plate 11. Numbers, alphabetic characters, and symbols are provided outside the rotation area of the pointer 24 on the dial 11, and the pointer 24 indicates the remaining battery level, day of the week, DST ON / OFF, and the like. Information such as light detection by the solar cell 50 is displayed. The pointer 24 indicates the remaining battery level in normal times.

  The calendar small window 19 is provided in an opening portion in which the dial 11 is opened in a rectangular shape, and the numbers written on the date wheel 127 are visible from the opening portion. This number represents the “day” of the date. Note that the solar cell 50 is also provided with a rectangular opening so as to match the opening of the dial 11.

Also, the dial ring 35 has time difference information 36 representing a time difference with Coordinated Universal Time (UTC) along a scale on the inner circumference side, which is expressed by numerals and symbols other than numerals. The numerical time difference information 36 represents an integer time difference, and the symbol time difference information 36 represents a time difference other than an integer. The time difference between the time displayed by the hands 21 to 23 and UTC can be confirmed by the time difference information 36 indicated by the hands 21 by pressing the B button 3.
The bezel 32 provided around the dial ring 35 has city information 37 representing the representative city name of the time zone using the standard time corresponding to the time difference of the time difference information 36 written on the dial ring 35. Is also written in the time difference information 36. Here, the notation of the time difference information 36 and the city information 37 is referred to as time zone display. In this embodiment, a time zone display equal to the number of time zones used all over the world is shown. In addition, the notation of the city name shown in FIG. 2 is an example, and the city name may be appropriately changed according to the change of the time zone.

[Circuit configuration of electronic watch]
FIG. 4 is a block diagram showing a circuit configuration of the electronic timepiece 1. As shown in this figure, the electronic timepiece 1 includes a solar battery 50, a secondary battery 130, a GPS receiver 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. In addition, the structure which consists of the solar cell 50, the charge condition detection circuit 43, and the voltage detection circuit 44 is an example of the illumination intensity detection part of this invention.

  The diode 41 is provided in a path that electrically connects the solar battery 50 and the secondary battery 130, and without interrupting the current (forward current) from the solar battery 50 to the secondary battery 130, the secondary battery 130. To the solar cell 50 (reverse direction current) is cut off. The forward current flows only when the voltage of the solar battery 50 is higher than the voltage of the secondary battery 130, that is, during charging. Further, a field effect transistor (FET) may be employed instead of the diode 41.

The charge control switch 42 connects and disconnects a current path from the solar cell 50 to the secondary battery 130, and is a switching provided in a path that electrically connects the solar cell 50 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 the voltage detection circuit 44 described later is stopped based on the 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 turned off when the gate voltage Vg1 is at a high level. The gate voltage Vg1 is controlled by the control circuit 47.

  The charging state detection circuit 43 operates based on a binary control signal CTL1 that specifies the detection timing of the charging state output from the control circuit 47, and the charging state (charging state) from the solar cell 50 to the secondary battery 130 is performed. ) And the detection result RS1 is output to the control circuit 47. The charging state is “charging” or “not charging”, and the detection is performed based on the battery voltage VCC and the PVIN of the solar battery 50 when the charge control switch 42 is on. For example, when the voltage drop of the diode 41 is Vth and the on-resistance of the switching element 421 is ignored, it is determined as “charging” when PVIN−Vth> VCC, and “non-display” when PVIN−Vth ≦ VCC. It can be determined that charging is in progress.

  In the present embodiment, the control signal CTL1 is a pulse signal having a cycle of 5 seconds, and the charge state detection circuit 43 detects the charge state during a period in which the control signal CTL1 is at a high level. That is, the charge state detection circuit 43 repeatedly detects the charge state at a cycle of 5 seconds while maintaining the charge control switch 42 in the connected state.

  The reason why the state of charge is detected intermittently is to reduce the amount of power consumed by the state of charge detection circuit 43. If this reduction is unnecessary, the state of charge may be detected continuously. The charge state detection circuit 43 can be configured using, for example, a comparator, an A / D converter, or 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 50, that is, the open voltage of the solar cell 50. To do. During the period when the voltage detection circuit 44 detects the open circuit voltage, the charge control switch 42 is turned off based on the control signal CTL3 output from the control circuit 47. Further, the voltage detection circuit 44 outputs the detection result RS2 of the open circuit voltage to the control circuit 47.

A GPS receiving circuit 45 as a receiving unit is connected to the GPS antenna 110 and processes satellite signals received through the GPS antenna 110 to acquire 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 it into a digital signal, as in a normal GPS device, and a received signal Information obtained by acquiring GPS time information and position information (positioning information) from the navigation message (satellite signal) demodulated by the BB unit (baseband unit) that demodulates the navigation message by executing correlation determination Acquisition means. Since the navigation message is known, the description is omitted.

The clock unit 46 is an example of a clock unit, and is driven by the power stored in the secondary battery 130 to perform a clock process. In the time measuring process, while measuring the internal time, the drive mechanism 140 is driven to display the time (first time and second time) according to the internal time on the surface of the electronic timepiece 1.
Here, the internal time measured by the clock unit 46 is corrected based on GPS time information and position information acquired by the GPS receiving circuit 45 receiving satellite signals and processing the received satellite signals. That is, the clock unit 46 is also an example of a time correction unit.

The control circuit 47 is composed of a CPU that controls the electronic timepiece 1. The control circuit 47 is connected to the storage unit 48 and functions as a reception control unit 471 and a threshold setting unit 472 by executing various programs stored in the storage unit 48.
The reception control unit 471 operates the GPS reception circuit 45 to execute reception processing when a reception start condition that is a condition for executing reception is met. The threshold setting unit 472 sets an illuminance threshold and a time threshold, which will be described later, constituting the reception start condition. The storage unit 48 stores a setting value of a time threshold, which will be described later. 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. Note that the operation of the control circuit 47 shown in the flowchart of FIG. 5 is an example of the control method of the electronic timepiece 1 of the present invention.
The control circuit 47 starts control every day at 0: 0 minutes 0 seconds. First, the reception control unit 471 operates the charge state detection circuit 43 at a constant cycle (SA1). In the present embodiment, as shown in FIG. 6, the reception control unit 471 outputs a control signal CTL1 at intervals of 5 seconds, and operates the charge state detection circuit 43. When the control signal CTL1 is input, the charging state detection circuit 43 outputs a detection result RS1 indicating whether or not the charging state is present to the control circuit 47. Therefore, the reception control unit 471 determines whether or not charging is in progress (SA2). The charge control switch 42 is switched off only at the timing when the voltage detection circuit 44 is operated, as will be described later.

[Control in non-charged state]
When there is little light hitting the electronic timepiece 1 and no power generation is performed by the solar cell 50, the charging state detection circuit 43 outputs a detection result RS <b> 1 of “not charging” to the control circuit 47. In this case, the reception control unit 471 determines that charging is not being performed (SA2: No), and the control circuit 47 outputs a low-level control signal CTL2.
Therefore, when it is determined No in SA2, the reception control unit 471 can determine that there is a high possibility that the electronic timepiece 1 is not disposed outdoors and is not disposed in a location suitable for receiving satellite signals.

[Control while charging]
On the other hand, the reception control unit 471 activates the voltage detection circuit 44 (SA3) when it is determined in SA2 that the battery is charged (SA2: Yes). At this time, the charge control switch 42 is switched to the off state by the reception control unit 471. That is, the reception control unit 471 outputs a control signal CTL2 at intervals of 5 seconds when the charging state detection circuit 43 detects that charging is in progress, and operates the voltage detection circuit 44. At this time, since the charge control switch 42 is controlled to be turned off by the control signal CTL3 from the control circuit 47, the solar battery 50 and the voltage detection circuit 44 are disconnected from the secondary battery 130. For this reason, the voltage detection circuit 44 can detect the open circuit voltage corresponding to the illuminance of the light hitting the solar cell 50 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 unit 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 and the output timing of the control signal CTL2 to the voltage detection circuit 44 do not match. The timing is shifted.

In the present embodiment, the open circuit voltage detected by the voltage detection circuit 44 increases as the illuminance in the solar cell 50 increases, as shown in FIG.
Moreover, you may use the structure which detects the short circuit current of the solar cell 50 as a value corresponding to the illumination intensity of the light which hits the solar cell 50 instead of the open circuit voltage of the solar cell 50. In the configuration for detecting the short-circuit current, similarly to the configuration for detecting the open-circuit voltage, the secondary battery 130 and the secondary battery 130 are electrically disconnected by turning off the charging control switch 42, so that the secondary battery 130 is electrically disconnected. It is necessary to avoid the influence of the battery 130.
Such an open circuit voltage and a short circuit current have a correlation with the output value in the solar cell 50. Therefore, in this embodiment, an open circuit voltage or a short circuit current is detected as a detection value.
In addition, the value regarding illumination intensity is not restricted to the detection value of the open circuit voltage of a solar cell 50, or a short circuit current, For example, the illumination intensity sensor is provided separately and the value detected by the said illumination intensity sensor may be sufficient.

Based on the detection result RS2 output from the voltage detection circuit 44, the reception control unit 471 determines whether or not it has been continuously determined that the detection level corresponding to the open circuit voltage is equal to or higher than the threshold level for a predetermined number of determinations. Determine (SA4).
The threshold level is set to a value corresponding to a preset illuminance threshold. Usually, the illuminance of light when irradiated to the solar cell 50 under a fluorescent lamp is usually 500 to 1000 lux, whereas the illuminance of light when irradiated to the solar cell 50 is usually 3000 lux or more. It becomes. Therefore, for example, from the relationship between the open circuit voltage and the illuminance shown in FIG. 7, a case where an open circuit voltage of 5.2 V or more corresponding to 3000 lux or more is detected is set to a high illuminance state, and the detection level corresponding to this open circuit voltage is set. It is set as the threshold level.
The number of determinations is set to a value corresponding to the time threshold value. Here, the relationship between the number of determinations and the time threshold value is stored in the storage unit 48 as shown in FIG. 8, for example. In addition, the relationship of FIG. 8 has shown the case where an open circuit voltage is detected at intervals of 5 seconds. For example, when the time threshold is 10 seconds, the number of determinations is set to “2”.
In the present embodiment, the time threshold value can be set to 6 levels of less than 5 seconds, 5 seconds or more and less than 10 seconds,... 25 seconds or more and less than 30 seconds. In other words, the number of times of determination can be set in six stages “1” to “6”. That is, the upper limit value of the time threshold is the number of determinations “6” corresponding to the longest time, which is 26 seconds or more and less than 30 seconds, in the settable range. In addition, the lower limit value of the time threshold is a determination count “1” corresponding to less than 5 seconds, which is the shortest time within the settable range.
That is, the reception control unit 471 determines whether or not the duration of the high illuminance state is equal to or greater than the time threshold by determining whether or not the number of determinations is continuously determined as the high illuminance state.
Note that the relationship between the number of determinations and the time threshold is not limited to the relationship shown in FIG. 8, 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 time threshold is “9 seconds or more and less than 10 seconds”.
As will be described later, the number of determinations increases or decreases. In this embodiment, “3”, which is the number of determinations corresponding to 11 seconds or more and less than 15 seconds, is stored in the storage unit 48 as a setting value. It is remembered. That is, “3” is stored in the storage unit 48 as the set value of the time threshold. The setting value stored in the storage unit 48 is, for example, a value when the electronic timepiece 1 is shipped from the factory, a value set by the user according to the lifestyle, and a value with a statistically high reception success rate. Examples are values that are highly convenient for the user.

  When it is determined No in either SA2 or SA4, the reception control unit 471 determines whether or not the current time is 23:59:55 on the day when the control circuit 47 starts control (SA5). ). Here, in the present embodiment, as shown in FIG. 6, the reception control unit 471 executes detection of the state of charge (SA1) and determination of the detection level (SA4) at intervals of 5 seconds. Execute SA5. That is, in the 24 hour period starting from 0: 0: 0, the internal time is 0: 0: 0, 0: 0: 5, 0: 0: 10, 0: 0: 15 SA5 is executed at intervals of 5 seconds. Thereby, the reception control unit 471 determines whether or not it is 23:59:55 which is the last timing of the 5-second interval in the period. In this way, the reception control unit 471 determines whether or not a predetermined period has elapsed without performing reception processing. In this case, the predetermined period is a period of 24 hours starting from 0: 0: 0. And when it determines with No by SA5, it returns to SA1 and operates the charge condition detection circuit 43 with a fixed period.

  On the other hand, if it is determined Yes in SA5, the process ends, and the process shifts to a standby state until the control restart time when the process is started next. Here, the control resumption time is 0: 00: 0 on the next day.

Next, when it is determined Yes in SA4, the reception control unit 471 activates the GPS reception circuit 45 to start reception processing for receiving a satellite signal from the GPS satellite 100 (SA6).
Note that the reception process started in SA6 is an automatic reception process that is automatically performed when it is determined Yes in SA4. In this automatic reception process, a reception process in the timekeeping mode is performed. That is, in the positioning mode, signals must be received from three or more GPS satellites 100 in order to detect the position, and the reception processing time becomes long. For this reason, it is preferable to place the electronic timepiece 1 outdoors until the signal reception is completed. However, in the automatic reception process, the user does not notice that the signal is being received and moves indoors even during reception. There is also a risk. For this reason, it is preferable that the reception in the positioning mode is performed only when the user intentionally performs a reception operation, that is, only during the forced reception process.
On the other hand, in the timekeeping mode, time information can be acquired even by receiving a signal from one GPS satellite 100, and the reception processing time can be shortened. Therefore, even if the user does not intend, the reception process can be executed, which is suitable for the automatic reception process.

The threshold setting unit 472 determines whether or not the reception is successful by the reception process started in SA6 (SA7).
The GPS receiving circuit 45 first searches for the GPS satellite 100, and the GPS receiving circuit 45 detects the satellite signal. When the satellite signal is detected (when the GPS satellite 100 is captured), the satellite signal is continuously received and the time information is received. When the time information can be received in this way, it is determined that the reception is successful. In other cases, that is, when a satellite signal is not detected by the GPS receiving circuit 45 or when time information cannot be received, it is determined that reception has failed.
Then, when it is determined that the reception has succeeded (SA7: Yes), the threshold setting unit 472 determines whether the reception has succeeded a predetermined number of times (SA8). The predetermined number of times is, for example, three times. Here, in this embodiment, when it is determined Yes in SA4, the reception process is executed once a day. Therefore, for example, the threshold value setting unit 472 determines whether or not the reception process executed once a day has succeeded for three consecutive days. At this time, if it is determined Yes in SA5, that is, if the reception process is not executed during one day, the threshold setting unit 472 does not count the number of successful receptions. For example, if the reception process is successful on the first and second days, the number of successful receptions is two. After that, when the reception process is not executed on the third day, the number of successful receptions is maintained at two times. If the reception process is successful on the fourth day, the number of successful receptions is three. On the other hand, if the reception process fails on the fourth day, the number of successful receptions returns to zero.
Note that the predetermined number of times is not limited to three times, and may be, for example, twice or four times or more.
When it is determined Yes in SA8, the threshold setting unit 472 resets the determination count so that the determination count is decreased by 1, that is, the determination count is decreased by one (SA9). That is, the threshold setting unit 472 changes the time threshold to a shorter value. Then, the clock unit 46 corrects the internal time based on the satellite signal received by the GPS receiving circuit 45 (SA10).

When it is determined No in SA8, the threshold setting unit 472 determines whether the determination count is a lower limit value (SA11).
If it is determined No in SA11, the threshold setting unit 472 increases the number of successful receptions by 1, that is, increases the number of successful receptions by one (SA12), and then corrects the internal time in SA10.
On the other hand, if it is determined Yes in SA11, the internal time is corrected in SA10 without changing the number of successful receptions. That is, when the number of determinations is the lower limit “1”, the number of successful receptions is not changed, so that the number of successful receptions does not reach the predetermined number of three, and the number of determinations is less than the lower limit. It is never set.

  After the internal time is corrected in SA10, the control circuit 47 ends the process and shifts to a standby state until the control restart time.

On the other hand, when it is determined that the reception has failed (SA7: No), the threshold setting unit 472 determines whether or not the set number of determinations is the upper limit value “6” (SA13).
When it is determined No in SA13, the threshold setting unit 472 resets the determination count so as to increase by 1, that is, the determination count increases by one (SA14). That is, the threshold value setting unit 472 changes the time threshold value to a longer value when the reception process executed with the time threshold value set to a time shorter than the upper limit value fails.

On the other hand, when it is determined Yes in SA13, the threshold setting unit 472 changes the determination count to “3” that is a preset setting value (SA15). In other words, the threshold setting unit 472 determines that the reception has failed (SA7: No), and determines that the number of determinations is determined when it is determined that the set number of determinations is the upper limit “6” (S13: Yes). The setting value is changed to “3” which is the setting value stored in the storage unit 48. Here, “3” as the set value is a value shorter than “6” as the upper limit value. That is, the threshold value setting unit 472 changes the time threshold value to a value shorter than the upper limit value when the reception process executed with the time threshold value set to the upper limit value fails.
After SA14 or SA15, the threshold setting unit 472 returns the number of successful receptions to “0” (SA16). That is, the number of successful receptions is the number of times of successful reception. If reception fails even once, the number of successful receptions is returned to “0”. And the control circuit 47 complete | finishes a process and transfers to a standby state until control resumption time.

[Effects of First Embodiment]
According to this embodiment, the following effects can be obtained.
In the present embodiment, the threshold value setting unit 472 changes the time threshold value to a time shorter than the upper limit value when reception processing executed with the time threshold value set to the upper limit value fails. Therefore, the time threshold value is maintained at the upper limit even in a situation where the electronic timepiece 1 is left in an environment where strong illumination light is irradiated indoors, that is, in a situation where the electronic timepiece 1 fails to receive repeatedly. There is nothing to do. Therefore, after the electronic timepiece 1 is left in the room for a long time, when the user carrying the electronic timepiece 1 moves outdoors for a certain period of time, it is possible to prevent reception failure due to the time threshold being too long. it can.
Moreover, the threshold value setting part 472 changes a time threshold value to a longer value, when the reception process performed with the time threshold value set to the time shorter than an upper limit fails. Therefore, for example, it is possible to prevent the reception process from being executed when the electronic timepiece 1 is instantaneously irradiated with sunlight at a window or the like indoors.
As described above, according to the present embodiment, the reception start condition for executing the reception process can be set according to various usage situations of the electronic timepiece 1, and the reception success rate can be improved.

  In the present embodiment, the threshold value setting unit 472 changes the time threshold value to the setting value stored in the storage unit 48 when reception processing executed with the time threshold value set to the upper limit fails. This set value is a value with a statistically high reception success rate, and is a value set at the time of factory shipment. Therefore, the reception success rate can be improved.

In the present embodiment, the threshold value setting unit 472 changes the time threshold value to a shorter value when reception has succeeded a predetermined number of times in the reception process.
Here, when the reception process is successful for a predetermined number of times, it can be determined that the use is easy to succeed in reception. In such a case, even if the time threshold is shortened, that is, even if the condition for starting reception is relaxed, it can be determined that there is a low possibility that reception will fail immediately. For this reason, the threshold setting unit 472 changes the time threshold to a shorter value, so that the time for determining whether or not the reception start condition is met can be shortened, and the time until the reception process is executed can be shortened.
In this embodiment, when it is determined Yes in SA4, the reception process is executed once a day. Here, the user of the electronic timepiece 1 often has a lifestyle pattern that moves outdoors during work every morning. In the case of such a user, it is assumed that the reception process is executed at the time of going to work every morning. Then, it is highly possible that the reception process is executed in the same reception environment, and there is a high possibility that SA8 will succeed continuously a predetermined number of times. Therefore, the threshold setting unit 472 can change the time threshold according to the user's life pattern.

  In the present embodiment, the time information can be acquired from the satellite signal received by the timepiece unit 46, and the internal time can be corrected based on the time information. Therefore, the timepiece 46 can be used as the electronic timepiece 1 with high time display accuracy. .

[Second Embodiment]
Next, 2nd Embodiment of this invention is described based on drawing.
In addition, since the structure of the electronic timepiece 1 of this embodiment is the same as that of the said 1st Embodiment, the detailed description is abbreviate | omitted or simplified.

FIG. 9 is a flowchart showing the processing in the control circuit 47 in the second embodiment.
This embodiment differs from the first embodiment in that the time threshold is maintained when the GPS satellite 100 is captured in the reception process but reception fails. Note that the processing of SB1 to SB15 is the same as the processing of SA1 to SA15 in the first embodiment.

In this embodiment, when it is determined that reception has failed (SB7: No), the threshold setting unit 472 returns the number of successful receptions to “0” (SB17).
Then, the threshold setting unit 472 determines whether or not the GPS satellite 100 exists, that is, whether or not the GPS satellite 100 has been captured (SB18).
If it is determined Yes in SB18, it can be determined that there is a possibility that the reception can be successful. Therefore, it is determined that there is no need to tighten the conditions for starting reception, and the threshold setting unit 472 maintains the time threshold.

  On the other hand, if it is determined No in SB18, since the GPS satellite 100 cannot be captured indoors, the reason for the reception failure is that the electronic timepiece 1 is received because the electronic timepiece 1 is irradiated with strong illumination light indoors. It can be determined that there is a possibility that the process has been executed. In this case, the threshold setting unit 472 changes the time threshold similarly to the first embodiment by performing the processes SB13 to SB15. That is, the threshold value setting unit 472 sets the time threshold value to a longer value when the reception process executed with the time threshold value set to a time shorter than the upper limit value fails to capture the GPS satellite 100 and fails to receive. Change (SB14). Moreover, the threshold value setting unit 472 changes the time threshold value to the set value when the reception process executed with the time threshold value set to the upper limit fails to capture the GPS satellite 100 and fails to receive (SB15). .

[Effects of Second Embodiment]
In the present embodiment, if the GPS satellite 100 is captured but reception fails, reception may have failed due to a cause other than the reception start condition, although reception has started outdoors. In such a case, the threshold setting unit 472 can maintain the reception frequency by maintaining the current reception start condition without changing the condition for starting reception.
On the other hand, the threshold value setting unit 472 changes the time threshold value to a value shorter than the upper limit value when the reception process executed with the time threshold value set to the upper limit value fails to capture the GPS satellite 100 and fails to receive. Therefore, similarly to the first embodiment, it is possible to prevent the reception from failing due to the time threshold being too long.

[Third Embodiment]
Next, 3rd Embodiment of this invention is described based on drawing.
In addition, since the structure of the electronic timepiece 1 of this embodiment is the same as that of the said 1st, 2 embodiment, the detailed description is abbreviate | omitted or simplified.

FIG. 10 is a flowchart showing the processing in the control circuit 47 in the third embodiment.
In the present embodiment, with respect to the second embodiment, the time threshold value and the reception result are stored in the storage unit 48, and the time threshold value is changed based on the reception result stored in the storage unit 48. Different. Note that the processes of SC1 to SC14, SC17, and SC18 are the same as the processes of SB1 to SB14, SB17, and SB18 in the second embodiment.

FIG. 11 is a diagram illustrating the relationship between the number of determinations and the number of successful receptions in the present embodiment.
In this embodiment, when it is determined that the reception is successful in FIG. 10 (SC7: Yes), the threshold setting unit 472 increases the reception success number corresponding to the determination number when the reception is successful by one, The data is stored in the storage unit 48 (SC19). For example, if the threshold setting unit 472 determines in FIG. 11 that the reception process executed with the determination count set to “3” is successful, the reception success count corresponding to the determination count “3”. Is increased from “20” to “21” and stored in the storage unit 48. That is, the number of successful receptions is an example of a reception result.
In the present embodiment, the storage unit 48 stores the cumulative number of successful receptions after the use of the electronic timepiece 1 is started in association with the number of determinations. The number of successful receptions stored in the storage unit 48 is not limited to the cumulative number of times since the use of the electronic timepiece 1 is started. For example, one month or one year before the reception process is started. The number of successful receptions during a certain period may be stored.

  Returning to FIG. 10, in the present embodiment, when the threshold setting unit 472 determines that the set number of determinations is the upper limit value (SC13: Yes), the threshold setting unit 472 is as shown in FIG. In addition, the time threshold value is changed to “3”, which is the number of determinations with the highest number of successful receptions stored in the storage unit 48 (SC20). In other words, the threshold setting unit 472 sets the time threshold to be higher than the upper limit based on the reception result stored in the storage unit 48 when the reception process executed with the time threshold set to the upper limit fails. Change to a shorter value.

[Effects of Third Embodiment]
In the present embodiment, the threshold setting unit 472 is the number of determinations with the highest number of successful receptions stored in the storage unit 48 when the reception process executed under the condition that the time threshold is the upper limit fails. Change the time threshold to “3”. Therefore, the threshold setting unit 472 can change the time threshold to a value with the highest number of successful receptions according to the usage status of the user, instead of the value set in advance as in the first and second embodiments. Therefore, conditions for executing the reception process can be set according to various usage situations of the electronic timepiece 1, and the reception success rate can be improved.

[Fourth Embodiment]
Next, 4th Embodiment of this invention is described based on drawing.
In addition, since the structure of the electronic timepiece 1 of this embodiment is the same as that of the said 1st Embodiment, the detailed description is abbreviate | omitted or simplified.

FIG. 12 is a flowchart showing processing in the control circuit 47 in the fourth embodiment.
In the present embodiment, in contrast to the first embodiment, the threshold value setting unit 472 is configured so that the reception processing executed in a state where the time threshold value is set to the upper limit value fails in reception for a predetermined number of times. The difference is that the threshold is changed to a value shorter than the upper limit. Note that the processing of SD1 to SD16 is the same as the processing of SA1 to SA16 in the first embodiment.

In this embodiment, the threshold setting unit 472 determines whether or not reception has failed continuously for a predetermined number of times when it is determined that the set number of determinations is the upper limit (SD13: Yes). (SD21). The predetermined number of times is, for example, three times. Note that the predetermined number of times is not limited to three times, and may be, for example, twice or four times or more.
When it is determined Yes in SD21, the threshold setting unit 472 changes the determination count to “3”, which is a preset setting value (SD15).
On the other hand, when it is determined No in SD21, the threshold setting unit 472 increases the number of reception failures by 1, that is, increases the number of reception failures by one (SD22).

  Further, when it is determined that the reception is successful (SD7: Yes), the threshold setting unit 472 returns the number of reception failures to “0” (SD23).

[Effects of Fourth Embodiment]
In the present embodiment, the threshold setting unit 472 sets the time threshold to a value shorter than the upper limit when reception processing executed with the time threshold set to the upper limit fails consecutively for a predetermined number of times. change.
As a case where reception fails continuously for a predetermined number of times in the reception process, for example, a case where the electronic timepiece 1 is left in a room irradiated with strong illumination light for a long period of time is assumed.
In such a case, the threshold value setting unit 472 determines that reception has failed continuously a predetermined number of times, so there is a low possibility that reception has failed due to a reason other than the reception start condition, that is, the reception start condition is appropriate. It can be judged that there is a high possibility that it is not. In this case, since it can be determined that the reception success rate does not improve even if the time threshold is maintained at the upper limit value, the threshold setting unit 472 can improve the reception success rate by changing the time threshold to a shorter value. .

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

In the first, second, and fourth embodiments, the threshold value setting unit 472 sets the time threshold value in advance when the reception process executed with the time threshold value set to the upper limit value fails. However, the present invention is not limited to this. For example, the threshold value setting unit 472 may change the time threshold value to a lower limit value or a median value, or may set the time threshold value to a value that is one step shorter than the upper limit value. Good.
Similarly, in the third embodiment, the threshold value setting unit 472 changes the time threshold value to the value with the highest number of successful receptions when the reception process executed with the time threshold value set to the upper limit value fails. However, the present invention is not limited to this. For example, the threshold setting unit 472 may change the time threshold to a value with the highest reception success rate, a value with the number of successful receptions equal to or greater than a predetermined number, and a value shorter than the upper limit. When the threshold setting unit 472 changes the number of determinations based on the reception success rate, the storage unit 48 stores the reception start number in association with the reception success number.

In each of the above embodiments, the state of charge is detected at intervals of 5 seconds. However, the present invention is not limited to this interval, and may be set at intervals of 1 second, 10 seconds, or 1 minute, for example.
In each of the above embodiments, reception is performed in the time measurement mode during automatic reception processing, and reception in the positioning mode is performed only during forced reception processing. However, naturally, reception in the positioning mode may be performed by automatic reception processing. Good. For example, the user can select the reception mode at the time of automatic reception processing in advance, and when the positioning mode is selected, reception is performed in the positioning mode at the time of automatic reception processing, and automatically when the timing mode is selected. What is necessary is just to receive in timekeeping mode at the time of a reception process.
When the automatic reception process is performed in the positioning mode, it may be determined that the reception has failed when the information necessary for calculating the position information cannot be acquired.

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

  In each of the embodiments described above, the high illumination state is set when an open circuit voltage of 5.2 V or more corresponding to an illumination intensity of light of 3000 lux or more is detected, but the present invention is not limited to this. That is, the open circuit voltage corresponding to the threshold level for detecting the high illuminance state may be set to a value higher than the value detected by the illuminance by the general illumination light indoors.

  In each of the above embodiments, the threshold value setting unit 472 changes the time threshold value to a shorter value when it is determined that reception has succeeded a predetermined number of times, but the present invention is not limited to this. For example, the threshold setting unit may change the time threshold to a short value every time reception is successful. Further, the threshold setting unit may change the time threshold to a short value when the reception process is not executed for a predetermined period.

  The electronic device of the present invention is not limited to a wristwatch (electronic timepiece), and is widely used in devices that receive satellite signals 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, as the position information satellite, a satellite used in other global public navigation satellite systems (GNSS) such as Galileo (EU), GLONASS (Russia), and Beidou (China) can be applied. Further, a geostationary satellite such as a geostationary satellite type satellite navigation augmentation system (SBAS) or a satellite such as a regional satellite positioning system (RNSS) that can search only in a specific region such as a quasi-zenith satellite can be applied.
Further, the battery is not limited to the secondary battery 130 but may be a primary battery. In this case, since it is not necessary to use a dial having light transparency, a highly decorative design can be applied to the dial. In this case, an illuminance sensor may be provided as the illuminance detection unit, and the high illuminance state may be determined based on the detection value of the illuminance sensor.

  DESCRIPTION OF SYMBOLS 1 ... Electronic timepiece, 100 ... GPS satellite, 50 ... Solar cell, 130 ... Secondary battery, 41 ... Diode, 42 ... Switch for charge control, 421 ... Switching element, 43 ... Charge state detection circuit, 44 ... Voltage detection circuit, 45 ... GPS reception circuit (reception unit), 46 ... clock unit (timer unit, time correction unit), 47 ... control circuit, 471 ... reception control unit, 472 ... threshold setting unit, 48 ... storage unit.

Claims (8)

A receiver for receiving satellite signals from the position information satellite;
An illuminance detector that detects a value related to the illuminance of the irradiated light;
Based on the value detected by the illuminance detection unit, it is determined whether the duration of the high illuminance state where the illuminance is equal to or greater than the illuminance threshold is equal to or greater than the time threshold, and the duration of the high illuminance state is the time threshold. In the above case, a reception control unit that operates the reception unit to execute reception processing;
A threshold value setting unit for setting the value of the time threshold value,
The threshold setting unit changes the time threshold to a value shorter than the upper limit when the reception process executed in a state where the time threshold is set to the upper limit fails, and the time threshold is set. When the reception process executed in a state where is set to a time shorter than the upper limit value fails in reception, the time threshold value is changed to a longer value. The electronic device according to claim 1,
A storage unit for storing a set value of the time threshold set shorter than the upper limit;
The threshold value setting unit changes the time threshold value to the set value when the reception process executed with the time threshold value set to the upper limit value fails in reception. . The electronic device according to claim 1,
A storage unit that stores the time threshold and the reception result in association with each other;
The threshold setting unit, when the reception process executed in a state where the time threshold is set to the upper limit value fails in reception, sets the time threshold based on the reception result stored in the storage unit. The electronic device is changed to a value shorter than the upper limit value. The electronic device according to any one of claims 1 to 3,
The threshold setting unit sets the time threshold to a value shorter than the upper limit when the reception process executed with the time threshold set to the upper limit fails for a predetermined number of times. Electronic devices characterized by changes. The electronic device according to any one of claims 1 to 4,
The threshold value setting unit changes the time threshold value to a shorter value when the reception process has succeeded a predetermined number of times. The electronic device according to any one of claims 1 to 5,
The threshold value setting unit sets the time threshold value from the upper limit value when the reception process executed in a state where the time threshold value is set to the upper limit value fails to capture the position information satellite and fails in reception. The time threshold is set to a time shorter than the upper limit value, and the reception process executed in a state where the time threshold is set to a time shorter than the upper limit value fails to acquire the position information satellite and fails to receive the time threshold. An electronic device characterized by changing the value to a longer value. The electronic device according to any one of claims 1 to 6,
A timekeeping section for measuring the internal time,
An electronic device comprising: a time correction unit that corrects the internal time based on the received satellite signal. A method for controlling an electronic device comprising: a receiver that receives a satellite signal from a position information satellite; and an illuminance detector that detects a value related to the illuminance of the irradiated light,
Detecting a value related to the illuminance by the illuminance detector;
Based on the value detected by the detecting step, it is determined whether the duration of the high illuminance state where the illuminance is equal to or greater than the illuminance threshold is equal to or greater than the time threshold, and the duration of the high illuminance state is the time threshold. In the above case, a step of executing a reception process of receiving a satellite signal from the position information satellite by the receiving unit;
Determining whether the time threshold is set to an upper limit when the reception process by the reception unit fails in reception;
If the determination step determines that the time threshold is set to the upper limit value, changing the time threshold to a value shorter than the upper limit value;
A step of changing the time threshold value to a longer value when the time threshold value is determined not to be set to the upper limit value by the determining step. .

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