JP7176207B2 - Electronic devices and methods of controlling electronic devices - Google Patents

Description

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

Conventionally, electronic devices that receive satellite signals from positioning information satellites such as GPS satellites are known to improve the reception success rate by varying the reception start conditions for executing reception processing (for example, Patent Document 1 and 2).

The electronic device of Patent Document 1 determines that the electronic device is exposed to 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 the time threshold, Execute reception processing for receiving satellite signals. Then, when reception fails, the electronic device lengthens the time threshold and tightens the reception start condition.

Similarly to the electronic device of Patent Document 1, the electronic device of Patent Document 2 executes reception processing for receiving a satellite signal when the high illumination state continues for the time threshold. At this time, if the high illuminance state does not continue for the time threshold for a predetermined time, that is, if the reception process for receiving the satellite signal is not executed for a predetermined time, the time threshold is shortened to loosen the reception start condition. do.

JP 2012-150047 A JP 2012-150048 A

However, in the electronic device of Patent Document 1, for example, when strong illumination light is irradiated to the electronic device indoors and reception fails due to an erroneous determination that the electronic device is outdoors, even if the time threshold is increased, the strong illumination light If the irradiation time becomes longer, it may be erroneously determined to be outdoors again, and the reception success rate may not be improved. Also, in this case, since the reception process for receiving the satellite signal is executed, the time threshold does not become shorter as in Patent Document 2. Therefore, if the electronic device is left in such a situation for a long period of time, the time threshold will be maintained at the upper limit.
Normally, the longer the time threshold is set to, such as the upper limit, the higher the reception success rate. For example, it is assumed that a user carrying an electronic device moves from indoors to outdoors, moves outdoors 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 possible to determine that the user is in a high illuminance state and complete the reception process during a certain period of time while the user is moving outdoors. On the other hand, if the time threshold is set to a long value such as the upper limit, it takes a long time to determine that it is in a high illuminance state. In some cases, the electronic device moves from outdoors to indoors during the period from 1 to 10, resulting in failure in reception. That is, reception may fail due to the time threshold being too long.
In this way, even if the reception start conditions are tightened when the reception process fails, and the reception start conditions are loosened when the reception process is not executed for a predetermined time, the reception success rate can be improved depending on the usage conditions. Sometimes I couldn't.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic device and a method of controlling the electronic device that can set reception start conditions according to various usage conditions of the electronic device and improve the reception success rate.

The electronic device of the present invention comprises a receiving unit for receiving a satellite signal from a positioning information satellite, an illuminance detecting unit for detecting a value related to the illuminance of the irradiated light, and based on the value detected by the illuminance detecting unit, the determining whether or not the duration of the high-illuminance state in which the illuminance is equal to or greater than the illumination threshold is equal to or greater than the time threshold, and if the duration of the high-illuminance state is equal to or greater than the time threshold, the receiving unit is operated to perform reception processing; and a threshold setting unit configured to set the value of the time threshold, wherein the threshold setting unit determines whether the reception processing performed with the time threshold set to the upper limit value is not received. If the reception fails, the time threshold is changed to a value shorter than the upper limit, and if the reception process executed with the time threshold set to a time shorter than the upper limit fails to receive , changing the time threshold to a longer value.

Here, the illuminance detection unit may be an illuminance sensor, or if the electronic device includes a solar cell, it may detect the open-circuit voltage of the solar cell as a value related to illuminance.
Further, the case where reception fails means the case where time information or position information cannot be obtained based on the satellite signal.
The upper limit of the time threshold is a value corresponding to the longest time within the 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 longer than the time threshold, the reception control section operates the reception section to perform reception processing.
Then, the threshold value setting unit changes the time threshold value to a time shorter than the upper limit value when the reception process executed with the time threshold value set to the upper limit value fails in reception. Therefore, the time threshold can be maintained at the upper limit value even in a situation where the electronic device is left indoors for a long time in an environment where it is exposed to strong illumination light, that is, in a situation where the electronic device repeatedly fails to receive data. do not have. Therefore, it is possible to prevent reception from failing due to an excessively long time threshold, such as when the user carrying the electronic device moves outdoors for a certain period of time after the electronic device has been left indoors for a long period of time. .
In addition, the threshold setting unit changes the time threshold to a longer value when the receiving process fails when the time threshold is set to a time shorter than the upper limit. 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 the electronic device is momentarily exposed to sunlight near a window in a room.
As described above, according to the present invention, the reception start condition for executing the reception process can be set according to various usage conditions of the electronic device, and the reception success rate can be improved.

The electronic device according to the aspect of the invention has a storage unit that stores a set value of the time threshold set shorter than the upper limit, and the threshold setting unit sets the time threshold to the upper limit. Preferably, the time threshold is changed to the set value if the executed reception process fails to receive.
The set value of the time threshold is assumed to be, for example, a value set when the electronic device is shipped from the factory, such as a value statistically showing a high reception success rate or a median value within a settable range.
According to the present invention, the threshold setting unit changes the time threshold to the setting value stored in the storage unit when the reception process executed with the time threshold set to the upper limit fails in reception. Therefore, the threshold setting unit can, for example, change the time threshold to a value with a statistically high reception success rate, and can improve the reception success rate.

The electronic device according to the aspect of the invention has a storage unit that stores the time threshold value and the reception result in association with each other, and the threshold value setting unit is configured to perform the reception with the time threshold value set to the upper limit value. It is preferable to change the time threshold value to a value shorter than the upper limit value based on the reception result stored in the storage unit when the process fails to receive.
In the storage unit, for example, a time threshold and the number of successful receptions of reception processing executed with the time threshold set are stored in association with each other as a reception result. Examples of reception results include those accumulated and stored after the start of use of the electronic device, and those stored for a certain period of time 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 to receive, 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 above can be changed to the shortest time threshold. For this reason, the threshold setting unit can improve the reception success rate by changing the threshold for the time with the largest number of successful receptions, or by changing it to the shortest time with a predetermined number of successful receptions. It is possible to shorten the time until is executed.

In the electronic device according to the aspect of the invention, the threshold setting unit sets the time threshold to It is preferable to change to a value shorter than the upper limit.
An example of a case where reception fails a predetermined number of times in succession in the reception process is assumed, for example, when an electronic device is left in a room illuminated with strong illumination light for a long period of time.
In such a case, the threshold setting unit determines that reception has failed a predetermined number of times in a row, so the possibility of reception failure due to reasons other than the reception start condition is low, that is, the reception start condition is not appropriate. can be determined to be highly probable. In this case, it can be determined that the reception success rate will not improve even if the time threshold is maintained at the upper limit value, so that the threshold setting unit can improve the reception success rate by 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 setting unit changes the time threshold to a shorter value when the reception process has been successfully performed a predetermined number of times in succession.
If reception is successful for a predetermined number of times in succession in the reception process, it can be determined that the usage is such that reception is likely to be successful. In such a case, even if the time threshold is shortened, that is, even if the conditions for starting reception are loosened, it can be determined that the possibility of immediate failure in reception is low. Therefore, by changing the time threshold to a shorter value by the threshold setting unit, the time required to determine 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 according to the aspect of the invention, if the reception process executed with the time threshold set to the upper limit value fails to acquire the positioning information satellite and reception fails, the The time threshold is changed to a value shorter than the upper limit, and the reception process executed with the time threshold set to a time shorter than the upper limit cannot capture the positioning information satellite and fails in reception. If so, it is preferable to change the time threshold to a longer value.
If the positioning information satellite is acquired but reception fails, it is possible that the reception failed due to a cause other than the reception start conditions although the reception was started outdoors. 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 positioning information satellite could not be captured in the reception process, the cause of the reception failure was, for example, that the electronic equipment executed the reception process when the electronic equipment was irradiated with illumination light indoors. We can conclude 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. . This prevents the reception from failing due to the time threshold being too long.

The electronic device of the present invention preferably has a clock section for keeping internal time, and a time adjustment section for adjusting 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 adjustment unit, and can adjust the internal time based on this time information, so it can be used as an electronic timepiece with high time display accuracy. can.

The present invention provides a control method for an electronic device comprising a receiving unit for receiving satellite signals from a positioning information satellite and an illuminance detecting unit for detecting a value related to the illuminance of light emitted, wherein the illuminance detecting unit detects the detecting a value related to illuminance; determining whether a duration of a high illuminance state in which the illuminance is equal to or greater than an illuminance threshold is equal to or greater than a time threshold based on the value detected by the detecting step; executing a reception process for receiving a satellite signal from a positioning information satellite by the reception unit when the duration of the illuminance state is equal to or greater than the time threshold; determining whether a threshold is set to an upper limit; and if it is determined in the determining step that the time threshold is set to the upper limit, the time threshold is set to be higher than the upper limit. and changing the time threshold to a longer value if the determining step determines that the time threshold is not set to the upper limit value. characterized by
According to the present invention, it is possible to set the reception start condition for executing the reception process according to various usage conditions of the electronic device, thereby improving the reception success rate.

1 is a schematic diagram showing an electronic timepiece according to a first embodiment of the invention; FIG. 1 is a front view of an electronic timepiece according to a first embodiment; FIG. 1 is a cross-sectional view of an electronic timepiece according to a first embodiment; FIG. 2 is a block diagram showing the circuit configuration of the electronic timepiece according to the first embodiment; FIG. 4 is a flowchart showing processing in a control circuit in the first embodiment; FIG. 5 is a diagram for explaining operation timings of state-of-charge detection, open-circuit voltage detection, and reception processing; 4 is a graph showing the relationship between the illuminance of light striking the solar cell of the electronic timepiece and the open-circuit voltage of the solar cell. The figure which shows the relationship between the determination frequency|count and a time threshold value. 9 is a flow chart showing processing in a control circuit according to a second embodiment of the present invention; 9 is a flow chart showing processing in a control circuit according to a third embodiment of the present invention; The figure which shows the relationship between the determination frequency|count and reception success frequency|count in 3rd Embodiment. FIG. 11 is a flow chart showing processing in a control circuit according to a fourth embodiment of the present invention; FIG.

[First embodiment]
An electronic timepiece 1 according to a first embodiment of the invention will be described below with reference to the drawings.
FIG. 1 is a schematic diagram showing an electronic timepiece 1 of this embodiment.
The electronic timepiece 1 is an example of an electronic device, and receives satellite signals from at least one GPS (Global Positioning System) satellite 100 among a plurality of GPS (Global Positioning System) satellites 100 orbiting the earth in a predetermined orbit. It is configured to acquire time information, receive satellite signals from at least three GPS satellites 100, and calculate and acquire position information. Note that the GPS satellites 100 are an example of positioning information satellites, and a plurality of them exist above the earth. Currently, about 30 GPS satellites 100 are orbiting.

[Schematic configuration of electronic timepiece]
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. As shown in FIG.
The electronic timepiece 1 includes an exterior case 30, a cover glass 33, and a back cover . The exterior 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. Ceramic does not shield radio waves because it is non-conductive and has low conductivity. On the inner peripheral side of the bezel 32, a ring-shaped dial ring 35 made of non-conductive resin and a disc-shaped dial 11 made of a non-conductive material such as polycarbonate serve as time display portions. is placed as
On the side surface of the exterior case 30, from the plane center of the dial 11, the A button 2 is located at the 2 o'clock position, the B button 3 is located at the 4 o'clock position, and the crown 4 is located at the 3 o'clock position. ing.

Of the two openings of the exterior case 30, the opening on the front side is closed with a cover glass 33 via a bezel 32, and the opening on the back side is closed with a back cover 34 made of metal. .
A dial ring 35 attached to the inner periphery of the bezel 32, a dial 11 having light transmittance, pointers 21, 22, 23, 24, and pointers 21 to 23 are attached to the inside of the exterior case 30. A pointer shaft 25 (three pointer shafts provided coaxially) and a pointer shaft 26 to which a 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 dial 127, a date dial holder 128, a driving mechanism 140 for driving the pointers 21 to 24, etc. are provided. there is
The pointer shaft 25 is provided along a central axis that passes through the plane center of the exterior case 30 and extends in the front and back directions. A pointer shaft 26 is provided along the central axis through a position shifted in the 6 o'clock direction from the center.

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

The dial 11 is a circular plate that displays the time inside the exterior case 30, and is made of a non-conductive resin or other light-transmissive material. 24, etc., and is arranged on the back side of the dial ring 35.例文帳に追加
A logo 12 is provided on the face side of the dial 11 . The logo 12 is letters, numbers, or marks indicating a product name or a manufacturer's name, and is formed of a non-conductive material such as resin or a conductive material. 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.
Viewing the members constituting the electronic timepiece 1 from a direction perpendicular to the dial 11 is referred to as planar view.
If the logo 12 is made of a conductive material and overlaps with the GPS antenna 110 in a plan view, the logo 12 is placed at a position that does not affect the reception of radio waves, or is formed in a size that does not affect the reception of radio waves. It is desirable to

A solar cell 50 is provided on the back side of the dial 11 . Solar cell 50 is arranged between dial 11 and main plate 125 . When the solar cell 50 is viewed through the dial 11 from the surface side of the dial 11, the light transmittance of the dial 11 is set to about 30% or less, so the dial 11 is not completely transparent. , if the solar cell 50 has a partial color difference, the color difference will be identified. If the partial color difference of the solar cell 50 is slight, the color difference is not perceived. Further, the texture of the entire dial plate 11 when viewed from the surface side of the dial plate 11 is unified. In order to make it difficult for the solar cell 50 to be seen through when the dial 11 is viewed from the front side, a semi-transmissive material is provided between the dial 11 and the solar cell 50 that partially transmits and partially reflects the light. A sheet may be provided.
The solar cell 50 has a plurality of solar cells (not shown) that perform photovoltaic power generation by converting the light energy of light incident through the dial 11 into electric 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 from the solar cell 50, the dial 11 has a high light transmittance and a high decorativeness. make low. Even if the solar cell 50 can be seen through, if the color of the entire solar cell 50 is uniform, the decorativeness is not impaired, so it is possible to increase the light transmittance and obtain a large amount of solar energy. If a large amount of solar energy can be stored in the secondary battery 130 (see FIG. 4), the battery life of the electronic timepiece 1 and functions that consume a lot of current, such as GPS reception, can be used effectively.
A guide plate (not shown) for fixing the solar cell 50 is provided inside the exterior 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 side of the solar cell 50, and the guide plate reinforces the solar cell 50 to reduce warping. The guide plate is made of a non-conductive material such as polycarbonate or a metal plate. When formed of 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 for receiving radio waves is provided on the back side of the solar cell 50 .
GPS satellites 100 transmit satellite signals with right-handed circular polarization. Therefore, the GPS antenna 110 is composed of a patch antenna (also referred to as a microstrip antenna) that has excellent circular polarization characteristics.

A dial receiving ring 126 for holding 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 exterior case 30 . The solar cell 50 is arranged inside the inner peripheral surface of the dial receiving ring 126 in plan view.

A date dial 127 and a date dial holder 128 for holding the date dial 127 are provided between the main plate 125 and the solar cell 50 . The date indicator 127 and the date indicator holder 128 are made of non-conductive resin.

The dial 11, the solar cell 50, the date dial holder 128 and the main 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 for the small calendar windows 19 (see FIG. 2).

The ground plate 125 is made of non-conductive resin and has an attachment portion for the drive mechanism 140 . The drive mechanism 140 is attached to the base plate 125 and covered with the circuit board 120 from the back side. The drive mechanism 140 has a step motor and a train wheel such as gears, and the hands 21 to 24 are driven by the step motor rotating the pointer shafts 25 and 26 via the train wheel.

Circuit board 120 is provided with GPS receiver circuit 45 , control circuit 47 and GPS antenna 110 . The circuit board 120 is also 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 .

[Display Mechanism of Electronic Clock]
As shown in FIG. 2, on the inner circumference side of the dial ring 35 surrounding the outer circumference of the dial 11, a scale dividing the inner circumference into 60 parts is marked. Using this scale, the hand 21 normally displays "seconds", the hand 22 displays "minutes", and the hand 23 displays "hours".
The dial ring 35 is marked with an alphabetic character "Y" at the 12th minute position and an alphabetic character "N" at the 18th minute position. This alphabet indicates the reception (acquisition) result of various information based on the satellite signal received from the GPS satellite 100 (Y: reception (acquisition) success, N: reception (acquisition) failure). The pointer 21 indicates either "Y" or "N" to display the reception result of the satellite signal. The reception result is displayed by pressing the A button 2 for less than one 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 11 . Numerals, alphabetic characters, and symbols are provided on the dial 11 outside the rotation area of the pointer 24, and the pointer 24 indicates the remaining battery level, day of the week, DST ON/OFF, and so on. , information such as light detection by the solar cell 50 is displayed. Note that the indicator 24 normally displays the remaining battery level.

The small calendar window 19 is provided in a rectangular opening in the dial 11, and the numbers displayed on the date wheel 127 can be viewed through the opening. This number represents the "day" of the year, month, and day. The solar cell 50 is also provided with a rectangular opening so as to match the opening of the dial 11 .

In addition, the dial ring 35 has time difference information 36 representing the time difference from Coordinated Universal Time (UTC) along the scale on the inner circumference side with numbers and symbols other than numbers. The numerical time difference information 36 represents an integer time difference, and the symbolic time difference information 36 represents a non-integer time difference. The time difference between the time indicated 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 .
Also, on the bezel 32 provided around the dial ring 35, 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 indicated on the dial ring 35 is displayed. is written together with the time difference information 36 . Here, the notation of the time difference information 36 and the city information 37 is called time zone display. In this embodiment, the number of time zone indications equal to the number of time zones in use all over the world is represented. Note that the notation of the city names shown in FIG. 2 is an example, and the city names may be changed as appropriate according to changes in the time zone.

[Circuit Configuration of Electronic Clock]
FIG. 4 is a block diagram showing the circuit configuration of the electronic timepiece 1. As shown in FIG. As shown in this figure, the electronic timepiece 1 includes a solar cell 50, a secondary battery 130, a GPS receiver circuit 45, a clock section 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. The configuration including the solar cell 50, the state-of-charge detection circuit 43, and the voltage detection circuit 44 is an example of the illuminance detection section of the present invention.

The diode 41 is provided in a path that electrically connects the solar cell 50 and the secondary battery 130, and does not block the current (forward current) from the solar cell 50 to the secondary battery 130. to the solar cell 50 (reverse current). Forward current flows only when the voltage of solar cell 50 is higher than the voltage of secondary battery 130, that is, during charging. Also, a field effect transistor (FET) may be employed instead of the diode 41 .

The charge control switch 42 connects and disconnects the current path from the solar cell 50 to the secondary battery 130, and is provided in the path electrically connecting 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, charging is performed based on the binary control signal CTL3 output from the control circuit 47 so that the battery characteristics do not deteriorate due to overcharging. The control switch 42 is turned off. In this case, the operation of the voltage detection circuit 44, which will be described later, is stopped based on the control signal CTL2 output from the control circuit 47. FIG.

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

The charge state detection circuit 43 operates based on a binary control signal CTL1 that designates the detection timing of the charge state output from the control circuit 47, and detects the state of charge from the solar cell 50 to the secondary battery 130 (charge state ) is detected, and the detection result RS1 is output to the control circuit 47 . The charging state is "charging" or "non-charging", which is detected based on the battery voltage VCC and the PVIN of the solar cell 50 when the charge control switch 42 is on. For example, when the drop voltage of the diode 41 is Vth and the on-resistance of the switching element 421 is ignored, it is determined that "charging" is performed when PVIN-Vth>VCC, and "non-charging" is determined when PVIN-Vth≤VCC. "Charging" can be determined.

In this embodiment, the control signal CTL1 is a pulse signal with a period of 5 seconds, and the charge state detection circuit 43 detects the charge state while the control signal CTL1 is at high level. In other words, the charge state detection circuit 43 repeatedly detects the charge state at intervals 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 power consumption of the state of charge detection circuit 43 . If this reduction is not desired, 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, 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-circuit voltage of the solar cell 50. do. 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 voltage. Further, the voltage detection circuit 44 outputs the open voltage detection result RS2 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 via the GPS antenna 110 to obtain GPS time information and position information.
Although not shown, the GPS receiving circuit 45 includes an RF (Radio Frequency) section that receives satellite signals transmitted from the GPS satellites 100 and converts them into digital signals, and A BB unit (baseband unit) that performs correlation determination and demodulates navigation messages, and information that acquires and outputs GPS time information and location information (positioning information) from the navigation messages (satellite signals) demodulated by the BB unit. obtaining means; Since the navigation message is already known, the explanation is omitted.

The clock unit 46 is an example of a clock unit, and is driven by electric power accumulated in the secondary battery 130 to perform clock processing. In the clocking process, the internal time is clocked, and the drive mechanism 140 is driven to display the time (first time and second time) corresponding to the internal time on the surface of the electronic timepiece 1 .
Here, the internal time kept 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 section 46 is also an example of a time adjustment section.

The control circuit 47 is composed of a CPU that controls the electronic timepiece 1 . The control circuit 47 is connected to the storage section 48 and functions as a reception control section 471 and a threshold setting section 472 by executing various programs stored in the storage section 48 .
The reception control unit 471 operates the GPS reception circuit 45 to perform reception processing when the reception start condition, which is the condition for executing reception, is met. The threshold setting unit 472 sets an illuminance threshold and a time threshold, which constitute the reception start condition and will be described later. The storage unit 48 stores a set value of a time threshold, which will be described later, and the like. Each function will be described in detail in the explanation of the operation of the control circuit 47 below.

[Control circuit operation]
The operation of the control circuit 47 in such an electronic timepiece 1 will be described with reference to the flowchart of FIG. 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 invention.
The control circuit 47 starts control at 00:00:00 every day. First, the reception control unit 471 activates the state-of-charge detection circuit 43 at regular intervals (SA1). In this embodiment, as shown in FIG. 6, the reception control unit 471 outputs the control signal CTL1 at intervals of 5 seconds to operate the state-of-charge detection circuit 43 . When the control signal CTL1 is input, the charging state detection circuit 43 outputs to the control circuit 47 a detection result RS1 indicating whether or not the battery is in the charging state. Therefore, the reception control unit 471 determines whether or not charging is in progress (SA2). Note that 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-charging state]
When the amount of light impinging on the electronic timepiece 1 is low and the solar cell 50 is not generating power, the charging state detection circuit 43 outputs a detection result RS1 indicating “not charging” to the control circuit 47 . In this case, the reception control unit 471 determines that charging is not in progress (SA2: No), and the control circuit 47 outputs a low-level control signal CTL2.
Therefore, if SA2 is determined to be No, the reception control unit 471 can determine that the electronic timepiece 1 is not placed outdoors and is likely not placed in a location suitable for satellite signal reception.

[Control in charging state]
On the other hand, when it is determined in SA2 that the battery is in the charging state (SA2: Yes), the reception control unit 471 activates 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 charge state detection circuit 43 detects that the battery is being charged, the reception control unit 471 outputs the control signal CTL2 at intervals of 5 seconds to activate the voltage detection circuit 44 . At this time, the charge control switch 42 is controlled to be turned off by the control signal CTL 3 from the control circuit 47 , so that the solar cell 50 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 striking 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 related to illuminance in the present invention.
It should be noted that the charge state detection circuit 43 cannot detect the charge state when the charge control switch 42 is in the OFF state. 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. timing is shifted.

In this embodiment, the open-circuit voltage detected by the voltage detection circuit 44 increases as the illuminance on the solar cell 50 increases, as shown in FIG.
Alternatively, a configuration may be used in which the short-circuit current of the solar cell 50 is detected as a value corresponding to the illuminance of the light striking the solar cell 50 instead of the open-circuit voltage of the solar cell 50 . Note that in the configuration for detecting a short-circuit current, as in the configuration for detecting an open-circuit voltage, by electrically disconnecting the solar cell 50 and the secondary battery 130 by turning off the charge control switch 42, the secondary It is necessary to avoid being affected by the battery 130 .
Such open-circuit voltage and short-circuit current are correlated with the output value of solar cell 50 . Therefore, in this embodiment, an open-circuit voltage and a short-circuit current are detected as detection values.
The value related to illuminance is not limited to the detected value of the open-circuit voltage or short-circuit current of the solar cell 50, and may be, for example, a value detected by an illuminance sensor provided separately.

Based on the detection result RS2 output from the voltage detection circuit 44, the reception control unit 471 determines whether or not the detection level corresponding to the open-circuit voltage is equal to or higher than the threshold level continuously for a predetermined number of determination times. Determine (SA4).
The threshold level is set to a value corresponding to a preset illuminance threshold. Normally, the illuminance of light when the solar cell 50 is irradiated under a fluorescent lamp is usually 500 to 1000 lux, whereas the illuminance of light when the solar cell 50 is irradiated with sunlight is usually 3000 lux or more. becomes. Therefore, for example, from the relationship between the open-circuit voltage and the illuminance shown in FIG. set as a threshold level.
Also, the determination count is set to a value corresponding to the time threshold. Here, the relationship between the number of determinations and the time threshold is stored in the storage unit 48 as shown in FIG. 8, for example. Note that the relationship in FIG. 8 shows the case where the open-circuit voltage is detected at intervals of 5 seconds. For example, if the time threshold is 10 seconds, the number of determinations is set to "2".
In the present embodiment, the time threshold can be set in six stages of less than 5 seconds, 5 seconds or more and less than 10 seconds, . . . 25 seconds or more and less than 30 seconds. That is, the number of determinations can be set in six stages from "1" to "6". That is, the upper limit of the time threshold is the number of determinations "6" corresponding to the longest time of 26 seconds or more and less than 30 seconds in the settable range. Also, the lower limit of the time threshold is the number of determinations "1" corresponding to the shortest time of less than 5 seconds within the settable range.
That is, the reception control unit 471 determines whether or not the high illumination state has been continuously determined for the number of times of determination, thereby determining whether or not the duration of the high illumination state is equal to or greater than the time threshold.
Note that the relationship between the determination count 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 value of the number of determinations may increase or decrease. remembered. That is, the storage unit 48 stores "3" as the set value of the time threshold. The setting values stored in the storage unit 48 are, for example, the values when the electronic timepiece 1 was shipped from the factory, the values set by the user according to the user's lifestyle, and the like. A value that is highly convenient for the user is exemplified.

If either SA2 or SA4 is determined to be No, the reception control unit 471 determines whether the current time is 23:59:55 on the day when the control circuit 47 started control (SA5 ). Here, in this embodiment, as shown in FIG. 6, the reception control unit 471 detects the state of charge (SA1) and determines the detection level (SA4) at intervals of 5 seconds. Execute SA5. That is, in a 24-hour period starting at 00:00:00, the internal time is 00:00:00, 00:00:05, 00:00:10, 00:00:15. 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 that period. In this manner, the reception control unit 471 determines whether or not a predetermined period of time has elapsed without performing reception processing. In this case, the predetermined period is a period of 24 hours starting from 00:00:00. Then, when it is determined as No in SA5, the process returns to SA1, and the state of charge detection circuit 43 is activated at regular intervals.

On the other hand, if the result of SA5 is YES, the process is terminated, and the process shifts to a standby state until the next control restart time. Here, the control restart time is 00:00:00 on the next day.

Next, when SA4 determines Yes, the reception control unit 471 activates the GPS reception circuit 45 to start reception processing for receiving satellite signals from the GPS satellites 100 (SA6).
Note that the reception process started at SA6 is an automatic reception process that is automatically performed when it is determined as Yes at SA4. In this automatic reception processing, reception processing is performed in the timekeeping mode. 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 is lengthened. For this reason, it is preferable to leave the electronic timepiece 1 outdoors until signal reception is complete. There is also the risk of it being lost. Therefore, reception in the positioning mode is preferably performed only when the user intentionally performs the reception operation, that is, only during the forced reception process.
On the other hand, in the timekeeping mode, time information can be obtained by receiving a signal from one GPS satellite 100, and the reception processing time can be shortened. Therefore, the receiving process can be executed even if the user does not intend it, and is suitable for automatic receiving process.

The threshold setting unit 472 determines whether or not reception has succeeded in the reception process started at SA6 (SA7).
The GPS receiver circuit 45 first searches for the GPS satellites 100 and detects satellite signals. Then, when the satellite signal is detected (when the GPS satellite 100 is captured), the satellite signal continues to be received and the time information is received. If 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 reception has failed.
Then, when it is determined that the reception is successful (SA7: Yes), the threshold setting unit 472 determines whether or not the reception has been successful continuously for a predetermined number of times (SA8). The predetermined number of times is, for example, three times. Here, in the present embodiment, the reception process is executed once a day when it is determined as Yes in SA4. Therefore, for example, the threshold setting unit 472 determines whether or not the reception process executed once a day has been successful for three consecutive days. At this time, if SA5 is determined to be Yes, that is, if the reception process is not executed within one day, the threshold setting unit 472 does not count the number of successful receptions. For example, if the reception process succeeds on the first and second days, the number of successful receptions is two. After that, if the reception process is not executed on the third day, the number of successful receptions is maintained at two. Then, if the reception process succeeds on the fourth day, the number of successful reception times 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, two times, or may be four times or more.
If it is determined as Yes in SA8, the threshold setting unit 472 decrements the number of determinations by 1, that is, resets the number of determinations so that the number of determinations is reduced 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).

If the determination at SA8 is No, the threshold setting unit 472 determines whether or not the number of determinations is the lower limit (SA11).
If SA11 returns No, the threshold setting unit 472 increments the number of successful receptions by 1, that is, increases the number of successful receptions by one (SA12), and then adjusts the internal time at SA10.
On the other hand, if SA11 returns Yes, SA10 corrects the internal time without changing the number of successful receptions. In other words, when the number of determinations is the lower limit value "1", the number of successful receptions is not changed. never set.

After the internal time is corrected in SA10, the control circuit 47 ends the processing 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).
If the determination is No at SA13, the threshold setting unit 472 increments the number of determinations by 1, that is, resets the number of determinations so that the number of determinations increases by one (SA14). That is, the threshold setting unit 472 changes the time threshold to a longer value when the receiving process fails when the time threshold is set to a time shorter than the upper limit.

On the other hand, if it is determined as Yes in SA13, the threshold setting unit 472 changes the number of determinations to "3", which is the preset value (SA15). That is, when it is determined that reception has failed (SA7: No) and the set number of determinations is the upper limit value “6” (S13: Yes), the threshold setting unit 472 sets the number of determinations to The setting value stored in the storage unit 48 is changed to "3". Here, the set value "3" is a value shorter than the upper limit "6". In other words, if the reception process fails when the time threshold is set to the upper limit, the threshold setting unit 472 changes the time threshold to a value shorter than the upper limit.
After SA14 or SA15, the threshold setting unit 472 resets the number of successful receptions to "0" (SA16). That is, the number of successful receptions is the number of consecutive successful receptions, and if reception fails even once, the number of successful receptions is reset to "0". Then, the control circuit 47 ends the process and shifts to a standby state until the control restart time.

[Action and effect of the first embodiment]
According to this embodiment, the following effects can be obtained.
In this embodiment, the threshold value setting unit 472 changes the time threshold value to a time shorter than the upper limit value when the receiving process executed with the time threshold value set to the upper limit value fails to receive. Therefore, even in a situation where the electronic timepiece 1 is left indoors for a long time in an environment where strong illumination light is emitted, that is, in a situation where the electronic timepiece 1 repeatedly fails to receive data, the time threshold is maintained at the upper limit value. never Therefore, when the user carrying the electronic timepiece 1 moves outdoors for a certain period of time after the electronic timepiece 1 has been left indoors for a long period of time, it is possible to prevent reception from failing due to an excessively long time threshold. can.
Further, if the reception process fails when the time threshold is set to a time shorter than the upper limit, the threshold setting unit 472 changes the time threshold to a longer value. Therefore, for example, it is possible to prevent the reception process from being executed when the electronic timepiece 1 is momentarily illuminated by sunlight, such as by a window in a room.
As described above, according to the present embodiment, the reception start condition for executing the reception process can be set according to various usage conditions of the electronic timepiece 1, and the reception success rate can be improved.

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

In this embodiment, the threshold setting unit 472 changes the time threshold to a shorter value when the reception process succeeds in receiving a predetermined number of times in succession.
Here, if reception is successful for a predetermined number of times in succession in the reception process, it can be determined that the usage is such that reception is likely to be successful. In such a case, even if the time threshold is shortened, that is, even if the conditions for starting reception are loosened, it can be determined that the possibility of immediate failure in reception is low. Therefore, by changing the time threshold to a shorter value by the threshold setting unit 472, the time required to determine whether or not the reception start condition is met can be shortened, and the time until the reception process is executed can be shortened.
Further, in the present embodiment, if SA4 is determined to be Yes, the reception process is executed once a day. Here, users of the electronic timepiece 1 often have a life pattern of moving outdoors every morning when they go to work. In the case of such a user, it is assumed that the reception process will be executed every morning when coming to work. In that case, there is a high possibility that the reception process will be executed in a similar reception environment, and there is a high possibility that SA8 will succeed a predetermined number of times in a row. Therefore, the threshold setting unit 472 can change the time threshold according to the user's lifestyle pattern.

In this embodiment, the time information can be obtained from the satellite signal received by the clock unit 46, and the internal time can be adjusted based on this time information, so that the electronic timepiece 1 can be used with high time display accuracy. .

[Second embodiment]
Next, a second embodiment of the invention will be described with reference to the drawings.
Since the structure of the electronic timepiece 1 of this embodiment is the same as that of the first embodiment, detailed description thereof will be omitted or simplified.

FIG. 9 is a flow chart showing 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 GPS satellites 100 are captured in the reception process but reception fails. 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 resets 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 the determination at SB18 is Yes, it can be determined that there is a possibility that the reception will be successful, so it is determined that the conditions for starting reception need not be strict, and the threshold setting unit 472 maintains the time threshold.

On the other hand, if the determination at SB18 is No, it means that the GPS satellite 100 cannot be captured indoors. It can be determined that there is a possibility that this is due to the execution of processing. In this case, the threshold setting unit 472 changes the time threshold similarly to the first embodiment by performing the processes of SB13 to SB15. In other words, if the reception process executed with the time threshold set to a time shorter than the upper limit fails to capture the GPS satellite 100 and reception fails, the threshold setting unit 472 sets the time threshold to a longer value. change (SB14). Further, if the reception process executed with the time threshold set to the upper limit fails to capture the GPS satellite 100 and reception fails, the threshold setting unit 472 changes the time threshold to the set value (SB15). .

[Action and effect of the second embodiment]
In this embodiment, when the GPS satellite 100 is captured but reception fails, there is a possibility that the reception failed due to a cause other than the reception start condition although the reception was 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 reception start condition.
On the other hand, if the reception process executed with the time threshold set to the upper limit fails to capture the GPS satellite 100 and reception fails, the threshold setting unit 472 changes the time threshold to a value shorter than the upper limit. Therefore, as in the first embodiment, it is possible to prevent reception from failing due to an excessively long time threshold.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to the drawings.
Since the structure of the electronic timepiece 1 of this embodiment is the same as that of the first and second embodiments, detailed description thereof will be omitted or simplified.

FIG. 10 is a flow chart showing processing in the control circuit 47 in the third embodiment.
In contrast to the second embodiment, the present embodiment stores the time threshold value and the reception result in the storage unit 48, and changes the time threshold value based on the reception result stored in the storage unit 48. different. The processes SC1 to SC14, SC17 and SC18 are the same as the processes SB1 to SB14, SB17 and SB18 in the second embodiment.

FIG. 11 is a diagram showing the relationship between the number of determinations and the number of successful receptions in this embodiment.
In this embodiment, in FIG. 10, when it is determined that the reception was successful (SC7: Yes), the threshold setting unit 472 increases the number of reception successes corresponding to the number of determinations when reception is successful by one, It is stored in the storage unit 48 (SC19). For example, in FIG. 11, when it is determined that the reception process executed with the number of determinations set to "3" was successful, the threshold setting unit 472 sets the reception success count corresponding to the number of determinations "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 the reception result.
In the present embodiment, the storage unit 48 stores the cumulative number of successful receptions after the electronic timepiece 1 is started to be used in association with the number of determinations. Note that the number of successful receptions stored in the storage unit 48 is not limited to the cumulative number of times after the start of use of the electronic timepiece 1. For example, 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 (SC13: Yes), the threshold setting unit 472 sets Then, 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). That is, if the reception process executed with the time threshold set to the upper limit fails, 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. Change to a shorter value.

[Action and effect of the third embodiment]
In this embodiment, when the reception process executed under the condition that the time threshold is the upper limit value fails to be received, the threshold setting unit 472 sets the number of times of successful reception stored in the storage unit 48, which is the determination number of times " Change the time threshold to 3'. Therefore, the threshold value setting unit 472 can change the time threshold value to a value that maximizes the number of successful receptions in accordance with the usage of the user, instead of the preset value as in the first and second embodiments. Therefore, the conditions for executing the reception process can be set according to various usage conditions of the electronic timepiece 1, and the reception success rate can be improved.

[Fourth embodiment]
Next, a fourth embodiment of the present invention will be described with reference to the drawings.
Since the structure of the electronic timepiece 1 of this embodiment is the same as that of the first embodiment, detailed description thereof will be omitted or simplified.

FIG. 12 is a flow chart showing processing in the control circuit 47 in the fourth embodiment.
In the present embodiment, in contrast to the first embodiment, if the reception process executed with the time threshold set to the upper limit fails to receive a predetermined number of times in a row, the time The difference is that the threshold is changed to a value shorter than the upper limit. The processing of SD1 to SD16 is the same as the processing of SA1 to SA16 in the first embodiment.

In the present embodiment, when it is determined that the set number of determinations is the upper limit (SD13: Yes), the threshold setting unit 472 determines whether reception has failed consecutively a predetermined number of times. (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, two times, or may be four times or more.
When SD21 determines Yes, the threshold value setting unit 472 changes the number of determinations to a preset value of "3" (SD15).
On the other hand, if SD21 returns No, 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 resets the number of reception failures to "0" (SD23).

[Action and effect of the fourth embodiment]
In the present embodiment, the threshold setting unit 472 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 to receive data a predetermined number of times in succession. change.
As a case in which reception fails a predetermined number of times in succession in the reception process, for example, it is assumed that the electronic timepiece 1 is left in a room illuminated with strong illumination light for a long period of time.
In such a case, the threshold setting unit 472 determines that reception has failed a predetermined number of times in a row. It can be judged that there is a high possibility that it is not. In this case, it can be determined that the reception success rate will not improve even if the time threshold is maintained at the upper limit value. Therefore, the reception success rate can be improved by changing the time threshold to a shorter value by the threshold setting unit 472. .

[Other embodiments]
It should be noted that the present invention is not limited to the above-described embodiments, and includes modifications, improvements, etc. within the scope of achieving the object of the present invention.

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

In each of the above-described embodiments, the state of charge is detected at intervals of 5 seconds, but the interval 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-described embodiments, reception is performed in the timekeeping mode during automatic reception processing, and reception in positioning mode is performed only during forced reception processing. good. For example, the reception mode during automatic reception processing can be selected in advance by the user. It should be received in the timekeeping mode during the reception process.
In addition, when the automatic reception process is performed in the positioning mode, it may be determined that the reception has failed when the information required for calculating the position information cannot be acquired.

In each of the embodiments described above, when the reception process is executed, the reception process is not executed until 0:00 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, and if the reception process is executed after 12:00, the reception process is executed until 0:00 the next day. You may choose not to do so.

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

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

The electronic device of the present invention is not limited to wristwatches (electronic timepieces), but is widely used in devices that receive satellite signals transmitted from positioning information satellites, such as mobile phones and portable GPS receivers used for mountaineering. Available.

In each of the above embodiments, the GPS satellite 100 was described as an example of the positioning information satellite, but the present invention is not limited to this. For example, as the positioning information satellite, a satellite used in other Global Navigation Satellite System (GNSS) such as Galileo (EU), GLONASS (Russia), Beidou (China), etc. can be applied. In addition, geostationary satellites such as geostationary satellite navigation augmentation system (SBAS) and satellites such as quasi-zenith satellites such as regional satellite positioning system (RNSS) that can search only in a specific area can also be applied.
Further, the battery is not limited to the secondary battery 130, and may be a primary battery. In this case, since it is not necessary to use a light-transmissive dial, the dial can be highly decorative. Further, 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.

REFERENCE SIGNS LIST 1 electronic timepiece 100 GPS satellite 50 solar cell 130 secondary battery 41 diode 42 charge control switch 421 switching element 43 charge state detection circuit 44 voltage detection circuit 45 --- GPS receiving circuit (receiving section), 46 --- Clock section (clocking section, time correction section), 47 --- Control circuit, 471 --- Receiving control section, 472 --- Threshold setting section, 48 --- Storage section.

Claims (9)

a receiving unit that receives satellite signals from positioning information satellites;
an illuminance detection unit 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 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 duration of the high illuminance state is equal to or greater than the time threshold. In the above case, a reception control unit that operates the reception unit to perform reception processing;
a threshold value setting unit that sets the time threshold value between the upper limit value corresponding to the longest time and the lower limit value corresponding to the shortest time in the settable range,
The threshold setting unit sets the time threshold to a value shorter than the upper limit and to the lower limit when reception fails in the reception process executed with the time threshold set to the upper limit. If the reception process executed with the time threshold set to a time shorter than the upper limit fails to receive, changing the time threshold to a longer value, changing the time threshold to a shorter value if the reception process executed with the time threshold set to a time longer than the lower limit is successful;
An electronic device characterized by: In the electronic device according to claim 1,
a storage unit that stores a setting value of the time threshold set to a value shorter than the upper limit value and longer than the lower limit value;
The electronic device, wherein 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. . In the electronic device according to claim 1,
a storage unit that associates and stores the time threshold value and the reception result;
The threshold setting unit sets the time threshold based on the reception result stored in the storage unit when the reception process executed with the time threshold set to the upper limit fails in reception. The electronic device is characterized in that the value is changed to a value shorter than the upper limit value and longer than the lower limit value. In 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 consecutive times, and changing the lower limit value to a value longer than the lower limit value. In the electronic device according to any one of claims 1 to 4,
The process of changing the time threshold to a shorter value is executed when the reception process succeeds a predetermined number of times in succession.
An electronic device characterized by: In the electronic device according to any one of claims 1 to 5,
When the reception process executed with the time threshold set to the upper limit fails to capture the positioning information satellite and reception fails, the threshold setting unit sets the time threshold to less than the upper limit. is changed to a shorter value and longer than the lower limit value, and the reception process executed with the time threshold set to a time shorter than the upper limit value fails to acquire the positioning information satellite. An electronic device characterized by changing the time threshold to a longer value if reception fails. In the electronic device according to any one of claims 1 to 6,
a clocking unit that clocks internal time;
and a time adjustment unit that adjusts the internal time based on the received satellite signal. In the electronic device according to any one of claims 1 to 7,
The threshold setting unit sets the time threshold to a value shorter than the upper limit and higher than the lower limit when the reception process executed with the time threshold set to the upper limit fails to receive. An electronic device, wherein the illuminance threshold is maintained when changing to a longer value. A control method for an electronic device comprising a receiving unit for receiving satellite signals from a positioning information satellite and an illuminance detecting unit for detecting a value related to the illuminance of the irradiated light,
detecting a value related to the illuminance by the illuminance detection unit;
Based on the value detected by the detecting step, it is determined whether the duration of the high illumination state in which the illumination is equal to or greater than the illumination threshold is equal to or greater than a time threshold, and the duration of the high illumination state is equal to or greater than the time threshold. In the above case, the step of executing a reception process for receiving a satellite signal from a positioning information satellite by the reception unit;
determining whether or not the time threshold is set to an upper limit value corresponding to the longest time within a settable range when the receiving process by the receiving unit fails to receive;
When the determining step determines that the time threshold is set to the upper limit, the time threshold is set to a value shorter than the upper limit and the shortest time within a settable range. changing to a value longer than the lower limit;
if the determining step determines that the time threshold is not set to the upper limit, changing the time threshold to a longer value;
changing the time threshold to a shorter value if the receiving process executed with the time threshold set to a time longer than the lower limit is successful. How to control equipment.

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