JP6010930B2 - Electronic clock - Google Patents

Description

  The present invention relates to an electronic timepiece, and more particularly to an electronic timepiece having a load that consumes a large amount of power.

Conventionally, a portable timepiece such as a wristwatch is driven by the power of a primary battery or a secondary battery. For this reason, when the battery voltage decreases, the time measuring circuit composed of a crystal resonator, an IC, or the like stops, so that the time measuring function cannot be maintained and the timepiece does not function.
Therefore, there is one that informs the user that the battery voltage is reduced by performing BLD hand movement before the battery voltage drops to a voltage (stop voltage) at which the IC or the like cannot be driven (see, for example, Patent Document 1). ).
The BLD hand movement is a hand movement called a battery low display or a battery life indicator, and in Patent Document 1, the second hand is moved every 2 seconds for 2 seconds. Let it be different from normal hand movement.

  Patent Document 1 is a radio-controlled timepiece that receives a standard radio wave. As shown in FIG. 7 of Patent Document 1, BLD hand movement is performed when the battery voltage is greater than 1.10 V and less than or equal to 1.20 V. When the battery voltage is 1.10 V or less, reception stop and hand movement stop control are performed. That is, as the battery voltage decreases, BLD hand movement is first started, and when the battery voltage further decreases, reception is stopped and hand movement is stopped.

JP 2005-308396 A

  By the way, in the electronic timepiece, the load driven by the power of the battery other than the time measuring function is not limited to the receiving circuit that receives the standard radio wave as in Patent Document 1. For example, in recent years, electronic timepieces have been developed that receive satellite signals from GPS (Global Positioning System) satellites and perform positioning and time adjustment. In this electronic timepiece, a GPS receiving circuit is a load. In addition, a wireless communication circuit such as Bluetooth (registered trademark), a lighting device such as a vibration motor and a backlight, a speaker that emits an alarm, and the like are also loads of the electronic timepiece.

  Since these loads consume a large amount of current, if the load is operated during BLD display as in Patent Document 1, a significant voltage drop occurs, and the battery voltage drops below the voltage required to operate the load. There is a problem that the circuit is stopped due to a drop below the driving voltage of the IC.

For this reason, when the battery voltage falls to a predetermined threshold value, it is conceivable to perform BLD display and load prohibition simultaneously. In this case, the predetermined threshold value needs to be set to a certain level so that the battery voltage does not drop below the stop voltage of the load or IC even when the load is operated.
Therefore, since the BLD display starts at a level where the battery voltage is high to some extent, there is a problem that the period for performing the normal time display is shortened.

  An object of the present invention is to provide an electronic timepiece that can prevent a load from being stopped and can continue normal time display for a long period of time.

  An electronic timepiece according to the present invention includes a secondary battery, a charging means for charging the secondary battery with power, a clocking means for driving the time driven by the power of the secondary battery, and the power of the secondary battery. A time display unit that is driven to display the time, a load that is driven by the power of the secondary battery to execute a function other than timekeeping, a battery voltage detection unit that detects a voltage of the secondary battery, and the secondary battery When the voltage of the secondary battery drops below the first voltage, data indicating that the remaining battery level has dropped is stored in the storage unit that stores the remaining battery level of the secondary battery, and driving of the load starts The first control mode is prohibited, and when the voltage of the secondary battery falls below a second voltage lower than the first voltage, a second notification is made that the stop of the time measuring means is approaching. Control means for executing the control mode. To.

Here, as the load, for example, a GPS receiving circuit that receives GPS satellite signals, a radio wave receiving circuit that receives standard radio waves, a wireless communication circuit that transmits and receives bidirectionally such as Bluetooth, a backlight and illumination using LEDs, etc. Various devices driven by electric power such as a device, a vibration motor, and a speaker can be exemplified. In short, the load of the present invention is various devices that are incorporated in an electronic timepiece to realize various functions other than the time counting function, and in particular, is a device that consumes more power than the time measuring means and the time display means. preferable.
The charging means may be any means that charges the secondary battery with power. For example, the charging means may be a device connected to an external power source by wire or wirelessly to receive power supply, or incorporated in an electronic timepiece. Various power generation means such as a solar cell or a generator using a rotating weight may be used.

According to the present invention, when the voltage of the secondary battery is detected and the voltage is less than the first voltage and greater than or equal to the second voltage, the control means executes the first control mode. In the first control mode, the control means stores data indicating that the remaining battery level is reduced, for example, “E” indicating “Empty” in the storage unit that stores the remaining battery level. Further, the control unit prohibits the start of driving the load. For this reason, it is possible to prevent a state in which the driving of the load must be stopped due to a significant drop in the battery voltage. Furthermore, since data indicating that the remaining battery level has been reduced is stored in the remaining battery level storage unit, if the remaining battery level is displayed based on the data stored in this storage unit, the secondary battery is indicated to the user. You can also encourage charging.
In the first control mode, the driving start of the load is prohibited, but the driving of the time measuring means and the time display means is not prohibited, so that the normal time display can be continued. Therefore, even during execution of the first control mode, the time display function of the electronic timepiece can be continued for a long time and can be used as an electronic timepiece for a long time.

Further, when the voltage of the secondary battery is detected and the voltage is less than the second voltage, the control means executes the second control mode. In this second control mode, it is possible to notify the user that the state in which the timekeeping function cannot be maintained, that is, the state in which the timekeeping means must be stopped, is approaching, so that the user can be urged to charge. In the second control mode, since the drive of the load is also prohibited, the battery voltage is not significantly reduced by starting the drive of the load. Therefore, the voltage of the secondary battery can be prevented from decreasing to a level at which the timekeeping function cannot be maintained, and the usability of the electronic timepiece is not impaired.
Further, in the present invention, if the remaining amount of the secondary battery is displayed in the first control mode and the notice is displayed in the second control mode, the user can check whether the user is operating in the first control mode. It can be easily grasped whether it is operating in the control mode, and also in this respect, it is possible to provide an easy-to-use electronic timepiece.

  In the electronic timepiece of the present invention, the electronic timepiece includes a remaining amount display means for displaying a remaining battery capacity of the secondary battery, and a notice display means for notifying the stop of the timing means, wherein the time display means includes a second hand, When the first control mode is executed, the remaining amount display means uses a pointer different from the second hand as an indicator hand to display the remaining battery level, and the notice display means has the second control mode in the second control mode. When executed, the second hand is preferably operated with a different hand movement from a normal hand movement.

According to the present invention, since the indicator hand for displaying the remaining amount and the second hand for displaying the notice are separately provided, each of the first control mode and the second control mode is provided by the remaining amount display means and the notice display means. The status can be displayed clearly. For this reason, the user can easily grasp the state (control mode) of the electronic timepiece, and can easily confirm whether the electronic watch is in a state that requires charging, thereby improving usability.
Furthermore, in the notice display state (second control mode), since the second hand is moved in a state different from the normal hand movement, for example, a two-second movement, the user can easily determine whether or not the second control mode is being executed. Can grasp.

  In the electronic timepiece of the present invention, the electronic timepiece includes a remaining amount display means for displaying a remaining battery capacity of the secondary battery, and a notice display means for notifying the stop of the timing means, wherein the time display means includes a second hand, The remaining amount display means uses the second hand as an indicator hand for displaying the remaining battery level when the first control mode is executed, and the notice display means displays the second control mode when the second control mode is executed. It is preferable that the second hand is operated with a different hand movement from a normal hand movement.

Since the second hand is used for both the remaining amount display and the notice display, the number of parts can be reduced and the cost can be reduced as compared with the case where an indicator hand different from the second hand is provided.
Furthermore, in the notice display state (second control mode), since the second hand is moved in a state different from the normal hand movement, for example, a two-second movement, the user can easily determine whether or not the second control mode is being executed. Can grasp.

  In the electronic timepiece of the invention, the electronic timepiece includes a button, and the control unit operates the remaining amount display unit when the button is pressed during execution of the first control mode, and based on data stored in the storage unit. It is preferable to display the remaining battery level.

  If the remaining battery level is displayed only when the user operates the button, it can be displayed only when the user wants to check the remaining battery level information. For this reason, the remaining amount display means can be used for displaying other information (seconds and days of the week) in normal times. Therefore, the second hand, the day of the week hand, etc. can be used as the remaining amount display means, the number of parts can be reduced, and the cost can be reduced.

  In the present invention, it is preferable that the control means does not update the display of the battery remaining amount by the remaining amount display means during the operation of the load.

While a load such as a GPS receiver circuit is operating, the battery voltage also decreases significantly over time. For this reason, if the display of the remaining battery level is updated while the load is being driven, the user may feel anxious about a decrease in the battery voltage.
On the other hand, in the present invention, since the display of the remaining battery level is not updated while the load is being driven, it is possible to prevent the user from being anxious.

  In the present invention, it is preferable that the control means shortens a battery voltage detection interval by the battery voltage detection means during operation of the load as compared to a detection interval when the load is not operating.

  During the operation of the load, for example, during the reception process by operating the GPS receiver circuit, the detection interval of the battery voltage is shortened, so that the voltage can be detected by quickly following the voltage change due to the operation of the load. . For this reason, it is possible to immediately detect that the battery voltage has dropped below a predetermined value, and to stop the operation of the load. Therefore, since the operation of the load is continued, the battery voltage can be prevented from greatly decreasing and the time measuring means being stopped. Thereby, the timekeeping function by the timekeeping means can be maintained at a minimum, and the use as an electronic timepiece can be continued.

  In the electronic timepiece of the invention, when the voltage of the secondary battery detected by the battery voltage detection means during operation of the load decreases below a third voltage lower than the first voltage. It is preferable to stop the operation of the load.

Stopping the load operation when the battery voltage drops below the third voltage during the operation of the load prevents the battery voltage from drastically decreasing and the timing means from stopping because the load operation was continued. it can. Thereby, the timekeeping function by the timekeeping means can be maintained at a minimum, and the use as an electronic timepiece can be continued.
The third voltage may be a voltage lower than the first voltage, and specifically, it may be set to a voltage value at which the operation of the load cannot be continued. For this reason, the third voltage is determined by the type of load, and may be higher or lower than the second voltage.

  In the present invention, the charging unit includes a charging state detecting unit that detects whether the secondary battery is in a charging state in which electric power is charged or in a non-charging state, and the control unit includes the charging unit. When the means is in a charged state, the battery voltage detection interval by the battery voltage detecting means is preferably made longer than that in the non-charged state.

While the secondary battery is being charged, the voltage temporarily increases due to the internal resistance of the battery. For this reason, until the charging time continues for a certain time, the detected voltage becomes higher than the actual voltage, and the remaining battery level (battery capacity) also becomes the apparent battery capacity.
For this reason, in the present invention, the detection interval of the battery voltage is made longer than that in the non-charged state. Therefore, the battery voltage can be detected after the charging process is continued for a certain period of time. The voltage error can also be reduced. Therefore, the detection accuracy of the battery voltage can be improved as compared with the case where the detection interval of the charged state is the same as that of the non-charged state. Therefore, the first control mode and the second control mode can be appropriately executed.

  The electronic timepiece of the invention includes a charging state detecting unit that detects whether the charging unit is in a charging state in which the secondary battery is charged with power or in a non-charging state, and the control unit includes When the charging unit is in a charged state, it is preferable to stop the battery voltage detecting operation by the battery voltage detecting unit.

  According to the present invention, since the battery voltage detection operation is stopped in the charged state, a voltage that temporarily increases during charging is not detected. For this reason, it can prevent performing each control mode based on the detection voltage with a big error with an actual voltage value.

  In the electronic timepiece according to the aspect of the invention, the charging unit includes a solar cell, and includes an open voltage detection unit that detects an open voltage of the solar cell, and the control unit is configured such that the open voltage is equal to or higher than a set value. It is preferable to stop the battery voltage detecting operation by the battery voltage detecting means.

If a solar cell is used as the charging means, the secondary battery can be charged by generating electric power by applying light from the sun or a lighting device to the solar cell. For this reason, the user can easily charge the secondary battery when confirming the decrease in the remaining battery level by the remaining amount display means.
Moreover, since the open voltage of the solar cell is detected by the open voltage detection means, the intensity of light hitting the solar cell and the magnitude of the charging current can be grasped. And when an open circuit voltage is as large as a setting value or more, a charging current also becomes large and a battery voltage becomes high temporarily. In this case, since the battery voltage detection operation is stopped, a voltage that temporarily increases due to a large charging current is not detected. For this reason, it can prevent performing each control mode based on the detection voltage with a big error with an actual voltage value.

It is a top view which shows the electronic timepiece of 1st Embodiment of this invention. It is a schematic sectional drawing of the said electronic timepiece. It is a block diagram which shows the circuit structure of the said electronic timepiece. It is a flowchart which shows the voltage detection process in 1st Embodiment. It is a flowchart which shows the process in operation | movement of a GPS receiving circuit. It is a graph which shows the relationship between a battery voltage and battery capacity. It is a figure which shows the relationship between a battery voltage, a battery capacity, the remaining amount level instruct | indicated with an indicator hand, the hand operation mode of a second hand, and a duration. It is a graph which shows the relationship between the elapsed time from the operation start time of a GPS receiving circuit, and the change of a battery voltage. It is a flowchart which shows the voltage detection process in 2nd Embodiment. It is a figure explaining the timing of the charge condition detection and battery voltage detection in 2nd Embodiment. It is a flowchart which shows the voltage detection process in 3rd Embodiment. It is a flowchart which shows the voltage detection process in 4th Embodiment. It is a top view which shows the electronic timepiece in 5th Embodiment. It is a top view which shows the electronic timepiece in 6th Embodiment. It is a top view which shows the electronic timepiece in 7th Embodiment.

[First Embodiment]
Hereinafter, a first embodiment which is one of the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment described below is a preferred specific example of the present invention, and thus various technically preferable limitations are given. However, the scope of the present invention is particularly limited in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

[Structure of electronic watch]
FIG. 1 is a plan view of an electronic timepiece 1 including a satellite signal reception device (GPS reception device) according to a first embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view of the electronic timepiece 1. As is clear from FIG. 1, the electronic timepiece 1 is a wristwatch (electronic timepiece) that is worn on the wrist of the user, and includes a dial 11 and hands 12, and measures the time and displays it on the surface. Most of the dial plate 11 is formed of a non-metallic material (for example, plastic or glass) that easily transmits light and microwaves in the 1.5 GHz band. The pointer 12 is provided on the surface side of the dial 11. The pointer 12 includes a second hand 121, a minute hand 122, and an hour hand 123 that rotate about the rotary shaft 13, and is driven by a step motor through a gear.

In the electronic timepiece 1, processing according to manual operation of the crown 14, the button 15, and the button 16 is executed. Specifically, when the crown 14 is operated, a manual correction process for correcting the display time according to the operation is performed.
Further, when the button 15 is pressed for a long time (for example, a time of 3 seconds or more), a reception process for receiving a satellite signal is executed. The electronic timepiece 1 also has an automatic reception function for automatically receiving a satellite signal at a preset time.
Further, when the button 16 is pressed, a switching process for alternately switching the reception mode to the time measurement mode or the positioning mode is executed. At this time, when the timekeeping mode is set, the second hand 121 moves to the “Time” position (5 second position), and when the positioning mode is set, the second hand 121 is set to the “Fix” position ( Move to the 10 second position). For this reason, the user can easily confirm the set reception mode.

When the button 15 is pressed for a short time, a result display process for displaying the result of the previous reception process is performed. For example, when the reception is successful in the time measurement mode, the second hand 121 moves to the position “Time” (5 second position), and when the reception is successful in the positioning mode, the second hand 121 is “Fix” (10 second position). ) Position. In the case of reception failure, the second hand 121 moves to the “N” position (20-second position).
Note that these instructions by the second hand 121 are also performed during reception. That is, the second hand 121 moves to the “Time” position (5 second position) during reception in the timekeeping mode, and the second hand 121 moves to the “Fix” position (10 second position) during reception in the positioning mode. When the GPS satellite cannot be captured, the second hand 121 moves to the “N” position (20-second position).

  The electronic timepiece 1 further includes an indicator hand 61 that is a remaining amount display means 60. The indicator needle 61 is disposed on the 6 o'clock side of the rotary shaft 13 of the pointer 12. The role of the indicator needle 61 will be described later.

  As shown in FIG. 2, the electronic timepiece 1 includes an outer case 17 made of a metal such as stainless steel (SUS) or titanium. The exterior case 17 is formed in a substantially cylindrical shape. A surface glass 19 is attached to the opening on the surface side of the outer case 17 via a bezel 18. The bezel 18 is made of a non-metallic material such as ceramics in order to improve satellite signal reception performance. A back cover 20 is attached to the opening on the back side of the exterior case 17. In the exterior case 17, a movement 21, a solar cell 22, a GPS antenna 23, a secondary battery 24, and the like are arranged.

The movement 21 includes a step motor and a wheel train 211. The step motor is composed of a motor coil 212, a stator, a rotor, and the like, and drives the pointer 12 via the train wheel 211 and the rotating shaft 13.
A circuit board 25 is disposed on the rear cover 20 side of the movement 21. The circuit board 25 is connected to the antenna board 27 and the secondary battery 24 via the connector 26.

  Mounted on the circuit board 25 are a GPS receiving circuit 30 including a receiving circuit for processing satellite signals received by the GPS antenna 23, a control circuit 40 for performing various controls such as drive control of a step motor, and the like. The GPS receiving circuit 30 and the control circuit 40 are covered with a shield plate 29 and are driven by electric power supplied from the secondary battery 24.

  The solar cell 22 is a photovoltaic element that performs photovoltaic generation to convert light energy into electrical energy. The solar cell 22 includes an electrode for outputting generated power, and is disposed on the back side of the dial 11. Since most of the dial plate 11 is made of a material that easily transmits light, the solar cell 22 can receive light transmitted through the surface glass 19 and the dial plate 11 and perform photovoltaic power generation.

The secondary battery 24 is a power source for the electronic timepiece 1 and accumulates electric power generated in the solar cell 22. Therefore, since the secondary battery 24 is charged by the solar cell 22, the solar cell 22 constitutes a charging means in this embodiment.
In the electronic timepiece 1, the two electrodes of the solar cell 22 and the two electrodes of the secondary battery 24 can be electrically connected to each other. At the time of connection, the secondary battery 24 is generated by the photovoltaic power generation of the solar cell 22. Charged. In the present embodiment, a lithium ion battery suitable for a portable device is used as the secondary battery 24. However, a lithium polymer battery or other secondary battery may be used, or a power storage different from the secondary battery. A body (for example, a capacitor) may be used.

  The GPS antenna 23 is an antenna that receives microwaves in the 1.5 GHz band, and is disposed on the back side of the dial 11 and mounted on the antenna substrate 27 on the back cover 20 side. In the direction orthogonal to the dial plate 11, the portion of the dial plate 11 that overlaps the GPS antenna 23 is formed of a material that easily transmits microwaves in the 1.5 GHz band (for example, a non-metallic material with low conductivity and low permeability). Has been. Further, the solar cell 22 having electrodes is not interposed between the GPS antenna 23 and the dial 11. Therefore, the GPS antenna 23 can receive the satellite signal transmitted through the surface glass 19 and the dial 11.

  By the way, the closer the distance between the GPS antenna 23 and the solar cell 22 is, the more the GPS antenna 23 and the metal member in the solar cell 22 are electrically coupled to generate a loss, or the radiation pattern of the GPS antenna 23 changes to the solar cell 22. It gets blocked and gets smaller. For this reason, in the embodiment, the distance between the GPS antenna 23 and the solar cell 22 is arranged to be equal to or greater than a predetermined value so that the reception performance does not deteriorate.

  The GPS antenna 23 is arranged so that the distance from the metal member other than the solar cell 22 is also a predetermined value or more. For example, when the exterior case 17 and the movement 21 are made of a metal member, the GPS antenna 23 is arranged such that both the distance to the exterior case 17 and the distance to the movement 21 are equal to or greater than a predetermined value. As the GPS antenna 23, a patch antenna (microstrip antenna), a helical antenna, a chip antenna, an inverted F antenna, or the like can be employed.

  The GPS receiving circuit 30 is a load driven by the electric power stored in the secondary battery 24. When each time driving, the GPS receiving circuit 30 attempts to receive a satellite signal from the GPS satellite through the GPS antenna 23 and succeeds in receiving it. Supplies the acquired information such as the trajectory information and the GPS time information to the control circuit 40, and supplies information to that effect to the control circuit 40 if it fails. Note that the configuration of the GPS receiving circuit 30 is the same as the configuration of a known GPS receiving circuit, and a description thereof will be omitted.

  FIG. 3 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 cell 22 as a charging means, a secondary battery 24, a GPS receiving circuit 30 as a load, a control circuit 40 as a control means, a diode 41, a charging A control switch 42, a power generation state detection circuit 43 that is a charge state detection means, an open voltage detection circuit 44 that is an open voltage detection means, a battery voltage detection circuit 45 that is a battery voltage detection means, a time measurement means 51, Time display means 52, remaining amount display means 60, and notice display means 70 are provided.

The control circuit 40 is composed of a CPU for controlling the electronic timepiece 1 including a satellite signal receiving device. As will be described later, the control circuit 40 controls the GPS reception circuit 30 to execute reception processing. The control circuit 40 includes a storage unit 40A for storing the remaining amount level of the secondary battery 24 based on the detected batteries voltage battery voltage detection circuit 45.
Further, the control circuit 40 controls the time measuring means 51 and the time display means 52 to perform the time measuring process and the time display process.
Further, the control circuit 40 controls the operation of the charge control switch 42, the power generation state detection circuit 43, the open voltage detection circuit 44, the battery voltage detection circuit 45, the remaining amount display means 60, and the notice display means 70.

The diode 41 is provided in a path that electrically connects the solar cell 22 and the secondary battery 24, and without interrupting the current (forward current) from the solar cell 22 to the secondary battery 24, the secondary battery 24. To the solar cell 22 (reverse current) is cut off. The forward current flows only when the voltage of the solar cell 22 is higher than the voltage of the secondary battery 24, that is, during charging. The diode 41 prevents current from flowing from the secondary battery 24 to the solar cell 22 when the voltage of the solar cell 22 becomes lower than that of the secondary battery 24.
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 22 to the secondary battery 24, and is a switching provided in a path that electrically connects the solar cell 22 and the secondary battery 24. It has an element. When the switching element transitions from the off state to the on state, it is turned on (connected), and when the switching element transitions from the on state to the off state, it is turned off (disconnected).
For example, the charging control switch 42 is turned off when the battery voltage of the secondary battery 24 exceeds a predetermined value so that the battery characteristics do not deteriorate due to overcharging.

  The switching element is a p-channel transistor, and is turned on when the gate voltage is at a low level, and turned off when the gate voltage is at a high level. The control circuit 40 controls the gate voltage.

  The power generation state detection circuit 43 operates based on a control signal that specifies the detection timing of the power generation state (charging state), detects the charging state from the solar cell 22 to the secondary battery 24, and sends the detection result to the control circuit 40. Output. The detection result is either “power generation state (charged state)” or “non-power generation state (non-charged state)”. This detection result is determined based on the battery voltage VCC and the PVIN of the solar cell 22 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 is ignored, it is determined as “charged state” when PVIN−Vth> VCC, and “non-charged” when PVIN−Vth ≦ VCC. State ".

  In the present embodiment, the control signal is a pulse signal having a cycle of 1 second, and the power generation state detection circuit 43 detects the state of charge in a period in which the control signal is at a high level. That is, the power generation state detection circuit 43 repeatedly performs the detection of the charge state at a cycle of 1 second 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 power generation state detection circuit 43. If this reduction is unnecessary, the state of charge may be detected continuously. The power generation state detection circuit 43 can be configured using, for example, a comparator, an A / D converter, or the like.

The open-circuit voltage detection circuit 44 operates based on a control signal designating the voltage detection timing, and the terminal voltage PVIN of the solar cell 22, that is, the solar cell 22 during the period when the charge control switch 42 is turned off by this control signal. The open circuit voltage is detected. The open circuit voltage detection circuit 44 outputs the detection result of the open circuit voltage to the control circuit 40.
The battery voltage detection circuit 45 measures the battery voltage VCC of the secondary battery 24.

The time measuring means 51 includes a reference signal source that outputs a reference signal, such as a crystal resonator, and a counter that counts the reference signal and measures time. In addition, when the time information is received by the GPS receiving circuit 30, the time measuring means 51 updates the counter with the received time information and corrects the time.
The time display means 52 includes the movement 21 driven by the electric power stored in the secondary battery 24, and displays the time measured by the time measuring means 51 by moving the hands 12 on the surface of the electronic timepiece 1.

  The remaining amount display means 60 displays the remaining battery level (battery capacity) based on the battery voltage of the secondary battery 24, as will be described later. Specifically, the remaining amount display means 60 displays the remaining amount level stored in the storage unit 40 </ b> A using the indicator needle 61. In the present embodiment, the remaining amount display means 60 automatically displays the remaining amount level stored in the storage unit 40A even if no button operation or the like is performed.

  The notice display means 70 performs a notice display based on the battery voltage of the secondary battery 24, as will be described later. In the present embodiment, display is performed by moving the second hand 121 for 2 seconds.

[Operation of control circuit]
The operation of the control circuit 40 in the electronic timepiece 1 will be described with reference to the flowcharts of FIGS. In the present embodiment, the first voltage is set to 3.6V, the second voltage is set to 3.4V, and the third voltage is set to 3.2V.

First, the control circuit 40 determines whether the battery voltage detection timing has come (S1). In the present embodiment, the battery voltage detection timing is set every minute, for example.
If it determines with Yes by S1, the control circuit 40 will operate the battery voltage detection circuit 45, and will detect the voltage of the secondary battery 24 (S2).
In the present embodiment, the secondary battery 24 having the characteristics shown in FIG. 6 is used. FIG. 6 shows the characteristics of the secondary battery 24 when the battery capacity is 100% when the battery voltage is 4.2V.

The control circuit 40 determines the level of the battery voltage detected by the battery voltage detection circuit 45, and performs processing according to each level.
Specifically, the control circuit 40 determines whether or not the battery voltage is 4.0 V or more (S3), and if it is 4.0 V or more, the storage unit 40A stores “F” indicating Full as the remaining amount level. Based on this data, the indicator hand 61 is moved to the position indicating “F” on the dial 11 (S4). At this time, the pointer 12 continues normal operation. For this reason, the second hand 121 continues normal one-second movement (hand movement that is step-driven every second). The control circuit 40 permits reception by the GPS receiving circuit 30. Therefore, when the preset automatic reception time is reached (at the time of automatic reception processing), or when the user performs a reception start operation by pressing the button 15 for 3 seconds or more (at the time of manual reception processing), the control circuit 40 operates the GPS receiving circuit 30 to perform reception processing.

When it determines with No by S3, the control circuit 40 determines whether a battery voltage is 3.6V or more and less than 4.0V (S5).
When it is determined Yes in S5, the control circuit 40 stores “M” meaning Middle as the remaining amount level in the storage unit 40A, and at the position indicating “M” on the dial 11 based on this data. The indicator needle 61 is moved (S6). At this time, the pointer 12 continues normal hand movement (1 second hand movement) and permits reception by the GPS receiving circuit 30. For this reason, the control circuit 40 operates the GPS receiving circuit 30 to perform reception processing during automatic reception processing or manual reception processing.

When it determines with No by S5, the control circuit 40 determines whether a battery voltage is 3.4V or more and less than 3.6V (1st voltage) (S7).
If it is determined Yes in S7, the control circuit 40 executes the first control mode. That is, the control circuit 40 stores “E”, which means Empty, as the remaining amount level in the storage unit 40A, and moves the indicator hand 61 to a position indicating “E” on the dial 11 based on this data ( S8). The pointer 12 continues normal hand movement (1 second hand movement), but prohibits the start of reception by the GPS receiving circuit 30 (start of load driving). For this reason, the control circuit 40 does not operate the GPS receiving circuit 30 even if the automatic receiving process or the manual receiving process is performed, and prohibits the start of the receiving process.

When it determines with No by S7, the control circuit 40 determines whether a battery voltage is 3.2V or more and less than 3.4V (2nd voltage) (S9).
If it is determined Yes in S9, the control circuit 40 executes the second control mode. That is, the control circuit 40 stores “E”, which means Empty, as the remaining amount level in the storage unit 40A, and moves the indicator hand 61 to a position indicating “E” on the dial 11 based on this data ( S10). In addition, the control circuit 40 performs BLD hand movement using the second hand 121. BLD hand movement is a function that prompts charging by notifying the user of a battery low display or a battery life indicator. For this reason, the control circuit 40 moves the second hand 121 every 2 seconds for 2 seconds, and causes the user to perform BLD display by operating differently from the normal one-second movement. Notice.
The control circuit 40 also prohibits reception by the GPS receiving circuit 30.

When it determines with No by S9, the control circuit 40 determines whether a battery voltage is less than 3.2V (3rd voltage) (S11).
When it is determined Yes in S11, the control circuit 40 stores “E”, which means Empty, in the storage unit 40A as the remaining amount level, and at the position indicating “E” on the dial 11 based on this data. The indicator needle 61 is moved (S12). In addition, the control circuit 40 stops the second hand 121 and prohibits reception by the GPS receiving circuit 30.
Note that if “No” is determined in S9, the battery voltage should be less than 3.2 V, so the processing in S12 may be performed directly without performing the determination processing in S11.

Next, processing when the GPS receiving circuit 30 is operating will be described based on the flowchart of FIG.
When the reception process is started, the control circuit 40 first determines whether it is the detection timing of the battery voltage (S21). In this embodiment, the battery voltage detection timing during reception is set to an interval of 1 second that is shorter than an interval of 1 minute when reception is not being performed.
If it determines with Yes by S21, the control circuit 40 will operate the battery voltage detection circuit 45 for every second, and will detect the voltage of the secondary battery 24 (S22).

Then, the control circuit 40 determines whether the detected battery voltage is less than the third voltage (3.2 V in the present embodiment) (S23). If the battery voltage is equal to or higher than the third voltage and it is determined No in S23, the control circuit 40 determines whether the reception process is completed (S24).
When the necessary data is received or when the set time has elapsed from the start of reception, the control circuit 40 determines that reception has ended in S24. On the other hand, if the control circuit 40 determines in S24 that reception has not ended, it returns to S21 and continues processing.

If the battery voltage is less than the third voltage in S23 (if determined Yes in S23), the control circuit 40 stops the reception process (S25).
Then, the control circuit 40 ends the process of FIG. 5 when the reception process is stopped in S25 or when it is determined that the reception is ended in S24.
Note that while the GPS receiving circuit 30 is operating, only the processing of FIG. 5 is performed, and the processing of FIG. 4 is not executed. For this reason, during the operation of the GPS receiving circuit 30, the remaining amount level display processing by the remaining amount display means 60 is not updated.

FIG. 7 shows the relationship between the battery capacity, the indicator hand 61 instruction (remaining level), the second hand 121 hand movement control, and the number of continuous days at each battery voltage level. Here, the duration is the duration (days) in which the electronic timepiece 1 operates when the reception process is not performed on the voltage of the secondary battery 24.
FIG. 8 shows a change in battery voltage from the start to the end of reception. As shown in FIG. 8, when the battery voltage is received at a voltage lower than the first voltage of 3.6 V, the internal impedance rises and the received voltage causes the battery voltage to be a third voltage required for the receiving operation (for example, 3.2V) Decrease to below. As described above, when the reception process is performed in a state where the battery voltage is 3.6 V or lower, the voltage is lower than the voltage (3.2 V) necessary for operating the GPS receiving circuit 30 that is a load, and thus reception is not possible. For this reason, it is necessary to limit the reception process not to be executed when the battery voltage is 3.6 V or less.
On the other hand, if the battery voltage is equal to or higher than the first voltage, for example, about 3.9V, even if the battery voltage decreases in the reception process, the voltage required for reception (3.2V) will not fall below. There is no need to limit.

Therefore, as shown in FIG. 4 and FIG. 7, if the battery voltage is 4.0 V or higher, the battery is sufficiently receivable. Therefore, the indicator hand 61 indicates “F” as the remaining amount level, and the normal hand movement ( 1 second movement) is continued and reception processing is not limited.
When the battery voltage is 3.6V or more and less than 4.0V, the battery capacity is slightly reduced. Therefore, the indicator hand 61 indicates “M” as the remaining level, but the normal hand movement (1 second hand movement) is continued. Reception processing is not limited. In other words, the operation of the electronic timepiece 1 is not limited, but the fact that the battery voltage decreases and the “E” state, that is, the state where reception is restricted, is approached by indicating “M” with the indicator hand 61. The user is urged to charge the secondary battery 24. Since the electronic timepiece 1 includes the solar cell 22, the user can charge the secondary battery 24 by irradiating the solar cell 22 with light.

If the battery voltage is less than the first voltage of 3.6 V, the first control mode is executed as described above, and the reception process cannot be started. Therefore, the indicator hand 61 indicates “E” as the remaining amount level. For this reason, the control circuit 40 does not perform forced reception processing even when the button 15 is pressed, and does not perform automatic reception processing even when the automatic reception processing time comes.
On the other hand, even if the battery voltage is less than 3.6V, if the second voltage is 3.4V or more, the duration of the battery functions as a clock for a sufficient period of 65 days. During this period of 65 days, functions as a normal clock other than the reception function can be fully utilized, so it is useless to operate the second hand 121 for 2 seconds to perform an operation different from the normal operation. Therefore, the control circuit 40 continues the 1-second movement of the second hand 121.

  Further, when the battery voltage becomes less than 3.4 V, which is the second voltage, the number of days that can function as a clock decreases. Therefore, the control circuit 40 changes the second hand 121 to a two-second hand (BLD hand) and informs the user of the battery voltage. The solar cell 22 is immediately charged with light and charged.

[Effects of First Embodiment]
According to such 1st Embodiment, the following effects are obtained.
The control circuit 40 operates the battery voltage detection circuit 45 at a constant cycle to detect the battery voltage of the secondary battery 24, and the battery voltage of the secondary battery 24 is less than the first voltage (3.6V in this embodiment). When the voltage drops, the indicator needle 61 instructs “E” and prohibits the receiving operation. For this reason, since the reception operation is not started in a state where the battery voltage is lower than the first voltage, it is possible to avoid a state in which the battery voltage decreases during the reception operation and the reception process must be stopped. . For this reason, the secondary battery 24 can be used effectively and the duration time can be increased without consuming wasteful power for the reception process.

  Further, when the battery voltage of the secondary battery 24 falls below the second voltage (3.4 V in this embodiment), the control circuit 40 moves the second hand 121 for 2 seconds to perform BLD display. For this reason, it can be notified to the user that the battery voltage is decreasing, and charging by the solar cell 22 can be promoted. Accordingly, it is possible to easily prevent the battery voltage from further decreasing to less than 3.2 V and the state where the hand movement must be stopped.

  Further, the control circuit 40 notifies the state (“E”) that the battery voltage is less than the first voltage and the reception operation is prohibited by the indicator hand 61, and notifies the BLD state by the second hand 121. As described above, since the indicator hand 61 and the second hand 121 are used to notify the two states, the user can easily grasp the current situation and the usability of the electronic timepiece 1 can be improved.

  In addition, the control circuit 40 prohibits the reception operation when the battery voltage of the secondary battery 24 is less than the first voltage and greater than or equal to the second voltage, but continues the normal one-second movement. For this reason, it can be used as a watch compared to the case where the BLD display hand movement is performed simultaneously with the prohibition of the reception operation or the reception operation is prohibited when the battery voltage further decreases after performing the BLD display hand movement. The period can be extended. In this respect, the usability of the electronic timepiece 1 can be improved.

  Furthermore, since the BLD display is performed using the second hand 121, the user can easily confirm that the battery voltage has decreased. Further, since the second hand 121 is often driven by an independent motor, switching between 1-second hand movement and 2-second hand movement can be easily performed.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIGS.
In the second embodiment, the detection timing of the battery voltage by the control circuit 40 is changed depending on whether or not it is in a charged state (power generation state), and the subsequent processing is the same as in the first embodiment. Therefore, in the flowchart of FIG. 9, the same processes as those in the flowchart of FIG.

The control circuit 40 of the second embodiment first determines whether or not the battery is charged (S31). Specifically, as shown in FIG. 10, the control circuit 40 outputs a control signal at intervals of 1 second, and operates the power generation state detection circuit 43 every second.
When the control signal is input, the power generation state detection circuit 43 outputs a detection result indicating whether or not the battery is in the charging state (power generation state) to the control circuit 40. For this reason, the control circuit 40 determines whether it is in a charged state (S31).

When it is determined No in S31, that is, during the non-charge state, the control circuit 40 sets the battery voltage detection timing, for example, at an interval of 1 minute (S32). On the other hand, the control circuit 40 sets the battery voltage detection timing to, for example, an interval of 2 minutes when it is determined Yes in S31, that is, during the charging state (S33).
Then, the control circuit 40 performs the determination process of S1 at the battery voltage detection timing set in S32 and S33. The processing from S2 to S12 after the determination of Yes in S1 is the same as that in the first embodiment.
In this embodiment, the battery voltage detection timing of S1 may be the same as the detection timing of the state of charge of S31 or may be detected at a different timing as shown in FIG. Furthermore, the detection intervals of S32 and 33 are not limited to 1 minute and 2 minutes, and may be set as appropriate according to the type of charging means.

[Effects of Second Embodiment]
According to the second embodiment as described above, the same operational effects as the first embodiment can be obtained, and in the charged state, the battery voltage detection timing is increased to 2 minutes and twice the normal timing. Therefore, the display update interval of the indicator hands 61 of S2 to S12 and the update interval of the hand movement control and reception control of the second hand 121 can be lengthened.
Here, during charging, the battery voltage detected by the battery voltage detection circuit 45 temporarily increases due to the internal resistance of the secondary battery 24. For this reason, the detection voltage becomes higher than the actual voltage, and when the processes of S3 to S12 are performed with such an apparent battery voltage, the actual battery capacity and the display of the indicator needle 61 are shifted.
On the other hand, if the interval of the battery voltage detection timing during charging is increased as in this embodiment, the time until the display of the indicator needle 61 is updated becomes longer, and the secondary battery 24 is charged during that time. The time can be extended. Therefore, an error between the display of the indicator hand 61 and the actual battery capacity can be reduced, and each control mode can be appropriately executed.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to the flowchart of FIG. In the process of the third embodiment, the same processes as those of the first and second embodiments are denoted by the same reference numerals and the description thereof is omitted.
In the third embodiment, as shown in FIG. 11, the control circuit 40 determines whether the battery is in a charged state after determining “Yes” in the determination of the battery voltage detection timing (S <b> 1) (S <b> 31). This charging state determination process (S31) is the same process as in the second embodiment.

  If the control circuit 40 determines Yes in S31, it displays that the battery is being charged without executing the processes in S2 to S12 (S32). The method of displaying that the battery is being charged is, for example, that the indicator hand 61 is moved to a place where none of “F, M, and E” is indicated, and the battery capacity is not displayed to indicate that the battery is being charged. Show it. Alternatively, a scale indicating “charging” may be added to indicate with the indicator needle 61.

On the other hand, when it is determined No in S31, the control circuit 40 performs the processes of S2 to S12 as in the first and second embodiments.
Also in this embodiment, the battery voltage detection timing in S1 and the charge state detection timing in S31 may be the same or different.

[Effects of Third Embodiment]
According to such a 3rd embodiment, while being able to obtain the same operation effect as a 1st embodiment, during charge, charging is displayed (S32) and processing of S2-S12 is not performed. For this reason, during charging, the battery voltage detected by the battery voltage detection circuit 45 is temporarily increased by the internal resistance of the secondary battery 24, so that the actual battery capacity and the display of the indicator needle 61 and the like are displayed. It can prevent shifting. Since the process of S2-S12 is performed when it is no longer in a charging state, each control mode can be appropriately executed based on the actual battery voltage after charging.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to the flowchart of FIG. In the process of the fourth embodiment, the same processes as those of the first to third embodiments are denoted by the same reference numerals and the description thereof is omitted.
In the fourth embodiment, as shown in FIG. 12, the control circuit 40 determines whether or not the open circuit voltage is equal to or higher than the set value after determining “Yes” in the determination (S1) of the battery voltage detection timing ( S41).

In S41, the control circuit 40 switches the charge control switch 42 to the OFF state, operates the open-circuit voltage detection circuit 44 to detect the open-circuit voltage, and determines whether the value is equal to or higher than a set value. Here, since the charge control switch 42 is in the OFF state, the solar cell 22 and the open-circuit voltage detection circuit 44 are disconnected from the secondary battery 24. Therefore, the open-circuit voltage detection circuit 44 can detect the open-circuit voltage corresponding to the illuminance of light hitting the solar cell 22 without being affected by the charging voltage of the secondary battery 24.
The open circuit voltage increases as the illuminance in the solar cell 22 increases. Further, the solar cell 22 has a higher charging current as the illuminance being hit, that is, the open circuit voltage is higher. When the charging current increases, the apparent voltage in the secondary battery 24 increases. In this state, when the processes of S2 to S12 are performed, there is a possibility that the actual battery voltage of the secondary battery 24 and the instruction of the indicator needle 61 are different.

Therefore, in this embodiment, when it is determined Yes in S41, control is performed so as not to perform the processes of S2 to S12.
The set value (threshold value) of the open-circuit voltage may be set to a level at which the charging current increases, for example, a level at which it can be determined whether or not the electronic timepiece 1 is in a state where sunlight is irradiated.
In addition, when the open circuit voltage is detected, the charge control switch 42 is turned off, so that the secondary battery 24 cannot be charged. For this reason, it is preferable to detect the open circuit voltage intermittently in accordance with the battery voltage detection timing.

  On the other hand, when it is determined No in S41, the control circuit 40 performs the processes of S2 to S12 as in the first to third embodiments.

[Effects of Fourth Embodiment]
According to such 4th Embodiment, the same effect as 1st Embodiment is acquired, and when an open circuit voltage is more than a setting value, the process of S2-S12 is not performed. For this reason, the illuminance hitting the solar cell 22 is high, the charging current is increased, and the battery voltage detected by the battery voltage detection circuit 45 is temporarily increased, so that the actual battery capacity and the indicator needle 61 are displayed. Etc. can be prevented from shifting. Since the processes of S2 to S12 are performed when the open circuit voltage becomes less than the set value, each control mode can be appropriately executed based on the actual battery voltage after charging.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIG.
An electronic timepiece 1A of the fifth embodiment is one in which the indicator hand 61 of the above embodiment is eliminated and the second hand 121 is also used as an indicator hand. Therefore, in the electronic timepiece 1A, for example, when the button 16 is pressed for a predetermined time or longer, the second hand 121 operates as an indicator hand, and based on the latest remaining level (battery voltage detection result) stored in the storage unit 40A, “ "F, M, E" is indicated. In FIG. 13, "F" is displayed at the 56-second position of the dial 11, "M" is displayed at the 53-second position, and "E" is displayed at the 50-second position. The remaining capacity of the battery capacity is indicated by the second hand 121 as an indicator hand. Display the level indicator.

  As described above, the fifth embodiment is different from the above embodiment in that the indicator hand is also used as the second hand 121. Therefore, any of the first to fourth embodiments may be applied to the battery voltage detection processing method.

[Effects of Fifth Embodiment]
According to the fifth embodiment, since the indicator hand 61 can be eliminated and the second hand 121 can be used, the indicator hand 61, the motor for driving the indicator hand 61, and the train wheel can be dispensed with. For this reason, the number of parts can be reduced and the cost can be reduced.

[Sixth Embodiment]
Next, a sixth embodiment of the present invention will be described with reference to FIG.
An electronic timepiece 1B according to the sixth embodiment includes a day hand 125 that indicates the day of the week, and the day hand 125 is also used as an indicator hand. For this reason, in the electronic timepiece 1B, the day of the week indicated by the day of the week hand 125 is displayed on the dial 11 along the semicircle portion.
Further, “F, M, E” for indicator display is also displayed adjacent to the day display. Specifically, “F” is displayed at the “Sun” position on the dial 11, “M” is displayed at the “Thu” position, and “E” is displayed at the “Mon” position.

  In the electronic timepiece 1B, for example, when the button 16 is pressed for a predetermined time or longer, the day of the week hand 125 that indicates the day of the week normally operates as an indicator hand, and the latest remaining amount level (battery voltage) stored in the storage unit 40A. Based on the detection result, one of “F, M, E” is instructed.

  As described above, the sixth embodiment is different from the above-described embodiment in that the indicator hand is also used as the day hand 125. Therefore, any of the first to fourth embodiments may be applied to the battery voltage detection processing method.

[Effects of Sixth Embodiment]
According to the sixth embodiment, since the indicator hand 61 is eliminated and the day hand 125 can be used, the number of parts can be reduced and the cost can be reduced as compared with the case where the indicator hand 61 is provided separately from the day hand 125. Can be reduced.

[Seventh Embodiment]
Next, a seventh embodiment of the present invention will be described with reference to FIG.
The electronic timepiece 1C of the seventh embodiment includes an indicator hand 61A, and the indicator hand 61A serves as both the remaining amount display means 60 and the notice display means 70 for displaying the remaining battery level. And different.
That is, the indicator hand 61A indicates “E1, E2” in addition to “F, M” for displaying the remaining battery level. “E1” is instructed when the remaining battery level (voltage) is low and the first control mode for prohibiting the start of the receiving operation is being executed, as in “E” in each of the above embodiments. .
On the other hand, “E2” is instructed when the second control mode in which the remaining battery level (voltage) further decreases and the time measuring mechanism is approaching to stop is being executed.

  Thus, the seventh embodiment uses the indicator hand 61A not only as the remaining amount display means 60 but also as the notice display means 70, because the second hand 121 is used as the notice display means. It differs from the form. Therefore, any of the first to fourth embodiments may be applied to the battery voltage detection processing method.

[Effects of Seventh Embodiment]
According to the seventh embodiment, since the indicator needle 61A is used as the remaining amount display means 60 and the notice display means 70, if the user checks only the instruction of the indicator needle 61A, the current first Whether the control mode is set or the second control mode can be checked.
Further, there is no need to operate the second hand 121 with a special hand movement in the second control mode, and the second hand 121 can be easily controlled.

[Other Embodiments]
In addition, this invention is not limited to the structure of the said embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention.

For example, each embodiment described above is an analog electronic timepiece that uses the hands 12 as the time display means 52, but may be a digital electronic timepiece that displays time using a liquid crystal display or the like.
Further, the charging means is not limited to the solar cell 22, and a generator that generates power using a rotating weight or the like may be used. In addition, the battery may be charged from an external power source (such as a commercial outlet) using a power cord, or may be charged from an external power source by non-contact charging using electromagnetic induction or the like.

The remaining amount display means 60 of the above embodiment displays the remaining battery level in three stages of F, M, and E. For example, “F” and “ E ”may be displayed in two stages. On the other hand, the remaining amount display means 60 may display the remaining battery level in four or more stages. For example, the remaining battery level may be displayed from 0 to 100% by the indicator needle 61 every 1%.
The notice display means 70 is not limited to the one that moves the second hand 121 for 2 seconds, and may be any display that differs from the normal hand movement, such as one that reciprocates the second hand 121 within a certain range.

  In each of the above embodiments, when determining the level of the battery voltage, the determination is made by sequentially comparing the threshold values from S3 to S11. However, the detection value of the battery voltage detection circuit 45 is converted into a numerical value via an AD converter. You may judge directly.

  The electronic timepiece 1 of the present invention is not limited to a wristwatch, and can be widely applied to various devices having an electronic timepiece function. In particular, it is suitable for a portable electronic timepiece driven by a secondary battery.

  DESCRIPTION OF SYMBOLS 1,1A, 1B, 1C ... Electronic timepiece, 12 ... Hand, 15, 16 ... Button, 21 ... Movement, 22 ... Solar cell, 23 ... GPS antenna, 24 ... Secondary battery, 30 ... GPS receiving circuit, 40 ... Control Circuit: 40A ... Storage unit, 42 ... Charge control switch, 43 ... Power generation state detection circuit, 44 ... Open voltage detection circuit, 45 ... Battery voltage detection circuit, 51 ... Time measuring means, 52 ... Time display means, 60 ... Remaining amount Display means, 61, 61A ... indicator hand, 70 ... notice display means, 121 ... second hand, 125 ... day of the week hand.

Claims (10)

A secondary battery,
Charging means for charging the secondary battery with power;
A time measuring means for measuring time driven by the power of the secondary battery;
Time display means driven by the power of the secondary battery to display the time;
And load that will be driven by the power of the secondary battery other than the time measuring means and the time display means,
Battery voltage detection means for detecting the voltage of the secondary battery;
When the voltage of the secondary battery has dropped below the first voltage, execute the first control mode that prohibits the driving start of the load and does not prohibit the driving of the time measuring means and the time display means ,
Control means for executing a second control mode for notifying that the stop of the time measuring means is approaching when the voltage of the secondary battery drops below a second voltage lower than the first voltage. An electronic timepiece characterized by that. The electronic timepiece according to claim 1,
A remaining amount display means for displaying a remaining battery level of the secondary battery;
A notice display means for notifying the stop of the time measuring means,
The time display means includes a second hand,
When the first control mode is executed, the remaining amount display means uses a pointer different from the second hand as an indicator hand for displaying the remaining battery level,
When the second control mode is executed, the notice display means operates the second hand with a different hand movement from a normal hand movement. The electronic timepiece according to claim 1,
A remaining amount display means for displaying a remaining battery level of the secondary battery;
A notice display means for notifying the stop of the time measuring means,
The time display means includes a second hand,
When the first control mode is executed, the remaining amount display means uses the second hand as an indicator hand for displaying a battery remaining amount,
When the second control mode is executed, the notice display means operates the second hand with a different hand movement from a normal hand movement. The electronic timepiece according to claim 2 or 3,
A storage unit for storing a remaining battery level of the secondary battery;
And a button,
The control unit operates the remaining amount display unit when the button is pressed during execution of the first control mode, and displays the remaining battery level based on data stored in the storage unit. Electronic clock. The electronic timepiece according to any one of claims 2 to 4,
The electronic timepiece characterized in that the control means does not update the battery remaining amount display by the remaining amount display means during operation of the load. The electronic timepiece according to any one of claims 1 to 5,
The electronic timepiece characterized in that the control means makes the battery voltage detection interval by the battery voltage detection means during operation of the load shorter than the detection interval when the load is not operating. The electronic timepiece according to any one of claims 1 to 6,
The control means stops the operation of the load when the voltage of the secondary battery detected by the battery voltage detection means during operation of the load falls below a third voltage lower than the first voltage. An electronic watch characterized by The electronic timepiece according to any one of claims 1 to 7,
A charging state detecting means for detecting whether the charging means is in a charging state in which the secondary battery is charged with power or in a non-charging state;
The electronic timepiece characterized in that when the charging means is in a charged state, the control means makes the battery voltage detection interval by the battery voltage detecting means longer than that in a non-charged state. The electronic timepiece according to any one of claims 1 to 7,
A charging state detecting means for detecting whether the charging means is in a charging state in which the secondary battery is charged with power or in a non-charging state;
The electronic timepiece characterized in that the control means stops the battery voltage detection operation by the battery voltage detection means when the charging means is in a charged state. The electronic timepiece according to any one of claims 1 to 7,
The charging means includes a solar cell,
Comprising an open voltage detection means for detecting an open voltage of the solar cell;
The control unit stops the battery voltage detection operation by the battery voltage detection unit when the open voltage is equal to or higher than a set value.

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