JP2016075623A - Radio watch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio watch that can restrain displaying of unnecessary alarms even when pre-processing for radio wave reception invites a voltage drop.SOLUTION: A satellite-transmitted radio wave receiving wristwatch is equipped with a radio wave receiver for receiving radio waves including time information, an alarm display 31c that displays an alarm when the voltage of a built-in power source drops, and a limiter 31d that limits alarm displaying by the alarm display 31c before starting radio wave reception processing by the radio wave receiver is started.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a radio timepiece.

  A wristwatch driven by a built-in power source such as a battery and receiving a radio wave including time information and correcting the time is known. Here, the power consumed when the radio wave reception process is performed is larger than the power consumed when the pointer is driven, and the power supply voltage may temporarily decrease when the radio wave reception process is performed.

  In Patent Document 1 below, even when the voltage of the built-in battery drops, the radio wave that restricts the display for warning of the voltage drop until the predetermined condition is satisfied after the reception processing by the radio wave receiving means is completed. A wristwatch is described.

JP 2012-207939 A

  In the radio-controlled wristwatch described in Patent Document 1, a warning message indicating a voltage drop is suppressed from the end of radio wave reception processing. Further, Patent Document 1 describes that the timing of suppressing the voltage drop warning display may be from the start of the radio wave reception process. However, in the radio wristwatch, pre-processing such as activation of the receiving circuit and hand movement may be performed prior to the start of reception processing of radio waves including time information, and voltage reduction may occur due to pre-processing. Conceivable. Therefore, in some cases, an originally unnecessary warning may be displayed due to the preprocessing.

  Accordingly, an object of the present invention is to provide a radio timepiece that suppresses unnecessary warning display even when a voltage drop occurs due to preprocessing of radio wave reception processing.

  The invention disclosed in the present application in order to solve the above problems has various aspects, and the outline of typical ones of these aspects is as follows.

  (1) A radio wave receiving unit that receives radio waves including time information, a warning display unit that displays a warning when the voltage of the built-in power supply decreases, and before the radio wave receiving unit starts the radio wave receiving process And a limiting unit that limits the display of the warning by the warning display unit.

  (2) In (1), the restriction unit restricts display of the warning at least before the start of the first operation accompanied by a decrease in the voltage of the power supply.

  (3) The radio timepiece according to (2), wherein the first operation is at least one of an operation of starting a receiving circuit for receiving the radio wave and an operation of tracking a satellite radio wave including the radio wave.

  (4) The radio timepiece according to (2), further comprising a pointer indicating information related to reception of the radio wave, wherein the first operation is an operation of moving the pointer.

  (5) In (1), the limiting unit is at least after the end of the radio wave receiving process by the radio wave receiving unit and after the end of the second operation accompanied by a decrease in the voltage of the power source. A radio clock that restricts the display of the warning.

  (6) The radio timepiece according to (5), further comprising a pointer indicating information related to reception of the radio wave, wherein the second operation is an operation of moving the pointer.

  (7) In (1), the warning display unit displays the warning when the voltage of the power source is less than a first threshold value, and the limiting unit displays the voltage of the power source less than the first threshold value. A radio timepiece that restricts display of the warning when it is equal to or greater than a second threshold value that is smaller than the first threshold value.

  (8) (7) The radio wave clock that limits the display of the warning for a certain period before the radio wave receiver starts the radio wave reception process.

  (9) (8) The radio wave clock that extends the certain period of time when the voltage of the power source is less than the first threshold when the radio wave reception unit starts the radio wave reception process. .

  According to the above aspect (1) of the present invention, it is possible to obtain a radio timepiece in which unnecessary warning display is suppressed even when a voltage drop occurs due to preprocessing of radio wave reception processing.

  Further, according to the aspect (2) of the present invention, it is possible to obtain a radio timepiece that suppresses unnecessary warning display before a voltage drop occurs due to preprocessing of radio wave reception processing.

  In addition, according to the above aspect (3) of the present invention, it is possible to obtain a radio timepiece in which unnecessary warning display is suppressed even when the receiving circuit is activated prior to the start of radio wave reception processing.

  In addition, according to the above aspect (4) of the present invention, it is possible to obtain a radio timepiece in which unnecessary warning display is suppressed even when the pointer is operated prior to the start of radio wave reception processing.

  In addition, according to the above aspect (5) of the present invention, it is possible to obtain a radio timepiece in which unnecessary warning display is suppressed even after the radio wave reception process is completed.

  Further, according to the above aspect (6) of the present invention, it is possible to obtain a radio timepiece in which unnecessary warning display is suppressed even when the hands are operated after the radio wave reception process is completed.

  In addition, according to the above aspect (7) of the present invention, a radio timepiece can be obtained in which a warning is displayed when the power supply voltage is so low that radio wave reception processing cannot be performed.

  In addition, according to the above aspect (8) of the present invention, it is possible to obtain a radio timepiece in which unnecessary warning display is suppressed during a period from when the power supply voltage is lowered until the power supply voltage is recovered.

  Further, according to the above aspect (9) of the present invention, it is possible to obtain a radio timepiece in which unnecessary warning display is suppressed even when it takes a relatively long time to recover the power supply voltage.

It is a top view which shows an example of the external appearance of the satellite radio-controlled wristwatch which concerns on the 1st Embodiment of this invention. 1 is a configuration block diagram showing an internal configuration of a satellite radio-controlled wristwatch according to a first embodiment of the present invention. It is a functional block diagram which shows the function which the satellite radio-controlled wristwatch concerning the 1st Embodiment of this invention implement | achieves. It is a figure which shows operation of a push button, a receiving circuit, and a pointer in order of time. It is a figure which shows the change of the power supply voltage accompanying a reception process. It is a flowchart which shows the warning display restriction | limiting process performed after operation of a push button is performed until reception processing is performed. It is a flowchart which shows the warning display limitation process before and after the end of the reception process. It is a flowchart which shows the warning display restriction | limiting process performed in the satellite radio-controlled wristwatch which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the warning display restriction | limiting process performed in the satellite radio-controlled wristwatch which concerns on the 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a plan view showing an example of the appearance of the satellite radio-controlled wristwatch 1 according to the first embodiment of the present invention. The figure shows a dial 53 arranged in the case which is the exterior (watch case) of the satellite radio-controlled wristwatch 1, and hour hand 52a, minute hand 52b and second hand 52c which are hands indicating time. Further, on the side surface of the trunk at 3 o'clock, a crown 60a which is an operation unit 60 for a user of the satellite radio-controlled wristwatch 1 to perform various operations, and a push button 60b are arranged.

  The satellite radio-controlled wristwatch 1 is provided with a windshield formed of a transparent material such as glass so as to cover the dial 53. A back cover is attached to the trunk on the opposite side of the windshield. In the present specification, hereinafter, the direction in which the windshield of the satellite radio-controlled wristwatch 1 is disposed (front side in FIG. 1) is referred to as the front side, and the direction in which the back cover is disposed (back direction in FIG. 1) is referred to as the back side.

  A solar cell 43 is disposed on the back side of the dial 53, and power is generated by light incident from the front side. Therefore, the dial 53 is formed of a material that transmits light to some extent. A patch antenna for receiving satellite radio waves is arranged in a region that does not overlap with the solar battery 43. The front surface of the patch antenna is a receiving surface that receives radio waves from a satellite. The receiving surface of the patch antenna, the light receiving surface of the solar cell 43, and the dial plate 53 are provided in parallel to each other, and all face the front side. Note that a chip antenna or an inverted F antenna may be employed instead of the patch antenna.

  In this specification, the term satellite radio wave wristwatch refers to a wristwatch that receives a satellite signal from a satellite that transmits information (time information) related to date and time, such as a GPS (Global Positioning System) satellite. In addition, it is used to indicate a wristwatch having a function of correcting the internal time, which is time information held in the wristwatch, based on the time information included therein. However, the present invention is not limited to a satellite radio-controlled wristwatch, but may be applied to a radio-controlled wristwatch that receives a general standard radio wave and corrects the internal time, and may be applied to a small watch that is not a wristwatch, such as a pocket watch. You can also. The satellite radio wave wristwatch may also receive positioning information included in the satellite signal. The satellite that transmits the satellite signal received by the satellite radio-controlled wristwatch may be a satellite that is operated in addition to the GSP satellite, or that is planned to be used in the future, such as Glonas, Galileo, and Compass (Hokuto). Good. The satellite radio wave wristwatch may perform positioning by receiving information other than the time information included in the satellite signal, for example, positioning information.

A satellite radio wave transmitted from a GPS satellite is a radio wave obtained by modulating a carrier wave (L1 band radio wave) having a frequency of about 1.6 GHz by phase shift modulation. The signal encoded by the satellite radio wave is a signal obtained by superimposing a pseudo random number (PRN) unique to each GPS satellite and a satellite signal including time information. The satellite radio wave wristwatch 1 receives a plurality of satellite radio waves transmitted from a plurality of satellites and determines which satellite PRN has a large correlation, so that each of the received satellite radio waves It is discriminated whether it is transmitted from the satellite. In this specification, such a satellite discrimination process is referred to as satellite radio wave tracking. The satellite signal includes time information. The time information includes the TOW (Time Of Week) indicating the current time starting from the beginning of the week (Sunday 0:00 am) and the current time counted from a predetermined reference time. And week number WN indicating the number of the week. Therefore, the radio-controlled wristwatch 1 may receive only the TOW depending on the case, or may receive the TOW and the week number WN together. Further, GPS time, because there is a deviation caused by the leap seconds against UTC, GPS satellites also are transmitting leap seconds information delta _LS for correcting the deviation. Therefore, the wristwatch 1 is not only the time information from the GPS satellites, which also receives the leap seconds information delta _LS.

  In the example of the satellite radio-controlled wristwatch 1 shown in FIG. 1, around the dial 53, a reception success character 54 that is “OK”, a reception failure character 55 that is “NG”, and a character “RX”. The receiving character 56 is shown. The reception success character 54 and the reception failure character 55 are indexes indicating success or failure of the reception processing result by the satellite radio wave wristwatch 1 using, for example, the second hand 52c, and using these indexes, prior to the execution of the reception processing. A case where an operation indicating the result of the previous reception process is performed is conceivable.

  For example, as an operation related to the reception processing of the satellite radio-controlled wristwatch 1, for example, the result of the previous reception processing is displayed by pressing the push button 60b, and the satellite signal reception processing is further performed by pressing the push button 60b for a few seconds. The case of instructing the execution of is exemplified. In this case, when the push button 60b is pressed, for example, the second hand 52c that has engraved the second temporarily leaves the normal timing operation, and indicates the result of the previous reception process. When the result of the previous reception process is a successful reception, the second hand 52c points to the reception success character 54, which is a character “OK”. When the result of the previous reception process is a reception failure, the second hand 52c is a character “NG”. A certain reception failure character 55 is indicated. Thereby, the user of the satellite radio-controlled wristwatch 1 can determine whether or not it is necessary to instruct the reception of the satellite signal. When it is determined that it is not necessary to receive the satellite signal again, the push button 60b is stopped. When the pressed state of the push button 60b is canceled before elapse of a certain period, for example, 2 seconds, the second hand 52c thereafter returns to the normal timing operation. On the other hand, when the push button 60b is kept pressed for a certain period, the satellite radio-controlled wristwatch 1 executes satellite signal reception processing. During the execution of the reception process, for example, the second hand 52c indicates the receiving character 56 that is the character “RX”. Thereby, the user of the satellite radio-controlled wristwatch 1 can confirm that the reception process is being executed in the satellite radio-controlled wristwatch 1. Further, after the satellite signal reception process is completed, for example, the second hand 52 c indicates the reception success character 54 or the reception failure character 55. Thereby, the user of the satellite radio-controlled wristwatch 1 can confirm the success or failure of the reception process.

  The display of the result of the previous reception process is an example of an operation performed prior to the execution of the satellite signal reception process, but the operation performed before the execution of the satellite signal reception process is not limited thereto. . Examples of such operations include power generation amount monitoring, city display, daylight saving time display, battery remaining amount display, reception state monitor, and the like.

  The power generation amount monitor indicates the amount of current generated by the solar battery 43, and is displayed, for example, by indicating the amount of current (power generation level) with the second hand 52c, the secondary hand, or the like. To receive the satellite signal, it is necessary to operate a high-frequency circuit 21 and a decoding circuit 22 described later, and a large current is temporarily required. For this reason, especially when the battery is exhausted, such as when the power supply voltage is low, the power generation amount is more advantageous for reception. Furthermore, in general, the reception sensitivity of satellite radio waves is higher outdoors with less shielding than indoors, but when a user looks at the power generation monitor and selects a bright environment with a large amount of power generation, the environment is Since there is a high possibility of being outdoors during the day, the power generation monitor prompts the user to move the satellite radio-controlled wristwatch 1 to a brighter environment, thereby facilitating successful satellite signal reception processing. A secondary effect can be expected.

  The city display shows the currently set time zone. This display can be performed by writing city names side by side on the outer peripheral surface or bezel surface of the dial 14 and pointing the city name with the second hand 52c or the like. The daylight saving time display indicates whether or not the current daylight saving time is set. For example, is the daylight saving time being implemented at the set time zone or the current position of the satellite radio-controlled wristwatch 1 obtained from the positioning information of the satellite signal or the like? This can be done by indicating whether or not with the second hand 52c or the like. The remaining battery level indicates the current remaining battery level, for example, by detecting the power supply voltage, and can be performed by indicating the remaining battery level of the secondary battery 40 described later with the second hand 52c or the like. . Furthermore, the reception state monitor indicates whether the reception state of the satellite radio wave is good or not, and can be performed, for example, by pointing and displaying three levels of reception levels (good, normal, bad) with the second hand 52c or the like.

  The method of instructing the satellite radio wave wristwatch 1 to execute the satellite signal reception process is not limited to the above. For example, the result of the previous reception process may be displayed by pressing the push button 60b once, and the reception process may be executed by pressing the push button 60b twice in succession. Alternatively, an operation other than the push button 60b, for example, operation of the crown 60a may be performed, or a touch sensor may be provided on the satellite radio-controlled wristwatch and the touch sensor may be operated. In addition, the satellite signal reception process may be instructed by a method using light or magnetism. Further, the method for indicating success or failure of the reception process and reception is not limited to the above. For example, a secondary needle indicating information related to the reception process may be provided to indicate success or failure of the reception process, and that reception is being performed. Further, it is possible to indicate success or failure of the reception process and reception in progress by sounding an alarm, vibrating the vibration member, or causing the light emitting member to emit light. Of course, the above methods may be combined. In either case, power consumption may occur before the satellite signal reception process is started, and power consumption may occur even after the satellite signal reception process ends.

  The design of the satellite radio-controlled wristwatch 1 shown in FIG. 1 is an example. In addition to those shown here, for example, the body may be square instead of round, and the presence / absence, number, and arrangement of the crown 60a and the push button 60b are arbitrary. In the present embodiment, the hands are three hands, that is, the hour hand 52a, the minute hand 52b, and the second hand 52c. However, the present invention is not limited to this, and even if the second hand 52c is omitted, the day of the week, the time zone or the presence / absence of summer time, the radio wave The reception status, remaining battery level, pointers for various displays, date display, and the like may be added.

  As will be described in detail later, inside the body of the satellite radio-controlled wristwatch 1, a drive mechanism 50 for driving the hands, a secondary battery 40 for accumulating the power generated by the solar cell 43, and the operation of the satellite radio-controlled wristwatch 1. A control circuit 30 for control, a receiving circuit 20 for processing received satellite signals, and the like are accommodated. The secondary battery 40 is a power source built in the satellite radio-controlled wristwatch 1.

  FIG. 2 is a configuration block diagram showing the internal configuration of the radio-controlled wristwatch 1. As shown in the figure, the radio-controlled wristwatch 1 includes an antenna 10, a receiving circuit 20, a control circuit 30, a secondary battery 40, a power supply voltage measuring unit 41, a switch 42, a solar battery 43, and a drive. A mechanism 50, a time display unit 51, and an operation unit 60 are included.

  The antenna 10 receives a satellite radio wave transmitted from a satellite as a radio wave including time information. In particular, in the present embodiment, the antenna 10 is a patch antenna that receives satellite radio waves transmitted from GPS satellites.

  The receiving circuit 20 decodes the satellite radio wave received by the antenna 10 and outputs a bit string (received data) indicating the contents of the satellite signal obtained as a result of the decoding. Specifically, the receiving circuit 20 includes a high frequency circuit (RF circuit) 21 and a decoding circuit 22.

  The high-frequency circuit 21 is an integrated circuit that operates at a high frequency, and amplifies and detects an analog signal received by the antenna 10 to convert it into a baseband signal. The decoding circuit 22 is an integrated circuit that performs baseband processing, decodes the baseband signal output from the high-frequency circuit 21, generates a bit string indicating the content of data received from the GPS satellite, and outputs the bit string to the control circuit 30. Output.

  The control circuit 30 is an information processing device such as a microcomputer, and includes a calculation unit 31, a ROM (Read Only Memory) 32, a RAM (Random Access Memory) 33, an RTC (Real Time Clock) 34, and a motor drive. Circuit 35.

  The calculation unit 31 performs various types of information processing according to programs stored in the ROM 32. Details of the processing executed by the calculation unit 31 in the present embodiment will be described later. The RAM 33 functions as a work memory of the calculation unit 31 and data to be processed by the calculation unit 31 is written. In particular, in this embodiment, a bit string (received data) representing the contents of the satellite signal received by the receiving circuit 20 is sequentially written in the buffer area in the RAM 33. The RTC 34 supplies a clock signal used for timing in the radio wristwatch 1. In the radio-controlled wristwatch 1 according to the present embodiment, the calculation unit 31 corrects the internal time measured by the signal supplied from the RTC 34 based on the satellite signal received by the reception circuit 20, and displays the time on the time display unit 51. The time to be displayed (display time) is determined. Further, the motor drive circuit 35 outputs a drive signal for driving a motor included in the drive mechanism 50 described later according to the determined display time. As a result, the display time generated by the control circuit 30 is displayed on the time display unit 51.

  The secondary battery 40 is a lithium ion battery or the like, and stores the electric power generated by the solar battery 43. Then, the accumulated power is supplied to the receiving circuit 20 and the control circuit 30. The power supply voltage detection unit 41 includes, for example, a resistor. The control circuit 30 measures the voltage of the secondary battery 40 (hereinafter referred to as power supply voltage) by a method such as measuring the current flowing from the secondary battery 40 to the power supply voltage measuring unit 41. The measured value of the power supply voltage is sent to the control circuit 30 and used for display control that warns of a decrease in power supply voltage, which will be described later.

  A switch 42 is provided in the middle of the power supply path from the secondary battery 40 to the receiving circuit 20. The switch 42 is turned on / off by a control signal output from the control circuit 30. When the control circuit 30 switches on / off of the switch 42, the operation timing of the receiving circuit 20 is controlled. The receiving circuit 20 operates only while power is supplied from the secondary battery 40 via the switch 42, and decodes satellite radio waves received by the antenna 10 during that time.

  The solar battery 43 is disposed on the back side of the dial 53, generates power by external light such as sunlight irradiated on the radio-controlled wristwatch 1, and supplies the generated power to the secondary battery 40.

  The drive mechanism 50 includes a step motor that operates in accordance with the drive signal output from the motor drive circuit 35 described above and a train wheel, and the train wheel transmits the rotation of the step motor, thereby indicating the pointer. 52 is rotated. The time display unit 51 includes a pointer 52 and a dial 53. The pointer 52 includes an hour hand 52a, a minute hand 52b, and a second hand 52c, and when the pointer 52 rotates on the dial 53, the current time is displayed.

  The operation unit 60 is a crown 60a, a push button 60b, etc., and receives an operation by the user of the radio-controlled wristwatch 1 and outputs the operation content to the control circuit 30. The control circuit 30 executes various processes according to the contents of the operation input received by the operation unit 60. In particular, in the present embodiment, the control circuit 30 performs satellite signal reception processing in accordance with an operation input to the operation unit 60 by the user.

  Hereinafter, a specific example of processing executed by the arithmetic unit 31 of the control circuit 30 in the present embodiment will be described. As shown in FIG. 3, the arithmetic unit 31 functionally executes a program stored in the ROM 32, thereby functionally acquiring a satellite signal acquisition unit 31a, a time correction unit 31b, a warning display unit 31c, and a limiting unit 31d. And realize.

  The satellite signal receiving unit 31a performs a satellite signal reception process in response to an instruction operation on the operation unit 60 by the user. Specifically, the satellite signal receiving unit 31a performs a reception process of acquiring time information data included in the satellite signal when the push button 60b is pressed for a certain period. Note that the satellite signal receiving unit 31a may periodically perform time information acquisition processing. In addition, the radio wristwatch 1 may determine the reception timing of the satellite signal according to its own radio wave reception environment (signal strength or the like).

  The time correction unit 31b corrects the internal time counted inside the radio wristwatch 1 using information received from the GPS satellite by the satellite signal reception unit 31a.

  The warning display unit 31c displays a warning to warn the user when the power supply voltage is lowered. Specifically, the warning display unit 31c periodically measures the power supply voltage by the power supply voltage measurement unit 41, and displays a warning when the measurement result falls below the first threshold value Vth1. In addition, when a warning is displayed by the warning display unit 31c, an operation that causes a heavy load (that is, an operation that consumes a large amount of power) is prohibited. The satellite signal reception processing by the satellite signal reception unit 31a is an example of an operation that causes a heavy load that is prohibited when a warning is displayed. The warning display unit 31c can perform warning display by various methods such as irregularly moving the time indicating hand 52 or using a sub-needle for status display. In the following, as an example, the warning display unit 31c displays a warning indicating a drop in the power supply voltage by moving the second hand 52c for 2 seconds (moving the second hand 52c by 2 seconds every 2 seconds). By performing such a warning display, when the secondary battery 40 needs to be charged, the radio-controlled wristwatch 1 can inform the user accordingly.

  The restriction unit 31d restricts warning display by the warning display unit 31c before the reception processing is started by the satellite signal reception unit 31a. The restricting unit 31d restricts the warning display at least before the start of the operation (first operation) involving a decrease in the power supply voltage. Specifically, the restriction unit 31d restricts the warning display by the warning display unit 31c from the time when the operation unit 60 is operated and the reception process is instructed. That is, the restricting unit 31d restricts the warning display from when the push button 60b is pressed. Thereby, even if it is a case where a voltage drop occurs by the pre-process of a radio wave reception process, an unnecessary warning display can be suppressed. At the same time, due to the suppression of the warning display, the remaining battery level is actually sufficient to perform the satellite signal reception process, but the temporary process caused by the pre-processing executed accompanying the reception process, etc. A warning is displayed due to a general voltage drop, and a situation where reception processing is prohibited is avoided. As a result, it is possible to reduce the possibility that the satellite signal reception process is prohibited and the convenience of the user is impaired although there is a sufficient remaining battery level.

  Note that the timing at which the limiting unit 31d starts limiting the warning display is not limited to the above case. The restriction unit 31d may restrict the warning display before performing at least one of the operation of starting the receiving circuit 20 for receiving satellite radio waves and the operation of tracking satellite radio waves. When the receiving circuit 20 is activated for the purpose of tracking satellite radio waves or the like, the power supply voltage is lowered. Therefore, by starting the restriction of warning display by the restriction unit 31d before that, unnecessary warning display can be suppressed.

  In addition, when displaying the result of the previous reception process after operating the operation unit 60 to instruct the reception process, the restriction unit 31d displays a warning by the warning display unit 31c before displaying the result of the previous reception process. The display may be limited. Specifically, the restricting unit 31d may restrict the warning display before moving the pointer 52 to display the result of the previous reception process. Since the power supply voltage is lowered by moving the pointer 52 such as the second hand 52c, unnecessary warning display can be suppressed by starting the warning display restriction by the restricting unit 31d before moving the hand.

  The limiting unit 31d may determine whether to limit the warning display according to the value of the power supply voltage acquired from the power supply voltage measuring unit 41. The restriction unit 31d restricts the display of a warning regarding a drop in the power supply voltage. However, when the power supply voltage drops to such an extent that the satellite signal reception process cannot be continued (the power supply voltage falls below a second threshold value Vth2 described later). ), The warning display restriction may be lifted. In such a case, the satellite radio-controlled wristwatch 1 may suspend the satellite signal reception process and return to the normal timing operation.

  The restriction unit 31d restricts the warning display for a certain period before the satellite signal reception unit 31a starts the satellite signal reception process. Here, it is desirable that the fixed period for limiting the warning display is a period from when the reception process is completed until the power supply voltage recovers to the first threshold value Vth1 or more. If the power supply voltage is less than the first threshold value Vth1 when the satellite signal receiving unit 31a starts the satellite signal reception process, the limiting unit 31d may extend the fixed period for limiting the warning display.

  FIG. 4 is a diagram showing the operations of the push button 60b (indicated as “PB” in the drawing), the receiving circuit 20, and the pointer 52 in time order. FIG. 5 is a diagram illustrating changes in the power supply voltage accompanying the reception process. 4 and 5, the horizontal axis represents time. The vertical axis in FIG. 5 represents the power supply voltage.

  In the example shown in FIGS. 4 and 5, when the push button 60b is pressed at time t0, the pointer 52 moves and indicates the success or failure of the previous reception process by indicating the reception success character 54 or the reception failure character 55. In the example shown in FIGS. 4 and 5, the timing at which the pointer 52 moves is immediately after the push button 60b is pressed. However, the timing at which the pointer 52 moves may be after a certain period of time has elapsed after the push button 60b is pressed.

  As the pointer 52 moves, the power supply voltage starts dropping from time t0. In the example shown in FIG. 5, the power supply voltage reaches the first threshold value Vth1 at time tc, and then falls below the first threshold value Vth1. Here, if there is no function of the limiting unit 31d, the warning display unit 31c that detects that the power supply voltage has fallen below the first threshold value Vth1 displays a warning regarding a decrease in the power supply voltage. However, the limiter 31d limits the warning display before the pointer 52 moves. Therefore, the user of the satellite radio-controlled wristwatch 1 is not bothered by unnecessary warning display, and the reception process itself is not prohibited due to a temporary power supply voltage drop caused by moving the hands 52.

  The restricting unit 31d may restrict the warning display between time t0 and time tc. That is, the limiting unit 31d may limit the warning display before the power supply voltage becomes less than the first threshold value Vth1. For example, the limiting unit 31d may limit the warning display when the value of the power supply voltage measured by the power supply voltage measuring unit 41 is equal to or less than a value obtained by adding a predetermined value to the first threshold value Vth1. Good.

  The display of the previous reception processing result by the pointer 52 is performed when the pointer 52 continues to indicate the reception success character 54 or the reception failure character 55. Although the power supply voltage drops during the movement, the power supply voltage starts to recover after the position of the pointer 52 is fixed. In the example of FIG. 5, the power supply voltage falls below the first threshold Vth1 after time tc, but has recovered to the extent that it exceeds the first threshold Vth1 before time t1. Thus, even when the power supply voltage exceeds the first threshold value Vth1, the limiting unit 31d may continue to limit the warning display.

  When the user of the satellite radio-controlled wristwatch 1 continues to press and hold the push button 60b, the receiving circuit 20 is activated at time t1. Time t1 is a time before time t2. Here, the time t2 is a time at which execution of the reception process is confirmed when the push button 60b is pressed for a certain period. The reception circuit 20 is activated prior to execution of satellite signal reception processing for the purpose of tracking satellite radio waves and the like. Thus, the reception process can be started promptly by starting the reception circuit 20 prior to the execution of the reception process and tracking the satellite radio wave. As a result, the overall time required for the reception process can be shortened.

The power supply voltage drops from the time t1 when the receiving circuit 20 is activated and falls below the first threshold value Vth1. After that, when the push button 60b is pressed for a certain period, execution of the reception process is started from time t2. As the reception circuit 20 performs the satellite signal reception process, the power supply voltage continues to drop from the time t2 to the time t3. In addition, the pointer 52 rotates to a position indicating the receiving character 55 at time t2 when it is determined that the reception process is to be performed. At this time, a drop in the power supply voltage due to hand movement occurs. Incidentally, the above-mentioned TOW, week number WN, and leap second information delta _LS or the like, when timing of transmission of the information required is known, may be set to the timing of the time t2.

  The length of the period during which reception processing is performed (the period from time t2 to t3 in FIG. 5) varies depending on the time required to acquire the TOW or week number WN included in the time information. Here, TOW is a numerical value that increases by 1 every 6 seconds, and the period required to acquire TOW is about 6 seconds if the satellite radio wave reception state is good. Further, since the week number WN is information transmitted at intervals of 30 seconds, the period required to acquire the week number WN is about 30 seconds if the reception state of the satellite radio wave is good.

  If the period during which the reception process is performed is prolonged, the power is continuously consumed by the reception circuit 20, and the power supply voltage may fall below the second threshold value Vth2. In such a case, the restriction unit 31d releases the restriction on the warning display. When the power supply voltage falls below the second threshold value Vth2, it is difficult to continue the reception process. Therefore, the satellite radio-controlled wristwatch 1 may interrupt the reception process and return to the normal timekeeping operation. In that case, a warning display regarding a decrease in the power supply voltage may be performed by the warning display unit 31c.

  When the reception process ends at time t3, the reception circuit 20 stops. In addition, the pointer 52 indicates the success or failure of the reception process by indicating the reception success character 54 or the reception failure character 55. Here, the power supply voltage drops due to the hand movement. The pointer 52 returns to the normal timing operation at time t4 after displaying the success or failure of the reception process for a certain period. The power supply voltage can also drop when the pointer 52 returns to normal timing operation. The restriction unit 31d restricts the warning display until at least after the end of the reception process by the satellite radio wave reception unit 31a and after the end of the operation (second operation) accompanied by a decrease in the power supply voltage. Here, the operation accompanied by a decrease in the power supply voltage after the end of the reception process is an operation for displaying the success or failure of the reception process by the pointer 52, an operation for returning to the timing operation, or the like. The power supply voltage is considered to decrease most after an operation involving a decrease in power supply voltage performed after the reception process is completed. Therefore, by limiting the warning display until after the end of the operation accompanied by a decrease in the power supply voltage performed after the reception process is completed, the warning display can be limited until the power supply voltage starts to recover. In addition, unnecessary warning display can be suppressed.

  The restriction unit 31d restricts the warning display for a certain period from before the reception process is started. Specifically, the restricting unit 31d restricts the warning display for several minutes from when the push button 60b is pressed. The period for limiting the warning display may be determined in advance, or may be changed according to the content of the reception process to be executed. Further, when starting the reception process, the restriction unit 31d may extend a certain period of time for restricting the warning display when the power supply voltage is less than the first threshold value Vth1. In the example of FIGS. 4 and 5, the power supply voltage is less than the first threshold value Vth1 at time t2 when the reception process is started. Therefore, the limiting unit 31d may extend the period for limiting the warning display. In such a case, by extending the period during which the warning display is limited, unnecessary warning display is suppressed even when it takes a relatively long time to recover the power supply voltage.

  FIG. 6 is a flowchart showing a warning display restriction process performed between the time when the push button 60b is operated and the time when the reception process is executed. FIG. 7 is a flowchart showing a warning display restriction process before and after the end of the reception process.

  When the push button 60b is pressed by the user of the satellite radio-controlled wristwatch 1 (S1), the restriction unit 31d restricts warning display by the warning display unit 31c (S2). Here, if the push button 60b is not pressed (S1), the power supply voltage is not temporarily reduced by the reception process, and thus the flow ends.

  Next, prior to the execution of the reception process, the reception circuit 20 is activated (S3). Then, when the push button 60b is kept pressed for a certain period (S4), it is determined whether or not the power supply voltage measured by the power supply voltage measuring unit 41 is less than the first threshold Vth1 (S5). Here, when it is determined that the power supply voltage is less than the first threshold value Vth1, a reservation for extending the period for limiting the warning display is made (S6), and the satellite signal reception processing by the satellite signal reception unit 31a is executed. (S7). On the other hand, when it is determined that the power supply voltage is not less than the first threshold value Vth1, the satellite signal reception process is executed without making a reservation for extending the period for limiting the warning display (S7).

  When the push button 60b is not pressed for a certain period and the long press is released (S4), it is determined whether or not a certain period has elapsed after the long press is released (S8). If the predetermined period has not elapsed, it is determined whether or not the power supply voltage is less than the first threshold value Vth1 (S9). When the power supply voltage is less than the first threshold value Vth1, recovery of the power supply voltage is awaited. If the power supply voltage is not less than the first threshold value Vth1, the restriction unit 31d releases the restriction on the warning display (S10). Further, also when a certain period of time has elapsed after releasing the long press (in the case of YES in S8), the restriction unit 31d releases the restriction of the warning display (S10). If the long press of the push button 60b is released before the lapse of a certain period, the satellite radio-controlled wristwatch 1 may return to a normal timekeeping operation.

  While the reception process is being executed, it is determined whether or not the power supply voltage is less than the second threshold value Vth2 (S11). Here, when it is determined that the power supply voltage is less than the second threshold value Vth2, the reception process is interrupted (S12). If the reception process is interrupted, the warning display restriction is released (S16), and the normal timing operation is restored. On the other hand, if the power supply voltage does not become less than the second threshold value Vth2 while the reception process is being executed and the reception process is completed (S13), the warning display restriction state is maintained until a predetermined period has elapsed. It is drunk (S14). When a certain period for limiting the warning display has passed (S14), the warning display restriction state is maintained until the extended period elapses (S15). If the extension reservation (S6) is performed, the extension period is set to a period having the same length as a certain period for limiting the warning display, for example. On the other hand, if no extension reservation is made, the extension period is zero. Thereafter, the limitation on the warning display is released (S16), and the normal timing operation is restored. When determining whether or not a certain period has elapsed after the end of the reception process (S14), it may be determined whether or not the power supply voltage is equal to or higher than the first threshold value Vth1. This is because, while waiting for the elapse of a certain period, power is generated by the solar battery 43, and the power supply voltage may be restored to the first threshold value Vth1 or more. If the power supply voltage is equal to or higher than the first threshold value Vth1, the warning display restriction may be canceled and the normal timekeeping operation may be resumed even before a certain period of time has elapsed. Also, when determining whether or not the extended period has elapsed (S15), it is also determined whether or not the power supply voltage is equal to or higher than the first threshold value Vth1, and if the power supply voltage is equal to or higher than the first threshold value Vth1. For example, the warning display restriction may be canceled and the normal timekeeping operation may be resumed even before the extension period has elapsed.

[Second Embodiment]
8 and 9 are flowcharts showing warning display restriction processing performed in the satellite radio-controlled wristwatch 1 according to the second embodiment of the present invention. The configuration of the satellite radio wave wristwatch 1 according to the second embodiment is the same as that of the satellite radio wave wristwatch 1 according to the first embodiment, but the method for instructing the satellite signal reception process is different, and the satellite signal reception process is started. The operation to be performed before is different. In the satellite radio-controlled wristwatch 1 according to the present embodiment, when the first push button (the push button 60b provided in the 2 o'clock direction in FIG. 1) is pressed, the normal time display is shifted to the power generation amount monitor display. Thereafter, when there is no operation for a certain period (for example, 10 seconds), the normal time display is restored. In addition, when the second push button (push button 60b provided in the 4 o'clock direction in FIG. 1) is pressed during normal time display or power generation amount monitor display, the display shifts to reception monitor display. When the second push button is further pressed during the reception monitor display, satellite signal reception processing is executed.

  Hereinafter, processing performed when the second push button is pressed during the normal timing display will be described with reference to the flowchart of FIG. 8. First, the satellite radio-controlled wristwatch 1 performs normal time display (S20). Therefore, when the first push button is not pressed (S21) and the second push button is pressed (S22), the warning display is limited by the limiting unit 31d (S23). In this way, by limiting the warning display immediately after the operation of the push button 60b is performed, the satellite signal reception process can be executed as much as possible within the range that the remaining battery level allows. Even when the warning display is being restricted, if the power supply voltage is lower than Vth2, the normal time display may be forcibly restored, the warning display may be performed, and the satellite signal reception process may be prohibited.

  Thereafter, reception monitor display is performed (S24). As described above, the reception monitor display can be performed by indicating the goodness of the reception state of the satellite radio wave by the patch antenna or the like with the second hand 52c or the like. While the reception monitor display is being performed, it is determined whether or not the second push button has been pressed (S25). When the second push button is pressed, a reception process is executed (S26). When the reception process is executed, it is determined whether or not a certain period (for example, 120 seconds) has elapsed since the start of the reception process (S27). When it is determined that a certain period has elapsed, the warning display restriction is released (S28), and the satellite radio-controlled wristwatch 1 returns to the normal time display (S29). Here, as with the satellite radio-controlled wristwatch 1 according to the first embodiment, the power supply voltage is measured immediately before the execution of the reception process (S26), and if it falls below Vth1, the warning display limit period is extended. Also good. When determining whether or not a certain period has elapsed after the execution of the reception process (S27), it is also determined whether or not the power supply voltage is equal to or higher than the first threshold value Vth1, and the power supply voltage is set to the first threshold value Vth1. If it is above, it is good also as canceling | restricting a warning display and returning to normal time measuring operation | movement, even if it is before a fixed period progress.

  If the second push button is not pressed after the reception monitor is displayed, it is determined whether or not a certain period (for example, 10 seconds) has elapsed (S30). When the fixed period has elapsed, the warning display restriction is canceled (S28), and the satellite radio-controlled wristwatch 1 returns to the normal time display (S29). When determining whether or not a certain period has elapsed (S30), it is also determined whether or not the power supply voltage is equal to or higher than the first threshold value Vth1, and if the power supply voltage is equal to or higher than the first threshold value Vth1, Even before a certain period of time has elapsed, the warning display restriction may be canceled and the normal timekeeping operation may be restored.

  FIG. 9 shows processing performed when the first push button is pressed during normal time display in the flowchart shown in FIG. 8 (S21). When the first push button is pressed, the warning display is restricted by the restriction unit 31d (S31). In this way, by limiting the warning display immediately after the operation of the push button 60b is performed, the satellite signal reception process can be executed as much as possible within the range that the remaining battery level allows. Even when the warning display is being restricted, if the power supply voltage is lower than Vth2, the normal time display may be forcibly restored, the warning display may be performed, and the satellite signal reception process may be prohibited.

  Thereafter, the power generation amount monitor display is performed (S32). As described above, the power generation amount monitor display can be performed by pointing the current amount generated by the solar cell 43 with the second hand 52c or the like. While the power generation amount monitor display is being performed, the first push button is not pressed (S33), and when the second push button is pressed (S34), the reception monitor display is performed (S24). The subsequent processing is shown in FIG. 8 and is as described above.

  While the power generation amount monitor display is being performed, both the first push button and the second push button are not pressed, and when a certain period (for example, 10 seconds) elapses, the warning display restriction is released (S36). Thereafter, the satellite radio-controlled wristwatch 1 returns to the normal time display (S37).

  When the first push button is pressed while the power generation amount monitor display is being performed (S33), the warning display restriction is released without waiting for a certain period of time (S36). Thereafter, the normal time display is restored (S37).

  Note that the first push button is not pressed (S21), the second push button is pressed (S22), the warning display is restricted (S23), and the reception monitor is displayed (S24). When the first push button is pressed, the processing after the power generation amount monitor display (S32) in the flowchart shown in FIG. 9 may be performed. That is, when the first push button is pressed after the second push button is pressed and the reception monitor is displayed, the display may be shifted from the reception monitor display to the power generation amount monitor display. In such a configuration, it is possible that the first push button is accidentally pressed after the second push button is pressed. It is good also as changing to quantity monitor display.

  Note that the embodiments of the present invention are not limited to those described above. For example, in the above description, the case of so-called forced reception in which the user executes a satellite signal reception process by operating the push button 60b or the like of the satellite radio wave wristwatch 1 is described. In addition to or instead of this, satellite signals may be automatically received. Automatic reception indicates a case in which reception processing is started without an explicit operation by the user. For example, scheduled reception in which periodic reception processing is performed or an environment (antennas) in which the satellite radio-controlled wristwatch 1 is placed. An example of automatic reception is environment reception in which reception processing is performed according to 10 radio wave reception states, the amount of power generated by the solar battery 43, and the like. Even in the case of automatic reception, the warning display by the warning display unit 31c may be restricted before the satellite radio wave reception process is started. For example, the warning display may be limited before starting the receiving circuit 20 for automatic reception of satellite radio waves.

  When the satellite radio-controlled wristwatch 1 performs automatic reception, a notice of reception processing for the user can be further cited as a process that causes a temporary voltage drop that should limit the warning display. This notice can be performed by moving the pointer, sound, vibration, etc., but by limiting the warning display before such notice, it is sufficient to perform satellite signal reception processing as in the above example. It is possible to reduce the situation where the reception process is prohibited and the time information is not corrected despite the remaining battery level.

  In the above description, the satellite radio-controlled wristwatch 1 has the built-in secondary battery 40 and is operated by the power supplied by the secondary battery 40. However, the satellite radio-controlled wristwatch 1 has a primary battery instead of the secondary battery 40. It is good also as incorporating. Also in this case, the present invention can be applied as long as the battery voltage of the primary battery is temporarily reduced by the radio wave reception process.

  DESCRIPTION OF SYMBOLS 1 Satellite radio wave watch, 10 Antenna, 20 Receiving circuit, 21 High frequency circuit, 22 Decoding circuit, 30 Control circuit, 31 Operation part, 31a Satellite signal receiving part, 31b Time adjustment part, 31c Warning display part, 31d Restriction part, 32 ROM 33 RAM, 34 RTC, 35 Motor drive circuit, 40 Secondary battery, 41 Power supply voltage measurement unit, 42 Switch, 43 Solar cell, 50 Drive mechanism, 51 Time display unit, 52 Pointer, 52a Hour hand, 52b Minute hand, 52c Second hand , 53 dial plate, 54 reception success character, 55 reception failure character, 56 receiving character, 60 operation unit, 60a crown, 60b push button.

Claims (9)

A radio wave receiver for receiving radio waves including time information;
A warning display that displays a warning when the voltage of the built-in power supply drops,
Before starting the reception process of the radio wave by the radio wave reception unit, a limiting unit that limits the display of the warning by the warning display unit,
A radio clock equipped with. The radio timepiece according to claim 1, wherein the limiter limits the display of the warning at least before the start of the first operation accompanied by a decrease in the voltage of the power supply. The radio-controlled timepiece according to claim 2, wherein the first operation is at least one of an operation of starting a receiving circuit for receiving the radio wave and an operation of tracking a satellite radio wave including the radio wave. Further comprising a guideline indicating information on reception of the radio wave,
The radio timepiece according to claim 2, wherein the first operation is an operation of moving the hands. The restriction unit restricts display of the warning at least after the reception of the radio wave by the radio wave reception unit and after the end of the second operation accompanied by a decrease in the voltage of the power supply. The radio timepiece according to claim 1. Further comprising a guideline indicating information on reception of the radio wave,
The radio timepiece according to claim 5, wherein the second operation is an operation of moving the hands. The warning display unit displays the warning when the voltage of the power source is less than a first threshold;
The said restriction | limiting part restrict | limits the display of the said warning when the voltage of the said power supply is less than the said 1st threshold value and is more than the 2nd threshold value smaller than the said 1st threshold value. Radio clock. The radio timepiece according to claim 7, wherein the limiting unit limits the display of the warning for a certain period of time before the radio wave receiving unit starts receiving the radio wave. The radio timepiece according to claim 8, wherein when the radio wave reception unit starts receiving the radio wave, the limiting unit extends the certain period when the voltage of the power source is less than the first threshold. .

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