Body-worn device, determination method, and program

Abstract

To provide a more user-friendly body-worn device, a determination method, and a program.SOLUTION: The body-worn device includes a pH sensor (241), a pressure sensor (242), and a CPU (11). The CPU (11) combines the measurement result of the pH sensor (241) and the measurement result of the pressure sensor (242) to determine the type of activity. The CPU (11) may determine whether the type of the activity is open swim on the basis of the measurement result of the pH sensor (241).SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to a body-worn device, a determination method, and a program.

Background Art

[0002] Patent Document 1 discloses a list computer including a clock, a display, an operation input unit that receives user input, and a control unit that switches modes according to a mode switching operation by user input.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, there is a problem that it is difficult to automatically switch modes without user setting.

[0005] An object of this invention is to provide a more user-friendly body-worn device, determination method, and program.

Means for Solving the Problems

[0006] To achieve the above object, this invention is a pH sensor, a pressure sensor, a control unit that determines the type of activity by combining the measurement result of the pH sensor and the measurement result of the pressure sensor during operation in the activity mode, and is a body-worn device comprising the above.

Effects of the Invention

[0007] According to the present invention, there is an effect that the usability of the body-worn device is improved.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the functional configuration of an electronic clock 1 which is an example of the body-worn device of the present embodiment.

[0010] The electronic clock 1 includes a microcomputer 10, a display unit 21, an operation reception unit 22, a communication unit 23, a measurement unit 24, etc. The microcomputer 10 comprehensively controls the overall operation of the electronic clock 1. The microcomputer 10 includes a CPU 11 (Central Processing Unit), a RAM 12 (Random Access Memory), a memory 13, an oscillation circuit 14, a frequency division circuit 15, a timekeeping circuit 16, a timer circuit 17, etc.

[0011] The CPU 11 is a processor that performs arithmetic processing to carry out control operations and corresponds to the control unit of the present embodiment. The CPU 11 may have a single processor, or may have a plurality of processors, and the plurality of processors may operate in parallel or independently according to applications and the like.

[0012] The RAM 12 provides a working memory space for the CPU 11 and stores temporary data. The RAM 12 is, for example, a DRAM, but is not limited thereto.

[0013] The memory 13 is a non-volatile memory and may be, for example, a flash memory. The memory 13 stores a program 131 and various setting data and the like. The setting data includes pH reference data 132 described later.

[0014] The oscillation circuit 14 generates and outputs a clock signal having a frequency corresponding to an externally attached oscillator, for example, a crystal oscillator. The frequency division circuit 15 divides the above clock signal into signals having frequencies that each part of the electronic clock 1 can use. The frequency division circuit 15 may be capable of generating a plurality of frequencies used by the electronic clock 1.

[0015] The timing circuit 16 obtains the current time by counting and adding signals having a certain frequency obtained by the frequency division circuit 15. The current time may include a date. The operation of the timing circuit 16 may be executed by the CPU 11 software-wise. The timer circuit 17 counts the set time and outputs a signal such as an interrupt signal to the CPU 11 when the counting is completed.

[0016] The display unit 21 may have a digital display screen. Alternatively, the display unit 21 may have a pointer display unit including a plurality of pointers, a wheel train mechanism that is a series of gears that rotate the pointers in conjunction with each other, and a stepping motor that rotates the wheel train mechanism. The display unit 21 may have both a digital display screen and a pointer display unit.

[0017] The operation reception unit 22 includes operation devices such as push button switches and dials, detects operations of the operation devices, and outputs detection signals to the CPU 11. When the display unit 21 has a digital display screen, the operation reception unit 22 may have a touch panel superimposed on the digital display screen.

[0018] The communication unit 23 controls communication with external devices. The communication unit 23 may include, for example, a control module that controls short - range wireless communication. Examples of short - range wireless communication include, for example, Bluetooth (registered trademark) and / or Wireless LAN (Local Area Network).

[0019] The measurement unit 24 has sensors for measuring physical quantities, and outputs and transmits the detection results of the sensors to the CPU 11. The sensors include a pH sensor 241 (first sensor) for detecting pH. The pH sensor 241 may be, for example, a sensor using an ion - exchange FET (ISFET). For example, a small - sized pH sensor using an ISFET is disclosed in, for example, International Publication No. 2017 / 110889. The pH sensor 241 may be, for example, one using a conventionally known optical sensor as long as it can be built into the electronic clock 1. When there is no water to be measured, for example, noise is output from the pH sensor 241, so it may be activated only when it is determined that it is in contact with water.

[0020] Also, in this embodiment, the sensors include a pressure sensor 242. In addition to this, the sensors may include some or all of an acceleration sensor 244, a gyro sensor 245, a geomagnetic field sensor 246, an illuminance sensor 247, etc. Other sensors capable of measuring physical quantities other than pH, such as the state, movement of the user wearing the electronic clock 1 (own device), and / or the surrounding environmental state, may be included in the second sensors of this embodiment.

[0021] The pressure sensor 242 has a detection range capable of detecting water pressure. The water pressure referred to here is not limited to hydrostatic pressure, and may be capable of detecting pressure changes associated with movements of the arm according to underwater operations. Further, the pressure sensor 242 may also include a sensor having a detection range capable of detecting atmospheric pressure. The pressure sensor 242 may be, for example, a semiconductor sensor.

[0022] The measurement unit 24 may further include a satellite radio wave reception processing unit 243. The satellite radio wave reception processing unit 243 receives radio waves from positioning satellites related to GNSS (Global Navigation Satellite System) such as GPS (Global Positioning System), and acquires signals from the received radio waves. The satellite radio wave reception processing unit 243 performs a positioning calculation based on the signals received and acquired from a plurality of positioning satellites, and specifies the current position of the own device. Each sensor of the measurement unit 24 and the satellite radio wave reception processing unit 243 may be separately located. Each sensor may be at a position suitable for measurement, and the satellite radio wave reception processing unit 243 may be at a position where its antenna is suitable for radio wave reception.

[0023] FIG. 2 is a diagram showing a part of the cross-sectional structure of the electronic clock 1. This cross-section is a cross-section including the pH sensor 241. As an exterior member, the electronic clock 1 includes a cylindrical case 41, a glass 42 (windshield member) that closes the upper part above the display surface on the upper end side of the case 41, a back cover 43 that closes the lower end side of the case 41, a bezel 44 (exterior member) located on the upper peripheral edge of the case 41, and the like.

[0024] Inside the case 41, a substrate 45 and a dial 46 are located. The substrate 45 and the dial 46 are held at appropriate positions by a housing 47.

[0025] The substrate 45 includes various electronic components, an electric circuit, and connection terminals (connectors). The above-mentioned sensors, a crystal oscillator, a battery, etc. are connected to the connection terminals. The battery may be a solar cell, a dry battery, a rechargeable battery, or the like. Also, a solar cell and a rechargeable battery may be used in combination.

[0026] The dial plate 46 is positioned so as to be visible through the glass 42 below the plurality of pointers. On the upper surface of the dial plate 46, there may be positioned a mark (hour characters) representing the content indicated by the direction in which each pointer rotates.

[0027] The case 41 is sealed inside by the glass 42 and the back cover 43. When sealing, a waterproof member such as a packing may be positioned between the case 41, the glass 42, the back cover 43, etc. Further, the case 41 has a through hole for drawing out the operation device and the measurement unit 24 to the outside. The pH sensor 241 is positioned near the side surface of the electronic clock 1. The pH sensor 241 is positioned outside the case 41 and is connected to the connection terminal 451 of the substrate 45 through a flexible printed circuit board 48 (FPC) passing through the through hole of the case 41. The flexible printed circuit board 48 is supported by a guide member 49 and also prevents water from entering the case 41 by a packing 50. The packing 50 may sandwich the flexible printed circuit board 48 from both sides according to the size of the flexible printed circuit board 48 or the like. Alternatively, the packing 50 may have a circumferential structure surrounding the flexible printed circuit board 48.

[0028] At this side surface position, the pH sensor 241 can measure the pH of the surrounding water when the electronic clock 1 is immersed in water while excluding sweat and the like.

[0029] Next, the activity detection operation in the electronic clock 1 will be described. The electronic clock 1 of this embodiment detects a feature amount corresponding to the type of activity of the user wearing the electronic clock 1, measures the amount of exercise, and also identifies its quality, the state of the user during exercise, and the like. The electronic clock 1 shifts to an activity mode in which a feature amount corresponding to the type of activity is detected in response to an input operation to the operation reception unit 22 by the user, and the type of activity and its measurement content may be determined. On the other hand, the electronic clock 1 may automatically detect the start of an activity, shift to the activity mode, determine the type of activity, and start or continue the measurement. The automatic determination can be effectively used, for example, when it is troublesome for the user to perform a manual operation or when the type of activity is switched midway.

[0030] The electronic clock 1 uses the measurement values of the respective sensors of the measurement unit 24 to determine the type of activity being performed by the user. By using the acceleration sensor 244, it is possible to determine whether the user is in motion. In addition, by using the acceleration sensor 244 and the gyro sensor 245 in combination, it is possible to determine the swimming style of swimming. In addition to sensors that measure motion such as the acceleration sensor 244 and the gyro sensor 245, the combination of the pH sensor 241 can obtain information on the water quality in particular. Further, for example, by using the pressure sensor 242, a water pressure greater than the atmospheric pressure is detected, so that activities in water, particularly swimming, are included in the determination target. At this time, by further using the pH sensor 241, it is possible to determine whether the place where swimming is performed is the sea, that is, whether it is open swimming.

[0031] FIG. 3 is a flowchart showing the control procedure of the activity detection process executed by the CPU 11 of the electronic clock 1. This process including the determination method of this embodiment is read out from the program 131 at a certain time interval and repeatedly performed, for example, in an operation mode in which an activity is automatically detected in response to a user operation.

[0032] The CPU 11 acquires the measurement results of each sensor including the pH sensor 241, the pressure sensor 242, and the acceleration sensor 244 from the measurement unit 24 (S1; acquisition means). As described above, the measurement by the pH sensor 241 may not be performed in a situation where contact with water is not detected.

[0033] Based on the acquired measurement results, the CPU 11 determines whether the user is in a motion state (S2). The motion state does not necessarily have to be continuous movement. For example, it is specified by measuring an acceleration change or a change in the inertial state of a magnitude equal to or greater than a reference for a certain period of time. In this case, the motion state is not limited to the implementation of a specific sport, etc., and may include play, housework, etc.

[0034] When it is determined that the user is not in a motion state (S2; N), the CPU 11 sets that the user is in an inactivity state (S11). Then, the CPU 11 ends the activity detection process. Note that if the user is already in an activity state and it has been determined that the motion type involves intermittent operation, the CPU 11 does not necessarily have to immediately transition to the inactivity state. In this case, for example, a transition period corresponding to the motion type may be defined, and when no activity operation is detected for a period longer than the transition period, the user may transition to the inactivity state.

[0035] When it is determined that the user is in a motion state (S2; Y), the CPU 11 determines whether a pressure equal to or higher than a reference pressure is detected based on the measurement result of the pressure sensor 242 (S3). The reference pressure is higher than the atmospheric pressure and is a reference water pressure corresponding to an appropriate water pressure. The reference pressure may be able to distinguish the pressure of water contacted during housework or the like from the water pressure received during swimming. When it is determined that the reference pressure is not detected (S3; N), the CPU 11 detects ground activity (S12). Ground activities may include, for example, continuous activities such as walking, running, cycling, mountain climbing, etc. In addition to this, ground activities may include repetitive sports such as tennis, badminton, table tennis, etc. The CPU 11 performs a dehydration determination process described later with reference to FIG. 7 (S13). When the dehydration determination process is completed, the CPU 11 ends the activity detection process.

[0036] When it is determined that the water pressure is detected (S3; Y), the CPU 11 operates the pH sensor 241 to acquire the measurement result of the pH (S4). As described above, the pH sensor 241 may be stopped until it branches to Y in process S3. Also, the operation of the pH sensor 241 may be performed only once when it is activated. The CPU 11 determines whether the pH is equal to or higher than a reference value (S5). The reference value is a value capable of distinguishing weak alkalinity and neutrality, and may be, for example, an appropriate value greater than 7 and less than 9.

[0037] When it is determined that the pH is not equal to or higher than the reference value (S5; N), the CPU 11 determines that the detected water is not seawater (S6). That is, it is determined that the activity is not carried out in the sea. The CPU 11 sets it to the pool swim activity state (S7). The pool swim activity is a type of exercise that involves traveling back and forth along a specified course in a swimming pool. In this activity, the distance swum for each turn according to the swimming style specified by the change pattern of acceleration or the like is added up. Then, the CPU 11 ends the activity detection process. Note that after it is determined as the pool swim activity, if no turn or the like is detected within a specified time, the determination may be canceled. Thereby, cases where contact with water is detected during water play or housework can be excluded. The above processes S3 to S9 correspond to the functions as the determination means in the program 131 of the present embodiment.

[0038] When it is determined that the pH is equal to or higher than the reference value (S5; Y), the CPU 11 determines that the detected water is seawater (S8). The CPU 11 sets it to the open swim activity state (S9). That is, it is determined that the activity is carried out in the sea. The open swim activity is a type of exercise assuming swimming (long-distance swimming) in the ocean. In this activity, the positioning operation is performed at appropriate intervals by the satellite radio wave reception processing unit 243 to calculate the distance swum. Then, the CPU 11 ends the activity detection process. In this case, for example, if it is clear that the current position specified by the satellite radio wave reception processing unit 243 is not in the sea, the determination may be canceled. Also, diving or the like can be distinguished by the fact that the water pressure becomes significantly higher than near the sea surface.

[0039] When the type of activity is specified as described above, the electronic clock 1 measures and analyzes feature amounts corresponding to the specified activity, and evaluates the amount and quality of the activity. These processes may be performed in the same manner as is well known in the art. The end of the activity measurement may be performed by an input operation to the operation reception unit 22 by the user. Alternatively, when an operation or feature amount specific to the activity has not been detected for a reference time or more, the electronic clock 1 may automatically end the measurement of the activity. The reference time may be set to be longer than the break time for an activity type in which breaks are generally included in the middle.

[0040] Although the functional configuration of the electronic clock 1 is shown in the block diagram of FIG. 1, an electronic clock 1a of another example having a functional configuration as shown in the block diagram of FIG. 4 may also be used. The electronic clock 1a stores a pH conversion table 133 in the memory 13 instead of the pH reference data 132. Further, in another example, the measurement unit 24a has a temperature sensor 248 and a humidity sensor 249 in addition to each sensor of the measurement unit 24 of the above embodiment.

[0041] The temperature sensor 248 and the humidity sensor 249 may mainly be for measuring the environmental state around the electronic clock 1a. Therefore, the temperature sensor 248 and the humidity sensor 249 may be located on the side surface of the electronic clock 1a so as to be less affected by the temperature of the wrist and sweating as much as possible.

[0042] Further, in another example, the pH sensor 241 is located on the back cover side of the electronic clock 1a so as to be able to measure the sweat of the user. The pH sensor 241 can also determine by itself whether or not it is in contact with moisture including sweat, and outputs a detection error or the like when not in contact with moisture. That is, since the pH sensor 241 is located on the back cover side, it is easier to detect the pH of sweat. Even if the pH sensor 241 is located on the back cover side in this way, if the wrist is put into water, the pH sensor 241 can measure the pH of the water in which the wrist is immersed instead of sweat. Note that the pH sensor 241 may have both the above-described back cover side sensor and the side surface sensor.

[0043] Further, the electronic clock 1a may include a notification operation unit 25. The notification operation unit 25 may have a piezoelectric element that emits a beep sound, a motor that generates vibration, etc. The notification operation unit 25 uses these beep sounds, vibrations, etc. to notify the user of some information. The specific notification content may be combined with the display on the display unit 21. In addition, the notification operation unit 25 may have a speaker that emits sound, an LED light that emits light, etc. The display unit 21 and the notification operation unit 25 correspond to the output unit of the present embodiment.

[0044] FIG. 5 is a cross-sectional view showing a part of the cross-sectional structure including the pH sensor 241 in the front-back direction of the electronic clock 1a. The electronic clock 1a has an opening in the back cover 43, and the pH sensor 241 is drawn out to the surface (bottom surface side) of the back cover 43 via the flexible printed circuit board 48. A guide member 49 is embedded in the opening of the back cover 43, and a waterproof packing 50 is positioned between the guide member 49 and the flexible printed circuit board 48. Thereby, the intrusion of moisture into the case 41 is prevented.

[0045] The pH sensor 241 is located within the stepped surface of the back cover 43 and does not protrude from the surface of the back cover 43, and may or may not contact the user's wrist according to the user's wearing state, etc.

[0046] The operation using the pH sensor 241 of the electronic clock 1a will be described. It is known that the pH value of sweat changes according to the amount of lactic acid mixed in the sweat. Along with this, when the total load of exercise is too high compared to the user's ability, the amount of lactic acid increases and the pH value tends to rise. For example, when the user selects and operates an end command for an activity, the electronic clock 1a measures the pH value of sweat at the end of the activity and determines the degree of exercise overload.

[0047] Also, when the user approaches a state of dehydration, the ratio of lactic acid remaining compared to moisture increases, and the pH value also tends to rise. The electronic clock 1a can determine the degree of dehydration by measuring the pH value at appropriate intervals, not limited to during activity execution. The likelihood of dehydration depends on the ambient temperature and humidity. Therefore, the measurement presence or absence and measurement frequency by the pH sensor 241, that is, the determination frequency of the degree of dehydration state, may be changed according to the measured values (environmental conditions) of the temperature sensor 248 and the humidity sensor 249. Also, the measurement frequency may increase as the pH value approaches the dehydration state.

[0048] The pH conversion table 133 stores at least one of a table associating the pH value with the degree of the user's overload and a table associating the pH value with the degree of dehydration. The load amount and the degree of dehydration may be represented by numerical values or may be represented by symbols or the like for steps. Here, as an example, it is assumed that the higher the numerical value, the higher the degree of overload or the degree of dehydration. Note that the pH values corresponding to these degrees of overload and degrees of dehydration change according to age. Therefore, the electronic clock 1a holds offset values for the degree of overload and the degree of dehydration according to age information and the like registered separately. When referring to the table, the electronic clock 1a may obtain the degree of overload or the degree of dehydration corresponding to the pH value and output, as a determination result, a value or a step corrected by the above offset value.

[0049] FIG. 6 is a flowchart showing the control procedure of the exercise load evaluation process executed by the CPU 11. This load evaluation process is executed once for the activity when, for example, an end command for measuring the activity is acquired.

[0050] The CPU 11 operates the pH sensor 241 to obtain the measurement result of the pH value (S21). The CPU 11 refers to the pH conversion table 133 and converts the obtained pH value into the degree of overload. The CPU 11 may correct the degree of overload according to the user's age information as described above (S22). The CPU 11 outputs the obtained degree of overload (S23). The output destination is, for example, the display screen of the display unit 21, but is not limited thereto. The obtained degree of overload may be output to an external device via the communication unit 23. Then, the CPU 11 ends the load evaluation process.

[0051] Figure 7 is a flowchart showing the control procedure of the dehydration determination process executed by the CPU 11. This dehydration determination process is called and executed within the activity detection process as described above.

[0052] The CPU 11 operates the pH sensor 241 to obtain the measurement result of the pH value (S31). The CPU 11 determines whether the obtained result is an error (S32). If it is determined that the obtained result is an error (S31; Y), the process of the CPU 11 transfers to process S37.

[0053] If it is determined that the obtained result is not an error, that is, it is a normal pH value (S32; N), the CPU 11 refers to the pH conversion table 133 and obtains the dehydration degree corresponding to the pH value (S33). The CPU 11 may correct the dehydration degree according to the age information and the like. The CPU 11 stores the obtained dehydration degree in the memory 13 as a history together with the information of the measurement time (S34).

[0054] The CPU 11 acquires environmental information (S35). The environmental information is, for example, temperature information or humidity information. The temperature information and humidity information may be obtained by the temperature sensor 248 and the humidity sensor 249, or may be obtained by acquiring weather information or the like from an external device via the communication unit 23. In this case, the communication unit 23 corresponds to the weather information acquisition unit of the present embodiment. The weather information may include the rainfall situation in the area including the position of the own device. When acquiring environmental information from an external device, it may be determined whether the electronic clock 1a is outdoors or not. For the determination, for example, the illuminance sensor 247 or the like may be used. On the other hand, when the external device is an electronic device carried together with the electronic clock 1a such as a smartphone, the electronic clock 1a itself does not necessarily have detailed area information of the current position.

[0055] The CPU 11 determines whether the surrounding environment is within the reference range (S36). The reference mainly depends on humidity. If the humidity is too high, sweat does not evaporate, so the amount of lactic acid does not easily increase, and the pH value does not increase compared to the actual increase in the degree of dehydration. On the contrary, if the humidity is too low, the evaporation of sweat is fast, so the amount of lactic acid is likely to be measured more. In addition, factors such as the ease of sweating may also be considered according to the temperature and the like. Also, during rainfall, there may be a case where rain is measured as sweat. Therefore, in the case of rainfall, it may be considered not to be within the reference range. When the surrounding environment is not within the reference range, it is presumed that the determination accuracy drops below the reference.

[0056] When it is determined that the surrounding environment is not within the reference range (S36; N), the CPU 11 performs a notification operation indicating that the determination accuracy of the degree of dehydration has decreased (S37). Then, the process of the CPU 11 proceeds to process S38. When it is determined that the surrounding environment is within the reference range (S36; Y), the process of the CPU 11 proceeds to process S38.

[0057] When shifting to process S38, the CPU 11 determines whether or not the degree of dehydration is equal to or higher than a reference (S38). If it is determined that the degree of dehydration is equal to or higher than the reference (S38; Y), the CPU 11 causes the notification operation unit 25 to perform a notification operation according to the degree of dehydration (S39). Then, the process of the CPU 11 shifts to process S40. If it is determined that the degree of dehydration is not equal to or higher than the reference (S38; N), the process of the CPU 11 shifts to process S40. Note that when the ambient temperature is high as described above, the pH value tends to rise relatively. Therefore, the reference may be changed according to the temperature or the like.

[0058] In process S40, the CPU 11 sets the measurement timing of the next pH value (S40). The measurement of the pH value may be set at intervals according to the degree of the dehydration state, the surrounding environment, or the like. For example, when the degree of the dehydration state approaches or is equal to or higher than the reference, or when the ambient temperature is such that dehydration is likely to occur, the measurement interval may be narrowed according to the degree of the dehydration state or the ambient temperature. That is, the frequency of measurement of the pH value and the determination of the degree of the dehydration state increases.

[0059] The CPU 11 determines whether or not an end command for the activity has been acquired (S41). If it is determined that the end command has been acquired (S41; Y), the CPU 11 ends the dehydration determination process and returns the process to the activity detection process.

[0060] If it is determined that the end command for the activity has not been acquired (S41; N), the CPU 11 determines whether or not it is the set measurement timing (S42). If it is determined that it is not the measurement timing (S42; N), the process of the CPU 11 returns to process S41. If it is determined that it is the measurement timing (S42; Y), the process of the CPU 11 returns to process S31.

[0061] Note that the user may manually execute the dehydration determination process by performing a predetermined input operation on the operation reception unit 22. In this case, processes S40 to S42 are omitted, and the determination may not be repeated automatically. Further, the dehydration determination process may be executed automatically or in response to a user operation even when the activity is not being executed. A user is more likely to develop dehydration symptoms during exercise than when not exercising. Therefore, the criterion for switching the presence or absence of notification of the degree of dehydration may be changed according to whether the user is exercising or not. When the CPU 11 determines that the user is exercising or that the pH increase rate is equal to or higher than the threshold value, the CPU 11 can issue a notification indicating that the user is in a dehydrated state or approaching a dehydrated state earlier than when the user is not exercising or the pH increase rate is lower than the threshold value. In this case, the CPU 11 can issue a notification based on a lower criterion, that is, a pH value, than when the user is not exercising or the pH increase rate is lower than the threshold value.

[0062] The electronic timepiece 1a may also determine other states such as a stress state based on sweat. For example, when the pH value of the sweat that has occurred has increased even though the measurement unit 24 has not detected the user's exercise, it may be determined that the user is under mental stress. Also in this case, the electronic timepiece 1a may determine based on the environmental information whether the temperature and humidity are lower as the sweating increases even without any operation. When sweating occurs in a situation where it is normally difficult to sweat and the pH value has decreased, it may be determined that there is a high possibility that the sweating is due to the stress of the user.

[0063] As described above, the electronic timepiece 1 of the present embodiment includes a pH sensor 241, a pressure sensor 242, and a CPU 11. The CPU 11 combines the measurement result of the pH sensor 241 and the measurement result of the pressure sensor 242 during operation in the activity mode to determine the type of activity that the user is performing. In this way, by adding the pH sensor to the determination of the type of activity, the types that can be determined in activities using water increase. On the other hand, in the case of sweating or handwashing, since the water pressure does not increase, it is impossible to determine whether it is in water only with the pH sensor 241. Therefore, by using the pressure sensor 242, it is possible to determine whether the electronic timepiece 1 is in water. Thus, the electronic timepiece 1 can automatically determine more types of activities, and the measurement of activities can be switched more accurately without the user having to trouble. Therefore, the usability of the electronic timepiece 1 is improved.

[0064] Further, the CPU 11 may determine whether the type of activity is open swim based on the measurement result of the pH sensor 241. Even in the case of swimming, by measuring separately between pool swim and open swim, the measurement accuracy can be improved. Also, since the availability of satellite positioning can be easily switched, the measurement of exercise amount can be made more efficient.

[0065] Further, when the pressure sensor 242 detects a pressure equal to or higher than the reference pressure, the CPU 11 determines whether it is fresh water or salt water based on the measurement result of the pH sensor 241. By being able to specify the salt concentration of the detection location, it is determined whether the activity is in the sea or not. Thereby, it becomes possible to effectively measure exercise in open water swimming or triathlon, etc. Also, in the electronic timepiece 1, particularly in triathlon, the switching of the measurement content between a plurality of events is appropriately performed.

[0066] Further, when the pressure sensor 242 detects a pressure equal to or higher than the reference pressure, the CPU 11 may determine the type of activity based on the measurement result of the pH sensor 241. In water, the water pressure is significantly greater than the atmospheric pressure. Therefore, by using the pressure sensor 242, it is possible to easily determine whether it is an activity related to water. When it is an activity related to water, by operating the pH sensor 241, the electronic clock 1 does not operate the pH sensor 241 unnecessarily when not in contact with moisture. As a result, the electronic clock 1 can efficiently utilize the pH sensor 241.

[0067] Also, the pH sensor 241 may operate once when the pressure sensor 242 detects a pressure equal to or higher than the reference pressure. The measured value of pH does not change significantly during contact in normal activities. Therefore, the electronic clock 1 can obtain the necessary information while reducing power consumption with the required number of operations of the pH sensor 241.

[0068] Also, when the pressure sensor 242 detects a pressure less than the reference pressure, the CPU 11 may determine that it is a ground activity. Since there is no water pressure, it can be easily determined that the activity is not being performed in water.

[0069] In addition to or instead of the above, the pH sensor 241 may be able to measure the pH of the user's sweat. Based on the measurement result of the pH sensor 241, the CPU 11 may determine the degree of overload of the activity at the end of the user's activity. By obtaining lactic acid mixed in sweat through pH measurement, the electronic clock 1a can determine the degree of overload due to the user's activity. As a result, the user can easily know whether the activity was overloaded.

[0070] Also, based on the measurement result of the pH sensor 241, the CPU 11 may determine the degree of the user's dehydration state. By judging the degree of dehydration state according to the amount of lactic acid that escapes with sweat based on the measurement result of pH 241, the user can be easily informed of the risk of dehydration.

[0071] Further, the CPU 11 may change the determination frequency of the degree of dehydration state based on the environmental state around the user. The likelihood of the occurrence of the dehydration state changes according to the ambient temperature and humidity. Therefore, by changing the determination frequency of the degree of dehydration state according to these ambient conditions, it is possible to reduce the labor of determination that is likely to be wasted when the dehydration state is unlikely to occur. Conversely, by appropriately and finely making a determination when the dehydration state is likely to occur, it is possible to reduce notification omissions and user recognition omissions for the user.

[0072] Further, the electronic clock 1a includes a display unit 21 and a notification operation unit 25 as output units that output the degree of dehydration state. The CPU 11 estimates the determination accuracy of the degree of dehydration state based on the environmental state around the user, and when the determination accuracy is below the standard, the output unit may output about the decrease in the determination accuracy. When the humidity is high, for example, the ratio of lactic acid cannot be accurately obtained in real time because the sweat does not evaporate. Therefore, when it is possible that the determination result cannot be obtained accurately, the electronic clock 1a can reduce the possibility that the user recognizes with inaccurate information by also outputting to that effect.

[0073] Further, the electronic clock 1a may be able to acquire the rainfall situation of the area including the current position by the communication unit 23. When there is a possibility of rainfall at the current position, the CPU 11 may output about the decrease in the determination accuracy regarding the degree of dehydration state. Also in the case of rain, the accuracy of the determination may decrease when the user gets wet and mixes with or sweats. By notifying the user of such a situation, the electronic clock 1a can reduce the possibility that the user believes in a misjudgment and the dehydration symptoms worsen.

[0074] Further, the CPU 11 may intermittently determine the degree of dehydration state. This determination may be increased in frequency as the degree of dehydration state is higher. By frequently determining the degree of dehydration state when the situation is unfavorable or just before a dangerous situation, the electronic clock 1a can reduce the possibility of detection omission and user recognition omission.

[0075] Also, the determination method of the present embodiment executed by the CPU 11 includes the following. (1) Obtain the measurement result of the pH sensor 241 and the measurement result of the pressure sensor 242. (2) During the operation of the activity mode, combine the measurement result of the pH sensor 241 and the measurement result of the pressure sensor 242 to determine the type of activity. According to such a determination method, it is possible to increase the types that can be determined in activities using water. Therefore, the activity can be automatically switched without the user setting each time, improving the usability of the user of the electronic clock 1.

[0076] Also, by installing and executing the program 131 related to the above determination method on a computer, the usability of the user of the computer is improved.

[0077] Note that the present invention is not limited to the above embodiment, and various modifications are possible. For example,

[0078] Also, in the above, an example was given in which data of standard judgment criteria is held and the judgment criteria are corrected according to age, etc., but it is not limited to this. A plurality of data according to age, etc. may be stored in a table in advance. Alternatively, the corresponding judgment criteria may be obtained from an external server or the like according to age settings, etc. Also, not only age, but the judgment criteria may be changed according to other conditions. For example, the pH value can also change depending on the diet. Based on the historical information of the pH values measured in the past, etc., the average pH value of the user is obtained, and the judgment criteria may be corrected based on the obtained result.

[0079] Also, the magnitude of the load does not necessarily have to be determined only by the pH value. The physical strength level evaluated based on normal activities may be compared with the intensity and time of each activity to be used as a material for determining the magnitude of the load.

[0080] In addition, in the above description, an example of displaying and outputting the degree of overload and the degree of dehydration state was shown, but it is not limited to this. For example, the danger of the dehydration state may be notified by voice output from a speaker.

[0081] In addition, in the above description, the influence of rainfall and the like was considered at the time of detecting sweat. However, if the range including the pH sensor 241 is appropriately blocked from the outside during wearing, it does not necessarily have to be considered. Also, rainfall information does not have to be obtained from the outside. Water that is temporarily or intermittently transmitted due to rainfall or water work may be directly discriminable by other sensors of the measurement unit 24.

[0082] In addition, in the above description, the determination interval of the dehydration state can be appropriately changed, but it does not have to be changeable. Also, even when it is changeable, it may be changeable only in constant multiples of the shortest cycle.

[0083] In the embodiment shown in FIG. 2, the pH sensor 241 is located on the side surface of the electronic clock 1, and in another example shown in FIG. 5, the pH sensor 241 is located on the back cover side of the electronic clock 1, but it is not limited to these. Two pH sensors 241 may be located on the side surface and the back cover side, respectively. In this case, the use may be defined such that the pH sensor 241 on the side surface measures the pH of the surrounding external moisture, and the pH sensor 241 on the back cover side measures the pH of sweat.

[0084] In addition, in the above description, in order to discriminate between open swim and pool swim in the activity mode, the pH of the water was measured by the pH sensor 241, but the function of the pH sensor 241 is not limited to this. Regardless of the activity or before the start of the activity, when the arm is inserted into the water, the pH of the water may be measured to discriminate whether it is fresh water or salt water. In this case, not only the discrimination result but also the specific pH value may be displayed and output.

[0085] In addition, the sensors included in the measurement unit 24 are not limited to those exemplified above. For example, a pulse sensor or a SpO 2 sensor for measuring the user's state may be included.

[0086] Also, the processing related to the above determination may be distributed and processed by a plurality of computers or CPUs. For example, the determination processing of some activities may be executed by transmitting data to another computer. Further, the discrimination operation may be performed by a computer different from the device that displays the determination result.

[0087] Also, in the above, a wristwatch-type body-worn device worn on the wrist has been described as an example, but the present invention is not limited thereto. The body-worn device may be wearable on other parts such as the upper arm, the leg, the ankle, and the vicinity of the waist.

[0088] Also, the examples of the respective configurations and operation contents shown in the above embodiments may be arbitrarily combined and replaced as long as they do not conflict with each other.

[0089] Also, in the above description, the memory 13 composed of a non-volatile memory such as a flash memory has been described as an example of a computer-readable medium that stores the program 131 related to the determination control of the present invention, but the present invention is not limited thereto. As other computer-readable media, other non-volatile memories such as MRAM, HDDs, and portable recording media such as CD-ROMs and DVD disks can be applied. Further, a carrier wave is also applied to the present invention as a medium for providing the data of the program according to the present invention via a communication line. In addition, the specific configurations, the contents and procedures of the processing operations, etc. shown in the above embodiments can be appropriately changed without departing from the spirit of the present invention. The scope of the present invention includes the scope of the invention described in the claims and its equivalent scope.

Description of Reference Numerals

[0090] 1, 1a Electronic clock 10 Microcomputer 11 CPU 12 RAM 13 Memory 131 Program 132 pH reference data 133 pH Conversion Table 14 Oscillation Circuit 15 Frequency Division Circuit 16 Timing Circuit 17 Timer Circuit 21 Display Unit 22 Operation Reception Unit 23 Communication Unit 24, 24a Measurement Unit 241 pH Sensor 242 Pressure Sensor 243 Satellite Radio Wave Reception Processing Unit 244 Acceleration Sensor 245 Gyro Sensor 246 Geomagnetic Field Sensor 247 Illuminance Sensor 248 Temperature Sensor 249 Humidity Sensor 25 Notification Operation Unit 41 Case 42 Glass (Windshield Member) 43 Rear Cover 44 Bezel (Exterior Member) 45 Substrate 451 Connection Terminal 46 Nameplate 47 Housing 48 Flexible Printed Circuit Board 49 Guide Member 50 Packing

Claims

1. A pH sensor; A pressure sensor; a control unit that determines a type of activity by combining a measurement result of the pH sensor and a measurement result of the pressure sensor during operation in an activity mode; A body-wearable device comprising:

2. The control unit determines whether the type of the activity is open water swimming based on the measurement result of the pH sensor.

2. The body-worn device of claim 1.

3. The control unit determines whether the water is fresh water or salt water based on the measurement result of the pH sensor when the pressure sensor detects a pressure equal to or higher than a reference pressure.

2. The body-worn device of claim 1.

4. the control unit determines that the activity is a ground activity when the pressure sensor detects a pressure lower than a reference pressure.

2. The body-worn device of claim 1.

5. The pH sensor is capable of measuring a pH of a user's sweat, The control unit determines a degree of dehydration of the user based on a measurement result of the pH sensor.

2. The body-worn device of claim 1.

6. The control unit changes a frequency of determining the degree of dehydration based on an environmental condition around the user.

6. The body-worn device of claim 5.

7. An output unit that outputs the degree of the dehydration state, The control unit estimates accuracy of determining the degree of dehydration based on an environmental condition around the user, and when the accuracy is equal to or lower than a reference level, causes the output unit to output a decrease in the accuracy of the determination.

6. The body-worn device of claim 5.

8. The control unit is The degree of dehydration is determined intermittently; The higher the degree of dehydration, the higher the frequency of the judgment.

6. The body-worn device of claim 5.

9. A determination method executed by a control unit, Obtaining a measurement result of the pH sensor and a measurement result of the pressure sensor; determining a type of activity by combining the measurement result of the pH sensor and the measurement result of the pressure sensor during operation in an activity mode; Judgment method.

10. Computer, an acquisition means for acquiring a measurement result of the pH sensor and a measurement result of the pressure sensor; a determination means for determining a type of activity by combining the measurement result of the pH sensor and the measurement result of the pressure sensor during operation in an activity mode; A program that functions as a

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