Electronic devices, unlocking methods, and programs

Abstract

To improve user's convenience in biometric authentication.SOLUTION: A CPU 11 measures heart beat of a user by means of a heartbeat detection part 15 in the case where an electronic apparatus 1 is attached to the user's body, and makes a locked state by disallowing the operation in the case where the electronic apparatus 1 is removed from the user's body. When a lapse time with the electronic apparatus 1 attached again to the user's body after the locked state is less than a prescribed time, the CPU 11 measures the user's heartbeat by the heartbeat detection part 15. In the case where the degree of coincidence between the heartbeat waveform before the locked state and the heartbeat waveform after the reattachment is within a prescribed range, the locked state is released.SELECTED DRAWING: Figure 1

Description

【Technical Field】 【0001】 The present invention relates to an electronic device, an unlocking method, and a program. 【Background Art】 【0002】 In recent years, in electronic devices owned by individuals, in consideration of preventing leakage of personal information and the like, a function for performing personal authentication during use is provided so that only a specific user (owner) can use it. In particular, in a wristwatch-type electronic device that is worn on the user's wrist (wrist), in order to prevent it from being used by others when removed, it is locked (screen lock) at the time of removal, and when it is detected that it is worn again, personal authentication is performed, and the pre-registered personal information and the personal information input during use are compared and verified, and the lock is released when they match. Personal information includes, for example, a password, a gesture (a specific movement of a finger) on the screen, biometric information, and the like. 【0003】 When using a password or a gesture as personal information, an input operation is required every time personal authentication is required, which is cumbersome for the user and reduces convenience. In particular, in the above-described wristwatch-type electronic device, an authentication method that requires input of a password or a gesture is a great stress. On the other hand, personal authentication using the user's biometric information is highly convenient because it can be executed without a special operation by the user when it is detected that the user has worn it on the wrist. Known biometric information includes fingerprint, face, iris, and the like. 【0004】 For example, as the user's biometric information, a technique has been proposed in which the heartbeat waveform measured by a wearable terminal is compared with the heartbeat waveform measured by a smartphone, and the lock is released when the interval between the peaks of both heartbeat waveforms and the time at the peak match within a predetermined allowable error range (for example, Patent Document 1). 【Prior Art Documents】 【Patent Documents】 【0005】 [Patent Document 1] Japanese Patent Publication No. 2017-130011 [Overview of the Initiative] [Problems that the invention aims to solve] 【0006】 Patent Document 1 describes a method where, if the heart rate waveform measured by a wearable device matches the heart rate waveform measured by a smartphone within a predetermined tolerance range, it is determined that the user wearing the wearable device is the user of the paired smartphone. However, the biometric authentication method described in Patent Document 1 has the problem that the user of the wearable device does not necessarily have a smartphone with them when wearing it, and even if they do have a smartphone, they must launch a specific application and consciously measure their heart rate with the smartphone, which is inconvenient. 【0007】 Therefore, the present invention aims to improve user convenience during biometric authentication. [Means for solving the problem] 【0008】 The electronic device according to this invention comprises at least one processor and a heart rate detection unit for measuring the user's heart rate data, A device for detecting attachment and detachment from the user's body, An electronic device comprising, wherein the at least one processor is From the detection results of the attachment / detachment detection unit, The electronic device is attached to the user's body. It was determined that In this case, the heart rate detection unit measures the user's first heart rate data, From the detection results of the attachment / detachment detection unit, The electronic device was removed from the user's body. It was determined thatIn this case, the device locks at least a part of the functions of the electronic device, measures the elapsed time from a predetermined time after the electronic device is removed from the user's body until the electronic device is reattached to the user's body, determines whether the elapsed time is less than the predetermined time when the electronic device is reattached to the user's body, measures the user's second heart rate data using the heart rate detection unit, and if it is determined that the elapsed time is less than the predetermined time, determines whether the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range, and if the degree of agreement is within the predetermined range, unlocks the device. 【0009】 The unlocking method according to this invention is a method for unlocking an electronic device comprising at least one processor and a heart rate detection unit for measuring a user's heart rate data, wherein the at least one processor includes the steps of: measuring the user's first heart rate data with the heart rate detection unit when the electronic device is attached to the user's body; locking at least a part of the functions of the electronic device when the electronic device is removed from the user's body; measuring the elapsed time from a predetermined timing after the electronic device is removed from the user's body until the electronic device is reattached to the user's body; determining whether the elapsed time is less than a predetermined time and measuring the user's second heart rate data with the heart rate detection unit when the electronic device is reattached to the user's body; determining whether the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range if it is determined that the elapsed time is less than a predetermined time; and unlocking the device if the degree of agreement is within a predetermined range. 【0010】 The program according to this invention is a program executed on an electronic device and is characterized by realizing: a function to measure the user's first heart rate data using a heart rate detection unit when the electronic device is attached to the user's body; a function to lock at least a part of the functions of the electronic device when the electronic device is removed from the user's body; a function to measure the elapsed time from a predetermined timing after the electronic device is removed from the user's body until the electronic device is reattached to the user's body; a function to determine whether the elapsed time is less than a predetermined time and measure the user's second heart rate data using the heart rate detection unit when the electronic device is reattached to the user's body; a function to determine whether the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range if it is determined that the elapsed time is less than a predetermined time; and a function to release the lock if the degree of agreement is within a predetermined range. [Effects of the Invention] 【0011】 This invention makes it possible to improve user convenience during biometric authentication. [Brief explanation of the drawing] 【0012】 [Figure 1] This is a block diagram showing the configuration of the electronic device 1 of this embodiment. [Figure 2] This is a flowchart illustrating the operation of the electronic device 1 in this embodiment. [Figure 3] This is a flowchart illustrating the operation of the electronic device 1 in this embodiment. [Figure 4] This is a schematic diagram showing an example of a heart rate measurement waveform by the electronic device 1 of this embodiment. [Figure 5] This is a schematic diagram showing an example of screen transitions for the electronic device 1 of this embodiment. [Modes for carrying out the invention] 【0013】 A. Configuration of the Embodiment The best mode for carrying out the present invention will be described below with reference to the drawings. However, the embodiments described below are subject to various technically preferred limitations for carrying out the present invention, but the scope of the invention is not limited to the embodiments and illustrated examples below. The electronic device according to this embodiment is a so-called wearable device that is worn on the body, such as on the wrist, arm, or chest. 【0014】 Figure 1 is a block diagram showing the configuration of the electronic device 1 of this embodiment. The electronic device 1 comprises a CPU 11, a memory 12, a touch panel display unit 13, an operation unit 14, a heart rate detection unit 15, and a device attachment / detachment detection unit 16. The CPU 11 is a CPU that controls various operations of the electronic device 1 according to a program stored in the memory 12 (ROM). The CPU 11 may be a CPU, ASIC, FPGA, etc. Also, the CPU 11 may be composed of two or more CPUs. The CPU 11 operates as a determination unit that determines input of a specific operation key on the operation unit 14 or touch operation (such as a finger touch) on the touch panel display unit 13. The CPU 11 also operates as a control unit that changes the processing to be executed in response to the operation of a specific operation key or touch operation. 【0015】 In particular, in this embodiment, the CPU 11 performs tasks such as measuring and recording the user's heart rate, attaching and detaching the electronic device 1, locking / unlocking the screen, operating a timer to measure the time the electronic device 1 is detached, and personal authentication based on the heart rate waveform. 【0016】 The memory 12 stores a system program (not shown) that controls the overall operation of the electronic device 1, a program for measuring the user's heartbeat waveform by the heartbeat detection unit 15, a program for personal authentication based on the measured heartbeat waveform, and the like. Also, the memory 12 is configured to store the user's heartbeat waveform immediately before the wristwatch-type electronic device 1 is removed for personal authentication. The touch panel display unit 13 has a structure in which a touch panel that detects the position touched by the user's finger or the like and a display unit are integrated, and is configured by overlaying a touch panel on the display unit. The display unit is an m×n dot display such as a liquid crystal display, and displays various information. 【0017】 The operation unit 14 is various keys for the user to operate the electronic device 1. When an operation using the operation unit 14 is received, an input signal corresponding to the operation is transmitted to the CPU 11. The heartbeat detection unit 15 is composed of a light-emitting element such as a light-emitting diode and a light-receiving element such as a phototransistor or a photodiode. The light output from the light-emitting element is received by the light-receiving element, and the heartbeat waveform is detected based on the change in the intensity of the input light. Under the control of the CPU 11, the heartbeat detection unit 15 measures the user's heartbeat waveform at a predetermined time interval while the user is wearing the electronic device 1 on the arm. The light-emitting element and the light-receiving element are arranged on the back surface that adheres closely to the arm of the user wearing the electronic device 1. The attachment / detachment detection unit 16 is composed of an optical sensor or the like for detecting the attachment / detachment state of the electronic device from the arm, and this can also be used in place of the heartbeat detection unit 15. 【0018】 B. Operations of the Embodiment FIG. 2 and FIG. 3 are flowcharts for explaining the operation of the electronic device 1 according to the present embodiment. In the electronic device 1 worn by the user, the CPU 11 acquires a heartbeat waveform by the heartbeat detection unit 15 (step S10), and records the acquired heartbeat waveform in the memory 12 (step S12). The heartbeat waveform at this time may be one to several beats. Next, the CPU 11 detects the attachment / detachment of the wristwatch-type electronic device 1 by the attachment / detachment detection unit 16 (step S14), and determines whether it is worn on the wrist (step S16). If the electronic device 1 has not been removed, that is, if it is worn on the wrist (YES in step S16), the process returns to step S10, and the measurement and recording of the heartbeat waveform by the heartbeat detection unit 15 are repeated. If necessary, the estimated heart rate of the user based on the measured and recorded heartbeat waveforms is displayed. 【0019】 On the other hand, when the user removes the electronic device 1 for some reason (such as washing hands, taking a shower, etc.), the CPU 11 determines that the electronic device 1 has been removed from the detection result of the attachment / detachment detection unit 16 (NO in step S16), locks the screen (step S18), and stops the heartbeat measurement by the heartbeat detection unit 15 (step S20). Note that the heartbeat waveform data for several seconds immediately before the stop is stored as it is. In the locked state of the screen, a key icon indicating the locked state is displayed on the touch panel display unit 13, and touch operations for executing some functions are disabled. More specifically, in the locked state, it is possible to perform minimal operations such as moving to the password input screen for unlocking, brightening the darkened screen, or adjusting the volume by button operation, but it is not possible to move to the home screen and execute the installed applications or move to the setting screen. 【0020】 Next, the CPU 11 starts timing using a timer (step S22), detects the attachment / detachment of the wristwatch-type electronic device 1 using the attachment / detachment detection unit 16 (step S24), and determines whether or not it has been put back on the wrist (step S26). If the electronic device 1 is not attached (NO in step S26), the process returns to step S24, and steps S24 and S26 are repeated until the electronic device 1 is put back on. During this time, timing continues using the timer. Note that the timer may start measuring elapsed time not only after a predetermined time has elapsed since the device was locked (step S22), but also when the electronic device 1 is removed (immediately after step S16) or when the device is locked (immediately after step S18). 【0021】 On the other hand, when the user reattaches the electronic device 1, the CPU 11 determines from the detection result of the attachment / detachment detection unit 16 that the electronic device 1 has been reattached (YES in step S26), stops the timer (step S28), and determines whether a certain amount of time has elapsed since the electronic device 1 was removed (step S30). Here, the certain amount of time is, for example, several minutes to about 10 minutes, and can be set by the user in minutes, or it may be determined appropriately based on the history so far. 【0022】 If a certain amount of time has not elapsed since the electronic device 1 was removed (NO in step S30), the CPU 11 starts (resumes) heart rate measurement by the heart rate detection unit 15 (step S32) and acquires a heart rate waveform by the heart rate detection unit 15 (step S34). The CPU 11 compares the heart rate waveform immediately before the electronic device 1 was removed (first heart rate data) with the heart rate waveform after reattachment (second heart rate data) (step S36) and determines whether the degree of agreement between the two heart rate waveforms is within a predetermined range (step S38). Note that the timing of starting (resumeing) heart rate measurement (step S32) is not limited to after step S30, but may be done after step S26. 【0023】 Here, the heart rate waveform according to this embodiment will be described. Figure 4 is a schematic diagram showing an example of a heart rate measurement waveform by the electronic device 1 of this embodiment. Figure 4 shows an example of a heart rate waveform detected by photoplethysmography (PPG), which is often used for pulse detection by small devices such as smartwatches (the electronic device 1). 【0024】 In Figure 4, the upward arrow 20 indicates the sampling timing. At this constant sampling timing, the amount of light received by the PPG's photodetector is measured. In the illustrated example, one period T1 is defined as the period from the lowest sampling value to the next lowest sampling value. When the user removes the electronic device 1, the value of one period T1 of the heart rate waveform immediately before removal is stored as the heart rate waveform to be compared. 【0025】 Similarly, when the device is reattached, a heart rate waveform is sampled, and the value of one cycle T1 of this heart rate waveform (first heart rate data) is compared with the value of one cycle T1 of the heart rate waveform being compared (second heart rate data) to determine whether the person reattaching the device is the same user who was wearing it before removal. If both values ​​(first heart rate data and second heart rate data) are within a predetermined tolerance range, it is determined that they match, and the person reattaching the device is determined to be the same user who was wearing it before removal. If the time the device is removed is short (within a certain period of time), the change in the heart rate waveform is small, and personal authentication can be performed by comparing the heart rate waveforms in one cycle T1 before and after attachment. Furthermore, in this embodiment, since the method involves comparing heart rate waveforms, that is, comparing the shape of the approximate envelope 21, biometric authentication can be performed with sufficient accuracy even if the sampling period is somewhat coarse. 【0026】 Note that while the above period T1 is defined as the period from the lowest value to the next lowest value, it is also possible to use only the start timing of a period as the minimum value and compare the period duration as fixed, or to record and compare the end of a period as a timing that is not linked to the waveform, as in period T2. 【0027】 Returning to the explanation in Figure 3, if it is determined that the heart rate waveform immediately before removing the electronic device 1 matches the heart rate waveform after reattaching it (YES in step S38), the CPU 11 determines that the person who reattached the device is the same legitimate user and automatically unlocks the screen (step S40). Then, the process returns to step S10 and the above-described process is repeated. 【0028】 On the other hand, if a certain amount of time has elapsed since the user reattached the electronic device 1 (YES in step S20), there is a possibility that the heart rate waveform has changed significantly. Therefore, the system proceeds to the normal unlocking process (passcode entry, etc.) without performing personal authentication by comparing the heart rate waveform before and after reattachment as described above (step S42). Also, even if less than a certain amount of time has elapsed, if the heart rate waveform does not match before and after reattachment (NO in step S38), the system naturally cannot authenticate the user, and proceeds to the normal unlocking process (passcode entry, etc.) (step S42). 【0029】 The CPU 11 then determines whether the person who reinserted the device through the normal unlocking process is the same legitimate user, i.e., whether personal authentication is successful (step S44). If personal authentication is successful (YES in step S44), the screen lock is automatically unlocked (step S46). After that, the process returns to step S10 and the above process is repeated. 【0030】 On the other hand, if personal authentication is not successful (NO in step S44), the person who reattached the device is not the same legitimate user, so the process returns to step S18 and the above-described process is repeated. In other words, in this case, no one other than the user can operate the electronic device 1. 【0031】 Figure 5 is a schematic diagram showing an example of screen transitions for the electronic device 1 of this embodiment. When the user wears the electronic device 1 on their arm, the touch panel display unit 13 displays a normal screen 13a, indicating the normal state. The normal screen 13a displays the day of the week (WED), date (5-15), time (12:58 50), step count (123step), etc. When the user removes the electronic device 1 from their arm (step SS1), the touch panel display unit 13 displays a lock screen 13b, indicating the locked state. The lock screen 13b displays a key icon 30, indicating the locked state. In the locked state, minimal operations such as touching the screen to move to the passcode input screen 13d (described later), brightening the dimmed screen, and adjusting the volume using buttons can be performed, but it is not possible to move to the home screen and operate downloaded applications. 【0032】 Next, if the electronic device 1 is put back on the arm before a certain period of time has elapsed (step SS2), the touch panel display unit 13 displays a determination screen 13c indicating that it is measuring and comparing heart rate waveforms (first heart rate data and second heart rate data). The determination screen 13c displays a heart icon 31 indicating that it is measuring the heart rate waveform (second heart rate data) and comparing the heart rate waveforms before and after putting it on (making a determination to unlock it). Then, when the heart rate waveforms before and after putting it on match and the lock state is automatically released (step SS3), the touch panel display unit 13 displays a normal screen 13e indicating that it is in the normal state. The normal screen 13e displays the day of the week (WED), date (5-15), time (12:59 40), and step count (123step), similar to the normal screen 13a. 【0033】 On the other hand, if the device is worn on the arm after a certain period of time has elapsed, or if the keys or other operations are performed without wearing the device on the arm (step SS4), or if the electronic device 1 is reattached before a certain period of time has elapsed but the heart rate waveforms before and after attachment do not match (step SS5), the touch panel display unit 13 displays a passcode input screen 13d for entering a passcode. The passcode input screen 13d displays a key icon 30 indicating that the device is locked, along with a sequence of numbers 32 for entering a passcode. Subsequently, if the entered passcode matches a pre-registered passcode and the lock state is manually released (step SS6), the touch panel display unit 13 displays a normal screen 13e indicating that the device is in a normal state. The normal screen 13e displays the day of the week (WED), date (5-15), time (12:59 40), and step count (123step), similar to the normal screen 13a. In this case, since the lock state has been released, the display of the touch panel display unit 13 may be controlled to transition to a home screen or the like, which displays a list of application icons stored in the memory 12 of the electronic device 1, instead of the normal screen 13e. 【0034】 According to the embodiment described above, when the electronic device 1 is attached to the user's body, the CPU 11 measures the user's first heart rate data using the heart rate detection unit 15, locks the electronic device 1 when it is removed from the user's body, and determines whether the elapsed time from the moment the electronic device 1 is removed from the user's body until it is reattached to the user's body is less than a predetermined time. The CPU 11 also measures the user's second heart rate data using the heart rate detection unit 15, and if it is determined that the elapsed time is less than a predetermined time, it unlocks the device if the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range. As a result, for example, even if the electronic device 1 is removed from the user's body for a short time to wash hands, the lock can be automatically released without requiring any special operation from the user, thereby improving user convenience during biometric authentication. 【0035】 Furthermore, in cases where the device is unlocked by accepting a passcode, the user would enter the passcode after the electronic device 1 is attached to the user's body. However, according to this embodiment, the heart rate waveform can be acquired and the device unlocked while the user is trying to put the electronic device 1 back on (while the watch band is wrapped around the wrist), so the device can be unlocked in a shorter time than when the device is unlocked by accepting a passcode. 【0036】 According to the embodiment described above, since the second heart rate data is measured after it is determined that the elapsed time is less than a predetermined time, by measuring the heart rate after reattachment only when personal authentication using heart rate data can be performed more accurately, unnecessary heart rate measurements can be eliminated, enabling smoother personal authentication and improving user convenience. 【0037】 According to the embodiment described above, the predetermined timing for starting to measure elapsed time is set to the timing when at least a part of the function is locked. This allows for more accurate measurement of the elapsed time required for more accurate personal authentication using heart rate data, enabling smoother personal authentication and improving user convenience. 【0038】 According to the embodiment described above, the first heart rate data measured for a predetermined period before the electronic device 1 is removed from the user's body is stored in the memory 12, and the first heart rate data is read from the memory 12 when comparing it with the second heart rate data, thereby improving user convenience during biometric authentication. 【0039】 According to the embodiment described above, the heart rate detection unit 15 detects when the electronic device 1 is attached to or removed from the user's body, thereby improving user convenience and simplifying the configuration of the electronic device 1. 【0040】 According to the embodiment described above, the attachment / detachment detection unit 16, which consists of an optical sensor, is used to detect the attachment and detachment of the electronic device to the user's body. This ensures reliable detection of the attachment and detachment of the electronic device, thereby improving user convenience. 【0041】 According to the embodiment described above, when determining whether the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range, a heart icon 31 indicating that a lock release decision is being made is displayed on the touch panel display unit 13, thereby informing the user that the heart rate waveform is being compared. 【0042】 According to the embodiment described above, when the CPU 11 determines that the elapsed time is longer than a predetermined time, it displays a passcode input screen 13d on the touch panel display unit 13 for executing an authentication process by entering a passcode. If the passcode entered on the passcode input screen 13d matches a pre-registered passcode, the lock is released. Therefore, even if the likelihood of accurate biometric authentication becoming impossible increases due to the passage of time, the authentication process can be executed smoothly, thereby improving user convenience. 【0043】 According to the embodiment described above, the heart rate detection unit 15 samples the user's heart rate at a predetermined sampling period, and the CPU 11 determines whether the degree of agreement between the heart rate waveforms before and after wearing the device is within an acceptable range, with the period from the lowest sampling value to the next lowest sampling value being considered as one period. This improves user convenience and enables biometric authentication with sufficient accuracy even if the sampling period is somewhat coarse. In other words, when unlocking with a passcode, the user enters the passcode after putting on the electronic device 1, but in the present invention, the heart rate waveform of one period can be acquired and the device unlocked while the user is putting on the electronic device again (while wrapping the watch band around their arm), so the device can be unlocked in a shorter time than with normal passcode unlocking. 【0044】 According to the embodiment described above, the heart rate detection unit 15 samples the user's heart rate at a predetermined sampling period, and the CPU 11 determines whether the degree of agreement between the heart rate waveforms before and after attachment is within an acceptable range, with the period from the lowest sampled value to the sampled value after a predetermined time elapsed being one cycle. This improves user convenience and enables biometric authentication with sufficient accuracy even if the sampling period is somewhat coarse. 【0045】 In the embodiment described above, unlocking was performed using heart rate waveforms, but personal authentication may also be performed using heart rate data or other heart rate-related data. Furthermore, authentication using both heart rate and heart rate waveform data can enable more accurate authentication. 【0046】 Although several embodiments of this invention have been described above, this invention is not limited to these, but includes the invention described in the claims and its equivalents. The invention described in the claims of this application is listed below. 【0047】 (Note 1) The invention described in Appendix 1 is an electronic device comprising at least one processor and a heart rate detection unit for measuring a user's heart rate data, wherein the at least one processor measures the user's first heart rate data using the heart rate detection unit when the electronic device is attached to the user's body, locks at least a part of the functions of the electronic device when the electronic device is removed from the user's body, measures the elapsed time from a predetermined timing after the electronic device is removed from the user's body until the electronic device is reattached to the user's body, determines whether the elapsed time is less than the predetermined time when the electronic device is reattached to the user's body, measures the user's second heart rate data using the heart rate detection unit, and if it is determined that the elapsed time is less than the predetermined time, determines whether the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range, and if the degree of agreement is within the predetermined range, unlocks the device. 【0048】 (Note 2) The invention described in Appendix 2 is the electronic device described in Appendix 1, characterized in that at least one processor measures the second heart rate data after it is determined that the elapsed time is less than a predetermined time. 【0049】 (Note 3) The invention described in Appendix 3 is the electronic device described in Appendix 1, characterized in that the predetermined timing is the timing at which at least a part of the function is locked. 【0050】 (Note 4) The invention described in Appendix 4 is an electronic device as described in Appendix 1, characterized in that the electronic device stores first heart rate data for a predetermined period measured before the electronic device is removed from the user's body in a storage unit, and when comparing it with the second heart rate data, it retrieves the first heart rate data from the storage unit. 【0051】 (Note 5) The invention described in Appendix 5 is the electronic device described in Appendix 1, characterized in that the heart rate detection unit detects the attachment and detachment of the electronic device to the user's body. 【0052】 (Note 6) The invention described in Appendix 6 is the electronic device described in Appendix 1, further comprising an optical sensor, wherein the at least one processor detects the attachment or detachment of the electronic device to the user's body by the optical sensor. 【0053】 (Note 7) The invention described in Appendix 7 is an electronic device according to Appendix 1, further comprising a display unit, wherein at least one processor causes the display unit to display an icon indicating that an unlocking determination is being made when it has determined whether the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range. 【0054】 (Note 8) The invention described in Appendix 8 is an electronic device as described in Appendix 7, characterized in that, when the elapsed time is determined to be longer than a predetermined time, the at least one processor displays a passcode input screen on the display unit for performing authentication processing by passcode input, and when the passcode entered on the passcode input screen matches a pre-registered passcode, the lock is released. 【0055】 (Note 9) The invention described in Appendix 9 is an electronic device as described in Appendix 1, characterized in that the heart rate detection unit samples the user's heart rate at a predetermined sampling period, and at least one processor determines whether the degree of agreement between the first heart rate data and the second heart rate data falls within a predetermined range, with one period defined as the range from the lowest sampling value to the next lowest sampling value among the sampling values ​​sampled by the heart rate detection unit. 【0056】 (Note 10) The invention described in Appendix 10 is an electronic device as described in Appendix 1, characterized in that the heart rate detection unit samples the user's heart rate at a predetermined sampling period, and at least one processor determines whether the degree of agreement between the first heart rate data and the second heart rate data falls within a predetermined range, with one period defined as the range from the lowest sampling value among the sampling values ​​sampled by the heart rate detection unit to the sampling value after a predetermined time has elapsed. 【0057】 (Note 11) The invention described in Appendix 11 is a method for unlocking an electronic device, comprising at least one processor and a heart rate detection unit for measuring a user's heart rate data, wherein the at least one processor includes the steps of: measuring the user's first heart rate data with the heart rate detection unit when the electronic device is attached to the user's body; locking at least a part of the functions of the electronic device when the electronic device is removed from the user's body; measuring the elapsed time from a predetermined timing after the electronic device is removed from the user's body until the electronic device is reattached to the user's body; determining whether the elapsed time is less than a predetermined time and measuring the user's second heart rate data with the heart rate detection unit when the electronic device is reattached to the user's body; determining whether the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range if it is determined that the elapsed time is less than a predetermined time; and unlocking the device if the degree of agreement is within a predetermined range. 【0058】 (Note 12) The invention described in Appendix 12 is a program executed on an electronic device, characterized in that it implements: a function to measure the user's first heart rate data using a heart rate detection unit when the electronic device is attached to the user's body; a function to lock at least a part of the functions of the electronic device when the electronic device is removed from the user's body; a function to measure the elapsed time from a predetermined timing after the electronic device is removed from the user's body until the electronic device is reattached to the user's body; a function to determine whether the elapsed time is less than a predetermined time and measure the user's second heart rate data using the heart rate detection unit when the electronic device is reattached to the user's body; a function to determine whether the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range if it is determined that the elapsed time is less than a predetermined time; and a function to release the lock if the degree of agreement is within a predetermined range. [Explanation of symbols] 【0059】 1...Electronic device, 11...CPU, 12...Memory, 13...Touch panel display, 13a, 13e...Normal screen, 13b...Lock screen, 13c...Judgment screen, 13d...Passcode input screen, 14...Operation panel, 15...Heart rate detection panel, 16...Attachment / detachment detection panel, 30...Key icon, 31...Heart icon, 32...Number string

Claims

[Claim 1] An electronic device comprising at least one processor, a heart rate detection unit for measuring the user's heart rate data, and an attachment / detachment detection unit for detecting attachment / detachment to the user's body, The aforementioned at least one processor is If the attachment / detachment detection unit determines from the detection result that the electronic device is attached to the user's body, the heart rate detection unit measures the user's first heart rate data. If the detection result of the attachment / detachment detection unit determines that the electronic device has been removed from the user's body, then at least a part of the functions of the electronic device is locked. The elapsed time from a predetermined time after the electronic device is removed from the user's body until the electronic device is reattached to the user's body is measured. When the electronic device is reattached to the user's body, it is determined whether the elapsed time is less than a predetermined time, and the heart rate detection unit measures the user's second heart rate data. If it is determined that the elapsed time is less than a predetermined time, it is determined whether the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range. If the degree of agreement falls within a predetermined range, the lock is released. An electronic device characterized by the following features. [Claim 2] The aforementioned at least one processor is The electronic device according to claim 1, characterized in that it measures the second heart rate data after it is determined that the elapsed time is less than a predetermined time. [Claim 3] The electronic device according to claim 1, characterized in that the predetermined timing is the timing at which at least a part of the function is locked. [Claim 4] The electronic device according to claim 1, characterized in that it stores first heart rate data for a predetermined period measured before the electronic device is removed from the user's body in a storage unit, and retrieves the first heart rate data from the storage unit when comparing it with second heart rate data. [Claim 5] The electronic device according to claim 1, characterized in that the attachment / detachment detection unit is the heart rate detection unit. [Claim 6] The electronic device according to claim 1, characterized in that the attachment / detachment detection unit is an optical sensor. [Claim 7] It also includes a display unit, The aforementioned at least one processor is The electronic device according to claim 1, characterized in that when it is determined whether the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range, an icon indicating that a lock release determination is being made is displayed on the display unit. [Claim 8] The aforementioned at least one processor is If it is determined that the elapsed time is equal to or greater than a predetermined time, the display unit will display a passcode input screen for performing authentication processing by entering a passcode. The electronic device according to claim 7, characterized in that the lock is released when the passcode entered on the passcode input screen matches a pre-registered passcode. [Claim 9] The aforementioned heart rate detection unit is The user's heart rate waveform is sampled at a predetermined sampling period. The aforementioned at least one processor is The electronic device according to claim 1, characterized in that it determines whether the degree of agreement between the first heart rate data and the second heart rate data falls within a predetermined range, with one period defined as the range from the lowest sampling value to the next lowest sampling value among the sampling values ​​sampled by the heart rate detection unit. [Claim 10] The aforementioned heart rate detection unit is The user's heart rate waveform is sampled at a predetermined sampling period. The aforementioned at least one processor is The heart rate detection unit determines whether the degree of agreement between the first heart rate data and the second heart rate data falls within a predetermined range, with one period defined as the range from the lowest sampling value to the sampling value after a predetermined time has elapsed. The electronic device according to feature 1. [Claim 11] A method for unlocking an electronic device comprising at least one processor, a heart rate detection unit for measuring the user's heart rate data, and an attachment / detachment detection unit for detecting attachment / detachment to the user's body, The aforementioned at least one processor is If, based on the detection result of the attachment / detachment detection unit, it is determined that the electronic device is attached to the user's body, the heart rate detection unit measures the user's first heart rate data. If, based on the detection result of the attachment / detachment detection unit, it is determined that the electronic device has been removed from the user's body, the step of locking at least a part of the functions of the electronic device, A step of measuring the elapsed time from a predetermined time after the electronic device is removed from the user's body until the electronic device is reattached to the user's body, When the electronic device is reattached to the user's body, the steps include determining whether the elapsed time is less than a predetermined time and measuring the user's second heart rate data using the heart rate detection unit, If it is determined that the elapsed time is less than a predetermined time, the step is to determine whether the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range. If the degree of agreement falls within a predetermined range, the steps include releasing the lock, A method for unlocking a lock, characterized by performing the following actions. [Claim 12] A program executed by an electronic device comprising a heart rate detection unit for measuring the user's heart rate data and an attachment / detachment detection unit for detecting attachment / detachment to the user's body, Based on the detection results of the attachment / detachment detection unit, if it is determined that the electronic device is attached to the user's body, the heart rate detection unit measures the user's first heart rate data. Based on the detection results of the attachment / detachment detection unit, if it is determined that the electronic device has been removed from the user's body, the system has a function to lock at least some of the functions of the electronic device. A function to measure the elapsed time from a predetermined time after the electronic device is removed from the user's body until the electronic device is reattached to the user's body, When the electronic device is reattached to the user's body, it has a function to determine whether the elapsed time is less than a predetermined time, and to measure the user's second heart rate data using the heart rate detection unit. If it is determined that the elapsed time is less than a predetermined time, the function determines whether the degree of agreement between the first heart rate data and the second heart rate data is within a predetermined range. If the degree of agreement falls within a predetermined range, the lock is released. To achieve A program characterized by the following features.

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