JP7584994B2 - Mobile terminal, pulse wave acquiring method, and pulse wave acquiring program - Google Patents

Description

The present invention relates to a mobile terminal, a pulse wave acquisition method, and a pulse wave acquisition program.

Pulse waves can be used to determine various health-related indicators, such as vascular age and stress. In recent years, mobile devices such as smartphones equipped with photoelectric pulse wave sensors have come into use. With such mobile devices, pulse waves can be obtained by pressing a living body such as a finger against the photoelectric pulse wave sensor (see Patent Documents 1 and 2).

Special table 2018-526075 publication JP 2016-026518 A

In mobile terminals such as smartphones, a display is provided on the front, and therefore the photoelectric sensor used to acquire the pulse wave is often provided on the back. When acquiring a pulse wave from a living body such as a fingertip, for example, the pulse wave is acquired by pressing the living body such as the fingertip against the photoelectric sensor with a pressure suitable for pulse wave measurement. In order to determine vascular age, stress, etc. based on the pulse wave, multiple pulse waves must be acquired, and the measurement time is 10 seconds or more. It is difficult for a user to continue pressing the living body against the photoelectric sensor provided on the back of the mobile terminal while maintaining a pressure suitable for acquiring a pulse wave during such a measurement time.

One aspect of the disclosed technology is to provide a mobile terminal, a pulse wave acquisition method, and a pulse wave acquisition program that can acquire pulse waves with higher accuracy using a photoelectric sensor installed on the back.

One aspect of the disclosed technology is exemplified by a mobile terminal as follows. This mobile terminal includes a photoelectric sensor provided on the back of a plate-shaped housing and acquiring a pulse wave from a living body in contact with the housing, a pressure sensor provided on the front of the housing and detecting pressure applied to a position overlapping with the photoelectric sensor when viewed in the normal direction of the front, a tilt sensor that detects the tilt of the housing in the front-to-rear direction, and a control unit that causes the photoelectric sensor to acquire a pulse wave when the pressure detected by the pressure sensor and the tilt detected by the tilt sensor are within a preset tolerance range.

The disclosed technology allows pulse waves to be acquired with greater accuracy using a photoelectric sensor mounted on the back.

FIG. 1 is a diagram illustrating an example of the appearance of a smartphone according to an embodiment. FIG. 2 is a diagram illustrating an example of a hardware configuration of the smartphone according to the embodiment. FIG. 3 is a diagram illustrating an example of a processing block of the smartphone according to the embodiment. FIG. 4 is a diagram showing an example of a measurement screen in the embodiment. FIG. 5 is a first diagram illustrating an example of a usage mode of the smartphone according to the embodiment. FIG. 6 is a second diagram illustrating an example of a usage mode of the smartphone according to the embodiment. FIG. 7 is a third diagram illustrating an example of a usage mode of the smartphone according to the embodiment. FIG. 8 is a fourth diagram showing an example of a usage mode of the smartphone according to the embodiment. FIG. 9 is a diagram illustrating an example of a process flow of pulse wave measurement using the smartphone according to the embodiment. FIG. 10 is a diagram illustrating an example of a processing block of a smartphone according to a modified example. FIG. 11 is a diagram illustrating an example of a processing flow of a smartphone according to a modified example.

<Embodiment>
The configurations of the embodiments shown below are examples, and the disclosed technology is not limited to the configurations of the embodiments. The mobile terminal according to the embodiment has, for example, the following configuration. The mobile terminal according to the embodiment has a photoelectric sensor provided on the back surface of a plate-shaped housing and acquiring a pulse wave from a living body in contact with the housing, a pressure sensor provided on the front surface of the housing and detecting a pressure applied to a position overlapping with the photoelectric sensor when viewed in the normal direction of the front surface, a tilt sensor detecting a tilt in the front-rear direction of the housing, and a control unit that causes the photoelectric sensor to acquire a pulse wave when the pressure detected by the pressure sensor and the tilt detected by the tilt sensor are within a preset allowable range.

The weight of the mobile device affects the pressure detected by the pressure sensor depending on the tilt of the mobile device in the forward/backward direction. Therefore, when the mobile device is tilted forward/backward, even if the pressure sensor indicates a pressure suitable for acquiring a pulse wave, the pressure applied to the photoelectric sensor is not necessarily suitable for acquiring a pulse wave. This mobile device uses a tilt sensor that detects the forward/backward tilt of the casing, and by having the photoelectric sensor acquire a pulse wave when the pressure detected by the pressure sensor and the tilt detected by the tilt sensor are within a preset allowable range, it is possible to acquire a pulse wave with higher accuracy using the photoelectric sensor installed on the back.

An embodiment in which the above-mentioned mobile terminal is applied to a smartphone will be described with reference to the drawings. FIG. 1 illustrates an example of the appearance of a smartphone according to the embodiment as viewed from one side (front side appearance) and the other side (rear side appearance). In FIG. 1, the front side and rear side of the smartphone 100 are swapped and illustrated by the arrow. The smartphone 100 has a plate-shaped housing 110. Although not illustrated in FIG. 1, the distance (thickness) between the front and rear sides of the housing 110 is short compared to the outer dimensions of the front or rear. It is assumed that the upper side of the paper in FIG. 1 is the upper side of the housing 110, and the lower side of the paper is the lower side of the housing 110. Hereinafter, in this specification, the vertical direction of the housing 110 is also referred to as the Y direction, and the width direction of the housing 110 perpendicular to the Y direction is also referred to as the X direction. The thickness direction of the housing 110 is also referred to as the Z direction.

1 , a display 113 is provided on the front surface of the housing 110. A touch panel 114 is provided so as to overlap the display 113. A pressure detection panel 115 is provided, for example, between the display 113 and the touch panel 114. The pressure detection panel 115 is disposed in a position overlapping a light emitting diode (LED) photodetector 120 when viewed from the front. A speaker 111 is provided in a central position on the upper side of the display 113. A microphone 112 is provided in a central position on the lower side of the display 113. The front surface corresponds to a first surface on the outer surface of the housing 110.

The LED photodetector 120 is provided on the back surface of the housing 110. The position at which the LED photodetector 120 is provided is, for example, a position where, when the housing 110 is held in one hand and the fingers of the holding hand are extended toward the LED photodetector 120, the fingertip of the finger reaches the LED photodetector 120 from diagonally below the LED photodetector 120.

FIG. 2 is a diagram showing an example of the hardware configuration of a smartphone according to an embodiment. The smartphone 100 includes a Central Processing Unit (CPU) 101, a main memory unit 102, an auxiliary memory unit 103, a communication unit 104, a speaker 111, a microphone 112, a display 113, a touch panel 114, and an LED photodetector 120. The CPU 101, the main memory unit 102, the auxiliary memory unit 103, the communication unit 104, the speaker 111, the microphone 112, the display 113, the touch panel 114, and the LED photodetector 120 are interconnected by a connection bus.

The CPU 101 is also called a microprocessor unit (MPU) or a processor. The CPU 101 is not limited to a single processor, and may have a multi-processor configuration. A single CPU 101 connected to a single socket may have a multi-core configuration. At least a part of the processing performed by the CPU 101 may be performed by a processor other than the CPU 101, for example, a dedicated processor such as a digital signal processor (DSP), a graphics processing unit (GPU), a numerical calculation processor, a vector processor, or an image processing processor. At least a part of the processing performed by the CPU 101 may be performed by an integrated circuit (IC) or other digital circuit. At least a part of the CPU 101 may include an analog circuit. The integrated circuit includes a large scale integrated circuit (LSI), an application specific integrated circuit (ASIC), and a programmable logic device (PLD). The PLD includes, for example, a field-programmable gate array (FPGA). The CPU 101 may be a combination of a processor and an integrated circuit. The combination is called, for example, a microcontroller unit (MCU), a system-on-a-chip (SoC), a system LSI, a chipset, etc. In the smartphone 100, the CPU 101 expands a program stored in the auxiliary storage unit 103 into a working area of the main storage unit 102, and controls peripheral devices through the execution of the program. This allows the smartphone 100 to execute processing that matches a predetermined purpose. The main memory unit 102 and the auxiliary memory unit 103 are recording media that can be read by the smartphone 100.

The main memory unit 102 is exemplified as a memory unit that is directly accessed by the CPU 101. The main memory unit 102 includes a Random Access Memory (RAM) and a Read Only Memory (ROM).

The auxiliary storage unit 103 stores various programs and various data in a readable and writable recording medium. The auxiliary storage unit 103 is also called an external storage device. An operating system (OS), various programs, various tables, etc. are stored in the auxiliary storage unit 103. The OS includes a communication interface program that transfers data with external devices, etc. connected via the communication unit 104. The external devices, etc. include, for example, other information processing devices and external storage devices connected via a computer network, etc. The auxiliary storage unit 103 may be, for example, part of a cloud system, which is a group of computers on a network.

The auxiliary memory unit 103 is, for example, an erasable programmable ROM (EPROM), a solid state drive (SSD), a hard disk drive (HDD), etc.

The communication unit 104 is an interface with a computer network, such as a mobile phone line or a local area network (LAN). The communication unit 104 communicates with an external device via the computer network.

The speaker 111 is an audio output device. The speaker 111 outputs sounds such as the voice of the other party during a call using the smartphone 100. The microphone 112 accepts input of the user's voice during a call using the smartphone 100.

The display 113 displays data processed by the CPU 101 and data stored in the main memory unit 102. The display 113 is, for example, a Cathode Ray Tube (CRT) display, a Liquid Crystal Display (LCD), a Plasma Display Panel (PDP), an Electroluminescence (EL) panel, or an organic EL panel. The display 113 is an example of a "display unit."

The touch panel 114 detects the touch position when the user touches the smartphone 100 with a finger or the like. By including the touch panel 114, the smartphone 100 can provide the user with an intuitive operating environment.

The pressure detection panel 115 detects the pressure with which a finger presses the display 113. Instead of the pressure detection panel 115, the smartphone 100 may detect the pressure with which a finger presses using the touch panel 114.

The tilt sensor 116 detects the tilt of the smartphone 100. The tilt sensor 116 detects, for example, the direction of gravitational acceleration, and detects the tilt of the smartphone 100 based on the detected direction of gravitational acceleration. For example, an acceleration sensor or a gyro sensor can be used as the tilt sensor 116.

The LED photodetector 120 is a sensor that acquires a pulse wave (e.g., a photoplethysmogram (PPG)) from a finger. The LED photodetector 120 receives reflected light from light irradiated onto the fingertip and acquires the pulse wave based on the received reflected light. The light source that irradiates the fingertip with light is, for example, an LED. The LED photodetector 120 is an example of a "photoelectric sensor." A finger is an example of a "living body."

<Processing blocks of the smartphone 100>
3 is a diagram showing an example of a processing block of the smartphone according to the embodiment. The smartphone 100 includes a guidance unit 11, a touch position acquisition unit 12, a pressure acquisition unit 13, a tilt acquisition unit 14, a pulse wave acquisition unit 15, and a setting information storage unit 16. The smartphone 100 executes processing as each unit of the smartphone 100, such as the guidance unit 11, the touch position acquisition unit 12, the pressure acquisition unit 13, the tilt acquisition unit 14, the pulse wave acquisition unit 15, and the setting information storage unit 16, by the CPU 101 executing a computer program executablely deployed in the main storage unit 102.

The guidance unit 11 displays a measurement screen on the display 113 to guide the user through the procedure for acquiring a pulse wave. Fig. 4 is a diagram showing an example of the measurement screen in the embodiment. The measurement screen 200 includes a position guidance icon 201, a pressure gauge 202, and a tilt gauge 203.

The position guidance icon 201 guides the user as to where to place their thumb when acquiring a pulse wave. The position at which the position guidance icon 201 is displayed is a position that overlaps with the pressure detection panel 115 when viewed from the front. When acquiring a pulse wave, for example, the thumb of the right hand is placed on the position guidance icon 201 and the index finger of the right hand is placed on the LED photodetector 120. In other words, the pulse wave is acquired with the smartphone 100 held in one hand.

The pressure gauge 202 visually displays the pressure with which the user presses the display 113 with a finger or the like. In the pressure gauge 202 illustrated in FIG. 4, multiple squares are arranged in a horizontal row. In the pressure gauge 202, the color of the square among the multiple squares that corresponds to the detected pressure is displayed in a different manner from the other squares, thereby visually displaying the pressure with which the user presses the display 113 with a finger or the like. Note that the example in FIG. 4 illustrates a case in which the pressure with which the user presses the display 113 with a finger or the like in the range of 1.5 (N/m) to 2.0 (N/m) is a pressure suitable for acquiring a pulse wave.

The tilt gauge 203 visually displays the tilt of the smartphone 100. The tilt of the smartphone 100 can be indicated, for example, by the angle between the vertical direction and the housing 110 of the smartphone 100. In the tilt gauge 203 illustrated in FIG. 4, multiple rectangles are arranged in a horizontal row. In the tilt gauge 203, the color of the rectangle that corresponds to the detected tilt of the smartphone 100 is displayed in a different manner from the other rectangles, thereby visually displaying the tilt of the smartphone 100. Note that the example in FIG. 4 illustrates a case in which the tilt of the smartphone 100 in the front-to-rear direction is in the range of -5 degrees to +5 degrees, which is an example of a tilt suitable for acquiring a pulse wave.

The touch position acquisition unit 12 acquires position information indicating the position where the user performed a touch operation from the touch panel 114. The position information is, for example, coordinates corresponding to the touch position.

The pressure acquisition unit 13 acquires the pressure with which the user presses the display 113 with a finger or the like from the pressure detection panel 115. The tilt acquisition unit 14 acquires the tilt of the smartphone 100 from the tilt sensor 116.

The guidance unit 11 displays the pressure acquired by the pressure acquisition unit 13 on the pressure gauge 202. The guidance unit 11 also displays the pressure acquired by the tilt acquisition unit 14 on the tilt gauge 203. Through such processing, the guidance unit 11 can inform the user whether the pressure applied to the display 113 or the tilt of the smartphone 100 is within an acceptable range suitable for acquiring a pulse wave.

The pulse wave acquisition unit 15 acquires a pulse wave from the LED photodetector 120 when both the pressure acquired by the pressure acquisition unit 13 and the slope acquired by the slope acquisition unit 14 are within an acceptable range suitable for acquiring a pulse wave.

The setting information storage unit 16 stores various setting information. Examples of setting information include a pressure range suitable for acquiring a pulse wave, a slope range suitable for acquiring a pulse wave, etc.

<Use of smartphone 100>
5 and 6 are diagrams showing an example of a usage state of the smartphone according to the embodiment. In Fig. 5 and Fig. 6, a case where pulse wave measurement is performed without placing the smartphone 100 on a stand such as a table is illustrated. Fig. 5 illustrates the smartphone 100 as viewed from the front side. Also,
Fig. 6 illustrates a state in which the smartphone 100 is viewed from the side. Figs. 5 and 6 illustrate a state in which the housing 110 of the smartphone 100 is aligned vertically (a state in which the housing 110 is not tilted). Pulse wave measurement using the smartphone 100 is performed, for example, with the thumb Y1 of the right hand in contact with the position of the position guidance icon 201 and the index finger Y2 of the right hand in contact with the LED photodetector 120.

When the smartphone 100 is not tilted, the pressure detected by the pressure detection panel 115 located at the position of the location guidance icon 201 and the pressure applied to the LED photodetector 120 are approximately equal. Therefore, the pulse wave acquisition unit 15 can determine whether the pressure applied to the LED photodetector 120 is suitable for acquiring a pulse wave based on the pressure detected by the pressure detection panel 115. Note that although FIGS. 5 and 6 show an example in which pulse wave measurement is performed with the right hand, pulse wave measurement may also be performed with the left hand.

7 and 8 are diagrams showing an example of a usage mode of the smartphone according to the embodiment. In FIG. 7 and FIG. 8, a case where pulse wave measurement is performed with the lower end of the smartphone 100 placed on a table T1 is illustrated. When the smartphone 100 is tilted in either the forward or backward direction, the force F1 applied to the pressure detection panel 115 and the force F2 applied to the LED photodetector 120 do not match. That is, if the mass of the smartphone 100 is M, the gravitational acceleration is g, and the angle between the up-down direction of the smartphone 100 and the vertical direction is θ, the force F2 is F1 + Mg · sin θ. Therefore, when the smartphone 100 is tilted in either the forward or backward direction, even if the pressure detected by the pressure detection panel 115 indicates a value suitable for pulse wave measurement, the pressure applied to the LED photodetector 120 is not necessarily suitable for pulse wave measurement.

<Processing flow of the smartphone 100>
9 is a diagram showing an example of a process flow of pulse wave measurement using the smartphone according to the embodiment. Hereinafter, an example of a process flow of pulse wave measurement using the smartphone 100 will be described with reference to FIG.

At T1, the guide unit 11 displays the measurement screen 200 on the display 113. At T2, the pulse wave acquisition unit 15 determines whether or not the LED photodetector 120 detects a finger. For example, the pulse wave acquisition unit 15 can cause the LED photodetector 120 to emit light and determine whether or not a finger has been detected based on the reflected light. If a finger has been detected (YES at T2), the process proceeds to T3. If a finger has not been detected (NO at T2), the process of T2 is repeated.

At T3, the pressure acquisition unit 13 determines whether or not the pressure detection panel 115 detects a finger. For example, the pressure acquisition unit 13 can determine that a finger has been detected when the pressure detected by the pressure detection panel 115 is equal to or greater than a threshold value. If a finger is detected (YES at T3), the process proceeds to T4. If a finger is not detected (NO at T3), the process of T3 is repeated.

At T4, the guidance unit 11 outputs the pressure acquired by the pressure acquisition unit 13 and the tilt of the smartphone 100 acquired by the tilt acquisition unit 14 to the measurement screen 200.

At T5, the pressure acquisition unit 13 determines whether the pressure detected by the pressure detection panel 115 is within the range of pressures suitable for acquiring a pulse wave, which is stored in the setting information storage unit 16. If it is within the range of pressures suitable for acquiring a pulse wave (YES at T5), the process proceeds to T6. If it is not within the range of pressures suitable for acquiring a pulse wave (NO at T5), the process proceeds to T8.

At T6, the tilt acquisition unit 14 determines whether the tilt of the smartphone 100 detected by the tilt sensor 116 is within the range of tilts suitable for acquiring a pulse wave stored in the setting information storage unit 16. If it is within the range of tilts suitable for acquiring a pulse wave (YES at T6), the process proceeds to T7. If it is not within the range of tilts suitable for acquiring a pulse wave (NO at T6), the process proceeds to T9.

At T7, the pulse wave acquisition unit 15 acquires a pulse wave from the finger using the LED photodetector 120. If the period during which the pulse wave acquisition unit 15 acquired the pulse wave reaches a predetermined acquisition period (YES at T7), the pulse wave acquisition is terminated. If the period during which the pulse wave acquisition unit 15 acquired the pulse wave does not reach the predetermined acquisition period (YES at T7), the process proceeds to T4.

At T8, the guidance unit 11 guides the user so that the finger pressure is suitable for measurement. For example, if the pressure is too high, the guidance unit 11 may output a message on the measurement screen 200 instructing the user to reduce the pressure of the finger. The guidance unit 11 may also guide the user by the pressure gauge 202.

At T9, the guidance unit 11 guides the user so that the smartphone 100 is tilted to an appropriate angle for measurement. For example, when the smartphone 100 is tilted forward, the guidance unit 11 may output a guidance message to tilt the smartphone 100 backward on the measurement screen 200. The guidance unit 11 may also guide the user by the tilt gauge 203.

By repeating the processes from T4 to T9 at a predetermined interval, the smartphone 100 can acquire a pulse wave while prompting the user to correct the pressure of the finger or the tilt of the smartphone 100.

<Effects of the embodiment>
When the smartphone 100 is tilted, the pressure detected by the pressure detection panel 115 and the pressure applied to the LED photodetector 120 do not match. Therefore, in this embodiment, the guide unit 11 uses the tilt gauge 203 to guide the user as to whether the smartphone 100 is at a suitable angle for pulse wave measurement, thereby urging the user to correct the tilt of the smartphone 100. When the tilt of the smartphone 100 is eliminated, the pulse wave acquisition unit 15 can determine the pressure applied to the LED photodetector 120 with high accuracy. Thus, according to this embodiment, the smartphone 100 can improve the measurement accuracy of pulse wave measurement.

<Modification>
In the embodiment described above, when the smartphone 100 is tilted, the user is prompted to correct the tilt. In the modified example, when the smartphone 100 is tilted, the pressure detected by the pressure detection panel 115 is corrected according to the tilt. The same components as those in the embodiment are given the same reference numerals, and the description thereof will be omitted. Hereinafter, the smartphone according to the modified example will be described with reference to the drawings.

FIG. 10 is a diagram showing an example of a processing block of a smartphone according to a modified example. The smartphone 100a according to the modified example differs from the smartphone 100 according to the embodiment in that it includes a correction unit 17.

The correction unit 17 corrects the pressure acquired by the pressure acquisition unit 13 in accordance with the inclination acquired by the inclination acquisition unit 14. For example, when the smartphone 100a is inclined at an angle θ from the vertical direction as illustrated in FIG. 8, the correction unit 17 calculates Mg·si
By adding nθ, the pressure applied to the LED photodetector 120 is calculated.

Figure 11 is a diagram showing an example of a processing flow of a smartphone according to a modified example. Below, an example of the processing flow of the smartphone 100a is described with reference to Figure 11.

At W1, the correction unit 17 corrects the pressure detected by the pressure detection panel 115 based on the tilt detected by the tilt sensor 116. At W2, the guidance unit 11 displays the pressure after correction by W1 on the measurement screen 200.

In W3, the pulse wave acquisition unit 15 determines whether the pressure after correction by W1 is within the set range. If it is within the set range (YES in W3), the process proceeds to T7. If it is outside the set range (NO in W3), the process proceeds to W4.

At W4, the guidance unit 11 guides the user so that the corrected pressure becomes a pressure suitable for measurement. For example, if the corrected pressure is too high, the guidance unit 11 may output a guidance message to the measurement screen 200 to reduce the pressure of the finger. The guidance unit 11 may also guide the user by the pressure gauge 202.

According to the smartphone 100a of the modified example, even if the smartphone 100a is tilted, the pressure is corrected based on the tilt, so pulse waves can be obtained with high accuracy.

The embodiments and variations disclosed above can be combined with each other.

<<Computer-readable recording medium>>
An information processing program that causes a computer or other machine or device (hereinafter, computer, etc.) to realize any of the above functions can be recorded on a recording medium that can be read by the computer, etc. Then, the computer, etc. can provide the function by reading and executing the program from the recording medium.

Here, a computer-readable recording medium refers to a recording medium that stores information such as data and programs electrically, magnetically, optically, mechanically, or chemically and can be read by a computer. Examples of such recording media that can be removed from a computer include flexible disks, magneto-optical disks, Compact Disc Read Only Memory (CD-ROM), Compact Disc-Recordable (CD-R), Compact Disc-ReWritable (CD-RW), Digital Versatile Disc (DVD), Blu-ray Disc (BD), Digital Audio Tape (DAT), 8mm tape, and memory cards such as flash memory. Additionally, examples of recording media that are fixed to a computer include hard disks and ROMs.

100, 100a... Smartphone 101... CPU
102: Main memory unit 103: Auxiliary memory unit 104: Communication unit 111: Speaker 112: Microphone 113: Display 114: Touch panel 115: Pressure detection panel 116: Tilt sensor 110: Housing 120: LED photodetector 11: Guidance unit 12: Touch position acquisition unit 13: Pressure acquisition unit 14: Tilt acquisition unit 15: Pulse wave acquisition unit 16: Setting information storage unit 17: Correction unit 200: Measurement screen 201: Position guidance icon 202: Pressure gauge 203: Tilt gauge

Claims (10)

A photoelectric sensor is provided on the rear surface of a plate-shaped housing and acquires a pulse wave from a living body that comes into contact with the photoelectric sensor;
a pressure sensor provided on a front surface of the housing and detecting a pressure applied to a position overlapping with the photoelectric sensor when viewed in a normal direction of the front surface;
a tilt sensor that detects a direction of gravitational acceleration and detects a tilt of the housing in a front-rear direction based on the detected direction of gravitational acceleration ;
and a control unit that causes the photoelectric sensor to acquire a pulse wave when the pressure detected by the pressure sensor is within a preset allowable range and the direction of the gravitational acceleration detected by the tilt sensor is along an in-plane direction of the back surface .
Mobile device. When the pressure detected by the pressure sensor is outside the allowable range, the control unit provides guidance so that the pressure detected by the pressure sensor is within the allowable range.
The mobile terminal according to claim 1 . When the direction of the gravitational acceleration detected by the tilt sensor is not aligned with the in-plane direction of the back surface , the control unit guides the direction of the gravitational acceleration detected by the tilt sensor to be aligned with the in-plane direction of the back surface .
3. The mobile terminal according to claim 1 or 2. A photoelectric sensor is provided on the rear surface of a plate-shaped housing and acquires a pulse wave from a living body that comes into contact with the photoelectric sensor;
a pressure sensor provided on a front surface of the housing and detecting a pressure applied to a position overlapping with the photoelectric sensor when viewed in a normal direction of the front surface;
a tilt sensor that detects a tilt in a front-rear direction of the housing;
a correction unit that corrects the pressure detected by the pressure sensor in accordance with the tilt detected by the tilt sensor;
and a control unit that causes the photoelectric sensor to acquire a pulse wave when the corrected pressure is within a preset allowable range.
Mobile device. When the corrected pressure is outside the preset allowable range, the control unit provides guidance so that the corrected pressure is within the preset allowable range.
The mobile terminal according to claim 4. a display unit is provided on the front surface so as to overlap at least a portion of the display unit with the pressure sensor;
The control unit outputs a position image indicating a position of the pressure sensor to the display unit.
A mobile terminal according to any one of claims 1 to 5. A computer comprising: a photoelectric sensor provided on a rear surface of a plate-shaped housing, the photoelectric sensor acquiring a pulse wave from a living body in contact with the body; a pressure sensor provided on a front surface of the housing, the pressure sensor detecting a pressure applied to a position overlapping with the photoelectric sensor when viewed in a normal direction of the front surface; and a tilt sensor detecting a direction of gravitational acceleration and detecting a tilt of the housing in a front-rear direction based on the detected direction of gravitational acceleration,
When the pressure detected by the pressure sensor is within a preset allowable range and the direction of the gravitational acceleration detected by the tilt sensor is along an in-plane direction of the back surface , the photoelectric sensor is caused to acquire a pulse wave.
How to obtain a pulse wave. A computer includes a photoelectric sensor provided on a rear surface of a plate-shaped housing and configured to acquire a pulse wave from a living body that comes into contact with the photoelectric sensor, a pressure sensor provided on a front surface of the housing and configured to detect a pressure applied to a position that overlaps with the photoelectric sensor when viewed in a normal direction of the front surface, and a tilt sensor that detects a direction of gravitational acceleration and detects a tilt of the housing in a front-rear direction based on the detected direction of gravitational acceleration .
When the pressure detected by the pressure sensor is within a preset allowable range and the direction of the gravitational acceleration detected by the tilt sensor is along an in-plane direction of the back surface , the photoelectric sensor is caused to acquire a pulse wave.
Pulse wave acquisition program. A computer including a photoelectric sensor provided on a rear surface of a plate-shaped housing and configured to acquire a pulse wave from a living body in contact with the photoelectric sensor, a pressure sensor provided on a front surface of the housing and configured to detect a pressure applied to a position overlapping with the photoelectric sensor when viewed in a normal direction of the front surface, and an inclination sensor for detecting an inclination of the housing in a front-rear direction,
correcting the pressure detected by the pressure sensor in accordance with the tilt detected by the tilt sensor;
When the corrected pressure is within a preset allowable range, the photoelectric sensor is caused to acquire a pulse wave.
How to obtain a pulse wave. A computer including a photoelectric sensor provided on a rear surface of a plate-shaped housing and configured to acquire a pulse wave from a living body in contact with the photoelectric sensor, a pressure sensor provided on a front surface of the housing and configured to detect a pressure applied to a position overlapping with the photoelectric sensor when viewed in a normal direction of the front surface, and an inclination sensor for detecting an inclination of the housing in a front-rear direction,
correcting the pressure detected by the pressure sensor in accordance with the inclination detected by the inclination sensor;
When the corrected pressure is within a preset allowable range, the photoelectric sensor is caused to acquire a pulse wave.
Pulse wave acquisition program.

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