JP7457438B2 - Biometric information acquisition device - Google Patents

Description

The present invention relates to a biological information acquisition device.

2. Description of the Related Art Devices are used to acquire biological information such as pulse waves from a biological body such as a fingertip. Patent Document 1 describes a pulse wave detection device that measures a pulse wave based on an image of a fingertip taken with a camera. Further, in Patent Document 2, in a device that acquires biometric information based on an image of a fingertip taken with a camera, a guidance method is provided that guides whether the fingertip is correctly placed on the camera part based on external light that reaches the camera. Are listed.

JP2009-297233A JP2009-297235A

A biometric information acquisition device has been proposed that acquires biometric information from a living body using a photoelectric sensor. Such a biometric information acquisition device irradiates light emitted from a light source onto the living body, and acquires the biometric information based on the reflected light from the living body that is received by the photoelectric sensor. Even with such a biometric information acquisition device, the accuracy of acquiring the biometric information decreases if the living body is not placed correctly relative to the photoelectric sensor.

One aspect of the disclosed technology is to provide a biological information acquisition device, a biological information acquisition method, and a biological information acquisition program that can detect that a living body is placed in a preferable position with respect to a photoelectric sensor that acquires biological information. purpose.

One aspect of the disclosed technology is exemplified by the following biological information acquisition device. This biological information acquisition device includes a photoelectric sensor that is provided on the outer surface of a housing and that acquires biological information from a living body that comes in contact with the body, a groove that is arranged on the outer surface so as to sandwich the photoelectric sensor, and a a microphone into which sound is input; a determining unit that determines whether the living body covers the entire photoelectric sensor based on the level of the sound input into the microphone; and a control unit that causes the photoelectric sensor to acquire the biological information when the biological information is covered.

The disclosed technology can detect that a living body is placed at a preferable position relative to a photoelectric sensor that acquires biological information.

FIG. 1 is a diagram showing the appearance of a smartphone according to an embodiment. FIG. 2 is an enlarged view of the periphery of an opening provided on the rear surface of the housing of the smartphone according to the embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 4 is a sectional view taken along line BB in FIG. FIG. 5 is a diagram illustrating an example of the hardware configuration of the smartphone according to the embodiment. FIG. 6 is a diagram illustrating an example of processing blocks of the smartphone according to the embodiment. FIG. 7 is a first diagram illustrating a state in which a finger is in contact with a photoplethysmographic sensor in the embodiment. FIG. 8 is a second diagram illustrating a state in which a finger is in contact with a photoplethysmographic sensor in the embodiment. FIG. 9 is a first diagram illustrating the level of sound input to the internal microphone in the embodiment. FIG. 10 is a second diagram illustrating the level of sound input to the internal microphone in the embodiment. FIG. 11 is a diagram illustrating an example of a processing flow of the smartphone according to the embodiment. FIG. 12 is a diagram illustrating the appearance of a smartphone according to the first modification. FIG. 13 is a diagram illustrating an example of the hardware configuration of a smartphone according to the first modification. FIG. 14 is a diagram illustrating an example of a processing block of a smartphone according to the first modification. FIG. 15 is a first diagram illustrating the level of sound input to the internal microphone in the first modification. FIG. 16 is a second diagram illustrating the level of sound input to the internal microphone in the first modified example. FIG. 17 is a diagram illustrating variations in the arrangement of grooves.

<Embodiment>
The biological information acquisition device according to the embodiment includes, for example, the following configuration. The biological information acquisition device according to the embodiment includes:
A photoelectric sensor that is installed on the outer surface of the housing and acquires biological information from living organisms that come into contact with it;
a groove arranged on the outer surface to sandwich the photoelectric sensor;
a microphone into which sound outside the housing is input through the groove;
a determination unit that determines whether the living body covers the entire photoelectric sensor based on the level of sound input to the microphone;
The apparatus further includes a control unit that causes the photoelectric sensor to acquire the biological information when the living body covers the entire photoelectric sensor.

A photoelectric sensor irradiates light onto a living body that comes into contact with the photoelectric sensor, and acquires biological information based on the intensity of the reflected light. The light source of the photoelectric sensor is, for example, a light emitting diode (LED). Since a photoelectric sensor acquires biological information using light, in order to acquire biological information with high precision, it is preferable that the entire photoelectric sensor is covered by the living body so that light from the outside does not enter the photoelectric sensor. Examples of the living body that comes into contact with the photoelectric sensor include fingertips, earlobes, wrists, and the like.

A groove is provided in the housing of the biological information acquisition device so as to sandwich the photoelectric sensor therebetween. Here, the groove may be provided so as to surround the photoelectric sensor. For example, when the entire photoelectric sensor is covered by a living body, the groove is placed at a position where the entire groove is covered by the living body.

The biometric information acquisition device is provided with a microphone that inputs sound from outside the housing through a groove provided in the housing. The extent of the groove blocked by the living organism varies depending on the position of the living organism in contact with the photoelectric sensor. The level of sound (sound pressure) input to the microphone varies depending on whether the entire groove is blocked by the living organism. The biometric information acquisition device can determine whether the living organism covers the entire photoelectric sensor based on the level of sound input to the microphone. With such features, the biometric information acquisition device can detect that the living organism is placed in a preferred position relative to the photoelectric sensor that acquires the biometric information. Furthermore, the biometric information acquisition device can cause the photoelectric sensor to acquire biometric information when the living organism is placed in a preferred position relative to the photoelectric sensor that acquires the biometric information.

The biometric information acquisition device may have the following features: The microphone is housed in the internal space of the housing, and the groove is provided with a communication hole that connects the outside of the housing to the internal space. By having such features, sounds from outside the housing can be easily input to the microphone.

The biometric information acquisition device may have the following features. The photoelectric sensor is provided on the back of the housing. If the photoelectric sensor is provided on the back, it is difficult to visually confirm whether the living body is placed so as to cover the entire photoelectric sensor. As described above, the biometric information acquisition device determines whether the living body covers the entire photoelectric sensor based on the level of sound input to the microphone, so that even if the photoelectric sensor is provided on the back of the housing, it can easily detect that the living body is placed in a favorable position relative to the photoelectric sensor.

The biometric information acquisition device may have the following features. A sound source that outputs a sound of a predetermined frequency is provided on the outer surface of the housing, and the determination unit determines whether the living body covers the entire photoelectric sensor based on the level of sound input from the sound source to the microphone. Determine whether or not the By having such a feature, the determination unit only has to focus on the sound of a predetermined frequency to make a determination, so that the influence of noise input from the outside on the determination accuracy is suppressed.

An embodiment in which the biological information acquisition device described above is applied to a smartphone will be described with reference to the drawings. FIG. 1 illustrates the appearance of a smartphone according to an embodiment as seen from one side (the front side appearance) and the other side (the back side appearance). In FIG. 1, the front side and the back side of the smartphone 100 are alternately arranged and illustrated by arrows. Smartphone 100 has a plate-shaped housing 110. Although not illustrated in FIG. 1, the distance (thickness) between the front and back surfaces of the housing 110 is short compared to the external dimensions of the front or back surfaces. In FIG. 1, it is assumed that the upper side of the paper is the upper side of the casing 110, and the lower side of the paper is the lower side of the casing 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 that is orthogonal to the Y direction is also referred to as the X direction. Further, the thickness direction of the housing 110 is also referred to as the Z direction.

As shown in FIG. 1, a display 113 is provided on the front surface of the housing 110. A speaker 111 is provided at a central position above the display 113. The front surface corresponds to the first outer surface of the housing 110.

An opening 122 that penetrates the housing 110 in the thickness direction is formed on the back surface of the housing 110. The position where the opening 122 is provided is, for example, when the housing 110 is gripped with one hand and the finger of the gripped hand is extended toward the opening 122, the fingertip of the finger reaches the opening 122 from diagonally below the opening 122. This is the position where it reaches. A cover glass 123 is provided in the opening 122 so as to close the hole formed by the opening 122 . The cover glass 123 is made of a material that transmits light. A photoplethysmographic sensor 121 that acquires a pulse wave from a fingertip is placed directly below the opening 122 . The photoplethysmographic sensor 121 detects a fingertip pulse wave through a cover glass 123 provided in the opening 122 . Therefore, in this embodiment, the sensor including the photoplethysmographic sensor 121 and the cover glass 123 provided in the opening 122 can be called a sensor that detects the pulse wave at the fingertip.

FIG. 2 is an enlarged view of the periphery of the opening provided on the back surface of the housing of the smartphone according to the embodiment. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. FIG. 4 is a sectional view taken along line BB in FIG. 2. A groove 124 is provided on the back surface of the housing 110 so as to surround the opening 122 by recessing the housing 110 in the thickness direction. That is, the groove 124 surrounds the photoplethysmographic sensor 121 . A through hole 125 that communicates between the inside and outside of the housing 110 is provided in a part of the groove 124 . The groove 124 is provided at a position where the entire groove 124 is closed by the fingertip when the fingertip covers the entire surface of the opening 122, that is, the photoplethysmographic sensor 121.

As can be understood with reference to FIGS. 3 and 4, the photoplethysmographic sensor 121 and the internal microphone 114 are provided on the internal substrate B1. Note that the photoplethysmographic sensor 121 and the internal microphone 114 may be provided on different substrates. Internal microphone 114 is located below through-hole 125. By providing the through hole 125 in the groove 124 at a position corresponding to the internal microphone 114, sound from outside the housing 110 can be easily input to the internal microphone 114. Note that a waterproof and moisture-permeable membrane may be provided in the through hole 125 in order to prevent water from entering the inside of the housing 110 and to discharge moisture inside the housing 110 to the outside.

FIG. 5 is a diagram illustrating an example of the hardware configuration of the smartphone according to the embodiment. The smartphone 100 includes a Central Processing Unit (CPU) 101, a main memory section 102, an auxiliary memory section 103, a communication section 104, a speaker 111, a telephone microphone 112, a display 113, an internal microphone 114, a photoplethysmographic sensor 121, and a connection bus B1. including. The CPU 101, main storage section 102, auxiliary storage section 103, communication section 104, display 113, and photoplethysmographic sensor 121 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 multiprocessor configuration. Further, a single CPU 101 connected through a single socket may have a multi-core configuration. At least part of the processing executed by the CPU 101 is 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. It's okay. Furthermore, at least part of the processing executed by the CPU 101 may be executed by an integrated circuit (IC) or other digital circuit. Furthermore, at least a portion of the CPU 101 may include an analog circuit. Integrated circuits include large scale integrated circuits (LSIs), application specific integrated circuits (ASICs), and programmable logic devices (PLDs). The PLD includes, for example, a field-programmable gate array (FPGA). 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, or the like. In the smartphone 100, the CPU 101 loads the program stored in the auxiliary storage unit 103 into the work area of the main storage unit 102, and controls peripheral devices through execution of the program. Thereby, the smartphone 100 can perform processing that meets a predetermined purpose. The main storage unit 102 and the auxiliary storage unit 103 are recording media that can be read by the smartphone 100.

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

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

The auxiliary storage unit 103 is, for example, an erasable programmable ROM (EPROM), a solid state drive (SSD), a hard disk drive (HDD), or the like. Further, the auxiliary storage unit 103 is, for example, a Compact Disc (CD) drive device, a Digital Versatile Disc (DVD) drive device, a Blu-ray (registered trademark) Disc (BD) drive device, or the like. Further, the auxiliary storage unit 103 may be provided by Network Attached Storage (NAS) or Storage Area Network (SAN).

The communication unit 104 is, for example, an interface with a computer network that communicably connects the information processing device. The communication unit 104 communicates with an external device via a computer network.

The speaker 111 is a sound source that outputs sound. The speaker 111 outputs sound such as the voice of the other party during a call using the smartphone 100. The call microphone 112 is a microphone that is mainly used for calls. The call microphone 112 accepts input of sound such as 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 storage 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 internal microphone 114 is a microphone that receives sound input from the outside. Sound input to the internal microphone 114 includes sound input from outside the housing 110 through the through hole 125. The internal microphone 114 is used, for example, to remove noise caused by sound from the outside.

The photoplethysmographic sensor 121 is a sensor that acquires a pulse wave from a fingertip. The photoplethysmographic sensor 121 receives the reflected light of the light irradiated to the finger, and acquires a pulse wave based on the received reflected light. The light source that irradiates the fingertip with light may be integrated with the photoplethysmographic sensor 121 or may be separate. The light source is, for example, a light emitting diode (LED).

The smartphone 100 may further include, for example, an input unit that receives operation instructions from a user or the like. Examples of such an input unit include input devices such as a keyboard, a pointing device, and a touch panel.

<Processing blocks of the smartphone 100>
6 is a diagram showing an example of a processing block of a smartphone according to an embodiment. The smartphone 100 includes a determination unit 11, a notification unit 12, and a measurement unit 13. The smartphone 100 executes the processes of each unit of the smartphone 100, such as the determination unit 11, the notification unit 12, and the measurement unit 13, by the CPU 101 executing a computer program executablely deployed in the main storage unit 102.

The determination unit 11 determines whether or not the fingertip of the person being measured covers the entire photoplethysmographic sensor 121 based on the level of the sound input to the internal microphone 114. Figs. 7 and 8 are diagrams illustrating a state in which a finger is in contact with the photoplethysmographic sensor in an embodiment. Fig. 7 illustrates a state in which the fingertip F covers the entire photoplethysmographic sensor 121. Fig. 8 illustrates a state in which at least a portion of the photoplethysmographic sensor 121 is not covered by the fingertip F. In Fig. 7, the fingertip F covers the entire photoplethysmographic sensor 121, so that the entire groove 124 surrounding the photoplethysmographic sensor 121 is also covered by the fingertip F. On the other hand, in Fig. 8, at least a portion of the photoplethysmographic sensor 121 is not covered by the fingertip F, so that at least a portion of the groove 124 is not covered by the fingertip F.

9 and 10 are diagrams illustrating the level of sound input to the internal microphone in the embodiment. The vertical axes in FIGS. 9 and 10 illustrate sound pressure (dBV), and the horizontal axes illustrate frequency (Hz). Sound pressure is also called level. FIG. 9 illustrates the sound pressure of the sound input to the internal microphone in a state where the fingertip F covers the entire photoplethysmographic sensor 121 (the state illustrated in FIG. 7). FIG. 10 illustrates the sound pressure of the sound input to the internal microphone in a state where at least a portion of the photoplethysmographic sensor 121 is not covered by the fingertip F (the state illustrated in FIG. 8).

As can be understood by comparing FIGS. 9 and 10, when the entire photoplethysmographic sensor 121 is covered by the fingertip F and the entire groove 124 is covered by the fingertip F, the noise level input to the internal microphone 114 (floor noise ) becomes low as illustrated in FIG. On the other hand, if at least a portion of the photoplethysmographic sensor 121 is not covered by the fingertip F and at least a portion of the groove 124 is not covered by the fingertip F, the noise level (floor noise) input to the internal microphone 114 will be It becomes high as illustrated in FIG. The determining unit 11 determines whether the fingertip F of the subject covers the entire photoplethysmographic sensor 121 based on the level of floor noise input to the internal microphone 114 . For example, if the level of the floor noise input to the internal microphone 114 is higher than the reference value set between the level illustrated in FIG. 9 and the level illustrated in FIG. , it may be determined that the fingertip F of the person to be measured does not cover the entire photoplethysmogram sensor 121.

When the determination unit 11 determines that the fingertip F does not cover the entire photoplethysmographic sensor 121, the notification unit 12 notifies the person to that effect. The notification unit 12 notifies the subject by, for example, outputting a message to the display 113 to the effect that the position of the fingertip F has shifted from the photoplethysmographic sensor 121.

The measuring unit 13 causes the photoplethysmographic sensor 121 to acquire biological information when the determining unit determines that the fingertip F1 covers the entire photoplethysmographic sensor 121. The measuring unit 13 acquires measured values such as heart rate, blood pressure, pulse wave, and arterial blood oxygen saturation based on the acquired biological information.

FIG. 11 is a diagram illustrating an example of a processing flow of the smartphone according to the embodiment. Hereinafter, with reference to FIG. 11, an example of the processing flow of the smartphone 100 according to the embodiment will be described.

At T1, the measurement unit 13 turns on the light source of the photoplethysmogram sensor 121. At T2, the determination unit 11 obtains the level of the sound input to the internal microphone 114. If the acquired level is below the reference value (YES at T3), the process proceeds to T4. If the acquired level is greater than the reference value (NO at T3), the process proceeds to T7.

At T4, the measuring unit 13 causes the photoplethysmographic sensor 121 to acquire biological information. When the acquisition of biometric information is completed (YES at T5), the process proceeds to T6. If the acquisition of biometric information is not completed (NO at T5), the process proceeds to T3.

At T6, the measurement unit 13 acquires measurements such as heart rate, blood pressure, pulse wave, and arterial blood oxygen saturation based on the biological information acquired at T4. The measurement unit 13 displays the acquired measurements on the display 113.

At T7, the notification unit 12 notifies the subject that the position of the fingertip F has shifted from the photoplethysmographic sensor 121.

<Actions and effects of embodiments>
The smartphone according to the embodiment determines whether the fingertip F of the subject covers the entire photoplethysmographic sensor 121 based on the level of floor noise input to the internal microphone 114. Therefore, according to the present embodiment, the subject's fingertip F can cover the entire photoplethysmographic sensor 121 without providing hardware such as a sensor for detecting the contact of the finger F around the photoplethysmographic sensor 121. It can be detected that there is a Furthermore, since the smartphone according to the embodiment can determine whether or not the fingertip F covers the entire photoplethysmographic sensor 121, the photoplethysmographic sensor 121, which is difficult for the subject to see, is provided on the back of the housing 110. Even if the photoplethysmographic sensor 121 is covered entirely with the finger F, it becomes easy to touch the entire photoplethysmographic sensor 121.

In this embodiment, the groove 124 is provided with a through hole 125 . By providing the through hole 125 in the groove 124, sound from outside the housing 110 is easily input to the internal microphone 114 provided within the housing 110. Therefore, the determination accuracy of the determination unit 11 based on the level of the sound input to the internal microphone 114 can be improved.

<First modification example>
In the embodiment, the determination unit 11 makes the determination based on the level of sound input into the internal microphone 114 from around the housing 110 . In the first modification, a configuration will be described in which a sound source is provided on the outer surface of the housing 110, and the determination unit 11 makes a determination based on the level of sound input from the sound source to the internal microphone 114. Components that are the same as those in the embodiment are denoted by the same reference numerals, and their descriptions will be omitted. The first modification will be described below with reference to the drawings.

FIG. 12 is a diagram illustrating the appearance of a smartphone according to the first modification. In FIG. 12, the back surface of a smartphone 100a according to the first modification is illustrated. The smartphone 100a differs from the smartphone 100 according to the embodiment in that a sound source 115 is provided outside the back surface of the housing 110. The sound source 115 is preferably provided on the back surface of the housing 110 near the through hole 125.

Figure 13 is a diagram showing an example of the hardware configuration of a smartphone according to the first modified example. Sound source 115 is a sound source that outputs a sound with a frequency of 1 kHz. Note that the frequency of 1 kHz is an example of the frequency of the sound output by sound source 115, and sound source 115 may output sounds of other frequencies. Sound source 115 outputs a sound of a predetermined frequency, for example, in response to an instruction from determination unit 11a, which will be described later.

FIG. 14 is a diagram illustrating an example of a processing block of a smartphone according to the first modification. The smartphone 100a differs from the smartphone 100 according to the embodiment in that it includes a determination unit 11a instead of the determination unit 11.

The determining unit 11a determines whether the subject's fingertip covers the entire photoplethysmographic sensor 121 based on the level of the sound input from the sound source 115 to the internal microphone 114. 15 and 16 are diagrams illustrating the level of sound input to the internal microphone in the first modification. The vertical axis in FIGS. 15 and 16 illustrates sound pressure (dBV), and the horizontal axis illustrates frequency (Hz). FIG. 15 illustrates the sound pressure of the sound input to the internal microphone in a state where the fingertip F covers the entire photoplethysmographic sensor 121 (the state illustrated in FIG. 7). FIG. 16 illustrates the sound pressure of the sound input to the internal microphone in a state where at least a portion of the photoplethysmographic sensor 121 is not covered by the fingertip F (the state illustrated in FIG. 8).

As can be understood by comparing FIGS. 15 and 16, when the entire photoplethysmographic sensor 121 is covered by the fingertip F and the entire groove 124 is covered by the fingertip F, the sound from the sound source 115 is input to the internal microphone 114. The sound pressure (level) (sound with a frequency of 1 kHz) becomes low as illustrated in FIG. 15. On the other hand, if at least a portion of the photoplethysmographic sensor 121 is not covered by the fingertip F and at least a portion of the groove 124 is not covered by the fingertip F, the sound from the sound source 115 input to the internal microphone 114 is The pressure increases as illustrated in FIG. The determining unit 11a determines whether the fingertip F of the subject covers the entire photoplethysmographic sensor 121 based on the sound pressure of the sound from the sound source 115 input to the internal microphone 114.

In the first modification, the determination unit 11a makes the determination based on the level of the sound input from the sound source 115 to the internal microphone 114. Therefore, the determination unit 11a can perform determination with high accuracy even when the surroundings of the smartphone 100a are quiet.

<Variations in Groove Arrangement>
In the embodiment and the first modified example, the groove 124 is provided so as to surround the periphery of the photoplethysmographic sensor 121, but the groove 124 is not limited to such an arrangement. FIG. 17 is a diagram illustrating variations in the arrangement of the groove. FIG. 17(a) illustrates a groove 124 provided so as to surround the periphery of the photoplethysmographic sensor 121 in a C-shape. FIG. 17(b) illustrates a groove 124 formed in a substantially linear shape so as to sandwich the photoplethysmographic sensor 121. FIG. 17(c) illustrates grooves 124 formed in a substantially square shape at each of the four corners of the photoplethysmographic sensor 121, which is substantially rectangular in plan view. All of the variations of the groove 124 illustrated in FIG. 17 are provided so as to communicate with the space in the housing 110 in which the internal microphone 114 is housed. 17(a), (b), or (c), if at least a portion of groove 124 provided in housing 110 is not blocked, the sound pressure of the sound input to internal microphone 114 will be as shown in Fig. 10 or 16, and determination unit 11 (or determination unit 11a) will not determine that the subject's fingertip F covers the entire photoplethysmographic sensor 121. Even with groove 124 as exemplified in Fig. 17, determination unit 11 can determine whether or not the subject's fingertip F covers the entire photoplethysmographic sensor 121 based on the level of sound input to internal microphone 114.

The embodiments and modifications disclosed above can be combined.

<<Computer-readable recording medium>>
An information processing program that causes a computer or other machine or device (hereinafter referred to as a computer or the like) to realize any of the above functions can be recorded on a computer-readable recording medium. Then, by causing a computer or the like to read and execute the program on this recording medium, the function can be provided.

Here, a computer-readable recording medium is a recording medium that stores information such as data and programs through electrical, magnetic, optical, mechanical, or chemical action and can be read by a computer, etc. means. Examples of such recording media that are removable from computers and the like include flexible disks, magneto-optical disks, Compact Disc Read Only Memory (CD-ROM), Compact Disc-Recordable (CD-R), and Compact Disc-ReWriterable. (CD-RW), Digital Versatile Disc (DVD), Blu-ray Disc (BD), Digital Audio Tape (DAT), 8mm tape, and memory cards such as flash memory. In addition, there are hard disks, ROMs, etc. as recording media fixed to computers and the like.

100, 100a...Smartphone 101...CPU
102... Main memory section 103... Auxiliary memory section 104... Communication section 110... Housing 111... Speaker 112... Microphone for calling 113... Display 114... Internal microphone 115 ... Sound source 121 ... Photoplethysmographic sensor 122 ... Opening 123 ... Cover glass 124 ... Groove 125 ... Through hole 11, 11a ... Judgment section 12 ... Notification section 13 ...Measurement section

Claims (4)

A photoelectric sensor that is installed on the outer surface of the housing and acquires biological information from living organisms that come into contact with it;
a groove arranged on the outer surface to sandwich the photoelectric sensor;
a microphone into which sound outside the housing is input through the groove;
a determination unit that determines whether the living body covers the entire photoelectric sensor based on the floor noise level of the sound input to the microphone;
a control unit that causes the photoelectric sensor to acquire the biological information when the living body covers the entire photoelectric sensor;
Biological information acquisition device. The groove is provided so as to surround the photoelectric sensor,
The biological information acquisition device according to claim 1. The microphone is housed in an internal space of the housing, and the groove is provided with a communication hole that communicates the outside of the housing with the internal space.
The biological information acquisition device according to claim 1 or 2. The photoelectric sensor is provided on the rear surface of the housing.
The biometric information acquiring device according to claim 1 .

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