WO2025192008A1 - Biological information measurement device - Google Patents

Abstract

This biological information measurement device is used while worn on a human body. The biological information measurement device comprises at least a first electrode and a second electrode, and is configured to be capable of measuring an electrocardiographic waveform based on the potential difference between the first electrode and the second electrode. The biological information measurement device comprises: a body housing including a side surface formed of a conductive material and functioning as the first electrode, a bottom surface on which the second electrode is disposed and that comes into contact with the human body when the biological information measurement device is worn, and a top surface located opposite the bottom surface; an electrocardiographic signal detection circuit for detecting signals related to potentials of the first electrode and the second electrode; a first electric path that conducts the first electrode and the electrocardiographic signal detection circuit; and a second electric path on which an electrostatic discharge protection element is mounted, and that couples the first electrode and the second electrode via the electrostatic discharge protection element.

Description

Biological information measuring device

The present invention belongs to the field of healthcare-related technology, and in particular to biometric information measurement devices.

In recent years, it has become common for individuals to routinely measure their own physical and health information (hereinafter referred to as biometric information), such as blood pressure and electrocardiogram waveforms, using measuring devices and utilizing the measurement results for health management. This has led to an increasing demand for devices that emphasize portability, and many portable measuring devices have been proposed (for example, Patent Document 1).

Patent Document 1 discloses a wristwatch-type vital sign measuring device equipped with electrocardiogram electrodes and capable of measuring electrocardiogram waveforms. Since small-sized devices such as these wristwatch-type wearable devices do not have sufficient GND capacitance, when the screen display (display) is placed facing downwards during ESD (Electrostatic Discharge) testing, etc., if the housing is made of metal, static electricity may enter the control board connected to the device's ground (GND) from the metal housing to which ESD is applied, causing the control board to malfunction or components to be destroyed.

Note that, although it is a technical field different from electrocardiographs, a known technology for preventing malfunction of the control board and damage to the electronic circuit components mounted on the control board due to static electricity that has entered the metal casing is to ground (connect the metal casing to GND) (see, for example, Patent Document 2). The technology described in Patent Document 2 improves static electricity resistance by establishing electrical continuity between the conductive aluminum case and the ground of the control board.

JP 2024-14478 A Japanese Patent Application Laid-Open No. 2014-181562

However, if the housing of a device such as an electrocardiograph, which can be touched by the human body, is used as the ground, it will not be able to pass voltage resistance tests or leakage current tests from the perspective of safety standards (because when voltage is applied, current flows between the metal housing, which is the ground, and the electrocardiogram measurement electrodes).

In view of the above-mentioned problems, the present invention aims to provide technology that can achieve high static electricity resistance in a bioinformation measurement device that has a metal housing and is equipped with electrodes.

In order to solve the above problems, a biological information measuring device according to the present invention employs the following configuration:
A biological information measuring device that is worn on a human body, includes at least a first electrode and a second electrode, and is configured to be able to measure an electrocardiogram waveform based on a potential difference between the first electrode and the second electrode,
a main body housing including a side surface formed of a conductive material and functioning as the first electrode, a bottom surface on which the second electrode is disposed and which contacts the human body when worn, and a top surface opposite the bottom surface;
an electrocardiogram signal detection circuit that detects signals related to the potentials of the first electrode and the second electrode;
a first electrical path that connects the first electrode and the electrocardiogram signal detection circuit;
a second electric path on which an electrostatic discharge protection element is mounted and which connects the first electrode and the second electrode via the electrostatic discharge protection element;
The biological information measuring device has the following.

In other words, the first and second electrodes become conductive via the electrostatic discharge protection element only when a current exceeding a specific frequency and applied voltage is generated due to an electrostatic discharge phenomenon or the like. With this configuration, even if static electricity enters the vital signs measurement device via the second electrode or the like, the static electricity can be released to the main body housing as the first electrode via the electrostatic discharge protection element located on the electrocardiogram measurement signal line, where current flows easily.

As a result, it is possible to provide high static electricity resistance even to small vital information measuring devices that do not have a large ground, such as wristwatch-type devices. Furthermore, because the main body casing to which static electricity is released is an electrode for electrocardiogram measurement, there is no need to apply high voltages during voltage withstand tests or leakage current tests on the device, and there are no problems passing the voltage withstand tests. Note that static electricity can also be released via the main body casing as the first electrode and then to earth outside the device, but the purpose of this invention is to release static electricity to the metal casing of the vital information measuring device.

the electrocardiogram signal detection circuit is provided on a first substrate that is arranged in the main body housing in a direction parallel to the bottom surface,
The first electrical path and a portion of the second electrical path may be arranged within the main body housing in a direction perpendicular to the bottom surface and provided on a second substrate that is joined to the first electrode by conductive induction tape and is electrically conductive.

This configuration makes it possible to efficiently construct a signal line connecting the first and second electrodes (i.e., a route along which static electricity flows toward the housing) within the limited space inside the main housing.

Furthermore, the first and second boards may be formed integrally as a rigid-flexible board. With this configuration, the electrocardiogram signal detection circuit (first board portion) and the portion that is electrically connected to the first electrode (second board portion) can be arranged in an L-shape within the housing, and the number of parts that make up the device can be reduced.

Furthermore, a display may be provided on the top surface, and the first electrode and the display may be joined together with conductive tape to provide electrical continuity. With this configuration, even if ESD occurs when the display is facing downwards during an ESD test, for example, static electricity will be more likely to flow from the side of the main body housing to the display on the top surface of the main body housing, more effectively preventing static electricity from flowing to electronic components inside the main body housing.

The vital information measuring device may also have a third board arranged parallel to the first board within the main body housing and on which a control device for controlling the vital information measuring device is mounted, and a fourth board arranged at a different position from the second board and perpendicular to the first board, and on which operation buttons protruding from the side surface and a portion of an electrocardiogram signal line connecting the electrocardiogram signal detection circuit and the control device are provided. This configuration allows for more efficient use of the space within the main body housing.

Furthermore, the above configurations and processes can be combined with each other to form the present invention as long as no technical contradictions arise.

The present invention provides technology that can achieve high static electricity resistance in a biometric information measurement device that has a metal housing and is equipped with electrodes.

FIG. 1 is a perspective view showing an outline of a biological information measuring device according to an embodiment of the present invention. FIG. 2 is a side view showing an outline of the biological information measuring device according to the embodiment. FIG. 3 is an external view of the main body of the biological information measuring device according to the embodiment, as viewed from the bottom side. FIG. 4 is a schematic cross-sectional view of the biological information measuring device according to the embodiment as viewed from the side. FIG. 5 is a schematic cross-sectional view of the vicinity of the sensor substrate housing portion of the biological information measuring device according to the embodiment. FIG. 6 is a schematic cross-sectional view illustrating the connection between the electrodes of the biological information measuring device according to the embodiment and the sensor substrate and the bezel conductive substrate. FIG. 7 is a schematic circuit diagram showing signal lines between the electrodes and the electrocardiogram signal detection circuit of the biological information measurement device according to the embodiment. FIG. 8 is a block diagram showing the functional configuration of the biological information measuring device according to the embodiment.

<Embodiment>
Specific embodiments of the present invention will be described below with reference to the drawings. However, unless otherwise specified, the dimensions, materials, shapes, relative positions, and the like of the components described in the following embodiments are not intended to limit the scope of the present invention.

(Overall configuration of the device)
Fig. 1 is an external perspective view showing the outline of the configuration of a biological information measurement device 1 according to this embodiment. Fig. 2 is a side view showing the outline of the configuration of the biological information measurement device 1 according to this embodiment. As shown in Figs. 1 and 2, the biological information measurement device 1 is generally a wristwatch-type wearable device having a main body 10 and a belt 20, and can measure biological information such as an electrocardiogram waveform, a pulse wave (pulse rate), and a blood pressure value when worn on a human wrist.

As shown in Figures 1 and 2, the main body 10 is composed of a main body housing 11 and a cuff cover 16, which will be described later. The main body housing 11 is provided with a display 12 (e.g., an organic EL display), a bezel 131, operation buttons 13a and 13b, lugs 14, etc., as well as a sensor board housing section 15 that houses a sensor board. In this embodiment, the side on which the display 12 is formed is referred to as the surface of the main body housing 11, and the side on which the sensor board housing section 15 is formed is referred to as the bottom of the main body housing 11. In the following, the surface side of the main body housing 11 may be referred to as the upper side, and the bottom side of the main body housing 11 may be referred to as the lower side.

The bezel 131 that forms the side of the main body housing 11 is made of a conductor (e.g., stainless steel) and functions as an electrode (right-hand electrode) for measuring electrocardiogram waveforms. For this reason, hereinafter, when describing the function of the bezel 131 in relation to electrocardiogram waveform measurement, it will also be referred to as the first electrode, etc.

Figure 3 shows an external view of main body unit 10 as viewed from the bottom side. As shown in Figure 3, the bottom of main body housing 11 has a central area covered by resin cover 151 and an area corresponding to the central area covered by cuff cover 16. Resin cover 151 is at least partially formed from a translucent resin, and the inside of main body housing 11 of the area covered by resin cover 151 corresponds to sensor board housing 15. Sensor board housing 15 is located in the central area covered by resin cover 151 of main body housing 11 in a plan view, and is formed so as to protrude further toward the wrist than cuff cover 16 when worn, as shown in Figure 2. In other words, the surface on the bottom side of resin cover 151 is the contact surface that comes into contact with the human body.

Furthermore, second electrode 132 and third electrode 133 are provided on the bottom of main body housing 11 so that their contact surfaces with the human body are exposed. Second electrode 132 functions as a left-hand electrode, and third electrode 133 functions as a GND electrode (an electrode that provides a reference potential for electrocardiogram waveform measurement). When measuring an electrocardiogram waveform, electrocardiogram waveform measurement using lead I is performed by wearing biometric information measurement device 1 and bringing the contact surfaces of second electrode 132 and third electrode 133 into contact with the skin surface of the area where the device is worn, and touching bezel 131 with the fingers of the hand on which the biometric information measurement device 1 is not worn. The detailed structure of second electrode 132 and third electrode 133 will be described later.

In addition, although not shown, a charging terminal is also provided on the bottom of the main body housing 11. By connecting the connection terminal of the power supply device to the charging terminal, the rechargeable battery (not shown in Figure 3) can be charged.

Furthermore, as shown in FIG. 3, from the bottom side of the main body housing 11, the first LED 111, second LED 113, first photodiode (PD) 112, and second PD 121 mounted on the lower surface (mounting surface) of the second sensor board 102 (described later) can each be seen through the translucent portion of the resin cover 151.

The belt unit 20 includes a belt 21 and hook-and-loop fastener 25 for securing the vital information measuring device 1 to the wrist, as well as a first pressure cuff 22 and a second pressure cuff 23 for compressing the artery in the wrist, and a sensing cuff 24 for detecting pressure pulse waves. The connection portions between each of the cuffs 22, 23, and 24 and the main body housing 11 are covered by a cuff cover 16. The cuff cover 16 protects the connection portions between each of the cuffs 22, 23, and 24 and the main body housing 11, and also functions to secure each of the cuffs 22, 23, and 24 to the main body housing 11.

(Internal structure of the housing)
Next, the internal configuration of the main body housing 11 will be described with reference to Figures 4 to 6. Figure 4 is a schematic cross-sectional view corresponding to the X-X cross-section in Figure 3, and Figure 5 is an enlarged view of the vicinity of the sensor substrate housing portion 15 in Figure 4. Figure 6 is a schematic cross-sectional view corresponding to the Y-Y cross-section in Figure 3. Note that Figures 4 to 6 are not accurate cross-sectional views, and the configuration has been appropriately omitted or deformed for ease of explanation.

As shown in FIG. 4, the main body housing 11 houses a rechargeable battery 191, control board 17, piezoelectric pump 161, valve 162, pressure sensor 163, flow path plate 164, etc. Furthermore, a sensor board housing section 15 formed in a convex shape is provided near the bottom of the main body housing 11, and a sensor board set 100 consisting of a first sensor board 101 and a second sensor board 102 is housed in the sensor board housing section 15. Furthermore, a bezel 131 that forms the side of the main body housing 11 is joined to the display 12 that forms the top surface of the main body housing 11 with conductive tape TP.

Furthermore, in part of the bottom of the main body housing 11 where the sensor board housing 15 is not provided in plan view, a first connection portion 165 is provided that connects the main body housing 11 (more specifically, the flow path plate 164 inside the housing) to the first pressure cuff 22 and the sensing cuff 24, and a second connection portion 166 that similarly connects the main body housing 11 to the second pressure cuff 23. The first connection portion 165 and the second connection portion 166 are covered by a cuff cover 16 that is provided in an area on the bottom of the main body that corresponds to the outer periphery of the sensor board housing 15. As already mentioned, the area located at the sensor board housing 15 is covered by a resin cover 151.

The rechargeable battery 191 can be a general-purpose secondary battery such as a lithium-ion battery, and can be repeatedly charged by receiving power via the charging terminal. The piezoelectric pump 161, valve 162, pressure sensor 163, flow path plate 164, first pressure cuff 22, second pressure cuff 23, and sensing cuff 24 are components related to blood pressure measurement.

The flow path plate 164 is a conductive member (metal) and has a flow path formed inside it that sends gas from the piezoelectric pump 161 to each cuff. The flow path plate 164 is electrically connected to the control board 17 via a spring connector 182, and functions as the GND for the entire device (hereinafter also referred to as the device GND). The flow path plate 164 also functions as a shield for the first sensor board 101 against noise generated by internal equipment such as the piezoelectric pump 161.

The control board 17 is equipped with a processor such as a CPU (Central Processing Unit), not shown, and memory such as RAM (Random Access Memory), and is responsible for overall control of the vital information measuring device 1. As described above, the control board 17 is connected to the flow path plate 164 (device GND). However, it is generally difficult to ensure a sufficient GND area in small devices such as wristwatches. If static electricity enters the main body housing 11 due to ESD, static electricity may flow to the control board 17, causing malfunction or damage to electronic components on the circuit. In this regard, the vital information measuring device 1 according to this embodiment has a path for static electricity to escape to the bezel 131 rather than to the device GND, thereby preventing static electricity from flowing to the control board 17 and significantly improving static electricity resistance. Details will be described later.

(Sensor board set)
Next, the sensor board housing portion 15 and the sensor board set 100 will be described. As shown in Fig. 5, the sensor board housing portion 15 is a space that protrudes from the bottom of the main body housing 11 toward the side that comes into contact with the human body. The sensor board set 100, in which a first sensor board 101 and a second sensor board 102 are stacked one above the other, is housed in this space. The first sensor board 101 and the second sensor board 102 are connected by a conductive spring connector 183 and function as a pair.

The second sensor substrate 102 has two light-emitting elements, a first LED 111 and a second LED 113, and two light-receiving elements, a first photodiode (PD) 112 and a second PD 121, provided on the lower surface of the substrate. In this embodiment, the first LED 111 emits green light, and the second LED 113 emits red and/or infrared light in addition to green. In addition, an isolation wall 152 is provided to isolate the first LED 111, the second LED 113, the first PD 112, and the second PD 121 from each other.

Meanwhile, the first sensor board 101 is provided with amplifier circuits that amplify the biosignals acquired by each sensor, and circuits that perform A/D (Analog-to-Digital) conversion. Naturally, it also has an electrocardiogram signal detection circuit 50 implemented to measure electrocardiogram waveforms from signals detected via the bezel 131, second electrode 132, and third electrode 133, but more details on this will be provided later.

In this way, by making the sensor board set 100 a two-tiered stacked structure consisting of the second sensor board 102 and the first sensor board 101, it is possible to significantly reduce the area of the board when viewed from above compared to when all components are mounted on a single board. Note that the first sensor board 101 may also be a double-sided mounted board.

(Configuration of the second electrode and the third electrode)
6, the second electrode 132 and the third electrode 133 are fixed in contact with the lower surface of the first sensor substrate 101. Both electrodes are arranged so that they have portions that protrude from the contact surface TS (the surface located on the dashed line in FIG. 6), which is the surface on the bottom side of the resin cover 151, toward the side that comes into contact with the human body when the device is worn.

Furthermore, an opening (not shown) is provided in the first sensor substrate 101, and electrode pads (not shown) are formed on its outer periphery. As shown in FIG. 6, the second electrode 132 and the third electrode 133 are fixed to the first sensor substrate 101 by being threaded with a male screw member 106 through the opening in the first sensor substrate 101. This fixation is performed with the tip surfaces of the second electrode 132 and the third electrode 133 in contact with the electrode pads formed on the outer periphery of the opening in the first sensor substrate 101, so the second electrode 132 and the third electrode 133 are fixed in a state of electrical continuity with the first sensor substrate 101.

(Substrate adjacent to the inner wall of the bezel)
Furthermore, as shown in FIG. 6 , a bezel conductive substrate 103 is disposed within the main body housing 11. The bezel conductive substrate 103 is connected to the first sensor substrate 101 via a spring connector 184 and is joined to the inner wall of the bezel 131, which serves as the first electrode, via conductive tape TP. The bezel conductive substrate 103 is bent in a generally L-shape and has a horizontal portion 103a that is oriented parallel to the first sensor substrate 101 (i.e., parallel to the bottom surface of the main body housing) and a vertical portion 103b that is oriented perpendicular to the first sensor substrate 101 (along the inner wall of the bezel 131). Note that the terms "parallel,""orthogonal,""horizontal," and "vertical" are used here for convenience to indicate approximate directions, and it is not necessary for each portion to be horizontal or vertical. The bezel conductive substrate 103 can be disposed in a bent state because all or part of it is made of a flexible substrate.

Furthermore, an operation unit board 104 for the operation buttons 13 is arranged within the main body housing 11 along the inner wall of the bezel 131 opposite the vertical portion 103b of the bezel conductive board 103. Each biological signal detected, amplified, and A/D converted by the first sensor board 101 is transmitted to the control board 17 via the operation unit board 104.

(Electrocardiogram signal detection line)
When measuring an electrocardiogram waveform, when a user wears the biological information measurement device 1 on their left wrist and touches the bezel 131 with their right hand, a signal is sent to the electrocardiogram signal detection circuit 50 on the first sensor substrate 101 via the bezel conductive substrate 103. FIG. 7 shows an outline of signal lines between the bezel 131, the second electrode 132, the third electrode 133, and the electrocardiogram signal detection circuit 50. As shown in FIG. 7, the second electrode 132 and the third electrode 133 are connected to the bezel 131 via TVS diodes D1 and D2, respectively. The TVS diodes D1 and D2 may be disposed on the first sensor substrate 101 or on the bezel conductive substrate 103. In FIG. 7, the electrical path connecting the bezel 131 and the electrocardiogram signal detection circuit 50 corresponds to the first electrical path of the present invention, and the electrical path in which the TVS diode D1 is disposed corresponds to the second electrical path of the present invention.

If ESD occurs on the second electrode 132 or third electrode 133, and they are not connected to the bezel 131 via TVS diodes D1 and D2, static electricity will flow into the electrocardiogram signal detection circuit 50 and further into the control board 17 via the signal line on the operation unit board 104. In this regard, as shown in Figure 7, by providing lines connecting the second electrode 132 and third electrode 133 to the bezel 131 via TVS diodes D1 and D2, even if ESD occurs on the second electrode 132 or third electrode 133, (most of) the static electricity will flow to the bezel 131. However, the bezel 131 is the first electrode for electrocardiogram measurement and is not the device's GND.

(Functional configuration of the device)
Next, the functional configuration of the biological information measuring device 1 will be described. Fig. 8 is a block diagram showing the functional configuration of the biological information measuring device 1. As shown in Fig. 8, the biological information measuring device 1 according to this embodiment has the following functional units: a pulse wave measuring unit 110, a blood oxygen saturation (SpO2) measuring unit 120, a blood pressure measuring unit 130, an electrocardiogram waveform measuring unit 140, a display unit 150, an operation unit 160, a communication unit 170, a storage unit 180, and a power supply unit 190. These functional units are realized by the processor of the control board 17 reading and executing programs from memory to control the components of the biological information measuring device 1.

The pulse wave measurement unit 110 is composed of a first LED 111, a second LED 113, and a first PD 112, and measures the pulse wave and calculates the pulse rate using the so-called photoplethysmography method. Specifically, the first LED 111 and the second LED 113 emit green light, and the first PD 112 receives the light reflected inside the living body, thereby detecting the blood flow rate (changes in blood vessel volume) that changes with the heartbeat and measuring the pulse wave.

The SpO2 measurement unit 120 includes a second LED 113 and a second PD 114, and measures blood oxygen saturation from the intensity of the reflected red or infrared light emitted from the second LED 113, which is received by the second PD 114.

The blood pressure measurement unit 130 is composed of a piezoelectric pump 161, a valve 162, a pressure sensor 163, a flow path plate 164, a first pressure cuff 22, a second pressure cuff 23, and a sensing cuff 24, and measures blood pressure using the so-called oscillometric method. Since blood pressure measurement using the oscillometric method is a well-known technique, a detailed explanation will be omitted.

The electrocardiogram waveform measurement unit 140 is composed of the bezel 131, the second electrode 132 and the third electrode 133 provided on the bottom of the main body housing 11, and the electrocardiogram signal detection circuit 50, and measures the electrocardiogram waveform using the so-called I-lead method. Specifically, the electrocardiogram waveform is measured based on the potential difference between the second electrode 132 and the third electrode 133, which are in contact with the wrist of one arm when the device is worn, and the finger of the other hand that is in contact with the bezel 131, which functions as the first electrode.

The display unit 150 includes a display 12 and displays various information such as biometric measurement results and menu screens. The operation unit 160 includes operation buttons 13a and 13b, and accepts user input operations via these. The communication unit 170 includes an antenna (not shown) for wireless communication and communicates information with other electronic devices such as information processing terminals, for example, via BLE communication. Note that a terminal for wired communication may also be provided.

The storage unit 180 includes a main storage device (not shown) such as RAM, and stores various types of information such as application programs and measured biological information. In addition to RAM, it may also include an auxiliary storage device such as flash memory. The power supply unit 190 includes a rechargeable battery 191 and a charging terminal, and functions as a power supply source for each component of the biological information measuring device 1.

(Effects of this embodiment)
As described above, in the biological information measuring device according to this embodiment, the bezel 131 of the main body housing 11 functions as a first electrode and is connected to the second electrode 132 and the third electrode 133 via the bezel conductive substrate 103 and the signal line for electrocardiogram measurement provided on the first sensor substrate 101. Furthermore, TVS diodes D1 and D2 are mounted on the signal line for electrocardiogram measurement as electrostatic discharge protection elements. As a result, even if ESD occurs in the biological information measuring device 1 via the second electrode 132, the third electrode 133, or the like, static electricity can be dissipated to the bezel 131 via the TVS diodes D1 and D2 provided on the signal line for electrocardiogram measurement, through which current flows more easily than toward the device GND. Furthermore, static electricity can also be dissipated to earth outside the device through the display 12, which is connected to the bezel 131 by conductive tape TP.

This makes it possible to provide high static electricity resistance even for small vital sign measurement devices, such as wristwatches, which do not allow for a large device GND. Furthermore, because the bezel 131, from which static electricity is released, is an electrode for electrocardiogram measurement, there is no need to apply a high voltage during voltage resistance testing of the device, and there are no problems passing voltage resistance tests or leakage current tests.

<Others>
The above examples are merely illustrative of the present invention, and the present invention is not limited to the specific embodiments described above. Various modifications and combinations of the present invention are possible within the scope of the technical concept. For example, the biological information measuring device only needs to include electrodes and circuits for measuring electrocardiogram waveforms, and does not necessarily require functions or configurations for acquiring other biological information.

Furthermore, while the above embodiment uses a TVS diode as an example of an electrostatic discharge protection element, other electrostatic discharge protection elements can also be used. Furthermore, the shapes, holding methods, and placement locations of the second electrode 132 and the third electrode 133 are not limited to those in the above embodiment, and any desired shapes, holding methods, and placement locations can be used.

Furthermore, in the above embodiment, almost the entire top surface of the device is configured as the display 12, and the bezel 131 functions as the first electrode, but the device may not have a display on the top surface, and the top surface of the main body housing 11 may also be made of metal (in which case the top surface also functions as the first electrode).

Furthermore, in the above embodiment, the bezel conductive substrate 103 and the first sensor substrate 101 were configured to be electrically connected via a spring connector, but the two substrates may also be configured as an integrated unit. In other words, the horizontal portion 103a of the bezel conductive substrate 103 may also serve as the first sensor substrate 101.

1... Biological information measuring device 10... Main body 11... Main body housing 12... Display 13a, 13b... Operation buttons 14... Lug 15... Sensor board housing 16... Cuff cover 17... Control board 20... Belt part 21... Belt 22... First pressure cuff 23... Second pressure cuff 24... Sensing cuff 25... Hook-and-loop fastener 50... Electrocardiogram signal detection circuit 100... Sensor board set 101... First sensor board 102... Second sensor board 103... Bezel conductive board 106... Screw member 111... First LED
112...1st PD
113...Second LED
121...2nd PD
131...Bezel (first electrode)
132: Second electrode 133: Third electrode 151: Resin cover 152: Isolation wall 161: Piezoelectric pump 162: Valve 163: Pressure sensor 164: Flow path plate 165: First connection part 166: Second connection part 182, 183, 184: Spring connectors 191: Rechargeable battery D1, D2: TVS diode TP: Conductive tape TS: Contact surface

Claims (5)

A biological information measuring device that is worn on a human body, includes at least a first electrode and a second electrode, and is configured to be able to measure an electrocardiogram waveform based on a potential difference between the first electrode and the second electrode,
a main body housing including a side surface formed of a conductive material and functioning as the first electrode, a bottom surface on which the second electrode is disposed and which contacts the human body when worn, and a top surface opposite the bottom surface;
an electrocardiogram signal detection circuit that detects signals related to the potentials of the first electrode and the second electrode;
a first electrical path that connects the first electrode and the electrocardiogram signal detection circuit;
a second electric path on which an electrostatic discharge protection element is mounted and which connects the first electrode and the second electrode via the electrostatic discharge protection element;
A biological information measuring device having the same. the electrocardiogram signal detection circuit is provided on a first substrate that is arranged in the main body housing in a direction parallel to the bottom surface,
The bioinformation measuring device of claim 1, wherein a portion of the first electrical path and the second electrical path are arranged within the main body housing in a direction perpendicular to the bottom surface and are provided on a second substrate that is joined to the first electrode by conductive induction tape and is electrically conductive. The first substrate and the second substrate are integrally formed as a rigid-flexible substrate.
The biological information measuring device according to claim 2 . A display is provided on the top surface,
The first electrode and the display are configured to be electrically connected to a conductive tape.
The biological information measuring device according to claim 1 . a third board disposed in the main body housing in a direction parallel to the first board and on which a control device for controlling the biological information measuring device is mounted;
a fourth board that is provided with an operation button arranged to protrude from the side surface and a part of an electrocardiogram signal line connecting the electrocardiogram signal detection circuit and the control device, and that is arranged in a position different from the second board and in a direction perpendicular to the first board;
The biological information measuring device according to claim 2 .