Biological information measurement device

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

[0001] The present invention relates to a healthcare-related technical field, and more particularly to a biological information measuring device.

[0002] In recent years, it has become common for individuals to measure their own physical and health information (hereinafter referred to as biometric information), such as blood pressure values ​​and electrocardiogram waveforms, on a daily basis using measuring devices and to utilize 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, etc.).

[0003] Patent Literature 1 discloses a wristwatch-type biological information measuring device that is equipped with electrocardiogram electrodes and is 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 unit (display) is placed facing downwards during an ESD (Electrostatic Discharge) test or the like, if the housing is made of metal, static electricity may enter the control board connected to the ground (GND) of the device from the metal housing to which ESD is applied, which could cause malfunction of the control board or damage to components.

[0004] As a 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 housing, a technology for grounding (connecting to GND) the metal housing is known, although it is in a technical field different from electrocardiographs (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.

[0005] JP 2024-14478 A JP 2014-181562 A

[0006] However, if the housing of a device such as an electrocardiograph that 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 ground, which is the metal housing, and the electrocardiogram measurement electrodes).

[0007] In view of the above-mentioned problems, an object of the present invention is to provide a technique that can achieve high static electricity resistance in a biological information measurement device that has a metal housing and is equipped with electrodes.

[0008] In order to solve the above problems, the biological information measuring device according to the present invention employs the following configuration: That is, the biological information measuring device 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, the biological information measuring device having: a main body housing made of a conductive material and including a side surface that functions as the first electrode, a bottom surface on which the second electrode is disposed and that 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 electric path that connects the first electrode and the electrocardiogram signal detection circuit, and a second electric path that has an electrostatic discharge protection element mounted thereon and connects the first electrode and the second electrode via the electrostatic discharge protection element.

[0009] That is, the first electrode and the second electrode are brought into a conductive state via the electrostatic discharge protection element only when a current exceeding a specific frequency / applied voltage is generated due to an electrostatic discharge phenomenon, etc. With this configuration, even if static electricity enters the biological information measurement device via the second electrode, etc., the static electricity can be released to the main body housing as the first electrode via the electrostatic discharge protection element provided on the signal line for electrocardiogram measurement, through which current easily flows.

[0010] This makes it possible to provide high electrostatic resistance to small vital information measurement devices, such as wristwatches, that cannot accommodate a large ground. Furthermore, because the main body housing, to which static electricity is released, is an electrode for electrocardiogram measurement, high voltages do not need to be applied in withstand voltage tests or leakage current tests, and this does not cause any problems when passing the withstand voltage tests. While static electricity can also be released via the main body housing as the first electrode and then to a ground outside the device, the present invention is intended to release static electricity to the metal housing of the vital information measurement device.

[0011] The electrocardiogram signal detection circuit may be provided on a first board arranged within the main body housing in a direction parallel to the bottom surface, and a portion of the first electrical path and the second electrical path may be provided on a second board arranged within the main body housing in a direction perpendicular to the bottom surface and joined to the first electrode by conductive induction tape for electrical conduction.

[0012] With this configuration, it is possible to efficiently construct a signal line connecting the first electrode and the second electrode (i.e., a route along which static electricity flows toward the housing) within the limited space inside the main housing.

[0013] The first and second substrates may be integrally formed as a rigid-flexible substrate, which allows the electrocardiogram signal detection circuit (first substrate portion) and the portion electrically connected to the first electrode (second substrate portion) to be arranged in an L-shape within the housing, and also reduces the number of components constituting the device.

[0014] Furthermore, a display may be provided on the top surface, and the first electrode and the display may be joined together with a conductive tape for electrical continuity. With this configuration, even if ESD occurs when the display is facing downwards during an ESD test or the like, 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, making it possible to more effectively prevent static electricity from flowing to electronic components inside the main body housing.

[0015] The biological information measuring device may further include a fourth board disposed in a position different from the second board and perpendicular to the first board, the fourth board being provided with a third board disposed in the main body housing in a direction parallel to the first board and having a control device for controlling the biological information measuring device mounted thereon, operation buttons disposed so as to protrude from the side surface, and a part of an electrocardiogram signal line connecting the electrocardiogram signal detection circuit and the control device. Such a configuration makes it possible to more efficiently utilize the space within the main body housing.

[0016] The present invention can be achieved by combining the above-described configurations and processes as long as no technical contradiction occurs.

[0017] According to the present invention, it is possible to provide a technique that can achieve high static electricity resistance in a biological information measurement device that has a metal housing and is equipped with electrodes.

[0018] FIG. 1 is an external 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 a biological information measuring device according to an embodiment. FIG. 3 is an external view of a main body of a biological information measuring device according to an embodiment as viewed from the bottom side. FIG. 4 is a schematic cross-sectional view of a biological information measuring device according to an embodiment as viewed from the side. FIG. 5 is a schematic cross-sectional view of the vicinity of a sensor substrate housing unit of a biological information measuring device according to an embodiment. FIG. 6 is a schematic cross-sectional view illustrating connections between electrodes of a biological information measuring device according to an embodiment, a sensor substrate, and a bezel conductive substrate. FIG. 7 is a schematic circuit diagram showing signal lines between electrodes of a biological information measuring device according to an embodiment and an electrocardiogram signal detection circuit. FIG. 8 is a block diagram showing the functional configuration of a biological information measuring device according to an embodiment.

[0019] <Embodiments> 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.

[0020] (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 part 20, and can measure biological information such as an electrocardiogram waveform, pulse wave (pulse rate), and blood pressure value when worn on a human wrist.

[0021] 1 and 2, the main body 10 includes a main body housing 11 and a cuff cover 16 (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 15 for housing a sensor board. In this embodiment, the side on which the display 12 is formed is referred to as the front surface of the main body housing 11, and the side on which the sensor board housing 15 is formed is referred to as the bottom surface of the main body housing 11. In the following description, the front 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.

[0022] Bezel 131, which forms the side of 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, bezel 131 will also be referred to as the first electrode when describing its function related to electrocardiogram waveform measurement.

[0023] FIG. 3 shows an external view of main body 10 as viewed from the bottom side. As shown in FIG. 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 of a translucent resin, and the interior side 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 of ​​main body housing 11 covered by resin cover 151 in a plan view, and is formed to protrude further toward the wrist than cuff cover 16 when worn, as shown in FIG. 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.

[0024] Additionally, a second electrode 132 and a third electrode 133 are provided on the bottom of the main body housing 11 so that their surfaces that come into contact with the human body are exposed. The second electrode 132 functions as a left-hand electrode, and the third electrode 133 functions as a GND electrode (an electrode that provides a reference potential for electrocardiogram waveform measurement). When measuring an electrocardiogram waveform, the biometric information measurement device 1 is worn, and the contact surfaces of the second electrode 132 and the third electrode 133 are brought into contact with the skin surface of the area where the biometric information measurement device 1 is worn, and the bezel 131 is touched with the fingers of the hand on the side not wearing the biometric information measurement device 1, thereby enabling electrocardiogram waveform measurement using lead I. The detailed structures of the second electrode 132 and the third electrode 133 will be described later.

[0025] 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 side device to the charging terminal, it is possible to charge a rechargeable battery (not shown in FIG. 3).

[0026] As shown in FIG. 3, from the bottom side of the main body housing 11, the first LED 111, the second LED 113, the first photodiode (PD) 112, and the 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.

[0027] The belt unit 20 includes a belt 21 and a hook-and-loop fastener 25 for fastening the vital sign measuring device 1 to the wrist, a first pressure cuff 22 and a second pressure cuff 23 for compressing an artery in the wrist, and a sensing cuff 24 for detecting a pressure pulse wave. The connection portions between 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 the cuffs 22, 23, and 24 and the main body housing 11, and also functions to fasten the cuffs 22, 23, and 24 to the main body housing 11.

[0028] (Internal Structure of Housing) Next, the internal structure 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 structure has been omitted or deformed as appropriate for the sake of convenience.

[0029] 4, the main body housing 11 accommodates a rechargeable battery 191, a control board 17, a piezoelectric pump 161, a valve 162, a pressure sensor 163, a flow path plate 164, etc. A sensor board accommodation 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 accommodated in the sensor board accommodation section 15. A bezel 131 that forms the side surface 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.

[0030] Furthermore, in a part of the bottom of main body housing 11 where sensor board housing 15 is not provided in plan view, a first connection part 165 that connects main body housing 11 (more specifically, flow path plate 164 inside the housing) to first pressure cuff 22 and sensing cuff 24, and a second connection part 166 that similarly connects main body housing 11 to second pressure cuff 23, are provided. First connection part 165 and second connection part 166 are covered by cuff cover 16 that is provided in an area of ​​the main body bottom that corresponds to the outer periphery of sensor board housing 15. As already mentioned, the area located at sensor board housing 15 is covered with resin cover 151.

[0031] 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 a charging terminal. The piezoelectric pump 161, the valve 162, the pressure sensor 163, the flow path plate 164, the first pressure cuff 22, the second pressure cuff 23, and the sensing cuff 24 are components related to blood pressure measurement.

[0032] The flow path plate 164 is a conductive member (metal) and has a flow path formed therein 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 of 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 devices such as the piezoelectric pump 161.

[0033] The control board 17 is equipped with a processor such as a central processing unit (CPU) (not shown), a memory such as a random access memory (RAM), and other components, and controls the entire vital information measurement 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 measurement device 1 according to this embodiment has a path for dissipating static electricity 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.

[0034] (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 in two layers, 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.

[0035] The second sensor substrate 102 has, on its lower surface, 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. 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. 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.

[0036] On the other hand, the first sensor substrate 101 is provided with an amplifier circuit that amplifies the biological signals acquired by each sensor, an A / D (Analog-to-Digital) conversion circuit, etc. Naturally, an electrocardiogram signal detection circuit 50 for measuring an electrocardiogram waveform from signals detected via the bezel 131, the second electrode 132, and the third electrode 133 is also mounted, but details of this will be described later.

[0037] In this way, by forming the sensor board set 100 into a two-tiered 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 be a double-sided mounted board.

[0038] 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.

[0039] An opening (not shown) is provided in the first sensor substrate 101, and electrode pads (not shown) are formed on the outer periphery of the opening. The second electrode 132 and the third electrode 133 are fixed to the first sensor substrate 101 by being threadedly engaged with male screw members 106 through the openings in the first sensor substrate 101, as shown in Fig. 6. This fixing 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 openings in the first sensor substrate 101, so that the second electrode 132 and the third electrode 133 are fixed in a state of electrical continuity with the first sensor substrate 101.

[0040] (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.

[0041] An operation unit board 104 for the operation buttons 13 is disposed within the main body housing 11 along the inner wall of the bezel 131 that faces the vertical portion 103b of the bezel conductive board 103. The biological signals detected, amplified, and A / D converted by the first sensor board 101 are transmitted to the control board 17 via the operation unit board 104.

[0042] (Electrocardiographic Signal Detection Line) When measuring an electrocardiographic waveform, if a user touches the bezel 131 with their right hand while wearing the biological information measurement device 1 on their left wrist, a signal is sent to the electrocardiographic signal detection circuit 50 on the first sensor substrate 101 via the bezel conductive substrate 103. FIG. 7 shows an outline of the signal lines between the bezel 131, the second electrode 132, the third electrode 133, and the electrocardiographic 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 electrocardiographic 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.

[0043] If ESD occurs on the second electrode 132 or the third electrode 133, and the second electrode 132 or the third electrode 133 is not connected to the bezel 131 via the 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 or the third electrode 133 to the bezel 131 via the TVS diodes D1 and D2, even if ESD occurs on the second electrode 132 or the 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 GND of the device.

[0044] (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.

[0045] The pulse wave measurement unit 110 includes a first LED 111, a second LED 113, and a first PD 112, and measures the pulse wave and calculates the pulse rate by photoplethysmography. Specifically, the first LED 111 and the second LED 113 emit green light, and the first PD 112 receives the light reflected from inside the living body, thereby detecting the blood flow rate (change in blood vessel volume) that changes with the heartbeat and measuring the pulse wave.

[0046] 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 light by receiving the red light or infrared light emitted from the second LED 113 with the second PD 114.

[0047] The blood pressure measurement unit 130 includes 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 by a so-called oscillometric method. Blood pressure measurement by the oscillometric method is a well-known technique, so a detailed description thereof will be omitted.

[0048] The electrocardiogram waveform measurement unit 140 is configured to include the bezel 131, a second electrode 132 and a third electrode 133 provided on the bottom of the main body housing 11, and an electrocardiogram signal detection circuit 50, and measures the electrocardiogram waveform using a 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 that contact the wrist of one arm when the device is worn, and the finger of the other hand that touches the bezel 131, which functions as the first electrode.

[0049] The display unit 150 includes a display 12 and displays various information such as measurement results of biological information and menu screens. The operation unit 160 includes operation buttons 13a and 13b and accepts input operations from the user 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 via, for example, BLE communication. Note that a terminal for wired communication may also be provided.

[0050] 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, the storage unit 180 may also include an auxiliary storage device such as a 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 measurement device 1.

[0051] Effect of the Present Embodiment As described above, in the biological information measuring device according to the present 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 serving as electrostatic discharge protection elements are mounted on the signal line for electrocardiogram measurement. 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.

[0052] This makes it possible to provide high static electricity resistance even to small vital sign measurement devices such as wristwatches that cannot have 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 in a voltage resistance test for the device, and no problems arise when passing voltage resistance tests or leakage current tests.

[0053] <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 functions and configurations for acquiring other biological information are not necessarily required.

[0054] In addition, although the above embodiment has exemplified a TVS diode as an electrostatic discharge protection element, other electrostatic discharge protection elements may also be employed. Furthermore, the shapes, holding methods, and locations of the second electrode 132 and the third electrode 133 are not limited to those of the above embodiment, and any desired shapes, holding methods, and locations may be employed.

[0055] 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 formed of metal (in which case the top surface also functions as the first electrode).

[0056] In the above embodiment, the bezel conductive substrate 103 and the first sensor substrate 101 are electrically connected via a spring connector, but the two substrates may be integrated. That is, the horizontal portion 103a of the bezel conductive substrate 103 may also serve as the first sensor substrate 101.

[0057] DESCRIPTION OF SYMBOLS 1: Biological information measuring device 10: Main body 11: Main body housing 12: Display 13a, 13b: Operation buttons 14: Lug 15: Sensor board accommodating section 16: Cuff cover 17: Control board 20: Belt section 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: First PD 113: Second LED 121: Second 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 portion 166: Second connection portion 182, 183, 184: Spring connectors 191: Rechargeable battery D1, D2: TVS diode TP: Conductive tape TS: Contact surface

Claims

1. A biological information measuring device that is worn on a human body, has at least a first electrode and a second electrode, and is configured to be able to measure electrocardiogram waveforms based on the potential difference between the first electrode and the second electrode, the biological information measuring device comprising: a main body housing that is made of a conductive material and has a side that functions as the first electrode, a bottom surface on which the second electrode is disposed and that comes into contact with the human body when worn, and a top surface that faces the bottom surface; an electrocardiogram signal detection circuit that detects signals related to the potential of the first electrode and the second electrode; a first electric path that connects the first electrode and the electrocardiogram signal detection circuit; and a second electric path that is equipped with an electrostatic discharge protection element and connects the first electrode and the second electrode via the electrostatic discharge protection element.

2. The bioinformation measuring device according to claim 1, wherein the electrocardiogram signal detection circuit is provided on a first substrate arranged within the main body housing in a direction parallel to the bottom surface, and the first electrical path and a portion of the second electrical path are provided on a second substrate arranged within the main body housing in a direction perpendicular to the bottom surface and joined to the first electrode with conductive inductive tape for electrical continuity.

3. The biological information measuring device according to claim 2, wherein the first substrate and the second substrate are integrally formed as a rigid-flexible substrate.

4. The biological information measuring device according to claim 1, wherein a display is provided on the top surface, and the first electrode and the display are configured to be electrically connected via a conductive tape.

5. A biometric information measuring device as described in claim 2, further comprising: a third board arranged in the main body housing in a direction parallel to the first board, on which a control device for controlling the biometric information measuring device is mounted; and a fourth board on which operation buttons are arranged to protrude from the side surface and part of an electrocardiogram signal line connecting the electrocardiogram signal detection circuit and the control device are provided, the fourth board being arranged in a position different from the second board and in a direction perpendicular to the first board.

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