WO2021192142A1

WO2021192142A1 - Pulse wave detection device

Info

Publication number: WO2021192142A1
Application number: PCT/JP2020/013676
Authority: WO
Inventors: 渋谷隆夫; 茂木孝之; 松田勲
Original assignee: 太陽誘電株式会社
Priority date: 2020-03-26
Filing date: 2020-03-26
Publication date: 2021-09-30

Abstract

A pulse wave detection device (1-1C) is provided with: a vibration sensor (21) for detecting a pulse wave signal from the radial artery of a wrist (10); a communication unit (22) for performing wireless communication of the pulse wave signal with an external device; a power supply unit (23) for supplying electric power to the vibration sensor and the communication unit; and a band (2) which has a first storage unit (210) for storing the vibration sensor, a second storage unit (220) for storing the communication unit, a third storage unit (230) for storing the power supply unit, and connection units (81, 82) for connecting at least two of the first storage unit, the second storage unit, and the third storage unit, and is fixed to the wrist. When the band is fixed to the wrist such that the first storage unit is placed at a position facing the radial artery (13) of the wrist, at least one of the second storage unit and the third storage unit is placed to face a region (14A or 15A) between the radius and the ulna on the dorsal side or the ventral side of the wrist.

Description

Pulse wave detector

The present invention relates to a pulse wave detection device.

In recent years, a vibration sensor having a piezoelectric element for detecting a pulse wave of a human body and a pulse wave detecting device having the vibration sensor attached to a band wrapped around a finger or a wrist have been known. This vibration sensor includes a substrate, a piezoelectric element arranged on the substrate, and a tubular member or a conductive spacer arranged on the substrate so as to surround the piezoelectric element and directly pressed against the human body (). For example, see Patent Documents 1 and 2).

International Publication No. 2013/145352 International Publication No. 2017/187710

For example, when the pulse wave detection device is wrapped around the wrist, a component for outputting the pulse wave signal detected by the vibration sensor to an external device is required. Therefore, the band is provided with parts other than the vibration sensor.

However, if a part other than the vibration sensor comes into contact with a region with a large wrist curvature, an external force is applied to the part from the region with a large wrist curvature, and the part may be damaged.

The present invention has been made in view of the above problems, and provides a pulse wave detection device capable of accurately detecting a pulse wave of a wrist and avoiding damage to parts such as a communication unit or a power supply unit. The purpose is.

The present invention includes a sensor that detects a pulse wave signal from the radial artery of the wrist, a communication unit that wirelessly communicates the pulse wave signal to an external device, a power supply unit that supplies power to the sensor and the communication unit, and the above. A first accommodating unit accommodating a sensor, a second accommodating unit accommodating the communication unit, a third accommodating unit accommodating the power supply unit, and the first accommodating unit, the second accommodating unit, and the third accommodating unit. A band having at least two connecting portions and fixing to the wrist is provided, and the band is fixed to the wrist so that the first accommodating portion is arranged at a position facing the radial artery of the wrist. In the pulse wave detection device, at least one of the second accommodating portion and the third accommodating portion is arranged so as to face the region between the radius and the ulnar bone on the dorsal or ventral side of the wrist. be.

In the above configuration, the power supply unit may be arranged between the sensor and the communication unit.

In the above configuration, the second accommodating portion may be arranged between the wrist and the communication portion and may include a first reinforcing member having a elastic modulus larger than that of the band.

In the above configuration, the third accommodating portion may be arranged between the wrist and the power supply portion, and may include a second reinforcing member having a elastic modulus larger than that of the band.

In the above configuration, the connecting portion is formed between the first accommodating portion, the second accommodating portion, and the third accommodating portion, and the first accommodating portion, the second accommodating portion, and the third accommodating portion. A first connecting portion thinner than the thickness of the second accommodating portion and a second connecting portion formed between the second accommodating portion and the third accommodating portion and thinner than the thickness of the second accommodating portion and the third accommodating portion. Can be configured to include.

In the above configuration, the connecting portion is formed between the first accommodating portion, the second accommodating portion, and the third accommodating portion, and the first accommodating portion, the second accommodating portion, and the third accommodating portion. The first connecting portion, which is thinner than the thickness of the above, may be provided, and the second accommodating portion and the third accommodating portion may be integrated without being separated.

In the above configuration, the band is a band-shaped band, includes a first locking portion and a second locking portion that locks the first locking portion, and the sensor is the communication unit and the power supply. It can be configured to be arranged at a position closer to the second locking portion than the portion.

In the above configuration, the band locks a first band member having a first attachment portion and a first locking portion to the watch, and a second attachment portion to the watch and the first locking portion. A second band member having two locking portions is provided, and the sensor, the power supply unit, and the communication unit are arranged in the first band member, and the sensor is more than the communication unit and the power supply unit. 1 It can be configured to be arranged at a position close to the locking portion.

In the above configuration, the band locks the first band member having the first attachment portion to the watch and the first locking portion, and the second attachment portion to the watch and the first locking portion. A second band member having a second locking portion is provided, and the sensor, the power supply unit, and the communication unit are arranged in the second band member, and the sensor is more than the communication unit and the power supply unit. It can be configured to be arranged at a position close to the second mounting portion.

In the above configuration, the sensor has a second substrate having a first surface and a second surface on the opposite side of the first surface, and a protrusion fixed to the first surface at substantially the center of the second substrate. The shape member, the piezoelectric element fixed in the second region of the second surface facing the first region on the first surface to which the convex member is fixed, and the first one to which the piezoelectric element is fixed. A case is provided which covers two surfaces, faces the piezoelectric element through a space, and supports two opposing sides of the second surface of the second substrate, and the space is provided with a case based on the elastic modulus of the case. It can also be configured to be filled with a material having a low elastic modulus.

In the above configuration, the sensor is formed on one of an insulating portion provided on two opposing sides of the second surface of the second substrate and an inner wall, an inner wall, or an outer wall of the case, and the insulating portion and the insulating portion. It can be configured to include a conductive material that is electrically connected.

In the above configuration, the band may be formed of either rubber, urethane or silicon.

According to the present invention, the pulse wave of the wrist can be accurately detected, and damage to parts such as the communication unit or the power supply unit can be avoided.

FIG. 1A is a diagram showing a configuration of a pulse wave detection device according to the present embodiment. FIG. 1B is a diagram showing a state in which the pulse wave detection device of FIG. 1A is wrapped around the wrist. FIG. 2A is a diagram showing a configuration of a first modification of the pulse wave detection device. FIG. 2B is a diagram showing a state in which the pulse wave detection device of FIG. 2A is wrapped around the wrist. FIG. 3A is a diagram showing a configuration of a second modification of the pulse wave detection device. FIG. 3B is a diagram showing a state in which the pulse wave detection device of FIG. 3A is wrapped around the wrist. FIG. 4A is a diagram showing a configuration of a third modification of the pulse wave detection device. FIG. 4B is a diagram showing a state in which the pulse wave detection device of FIG. 4A is wrapped around the wrist. FIG. 5A is a cross-sectional view showing the configuration of the vibration sensor. 5 (b) and 5 (c) are cross-sectional views of a case included in the vibration sensor. FIG. 6 is a plan view showing the configuration of the vibration sensor. 7 (a) to 7 (d) are diagrams showing an example of a case. FIG. 8 is a block diagram showing the configurations of the vibration sensor, the signal processing / communication unit, and the power supply unit. FIG. 9A is a cross-sectional view of the first accommodating portion to the third accommodating portion of the band. FIG. 9B is a cross-sectional view showing a first modification of the first accommodating portion to the third accommodating portion. FIG. 10A is a cross-sectional view showing a second modification of the first accommodating portion to the third accommodating portion. FIG. 10B is a cross-sectional view showing a third modified example of the first accommodating portion to the third accommodating portion.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1A is a diagram showing a configuration of a pulse wave detection device according to the present embodiment. FIG. 1B is a diagram showing a state in which the pulse wave detection device of FIG. 1A is wrapped around the wrist. FIG. 2A is a diagram showing a configuration of a first modification of the pulse wave detection device. FIG. 2B is a diagram showing a state in which the pulse wave detection device of FIG. 2A is wrapped around the wrist. FIG. 3A is a diagram showing a configuration of a second modification of the pulse wave detection device. FIG. 3B is a diagram showing a state in which the pulse wave detection device of FIG. 3A is wrapped around the wrist. FIG. 4A is a diagram showing a configuration of a third modification of the pulse wave detection device. FIG. 4B is a diagram showing a state in which the pulse wave detection device of FIG. 4A is wrapped around the wrist.

As shown in FIG. 1A, the pulse wave detection device 1 according to the present embodiment is, for example, a single tape-shaped band that can be wrapped around the wrist. The pulse wave detection device 1 includes a band 2, a pin buckle (first locking portion) 3 formed at one end of the band 2, and a plurality of pin buckles 3 formed at the other end of the band 2 into which a pin of the pin buckle 3 can be inserted. It is provided with a through hole (second locking portion) 4 of the above. The band 2 is made of rubber or a resin such as silicon or urethane, and the elastic modulus of the band 2 is, for example, 0.1 to 3000 Mpa. Since the band 2 is made of a flexible material, it easily fits on the wrist.

In the present embodiment, the pin buckle 3 and the through hole 4 function as locking portions. Since the band 2 only needs to have a member that locks one end of the band 2 with the other end, it is a magic tape (registered trademark) or another locking portion used for a watch band other than the pin buckle 3 and the through hole 4. Can be adopted. Further, the band 2 may be a band having a ring shape and a width like a rubber band having no locking portion.

The band 2 includes a vibration sensor 21 that detects a pulse wave signal from the radial artery, a signal processing / communication unit 22 that performs signal processing on the pulse wave signal and transmits the signal-processed pulse wave signal to an external device, and vibration. It includes a sensor 21 and a power supply unit 23 that supplies power to the signal processing / communication unit 22. The signal line 71, the power line 72, and the ground (GND) line 73 are directly connected between the vibration sensor 21 and the signal processing / communication unit 22. Further, the power line 72 and the ground (GND) line 73 are directly connected between the signal processing / communication unit 22 and the power supply unit 23.

Therefore, when the vibration sensor 21, the signal processing / communication unit 22, and the power supply unit 23 are mounted on the printed circuit boards, the printed circuit boards are hard, but the vibration sensor 21, the signal processing / communication unit 22, and the power supply unit 23 are among the vibration sensor 21, the signal processing / communication unit 22, and the power supply unit 23. Band 2 is flexible by having at least one connecting portion that connects the two. Therefore, the fit of the pulse wave detection device 1 to the wrist is improved. Moreover, since the connecting portion has flexibility, the flexibility is increased while maintaining the flatness of the substrate, and the reliability of the module having the printed circuit board can be maintained. The details will be described later.

The total length L1 of the band 2 is, for example, 150 to 250 mm. The length L2 from the end of the pin buckle 3 to the center of the signal processing / communication unit 22 is, for example, 10 to 110 mm. The length L3 from the center of the signal processing / communication unit 22 to the center of the power supply unit 23 is, for example, 20 to 100 mm. The length L4 from the center of the power supply unit 23 to the center of the vibration sensor 21 is, for example, 30 to 80 mm.

The band 2 includes a first accommodating unit 210 accommodating the vibration sensor 21, a second accommodating unit 220 accommodating the signal processing / communication unit 22, and a third accommodating unit 230 accommodating the power supply unit 23. Further, the band 2 includes a first connecting portion 81 and a second connecting portion 82. The positions and thicknesses of the first to third accommodating portions and the first to second connecting portions will be described below.

The first connecting portion 81 is formed between the first accommodating portion 210, the second accommodating portion 220, and the third accommodating portion 230, and the thickness of the first accommodating portion 210, the second accommodating portion 220, and the third accommodating portion 230. Thinner than. The second connecting portion 82 is formed between the second accommodating portion 220 and the third accommodating portion 230, and is thinner than the thickness of the second accommodating portion 220 and the third accommodating portion 230. The thickness of the first accommodating portion 210 to the third accommodating portion 230 is, for example, 1 to 15 mm, and the thickness of the first connecting portion 81 and the second accommodating portion 82 is, for example, 0.5 to 5 mm. The signal line 71, the power line 72, and the ground (GND) line 73 pass through the first connecting portion 81 and the second connecting portion 82. The convex member 38 of the vibration sensor 21 protrudes and is exposed from the surface of the band 2, but the other parts of the vibration sensor 21, the signal processing / communication unit 22 and the power supply unit 23 are embedded inside the band 2. .. Since the first connecting portion 81 and the second connecting portion 82 are made of a material thinner and more flexible than the thickness of the first accommodating portion 210, the second accommodating portion 220 and the third accommodating portion 230, the band 2 is attached to the wrist 10. When mounted, the first connecting portion 81 and the second connecting portion 82 are easily bent.

The vibration sensor 21, the signal processing / communication unit 22, and the power supply unit 23 are arranged in the band 2 in the order of the signal processing / communication unit 22, the power supply unit 23, and the vibration sensor 21 along the direction from the pin buckle 3 to the through hole 4. Has been done. The vibration sensor 21 is arranged at a position on the band 2 closer to the through hole 4 than the signal processing / communication unit 22 and the power supply unit 23.

FIG. 1B is a cross-sectional view of the band 2 of FIG. 1A wound around the left wrist 10. FIG. 1B shows a state viewed from the fingertip side. The wrist 10 includes a radius 11, an ulna 12, a radial artery 13, a palmaris longus muscle 14, and an extensor digitorum muscle 15. The upper side of FIG. 1 (b) is the back side of the hand or the dorsal side of the wrist, and the lower side of FIG. 1 (b) is the palm side or the ventral side of the wrist.

As shown in FIG. 1 (b), when the band 2 is wound around the wrist 10 so that the first accommodating portion 210 and the vibration sensor 21 are arranged at positions facing the radial artery 13 of the wrist 10, the third accommodating portion is formed. The 230 and the power supply unit 23 are arranged so as to face the extensor digitorum muscle 15 of the wrist 10. In this way, since the power supply unit 23 is arranged in the region where the dorsal side of the wrist is relatively less curved, that is, the region 15A facing the extensor digitorum muscle 15, damage to the power supply unit 23 can be prevented. In the following description, the region 15A facing the extensor digitorum muscle 15 corresponds to the region between the radius 11 and the ulna 12 on the dorsal side of the wrist, and the region 14A facing the palmaris longus 14 is the ventral side of the wrist. Corresponds to the area between the radius 11 and the ulna 12.

The pulse wave detection device 1A of FIG. 2A is different from the pulse wave detection device 1 of FIG. 1A in the positions of the vibration sensor 21, the signal processing / communication unit 22, and the power supply unit 23. Other configurations of the pulse wave detection device 1A are the same as the corresponding configurations of the pulse wave detection device 1.

The length L6 from the end of the pin buckle 3 to the center of the signal processing / communication unit 22 is, for example, 40 to 120 mm. The length L7 from the center of the signal processing / communication unit 22 to the center of the power supply unit 23 is, for example, 10 to 50 mm. The length L8 from the center of the power supply unit 23 to the center of the vibration sensor 21 is, for example, 10 to 50 mm.

FIG. 2B is a cross-sectional view of the band 2 of FIG. 2A wound around the left wrist 10. FIG. 2B shows a state viewed from the fingertip side. The upper side of FIG. 2B is the back side of the hand or the dorsal side of the wrist, and the lower side of FIG. 2B is the palm side or the ventral side of the wrist.

As shown in FIG. 2B, when the band 2 is wound around the wrist 10 so that the first accommodating portion 210 and the vibration sensor 21 are arranged at positions facing the radial artery 13 of the subject, the third accommodating portion 210 and the vibration sensor 21 are arranged. The portion 230 and the power supply portion 23 are arranged so as to face the palmaris longus muscle 14 of the wrist 10. In this way, since the power supply unit 23 is arranged in the region where the curvature of the ventral side of the wrist is relatively small, that is, the region 14A facing the palmaris longus muscle 14, damage to the power supply unit 23 can be prevented.

Note that, in FIGS. 1 (a) and 2 (a), the positions of the third accommodating unit 230 and the power supply unit 23 may be exchanged with the positions of the second accommodating unit 220 and the signal processing / communication unit 22. In this case, when the band 2 is wound around the wrist 10 so that the first accommodating portion 210 and the vibration sensor 21 are arranged at positions facing the radial artery 13 of the subject, the second accommodating portion 220 and signal processing / communication are performed. The portion 22 is arranged so as to face either the palmaris longus muscle 14 or the extensor digitorum muscle 15 of the wrist 10. Therefore, since the signal processing / communication unit 22 is arranged in the

area

14A or 15A, damage to the signal processing / communication unit 22 can be prevented.

In the pulse wave detection device 1B of FIG. 3A and the pulse wave detection device 1C of FIG. 4A, band 2 is a watch band, and a watch 5 is provided in the middle of the band 2. Note that, in FIGS. 3A and 4A, the back side of the watch 5 (that is, the back side of the dial) is shown. The band 2 has a first band member 2A having a pin buckle 3 and a first attachment portion 6 to the watch 5, a second band member 2A having a through hole 4 for locking the pin buckle 3 and a second attachment portion 7 to the watch 5. It includes a band member 2B. The first band member 2A and the second band member 2B are made of rubber or a resin such as urethane or silicon, and the elastic modulus of the band 2 is, for example, 0.1 to 3000 Mpa.

In FIG. 3A, the first band member 2A includes a vibration sensor 21, a signal processing / communication unit 22, and a power supply unit 23. Further, the first band member 2A includes a first accommodating unit 210 accommodating the vibration sensor 21, a second accommodating unit 220 accommodating the signal processing / communication unit 22, and a third accommodating unit 230 accommodating the power supply unit 23. There is. Furthermore, the first band member 2A includes a first connecting portion 81 and a second connecting portion 82. The positions and thicknesses of the first to third accommodating portions and the first to second connecting portions will be described below.

The first connecting portion 81 is formed between the first accommodating portion 210, the second accommodating portion 220, and the third accommodating portion 230, and the thickness of the first accommodating portion 210, the second accommodating portion 220, and the third accommodating portion 230. Thinner than. The second connecting portion 82 is formed between the second accommodating portion 220 and the third accommodating portion 230, and is thinner than the thickness of the second accommodating portion 220 and the third accommodating portion 230. The thickness of the first accommodating portion 210 to the third accommodating portion 230 is, for example, 1 to 15 mm, and the thickness of the first connecting portion 81 and the second accommodating portion 82 is, for example, 0.5 to 5 mm. A signal line 71, a power line 72, and a ground (GND) line 73 are connected between the vibration sensor 21 and the signal processing / communication unit 22. A power line 72 and a ground (GND) line 73 are connected between the signal processing / communication unit 22 and the power supply unit 23. Therefore, the signal line 71, the power line 72, and the ground (GND) line 73 pass through the first connecting portion 81 and the second connecting portion 82. The convex member 38 of the vibration sensor 21 protrudes and is exposed from the surface of the band 2, but the other parts of the vibration sensor 21, the signal processing / communication unit 22 and the power supply unit 23 are embedded inside the first band member 2A. It has been.

In FIG. 3A, the first band member 2A is longer than the second band member 2B. The total length L10 of the first band member 2A is, for example, 80 to 160 mm. The total length L11 of the second band member 2B is, for example, 40 to 90 mm. The length L12 from the end of the pin buckle 3 to the center of the vibration sensor 21 is, for example, 10 to 50 mm. The length L13 from the center of the vibration sensor 21 to the center of the power supply unit 23 is, for example, 10 to 50 mm. The length L14 from the center of the power supply unit 23 to the center of the signal processing / communication unit 22 is, for example, 10 to 50 mm.

The vibration sensor 21, the signal processing / communication unit 22, and the power supply unit 23 are first arranged in the order of the vibration sensor 21, the power supply unit 23, and the signal processing / communication unit 22 along the direction from the pin buckle 3 to the first mounting unit 6. It is arranged on the band member 2A. The vibration sensor 21 is arranged at a position closer to the pin buckle 3 than the power supply unit 23 and the signal processing / communication unit 22.

FIG. 3B is a cross-sectional view of the band 2 of FIG. 3A wound around the left wrist 10. FIG. 3B shows a state viewed from the fingertip side. The upper side of FIG. 3B is the back side of the hand or the dorsal side of the wrist, and the lower side of FIG. 3B is the palm side or the ventral side of the wrist.

As shown in FIG. 3B, when the band 2 is wound around the wrist 10 so that the first accommodating portion 210 and the vibration sensor 21 are arranged at positions facing the radial artery 13 of the wrist 10, the third accommodating portion is formed. The 230 and the power supply unit 23 are arranged so as to face the palmaris longus muscle 14 of the wrist 10. In this way, since the power supply unit 23 is arranged in the region where the curvature of the ventral side of the wrist is relatively small, that is, the region 14A, the warpage of the power supply unit 23 can be suppressed and the power supply unit 23 can be prevented from being damaged. This is particularly effective when the power supply unit 23 is damaged and an excessive current may flow.

In FIG. 4A, the second band member 2B includes a vibration sensor 21, a signal processing / communication unit 22, and a power supply unit 23. Further, the second band member 2B includes a first accommodating unit 210 accommodating the vibration sensor 21, a second accommodating unit 220 accommodating the signal processing / communication unit 22, and a third accommodating unit 230 accommodating the power supply unit 23. There is. Further, the second band member 2B includes a first connecting portion 81 and a second connecting portion 82. The positions and thicknesses of the first to third accommodating portions and the first to second connecting portions will be described below.

The first connecting portion 81 is formed between the first accommodating portion 210, the second accommodating portion 220, and the third accommodating portion 230, and the thickness of the first accommodating portion 210, the second accommodating portion 220, and the third accommodating portion 230. Thinner than. The second connecting portion 82 is formed between the second accommodating portion 220 and the third accommodating portion 230, and is thinner than the thickness of the second accommodating portion 220 and the third accommodating portion 230. The thickness of the first accommodating portion 210 to the third accommodating portion 230 is, for example, 1 to 15 mm, and the thickness of the first connecting portion 81 and the second accommodating portion 82 is, for example, 0.5 to 5 mm. A signal line 71, a power line 72, and a ground (GND) line 73 are connected between the vibration sensor 21 and the signal processing / communication unit 22. A power line 72 and a ground (GND) line 73 are connected between the signal processing / communication unit 22 and the power supply unit 23. Therefore, the signal line 71, the power line 72, and the ground (GND) line 73 pass through the first connecting portion 81 and the second connecting portion 82. The convex member 38 of the vibration sensor 21 protrudes and is exposed from the surface of the band 2, but the other parts of the vibration sensor 21, the signal processing / communication unit 22 and the power supply unit 23 are embedded inside the second band member 2B. It has been.

In FIG. 4A, the second band member 2B is longer than the first band member 2A. The total length L15 of the first band member 2A is, for example, 60 to 110 mm. The total length L16 of the second band member 2B is, for example, 80 to 130 mm. The length L17 from the second mounting portion 7 to the center of the vibration sensor 21 is, for example, 20 to 60 mm. The length L18 from the center of the vibration sensor 21 to the center of the power supply unit 23 is, for example, 10 to 50 mm. The length L19 from the center of the power supply unit 23 to the center of the signal processing / communication unit 22 is, for example, 10 to 50 mm.

The vibration sensor 21, the signal processing / communication unit 22, and the power supply unit 23 are second in the order of the vibration sensor 21, the power supply unit 23, and the signal processing / communication unit 22 along the direction from the second mounting unit 7 toward the through hole 4. It is arranged on the band member 2B. The vibration sensor 21 is arranged at a position closer to the second mounting portion 7 than the signal processing / communication unit 22 and the power supply unit 23.

FIG. 4B is a cross-sectional view of the band 2 of FIG. 4A wound around the left wrist 10. FIG. 4B shows a state viewed from the fingertip side. The upper side of FIG. 4B is the back side of the hand or the dorsal side of the wrist, and the lower side of FIG. 4B is the palm side or the ventral side of the wrist.

As shown in FIG. 4B, when the band 2 is wound around the wrist 10 so that the first accommodating portion 210 and the vibration sensor 21 are arranged at positions facing the radial artery 13 of the wrist 10, the third accommodating portion is formed. The 230 and the power supply unit 23 are arranged so as to face the palmaris longus muscle 14 of the wrist 10. In this way, since the power supply unit 23 is arranged in the region where the curvature of the ventral side of the wrist is relatively small, that is, the region 14A, the curvature of the power supply unit 23 can be suppressed and the power supply unit 23 can be prevented from being damaged.

Note that, in FIGS. 3 (a) and 4 (a), the positions of the third accommodating unit 230 and the power supply unit 23 may be exchanged with the positions of the second accommodating unit 220 and the signal processing / communication unit 22. In this case, when the band 2 is wound around the wrist 10 so that the first accommodating portion 210 and the vibration sensor 21 are arranged at positions facing the radial artery 13 of the person to be measured, the second accommodating portion 220 and signal processing / communication are performed. The portion 22 is arranged so as to face the palmaris longus muscle 14 of the wrist 10. Therefore, since the signal processing / communication unit 22 is arranged in the region where the curvature of the ventral side of the wrist is relatively small, that is, the region 14A, damage to the signal processing / communication unit 22 can be prevented.

In FIGS. 1 (a), 2 (a), 3 (a) and 4 (a), the thicknesses of the first accommodating portion 210, the second accommodating portion 220 and the third accommodating portion 230 are the same. It may be different. The thicknesses of the first connecting portion 81 and the second connecting portion 82 are the same, but may be different.

FIG. 5A is a cross-sectional view showing the configuration of the vibration sensor 21. 5 (b) and 5 (c) are cross-sectional views of a case included in the vibration sensor 21. FIG. 6 is a plan view showing the configuration of the vibration sensor 21. In FIG. 5A, the direction perpendicular to the surface of the substrate is the Z direction, and the two directions orthogonal to each other in the plane perpendicular to the Z direction are the X direction (first direction) and the Y direction (second direction). .. FIG. 6 is a plan view of the substrate as viewed from the + Z side of FIG. 5 (a). 7 (a) to 7 (d) are diagrams showing an example of the case 40.

In FIG. 5A, the vibration sensor 21 has a substrate 30 (second substrate), a piezoelectric element 33, an element 37, a convex member 38, and a case 40. The space surrounded by the substrate 30 and the case 40 becomes the space 50. The substrate 30 is substantially flat and has a front surface 30b as a first surface and a back surface 30a as a second surface opposite the front surface 30b. The substrate 30 may be substantially rectangular or substantially square in XY plan view. Each of both ends 31 of the substrate 30 in the X direction has a length in the Y direction and is arranged at opposite positions with the piezoelectric element 33 or the convex member 38 interposed therebetween, and the substrate 30 is supported by the case 40. The substrate 30 may have a shape other than a rectangle as long as it has both ends 31. For example, if the substrate has a shape such as an ellipse, a circle, or a polygon in which both ends are cut and a straight portion that can be supported in the Y direction is provided, the substrate can be applied as the substrate 30. Therefore, the substrate 30 may have a shape other than a substantially square shape or a substantially rectangular shape as long as each of both ends 31 in the X direction of the substrate 30 has a length in the Y direction supported by the band 2.

The substrate 30 has a size of, for example, 15 mm (x) × 15 mm (y) × 0.8 mm (z). The substrate 30 has a pair of support side sides 30c facing each other and a pair of non-contact side sides 30d intersecting the support side sides 30c. When the substrate 30 is bent in the Z direction, the non-contact side 30d does not come into contact with the case 40. Both ends 31 of the substrate 30 in the X direction are provided on or near the pair of support side sides 30c. The substrate 30 is made of an insulating material, for example, an insulating resin such as glass epoxy. The substrate 30 may be formed of an insulating ceramic (for example, alumina), or the back surface 30a may be formed of a metal plate or an alloy plate whose back surface 30a is insulated with a resin film. A conductive pattern 32 is formed on the resin film. For example, at least the back surface 30a of the substrate 30 is provided with a conductive pattern 32 connected to a pad electrode (not shown). The piezoelectric element 33, and the element 37 (electrical component) constituting the circuit with the piezoelectric element 33, are electrically connected to the pad electrode via solder. Therefore, on the back surface 30a of the substrate 30, a region (for example, both ends 31) other than the region where the piezoelectric element 33 and the pad electrode on which the element 37 is mounted and the conductive pattern 32 are arranged is insulated. Both ends 31 of the back surface 30a of the substrate 30 function as insulating portions. Further, the substrate 30 has an elastic modulus of, for example, 10 GPa or more, which is higher than the elastic modulus of the band 2, the convex member 38, and the case 40.

The piezoelectric element 33 is arranged near the center of the back surface 30a of the substrate 30, and is fixed to the back surface 30a via a solder (not shown). The piezoelectric element 33 has a size of, for example, 3.2 mm (x) × 1.6 mm (y) × 0.8 mm (z). As shown in FIG. 6, the piezoelectric element 33 is located in the region where the convex member 38 is fixed when viewed from the + Z direction. That is, the piezoelectric element 33 is located in the second region (inside the dotted line region in FIG. 6) of the back surface 30a facing the first region (dotted line region in FIG. 6) of the front surface 30b to which the convex member 38 is fixed. It is fixed.

The piezoelectric element 33 has a piezoelectric body 34, a terminal electrode 35, and a terminal electrode 36. The piezoelectric body 34 is formed of, for example, a material containing PZT (lead zirconate titanate) as a main component. The piezoelectric body 34 is provided with polarization terminals (not shown) so as to sandwich the piezoelectric body 34 vertically on the + Z direction side and the −Z direction side in advance, and a predetermined voltage is applied from the + Z direction and the −Z direction to perform polarization processing. Is performed, and the polarization direction of the piezoelectric body 34 is set to the Z direction. The polarization terminal required for this polarization processing may be deleted or may be left. The terminal electrode 35 and the terminal electrode 36 are arranged so as to face each other with the piezoelectric body 34 interposed therebetween. The terminal electrode 35 is arranged on the −X side of the piezoelectric body 34, and the terminal electrode 36 is arranged on the + X side of the piezoelectric body 34. As a result, when the piezoelectric body 34 receives a force in the + Z direction and the −Z direction and is displaced, an electric charge is generated, and as a result, an electric signal corresponding to the force is generated between the

terminal electrodes

35 and 36.

In the present embodiment, when an external force is applied through the convex member 38, the substrate 30 bends up and down when viewed macroscopically, and the back surface 30a of the substrate 30 expands or contracts in the horizontal direction when viewed microscopically. doing. As a result, the piezoelectric element 33 mounted on the substrate 30 also expands and contracts, so that an electric signal is generated between the

terminal electrodes

35 and 36. Here, the polarization directions of the piezoelectric elements 33 are aligned in the vertical direction of the substrate 30.

The element 37 is, for example, a semiconductor element such as a FET (Field Effect Transistor) that amplifies the signal generated by the piezoelectric element 33, a passive component for adjusting the amplification factor, or the like, and is provided on the back surface 30a of the substrate 30. It is fixed to the pad electrode with solder or the like. The element 37 is electrically connected to the piezoelectric element 33 via a wiring (not shown). A shield metal (not shown) may be provided on the front surface 30b of the substrate 30. In this case, the shield metal is connected to the GND wiring and electrodes provided on the back surface 30a via vias.

The convex member 38 is fixed to the substantially center of the front surface 30b of the substrate 30 with an adhesive or an alloy joint, and protrudes from the front surface 30b of the substrate 30 in the −Z direction. As shown in FIG. 5A, the convex member 38 is provided at a position facing the piezoelectric element 33. The convex member 38 has a size of, for example, a diameter of 9.5 mm and a height of 7.4 mm. The convex member 38 is made of a resin such as silicon, polycarbonate or ABS, or a metal such as iron or nickel. When the convex member 38 is made of resin, it is fixed to the substrate 30 with the above-mentioned resin adhesive, and the elastic modulus of the convex member 38 is, for example, 0.1 to 3000 Mpa. When the convex member 38 is made of metal, it is fixed to the substrate 30 with the above-mentioned resin adhesive, brazing material or conductive paste, and the elastic modulus of the convex member 38 is on the order of Gpa. The convex member 38 may have a hollow shape such as an air tube as long as it has the elastic modulus described above. The convex member 38 projects and is exposed from the surface of the band 2, but the substrate 30 and the case 40 of the vibration sensor 21 are embedded inside the band 2.

Further, when the front surface 30b is entirely covered with a metal film, for example, copper or the like and shielded, it is appropriate to fix the convex member 38 to the front surface 30b with a brazing material or a conductive paste. Is. In this case, the metal film functions as a shield member and a fixing member of the convex member.

The case 40 is made of a resin such as silicon, polycarbonate or ABS. The elastic modulus of the case 40 is, for example, 50 to 5000 Mpa, which is lower than the elastic modulus of the substrate 30.

As shown in FIG. 5A, both ends 31 of the substrate 30 in the X direction are fixed to the step 44 of the case 40 in a double-sided beam shape. That is, both ends 31 of the substrate 30 in the X direction function as fixed ends of vibration of the substrate 30. When the band 2 is wound around the wrist and the convex member 38 receives a force due to the vibration of the pulse wave from the wrist, the force is transmitted from the convex member 38 to the substrate 30, and the substrate 30 bends in the + Z direction. Even when the substrate 30 is bent in the + Z direction, the piezoelectric element 33 and the element 37 do not come into contact with the case 40. Since the length of the convex member 38 in the X direction is smaller than the length of the substrate 30 in the X direction, the convex member 38 can efficiently bend the substrate 30. Further, since the convex member 38 is arranged at a position corresponding to the piezoelectric element 33 on the back surface 30a of the substrate 30, it is possible to efficiently bend the region of the front surface 30b of the substrate 30 near the piezoelectric element 33. can. As a result, the piezoelectric body 34 in the piezoelectric element 33 can be efficiently displaced, and the piezoelectric element 33 can detect the force due to the vibration of the pulse wave with high sensitivity.

As shown in FIGS. 5A and 7A, the case 40 has a plurality of first wall portions 42 having steps 44 supporting both ends 31 in the X direction of the substrate 30, and a plurality of first wall portions. A bottom portion 43 that connects the portions 42 and covers the back surface 30a of the substrate 30 is provided. The bottom portion 43 is formed parallel to the XY plane, and the plurality of first wall portions 42 are provided at both ends of the bottom portion 43 in the X direction and are arranged parallel to the YZ plane. Further, as shown in FIG. 7A, one of the first wall portions 42 is formed with a recess 45 for drawing out the wiring from the substrate 30 to the outside. For example, the signal line 71, the power line 72, and the ground (GND) line 73 extending from the signal processing / communication unit 22 of FIGS. 1 (a), 2 (a), 3 (a), and 4 (a) are recessed 45. It is connected to the wiring pattern 32 on the back surface 30a of the substrate 30 via the above.

As shown in FIG. 5A, a conductive film 41 as a conductive material is formed so as to cover the inner wall of the case 40 (the surfaces of the plurality of first wall portions 42 and the bottom portion 43 in contact with the space 50). As shown in FIG. 5B, the conductive film 41 may be formed so as to cover the outer wall of the case 40. Further, the conductive film 41 may be formed inside the case 40 as shown in FIG. 5 (c). In any of FIGS. 5A to 5C, the substrate 30 and the plurality of first walls are formed by fixing the substrate 30 made of an insulating material to the conductive film 41 with an insulating adhesive. The space 50 is sealed by the portion 42 and the bottom portion 43 to block electromagnetic waves from the outside. However, as shown in FIG. 7A, the XZ surface side has no wall and may be opened.

Further, it is preferable that the space 50 is filled with a material having an elastic modulus lower than that of the case 40. When the elastic modulus of the material filled in the space 50 is higher than the elastic modulus of the case 40, the vibration of the substrate 30 is suppressed. Therefore, the elastic modulus of the material filled in the space 50 is preferably set to 1/5 or less of the elastic modulus of the case 40. The material filled in the space 50 is, for example, a gas such as air or gas, a gel, rubber, or a resin. The elastic modulus of the material filled in the space 50 is, for example, 0 to 10 Mpa. The space 50 in FIG. 5A is filled with, for example, air.

In the case 40 shown in FIGS. 7 (a) and 7 (c), the two steps 44 are the two end portions 31 of the substrate 30 in the X direction, that is, the two opposite sides (a pair of support side sides 30c) of the back surface 30a of the substrate 30. ) Are supported respectively. In this case, since both ends 31 are fixed to the step 44 along the Y direction, the vibration of the substrate 30 in the X and Z directions is not suppressed, and the piezoelectric element 33 detects the vibration of the pulse wave. Can be done.

In the case 40 shown in FIGS. 7 (b) and 7 (d), the step 44 included in one first wall portion 42 has a recess 46, and the two steps 44 support the four corners of the substrate 30. In this case, since the four corners of the substrate 30 are fixed to the step 44, the vibration of the substrate 30 in the X, Y, and Z directions is not suppressed, and the piezoelectric element 33 is shown in FIGS. 7 (a) and 7 (a) and 7. The vibration of the pulse wave can be detected more accurately than in the case of (c).

The case 40 shown in FIGS. 7 (c) and 7 (d) has a plurality of second wall portions 47 connected to both ends of the plurality of first wall portions 42, erected from the bottom portion 43, and not in contact with the substrate 30. I have. In this case, the space 50 is sealed by the substrate 30, the plurality of first wall portions 42, the bottom portion 43, and the plurality of second wall portions 47 to block electromagnetic waves from the outside. Therefore, as compared with the case 40 of FIGS. 7 (a) and 7 (b), electromagnetic waves from the outside can be blocked more.

Further, the height of the second wall portion 47 may be lower than the height from the bottom portion 43 to the step 44. In this case, the effect of blocking electromagnetic waves from the outside is reduced, but since the second wall portion 47 acts as a beam, the case 40 itself is bent, that is, the bottom portion 43 is curved and the plurality of first wall portions 42 approach each other. The deflection can be reduced.

FIG. 8 is a block diagram showing an example of the configuration of the vibration sensor 21, the signal processing / communication unit 22, and the power supply unit 23. The positional relationship between the vibration sensor 21, the signal processing / communication unit 22, and the power supply unit 23 is the same as the positional relationship shown in FIGS. 1 (a), 2 (a), 3 (a), and 4 (a). .. The signal line 71, the power line 72, and the ground (GND) line 73 are connected between the vibration sensor 21 and the signal processing / communication unit 22. The power line 72 and the ground (GND) line 73 are connected between the signal processing / communication unit 22 and the power supply unit 23. The vibration sensor 21 includes a piezoelectric element 33 and an amplifier 371 as the element 37. Here, the amplifier 371 is, for example, an instrumentation amplifier or a charge amplifier. The amplifier 371 amplifies the signal (pulse wave signal) generated by the piezoelectric element 33, and outputs the signal (pulse wave signal) to the signal processing / communication unit 22 via the signal line 71.

The signal processing / communication unit 22 includes a programmable amplifier 221, an A / D converter 222, a communication module 223, and a microcomputer 224. The communication module 223 includes an antenna 225. The programmable amplifier 221 further amplifies the pulse wave signal received from the amplifier 371. The A / D converter 222 converts the pulse wave signal amplified by the programmable amplifier 221 into a digital signal. The microcomputer 224 converts the digital signal converted by the A / D converter 222 into communicable digital data. The microcomputer 224 also controls the communication timing of the communication module. The microcomputer 224 may remove a noise component from the digital signal converted by the A / D converter 222. The communication module 223 performs wireless communication such as BLE (Bluetooth (registered trademark) Low Energy) or wireless LAN, and transmits digital data indicating a pulse wave signal to an external device (for example, a computer or a smartphone) (not shown). ..

The power supply unit 23 includes a battery 231 such as a button battery or a rechargeable lithium-ion battery. The battery 231 supplies electric power to each component included in the signal processing / communication unit 22 and the vibration sensor 21 via the power line 72.

FIG. 9A is a cross-sectional view of the first accommodating portion 210 to the third accommodating portion 230 of the band 2. FIG. 9B is a cross-sectional view showing a first modification of the first accommodating portion 210 to the third accommodating portion 230. FIG. 10A is a cross-sectional view showing a second modification of the first accommodating portion 210 to the third accommodating portion 230. FIG. 10B is a cross-sectional view showing a third modification of the first accommodating portion 210 to the third accommodating portion 230. The configurations and features of FIGS. 9A to 10B are also applicable to the first band member 2A and the second band member 2B. In FIGS. 9A to 10B, the upper side of the figure is the wrist 10 side.

In FIGS. 9A to 10B, the power supply unit 23 is arranged between the vibration sensor 21 and the signal processing / communication unit 22, and is a wiring that connects the vibration sensor 21 and the signal processing / communication unit 22. (That is, the signal line 71, the power line 72, and the ground (GND) line 73) are routed around the power supply unit 23.

In the signal processing / communication unit 22 of FIGS. 9A to 10B, the programmable amplifier 221 and the A / D converter 222, the communication module 223, and the microcomputer 224 are formed on the substrate 226 (first substrate). There is. Further, the antenna 225 is arranged at the end 241 of the board 226, and the wiring (that is, the signal line 71, the power line 72 and the ground (GND) line 73) connecting to the vibration sensor 21 and the power supply 23 is the end of the board 226. It is extended from the terminal 242 on the substrate 226, which is closer to the vibration sensor 21 than the 241.

In this configuration, the GND line 73 is extended on the side opposite to the antenna 225 of the signal processing / communication unit 22, and the length of the GND line 73 facing the antenna 225 should secure at least 1/4 wavelength of the communication frequency. Is preferable. For example, the grounded λ / 4 monopole type antenna used as the antenna 225 in the present embodiment is a grounded type antenna in which one side of the half wavelength dipole antenna is replaced by GND. Therefore, by setting the length of the GND line 73 facing the antenna 225 to 1/4 wavelength or more of the communication frequency, deterioration of the characteristics of the antenna 225 can be prevented. Since the performance of the antenna 225 changes greatly depending on the size and shape of the GND, if the length of the GND line 73 is shorter than 1/4 wavelength of the communication frequency, the radiation efficiency of the antenna 225 will decrease, and the pulse wave detector and smartphone Alternatively, the communicable distance with an external device such as a PC becomes short, and stable communication may not be possible. Further, if the radiation efficiency of the antenna 225 is poor, the transmission output of the communication module 223 can be increased to improve the communication distance, but the power of the power supply unit 23 is consumed by that amount, and the power supply unit 23 is charged immediately. turn into.

Therefore, as shown in the GND lines 73 of FIGS. 1A to 4A, the GND lines 73 from the vibration sensor 21 to the signal processing / communication unit 22 can be used, including the GND of the substrate 30 of the vibration sensor 21. The vibration sensor 21, the signal processing / communication unit 22, and the power supply unit 23 are arranged as described above. That is, by extending the GND line 73 to the opposite side from the signal processing / communication unit 22 in which the antenna 225 is installed, a sufficient length of the GND line 73 can be secured, so that the characteristics of the antenna 225 are improved and the communication performance is improved. Can be improved.

Further, as shown in FIG. 9B, the second accommodating portion 220 and the third accommodating portion 230 may be integrated without being separated. That is, a region thinner than the thickness of the second accommodating portion 220 and the third accommodating portion 230 (for example, the second connecting portion 82) may not be formed between the second accommodating portion 220 and the third accommodating portion 230. The signal processing / communication unit 22 and the power supply unit 23 have the same thickness. In this case, since both the signal processing / communication unit 22 and the power supply unit 23 are arranged in the

area

14A or 15A, damage to both the signal processing / communication unit 22 and the power supply unit 23 can be prevented. The battery 231 in FIG. 9B is smaller than the battery 231 in FIG. 9A.

As shown in FIG. 10A, the second accommodating portion 220 may include a first reinforcing member 227 arranged between the wrist 10 and the signal processing / communication unit 22. The first reinforcing member 227 is made of a material harder than the band 2 such as resin or metal or a material having a large elastic modulus. The elastic modulus of the first reinforcing member 227 is, for example, 1000 Mpa or more, which is five times or more the elastic modulus of the band 2. The first reinforcing member 227 is, for example, a mold or a shield case that covers the programmable amplifier 221 and the A / D converter 222, the communication module 223, and the microcomputer 224. In this case, since the strength of the signal processing / communication unit 22 is improved by the first reinforcing member 227, damage to the signal processing / communication unit 22 can be prevented.

Further, as shown in FIG. 10A, the third accommodating portion 230 may include a second reinforcing member 232 arranged between the wrist 10 and the power supply portion 23. The second reinforcing member 232 is also made of a material that is harder than the band 2 such as resin or metal or has a high elastic modulus. The elastic modulus of the second reinforcing member 232 is, for example, 1000 Mpa or more, which is five times or more the elastic modulus of the band 2. The second reinforcing member 232 is, for example, a mold, a shield case, or a reinforcing plate that covers the battery 231. In this case, since the strength of the power supply unit 23 is improved by the second reinforcing member 232, damage to the power supply unit 23 can be prevented.

Even if the signal processing / communication unit 22 is hardened by the first reinforcing member 227 or the power supply unit 23 is hardened by the second reinforcing member 232, the flexibility of the first connecting part 81 and the second connecting part 82 remains. Since it is high, the first connecting portion 81 and the second connecting portion 82 are easily bent when the band 2 is attached to the wrist 10.

As shown in FIG. 10B, when the second accommodating portion 220 and the third accommodating portion 230 are integrated without being separated, the integrated second accommodating portion 220 and the third accommodating portion 230 are integrated. May include at least one of a first reinforcing member 227 and a second reinforcing member 232. In this case, it is possible to prevent damage to at least one of the signal processing / communication unit 22 and the power supply unit 23.

As described above, according to the present embodiment, the band 2 is fixed to the wrist 10 so that the first accommodating portion 210 accommodating the vibration sensor 21 is arranged at a position facing the radial artery 13 of the wrist 10. In such a case, at least one of the second accommodating unit 220 accommodating the signal processing / communication unit 22 and the third accommodating unit 230 accommodating the power supply unit 23 is a radius 11 and a ulna 12 on the dorsal or ventral side of the wrist 10. It is arranged so as to face the

intervening region

14A or 15A. Therefore, the vibration sensor 21 can detect the pulse wave signal of the radial artery 13, and at the same time, it is possible to prevent damage to at least one of the signal processing / communication unit 22 and the power supply unit 23.

In the present embodiment, the vibration sensor 21 is used as the sensor for detecting the pulse wave of the radial artery 13, but an LED (Light Emitting Diode) sensor may be used instead of the vibration sensor 21.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications are made within the scope of the gist of the present invention described in the claims.・ Can be changed.

1, 1A, 1B, 1C Pulse wave detection device 2 band 2A 1st band member 2B 2nd band member 21 Vibration sensor 22 Signal processing / communication unit 23 Power supply unit 30 Board 31 Both ends 33 Piezoelectric element 37 Element 38 Convex member 40 Case 41 Conductive film 42 1st wall 43 Bottom 44 Step 47 2nd wall 50 Space 210 1st accommodating 220 2nd accommodating 230 3rd accommodating

Claims

A sensor that detects pulse wave signals from the radial artery of the wrist,
A communication unit that wirelessly communicates the pulse wave signal to an external device,
A power supply unit that supplies power to the sensor and the communication unit, and
The first accommodating unit accommodating the sensor, the second accommodating unit accommodating the communication unit, the third accommodating unit accommodating the power supply unit, and the first accommodating unit, the second accommodating unit, and the third accommodating unit. It has a connecting portion that connects at least two of the above, and includes a band that is fixed to the wrist.
When the band is fixed to the wrist so that the first accommodating portion is arranged at a position facing the radial artery of the wrist, at least one of the second accommodating portion and the third accommodating portion is the wrist. A pulse wave detector arranged to face the area between the radius and ulna on the dorsal or ventral side of the wrist.
The pulse wave detection device according to claim 1, wherein the power supply unit is arranged between the sensor and the communication unit.
The second accommodating part
The pulse wave detection device according to claim 1 or 2, which is arranged between the wrist and the communication unit and includes a first reinforcing member having a elastic modulus larger than that of the band.
The third accommodating part is
The pulse wave detection device according to any one of claims 1 to 3, which is arranged between the wrist and the power supply unit and includes a second reinforcing member having a elastic modulus larger than that of the band.
The connecting portion
A first connecting portion formed between the first accommodating portion, the second accommodating portion and the third accommodating portion, and thinner than the thickness of the first accommodating portion, the second accommodating portion and the third accommodating portion. When,
Any one of claims 1 to 4, which is formed between the second accommodating portion and the third accommodating portion and includes the second accommodating portion and the second connecting portion thinner than the thickness of the third accommodating portion. The pulse wave detector according to the section.
The connecting portion
A first connecting portion formed between the first accommodating portion, the second accommodating portion and the third accommodating portion, and thinner than the thickness of the first accommodating portion, the second accommodating portion and the third accommodating portion. With
The pulse wave detection device according to any one of claims 1 to 4, wherein the second accommodating portion and the third accommodating portion are integrated without being separated.
The band is a band-shaped band, and includes a first locking portion and a second locking portion that locks the first locking portion.
The pulse wave detection device according to any one of claims 1 to 6, wherein the sensor is arranged at a position closer to the second locking portion than the communication unit and the power supply unit.
The band includes a first band member having a first attachment portion and a first locking portion to the watch, and a second locking portion that locks the second attachment portion to the watch and the first locking portion. With a second band member having
The sensor, the power supply unit, and the communication unit are arranged in the first band member.
The pulse wave detection device according to any one of claims 1 to 6, wherein the sensor is arranged at a position closer to the first locking portion than the communication unit and the power supply unit.
The band is a first band member having a first attachment portion to the watch and the first locking portion, and a second locking portion for locking the second attachment portion to the watch and the first locking portion. With a second band member having a portion
The sensor, the power supply unit, and the communication unit are arranged in the second band member.
The pulse wave detection device according to any one of claims 1 to 6, wherein the sensor is arranged at a position closer to the second mounting portion than the communication unit and the power supply unit.
The sensor is
A second substrate having a first surface and a second surface on the opposite side of the first surface,
A convex member fixed to the first surface at substantially the center of the second substrate,
A piezoelectric element fixed in the second region of the second surface facing the first region on the first surface to which the convex member is fixed.
A case is provided which covers the second surface to which the piezoelectric element is fixed, faces the piezoelectric element through a space, and supports two opposing sides of the second surface of the second substrate.
The pulse wave detection device according to any one of claims 1 to 8, wherein the space is filled with a material having an elastic modulus lower than that of the case.
The sensor is
Insulating portions provided on two opposite sides of the second surface of the second substrate, and
The pulse wave detection device according to claim 10, further comprising a conductive material formed on any one of the inner wall, the inner wall, and the outer wall of the case and electrically connected to the insulating portion.
The pulse wave detection device according to any one of claims 1 to 11, wherein the band is made of any of rubber, urethane, or silicon.