WO2019026387A1

WO2019026387A1 - Biological-information measurement device

Info

Publication number: WO2019026387A1
Application number: PCT/JP2018/019355
Authority: WO
Inventors: 吉村　隆; 勝義茶円; 勝桜井
Original assignee: アルプス電気株式会社
Priority date: 2017-07-31
Filing date: 2018-05-18
Publication date: 2019-02-07
Also published as: JPWO2019026387A1

Abstract

Disclosed is a biological-information measurement device with which it is possible to optically measure biological information, wherein the biological-information measurement device includes: a casing; a light-emitting unit provided within the casing, the light-emitting unit radiating light toward the outside of the casing; a light-receiving unit provided within the casing, the light-receiving unit being disposed so as to be separated from the light-emitting unit along a first direction; a light-shielding unit disposed within the casing and moreover disposed between the light-emitting unit and the light-receiving unit in the first direction, the light-shielding unit forming a space that cannot be directly reached by light from the light-emitting unit within the casing; and a temperature sensor disposed in the space.

Description

Biological information measuring device

The present disclosure relates to a biological information measurement device.

A temperature sensor for detecting the temperature of the finger is provided, and when a state in which the temperature of the finger is appropriate is detected, the light from the light emitting unit is emitted toward the finger, and the light passing through the finger is received by the light receiving unit. There is known a biological information measuring device which optically measures biological information such as pulse waves.

JP, 2015-188580, A

However, in the prior art as described above, the light from the light emitting unit may directly hit the temperature sensor, and it is difficult to detect the finger temperature with high accuracy.

Therefore, in one aspect, the present invention has an object to accurately detect the temperature of a finger in a biological information measuring device that optically measures biological information.

In one aspect, it is a biological information measuring device capable of optically measuring biological information,
And
A light emitting unit provided in the housing and emitting light toward the outside of the housing;
A light receiving unit provided in the housing and arranged to be separated in the first direction with respect to the light emitting unit;
A light shielding unit disposed in the housing and between the light emitting unit and the light receiving unit in the first direction, and forming a space in the housing in which the light from the light emitting unit does not reach directly;
There is provided a biological information measuring device including a temperature sensor disposed in the space.

In one aspect, according to the present invention, it is possible to accurately detect the temperature of a finger in a biological information measuring device that optically measures biological information.

It is a perspective view showing living body information measuring device 1 by one example. It is an exploded perspective view of living body information measuring device 1 seen from the upper part. It is an exploded perspective view of living body information measuring device 1 seen from the bottom. FIG. 2 is a plan view of the biological information measuring device 1; 5 is a cross-sectional view taken along line B-B in FIG. 4; FIG. 6 is an explanatory view of a measurement operation of the biological information measurement device 1. It is an enlarged view of the A section of FIG.

Hereinafter, each example will be described in detail with reference to the attached drawings.

FIG. 1 is a perspective view showing a biological information measuring device 1 according to one embodiment. Three orthogonal axes X, Y, Z are defined in FIG. Here, for the sake of explanation, the Z axis is in the vertical direction, and the positive side in the Z axis direction is referred to as “upper side”. In FIG. 1, a part of the biological information measuring device 1 is omitted. Specifically, the biological information measurement device 1 has a sensing surface on the lower side, and in FIG. 1, the upper part is not shown. Hereinafter, unless otherwise stated, the biological information measurement device 1 refers to the part of the biological information measurement device 1 shown in FIG.

2 and 3 are exploded perspective views of the biological information measuring device 1, FIG. 2 is a perspective view seen from above, and FIG. 3 is a perspective view seen from below. FIG. 4 is a plan view of the biological information measurement device 1, and FIG. 5 is a cross-sectional view taken along the line BB in FIG.

The biological information measuring device 1 is a device capable of optically measuring biological information through a sensing surface (window). The optically measurable biological information is optional, but is blood oxygen concentration of a living body (for example, a person).

The biological information measuring device 1 includes a housing 10, a light emitting unit 20, a light receiving unit 30, a light shielding unit 40, and a temperature sensor 50, as shown in FIGS.

The housing 10 accommodates various components of the biological information measurement device 1 therein. The housing 10 may be formed of a plurality of parts. For example, in the example shown in FIGS. 1 to 3, only the lower case portion is shown, and the lower case portion is closed by being fitted with the upper case portion (not shown). Form an internal space. Hereinafter, unless otherwise stated, the case 10 refers to the lower case portion. Further, in the following description, “the outside” refers to the outside of the housing 10, and the inside of the housing 10 refers to the internal space formed by the housing 10.

The housing 10 is a transparent portion that forms a sensing surface (window), and is formed of, for example, an acrylic resin. "Transparent" means transparent in the wavelength region used for measurement. While being transparent, light from the light emitting unit 20 can be efficiently emitted to the outside through the housing 10, and light from the outside can be efficiently received by the light receiving unit 30 via the housing 10. The housing 10 may be entirely transparent, or only the area forming the sensing surface may be transparent. For example, a bezel (not shown) may be attached to the outer periphery of the housing 10.

The housing 10 is, for example, a waterproof part. Being waterproof means that a hole or the like is not formed. In the case 10, the upper case portion and the lower case portion may be fluid-tightly coupled via a seal member or the like.

The light emitting unit 20 is provided in the housing 10 and emits light toward the outside. The light emitting unit 20 is formed of, for example, an LED (Light-Emitting Diode). In the present embodiment, as an example, the light emitting unit 20 is mounted on the lower surface of the sensor head substrate 100, as shown in FIG. The light emitting units 20 are provided at two places apart in the X-axis direction. The sensor head substrate 100 has a rectangular outer shape that fits inside the housing 10, as shown in FIG.

The light receiving unit 30 is provided in the housing 10. The light receiving unit 30 is disposed apart from the light emitting unit 20 in the X axis direction (an example of a first direction). Between the light receiving unit 30 and the light emitting unit 20 in the X-axis direction is a range facing the living body at the time of measurement (facing in the Z-axis direction). Among the light emitted from the light emitting unit 20 to the outside at the time of measurement, the light receiving unit 30 receives the light passing through the living body and entering the inside of the housing 10.

The light receiving unit 30 is formed of, for example, a photo diode. In the present embodiment, as an example, the light receiving unit 30 is mounted on the lower surface of the sensor head substrate 100, as shown in FIG. At this time, the light receiving unit 30 is disposed between the two light emitting units 20 in the X-axis direction. In this case, an area between the two light emitting units 20 in the X axis direction is an approximate sensing range in the X axis direction at the time of measurement. In the modification, only one light emitting unit 20 is provided. In this case, an effective sensing range in the X axis direction at the time of measurement is between the light emitting unit 20 and the light receiving unit 30 in the X axis direction.

The light shielding unit 40 is provided in the housing 10. The light shielding unit 40 is disposed between the light emitting unit 20 and the light receiving unit 30 in the X-axis direction. The light shielding unit 40 forms a space 70 in the housing 10 in which the light from the light emitting unit 20 does not reach directly. Although the light shielding part 40 is arbitrary if it is a material which does not permeate | transmit light, it has a surface which reflects light, for example. In the present embodiment, as an example, the light shielding portion 40 is formed by the reflection plate 120 and the double-sided adhesive tape 110 having a light shielding property. As shown in FIG. 3, the reflection plate 120 has a rectangular outer shape that fits inside the housing 10, has an outer shape similar to that of the sensor head substrate 100, and has a light shielding property via the double-sided adhesive tape 110. Bonded to the lower surface of the substrate 100. In the reflection plate 120, an opening 121 forming the space 70, an opening 122 forming the space in which the light emitting unit 20 is disposed, and an opening 124 forming the space in which the light receiving unit 30 is disposed are formed. Ru. On the lower surface 120 a of the reflection plate 120, a peripheral wall 123 protruding downward around the opening 122 is formed, and a peripheral wall 125 protruding downward around the opening 124 is formed. Although no reference numeral is given to the double-sided adhesive tape 110, as shown in FIGS. 2 and 3, openings corresponding to the

openings

121, 122 and 124 are formed.

In the present embodiment, as an example, as shown in FIGS. 3, 4 and 5, the space 70 is closed by the sensor head substrate 100 on the upper side, and flexible printed circuit (FPC) 140 on the lower side. It is closed by A substrate other than the FPC may be used. Further, the outer periphery of the sensor head substrate 100 and the FPC 140 in the vertical direction is surrounded by the light shielding portion 40. Accordingly, the light from the light emitting unit 20 does not reach the space 70 directly in the housing 10.

The temperature sensor 50 is disposed in the space 70 (the space 70 formed by the light shielding portion 40 as described above). As a result, the light from the light emitting unit 20 does not directly reach the temperature sensor 50 in the housing 10, so that the light sensor 20 is not substantially affected by the light from the light emitting unit 20 (i.e., is affected by heat). Accurate measurement can be realized. Also, a heat insulating portion (air layer) is provided between the light shielding portion 40 and the temperature sensor 50, and the space 70 is sealed by the light shielding portion 40, the sensor head substrate 100 and the FPC 140, and heat enters and leaves air as a medium. Even if the light shielding portion 40 is heated by the light emitting portion 20, the temperature sensor 50 is not affected by the heat from the light emitting portion 20.

Since the temperature sensor 50 is disposed in the space 70, it is located within the effective sensing range in the X-axis direction at the time of measurement. Thereby, the temperature sensor 50 can obtain the temperature related to the part of the living body to which the light receiving result of the light receiving unit 30 is given.

In the present embodiment, as an example, the temperature sensor 50 is mounted on the upper surface of the FPC 140 as shown in FIGS. 2 and 5. The FPC 140 is bonded to the lower surface of the reflecting plate 120 via the heat insulating double-sided tape 130. The double-sided adhesive tape 130 has a relatively large opening 132 in a manner to surround the

openings

121, 122, 124. Further, the FPC 140 is joined to the housing 10 via the transparent double-sided tape 150. Although the FPC 140 and the double-sided adhesive tape 150 are not given reference numerals, as shown in FIGS. 2 and 3, openings corresponding to the

openings

122 and 124 are formed.

Next, the measurement operation of the biological information measurement device 1 will be described with reference to FIG.

FIG. 6 is an explanatory view of the measurement operation of the biological information measurement device 1 and very schematically shows the biological information measurement device 1 placed on the surface of the living body to be measured in a cross sectional view. In FIG. 6, for the sake of explanation, the biological information measuring device 1 is very schematically shown, and illustration of one of the light emitting unit 20, the FPC 140, etc. is omitted. In addition, the light shielding portion 40 and the like are (conceptually) illustrated in a mode different from FIG.

At the time of measurement, the living body comes in contact with the sensing surface (for example, a finger is pressed against the sensing surface). In this contact state, when the light emitting unit 20 emits light to the outside, as schematically shown by an arrow R1 in FIG. 6, part of the light passes through the living body toward the light receiving unit 30 side. Then, part of the light passing through the living body enters the light receiving unit 30. The light receiving unit 30 generates an electrical signal according to the light reception result. This electrical signal contains information inside the living body. The electrical signal from the light receiving unit 30 is processed by a processing device (not shown).

Further, at the time of measurement, the temperature sensor 50 generates an electric signal (hereinafter, referred to as a "temperature signal"). At the time of measurement, the temperature sensor 50 faces the living body in contact with the sensing surface as described above. Thus, the temperature signal includes features responsive to the temperature of the living body contacting the sensing surface. In particular, since the temperature sensor 50 is disposed between the light emitting unit 20 and the light receiving unit 30 in the X-axis direction, the temperature sensor 50 can include features according to the temperature related to the living body part related to the electrical signal obtained by the light receiving unit 30. . Thereby, the temperature sensor 50 can measure the living body temperature concerning the measurement part of living body information with high accuracy compared with the case where it is not arranged between the light emitting unit 20 and the light receiving unit 30 in the X axis direction.

By the way, when a temperature sensor is disposed in the case 10 of the biological information measuring apparatus 1 capable of optically measuring biological information as in the present embodiment, there is a possibility that the light from the light emitting unit may directly hit the temperature sensor. It becomes difficult to accurately detect the temperature of a living body such as a finger.

In this respect, according to the present embodiment, as described above, since the light shielding portion 40 is provided, the possibility that the light from the light emitting portion 20 directly strikes the temperature sensor 50 is substantially eliminated. It is possible to accurately detect the temperature of the living body.

Next, with reference to FIG. 7, the preferable structure of FPC140 is demonstrated.

FIG. 7 is an enlarged view of a part A of FIG.

As shown in FIG. 6, the FPC 140 preferably has metal

conductive portions

141 and 142 having thermal conductivity. The

portions

141 and 142 are provided in a region overlapping the temperature sensor 50 in plan view (view in the Z-axis direction). Therefore, in the cross sectional view passing through the temperature sensor 50 shown in FIG. 6, the

portions

141 and 142 are present. Thus, even when the temperature sensor 50 faces the living body via the FPC 140, the heat path transmitted from the living body to the temperature sensor 50 via the FPC 140 can be secured, so that the temperature sensor 50 accurately measures the temperature of the living body such as a finger. It becomes possible to detect.

In the example shown in FIG. 7, the portion 141 is a metal layer that forms the top layer of the FPC 140, and is formed of, for example, a copper foil. Moreover, in the example shown in FIG. 7, the site | part 142 is a metal layer which forms the lowest layer of FPC140, for example, is formed with copper foil. In addition, copper foil may be formed over the most area | region of FPC140 as what is called a solid pattern. Thereby, the heat resistance concerning the course of the heat transmitted to temperature sensor 50 from living body via FPC140 can be reduced.

Also, the FPC 140 preferably has a through hole 144. The through holes 144 are also provided in a region overlapping with the temperature sensor 50 in plan view (view viewed in the Z-axis direction), similarly to the

portions

141 and 142. Thus, even when the temperature sensor 50 faces the living body via the FPC 140, the heat path transmitted from the living body to the temperature sensor 50 via the FPC 140 can be secured, so that the temperature sensor 50 accurately measures the temperature of the living body such as a finger. It becomes possible to detect. However, in a modification, the through hole 144 may also be provided at another place.

In the example shown in FIG. 7, the through holes 144 are filled with a highly thermally conductive material (eg, copper). At the time of filling, some gaps or holes may remain. As a result, the thermal resistance associated with the path of heat transmitted from the living body to the temperature sensor 50 via the FPC 140 can be further reduced. From the same point of view, also for the double-sided tape 150, a thin tape (adhesive layer) may be selected so as not to impede the heat conduction.

As mentioned above, although each Example was explained in full detail, it is not limited to a specific example, A various deformation | transformation and change are possible within the range described in the claim. In addition, it is also possible to combine all or a plurality of the components of the above-described embodiment.

This application is based on Japanese Patent Application No. 201 1 748 597, filed on July 31, 2017, the entire contents of which are incorporated herein by reference.

DESCRIPTION OF SYMBOLS 1 biological information measuring apparatus 10 case 20 light emitting unit 30 light receiving unit 40 light shielding unit 50 temperature sensor 70 space 100 sensor head substrate 110 double-sided tape 120 reflecting plate 120 a surface 121 opening 122 opening 123 opening 123 peripheral wall 124 opening 125 peripheral wall 130 141 Part 142 Part 144 Through Hole 150 Double-sided Tape

Claims

A biological information measuring device capable of optically measuring biological information, comprising:
And
A light emitting unit provided in the housing and emitting light toward the outside of the housing;
A light receiving unit provided in the housing and arranged to be separated in the first direction with respect to the light emitting unit;
A light shielding unit disposed in the housing and between the light emitting unit and the light receiving unit in the first direction, and forming a space in the housing in which the light from the light emitting unit does not reach directly;
A biological information measurement device including a temperature sensor disposed in the space.
The biological information measuring device according to claim 1, wherein the light shielding unit surrounds the light emitting unit.
The temperature sensor is provided on a substrate,
The biological information measuring device according to claim 1, wherein the substrate has a thermally conductive portion in a region overlapping with the temperature sensor in a direction perpendicular to the substrate.
The biological information measuring device according to claim 3, wherein the thermally conductive portion is formed of metal.
The biological information measuring apparatus according to claim 3, wherein the substrate has a through hole in a region overlapping with the temperature sensor when viewed in a direction perpendicular to the substrate.
The biological information measuring device according to any one of claims 1 to 5, wherein the housing includes a portion which transmits light from the light emitting unit to the outside and transmits light from the outside to the light receiving unit. .