WO2022218201A1

WO2022218201A1 - Electronic terminal device having pulse wave measurement function

Info

Publication number: WO2022218201A1
Application number: PCT/CN2022/085489
Authority: WO
Inventors: 王帆; 魏文雄; 高飞; 董泳江; 俞锋; 胡轶
Original assignee: 华为技术有限公司
Priority date: 2021-04-12
Filing date: 2022-04-07
Publication date: 2022-10-20
Also published as: CN115191934A

Abstract

The present application provides an electronic terminal device having a pulse wave measurement function, comprising a housing, a light source, a photoelectric detector, and a circuit substrate. The light source, the photoelectric detector, and the circuit substrate are located in the housing and are fixed relative to the housing; the light source and the photoelectric detector are mounted on the circuit substrate; at the portion of the housing used for being in contact with an organism, a first window and a second window are formed on the housing; the first window is used for light from the light source to pass through so as to be incident into a tissue of the organism; the second window is used for the light passing through the tissue to return, so as to be captured by the photoelectric detector to measure a pulse wave; and the first window and the light source are staggered from each other and/or the second window and the photoelectric detector are staggered from each other, so that a minimum distance between the first window and the second window is greater than a minimum distance between the light source and the photoelectric detector. Therefore, the present application can equivalently increase the length of an optical path between the light source and a photoelectric sensor, thereby increasing a signal-to-noise ratio when measuring the pulse wave.

Description

Electronic terminal equipment with the function of measuring pulse wave

This application claims the priority of the Chinese patent application with the application number 202110390462.9 and the invention titled "Electronic Terminal Device with Pulse Wave Measurement Function" filed with the China Patent Office on April 12, 2021, the entire contents of which are incorporated herein by reference Applying.

technical field

The present application relates to the field of pulse wave measurement, in particular to an electronic terminal device with the function of measuring pulse waves.

Background technique

Existing photoplethysmography (PPG) is based on a light source and a photodetector, measures the attenuated light reflected and absorbed by human tissue (such as skin tissue), records the pulsatile state of blood vessels, and measures pulse waves. FIG. 1A and FIG. 1B show an electronic terminal device with the function of measuring pulse wave. As shown in FIG. 1A and FIG. 1B , the electronic terminal device includes a housing 10 and a pulse wave sensing assembly (PPG module) 20 . The pulse wave sensing assembly 20 is accommodated inside the housing 10 and is fixed relative to the housing 10 . . The pulse wave sensing assembly 20 includes a light source (eg, an LED light source) 210 , a photodetector (eg, a photosensitive sensor) 220 , a circuit substrate 230 and a light blocking member 240 . The light source 210, the photodetector 220, and the light blocking member 240 are mounted on the circuit substrate 230 in a spaced manner from each other, and the light blocking member 240 is located between the light source 210 and the photodetector 220 to prevent the light from the light source 210 from not passing through The tissue TI of the living body is directly incident on the photodetector 220 . At a portion of the housing 10 for contact with a living body, the housing 10 is formed with a first window 110 and a second window 120, which are spaced apart from each other. The extension direction of the first window 110 is perpendicular to the casing 10 , and the first window 110 allows the light from the light source 210 to pass through, so as to be incident into the tissue TI of the living body. The extension direction of the second window 120 is perpendicular to the housing 10, and the second window 120 returns the light passing through the tissue TI to be captured by the photodetector 220, thereby converting the captured light signal into an electrical signal to sense the biological pulse wave. When the light from the light source 210 is directed to the tissue TI, it is scattered in the tissue TI, and the light transmitted through the tissue TI is received by the photodetector 220 and converted into an electrical signal, and then converted into a digital signal through an ADC. In tissue TI, the absorption of light by muscles, bones, veins, etc. is basically unchanged, while there is a pulsation of blood content in arteries, that is, the volume of blood changes, and the absorption of light also changes accordingly. Therefore, the absorption of light by arteries changes, and the absorption of light by other tissues is basically unchanged. When light is converted into electrical signals, the obtained signals can be divided into alternating AC signals and direct current DC signals, and the AC signal can be extracted from them. Get pulse wave information.

The pulse wave sensing component (PPG module) 20 is integrated on the existing electronic terminal equipment such as earphones. However, due to the limited structural space of electronic terminal equipment such as earphones, the size requirements of the pulse wave sensing component are very strict. As shown in FIGS. 1A and 1B , due to the design of the

windows

110 and 120 directly above both the light source 210 and the photodetector 220 , the light emitted by the light source 210 enters the tissue TI through the first window 110 , and passes through the arc-shaped propagation path, from The light transmitted by the tissue TI is received by the photodetector via the second window 120 . Therefore, in the existing pulse wave sensing assembly 20, once the distance between the light source 210 and the photodetector 220 is reduced, the distance between the position where the light enters the tissue TI and the position where the light exits is reduced, which may cause the following problems . On the one hand, the depth of the tissue TI reached by the light collected through the second window 120 decreases, and the vascular volume distribution of the tissue TI in the superficial layer decreases in deeper layers, which will lead to a decrease in the blood perfusion rate on the measurement path, alternating AC signals and direct current. The proportion of the DC signal decreases, and the signal-to-noise ratio under the same dynamic range of the module decreases; on the other hand, when the part of the electronic terminal equipment where the pulse wave sensing component 20 is installed is separated from the skin, it is easy to cause greater skin reflection Cross-light, that is, the ability to resist motion interference decreases, and signal detection is difficult under motion conditions.

SUMMARY OF THE INVENTION

In view of this, the purpose of this application is to provide an electronic terminal device with a pulse wave measurement function, which can reduce the distance between the light source and the photoelectric sensor by setting the window corresponding to the light source and the photoelectric sensor. position, which is equivalent to increasing the optical path length between the light source and the photoelectric sensor, thereby improving the signal-to-noise ratio when measuring the pulse wave.

To this end, the present application adopts the following technical solutions.

Solution 1 of the present application provides an electronic terminal device with a pulse wave measurement function, the electronic terminal device includes a housing, a light source, a photodetector and a circuit substrate, the light source, the photodetector and the circuit a substrate is located in the housing and is fixed relative to the housing, the light source and the photodetector are mounted on the circuit substrate,

At a portion of the housing for contact with a living body, the housing is formed with a first window and a second window through which light from the light source passes to be incident on the living body within the tissue, the second window for light passing through the tissue to return to be captured by the photodetector to measure pulse waves,

The first window and the light source are staggered from each other and/or the second window and the photodetector are staggered from each other, so that the minimum distance between the first window and the second window is greater than that between the light source and the photodetector. Minimum distance between the photodetectors.

By adopting the above solution, while reducing the distance between the light source and the photoelectric sensor, by correspondingly increasing the distance between the windows corresponding to the light source and the photoelectric sensor, the optical path between the light source and the photoelectric sensor can be equivalently increased. length, thereby improving the signal-to-noise ratio when measuring pulse waves. In addition, if the second window and the photodetector are staggered from each other, when the part of the electronic terminal device where the pulse wave detection component is installed is separated from the skin, the skin reflection string light that can be incident into the second window needs to have a very large value. The inclination angle actually causes the skin-reflected string light to be not easily reflected into the second window, thereby reducing the adverse effect of the skin-reflected light on the sensing result of the pulse wave sensing component.

According to the electronic terminal device with the function of measuring pulse wave according to the solution 1 of the present application, the solution 2 of the present application provides an electronic terminal device with the function of measuring the pulse wave as follows, wherein the first window and the second The minimum distance between the windows is greater than the maximum distance between the light source and the photodetector.

By adopting the above solution, the distance between the windows corresponding to the light source and the photoelectric sensor can be further increased, thereby further effectively increasing the optical path length between the light source and the photoelectric sensor, and improving the signal-to-noise ratio when measuring pulse waves.

According to the electronic terminal device with the function of measuring pulse wave according to the

solution

1 or 2 of the present application, the solution 3 of the present application provides an electronic terminal device with the function of measuring the pulse wave as follows, wherein the light source and the photoelectric The minimum distance between the detectors is L1, and the minimum distance between the first window and the second window is L2, then:

1mm≤L1≤4mm, and

1mm≤L2-L1.

By adopting the above solution, the selectable range of the minimum distance L1 between the light source and the photodetector and the selectable range of the corresponding minimum distance L2 between the first window and the second window are limited, so that L1 is sufficiently small In this case, using the optional range of L2 can effectively increase the optical path length between the light source and the photoelectric sensor.

According to the electronic terminal device with the function of measuring pulse wave according to any one of the solutions 1 to 3 of the present application, the solution 4 of the present application provides the following electronic terminal device with the function of measuring the pulse wave. In a plan view viewed in the direction of the housing or the circuit board, the line connecting the center of the light-emitting surface of the light source and the center of the active surface of the photodetector is used as a reference,

The first window is formed to have a symmetrical shape with respect to the straight line, and/or the second window is formed to have a symmetrical shape with respect to the straight line.

By adopting the above solution, the layout of the light source, photodetector, first window and second window is easy to realize.

According to the electronic terminal device with the function of measuring pulse wave according to any one of the solutions 1 to 4 of the present application, the solution 5 of the present application provides an electronic terminal device with the function of measuring the pulse wave as follows, the first The window has a first central axis along its extending direction, the first central axis passing through the center of the light emitting surface of the light source.

By adopting the above solution, on the premise of achieving an equivalent increase in the optical path length between the light source and the photoelectric sensor, the structural layout of the first window and the light source is easy to implement, and it is beneficial for the light of the light source to pass through the first window and enter the organism. body organization.

According to the electronic terminal device with the function of measuring pulse wave according to any one of the solutions 1 to 5 of the present application, the solution 6 of the present application provides an electronic terminal device with the function of measuring the pulse wave as follows, the second The window has a second central axis along its extension direction, the second central axis passing through the center of the active surface of the photodetector.

By adopting the above solution, on the premise of achieving an equivalent increase in the optical path length between the light source and the photoelectric sensor, the structural layout of the second window and the photodetector is easy to implement and facilitates the photodetector to capture the tissue passing through the organism and light passing through the second window.

According to the electronic terminal device with the function of measuring pulse wave according to any one of the solutions 1 to 6 of the present application, the solution 7 of the present application provides an electronic terminal device with the function of measuring the pulse wave as follows, the electronic terminal The device further includes a first light guide member, the first light guide member is located in the casing, the first light guide member is mounted on the part of the casing where the first window is formed, and is used to face the The first window conducts light from the light source.

By adopting the above solution, on the premise of achieving an equivalent increase in the optical path length between the light source and the photoelectric sensor, the first light guide member can effectively make the light from the light source pass through the first window to be incident on the tissue of the living body.

According to the electronic terminal device with a pulse wave measurement function according to the seventh solution of the present application, the eighth solution of the present application provides the following electronic terminal device with a pulse wave measurement function, wherein the first light guide The light source extends towards the first window.

By adopting the above solution, it is beneficial for the first light guide member to conduct more light from the light source to the first window.

According to the electronic terminal device with the function of measuring pulse wave according to the solution 7 or 8 of the present application, the solution 9 of the present application provides an electronic terminal device with the function of measuring the pulse wave as follows, A hollow channel is formed inside, and the side wall of the hollow channel is coated or coated with a reflective film.

By adopting the above solution, based on the above structure and utilizing the principle of total reflection of light, the first light guide member can guide more light from the light source to the first window.

According to the electronic terminal device with the function of measuring pulse wave according to the solution 7 or 8 of the present application, the solution 10 of the present application provides the following electronic terminal device with the function of measuring pulse wave, wherein the first light guide is A solid light guide film, the outer surface of the light guide film except the part corresponding to the first window and the photodetector is coated or coated with a reflective film.

According to the electronic terminal device with the function of measuring pulse wave according to the solution 10 of the present application, the solution 11 of the present application provides an electronic terminal device with the function of measuring the pulse wave, wherein the outer surface of the light guide film has a The portion corresponding to the first window is provided with a lens array or a prism array.

By adopting the above solution, based on the above structure, it is beneficial to diffusely reflect the light at the exit of the light guide film that realizes total reflection, so that the light passing through the first light guide member can smoothly enter the tissue of the living body through the first window. .

According to the electronic terminal device with a pulse wave measurement function according to any one of the solutions 1 to 11 of the present application, the solution 12 of the present application provides an electronic terminal device with a pulse wave measurement function as follows, the electronic terminal The device further includes a second light guide member, the second light guide member is located in the casing, the second light guide member is installed on the part of the casing where the second window is formed, and is used to face the A photodetector conducts light through the second window.

By adopting the above solution, on the premise of achieving an equivalent increase in the optical path length between the light source and the photoelectric sensor, the second light guide member can effectively guide the light passing through the tissue of the living body and passing through the second window to the photoelectric detector.

According to the electronic terminal device with the function of measuring pulse wave according to the solution 12 of the present application, the solution 13 of the present application provides the following electronic terminal device with the function of measuring the pulse wave, wherein the second light guide A second window extends towards the photodetector.

By adopting the above solution, it is beneficial for the second light guide member to conduct more light passing through the second window to the photodetector.

According to the electronic terminal device with the function of measuring pulse wave according to the solution 12 or 13 of the present application, the solution 14 of the present application provides an electronic terminal device with the function of measuring the pulse wave as follows, A hollow channel is formed inside, and the side wall of the hollow channel is coated or coated with a reflective film.

By adopting the above solution, based on the above structure and utilizing the principle of total reflection of light, the second light guide member can guide more light passing through the second window to the photodetector.

According to the electronic terminal device with the function of measuring pulse wave according to the solution 12 or 13 of the present application, the solution 15 of the present application provides the following electronic terminal device with the function of measuring the pulse wave, wherein the second light guide is A solid light guide film, the outer surface of the light guide film except the part corresponding to the second window and the photodetector is coated or coated with a reflective film.

According to the electronic terminal device having the function of measuring pulse wave according to the solution 15 of the present application, the solution 16 of the present application provides the following electronic terminal device having the function of measuring pulse wave, wherein the outer surface of the light guide film has a The corresponding part of the photodetector is provided with a lens array or a prism array.

By adopting the above solution, based on the above structure, it is beneficial to diffusely reflect light at the exit of the light guide film that realizes total reflection, so that the light passing through the second light guide member can be smoothly transmitted to the photodetector.

According to the electronic terminal device with the function of measuring pulse wave according to any one of the solutions 1 to 16 of the present application, the solution 17 of the present application provides an electronic terminal device with the function of measuring the pulse wave as follows, the first The cross-sectional shape of the window and the cross-sectional shape of the second window are formed as part of a ring, square, rectangle, ellipse or diamond.

By adopting the above solution, the window can be adapted to different situations, for example, some shaped windows are favorable for collecting light.

According to the electronic terminal device with a pulse wave measurement function described in any one of the solutions 1 to 17 of the present application, the solution 18 of the present application provides an electronic terminal device with a pulse wave measurement function as follows, the electronic terminal The apparatus also includes a light blocking member disposed between the light source and the photodetector for blocking light from the light source from being conducted directly to the photodetector.

By adopting the above solution, the light from the light source is prevented from being directly irradiated to the photodetector, so that the signal-to-noise ratio of the pulse wave is undesirably reduced, resulting in inaccurate measurement results.

According to the electronic terminal device with a pulse wave measurement function according to any one of the solutions 1 to 18 of the present application, the solution 19 of the present application provides an electronic terminal device with a pulse wave measurement function as follows, the electronic terminal The device is a headset, watch or bracelet.

By adopting the above solution, the types of electronic terminal devices for measuring pulse waves are expanded, and it is beneficial to implement the technology of the present application on different electronic terminal devices.

These and other aspects of the present application will be more clearly understood in the following description of the embodiment(s).

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments, features and aspects of the application and together with the description, serve to explain the principles of the application.

FIG. 1A is a partial top schematic view showing an existing electronic terminal device with a pulse wave measurement function.

FIG. 1B is a schematic partial cross-sectional view showing the electronic terminal device in FIG. 1A , wherein the electronic terminal device is in a state of measuring the pulse wave of a living body and the hatching of some components is omitted in the figure.

FIG. 2A is a partial top schematic view showing an electronic terminal device with a pulse wave measurement function according to the first embodiment of the present application, wherein the first light guide member is omitted.

FIG. 2B is a schematic partial cross-sectional view showing the electronic terminal device in FIG. 2A , wherein the electronic terminal device is in a state of measuring the pulse wave of a living body and the hatching of some components is omitted in the figure.

FIG. 3A is a partial top plan view illustrating an electronic terminal device with a pulse wave measurement function according to a second embodiment of the present application.

FIG. 3B is a schematic partial cross-sectional view showing the electronic terminal device in FIG. 3A , wherein the electronic terminal device is in a state of measuring the pulse wave of a living body and the hatching of some components is omitted in the figure.

4 is a schematic partial cross-sectional view illustrating an electronic terminal device with a pulse wave measurement function according to a third embodiment of the present application, wherein the electronic terminal device is in a state of measuring the pulse wave of a living body and parts are omitted in the figure The hatching of the part.

5A is a schematic partial cross-sectional view illustrating an electronic terminal device with a pulse wave measurement function according to a fourth embodiment of the present application, wherein the electronic terminal device is in a state of measuring the pulse wave of a living body and parts are omitted in the figure The hatching of the part.

FIG. 5B is an enlarged schematic view showing the second light guide in FIG. 5A .

FIG. 5C is an enlarged schematic view showing a modification of the second light guide in FIG. 5A .

FIG. 6 is a partial top plan view illustrating an electronic terminal device with a pulse wave measurement function according to a fifth embodiment of the present application.

7 is a partial cross-sectional schematic diagram illustrating an electronic terminal device with a pulse wave measurement function according to a sixth embodiment of the present application, wherein the electronic terminal device is in a state of measuring the pulse wave of a living body and parts are omitted in the figure The hatching of the part.

FIG. 8 is a structural block diagram illustrating a system architecture of an electronic terminal device according to the present application.

Description of reference numerals

10 Housing 110 First window 120 Second window 20 Pulse wave sensing component 210 Light source 220 Photodetector 230 Circuit substrate 240 Light blocking member

1 Housing 11 First window 12 Second window 2 Pulse wave sensing assembly 21 Light source 22 Photodetector 23 Circuit substrate 24 Light blocking member

31 The first

light guide member

32, 32', 32" the second light guide member 321' incident portion 322', 322" exit portion

TI organization.

Detailed ways

Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. The same reference numbers in the figures denote elements that have the same or similar functions. While various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise indicated.

The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.

In addition, in order to better illustrate the present application, numerous specific details are given in the following specific embodiments. It should be understood by those skilled in the art that the present application may be practiced without certain specific details. In some instances, methods, means and elements well known to those skilled in the art have not been described in detail so as to highlight the subject matter of the present application.

In this application, unless otherwise specified, the minimum distance between the first window and the second window refers to the minimum distance between the edge of the opening of the first window on the side where the tissue is located and the edge of the opening of the second window on the side where the tissue is located ; The minimum and maximum distances between the light source and the photodetector refer to the minimum and maximum distances between the edge of the light-emitting surface of the light source and the edge of the active surface of the photodetector (the sensing surface that can effectively sense light), respectively. distance.

The specific configuration of the electronic terminal device with the function of measuring pulse waves according to the first embodiment of the present application will be described below first with reference to the accompanying drawings.

(The specific configuration of the electronic terminal device with the function of measuring pulse waves according to the first embodiment of the present application)

As shown in FIG. 2A and FIG. 2B , the electronic terminal device with a pulse wave measurement function according to the first embodiment of the present application includes a housing 1 , a pulse wave sensing assembly 2 (PPG module) and a first light guide 31 .

In this embodiment, the pulse wave sensing assembly 2 is accommodated inside the casing 1 and is fixed relative to the casing 1 . The pulse wave sensing assembly 2 includes a light source 21 , a photodetector 22 , a circuit substrate 23 and a light blocking member 24 . . The light source 21 , the photodetector 22 and the light blocking member 24 are mounted on the circuit substrate 23 in a manner spaced apart from each other. The light blocking member 24 is located between the light source 21 and the photodetector 22, and the height of the light blocking member 24 is set to extend to a position close to the housing 1, or the height of the light blocking member 24 is set to extend to the housing 1 in the wall of the light source 21 to prevent the light from the light source 21 from being directly incident on the photodetector 22 without passing through the tissue TI of a living body (eg, human body).

It can be understood that the light blocking member 24 may be provided only on the circuit substrate 23, or a light blocking member may be provided on both the circuit substrate 23 and the housing 1, and the two light blocking members together prevent the light from the light source 21 from passing through the living body Tissue TI (eg, human body) is directly incident on the photodetector 22 .

It will be appreciated that Figures 2A and 2B only exemplarily show a housing or a portion of a housing. The casing 1 does not have to be flat, but can be curved or have a certain curvature or undulation.

In the present embodiment, at a portion of the casing 1 for contacting with the tissue TI of the living body, the casing 1 is formed with a first window 11 and a second window 12 which are spaced apart from each other . The extension direction of the first window 11 is perpendicular to the casing 1 , and the first window 11 allows the light from the light source 21 to pass through, so as to be incident into the tissue TI of the living body. The extension direction of the second window 12 is perpendicular to the casing 1, and the second window 12 returns the light passing through the tissue TI to be captured by the photodetector 22, and then converts the captured optical signal into an electrical signal to obtain the pulse of the living body Wave. The first window 11 and/or the second window 12 may be in the form of openings, and the first window 11 and/or the second window 12 may also be in the form of light-transmitting parts. For example, the first window 11 and/or the second window 12 may be constituted by disposing a light-transmitting member in the opening of the housing 1, or a partial area of the light-transmitting material may be colored, and the partial area (the first window 11 and/or The second window 12) is not colored to constitute the first window 11 and/or the second window 12.

As schematically shown in FIG. 2A , in a plan view viewed along a direction perpendicular to the housing 1 or the circuit substrate 23 , the shape of the light emitting surface of the light source 21 is a square, and the shape of the active surface of the photodetector 22 is also square. Correspondingly, in the above plan view, the shapes (cross-sectional shapes) of both the first window 11 and the second window 12 are also square. In order to facilitate the light from the light source 21 to be incident into the tissue TI of the living body, the size of the cross section of the first window 11 is slightly larger than the size of the light emitting surface of the light source 21 . In order to be able to efficiently collect light passing through the tissue TI of the living body, the size of the cross section of the second window 12 is slightly larger than the size of the active surface of the photodetector 22 . Further, in the above-mentioned plan view, the first window 11 is formed to have a symmetrical shape with respect to the straight line based on the line connecting the center of the light emitting surface of the light source 21 and the center of the active surface of the photodetector 22, The two windows 12 are also formed to have a symmetrical shape with respect to the straight line. This layout is conducive to processing and assembly and to ensure sensing effects, etc. It can be understood that, for the purpose of easy understanding, the light source 21 and the light blocking member 24 are drawn in FIG. 2A . In an actual product or design, in the viewing angle of FIG. 2A , the light source 21 and the light blocking member 24 may be blocked and invisible by the housing 1 .

As shown in FIGS. 2A and 2B , the first window 11 has a first central axis along its extending direction, and the first central axis does not pass through the center of the light-emitting surface of the light source 21 . The direction of the first window 11 facing away from the photodetector 22 and the second window 12 is offset by a certain distance with respect to the light source 21 . The second window 12 has a second central axis along its extension direction, the second central axis passing through the center of the active surface of the photodetector 22 . In this way, the minimum distance between the first window 11 and the second window 12 is made larger than the minimum distance between the light source 21 and the photodetector 22 . Since the light incident into the tissue TI of the living body through the first window 11 needs to be transmitted to the second window 12 through an arc-shaped propagation path, once the minimum distance between the first window 11 and the second window 12 is increased, the The radius of curvature of the above-mentioned arc propagation path is increased, so that the light can be incident on a deeper part in the tissue TI, which effectively increases the distance between the light source 21 and the photodetector 22 in the field of pulse wave measurement. Therefore, the blood vessel volume and blood perfusion rate on the path of light propagation are large enough, the ratio of the AC signal and the DC signal converted from the light signal captured by the photodetector 22 is good, and the signal-to-noise under the same dynamic range of the module relatively high.

In this embodiment, as shown in FIG. 2B , the first light guide member 31 is located in the casing 1 , and the first light guide member 31 is installed on the part of the casing 1 where the first window 11 is formed, and is used to face the first window. 11 conducts light from light source 21 . The first light guide member 31 extends from the light source 21 toward the first window 11 , so that the light from the light source 21 can smoothly enter the tissue TI of the living body through the first window 11 . The first light guide 31 can be a hollow tube structure made of glass or plastic, the inner surface or the outer surface of the first light guide 31 can be coated or coated with a reflective film, and the reflective film can be a metal film or a dielectric film Therefore, the first light guide member 31 can use the principle of total reflection to guide the light from the light source 21 into the tissue TI of the living body, so as to increase the amount of light conducted into the tissue TI of the living body through the first window 11 .

The specific configuration of the electronic terminal device having the function of measuring pulse waves according to the second embodiment of the present application will be described below with reference to the accompanying drawings.

(The specific configuration of the electronic terminal device with the function of measuring pulse waves according to the second embodiment of the present application)

The overall structure of the electronic terminal device with the function of measuring pulse wave according to the second embodiment of the present application is basically the same as that of the electronic terminal device with the function of measuring pulse wave according to the first embodiment of the present application, which will be mainly described below. difference between the two.

As shown in FIGS. 3A and 3B , the first window 11 has a first central axis along its extending direction, and the first central axis passes through the center of the light-emitting surface of the light source 21 . The second window 12 has a second central axis along its extending direction, and the second central axis does not pass through the center of the active surface of the photodetector 22 . The direction of the second window 12 facing away from the light source 21 and the first window 11 is offset with respect to the photodetector 22 by a certain distance. In this way, as in the first embodiment, the distance between the light source 21 and the photodetector 22 is equivalently increased. Therefore, the blood vessel volume and blood perfusion rate on the path of light propagation are large enough, so that the ratio of the AC signal and the DC signal converted from the light signal captured by the photodetector 22 is better, and the signal under the same dynamic range of the module has a good ratio. Noise is high. In addition, since the second window 12 and the photodetector 22 are staggered, when the part of the electronic terminal device where the pulse wave detection component is provided is separated from the skin, the skin-reflected string light that can enter the second window 12 needs to have A very large inclination angle actually causes the skin-reflected string light to be not easily reflected into the second window 12 , thereby reducing the adverse effect of the skin-reflected light on the sensing result of the pulse wave sensing component 2 .

The specific configuration of the electronic terminal device having the function of measuring pulse waves according to the third embodiment of the present application will be described below with reference to the accompanying drawings.

(The specific configuration of the electronic terminal device with the function of measuring pulse waves according to the third embodiment of the present application)

The overall structure of the electronic terminal device with the function of measuring pulse wave according to the third embodiment of the present application is basically the same as that of the electronic terminal device with the function of measuring pulse wave according to the second embodiment of the present application, which will be mainly described below. difference between the two.

In this embodiment, as shown in FIG. 4 , the electronic terminal device further includes a second light guide member 32 . The second light guide member 32 is located in the casing 1 , and the second light guide member 32 is installed at the part of the casing 1 where the second window 12 is formed, and is used for conducting the light passing through the second window 12 to the part of the photodetector 22 . source surface. The second light guide 32 extends from the first window 11 toward the photodetector 22 so that light passing through the second window 12 is conducted to the active surface of the photodetector 22 . The second light guide 32 can be a hollow tube structure made of glass or plastic, the inner surface or the outer surface of the second light guide 32 can be coated or coated with a reflective film, and the reflective film can be a metal film or a dielectric film Therefore, the second light guide member 32 can conduct the light passing through the second window 12 to the active surface of the photodetector 22 by utilizing the principle of total reflection. In this way, losses during the conduction of light via the second window 12 to the active surface of the photodetector 22 can be reduced.

It can be understood that in the embodiments shown in FIGS. 2A and 4 , the first light guide 31 and/or the second light guide 32 may also be installed or connected to the pulse wave sensing assembly 2 , for example, installed or connected to circuit board 3. Optionally, the first light guide 31 and/or the second light guide 32 may also be installed or connected to the housing 1 and the pulse wave sensing assembly 2 at the same time.

The specific configuration of the electronic terminal device having the function of measuring pulse waves according to the fourth embodiment of the present application will be described below with reference to the accompanying drawings.

(The specific configuration of the electronic terminal device with the function of measuring pulse waves according to the fourth embodiment of the present application)

The overall structure of the electronic terminal device with the function of measuring pulse wave according to the fourth embodiment of the present application is basically the same as that of the electronic terminal device with the function of measuring pulse wave according to the second embodiment of the present application, which will be mainly described below. difference between the two.

In this embodiment, as shown in FIG. 5A , the electronic terminal device further includes a second light guide member 32'. The second light guide member 32 ′ is located in the casing 1 , and the second light guide member 32 ′ is installed on the part of the casing 1 where the second window 12 is formed, and is used for conducting the light passing through the second window 12 to the photodetector 22 the active surface. The second light guide 32' extends from the second window 12 along the housing 1 towards the photodetector 22. As shown in FIG. 5B , the second light guide member 32 ′ adopts a solid light guide film structure as a whole, and the outer surface of the second light guide member 32 ′ can be coated or coated with a reflective film, and the reflective film can be a metal film or a medium film, whereby the second light guide 32 ′ can conduct the light passing through the second window 12 to the active surface of the photodetector 22 using the principle of total reflection. Further, the portion of the second light guide member 32' opposite to the second window 12 forms an incident portion 321', and the incident portion 321' may be a part of the surface from which the reflective film is removed. In addition, the portion of the second light guide member 32 ′ opposite to the active surface of the photodetector 22 forms an exit portion 322 ′. The exit portion 322 ′ may be a part of the surface from which the reflective film has been removed, or may be a miniature lens array formed by using a lens array. structure. This microstructure can be processed on the light guide member 32' by methods such as imprinting, which facilitates that the light guided by the second light guide member 32' is conducted to the photodetector 22 through the microstructure.

Further, in the modified example of the electronic terminal device with the pulse wave measurement function according to the fourth embodiment of the present application, as shown in FIG. 5C , the second light guide 32 ″ and the photodetector 22 may Another type of outgoing portion 322" is formed at the portion opposite to the source surface, and the outgoing portion 322" is a microstructure formed by a prism array. This microstructure can exert the same effect as the microstructure shown in FIG. 5B.

The specific configuration of the electronic terminal device having the function of measuring pulse waves according to the fifth embodiment of the present application will be described below with reference to the accompanying drawings.

(The specific configuration of the electronic terminal device with the function of measuring pulse waves according to the fifth embodiment of the present application)

The overall structure of the electronic terminal device with a pulse wave measurement function according to the fifth embodiment of the present application is basically the same as that of the electronic terminal device with a pulse wave measurement function according to the second embodiment of the present application. Explain the difference between the two.

In this embodiment, as shown in FIG. 6 , the shape of the second window 12 is a part of a ring. In a top view, the concave shape formed by the second window 12 is opposite to the photodetector 22 . Compared with the square-shaped second window 12 in the above embodiment, the lateral dimension of such a second window 12 can be larger, which is beneficial to increase the ability to collect light passing through the tissue TI of the living body.

In addition, in this embodiment, the first central axis of the first window 11 passes through the center of the light-emitting surface of the light source 21 . Optionally, in the top view shown in FIG. 6 , the minimum distance between the center of the first window 11 and the edge of the second window 12 is greater than the distance between the center of the light source 21 and the center of the photodetector 22 . In this way, the effect of the solution of the present application can be better exerted.

The specific configuration of the electronic terminal device having the function of measuring pulse waves according to the sixth embodiment of the present application will be described below with reference to the accompanying drawings.

(The specific configuration of the electronic terminal device with the function of measuring pulse waves according to the sixth embodiment of the present application)

By combining the solutions of the first embodiment and the second embodiment, the solution of the electronic terminal device with the function of measuring pulse wave according to the sixth embodiment of the present application is formed. Specifically, as shown in FIG. 7 , as in the first embodiment, the first central axis of the first window 11 does not pass through the center of the light-emitting surface of the light source 21 , and the first window 11 faces away from the second window 12 and the photodetector The direction of the device 22 is staggered from the light source 21 . Similar to the second embodiment, the second central axis of the second window 12 does not pass through the center of the active surface of the photodetector 22, and the second window 12 faces away from the first window 11 and the light source 21 in a direction away from the photodetector. 22 Staggered. In this way, by adopting the above scheme, the minimum distance between the first window 11 and the second window 12 is greater than the maximum distance between the light source 21 and the photodetector 22, which is further equivalent compared to the first and second embodiments The distance between the light source 21 and the photoelectric sensor is increased, and the beneficial effects of the present application can be better exerted. However, in this embodiment, it needs to be ensured that the increase of the distance between the first window 11 and the second window 12 will not affect the working state of the light source 21 and the photodetector 22 .

It can be understood that the electronic terminal device of the present application is not limited to the above-mentioned embodiments. Aspects or features of the different embodiments or parts thereof may be combined or substituted as appropriate.

The following describes the system architecture of the electronic terminal device according to the present application.

The electronic terminal devices with the function of measuring pulse waves according to the present application are mainly devices that can be worn on the human body, such as electronic terminal devices such as earphones, smart watches, and wristbands. When the user wears it, it can be automatically turned on, for example, to detect the PPG signal of the human body, so as to obtain physiological parameters such as the dynamic heart rate and blood oxygen saturation of the human body. As shown in FIG. 8 , the electronic terminal device is centered on the processor, and has external memory, display (optional), sensor, communication module, PPG module and other modules. The processor executes the program instructions to complete the control, management and signal processing of the entire system, especially to obtain the signals from the PPG module, and to obtain various physiological parameters after processing. Memory holds program instructions and data required during program execution. The display is used to provide a human-computer interaction interface, present various information to the user, and can realize touch input through touch operation. Sensors include accelerometers, gyroscopes, ambient light sensors and other types of sensors, which are used to sense the environment where the system is located and its own motion state. The communication module has wireless communication functions such as WiFi and Bluetooth, and is used to transmit data or receive commands to other electronic terminal devices such as mobile phones. The PPG module is used to detect physiological parameters such as the user's heart rate, and then pass it to the processor for further processing.

Exemplary embodiments of the present application are described above, and supplementary descriptions are provided below.

i. Although it is described in the above specific embodiments that the electronic terminal device is an earphone, a watch or a bracelet, etc., the present application is not limited to this. The electronic terminal device may be various electronic terminal devices that come into contact with the skin of a living body (for example, a human body) during use, and is not limited to the examples described in the above specific embodiments.

ii. Although it is described in the above specific embodiments that the cross-sectional shape of the first window 11 is formed as a square, and the cross-sectional shape of the second window 12 is formed as a part of a circle or a square, the present application is not limited thereto. The cross-sectional shape of the first window 11 and the cross-sectional shape of the second window 12 can be formed into any shape as required, for example, a rectangle, an ellipse, or a diamond can also be formed.

iii. In the above first to fourth embodiments, it is explained that the minimum distance between the first window 11 and the second window 12 is greater than the minimum distance between the light source 21 and the photodetector 22, but in order to increase the By increasing the distance between the first window 11 and the second window 12 to equivalently increase the distance between the light source 21 and the photodetector 22, the distance between the first window 11 and the second window 12 can be increased as in the sixth embodiment. The minimum distance between them is greater than the maximum distance between the light source 21 and the photodetector 22 . For example, optionally, if the minimum distance between the light source 21 and the photodetector 22 is L1, and the minimum distance between the first window 11 and the second window 12 is L2, then: 1mm≤L1≤4mm and 1mm ≤L2-L1. In addition, let the distance between the center of the light source 21 and the center of the photodetector 22 be L3, further optionally, L1<L3≤5mm and 1mm<L2-L3.

iv. Although the straight line connecting the center of the light-emitting surface of the light source 21 and the center of the active surface of the photosensor is used as a reference in the above specific embodiment, the shape of the first window 11 is formed to be symmetrical with respect to the straight line, the second The shape of the window 12 is formed to be symmetrical with respect to the straight line, but the present application is not limited thereto. In fact, the first window 11 and the second window 12 may be asymmetrical with respect to the above-mentioned straight line, even the first window 11 is only located on one side of the above-mentioned straight line and/or the second window 12 is only located on the other side of the above-mentioned straight line. Therefore, the first window 11 and the light source 21 can be laterally displaced. The second window 12 can be laterally offset from the photodetector 22 , thereby further preventing the reflected light from the skin from being undesirably conducted to the photodetector 22 via the second window 12 .

v. Although it is described in the above specific embodiment that the first central axis of the first window 11 and the second central axis of the second window 12 are perpendicular to the housing 1, the present application is not limited to this, the first central axis and the second central axis of the second window 12 are perpendicular to the housing 1. The two central axes can be inclined at a certain angle relative to the housing 1 .

Although the application is described herein in conjunction with the various embodiments, in practicing the claimed application, those skilled in the art can understand and realize the Other variations of the disclosed embodiments are disclosed. In the claims, the word "comprising" does not exclude other components or steps, and "a" or "an" does not exclude a plurality. The mere fact that certain measures are recited in mutually different dependent claims does not indicate that these measures cannot be combined to advantage.

Various embodiments of the present application have been described above, and the foregoing descriptions are exemplary, not exhaustive, and not limiting of the disclosed embodiments. Numerous modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein was chosen to best explain the principles of the various embodiments, the practical application or improvement over the technology in the marketplace, or to enable others of ordinary skill in the art to understand the various embodiments disclosed herein.

Claims

An electronic terminal device with the function of measuring pulse wave, the electronic terminal device comprises a casing, a light source, a photodetector and a circuit substrate, the light source, the photodetector and the circuit substrate are located in the casing and fixed relative to the housing, the light source and the photodetector are mounted on the circuit substrate,

At a portion of the housing for contact with a living body, the housing is formed with a first window and a second window through which light from the light source passes to be incident on the living body within the tissue, the second window for light passing through the tissue to return to be captured by the photodetector to measure pulse waves, characterized in that,

The first window and the light source are staggered from each other and/or the second window and the photodetector are staggered from each other, so that the minimum distance between the first window and the second window is greater than that between the light source and the photodetector. Minimum distance between the photodetectors.
The electronic terminal device with pulse wave measurement function according to claim 1, wherein the minimum distance between the first window and the second window is greater than the distance between the light source and the photodetector maximum distance.
The electronic terminal device with the function of measuring pulse wave according to claim 1, wherein, let the minimum distance between the light source and the photodetector be L1, let the first window and the second The minimum distance between windows is L2, then:

1mm≤L1≤4mm, and

1mm≤L2-L1.
The electronic terminal device with the function of measuring pulse wave according to any one of claims 1 to 3, characterized in that, in a plan view viewed along a direction perpendicular to the casing or the circuit substrate, the connection is The line between the center of the light-emitting surface of the light source and the center of the active surface of the photodetector is the reference,

The first window is formed to have a symmetrical shape with respect to the straight line, and/or the second window is formed to have a symmetrical shape with respect to the straight line.
The electronic terminal device with a pulse wave measurement function according to claim 4, wherein the first window has a first central axis along its extending direction, and the first central axis passes through the light source. The center of the luminous surface.
The electronic terminal device with the function of measuring pulse wave according to claim 4, wherein the second window has a second central axis along its extending direction, and the second central axis passes through the photodetector the center of the active surface of the device.
The electronic terminal device with a pulse wave measurement function according to any one of claims 1 to 3, characterized in that, the electronic terminal device further comprises a first light guide, and the first light guide is located in the Inside the casing, the first light guide member is installed on the part of the casing where the first window is formed, and is used for guiding the light from the light source toward the first window.
The electronic terminal device with a pulse wave measurement function according to claim 7, wherein the first light guide member extends from the light source toward the first window.
The electronic terminal device with the function of measuring pulse wave according to claim 8, wherein a hollow channel is formed inside the first light guide member, and a side wall of the hollow channel is coated or coated with a reflective film.
The electronic terminal device with the function of measuring pulse wave according to claim 8, wherein the first light guide member is a solid light guide film, and the part of the light guide film is separated from the first window and all the other parts. The outer surface other than the corresponding part of the photodetector is coated or plated with a reflective film.
The electronic terminal device with a pulse wave measurement function according to claim 10, wherein a lens array or a prism array is provided on the outer surface of the light guide film at a portion corresponding to the first window.
The electronic terminal device with the function of measuring pulse wave according to any one of claims 1 to 3, characterized in that, the electronic terminal device further comprises a second light guide, and the second light guide is located in the In the casing, the second light guide member is installed on the part of the casing where the second window is formed, and is used to guide the light passing through the second window toward the photodetector.
The electronic terminal device with a pulse wave measurement function according to claim 12, wherein the second light guide member extends from the second window toward the photodetector.
The electronic terminal device with the function of measuring pulse wave according to claim 13, wherein a hollow channel is formed inside the second light guide member, and a side wall of the hollow channel is coated or coated with a reflective film.
The electronic terminal device with the function of measuring pulse wave according to claim 13, wherein the second light guide member is a solid light guide film, and the part of the light guide film is separated from the second window and all the other parts. The outer surface other than the corresponding part of the photodetector is coated or plated with a reflective film.
The electronic terminal device with the function of measuring pulse wave according to claim 15, wherein a lens array or a prism array is provided on the outer surface of the light guide film corresponding to the photodetector.
The electronic terminal device with a pulse wave measurement function according to any one of claims 1 to 3, wherein the cross-sectional shape of the first window and the cross-sectional shape of the second window are formed as circles Part of a ring, square, rectangle, oval or diamond.
The electronic terminal device with a pulse wave measurement function according to any one of claims 1 to 3, wherein the electronic terminal device further comprises a light blocking member, and the light blocking member is disposed between the light source and the between the photodetectors for blocking the light from the light source from being directly conducted to the photodetectors.
The electronic terminal device with a pulse wave measurement function according to any one of claims 1 to 3, wherein the electronic terminal device is an earphone, a watch or a wristband.