CN115191934A

CN115191934A - Electronic terminal equipment with function of measuring pulse waves

Info

Publication number: CN115191934A
Application number: CN202110390462.9A
Authority: CN
Inventors: 王帆; 魏文雄; 高飞; 董泳江; 俞锋; 胡轶
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-04-12
Filing date: 2021-04-12
Publication date: 2022-10-18
Also published as: WO2022218201A1

Abstract

The application provides an electronic terminal equipment with measure pulse ripples function, it includes casing, light source, photoelectric detector and circuit substrate. The light source, the photodetector and the circuit substrate are positioned within and fixed relative to the housing. The light source and the photodetector are mounted on the circuit substrate, and the housing is formed with a first window through which light from the light source passes to be incident into a tissue of the living body and a second window through which light passing through the tissue returns to be captured by the photodetector to measure a pulse wave, at a portion of the housing for contact with the living body. The first window and the light source are offset from each other and/or the second window and the photodetector are offset from each other such that a minimum distance between the first window and the second window is greater than a minimum distance between the light source and the photodetector. Thus, the optical path length between the light source and the photoelectric sensor can be equivalently increased, and the signal-to-noise ratio in pulse wave measurement is improved.

Description

Electronic terminal equipment with function of measuring pulse waves

Technical Field

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

Background

The conventional photoplethysmography (PPG) is based on a light source and a photodetector, and measures attenuated light reflected and absorbed by a human tissue (e.g., skin tissue), records a pulsating state of a blood vessel, and measures a pulse wave. Fig. 1A and 1B show an electronic terminal device having a function of measuring a pulse wave. As shown in fig. 1A and 1B, the electronic terminal device includes a housing 10 and a pulse wave sensing component (PPG module) 20, wherein the pulse wave sensing component 20 is accommodated inside the housing 10 and fixed relative to the housing 10. The pulse wave sensing assembly 20 includes a light source (e.g., an LED light source) 210, a photodetector (e.g., a photosensor) 220, a circuit substrate 230, and a flag 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, with the light blocking member 240 being located between the light source 210 and the photodetector 220, to prevent light from the light source 210 from being directly incident on the photodetector 220 without passing through the tissue TI of a living body. The housing 10 is formed with a first window 110 and a second window 120 at a portion of the housing 10 for contact with a living body, the first window 110 and the second window 120 being spaced apart from each other. The first window 110 extends perpendicularly to the housing 10, and the first window 110 allows light from the light source 210 to pass therethrough so as to be incident into the tissue TI of the living body. The second window 120 extends perpendicularly to the housing 10, and the second window 120 allows the light passing through the tissue TI to return to be captured by the photodetector 220, so as to convert the captured light signal into an electrical signal to sense the pulse wave of the living body. When light from the light source 210 is directed to the tissue TI, scattering occurs in the tissue TI, and the light transmitted through the tissue TI is received by the photodetector 220 and converted into an electrical signal, which is then converted into a digital signal by the ADC. In the tissue TI, the absorption of light by muscles, bones, veins, etc. is substantially constant, while the pulsation of the blood content in arteries, i.e., the change in the volume of blood, varies correspondingly. Therefore, the absorption of the artery to light is changed, the absorption of other tissues to light is basically unchanged, when light is converted into an electric signal, the obtained signal can be divided into an Alternating Current (AC) signal and a Direct Current (DC) signal, and the AC signal can be extracted to obtain pulse wave information.

A pulse wave sensing component (PPG module) 20 is integrated on an existing electronic terminal device, such as a headset or the like. However, since the structural space of the electronic terminal device such as the earphone is limited, the size requirement of the pulse wave sensing component is very strict. As shown in fig. 1A and 1B, since the

windows

110, 120 are designed directly above both the light source 210 and the photodetector 220, light emitted by the light source 210 enters the tissue TI via the first window 110, and light transmitted from the tissue TI is received by the photodetector via the second window 120 via the arc-shaped propagation path. Therefore, in the conventional 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 light enters the tissue TI and the exit position 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 tissue TI decreases at a deeper layer of the superficial vascular volume distribution, which may result in a decrease of the blood perfusion rate on the measurement path, a decrease of the ratio of the AC signal to the DC signal, and a decrease of the signal-to-noise ratio at the same module dynamic range; on the other hand, when the portion of the electronic terminal device where the pulse wave sensing assembly 20 is disposed is separated from the skin, it is easy to cause a larger skin reflection crosstalk, i.e., a decrease in resistance to motion disturbance, and signal detection is difficult under motion conditions.

Disclosure of Invention

In view of the above, an object of the present invention is to provide an electronic terminal device having a function of measuring a pulse wave, which can increase an optical path length between a light source and a photosensor equivalently by setting positions of windows corresponding to the light source and the photosensor under the condition of reducing a distance between the light source and the photosensor, thereby improving a signal-to-noise ratio when measuring the pulse wave.

Therefore, the following technical scheme is adopted in the application.

Scheme 1 of the application provides an electronic terminal device with a function of measuring pulse waves, the electronic terminal device comprises a shell, a light source, a photoelectric detector and a circuit substrate, the light source, the photoelectric detector and the circuit substrate are positioned in the shell and fixed relative to the shell, the light source and the photoelectric detector are arranged on the circuit substrate,

at a portion of the housing for contact with a living organism, the housing is formed with a first window through which light from the light source passes to be incident into tissue of the living organism and a second window through which light passing through the tissue returns to be captured by the photodetector to measure a pulse wave,

the first window and the light source are offset from each other and/or the second window and the photodetector are offset from each other such that a minimum distance between the first window and the second window is greater than a minimum distance between the light source and the photodetector.

Through adopting above-mentioned scheme, can be under the condition of reducing the distance between light source and the photoelectric sensor, through corresponding the distance between the window that increases and light source and photoelectric sensor correspond, the light path length between equivalent increase light source and the photoelectric sensor to improve the SNR when measuring the pulse wave. In addition, if the second window and the photodetector are offset from each other, when the portion of the electronic terminal device where the pulse wave detection assembly is disposed is separated from the skin, the skin reflection crosstalk that can be incident into the second window needs to have a very large inclination angle, which actually causes the skin reflection crosstalk to be not easily reflected into the second window, thereby reducing adverse effects of the skin reflection light on the sensing result of the pulse wave sensing assembly.

According to the electronic terminal device with the function of measuring the pulse wave in the scheme 1 of the present application, the scheme 2 of the present application provides an electronic terminal device with the function of measuring the pulse wave, wherein the minimum distance between the first window and the second window is greater than the maximum distance between the light source and the photoelectric detector.

Through adopting above-mentioned scheme, can further increase the distance between the window that corresponds with light source and photoelectric sensor to further the equivalent light path length that increases between light source and the photoelectric sensor, the SNR when improving the measurement pulse wave.

According to

scheme

1 or 2 of the application, the electronic terminal device with the function of measuring the pulse wave, scheme 3 of the application provides an electronic terminal device with the function of measuring the pulse wave, and the following electronic terminal device with the function of measuring the pulse wave is provided, wherein the minimum distance between the light source and the photoelectric detector is L1, and the minimum distance between the first window and the second window is L2, so that the requirements are met:

l1 is more than or equal to 1mm and less than or equal to 4mm, and

1mm≤L2-L1。

by adopting the scheme, the selectable range of the minimum distance L1 between the light source and the photoelectric detector and the selectable range of the minimum distance L2 between the corresponding first window and the second window are defined, so that the optical path length between the light source and the photoelectric sensor can be increased in a reliable and equivalent manner by using the selectable range of L2 under the condition that L1 is made to be sufficiently small.

An aspect 4 of the present application provides an electronic terminal device having a function of measuring a pulse wave, according to any one of aspects 1 to 3 of the present application, with reference to a straight line connecting a center of a light emitting surface of the light source and a center of an active surface of the photodetector in a plan view viewed in a direction perpendicular to the housing or the circuit substrate,

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 scheme, the layout of the light source, the photoelectric detector, the first window and the second window is easy to realize.

According to the electronic terminal device with a function of measuring pulse waves of any one of aspects 1 to 4 of the present application, aspect 5 of the present application provides an electronic terminal device with a function of measuring pulse waves, wherein the first window has a first central axis along an extending direction thereof, and the first central axis passes through a center of a light emitting surface of the light source.

By adopting the scheme, on the premise of equivalently increasing the length of the optical path between the light source and the photoelectric sensor, the structural layout of the first window and the light source is easy to realize and is beneficial to the light of the light source to pass through the first window to enter the tissues of the organism.

According to the electronic terminal device with a function of measuring pulse waves of any one of aspects 1 to 5 of the present application, aspect 6 of the present application provides an electronic terminal device with a function of measuring pulse waves, in which the second window has a second central axis along an extending direction thereof, and the second central axis passes through a center of an active surface of the photodetector.

By adopting the scheme, on the premise of equivalently increasing the optical path length between the light source and the photoelectric sensor, the structural layout of the second window and the photoelectric detector is easy to realize and is favorable for the photoelectric detector to capture the light which passes through the tissue of the organism and passes through the second window.

According to the electronic terminal device with the function of measuring pulse waves in any one of the aspects 1 to 6 of the present application, aspect 7 of the present application provides an electronic terminal device with the function of measuring pulse waves, which further includes a first light guide member, the first light guide member being located in the housing, the first light guide member being installed at a portion of the housing where the first window is formed, for guiding light from the light source toward the first window.

By adopting the scheme, on the premise of equivalently increasing the optical path length between the light source and the photoelectric sensor, the first light guide piece can effectively enable the light from the light source to penetrate through the first window to be incident on the tissue of the organism.

According to the electronic terminal device having the function of measuring pulse waves of claim 7 of the present application, claim 8 of the present application provides an electronic terminal device having the function of measuring pulse waves, wherein the first light guide member extends from the light source toward the first window.

Through adopting above-mentioned scheme, be favorable to first leaded light spare to the light that first window conducts more comes from the light source.

According to the electronic terminal device with a function of measuring pulse waves of claim 7 or 8 of the present application, claim 9 of the present application provides an electronic terminal device with a function of measuring pulse waves, wherein a hollow channel is formed inside the first light guide, and a side wall of the hollow channel is coated or plated with a reflective film.

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

According to the electronic terminal device with the function of measuring pulse waves of the present application, in claim 7 or 8, in claim 10, there is provided an electronic terminal device with the function of measuring pulse waves, wherein the first light guide member is a solid light guide film, and a reflective film is coated or plated on an outer surface of the light guide film except for a portion corresponding to the first window and the photodetector.

According to the electronic terminal device with the function of measuring pulse waves in the claim 10 of the present application, the claim 11 of the present application provides an electronic terminal device with the function of measuring pulse waves, wherein a lens array or a prism array is arranged on the outer surface of the light guide film at a position corresponding to the first window.

By adopting the above scheme, based on the above structure, it is favorable to make light take place diffuse reflection in the exit of the leaded light membrane that realizes the total reflection to make the light that passes through first leaded light spare can be smoothly in the tissue of incident organism via first window.

According to the electronic terminal device with the function of measuring pulse waves in any one of the schemes 1 to 11 of the present application, scheme 12 of the present application provides an electronic terminal device with the function of measuring pulse waves, which further includes a second light guide member, the second light guide member is located in the housing, and the second light guide member is installed at a position of the housing where the second window is formed, so as to guide light passing through the second window toward the photodetector.

By adopting the scheme, on the premise of equivalently increasing the length of the optical path between the light source and the photoelectric sensor, the second light guide piece can effectively conduct the light which passes through the tissue of the organism and passes through the second window to the photoelectric detector.

According to the electronic terminal device with a function of measuring pulse waves of claim 12 of the present application, claim 13 of the present application provides an electronic terminal device with a function of measuring pulse waves, wherein the second light guide extends from the second window toward the photodetector.

By adopting the scheme, the second light guide part can conduct more light passing through the second window to the photoelectric detector.

According to the electronic terminal device having a function of measuring pulse waves of claim 12 or 13 of the present application, claim 14 of the present application provides an electronic terminal device having a function of measuring pulse waves, wherein a hollow channel is formed inside the second light guide member, and a side wall of the hollow channel is coated or plated with a reflective film.

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

According to the electronic terminal device with the function of measuring pulse waves in the present application, in claim 12 or 13, in claim 15, there is provided an electronic terminal device with the function of measuring pulse waves, wherein the second light guide member is a solid light guide film, and a reflective film is coated or plated on the outer surface of the light guide film except for the portion corresponding to the second window and the photodetector.

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

According to the electronic terminal equipment with measure pulse ripples function of scheme 15 of this application, scheme 16 of this application provides the following electronic terminal equipment with measure pulse ripples function, the position that corresponds of the surface of leaded light membrane with photoelectric detector is provided with lens array or prism array.

Through adopting above-mentioned scheme, based on above-mentioned structure, be favorable to making light take place diffuse reflection in the exit of the leaded light membrane that realizes the total reflection to the messenger can conduct photoelectric detector smoothly via the light of second leaded light spare.

An aspect 17 of the present application provides an electronic terminal device having a function of measuring a pulse wave according to any one of aspects 1 to 16 of the present application, in which a cross-sectional shape of the first window and a cross-sectional shape of the second window are formed as a part of a circular ring, a square, a rectangle, an ellipse, or a diamond.

By adopting the scheme, the window can be suitable for different conditions, for example, the window with certain shape is beneficial to collecting light.

According to the electronic terminal device with the function of measuring pulse waves in any one of the schemes 1 to 17 of the present application, the scheme 18 of the present application provides an electronic terminal device with the function of measuring pulse waves, wherein the electronic terminal device further comprises a light blocking member, the light blocking member is arranged between the light source and the photoelectric detector, and is used for blocking light from the light source from being directly conducted to the photoelectric detector.

By adopting the above-mentioned scheme, prevent that the light from light source from directly shining the photoelectric detector to pulse wave SNR reduces and leads to the measuring result inaccurate undesirably.

According to the electronic terminal device with a function of measuring pulse waves of any one of aspects 1 to 18 of the present application, aspect 19 of the present application provides an electronic terminal device with a function of measuring pulse waves, wherein the electronic terminal device is an earphone, a watch or a bracelet.

By adopting the scheme, the type of the electronic terminal equipment for measuring the pulse wave is expanded, and the technology of the application is favorably realized on different electronic terminal equipment.

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

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 schematic top view showing a conventional electronic terminal device having a function of measuring a pulse wave.

Fig. 1B is a partially sectional view schematically showing the electronic terminal device in fig. 1A in a state of measuring a pulse wave of a living body, and hatching of a part of the components is omitted in the figure.

Fig. 2A is a schematic partial top view illustrating an electronic terminal device having a function of measuring pulse waves according to a first embodiment of the present application, in which a first light guide is omitted.

Fig. 2B is a partially cross-sectional schematic view showing the electronic terminal device in fig. 2A in a state of measuring a pulse wave of a living body with hatching of a part of the components omitted in the drawing.

Fig. 3A is a schematic partial top view illustrating an electronic terminal device having a function of measuring pulse waves according to a second embodiment of the present application.

Fig. 3B is a partially sectional view schematically showing the electronic terminal device in fig. 3A in a state of measuring a pulse wave of a living body and hatching of a part of the components is omitted in the figure.

Fig. 4 is a partially cross-sectional view schematically showing an electronic terminal device having a function of measuring a pulse wave according to a third embodiment of the present application, in a state of measuring a pulse wave of a living body, with hatching of part of components omitted in the figure.

Fig. 5A is a partially cross-sectional schematic view showing an electronic terminal device having a function of measuring a pulse wave according to a fourth embodiment of the present application, in which the electronic terminal device is in a state of measuring a pulse wave of a living body and hatching of a part of components is omitted in the figure.

Fig. 5B is an enlarged schematic view illustrating 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 view schematic diagram showing an electronic terminal device having a function of measuring pulse waves according to a fifth embodiment of the present application.

Fig. 7 is a partially cross-sectional view showing an electronic terminal device having a function of measuring a pulse wave according to a sixth embodiment of the present application, in a state of measuring a pulse wave of a living body, with hatching of part of the components omitted in the figure.

Fig. 8 is a block diagram showing a system architecture of an electronic terminal device according to the present application.

Description of the reference numerals

10 casing 110 first window 120 second window 20 pulse wave sensing assembly 210 light source 220 photoelectric detector 230 circuit substrate 240 light barrier

1 casing 11 first window 12 second window 2 pulse wave sensing assembly 21 light source 22 photoelectric detector 23 circuit substrate 24 light barrier

31 first light guide 32, 32 'second light guide 321' incident part 322', 322' emergent part

TI tissue.

Detailed Description

Various exemplary embodiments, features and aspects of the present application will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically 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, numerous specific details are set forth in the following specific examples in order to provide a better understanding of the present application. It will be understood by those skilled in the art that the present application may be practiced without some of these specific details. In some instances, methods, means, elements well known to those skilled in the art have not been described in detail so as not to obscure the present application.

In the present 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 distance and the maximum distance between the light source and the photodetector refer to the minimum distance and the maximum distance between the edge of the light emitting surface of the light source and the edge of the active surface (sensing surface capable of effectively sensing light) of the photodetector, respectively.

Hereinafter, a specific configuration of an electronic terminal device having a function of measuring a pulse wave according to a first embodiment of the present application will be described first with reference to the drawings.

(concrete constitution of electronic terminal device having function of measuring pulse wave according to first embodiment of the present application)

As shown in fig. 2A and 2B, the electronic terminal device with function of measuring pulse waves according to the first embodiment of the present application comprises a case 1, a pulse wave sensing assembly 2 (PPG module) and a first light guide 31.

In the present embodiment, the pulse wave sensing assembly 2 is accommodated in the housing 1 and fixed relative to the housing 1, and 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 spaced-apart manner 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 portion near the housing 1, or the height of the light blocking member 24 is set to extend into the wall of the housing 1, so as 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 (e.g., a human body).

It is to be understood that the light blocking member 24 may be provided only on the circuit substrate 23, or may be provided on both the circuit substrate 23 and the housing 1, both of which prevent the light from the light source 21 from being directly incident on the photodetector 22 without passing through the tissue TI of the living body (e.g., human body).

It is understood that fig. 2A and 2B only exemplarily show a housing or a portion of a housing. The housing 1 need not be planar but may be curved or have some curvature or undulation.

In the present embodiment, the housing 1 is formed with a first window 11 and a second window 12 at a portion of the housing 1 for contact with the tissue TI of the living body, the first window 11 and the second window 12 being spaced apart from each other. The first window 11 extends in a direction perpendicular to the housing 1, and the first window 11 allows light from the light source 21 to pass therethrough and enter the tissue TI of the living body. The second window 12 extends perpendicularly to the housing 1, and the second window 12 allows the light passing through the tissue TI to return to be captured by the photodetector 22, so as to convert the captured light signal into an electrical signal to obtain the pulse wave of the living body. The first window 11 and/or the second window 12 may be in the form of an opening, and the first window 11 and/or the second window 12 may also be in the form of a light-transmitting portion. For example, the first window 11 and/or the second window 12 may be constituted by providing a light-transmitting member in an opening of the housing 1, or a partial region of a light-transmitting material may be colored, and the partial region (at 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 in a direction perpendicular to the housing 1 or the circuit substrate 23, the light-emitting surface of the light source 21 has a square shape, and the active surface of the photodetector 22 also has a square shape. Correspondingly, in the above-described plan view, the shape (cross-sectional shape) of both the first window 11 and the second window 12 is also square. In order to facilitate the incidence of light from the light source 21 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 face of the light source 21. In order to be able to collect the light efficiently that has passed through the tissue TI of the living being, the size of the cross-section of the second window 12 is slightly larger than the size of the active face of the photodetector 22. Further, in the above-described plan view, with reference to a straight 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 first window 11 is formed to have a shape symmetrical with respect to the straight line, and the second window 12 is also formed to have a shape symmetrical with respect to the straight line. This layout is advantageous for performing the machining assembly and ensuring the sensing effect and the like. It is to be understood that the light source 21 and the light blocking member 24 are illustrated in fig. 2A for the purpose of facilitating understanding. In an actual product or design, the light source 21 and the flag 24 may be hidden from view by the housing 1 in the viewing angle of fig. 2A.

As shown in fig. 2A and 2B, the first window 11 has a first central axis along its extending direction, which does not pass through the center of the light emitting face of the light source 21. The first window 11 is offset a distance with respect to the light source 21 in a direction away from the photodetector 22 and the second window 12. The second window 12 has a second central axis along its extension, which passes through the center of the active face 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 via the first window 11 needs to be transmitted to the second window 12 via the arc-shaped propagation path, once the minimum distance between the first window 11 and the second window 12 is increased, the radius of curvature of the arc-shaped propagation path is increased, so that the light can be incident into a deeper portion in the tissue TI, which equivalently increases the distance between the light source 21 and the photodetector 22 in the field of measuring pulse waves. Therefore, the blood vessel volume and the blood perfusion rate on the light propagation path are large enough, the ratio of the alternating current AC signal and the direct current DC signal converted from the light signal captured by the photoelectric detector 22 is good, and the signal-to-noise ratio is high under the same module dynamic range.

In the present embodiment, as shown in fig. 2B, the first light guide 31 is located in the housing 1, and the first light guide 31 is installed at a portion of the housing 1 where the first window 11 is formed, and is used for guiding the light from the light source 21 toward the first window 11. The first light guide 31 extends from the light source 21 toward the first window 11 so that light from the light source 21 can be smoothly incident into the tissue TI of the living body via the first window 11. The first light guide 31 may be a hollow tube structure made of glass or plastic, and an inner surface or an outer surface of the first light guide 31 may be coated or plated with a reflective film, which may be a metal film or a dielectric film, whereby the first light guide 31 may guide light from the light source 21 into the tissue TI of the living body using the principle of total reflection to increase the amount of light transmitted into the tissue TI of the living body via the first window 11.

A specific configuration of an electronic terminal device having a function of measuring a pulse wave according to a second embodiment of the present application is explained below with reference to the drawings.

(concrete constitution of electronic terminal device having function of measuring pulse wave according to second embodiment of the present application)

The overall configuration of the electronic terminal device with a function of measuring pulse waves according to the second embodiment of the present application is substantially the same as that of the electronic terminal device with a function of measuring pulse waves according to the first embodiment of the present application, and the differences therebetween will be mainly explained below.

As shown in fig. 3A and 3B, the first window 11 has a first central axis along its extending direction, the first central axis passing through the center of the light emitting face of the light source 21. The second window 12 has a second central axis along its extension which does not pass through the center of the active face of the photodetector 22. The second window 12 is displaced a distance with respect to the photodetector 22 towards a direction away from the light source 21 and the first window 11. Thus, as in the first embodiment, the distance between the light source 21 and the photodetector 22 is equivalently increased. Thus, the blood vessel volume and the blood perfusion rate in the path of the light propagation are sufficiently large, so that 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 ratio is high at the same module dynamic range. In addition, due to the offset between the second window 12 and the photodetector 22, when the portion of the electronic terminal device where the pulse wave detection component is disposed is separated from the skin, the skin reflection crosstalk that can be incident into the second window 12 needs to have a very large inclination angle, which actually causes the skin reflection crosstalk to be not easily reflected into the second window 12, thereby reducing the adverse effect of the skin reflection light on the sensing result of the pulse wave sensing component 2.

A specific configuration of an electronic terminal device having a function of measuring a pulse wave according to a third embodiment of the present application is explained below with reference to the drawings.

(concrete constitution of electronic terminal device having function of measuring pulse wave according to third embodiment of the present application)

The overall configuration of the electronic terminal device with a function of measuring pulse waves according to the third embodiment of the present application is substantially the same as that of the electronic terminal device with a function of measuring pulse waves according to the second embodiment of the present application, and the differences therebetween will be mainly explained below.

In this embodiment, as shown in fig. 4, the electronic terminal device further includes a second light guide 32. The second light guide 32 is located in the housing 1, and the second light guide 32 is installed at a portion of the housing 1 where the second window 12 is formed, for conducting light passing through the second window 12 to the active surface of the photodetector 22. A second light guide 32 extends from the first window 11 towards the photodetector 22 such that light passing through the second window 12 is conducted to the active face of the photodetector 22. The second light guide 32 may be a hollow tube structure made of glass or plastic, an inner surface or an outer surface of the second light guide 32 may be coated or plated with a reflective film, and the reflective film may be a metal film or a dielectric film, so that the second light guide 32 may conduct light passing through the second window 12 to an active surface of the photodetector 22 by using a total reflection principle. In this way, losses in the conduction of light via the second window 12 to the active face of the photodetector 22 can be reduced.

It is understood that in the embodiment shown in fig. 2A and 4, the first light guide 31 and/or the second light guide 32 may also be mounted or connected to the pulse wave sensing assembly 2, for example, to the circuit substrate 3. Optionally, the first light guide 31 and/or the second light guide 32 may also be mounted or connected to both the housing 1 and the pulse wave sensing assembly 2.

A specific configuration of an electronic terminal device having a function of measuring a pulse wave according to a fourth embodiment of the present application is explained below with reference to the drawings.

(concrete constitution of electronic terminal device having function of measuring pulse wave according to fourth embodiment of the present application)

The overall configuration of the electronic terminal device with a pulse wave measuring function according to the fourth embodiment of the present application is substantially the same as that of the electronic terminal device with a pulse wave measuring function according to the second embodiment of the present application, and the difference therebetween will be mainly explained below.

In this embodiment, as shown in fig. 5A, the electronic terminal device further includes a second light guide 32'. The second light guide 32 'is located in the housing 1, and the second light guide 32' is installed at a portion of the housing 1 where the second window 12 is formed, for conducting light passing through the second window 12 to the active surface of the photodetector 22. A 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' is integrally formed by a solid light guide film, and the outer surface of the second light guide member 32' may be coated or plated with a reflective film, which may be a metal film or a dielectric film, so that 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 using the total reflection principle. Further, a portion of second light guide 32' opposite to second window 12 forms incident portion 321', which incident portion 321' may be a partial surface from which the reflective film is removed. In addition, the second light guide 32' has an emission portion 322' formed at a portion facing the active surface of the photodetector 22, and the emission portion 322' may be a partial surface from which the reflective film is removed, or may be a microstructure formed using a lens array. Such microstructures may be embossed or otherwise formed in the light guide 32 'to facilitate the conduction of light conducted via the second light guide 32' to the photodetector 22.

Further, in a modification of the electronic terminal device having a function of measuring a pulse wave according to the fourth embodiment of the present application, as shown in fig. 5C, another emission part 322 ″ may be formed at a portion of the second light guide 32 ″ opposite to the active surface of the photodetector 22, the emission part 322 ″ being a micro-structure formed using a prism array. This microstructure can exhibit the same effect as the microstructure shown in fig. 5B.

A specific configuration of an electronic terminal device having a function of measuring a pulse wave according to a fifth embodiment of the present application is explained below with reference to the drawings.

(concrete constitution of electronic terminal device having function of measuring pulse wave according to fifth embodiment of the present application)

The overall configuration of the electronic terminal device with a pulse wave measuring function according to the fifth embodiment of the present application is substantially the same as that of the electronic terminal device with a pulse wave measuring function according to the second embodiment of the present application, and the differences therebetween will be mainly explained below.

In the present embodiment, as shown in fig. 6, the second window 12 is shaped as a part of a circular ring. The second window 12 forms a concave shape opposite to the photodetector 22 in a plan view. The lateral dimensions of such a second window 12 may be larger compared to the square-shaped second window 12 in the above embodiments, which is advantageous for increasing the ability to collect light passing through the tissue TI of the living being.

In addition, in the present 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 a top view as shown in fig. 6, the minimum distance between the center of the first window 11 and the edge of the second window 12 is larger than the distance between the center of the light source 21 and the center of the photodetector 22. In this way, the effects of the aspects of the present application can be more effectively exhibited.

A specific configuration of an electronic terminal device having a function of measuring a pulse wave according to a sixth embodiment of the present application is explained below with reference to the drawings.

(concrete constitution of electronic terminal device having function of measuring pulse wave according to sixth embodiment of the present application)

An aspect of an electronic terminal device having a function of measuring pulse waves according to a sixth embodiment of the present application is formed by combining the aspects of the first embodiment and the second embodiment. Specifically, as shown in fig. 7, similarly to 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 is displaced from the light source 21 toward a direction away from the second window 12 and the photodetector 22. As in 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 is offset from the photodetector 22 in a direction away from the first window 11 and the light source 21. Thus, 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, and compared with the first embodiment and the second embodiment, the distance between the light source 21 and the photosensor is further increased equivalently, and the beneficial effects of the present application can be better exerted. However, in this embodiment, it is necessary to ensure that an increase in the distance between the first window 11 and the second window 12 does not affect the operating state of the light source 21 and the photodetector 22.

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

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

According to the electronic terminal equipment who has the function of measuring pulse wave of this application mainly be wearable equipment on the human body, like the electronic terminal equipment of earphone, intelligent wrist-watch and bracelet etc.. When the device is worn by a user, the device can be automatically started to detect a PPG signal of a human body, so that physiological parameters of the human body such as a dynamic heart rate, blood oxygen saturation and the like can be acquired. As shown in fig. 8, the electronic terminal device uses a processor as a center, and is externally connected with modules such as a memory, a display (optional), a sensor, a communication module, and a PPG module. The processor executes the program instructions to complete control, management and signal processing of the whole system, particularly to acquire signals from the PPG module, and various physiological parameters are obtained after processing. The memory stores program instructions and data needed during program execution. The display is used for providing a man-machine interaction interface, presenting various information to a user and realizing touch input through touch operation. The sensors include accelerometers, gyroscopes, ambient light sensors, etc. to sense the environment in which the system is located and the state of motion of the system itself. The communication module has wireless communication functions of WiFi, bluetooth and the like and is used for transmitting data to other electronic terminal equipment such as a mobile phone and the like or receiving commands. The PPG module is used for detecting physiological parameters such as the heart rate of a user and the like, and then transmits the physiological parameters to the processor for further processing.

The foregoing is illustrative of exemplary embodiments of the present application and additional description is provided below.

i. Although it is described in the above specific embodiment that the electronic terminal device is an earphone, a watch, a bracelet, or the like, the present application is not limited thereto. The electronic terminal device may be various electronic terminal devices that come into contact with the skin of a living body (e.g., a human body) when in use, and is not limited to the example described in the above specific embodiment.

While it is explained in the above specific embodiment that the cross-sectional shape of the first window 11 is formed in a square shape and the cross-sectional shape of the second window 12 is formed in a square shape or a portion of a circular ring, 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 may be formed in any shape as needed, and may also be formed in a rectangular shape, an oval shape, or a diamond shape, for example.

it is explained in the above first to fourth embodiments that the minimum distance between the first window 11 and the second window 12 is larger than the minimum distance between the light source 21 and the photodetector 22, but in order to equivalently increase the distance between the light source 21 and the photodetector 22 by further increasing the distance between the first window 11 and the second window 12, the minimum distance between the first window 11 and the second window 12 may be made larger than the maximum distance between the light source 21 and the photodetector 22 as in the sixth embodiment. For example, alternatively, assuming that 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: l1 is more than or equal to 1mm and less than or equal to 4mm, and L2-L1 is more than or equal to 1 mm. In addition, let the distance between the center of the light source 21 and the center of the photodetector 22 be L3, further alternatively, L1< L3 ≦ 5mm and 1mm <L2-L3.

Although the shape of the first window 11 is formed to be symmetrical with respect to a 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 with reference to the straight line in the above specific embodiment, the present application is not limited thereto. In fact, the first window 11 and the second window 12 may be asymmetrically shaped with respect to the above-mentioned line, even if the first window 11 is located only on one side of the above-mentioned line and/or the second window 12 is located only on the other side of the above-mentioned line. This allows the first window 11 and the light source 21 to be laterally offset. The second window 12 can be laterally offset from the photodetector 22, whereby it can further be avoided that reflected light of the skin is undesirably conducted via the second window 12 to the photodetector 22.

v. although it is explained 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 thereto, and the first central axis and the second central axis may be inclined at a certain angle with respect to the housing 1.

While the present application has been described in connection with various embodiments, other variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed application, from a review of the drawings, the disclosure, and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the word "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 a combination of these measures cannot be used to advantage.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many 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 is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An electronic terminal device with a function of measuring pulse waves comprises a shell, a light source, a photoelectric detector and a circuit substrate, wherein the light source, the photoelectric detector and the circuit substrate are positioned in the shell and fixed relative to the shell, the light source and the photoelectric detector are arranged on the circuit substrate,

a first window through which light from the light source passes to be incident into a tissue of the living body and a second window through which light passing through the tissue returns to be captured by the photodetector to measure a pulse wave are formed at a portion of the housing for contact with the living body,

2. The electronic terminal device with a function of measuring pulse waves according to claim 1, wherein a minimum distance between the first window and the second window is greater than a maximum distance between the light source and the photodetector.

3. The electronic terminal device with a function of measuring pulse waves according to claim 1, wherein a minimum distance between the light source and the photodetector is L1, and a minimum distance between the first window and the second window is L2, then:

l1 is more than or equal to 1mm and less than or equal to 4mm, and

1mm≤L2-L1。

4. the electronic terminal device with a function of measuring pulse waves according to any one of claims 1 to 3, characterized in that, in a plan view viewed in a direction perpendicular to the housing or the circuit substrate, with reference to a straight line connecting a center of a light emitting face of the light source and a center of an active face of the photodetector,

5. The electronic terminal device having a function of measuring pulse waves according to claim 4, wherein the first window has a first central axis along an extending direction thereof, the first central axis passing through a center of a light emitting face of the light source.

6. The electronic terminal device with a function of measuring pulse waves according to claim 4, wherein the second window has a second central axis along its extending direction, the second central axis passing through a center of an active face of the photodetector.

7. The electronic terminal device with pulse wave measuring function according to any one of claims 1 to 3, further comprising a first light guide member located inside the housing, the first light guide member being installed at a portion of the housing where the first window is formed, for guiding light from the light source toward the first window.

8. The electronic terminal device with a function of measuring pulse waves according to claim 7, wherein the first light guide extends from the light source toward the first window.

9. The electronic terminal device having a function of measuring pulse waves according to claim 8, wherein the interior of the first light guide member forms a hollow channel, and the side wall of the hollow channel is coated or plated with a reflective film.

10. The electronic terminal device with pulse wave measuring function of claim 8, wherein the first light guide member is a solid light guide film, and the outer surface of the light guide film except for the portion corresponding to the first window and the photodetector is coated or plated with a reflective film.

11. The electronic terminal device with pulse wave measuring function of claim 10, wherein a lens array or a prism array is disposed on a portion of the outer surface of the light guiding film corresponding to the first window.

12. The electronic terminal device with pulse wave measuring function according to any one of claims 1 to 3, further comprising a second light guide member located inside the housing, the second light guide member being installed at a portion of the housing where the second window is formed, for guiding light passing through the second window toward the photodetector.

13. The electronic terminal device with a function of measuring pulse waves according to claim 12, wherein the second light guide extends from the second window toward the photodetector.

14. The electronic terminal device with a function of measuring pulse waves according to claim 13, wherein the interior of the second light guide member forms a hollow channel, and the side wall of the hollow channel is coated or plated with a reflective film.

15. The electronic terminal device with pulse wave measuring function of claim 13, wherein the second light guide member is a solid light guide film, and the outer surface of the light guide film except for the portion corresponding to the second window and the photodetector is coated or plated with a reflective film.

16. The electronic terminal device with a function of measuring pulse waves according to claim 15, wherein a portion of the outer surface of the light guiding film corresponding to the photodetector is provided with a lens array or a prism array.

17. The electronic terminal device having a function of measuring pulse waves according to any one of claims 1 to 3, characterized in that the cross-sectional shape of the first window and the cross-sectional shape of the second window are formed as a portion of a circular ring, a square, a rectangle, an ellipse, or a diamond.

18. The electronic terminal device with function of measuring pulse waves according to any one of claims 1 to 3, further comprising a light barrier disposed between the light source and the photodetector for blocking direct conduction of light from the light source to the photodetector.

19. The electronic terminal device with function of measuring pulse waves according to any one of claims 1 to 3, wherein the electronic terminal device is an earphone, a watch or a bracelet.