Wearable device

Abstract

The application discloses a wearable device, which comprises a main shell, a back cover, a light emitting device and a photoelectric sensor. The back cover is connected with the main shell and forms a containing space together with the main shell. The light emitting device and the photoelectric sensor are arranged in the containing space. The light emitting device is used for emitting light outward, and the photoelectric sensor is used for receiving reflected light signals from the outside. The back cover has an outer surface facing away from the containing space. The outer surface comprises a first area and a second area located at the periphery of the first area. The projection of the light emitting device on the outer surface is located in the first area, and the projection of the photoelectric sensor on the outer surface is located in the second area. The second area is formed with a first light blocking structure. The first light blocking structure is used for forming the second area into a non-flat surface to block light reflected to the photoelectric sensor through the back cover. The wearable device of the application can effectively solve the problem of light interference between the light emitting device and the photoelectric sensor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wearable devices, and in particular to a wearable device. BACKGROUND

[0002] Photo ploethysmo graph (PPG) is a detection of human heart rate movement, which can detect the difference of reflected light intensity after the absorption of human blood and tissue, and record the change of blood vessel volume in the cardiac cycle, so as to calculate the heart rate from the obtained pulse waveform. PPG technology is an application of infrared nondestructive testing technology in biomedicine.

[0003] At present, the wearable device (such as smart watch, smart bracelet) is provided with a light emitting device and a photoelectric sensor, the light emitting device emits light to the human body, and the photoelectric sensor detects the reflected light after the absorption of human blood and tissue, so as to detect the heart rate change of the wearer, thereby realizing the detection of the heart rate of the wearer.

[0004] However, in the related art, the light emitting device and the photoelectric sensor need to be arranged within a certain distance, and the back cover of the wearable device for arranging the light emitting device and the photoelectric sensor is mostly a light-transmitting back cover. Thus, the light emitted by the light emitting device is easily directly conducted to the photoelectric sensor due to the light-transmitting effect of the back cover during the emission process, that is, the light emitted by the light emitting device is directly absorbed by the photoelectric sensor without passing through the wearer, resulting in light cross between the light emitting device and the photoelectric sensor, and affecting the heart rate detection accuracy. SUMMARY

[0005] The embodiments of the present application disclose a wearable device, which can effectively solve the problem of light cross between the light emitting device and the photoelectric sensor, and improve the heart rate detection accuracy.

[0006] In order to achieve the above purpose, the present application discloses a wearable device, which comprises a main shell, a back cover, a light emitting device and a photoelectric sensor.

[0007] The back cover is connected with the main shell and forms a containing space with the main shell, the light emitting device and the photoelectric sensor are arranged in the containing space, the light emitting device is used for emitting light outward, and the photoelectric sensor is used for receiving reflected light signal from outside.

[0008] The back cover has an outer surface facing away from the accommodating space, the outer surface comprises a first region and a second region located at the periphery of the first region, a projection of the light emitting device on the outer surface is located in the first region, a projection of the photoelectric sensor on the outer surface is located in the second region, the second region is formed with a first light blocking structure, and the first light blocking structure is used to form the second region into a non-flat surface to block light reflected to the photoelectric sensor through the back cover.

[0009] Compared with the prior art, the application has the beneficial effects that:

[0010] The wearable device provided by the application forms the first light blocking structure on the second region of the outer surface of the back cover, uses the first light blocking structure to form the second region into a non-flat surface, and due to the arrangement of the non-flat surface, the exit angle of the light can be changed when the light passes through the non-flat surface, thereby reducing the probability of total reflection of the light on the back cover. In other words, by arranging the first light blocking structure, the light emitted by the light emitting device can be effectively blocked from being reflected to the photoelectric sensor without being absorbed by the human skin, that is, the problem of light cross-talk between the light emitting device and the photoelectric sensor is effectively solved, and the heart rate detection accuracy of the wearable device is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0012] Figure 1 is a structure diagram of a wearable device in the related art in which light cross-talk occurs;

[0013] Figure 2 is a first structure diagram of a wearable device disclosed by the embodiments of the application;

[0014] Figure 3 is Figure 2 is a top view of the outer surface of the back cover in

[0015] Figure 4A is a structure diagram of a wearable device disclosed by the embodiments of the application when the photoelectric sensor is multiple;

[0016] Figure 4B is a second structure diagram of a wearable device disclosed by the embodiments of the application;

[0017] Figure 4C is a third structure diagram of a wearable device disclosed by the embodiments of the application;

[0018] Figure 5 is a structural schematic diagram of a first light blocking structure disclosed by embodiments of the present application;

[0019] Figure 6 is a cross-sectional schematic diagram of the first light blocking structure disclosed by embodiments of the present application;

[0020] Figure 7 is a schematic diagram of the first light energy blocking structure being a corrugated structure disclosed by embodiments of the present application;

[0021] Figure 8 is a fourth structural schematic diagram of a wearable device disclosed by embodiments of the present application;

[0022] Figure 9 is a top view schematic diagram of an outer surface of a back cover in Figure 8

[0023] Figure 10 is a partial structural block diagram of a wearable device disclosed by embodiments of the present application;

[0024] Figure 11 is a fifth structural schematic diagram of a wearable device disclosed by embodiments of the present application;

[0025] Figure 12 is a sixth structural schematic diagram of a wearable device disclosed by embodiments of the present application;

[0026] Figure 13 is a seventh structural schematic diagram of a wearable device disclosed by embodiments of the present application. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0028] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0029] ​Moreover, the aforementioned partial terms can be used to represent other meanings in addition to the orientation or positional relationship, for example, the term "upper" can also be used to represent a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0030] In addition, the terms "mount", "set", "provided with", "connected", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally configured; it can be mechanically connected or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0031] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and configurations can be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0032] In the related art, the detection of human heart rate and blood oxygen by the wearable device 1 (such as a smart watch or a smart bracelet) is realized by PPG (photo ploethysmograph, photo plethysmography), which mainly includes a light emitting device 2 and a photoelectric sensor 3. When worn, ideally, the light emitted by the light emitting device 2 is reflected after passing through the wrist skin tissue and is received by the photoelectric sensor 3. This part of the light signal is a useful light signal. However, due to the wearing method and the material design of the back cover 1a of the wearable device 1, part of the light emitted by the light emitting device 2 is directly absorbed by the photoelectric sensor 3 without passing through the skin tissue, resulting in a decrease in the relative intensity of the useful signal. Specifically, as shown in Figure 1 , Figure 1 Since the Fresnel lens 1b for focusing is arranged at the window corresponding to the light emitting device 2 of the back cover 1a, when the light emitting device 2 emits light, the light rays will form an included angle with the surface of the back cover 1a, resulting in total reflection. This part of the totally reflected light is scattered due to impurities in the material (such as glass) of the back cover 1a during propagation, and is directly received by the photoelectric sensor 3, forming a useless light signal. As Figure 1As shown, the light ray L is a light ray emitted by the light emitting device 2 without passing through the wrist skin tissue, that is, the light ray L is a light ray emitted by the light emitting device 2 and directly reflected to the photoelectric sensor 3 through the back cover 1a. Since the light ray L is directly reflected to the photoelectric sensor 3, crosstalk occurs between the light emitting device 2 and the photoelectric sensor 3, which affects the light ray emitted by the light emitting device 2 to the wrist skin tissue in this case. As a result, the useful light signal is reduced, which affects the detection accuracy of the human heart rate and blood oxygen.

[0033] Based on this, the embodiment of the present application discloses a wearable device. The wearable device sets a first light blocking structure on the outer surface of the back cover. The first light blocking structure makes the outer surface of the back cover at least partially form a non-flat surface. The non-flat surface can reduce the probability of total reflection of light rays, thereby blocking the light rays emitted by the light emitting device and directly reflected to the photoelectric sensor through the back cover.

[0034] The technical solutions disclosed in the embodiments of the present application will be described in detail below with reference to the drawings.

[0035] Please refer to Figure 2 and Figure 3 , Figure 2 is a first structure schematic diagram of the wearable device disclosed in the embodiments of the present application, Figure 3 is Figure 2 the outer surface structure schematic diagram of the back cover in the wearable device. The wearable device 100 disclosed in the embodiments of the present application includes a main shell 10, a back cover 20, a light emitting device 30, and a photoelectric sensor 40. The back cover 20 is connected with the main shell 10 and forms a containing space 10a together with the main shell 10. The light emitting device 30 and the photoelectric sensor 40 are arranged in the containing space 10a. The light emitting device 30 can be used to emit light rays outward, and the photoelectric sensor 40 is used to receive the reflected light signals from the outside, thereby realizing the detection of the human heart rate and blood oxygen. The back cover 20 has an outer surface 21 facing away from the containing space 10a. The outer surface 21 includes a first area 21a and a second area 21b located at the outer periphery of the first area 21a. The projection of the light emitting device 30 on the outer surface 21 is located in the first area 21a. The projection of the photoelectric sensor 40 on the outer surface 21 is located in the second area 21b. The second area 21b is formed with a first light blocking structure 210. The first light blocking structure 210 makes the second area 21b form a non-flat surface. The first light blocking structure 210 is used to block the light rays reflected to the photoelectric sensor 40 through the back cover 20.

[0036] It can be understood that the first light blocking structure 210 is formed on the second region 21b means that the first light blocking structure 210 is integrally formed with the second region 21b, that is, when the second region 21b is formed, the first light blocking structure 210 can be formed on the second region 21b, so that the second region 21b is formed as a non-flat surface.

[0037] The embodiment of the present application forms the first light blocking structure 210 on the second region 21b of the rear cover 20, and uses the first light blocking structure 210 to form the second region 21b as a non-flat surface, so that when light is incident on the non-flat surface, the angle of the light exiting the non-flat surface can be changed, thereby reducing the probability of total reflection of the light on the rear cover 20 to the photoelectric sensor 40, so that the light L1 can be directly emitted to the outside, thereby blocking the light directly reflected to the photoelectric sensor 40 through the rear cover 20, effectively solving the problem of affecting the detection accuracy of the photoelectric sensor 40 on the human body's blood oxygen and heart rate due to the occurrence of light between the light emitting device 30 and the photoelectric sensor 40. For example, as shown in Figure 2 , it can be seen that after the light L1 is emitted by the light emitting device 30, due to the presence of the first light blocking structure 210, the light L1 can be directly emitted, thereby not only increasing the light emitted to the outside to improve the detection accuracy, but also preventing the occurrence of light between the light emitting device 30 and the photoelectric sensor 40. Figure 2

[0038] In some embodiments, the wearable device 100 can include but is not limited to a smart watch, a smart bracelet and the like, so that when the user wears the smart watch or the smart bracelet, the heart rate and blood oxygen detection functions can be realized.

[0039] Taking the wearable device 100 as a smart watch as an example, the main shell 10 can be a watch shell of the smart watch, and the rear cover 20 can be a rear shell of the smart watch. When the smart watch is worn on the human wrist, the rear cover 20 can be arranged towards the human wrist skin or directly attached to the human wrist skin.

[0040] Further, in order to improve the universality of the rear cover 20 and improve the appearance decoration effect of the smart watch, the rear cover 20 can be a glass rear cover, a plastic rear cover or a ceramic rear cover, as long as it can realize light transmission, which is not limited in the embodiment.

[0041] In some embodiments, the photoelectric sensor 40 can be one or more. When the photoelectric sensor 40 is one, the photoelectric sensor 40 is arranged apart from the light emitting device 30, as shown in Figure 2 . When the photoelectric sensor 40 is multiple, as shown in Figure 4A , the photoelectric sensor 40 can be arranged in a row or in a matrix. Figure 4A ​is a structure diagram of the photoelectric sensor of the wearable device disclosed in the embodiments of the present application when the photoelectric sensor is multiple. For example, when the photoelectric sensor 40 is two, the two photoelectric sensors 40 can be arranged symmetrically with the light emitting device 30 as the center, as shown in Figure 4B , Figure 4B is a second structure diagram of the wearable device disclosed in the embodiments of the present application, Figure 4B is shown in the second structure diagram, when the photoelectric sensor 40 is two, the first light blocking structure 210 is arranged between the two photoelectric sensors 40 and the light emitting device 30. When the photoelectric sensor 40 is three or more, the three or more photoelectric sensors 40 can be arranged in a ring shape with the light emitting device 30 as the center, as shown in Figure 4C , Figure 4C is a third structure diagram of the wearable device disclosed in the embodiments of the present application, Figure 4C is shown in the third structure diagram, the first light blocking structure 210 formed between the three photoelectric sensors 30 is a ring shape. At this time, the second region 21b can be a ring-shaped region arranged outside the first region 21a with the light emitting device 30 as the center. In this way, the first light blocking structure 210 arranged in the second region 21b can be arranged in a ring shape with the light emitting device 30 as the center, so that the first light blocking structure 210 can realize the light cross-talk of the multiple photoelectric sensors 40 and the light emitting device 30.

[0042] It is worth noting that considering that the first light blocking structure 210 is formed in the second region 21b, the first light blocking structure 210 can extend in the direction away from the light emitting device 30 along the second region 21b with the light emitting device 30 as the center, that is, when the first light blocking structure 210 is arranged in a ring shape with the light emitting device 30 as the center, the first light blocking structure 210 can be formed as one or more rings.

[0043] Further, when the first light blocking structure 210 is formed in the second region 21b, it can include a protruding structure protruding from the outer surface 21 and / or a recessed structure recessed from the outer surface 21. For example, the first light blocking structure 210 can be a protruding structure protruding from the outer surface 21 (as shown in a of Figure 5 , Figure 5 a of which shows that the first light blocking structure 210 is a protruding structure), or the first light blocking structure 210 can be a recessed structure recessed from the outer surface 21 (as shown in b of Figure 5 , Figure 5 b of which shows that the first light blocking structure 210 is a recessed structure). Or, the first light blocking structure 210 can include a protruding structure protruding from the outer surface 21 and a recessed structure recessed from the outer surface 21 (as shown in c of Figure 5 , Figure 5The first light blocking structure 210 can include both protruding structures and recessed structures. As shown in FIG. 2c, the first light blocking structure 210 includes both protruding structures and recessed structures. In this way, the second region 21b of the outer surface 21 can be formed as a non-flat surface, which can change the incident and exit angles of the light, thereby blocking the direct reflection of the light to the photosensor 40 and preventing the occurrence of cross talk between the light emitting device 30 and the photosensor 40.

[0044] In an alternative embodiment, when the first light blocking structure 210 includes protruding structures, the protruding structures can be formed between the light emitting device 30 and the photosensor 40. The protruding structures can be arranged around the center of the light emitting device 30, for example, one round, half round, or one third round, as long as the protruding structures can block the light reflected by the back cover. The present embodiment is not limited in this regard. As such, the protruding structures can be formed at a partial position of the second region 21b, for example, the protruding structures can be formed at a position between the projection of the photosensor 40 and the light emitting device 30 on the second region 21b, or the protruding structures can be formed at the entire second region 21b, so that the projection of the photosensor 40 on the second region 21b can correspond to the arrangement of the protruding structures.

[0045] Alternatively, the protruding structures can be one or more. When the protruding structures are more than one, the protruding structures can be formed at intervals or continuously on the second region 21b.

[0046] Similarly, when the first light blocking structure includes recessed structures, the arrangement and formation position of the recessed structures can refer to the arrangement and formation position of the protruding structures, which will not be described herein.

[0047] In another alternative embodiment, when the first light blocking structure 210 includes both protruding structures and recessed structures, each recessed structure is located between two adjacent protruding structures. That is, a recessed structure is formed between two adjacent protruding structures. The first light blocking structure 210 can be formed at the entire second region 21b, or can be formed at a partial position of the second region 21b, for example, can be formed only between the light emitting device 30, the photosensor 40, and the projection of the second region 21b.

[0048] When the first light blocking structure 210 is formed at the entire second region 21b, the projection of the photosensor 40 on the second region 21b can be located at the recessed structure or the protruding structure.

[0049] Therefore, as long as the first light blocking structure 210 is formed on the second area 21b, the first light blocking structure 210 includes the protruding structure and / or the recessed structure, so that the second area 21b is formed as a non-flat surface, thereby the light emitted by the light emitting device 30 can reduce the exit angle of the light due to the existence of the protruding structure and / or the recessed structure when the light passes through the second area 21b, thereby effectively blocking the direct reflection of the light to the photoelectric sensor 40, and further preventing the cross light between the light emitting device 30 and the photoelectric sensor 40.

[0050] In other words, regardless of whether the first light blocking structure 210 includes the protruding structure and / or the recessed structure, when the first light blocking structure 210 is formed on the second area 21b, the first light blocking structure 210 can be formed between the light emitting device 30 and the photoelectric sensor 40 (for example, as shown in Figure 2 ), or the first light blocking structure 210 can extend from between the light emitting device 30 and the photoelectric sensor 40 to the position where the projection of the photoelectric sensor 40 on the second area 21b (for example, as shown in Figure 8 ). As long as the first light blocking structure 210 can be formed between the light emitting device 30 and the photoelectric sensor 40 to achieve light blocking, the present embodiment does not make specific limitations thereto.

[0051] It can be understood that the higher the height of the protruding structure protruding from the second area 21b or the greater the depth of the recessed structure recessed in the second area 21b, the better the effect of reducing the exit angle of the light, that is, the better the effect of blocking the direct reflection of the light to the photoelectric sensor 40. However, since the height of the protruding structure protruding from the second area 21b is too high, it will affect the wearing comfort of the wearable device 100, so the protruding height of the protruding structure should be moderate, for example, it can be 0.1-1mm. For example, it can be 0.1mm, 0.3mm, 0.5mm, 0.7mm, 0.9mm, 1mm, etc. For the same reason, the greater the recess depth of the recessed structure, the greater the compression of the accommodation space 10a formed between the back cover 20 and the main shell 10, and at the same time, it also has an impact on the local structural strength of the back cover 20, so the recess depth of the recessed structure can be set according to the protruding height of the protruding structure described above.

[0052] As shown in Figure 6 , the cross-sectional view of the first light blocking structure 210 disclosed in the embodiments of the present application is shown in Figure 6 , in some embodiments, the shape of the first light blocking structure 210 obtained by being cut along a plane perpendicular to the outer surface 21 can be arc-shaped (as shown in a of Figure 6 ), zigzag-shaped (as shown in b of Figure 6 ) or square-shaped (as shown in c of Figure 6At least one of the following (as shown in c) can be used to create a first light-blocking structure 210 with different shapes to meet different requirements. For example, the shape of the first light-blocking structure 210 cut along a plane perpendicular to the outer surface 21 can be arc-shaped or a combination of arc-shaped and sawtooth or square shapes. Considering that the first light-blocking structure 210 is formed on the outer surface 21 of the back cover 20, when the wearable device 100 is a smartwatch worn on the human wrist, the outer surface 21 of the back cover 20 is mainly used to contact the skin of the wrist. Therefore, the shape of the first light-blocking structure 210 cut along a plane perpendicular to the outer surface 21 can be arc-shaped, making the outer periphery of the first light-blocking structure 210 smoother and preventing injury to the skin of the human wrist.

[0053] In some embodiments, considering that the first light-blocking structure 210 is formed on the outer surface 21 of the back cover 20, in order to prevent skin irritation to the wrist during wear and to improve the aesthetic appearance of the back cover 20, the first light-blocking structure 210 may be a corrugated structure formed in the second region 21b. For example, to facilitate molding and further improve the aesthetic appearance, the first light-blocking structure 210 may be a water ripple structure formed in the second region 21b, and the waveform of the first light-blocking structure 210 intercepted along a plane perpendicular to the outer surface 21 of the back cover 20 is a sine wave or a cosine wave.

[0054] Furthermore, considering that in related technologies, the center-to-center distance L between the photoelectric sensor 40 and the light-emitting device 30 is generally 4.5mm to 6mm, and when the back cover 20 is made of glass, its thickness s is 0.5mm to 1.5mm. The refractive index n of the glass material is 1.51, meaning that total internal reflection will occur when the exit angle of light in the glass back cover 20 is greater than 41°. Light emanating from the light-emitting device 30 and reaching the photoelectric sensor 40 undergoes at least one reflection; the fewer the reflections and the larger the exit angle, the greater the likelihood of total internal reflection. For example, light can reach the photoelectric sensor 40 after one total internal reflection, at which point the exit angle α0 = 50°. When the exit angle α0 < 50°, the light will directly pass over the photoelectric sensor 40, avoiding direct contact. Therefore, if the incident angle of light between 40° and 50° can be reduced to below 40°, light can exit directly from the glass back cover 20 instead of being reflected onto the photoelectric sensor 40. Based on this, the parameters of the first light-blocking structure 210 with a corrugated structure were designed in this embodiment as follows:

[0055] Considering that the space on the outer surface 21 of the back cover 20 is limited, and the first light blocking structure 210 is located in the second region 21b, that is, the space in the second region 21b is also limited, when the first light blocking structure 210 adopts a corrugated structure, the period of the corrugated structure can be 1-3.

[0056] As shown in Figure 7 Figure 7 The first light blocking structure is shown as a corrugated structure. Further, the first light blocking structure 210 can include a plurality of interconnected wave crests 210a and wave troughs 210b, the distance d between two adjacent wave crests 210a can be 1mm-6mm, the distance b from the center of any wave crest 210a to the wave trough 210b adjacent to the wave crest 210a, the depth of the wave trough 210b is a, b / a≤8.1, and the angle a formed between the side of any wave crest 210a and the center of the wave crest 210a is >7°. By designing the above parameters, the exit angle a0 of the light can be adjusted, so that the exit angle is less than 40°, thereby avoiding the light emitted by the light emitting device 30 directly passing through the back cover 20 to be totally reflected, and further avoiding the problem of cross light between the light emitting device 30 and the photosensor 40.

[0057] For example, when the period is 1, the distance d between two adjacent wave crests 210a can be 4.5mm-6mm, the angle a formed between the side of any wave crest 210a and the center of the wave crest 210a can be greater than 10°, and at this time, the distance b from the center of any wave crest 210a to the wave trough 210b adjacent to the wave crest 210a and the depth of the wave trough 210b, i.e. b / a, is less than 5.6.

[0058] When the period is 2, the distance between two adjacent wave crests 210a is 2.2mm-3mm, the angle a formed between the side of any wave crest 210a and the center of the wave crest 210a can be greater than 8°, and at this time, the distance b from the center of any wave crest 210a to the wave trough 210b adjacent to the wave crest 210a and the depth of the wave trough 210b, i.e. b / a, is less than 7.1, at this time the anti-cross light effect between the photosensor 40 and the light emitting device 30 is better.

[0059] When the period is 3, the distance between two adjacent wave crests 210a is 1.5-2mm, the angle a formed between the side of any wave crest 210a and the center of the wave crest 210a can be greater than 7°, and at this time, the distance b from the center of any wave crest 210a to the wave trough 210b adjacent to the wave crest 210a and the depth of the wave trough 210b, i.e. b / a, is less than 8.1.

[0060] As can be seen, when the first light blocking structure 210 is a corrugated structure, by controlling the parameters of the wave crests 210a and wave troughs 210b of the first light blocking structure 210, the incident angle and exit angle of the light emitted by the light emitting device 30 can be changed, thereby reducing the probability of total reflection of the light on the back cover 20, and effectively solving the problem of cross light between the light emitting device 30 and the photosensor 40.

[0061] Please refer to​Figure 8 and Figure 9 , Figure 8 is a fourth structural schematic view of the wearable device disclosed in the embodiments of the present application, Figure 9 is Figure 8 is a schematic view of the outer surface of the back cover in the second region 21b. In some embodiments, the second region 21b includes a first sub-region 211 and a second sub-region 212, the projection of the photoelectric sensor 40 on the second region 21b is located in the first sub-region 211, and the second sub-region 212 is located between the first region 21a and the first sub-region 211. The first sub-region 211 and the second sub-region 212 are both formed with the first light blocking structure 210. In this way, when the first light blocking structure 210 is formed on the second region 21b, at least one wave trough 210b can be arranged in the first sub-region 211, and at least one wave crest 210a can be arranged in the second sub-region 212. In this way, the wave trough 210b is arranged corresponding to the first sub-region 211 of the photoelectric sensor 40. Since the wave crest 210a and the wave trough 210b are arranged adjacently, the light L1 can be directly emitted due to the existence of the wave crest 210a when the light L1 passes through the wave crest 210a, thereby avoiding the reflection of the light to the photoelectric sensor 40 and the occurrence of light cross-talk between the light emitting device 30 and the photoelectric sensor 40.

[0062] Further, in order to enable the photoelectric sensor 40 to receive the light reflected from the outside (for example, the skin of the wrist), the first sub-region 211 can be provided with a plurality of light transmission windows 211a, and the light transmission window 211a can be located at a position in the first sub-region 211 where the wave trough 210b is located. Each light transmission window 211a can be arranged corresponding to each photoelectric sensor 40, respectively. In this way, each photoelectric sensor 40 can receive the light reflected from the outside through the light transmission window 211a, thereby effectively enabling the photoelectric sensor 40 to receive the light. For example, as shown in Figure 9 , Figure 9 the circles shown by the thick dashed lines in FIG. 11 represent the wave trough 210b of the first light blocking structure 210, and Figure 9 the circles shown by the thick solid lines in FIG. 11 represent the wave crest 210a of the first light blocking structure 210, that is, there is a wave trough 210b between two adjacent wave crests 210a, and the light transmission window 211a is arranged at the position of the wave trough 210b. In other words, the light transmission window 211a extends from one wave crest 210a to another wave crest 210a among the two adjacent wave crests 210a.

[0063] Optionally, the light transmission window 211a can be a fan-shaped window, a square window, a circular window, etc., as long as the light can enter the photoelectric sensor 40 through the light transmission window 211a, which is not limited in the embodiments of the present application.

[0064] In addition, the setting position and size of the light-transmitting window 211a can be set according to the setting position of the photoelectric sensor 40 in the accommodating space 10a and the size of the photoelectric sensor 40, which are not specifically limited in the embodiment.

[0065] In some embodiments, in order to effectively prevent the problem of light cross between the photoelectric sensor 40 and the light-emitting device 30, the first area 21a can be formed with a second light-blocking structure 213. The second light-blocking structure 213 and the first light-blocking structure 210 are both corrugated structures extending from the first area 21a to the second area 21b with the light-emitting device 30 as the center, and the second light-blocking structure 213 is continuously arranged with the first light-blocking structure 210, and the light-emitting device 30 can be arranged corresponding to the peaks 210a of the first light-blocking structure 210. Since the first light-blocking structure 210 and the second light-blocking structure 213 are integrally formed in the first area 21a and the second area 21b, and the first light-blocking structure 210 and the second light-blocking structure 213 are continuously arranged as water corrugated structures, on the one hand, the appearance decoration effect of the back cover 20 can be effectively improved, and on the other hand, since the light-emitting device 30 is arranged corresponding to the peaks of the second light-blocking structure 213, and the photoelectric sensor 40 is arranged corresponding to the troughs 210b of the first light-blocking structure 210, the angle of the light emitted by the light-emitting device 30 can be changed, the probability of total reflection of the light on the back cover 20 is reduced, and the light cross between the light-emitting device 30 and the photoelectric sensor 40 is avoided.

[0066] Further, in actual setting, when the first light-blocking structure 210 and the second light-blocking structure 213 are formed on the back cover 20, the first light-blocking structure 210 and the second light-blocking structure 213 can be integrally formed, so that the forming process of the back cover 20 can be simplified.

[0067] In combination Figure 10 As shown in the figure, in some embodiments, the peaks 210a of the first light-blocking structure 210 and / or the peaks of the second light-blocking structure 213 are provided with a conductive layer 214, and the wearable device 100 can further include a temperature sensor 50 and / or an electrocardio sensor 60, and the conductive layer 214 is electrically connected with the temperature sensor 50 and / or the electrocardio sensor 60. In this way, since the peaks 210a of the first light-blocking structure 210 and the second light-blocking structure 213 are protrudingly formed in the second area 21b and the first area 21a, when the wearable device 100 is worn on the human wrist, the peaks can be directly in contact with the human wrist skin. When the conductive layer 214 is electrically connected with the temperature sensor 50 and / or the electrocardio sensor 60, the conductive layer 214 can be used as the conductive electrode of the temperature sensor 50 and / or the electrocardio sensor 60, so that the temperature sensor 50 and / or the electrocardio sensor 60 can be in better contact with the human wrist skin, which is conducive to improving the detection accuracy of the temperature sensor 50 and / or the electrocardio sensor 60.

[0068] Specifically, the conductive layer 214 can be arranged on the wave crest 210a of the first light blocking structure 210, or on the wave crest of the second light blocking structure 213, or on both the wave crest 210a of the first light blocking structure 210 and the wave crest of the second light blocking structure 213. When the conductive layer 214 is arranged on the wave crest 210a of the first light blocking structure 210 or on the wave crest of the second light blocking structure 213, the wearable device 100 can include the temperature sensor 50 or the electrocardio sensor 60, so that the signal transmission electrode area of the temperature sensor 50 or the electrocardio sensor 60 can be increased, and the detection accuracy of the temperature sensor 50 or the electrocardio sensor 60 can be improved. When the conductive layer 214 is arranged on both the wave crest 210a of the first light blocking structure 210 and the wave crest of the second light blocking structure 213, the conductive layer 214 arranged on the wave crest 210a of the first light blocking structure 210 can be electrically connected with the temperature sensor 50, and the conductive layer 214 arranged on the wave crest of the second light blocking structure 213 can be electrically connected with the electrocardio sensor 60 (as shown in Figure 10 , Figure 10 It is shown that the conductive layer 214 on the first light blocking structure 210 is electrically connected with the temperature sensor 50, and the conductive layer 214 on the second light blocking structure 213 is electrically connected with the electrocardio sensor 60), so that the signal transmission electrode area of the temperature sensor 50 and the electrocardio sensor 60 can be increased at the same time, and the detection accuracy of the temperature sensor 50 and the electrocardio sensor 60 can be effectively improved.

[0069] Please refer to Figure 11 , Figure 11 is a fifth structure schematic diagram of the wearable device disclosed in the embodiments of the present application. In some embodiments, in order to further prevent the light from being transmitted between the light emitting device 30 and the photoelectric sensor 40, the back cover 20 further has an inner surface 22 facing the accommodating space 10a, which can be arranged opposite to the outer surface 21 of the back cover 20. The inner surface 22 can be provided with a light absorbing layer 22a for absorbing light, and the light absorbing layer 22a has a first light transmission region 220 and a second light transmission region 220a. The first light transmission region 220 is arranged corresponding to the light emitting device 30, and the second light transmission region 220a is arranged corresponding to the photoelectric sensor 40. As shown in Figure 11 , Figure 11 In the inner surface 22, the light absorbing layer 22a is arranged on the inner surface 22, and the light absorbing layer 22a has the first light transmission region 220 and the second light transmission region 220a, so that on the one hand, the light emitting device 30 will not be affected in emitting light, and the photoelectric sensor 40 will not be affected in receiving the reflected light from the outside, and on the other hand, by using the light absorbing layer 22a, the light emitted from the light emitting device 30 to the inner surface 22 of the back cover 20 can be absorbed as much as possible, so that the light reflected to the photoelectric sensor 40 when passing through the inner surface 22 can be avoided.

[0070] It can be understood that the light-absorbing layer 22a can be dark paint, such as black ink, dark gray ink, etc., which is coated on the inner surface 22, as long as it can absorb light, and the embodiment is not limited specifically. The first light-transmitting region 220 and the second light-transmitting region 220a can be formed by opening holes in the light-absorbing layer 22a. Alternatively, the light-absorbing layer 22a is provided as a light-transmitting layer at the positions of the first light-transmitting region 220 and the second light-transmitting region 220a, and the embodiment is not limited specifically.

[0071] Please refer to Figure 12 , Figure 12 is a sixth structure schematic diagram of the wearable device disclosed in the embodiment of the present application. In some other embodiments, a third light-blocking structure 22b can be further formed on the inner surface 22 corresponding to the first region 21a and the second region 21b, so that the inner surface 22 can also be formed as a non-flat surface. In this way, since the light-emitting device 30 and the photosensor 40 are arranged in the accommodation space 10a, the third light-blocking structure 22b is formed on the inner surface 22 of the rear cover 20, so that the inner surface 22 of the rear cover 20 is also formed as a non-flat surface, thereby changing the angle of light emitted by the light-emitting device 30, preventing total reflection of light when passing through the inner surface 22 of the rear cover 20, and avoiding reflection of light to the photosensor 40.

[0072] Further, the third light-blocking structure 22b can also be a corrugated structure with the center of the inner surface 22 as the center, extending from the center of the inner surface 22 to the edge of the inner surface 22, so that the third light-blocking structure 22b can be arranged corresponding to the light-emitting device 30 and the photosensor 40, directly emitting light emitted by the light-emitting device 30 outwards, avoiding direct reflection of light to the photosensor 40, and preventing cross-light between the light-emitting device 30 and the photosensor 40.

[0073] Further, considering that the projection of the light-emitting device 30 on the inner surface 22 is located in the region of the third light-blocking structure 22b, specifically, on the peak of the third light-blocking structure 22b, when the light-emitting device 30 emits light, the light will be reflected to the photosensor 40 through the peak of the third light-blocking structure 22b. Based on this, an light-absorbing coating 221 can be provided on the peak of the third light-blocking structure 22b, which can absorb the light emitted by the light-emitting device 30 to the rear cover 20, avoiding reflection of light to the photosensor 40. Specifically, the light-absorbing coating 221 can be dark paint, such as black ink, dark gray ink, etc., which is coated on the peak of the third light-blocking structure 22b.

[0074] Please refer to Figure 2In some embodiments, the wearable device 100 further comprises a light shielding member 70 located in the accommodation space 10a and surrounding the outer periphery of the light emitting device 30, for shielding the light emitted by the light emitting device 30 from directly transmitting to the photoelectric sensor 40. Since the light emitting device 30 and the photoelectric sensor 40 are both arranged in the accommodation space 10a, if there is no light shielding member 70, the light emitted by the light emitting device 30 will directly transmit to the photoelectric sensor 40, which also causes crosstalk between the light emitting device 30 and the photoelectric sensor 40. Therefore, by arranging the light shielding member 70 around the outer periphery of the light emitting device 30, the light emitted by the light emitting device 30 can be blocked from transmitting to the photoelectric sensor 40.

[0075] Further, the light shielding member 70 can be foam, sponge or the like surrounding the outer periphery of the light emitting device 30, as long as it can block light, which is not specifically limited in the present embodiment. In addition, in actual arrangement, the light shielding member 70 can be adhered to the inner surface 22 of the back cover 20, so as to avoid the light shielding member 70 from falling off from the inner surface 22 and losing the blocking effect on the light emitted by the light emitting device 30.

[0076] Please refer to Figure 13 For the seventh structural schematic diagram of the wearable device 100 disclosed in the present embodiment, in some embodiments, considering that the first light blocking structure 210 is formed on the outer surface 21 of the back cover 20, when worn, the first light blocking structure 210 can affect the comfort of the user when wearing, therefore, the wearable device 100 can further comprise a cover layer 80, which can be arranged on the outer surface 21, and the side of the cover layer 80 facing the outer surface 21 is formed with a fourth light blocking structure 81 matched with the first light blocking structure 210, so as to prevent the light emitted by the light emitting device 30 from being totally reflected on the cover layer 80, and effectively prevent crosstalk.

[0077] Optionally, the fourth light blocking structure 81 can be a corrugated structure matched with the first light blocking structure 210, so as to be matched with the outer surface 21 of the back cover 20. Specifically, the peaks and valleys of the fourth light blocking structure 81 are respectively matched with the peaks and valleys of the first light blocking structure 210, that is, when the cover layer 80 is arranged on the outer surface 21, the peaks of the fourth light blocking structure 81 are matched with the peaks of the first light blocking structure 210, and the valleys of the fourth light blocking structure 81 are matched with the valleys of the first light blocking structure 210. In this way, on the one hand, the cover layer 80 and the outer surface 21 can be connected, and on the other hand, by arranging the fourth light blocking structure 81, the angle of the light passing through the fourth light blocking structure 81 can be changed, so as to reduce the probability of total reflection of the light on the cover layer 80, and further prevent crosstalk between the light emitting device 30 and the photoelectric sensor 40.

[0078] Further, the outer surface of the cover layer 80 is flat, that is, the side surface 82 of the cover layer 80 away from the outer surface 21 is a smooth surface, so that when the wearable device 100 is worn, the side surface 82 of the cover layer 80 away from the outer surface 21 can prevent the human skin from being injured when the wearable device 100 is worn, and effectively improve the wearing comfort of the wearable device 100.

[0079] The wearable device provided in the present application forms the first light blocking structure on the second region of the outer surface of the back cover, uses the first light blocking structure to form the second region into a non-flat surface, so that the first light blocking structure can block the light reflected to the photoelectric sensor through the back cover. In this way, the light emitted by the light emitting device can be effectively blocked from being reflected to the photoelectric sensor without being absorbed by the human skin, that is, the problem of light cross between the light emitting device and the photoelectric sensor is effectively solved, and the heart rate detection accuracy of the wearable device is effectively improved.

[0080] The wearable device disclosed in the embodiments of the present application is described in detail above, and the principles and implementation modes of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the wearable device and its core idea; at the same time, for those skilled in the art, according to the idea of the present application, the specific implementation mode and application range will be changed, and the above description of the present application should not be understood as a limitation.

Claims

1. A wearable device, comprising: The wearable device comprises a main shell, a back cover, a light-emitting device, and a photoelectric sensor; The back cover is connected with the main shell and forms a containing space with the main shell, the light-emitting device and the photoelectric sensor are arranged in the containing space, the light-emitting device is used for emitting light outward, and the photoelectric sensor is used for receiving reflected light from the outside world. The back cover has an outer surface facing away from the containing space, the outer surface comprises a first area and a second area located at the periphery of the first area, the projection of the light-emitting device on the outer surface is located in the first area, and the projection of the photoelectric sensor on the outer surface is located in the second area, the second area is formed with a first light blocking structure, the first light blocking structure is used to form a non-flat surface in the second area to block light reflected to the photoelectric sensor through the back cover. The first light blocking structure is a corrugated structure formed in the second area, the corrugated structure comprises continuously connected peaks and valleys, and the projection of the photoelectric sensor on the outer surface is located in the valleys of the first light blocking structure.

2. The wearable device of claim 1, wherein: The first light blocking structure comprises protrusions protruding from the outer surface and / or recesses recessed from the outer surface.

3. The wearable device of claim 2, wherein: When the first light blocking structure comprises a plurality of protrusions and recesses, each recess is located between two adjacent protrusions.

4. The wearable device of claim 2, wherein: The shape of the first light blocking structure, which is cut along a plane perpendicular to the outer surface, is at least one of arc-shaped, zigzag-shaped or square-shaped.

5. The wearable device of claim 1, wherein: The photoelectric sensor is a plurality of photoelectric sensors arranged in a ring shape. The second area is an annular area arranged at the periphery of the first area with the light-emitting device as the center. 6.The wearable device of claim 5, wherein: The second area comprises a first sub-area and a second sub-area, the projection of the photoelectric sensor on the outer surface is located in the first sub-area, and the second sub-area is located between the first area and the first sub-area. At least one valley is located in the first sub-area, and at least one peak is located in the second sub-area.

7. The wearable device of claim 6, wherein: The first sub-area is provided with a plurality of light-transmitting windows, the light-transmitting windows are located at the positions of the valleys in the first sub-area, and each light-transmitting window corresponds to each photoelectric sensor.

8. The wearable device of claim 1, wherein: The distance between the centers of two adjacent peaks is 1mm-6mm, the distance from the center of the peak to the adjacent valley is b, and the depth of the valley is a, b / a≤8.

1.

9. The wearable device of claim 8, wherein: The angle between the side of the peak and the center of the peak is greater than 7°.

10. The wearable device of any one of claims 1-4, wherein: The first area is formed with a second light blocking structure, the second light blocking structure is a corrugated structure, and the projection of the light-emitting device on the first area is located in the peaks of the second light blocking structure. 11.The wearable device of claim 10, wherein: The first light blocking structure is a corrugated structure, the peaks of the first light blocking structure and / or the peaks of the second light blocking structure are provided with a conductive layer, the wearable device further comprises a temperature sensor and / or an electrocardio sensor, and the conductive layer is electrically connected with the temperature sensor and / or the electrocardio sensor.

12. The wearable device of any one of claims 1-9, wherein: The back cover further has an inner surface facing the accommodating space, which is arranged opposite to the outer surface, and third light-blocking structures are formed on the inner surface corresponding to the first and second regions, so that the inner surface is formed as a non-flat surface.

13. The wearable device of claim 12, wherein: The third light-blocking structures are corrugated structures with the center of the inner surface as the center and extending from the center to the edge.

14. The wearable device of claim 12, wherein: A light-absorbing coating is arranged on the wave crest of the third light-blocking structure.

15. The wearable device of any one of claims 1-9, wherein: The back cover further has an inner surface facing the accommodating space, which is arranged opposite to the outer surface, and a light-absorbing layer for absorbing light is arranged on the inner surface, the light-absorbing layer has a first light-transmitting region and a second light-transmitting region, the first light-transmitting region is arranged corresponding to the light-emitting device, and the second light-transmitting region is arranged corresponding to the photoelectric sensor.

16. The wearable device of any one of claims 1-4, wherein: The wearable device further includes a cover plate layer, which is arranged on the outer surface, and a fourth light-blocking structure is formed on the side of the cover plate layer facing the outer surface and matched with the first light-blocking structure.

17. The wearable device of claim 16, wherein: The side surface of the cover plate layer away from the outer surface is a smooth surface.

18. The wearable device of claim 16, wherein: The fourth light-blocking structure is a corrugated structure, and the wave crest and wave trough of the first light-blocking structure are respectively matched and connected with the wave crest and wave trough of the fourth light-blocking structure.

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