Smart ring

Abstract

The utility model relates to human body wearing equipment technical field, especially a kind of intelligent ring, and the intelligent ring includes shell, circuit board and PPG module, PPG module includes green light module, reflection module and photoelectric sensor, and the intelligent ring further includes first light shield, and first light shield is located in circuit board;First light shield has first optical cavity and second optical cavity, and first optical cavity and second optical cavity are isolated arrangement, and one of green light module and reflection module is located in first optical cavity, and the other of green light module and reflection module is located in second optical cavity;Wherein, first optical cavity and second optical cavity are equipped with light transmission window, and light transmission window is configured to be penetrated by the light beam of green light module and reflection module, and photoelectric sensor is configured to receive the light beam of green light module and reflection module.The main purpose of the utility model is to provide a kind of intelligent ring, to reduce the frequency of light interference caused by the coincidence of propagation path in the ring inside two different light sources, improve the detection accuracy of PPG module.

Description

Technical Field

[0001] This utility model relates to the field of wearable devices, and in particular to a smart ring. Background Technology

[0002] Amid the rapid development of smart wearable devices, smart rings have garnered widespread attention due to their portability and multifunctionality, with blood oxygen monitoring becoming a core requirement for many users. Currently, most mainstream smart rings achieve blood oxygen monitoring by integrating a PPG (photoplethysmography) module. This technology utilizes optical principles to non-invasively detect blood oxygen saturation, providing users with real-time health data for reference. The core components of the PPG module include LED beads and a photoelectric sensor. The LED beads emit light of a specific wavelength. After penetrating skin tissue, some of this light is absorbed by hemoglobin in the blood, while the unabsorbed light is reflected back to the photoelectric sensor. Because the heartbeat causes periodic changes in the volume of blood in the vessels, the amount of light absorbed also fluctuates. The photoelectric sensor captures these periodic changes in light intensity, and after processing by algorithms, it can calculate physiological parameters such as blood oxygen saturation. However, in practical applications, due to limitations in wavelength, penetration ability, and smart ring size, the green light module and reflective module of the PPG module are usually placed close to the photoelectric sensor. The green light module and reflective module share a light shield. In this case, the propagation paths of the light beams emitted by the two modules highly overlap before penetrating the skin, forming an intersection area that causes optical signal interference. The original light signal is contaminated, the signal-to-noise ratio (SNR) decreases, and the heart rate / blood oxygen data fluctuates greatly, thereby reducing the detection accuracy of the PPG module. Utility Model Content

[0003] The main purpose of this invention is to provide a smart ring that reduces the frequency of light interference caused by overlapping propagation paths between two different light sources inside the smart ring, thereby improving the detection accuracy of the PPG module.

[0004] To address the aforementioned issues, the smart ring includes a housing, a circuit board, and a PPG module. The housing has a receiving cavity, the circuit board is disposed within the receiving cavity, and the PPG module is disposed on the circuit board. The PPG module includes a green light module, a reflective module, and a photoelectric sensor. The smart ring also includes a first light shield disposed on the circuit board. The first light shield has a first optical cavity and a second optical cavity, which are isolated from each other. One of the green light module and the reflective module is located in the first optical cavity, and the other of the green light module and the reflective module is located in the second optical cavity. The first optical cavity and the second optical cavity are provided with light-transmitting windows, which are configured to allow the light beams of the green light module and the reflective module to pass through. The photoelectric sensor is configured to receive the light beams of the green light module and the reflective module.

[0005] In one embodiment of the present invention, the smart ring has a charging post, which is disposed on the circuit board and electrically connected to the circuit board; at least one of the charging posts is located on the first light shield, and the two ends of the charging post are close to or abut against the inner peripheral wall of the first light shield, so that the first light shield forms the first light cavity and the second light cavity on both sides of the charging post.

[0006] In one embodiment of this utility model, the first light shield is provided with a contoured groove, and one of the charging posts is engaged in the contoured groove.

[0007] In one embodiment of this utility model, the reflective module, the charging column, the green light module, and the photoelectric sensor are arranged on the circuit board along the circumferential direction of the receiving cavity.

[0008] In one embodiment of the present invention, the second optical cavity is disposed close to the photoelectric sensor relative to the first optical cavity along the circumferential direction of the receiving cavity, the green light module is located in the second optical cavity, and the reflection module is located in the first optical cavity.

[0009] In one embodiment of this utility model, the first light shield has a light-shielding protrusion on the end face near the second light cavity, the light-shielding protrusion has a light-emitting channel, the light-emitting channel is connected to the second light cavity; the distance from the light outlet of the light-emitting channel to the center of the smart ring is less than the distance from the light-emitting surface of the green light module to the center of the smart ring.

[0010] In one embodiment of this utility model, the height of the light-shielding protrusion gradually increases from the end furthest from the photoelectric sensor to the end closest to the photoelectric sensor.

[0011] In one embodiment of the present invention, the shell wall of the housing is provided with two fixing grooves corresponding to the thickness direction of the smart ring, and the first light shield is provided with two fixing arms corresponding to the thickness direction of the smart ring, each fixing arm being limited to one of the fixing grooves.

[0012] In one embodiment of this utility model, the smart ring further includes a second light shield, which is disposed on the circuit board; the photoelectric sensor is located on the second light shield.

[0013] In one embodiment of the present invention, the PPG module is further provided with a transmission module, and the circuit board is provided with a first mounting area, a second mounting area and a third mounting area along the circumferential direction of the receiving cavity. The first mounting area and the third mounting area are located at both ends of the circuit board, and the second mounting area is located between the first mounting area and the third mounting area and is disposed close to the third mounting area. The transmission module is located in the first mounting area, the green light module and the reflection module are located in the second mounting area, and the photoelectric sensor is located in the third mounting area; The photoelectric sensor is also configured to receive the light beam from the transmission module.

[0014] In this invention, the interior of the first light shield forms a first and a second optical cavity that are isolated from each other. The green light module and the reflection module are placed in the two optical cavities respectively, so that the propagation paths of the two light sources are physically isolated inside the smart ring, avoiding the intersection area formed by the overlapping propagation paths from the source. At the same time, both the first and second optical cavities are provided with light-transmitting windows to ensure that the light beams can pass through normally and be received by the photoelectric sensor without affecting the basic detection process. Therefore, in this invention, through the isolation design of the first light shield, the light beams of the green light module and the reflection module no longer overlap in propagation paths inside the device, blocking the light signal interference in the intersection area and avoiding the contamination of the original light signal. Since the interference signal is eliminated, the proportion of effective light signal received by the photoelectric sensor is significantly increased, and the signal-to-noise ratio is greatly improved, providing purer and more stable raw data for subsequent algorithm processing. The stable high signal-to-noise ratio signal input makes the calculation results of physiological parameters such as heart rate and blood oxygen saturation more accurate, reduces the data fluctuation range, and ultimately improves the detection accuracy of the PPG module, meeting the user's core requirement for the reliability of health monitoring data. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the layout of the PPG module of the smart ring provided by this utility model; Figure 2 A schematic diagram of the structure of the smart ring provided by this utility model; Figure 3 This is a schematic diagram of the structure of the first light shield provided by this utility model.

[0017] Explanation of icon numbers: 100. Smart ring; 10. Housing; 20. Circuit board; 30. PPG module; 31. Green light module; 32. Reflection module; 33. Photoelectric sensor; 34. Transmission module; 40. First light shield; 40a. First optical cavity; 40b. Second optical cavity; 40c. Contouring groove; 41. Light-shielding protrusion; 42. Fixing arm; 50. Charging column; 60. Second light shield.

[0018] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0021] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0022] The main purpose of this invention is to provide a smart ring that reduces the frequency of light interference caused by overlapping propagation paths between two different light sources inside the smart ring, thereby improving the detection accuracy of the PPG module 30.

[0023] To resolve the above issues, please refer to [link / reference]. Figure 1 and Figure 2 The smart ring includes a housing 10, a circuit board 20, and a PPG module 30. The housing 10 has a receiving cavity, the circuit board 20 is disposed in the receiving cavity, and the PPG module 30 is disposed on the circuit board 20. The PPG module 30 includes a green light module 31, a reflection module 32, and a photoelectric sensor 33. The smart ring also includes a first light shield 40, which is disposed on the circuit board 20. The first light shield 40 has a first light cavity 40a and a second light cavity 40b, which are isolated from each other. One of the green light module 31 and the reflection module 32 is located in the first light cavity 40a, and the other of the green light module 31 and the reflection module 32 is located in the second light cavity 40b. The first optical cavity 40a and the second optical cavity 40b are provided with light-transmitting windows, which are configured to allow the light beams of the green light module 31 and the reflective module 32 to pass through. The photoelectric sensor 33 is configured to receive the light beams of the green light module 31 and the reflective module 32.

[0024] Before providing a technical explanation of this utility model, the applicant will first explain the principle of the PPG module 30: PPG (Photoplethysmography) is a technology that uses optical means to detect changes in blood volume to obtain physiological parameters (such as heart rate, blood oxygen saturation, etc.). Its core principle is to utilize the absorption characteristics of hemoglobin in the blood for specific wavelengths of light and the periodic changes in blood volume within blood vessels with the heartbeat to achieve detection. Specifically, the green light module 31 and the reflective module 32, which includes red light beads and infrared light beads, in the PPG module 30 emit light of specific wavelengths, which penetrate the skin and irradiate the subcutaneous blood vessel tissue. Some of the light is absorbed by the hemoglobin in the blood. The light absorbed is partially reflected or transmitted by the tissues surrounding the blood vessels. The heartbeat causes the blood vessels to periodically expand and contract, resulting in periodic changes in blood volume and the amount of light absorbed. The photoelectric sensor 33 receives the remaining light signal and converts it into an electrical signal. This electrical signal exhibits periodic fluctuations (PPG waveform) synchronized with the heartbeat due to changes in blood volume. By analyzing the PPG waveform, physiological parameters such as heart rate can be calculated. For example, green light is sensitive to the absorption of oxyhemoglobin and has a moderate penetration depth, making it suitable for high-precision detection of heart rate and blood oxygen. Red light and infrared light have a large penetration depth, making them suitable for detection in thicker skin or during exercise. In a smart ring, if the optical paths of different light sources overlap or crosstalk, the signal received by the photoelectric sensor 33 will be mixed with interfering light, reducing the detection accuracy.

[0025] Therefore, in this invention, the green light module 31 and the reflection module 32 are physically isolated to prevent interference between the light beams emitted by the two modules.

[0026] Specifically, the housing 10 is the main body of the smart ring, and its ends are connected to form a closed ring structure so that it can be worn on the human finger. The housing 10 can be composed of an outer shell and an inner shell, with the inner and outer shells forming a ring-shaped receiving cavity, or it can be composed of two half shells, with the two half shells forming a ring-shaped receiving cavity. The receiving cavity provides a fixed foundation for the electronic components, support brackets and other structures of the smart ring, so as to prevent the electronic components, support brackets and other structures from becoming relatively loose with the housing 10.

[0027] To adapt to the shape of the receiving cavity, the circuit board 20 is usually composed of flexible circuit boards 20, flexible flat cables and other circuit structures that can be bent and deformed. The flexible circuit boards 20 and flexible flat cables have good flexibility and bendability, and can adapt to the complex shape of the receiving cavity such as curvature and corners, and fit tightly against the inner wall of the receiving cavity. This saves space and ensures the stability of the circuit connection, thereby ensuring the normal operation of the components inside the smart ring.

[0028] A circuit clearance area is provided on the circuit board 20. The first light shield 40 is fixed to the circuit clearance area with black double-sided tape. The circuit clearance area on the circuit board 20 avoids circuit traces and components, and provides dedicated space for the installation of the first light shield 40. The use of black double-sided tape to fix the first light shield to this area not only achieves a stable connection, but the black material can also further enhance the light shielding effect, reduce the possibility of light leakage or crosstalk from the connection gap, and the flexibility of the double-sided tape can also adapt to the slight deformation during the installation process, ensuring a tight fit between the first light shield 40 and the circuit board 20, thereby better maintaining the isolation state of the first optical cavity 40a and the second optical cavity 40b, and ensuring the detection accuracy of the PPG module 30.

[0029] The isolation setting of the first optical cavity 40a and the second optical cavity 40b of the first light shield 40 means that the two optical cavities of the first light shield 40 are made with two isolated optical cavities, or that two isolated optical cavities are formed by installing another structure into the first light shield 40. The specific setting is not limited, as long as the light beams emitted by the light source located in the first optical cavity 40a and the light source located in the second optical cavity 40b are physically isolated when the PPG module 30 of the smart ring is running.

[0030] In one embodiment, the first light shield 40 is manufactured by an integral injection molding process. Using black light-shielding plastic as raw material, the first light shield 40 with a complete structure is formed in one injection molding process. During molding, the light shield forms independent first light cavities 40a and second light cavities 40b. The two light cavities are completely separated by an integrally molded light-shielding partition. The partition is seamlessly connected to the top wall, bottom wall, and side walls of the light shield, forming two physically isolated spaces. The first light shield 40 corresponds to the first light cavity 40a and the second light cavity 40b. At the location of the two optical cavities 40b, a light-transmitting window is opened on each of them. The two light-transmitting windows are respectively connected to the first optical cavity 40a and the second optical cavity 40b of the first light shield 40. The light-transmitting windows allow the light beam to pass through, while the other walls of the light shield and the light shield are made of opaque material. This ensures that when the PPG module 30 is running, the light beam emitted by the green light module 31 located in the first optical cavity 40a and the light beam emitted by the reflection module 32 located in the second optical cavity 40b cannot crosstalk to each other through the gap between the two optical cavities, thus achieving physical isolation of the light beam.

[0031] In another embodiment, please refer to Figure 2 The smart ring has a charging post 50, which is disposed on and electrically connected to the circuit board 20. At least one charging post 50 is located on the first light shield 40, and the two ends of the charging post 50 abut against the inner peripheral wall of the first light shield 40, so that the first light shield 40 forms a first optical cavity 40a and a second optical cavity 40b on both sides of the charging post 50. In this way, the charging post 50 and the inner peripheral wall of the first light shield 40 are physically separated, so that the green light module 31 and the reflection module 32 can be placed in the two optical cavities respectively. The structure of the charging post 50 itself and its cooperation with the light shield block the crosstalk between the beams in the two optical cavities. At the same time, the charging post 50 can still perform the charging function normally. Without adding additional isolation components, the isolation effect of the optical cavity is guaranteed to improve the detection accuracy of the PPG module 30, while making full use of space and simplifying the structural design.

[0032] Further, please refer to Figure 3 The first light shield 40 is provided with a contoured groove 40c, and a charging post 50 is fitted into the contoured groove 40c. Specifically, the first light shield 40 is provided with a contoured groove 40c that matches the shape of the charging post 50. A single charging post 50 is precisely fitted into the contoured groove 40c. Through the precise fit between the contoured groove 40c and the charging post 50, the two ends of the charging post 50 can stably approach or abut against the inner peripheral wall of the first light shield 40. This ensures the stability of the installation of the charging post 50 in the light shield and strengthens the isolation effect of the charging post 50 on the first optical cavity 40a and the second optical cavity 40b through this fitting structure. At the same time, the contoured design can also guide the charging post 50 to be quickly positioned and installed, improve assembly efficiency, ensure the independent sealing of the two optical cavities inside the light shield, and further reduce the possibility of beam crosstalk.

[0033] In one embodiment of this utility model, please refer to Figure 2 The reflective module 32, charging post 50, green light module 31, and photoelectric sensor 33 are arranged on the circuit board 20 along the circumferential direction of the receiving cavity. This arrangement can fully adapt to the annular or arc-shaped spatial structure of the receiving cavity, allowing each component to be distributed in an orderly manner within the limited internal space. This ensures that the reflective module 32 and the green light module 31 are located in the first optical cavity 40a and the second optical cavity 40b separated by the charging post 50 to achieve optical isolation. It also allows the photoelectric sensor 33 to be in a reasonable position to efficiently receive the light beams from both. At the same time, conforming to the circumferential layout of the receiving cavity can reduce spatial interference between components, improve the compactness and space utilization of the overall structure, and ensure that each component does not affect each other when performing its own function (such as charging post 50 charging and PPG module 30 detection), further optimizing the internal structural design of the smart ring.

[0034] Further, please refer to Figure 2 and Figure 3 The second optical cavity 40b is positioned closer to the photoelectric sensor 33 relative to the first optical cavity 40a along the circumferential direction of the receiving cavity. The green light module 31 is located in the second optical cavity 40b, and the reflection module 32 is located in the first optical cavity 40a. Specifically, the green light emitted by the green light module 31 is sensitive to the absorption of oxyhemoglobin in the blood. The wavelength of green light is usually between 500-560nm, and its penetration depth into the skin is relatively shallow, mainly acting on the capillaries under the epidermis. Its effective detection depends on a stable optical path with low attenuation. Placing the green light module 31 closer to the photoelectric sensor 33 in the second optical cavity 40b can shorten the propagation path of green light from emission to reception, reduce scattering loss and ambient light interference during long-distance propagation, and ensure that the photoelectric sensor 33 can capture a purer green light signal. The reflective module 32 typically involves red or infrared light. These long-wavelength lights have a greater penetration depth, reaching the dermal blood vessels, and have relatively strong anti-interference capabilities. Placing it in the first optical cavity 40a, which is relatively far away from the photoelectric sensor 33, can both prevent wavelength crosstalk with green light inside the module through optical cavity isolation and adapt to its longer physiological tissue penetration path, ensuring that the reflected light can still be effectively received by the photoelectric sensor 33 after passing through deep tissue. Thus, based on the detection advantages of different wavelengths of light, the signal discrimination and detection accuracy of the PPG module 30 are further improved.

[0035] To improve the light-blocking capability of the first light shield 40, please refer to... Figure 3The first light shield 40 has a light-shielding protrusion 41 on its end face near the second light cavity 40b. The light-shielding protrusion 41 is an opaque structure that can block external stray light from entering the second light cavity 40b and prevent the light emitted by the green light module 31 in the second light cavity 40b from scattering to the surroundings, thus reducing light leakage. The light-shielding protrusion 41 has a light-emitting channel that connects to the second light cavity 40b. The distance from the light-emitting port of the light-emitting channel to the center of the smart ring is less than the distance from the light-emitting surface of the green light module 31 to the center of the smart ring. This means that the light-emitting port of the light-shielding protrusion 41 is smaller than the distance from the light-emitting surface of the green light module 31 to the center of the smart ring. Compared to the green light module 31, the light-emitting surface is closer to the center of the ring, meaning it is closer to the skin of the finger when worn. Thus, by using the light-blocking protrusion 41 to restrict the light-emitting direction, the propagation path of the green light from the light-emitting port to the skin tissue can be shortened, reducing the divergence and loss of light in the air, allowing more green light to effectively act on the skin. At the same time, because the light-emitting port is closer to the detection area, the probability of external stray light entering the light-emitting channel is reduced, further ensuring the purity of the green light signal, thereby enhancing the light-blocking effect of the first light-blocking cover 40 and improving the detection accuracy of the green light signal by the PPG module 30.

[0036] Further, please refer to Figure 3 The light-shielding protrusion 41 is sloping or stepped, and gradually increases in size along the circumferential direction of the receiving cavity from the end away from the photoelectric sensor 33 to the end closer to the photoelectric sensor 33. This design can accurately guide the light path emitted by the green light module 31. The lower end, away from the photoelectric sensor 33, allows the light to be emitted at a natural angle to reduce light energy loss, while the higher end, closer to the photoelectric sensor 33, gradually constrains the beam to make it more concentrated and projected onto the target detection area, thereby improving the light energy utilization rate. At the same time, the gradually increasing height forms a "light-blocking wall" to effectively prevent the beam emitted by the green light module 31 from entering the receiving area of ​​the photoelectric sensor 33 directly from the side without passing through the finger, thereby improving the signal-to-noise ratio.

[0037] In one embodiment, please refer to Figure 3 The shell wall of the housing 10 is provided with two fixing grooves corresponding to the thickness direction of the smart ring. The first light shield 40 is provided with two fixing arms 42 corresponding to the thickness direction of the smart ring. Each fixing arm 42 is confined to a fixing groove. Please refer to [link / reference]. Figure 3 Each fixing arm 42 of the first light shield 40 is stepped, which increases the contact area between the fixing arm 42 and the fixing groove, thereby improving the structural interlocking strength between the first light shield 40 and the housing 10. This effectively prevents the first light shield 40 from loosening or falling off due to external impact or long-term wear, ensuring the stable positioning of the first light shield 40 within the housing 10. At the same time, the stepped design facilitates guidance and alignment during assembly, reduces assembly difficulty, and improves production efficiency. In addition, this structure can also disperse stress to a certain extent, reduce the risk of local deformation, and extend the service life of the overall structure of the smart ring. Ultimately, it enhances the durability and reliability of the product while ensuring assembly accuracy.

[0038] To reduce the amount of light emitted by the photoelectric sensor 33 due to ambient light, please refer to [link / reference needed]. Figure 2 The smart ring also includes a second light shield 60, which is located on the circuit board 20. A photoelectric sensor 33 is located within the second light shield 60. Specifically, the photoelectric sensor 33 is tilted within the receiving cavity. The second light shield 60 also has a light-transmitting window, which faces the photosensitive surface of the photoelectric sensor 33, thus forming a directional light path receiving structure. This design not only effectively blocks ambient light from entering the photosensitive area through physical isolation, significantly reducing background noise and improving the signal-to-noise ratio, but also allows the photoelectric sensor 33 to accurately align with the signal light returned by the green light module 31 and the reflection module 32 through its tilted layout, enhancing the reception efficiency of useful light signals. Simultaneously, the light-transmitting window of the second light shield 60 only allows light from specific directions to pass through, further filtering stray light from non-target directions. This ensures high-precision and high-stability blood oxygen and heart rate detection performance even under complex lighting conditions, providing reliable optical signal acquisition for the smart ring.

[0039] In one embodiment of this utility model, please refer to Figure 1The PPG module 30 also includes a transmission module 34. The circuit board 20 has a first mounting area, a second mounting area, and a third mounting area along the circumferential direction of the receiving cavity. The first and third mounting areas are located at opposite ends of the circuit board 20, and the second mounting area is located between the first and third mounting areas and close to the third mounting area. The transmission module 34 is located in the first mounting area, the green light module 31 and the reflection module 32 are located in the second mounting area, and the photoelectric sensor 33 is located in the third mounting area. The photoelectric sensor 33 is also configured to receive the light beam from the transmission module 34. The first and third mounting areas are located at opposite ends of the circuit board 20, creating a long-distance distribution between the transmission module 34 and the photoelectric sensor 33 along the circumferential direction of the receiving cavity. The space between them is precisely the area where a finger rests; that is, the light emitted by the transmission lamp must penetrate the finger to be received by the photoelectric sensor 33. The finger itself acts as a natural barrier, preventing light that has not passed through the skin from directly reaching the photoelectric sensor 33. Therefore, there is no need to provide an additional light shield for the transmission module 34, simplifying the process. This design not only improves the structure but also saves space. Simultaneously, the second installation area is close to the third installation area, shortening the distance between the green light module 31 and the reflection module 32 and the photoelectric sensor 33, reducing light loss in the reflected light path, and improving the efficiency of reflected signal reception. Furthermore, the spatial spacing between each installation area reduces crosstalk between different light sources. The overall layout adapts to the characteristics of the arc-shaped cavity while also meeting the functional requirements of both transmission and reflection detection modes, further enhancing the detection accuracy and structural rationality of the PPG module 30. Furthermore, the transmission module 34 includes a transmission LED and a boss structure on the surface of the transmission LED. The boss structure, with the light-emitting surface of the transmission LED as a circle, forms a semi-circular truncated cone structure. This semi-circular truncated cone can focus and guide the light emitted by the transmission LED. Through the refraction effect of its arc-shaped surface, it converges the divergent light towards the center of the smart ring 100, i.e., the finger direction, reducing the scattering of light to surrounding unrelated areas, allowing more light to be concentrated and projected onto the finger's skin surface and penetrate the tissue, thereby enhancing the intensity and directionality of the transmitted light.

[0040] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of the specification and drawings of this utility model, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A smart ring, comprising a housing (10), a circuit board (20), and a PPG module (30), wherein the housing (10) has a receiving cavity, the circuit board (20) is disposed in the receiving cavity, and the PPG module (30) is disposed on the circuit board (20), the PPG module (30) comprising a green light module (31), a reflection module (32), and a photoelectric sensor (33), characterized in that, The smart ring also includes a first light shield (40), which is disposed on the circuit board (20); the first light shield (40) has a first light cavity (40a) and a second light cavity (40b), which are isolated from each other; one of the green light module (31) and the reflection module (32) is located in the first light cavity (40a), and the other of the green light module (31) and the reflection module (32) is located in the second light cavity (40b); The first optical cavity (40a) and the second optical cavity (40b) are provided with light-transmitting windows, which are configured to allow light beams from the green light module (31) and the reflective module (32) to pass through. The photoelectric sensor (33) is configured to receive light beams from the green light module (31) and the reflective module (32).

2. The smart ring as described in claim 1, characterized in that, The smart ring has a charging post (50), which is disposed on the circuit board (20) and electrically connected to the circuit board (20); at least one of the charging posts (50) is located on the first light shield (40), and the two ends of the charging post (50) abut against the inner peripheral wall of the first light shield (40) so that the first light shield (40) forms a first optical cavity (40a) and a second optical cavity (40b) on both sides of the charging post (50).

3. The smart ring as described in claim 2, characterized in that, The first light shield (40) is provided with a contoured groove (40c), and a charging post (50) is engaged in the contoured groove (40c).

4. The smart ring as described in claim 2, characterized in that, The reflective module (32), the charging column (50), the green light module (31), and the photoelectric sensor (33) are arranged on the circuit board (20) along the circumferential direction of the receiving cavity.

5. The smart ring as described in claim 4, characterized in that, The second optical cavity (40b) is disposed close to the photoelectric sensor (33) relative to the first optical cavity (40a) along the circumferential direction of the receiving cavity. The green light module (31) is located in the second optical cavity (40b), and the reflection module (32) is located in the first optical cavity (40a).

6. The smart ring as described in claim 5, characterized in that, The first light shield (40) has a light shielding protrusion (41) on the end face near the second light cavity (40b). The light shielding protrusion (41) has a light emission channel, which is connected to the second light cavity (40b). The distance from the light emission port of the light emission channel to the center of the smart ring is less than the distance from the light emission surface of the green light module (31) to the center of the smart ring.

7. The smart ring as described in claim 6, characterized in that, The height of the light-shielding protrusion (41) gradually increases from the end furthest from the photoelectric sensor (33) to the end closest to the photoelectric sensor (33).

8. The smart ring as described in claim 1, characterized in that, The shell wall of the housing (10) is provided with two fixing grooves that are correspondingly arranged along the thickness direction of the smart ring, and the first light shield (40) is provided with two fixing arms (42) that are correspondingly arranged along the thickness direction of the smart ring, and each fixing arm (42) is limited to one of the fixing grooves.

9. The smart ring as described in any one of claims 1 to 8, characterized in that, The smart ring also includes a second light shield (60), which is disposed on the circuit board (20); the photoelectric sensor (33) is located on the second light shield (60).

10. The smart ring as described in claim 9, characterized in that, The PPG module (30) is further provided with a transmission module (34). The circuit board (20) is provided with a first mounting area, a second mounting area and a third mounting area along the circumferential direction of the receiving cavity. The first mounting area and the third mounting area are located at both ends of the circuit board (20). The second mounting area is located between the first mounting area and the third mounting area and is located close to the third mounting area. The transmission module (34) is located in the first mounting area, the green light module (31) and the reflection module (32) are located in the second mounting area, and the photoelectric sensor (33) is located in the third mounting area; The photoelectric sensor (33) is also configured to receive the light beam from the transmission module (34).

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