A fresnel film sheet structure, optical assembly and intelligent device

Abstract

This application relates to the field of intelligent electronic device technology, providing a Fresnel diaphragm structure, optical components, and intelligent devices. The Fresnel diaphragm structure includes a first diaphragm, a second diaphragm, and a third diaphragm, all integrally cut from a single Fresnel diaphragm sheet. The first and third diaphragms are isolated from each other by a perforated area. A second diaphragm connects the first and third diaphragms and has at least two bending structures. The Fresnel diaphragm structure of this application is integrally cut from a single Fresnel diaphragm sheet, resulting in a simple overall structure, reduced processing and assembly difficulty, and suitability for mass production. The bending structures can refract the transmitted light between the first and third diaphragms multiple times, significantly attenuating the intensity of transmitted light, effectively suppressing light leakage and optical crosstalk, and improving the signal-to-noise ratio, thereby ensuring accuracy and reliability in optical measurement scenarios such as heart rate monitoring.

Description

Technical Field

[0001] This utility model relates to the field of intelligent electronic equipment technology, and further to a Fresnel diaphragm structure, optical components, and intelligent devices. Background Technology

[0002] In heart rate monitoring devices, optical sensors measure heart rate by detecting optical changes caused by subcutaneous blood flow. However, when the device is placed on a smooth surface such as glass, the optical sensor is prone to light leakage due to external light interference, leading to a decrease in the signal-to-noise ratio and impaired measurement accuracy. In traditional structures, the diaphragm of the optical sensor is usually divided into two independent diaphragms to achieve physical and optical isolation and solve the light leakage problem. However, this method has problems such as high assembly complexity and difficulty in ensuring alignment accuracy, affecting production efficiency and structural stability. Utility Model Content

[0003] To address the aforementioned technical problems, the purpose of this utility model is to provide a Fresnel diaphragm structure, optical components, and intelligent devices. The Fresnel diaphragm structure is integrally cut and formed from a single Fresnel diaphragm sheet. The first diaphragm connects to a light receiving sensor, and the third diaphragm connects to a light emitting sensor. The overall structure is simple, reducing processing and assembly difficulty and making it suitable for mass production. The second diaphragm has at least two bending structures, which can refract the transmitted light between the first and third diaphragms multiple times, significantly attenuating the intensity of transmitted light, effectively suppressing light leakage and optical crosstalk, and improving the signal-to-noise ratio, thereby ensuring accuracy and reliability in optical measurement scenarios such as heart rate monitoring.

[0004] To achieve the above objectives, this utility model provides a Fresnel pattern diaphragm structure, comprising a first diaphragm integrally cut from the same Fresnel pattern diaphragm, at least one second diaphragm, and a third diaphragm.

[0005] The first diaphragm and the third diaphragm are coaxially arranged and isolated from each other by a hollow area. The third diaphragm is located in the inner circle of the first diaphragm. The first diaphragm is adapted to connect to a light receiving sensor and the third diaphragm is adapted to connect to a light emitting sensor.

[0006] The second diaphragm is connected between the first diaphragm and the third diaphragm. The second diaphragm has at least two bending structures that are adapted to refract light transmitted between the first diaphragm and the third diaphragm multiple times, thereby significantly attenuating the intensity of transmitted light.

[0007] In some embodiments, the bending structure has a bending angle, which is a right angle.

[0008] In some embodiments, the second diaphragm has two bending structures, the second diaphragm including a first part, a second part and a third part, the outer end of the first part being connected to the first diaphragm, and the inner end of the third part being connected to the third diaphragm;

[0009] The first part and the third part are parallel to each other and both extend in the radial direction of the first membrane; the second part is perpendicular to the first part and the third part, so that the second membrane is Z-shaped.

[0010] In some embodiments, the second diaphragm has four bending structures, the second diaphragm including a first part, a second part, a third part, a fourth part and a fifth part connected in sequence, the first part, the third part and the fifth part all extending in the radial direction of the first diaphragm; the second part is perpendicular to the first part and the third part, and the fourth part is perpendicularly connected to the second part and the fifth part.

[0011] In some embodiments, there are two second diaphragms, which are symmetrically arranged on both sides of the central axis of the third diaphragm.

[0012] In some embodiments, the bending structure has a bending angle of 60°-120°.

[0013] According to another aspect of this application, an optical component is further provided, including any one of the Fresnel diaphragm structures of the above preferred embodiments, a first glass, a first black water-collecting foam adhesive, and a second black water-collecting foam adhesive;

[0014] The outer periphery of the first diaphragm of the Fresnel pattern diaphragm structure is fixed to the first glass by the first black water-absorbing foam adhesive, and the second diaphragm is fixed to the first glass by the second black water-absorbing foam adhesive.

[0015] In some embodiments, a second glass and a third black water-collecting foam adhesive are also included, wherein the side of the second diaphragm facing away from the first glass is adhered and fixed to the second glass by the third black water-collecting foam adhesive.

[0016] In some embodiments, the system further includes two light emitting sensors and four light receiving sensors. The two light emitting sensors are respectively disposed in the central region of the third diaphragm of the Fresnel pattern diaphragm structure, and the four light receiving sensors are circumferentially spaced and disposed on the outer periphery of the first diaphragm.

[0017] According to another aspect of this application, a smart device is further provided, including any one of the optical components described in the preferred embodiments above.

[0018] Compared with the prior art, the Fresnel diaphragm structure, optical component, and intelligent device provided by this utility model have at least one of the following beneficial effects:

[0019] 1. The Fresnel diaphragm structure is integrally cut from a single Fresnel diaphragm sheet. The first diaphragm connects to the light receiving sensor, and the third diaphragm connects to the light emitting sensor. The overall structure is simple, reducing the difficulty of processing and assembly, and is suitable for mass production. The second diaphragm has at least two bending structures. The bending structures can refract the transmitted light between the first and third diaphragms multiple times, significantly attenuating the intensity of transmitted light, effectively suppressing light leakage and optical crosstalk, and improving the signal-to-noise ratio, thereby ensuring the accuracy and reliability in optical measurement scenarios such as heart rate monitoring.

[0020] 2. The bending angle of the bending structure is preferably a right angle. A right angle has the best light blocking effect, which can effectively reduce the transmission and scattering of light and block the light of the first and third membranes.

[0021] 3. The first and second diaphragms of the Fresnel pattern diaphragm structure are respectively bonded and fixed to the first glass by the first black water-absorbing foam adhesive and the second black water-absorbing foam adhesive, which further absorbs residual light and prevents light from passing through the Fresnel pattern diaphragm structure or leaking out from the edge, thereby slowing down or blocking the light emitted by the light emission sensor, realizing the film on the glass without light leakage, and realizing mass production.

[0022] 4. The side of the second diaphragm away from the first glass is fixed to the second glass by a third black water-absorbing foam adhesive, thus forming a double-sided clamping and fixing of the Fresnel pattern diaphragm structure together with the first glass, which enhances the rigidity and stability of the overall component, avoids displacement caused by external vibration or temperature change, and further blocks potential light leakage paths. Attached Figure Description

[0023] The preferred embodiments will be described below in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages and implementation methods of this utility model.

[0024] Figure 1 This is a structural diagram of a Fresnel twill membrane;

[0025] Figure 2 This is a top view of the Fresnel diaphragm structure;

[0026] Figure 3 This is a structural diagram of the second membrane;

[0027] Figure 4 This is an exploded view of the optical components;

[0028] Figure 5 This is a cross-sectional view of the Fresnel diaphragm structure.

[0029] Explanation of icon numbers:

[0030] Fresnel-patterned diaphragm structure 1, first diaphragm 11, second diaphragm 12, bending structure 120, first part 121, second part 122, third part 123, third diaphragm 13, first glass 2, first black water-absorbing foam adhesive 3, second black water-absorbing foam adhesive 4, third black water-absorbing foam adhesive 5, light emitting sensor 6, light receiving sensor 7. Detailed Implementation

[0031] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0032] To keep the drawings concise, each figure only schematically shows the parts relevant to the utility model, and these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0033] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0034] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Furthermore, in the description of this application, the terms "first," "second," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

[0036] refer to Figure 1 and Figure 2 This utility model provides a Fresnel pattern diaphragm structure 1, including a first diaphragm 11 integrally cut from the same Fresnel pattern diaphragm, at least one second diaphragm 12, and a third diaphragm 13; the first diaphragm 11 and the third diaphragm 13 are coaxially arranged and isolated from each other by a hollow area, the third diaphragm 13 is located in the inner circle of the first diaphragm 11, the first diaphragm 11 is adapted to connect to a light receiving sensor 7, and the third diaphragm 13 is adapted to connect to a light emitting sensor 6; the second diaphragm 12 is connected between the first diaphragm 11 and the third diaphragm 13, and the second diaphragm 12 has at least two bending structures 120, which are adapted to refract the light transmitted between the first diaphragm 11 and the third diaphragm 13 multiple times, thereby significantly attenuating the intensity of the transmitted light.

[0037] In this embodiment, the Fresnel diaphragm structure 1 is integrally cut from a single Fresnel diaphragm sheet. The first diaphragm 11 is connected to the light receiving sensor 7, and the third diaphragm 13 is connected to the light emitting sensor 6. The overall structure is simple, reducing the difficulty of processing and assembly, and is suitable for mass production. The second diaphragm 12 is provided with at least two bending structures 120. The bending structures 120 can refract the transmitted light between the first diaphragm 11 and the third diaphragm 13 multiple times, significantly attenuating the intensity of transmitted light, effectively suppressing light leakage and optical crosstalk, and improving the signal-to-noise ratio, thereby ensuring the accuracy and reliability in optical measurement scenarios such as heart rate monitoring.

[0038] Specifically, the Fresnel pattern diaphragm structure 1 of this invention achieves efficient isolation between light reception and emission. It is integrally cut from a single Fresnel pattern diaphragm and includes a first diaphragm 11, at least one second diaphragm 12, and a third diaphragm 13 arranged coaxially. The first diaphragm 11 and the third diaphragm 13 are isolated from each other by a hollowed-out area, and the third diaphragm 13 is located within the inner circle of the first diaphragm 11. The first diaphragm 11 is connected to a light receiving sensor 7, and the third diaphragm 13 is connected to a light emitting sensor 6. The overall structure is simple, reducing processing and assembly difficulty, and is suitable for mass production. The light receiving sensor 7 is preferably a heart rate lamp. The light emitting sensor 6 is preferably a heart rate lamp PD. The cutting process of the Fresnel pattern diaphragm is prior art in this application and will not be further described here.

[0039] The second diaphragm 12 is provided with at least two bending structures 120. The bending structures 120 refract the light transmitted between the first diaphragm 11 and the third diaphragm 13 multiple times, thereby significantly blocking and attenuating the intensity of transmitted light between the light emitting sensor 6 and the light receiving sensor 7, fundamentally reducing the risk of light leakage, effectively suppressing light leakage and optical crosstalk, improving the signal-to-noise ratio, and ensuring the accuracy and reliability in optical measurement scenarios such as heart rate monitoring.

[0040] It is worth noting that the coaxiality of the first diaphragm 11 and the third diaphragm 13 is achieved through a high-precision cutting process, ensuring precise alignment of the optical axis and reducing measurement errors. The shape and size of the hollowed-out area are carefully designed to balance the amount of light transmitted and the optical path length, achieving optimal light attenuation. The geometry and physical properties of the bending structure 120 of the second diaphragm 12 are also optimized, following optical principles to achieve effective control of light. The second diaphragm 12 significantly attenuates the intensity of transmitted light through multiple refractions and reflections, effectively suppressing light leakage and optical crosstalk. Theoretically, the reasonable combination of reflectivity and refractive index, as well as the energy loss law of light after multiple reflections, effectively improves the signal-to-noise ratio. In heart rate monitoring scenarios, this reduces interference from light reflected from the skin surface, improving measurement accuracy; in industrial testing, it enables precise measurement of specific optical characteristics.

[0041] Further, refer to Figure 2 and Figure 3 The bending structure 120 has a bending angle, preferably a right angle.

[0042] In this embodiment, the bending angle of the bending structure is preferably a right angle. A right angle has the best light blocking effect, which can effectively reduce the transmission and scattering of light and block the light of the first diaphragm 11 and the third diaphragm 13.

[0043] Specifically, the bending angle is preferably a right angle, which not only enhances the stability of the Fresnel pattern membrane structure 1, but also helps to optimize the light propagation path, causing the light to undergo multiple reflections and refractions at the bending structure 120, thereby further improving the light blocking effect. The second membrane 12 has two bending structures 120. After two refractions through the two bending structures 120, the light undergoes multiple refractions when passing through the second membrane 12, thereby gradually weakening the light intensity, effectively dispersing the light, and reducing the possibility of direct light transmission. Specifically, the second diaphragm 12 includes a first part 121, a second part 122, and a third part 123. The outer end of the first part 121 is connected to the first diaphragm 11, and the inner end of the third part 123 is connected to the third diaphragm 13. The first part 121 and the third part 123 are parallel to each other and both extend along the radial direction of the first diaphragm 11. The second part 122 is perpendicular to the first part 121 and the third part 123. The second part 122 bridges the first part 121 and the third part 123, so that the second diaphragm 12 is Z-shaped. That is, the first part 121 and the third part 123 form a Z-shaped optical path with two right-angle bending angles through the second part 122, which forces the light to undergo at least two directional changes in a limited space. Through multiple reflections and refractions, the light energy is greatly consumed, thereby efficiently attenuating the stray light that directly enters the receiving sensor from the transmitting sensor, ensuring the purity of signal detection.

[0044] It is worth noting that the bending structure 120 has a bending angle of 60°-120°. This angle range ensures that light undergoes multiple efficient reflections and refractions within the bending structure 120, significantly attenuating the transmitted light intensity, while also considering material stability and fabrication feasibility. Specifically, the 60° to 120° angle range complicates the light path and increases propagation loss, effectively suppressing light transmission while avoiding excessive fabrication difficulty or insufficient structural strength. This is particularly important in optical measurement or signal isolation scenarios, effectively improving the signal-to-noise ratio and measurement accuracy.

[0045] Furthermore, at this time, the second diaphragm 12 undergoes multiple steep-angle reflections and refractions on the bending structure 120, greatly extending the light path and effectively attenuating the intensity of transmitted light. The number of bending structures 120 is not further limited in this application, as long as the bending structure 120 can ensure the mechanical connection between the first diaphragm 11 and the third diaphragm 13 while blocking light transmission between them. A Z-shaped second diaphragm 12 is the optimal solution, but the second diaphragm 12 includes, but is not limited to, a Z-shape. It can also be a multi-level Z-shaped stepped structure, a wave-shaped or arc-shaped structure, an inclined zigzag structure, a spiral structure, a composite labyrinth structure, etc., all of which are within the inventive concept and protection scope of this application. A multi-level Z-shaped stepped structure greatly extends the light path by increasing the number of bends. A wave-shaped or arc-shaped structure replaces sharp angles with smooth bends. An inclined zigzag structure breaks the completely radial and vertical layout, introducing an inclined angle, so that the parts of the second diaphragm 12 are not parallel or perpendicular to the radial direction. For example, the portion connecting the first and third diaphragms 13 could be an oblique line at a certain angle (e.g., 45°) to the radial direction, followed by a bend at another oblique angle for connection. The spiral structure can be viewed as a combination of multiple arc-shaped structures with different radii of curvature. The second diaphragm 12 starts from the inner edge of the first diaphragm 11, extends inward along a spiral path, and finally connects to the outer edge of the third diaphragm 13. The composite labyrinth structure, along the path of the second diaphragm 12, simultaneously includes straight bends, curved segments, and possibly small light-absorbing cavities or textures. For example, it could begin with a Z-shaped section followed by a wave-like section, or have tiny light-absorbing teeth or rough surfaces created on the inner side of the bends.

[0046] In a modified embodiment, taking a second diaphragm 12 with a multi-level Z-shaped stepped structure as an example, the second diaphragm 12 has four bending structures 120. The second diaphragm 12 includes a first part, a second part, a third part, a fourth part, and a fifth part connected sequentially. The first part, the third part, and the fifth part all extend along the radial direction of the first diaphragm 11; the second part is perpendicular to the first and third parts, and the fourth part is perpendicularly connected to the second and fifth parts. In this case, the second diaphragm 12 greatly extends the optical path by increasing the number of bending structures 120. Specifically, the second diaphragm 12 forms a stepped continuous bending optical path with four right-angle bends, which can force light to undergo multiple sharp reflections and refractions between adjacent parts, greatly extending the internal optical path, significantly improving the light blocking performance, and effectively suppressing transmitted light crosstalk. In addition, the multi-angle refraction along the radial and vertical directions further optimizes the optical path control and improves the optical performance. It is particularly suitable for scenarios with high requirements for light isolation, such as optical sensors in heart rate monitoring, which can improve the signal-to-noise ratio and ensure the accuracy and reliability of measurement results. Meanwhile, the multi-segment folding of the second diaphragm 12 helps to disperse stress, which is beneficial to enhancing the mechanical stability of the second diaphragm 12 and avoiding deformation caused by stress concentration.

[0047] Preferably, there are two second diaphragms 12, symmetrically arranged on both sides of the central axis of the third diaphragm 13. This symmetrical arrangement not only allows light to be refracted and reflected multiple times when passing through the bending structure 120, further weakening the intensity of transmitted light, but also balances stress through a naturally symmetrical geometric distribution, enhancing the mechanical connection strength between the first diaphragm 11 and the third diaphragm 13, effectively preventing deformation or loosening caused by structural stress concentration, and improving the stability of the entire Fresnel diaphragm structure 1.

[0048] Further, refer to Figure 4 and Figure 5 This application provides an optical component, including a Fresnel pattern diaphragm structure 1, a first glass 2, a first black water-absorbing foam adhesive 3, and a second black water-absorbing foam adhesive 4 as described in any of the above embodiments; the outer periphery of the first diaphragm 11 of the Fresnel pattern diaphragm structure 1 is adhered and fixed to the first glass 2 by the first black water-absorbing foam adhesive 3, and the second diaphragm 12 is adhered and fixed to the first glass 2 by the second black water-absorbing foam adhesive 4.

[0049] In this embodiment, the first diaphragm 11 and the second diaphragm 12 of the Fresnel pattern diaphragm structure 1 are respectively attached and fixed to the first glass 2 by the first black water-absorbing foam adhesive 3 and the second black water-absorbing foam adhesive 4, which further absorbs residual light and prevents light from passing through the Fresnel pattern diaphragm structure or leaking out from the edge, thereby slowing down or blocking the light emitted by the light emission sensor, realizing that the film on the glass does not leak light and realizing mass production.

[0050] Specifically, the first diaphragm 11 and the second diaphragm 12 of the Fresnel pattern diaphragm structure 1 are tightly bonded to the first glass 2 using the first black spore foam adhesive 3 and the second black spore foam adhesive 4, respectively. This not only ensures a seamless connection between the Fresnel pattern diaphragm structure 11 and the first glass 2, eliminating bubbles and gaps that could lead to light leakage, but also allows the special material of the black spore foam adhesive to effectively absorb residual light, preventing light from escaping from the edges. The first black spore foam adhesive 3 and the second black spore foam adhesive 4 not only achieve a strong bond between the Fresnel pattern diaphragm structure 1 and the first glass 2, but also more effectively absorb residual reflected light and stray light at the interface, fundamentally preventing light from passing through the Fresnel pattern diaphragm structure 1 or leaking from the assembly gaps, significantly improving optical isolation. Moreover, the Fresnel pattern diaphragm structure 1 with the bending structure 120 further enhances the light reflection and refraction paths, minimizing light transmission. This not only improves the accuracy of optical measurements but also provides a reliable optical isolation solution for applications such as heart rate monitoring, ensuring the mass production efficiency and quality of film application on glass. The first black hydrophobic foam adhesive 3 adheres to the outer periphery of the first diaphragm 11, preventing it from lifting. The second black hydrophobic foam adhesive 4 adheres to the second diaphragm 12, also preventing the third diaphragm 13 from being directly bonded to the second glass, thus providing space for connecting other components to the third diaphragm 13.

[0051] Furthermore, it also includes a second glass and a third black water-collecting foam adhesive 5, with the side of the second diaphragm 12 facing away from the first glass 2 being adhered and fixed to the second glass by the third black water-collecting foam adhesive 5.

[0052] In this embodiment, the side of the second diaphragm 12 facing away from the first glass 2 is fixed to the second glass by a third black foam adhesive, thereby forming a double-sided clamping and fixing of the Fresnel pattern diaphragm structure 1 together with the first glass 2, which enhances the rigidity and stability of the overall component, avoids displacement caused by external vibration or temperature change, and further blocks potential light leakage paths.

[0053] Specifically, the optical component adopts a sandwich design, consisting of a first glass 2, a second glass, a Fresnel-patterned diaphragm, and black water-collecting foam adhesive to form a stable mechanical structure, while achieving efficient optical isolation.

[0054] It also includes two light emitting sensors 6 and four light receiving sensors 7. The two light emitting sensors 6 are correspondingly located in the central region of the third diaphragm 13 of the Fresnel pattern diaphragm structure 1, and the four light receiving sensors 7 are circumferentially spaced and located on the outer periphery of the first diaphragm 11. The two light emitting sensors 6 are placed at the center of the third diaphragm 13, and the four light receiving sensors 7 are evenly distributed on the outer periphery of the first diaphragm 11. This layout works in conjunction with the Z-shaped bending structure 120 of the diaphragm to effectively suppress direct crosstalk between the emitting and receiving light paths, ensuring a high signal-to-noise ratio and measurement accuracy when performing heart rate monitoring on the glass surface, optimizing signal acquisition efficiency, improving the signal-to-noise ratio, and meeting the high-precision measurement requirements of scenarios such as heart rate monitoring. In addition to its adhesive function, the black water-absorbing foam adhesive also has optical absorption and stress buffering functions, further enhancing the component performance.

[0055] Furthermore, this application provides a smart device including the optical components in any of the above embodiments.

[0056] Specifically, this embodiment achieves a component design that can maintain excellent light-blocking performance even under harsh optical environments by using a multi-layer black foam adhesive light-absorbing bonding and a double glass clamping structure, combined with a specially designed Fresnel pattern diaphragm structure 1. This provides a feasible solution for mass production of reliable heart rate monitoring on glass surfaces for smart wearable devices.

[0057] It is worth noting that the Fresnel diaphragm structure 1 and optical components are not only suitable for heart rate monitoring, but can also be extended to fields such as industrial inspection, consumer electronics, and optical instruments. For example, in mobile phone infrared sensors, its anti-crosstalk design can be used to improve signal accuracy; in spectrometers, it can be used as an optical attenuator to adjust light intensity and meet different measurement needs. This application does not make further limitations herein.

[0058] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of this utility model. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A Fresnel patterned film sheet structure, characterized by, It includes a first membrane, at least one second membrane, and a third membrane, all integrally cut from the same Fresnel membrane sheet; The first diaphragm and the third diaphragm are coaxially arranged and isolated from each other by a hollow area. The third diaphragm is located in the inner circle of the first diaphragm. The first diaphragm is adapted to connect to a light receiving sensor and the third diaphragm is adapted to connect to a light emitting sensor. The second diaphragm is connected between the first diaphragm and the third diaphragm. The second diaphragm has at least two bending structures that are adapted to refract light transmitted between the first diaphragm and the third diaphragm multiple times, thereby significantly attenuating the intensity of transmitted light.

2. The Fresnel-patterned diaphragm structure according to claim 1, characterized in that, The bending structure has a bending angle, which is a right angle.

3. The Fresnel-patterned diaphragm structure according to claim 2, characterized in that, The second diaphragm has two bending structures. The second diaphragm includes a first part, a second part, and a third part. The outer end of the first part is connected to the first diaphragm, and the inner end of the third part is connected to the third diaphragm. The first part and the third part are parallel to each other and both extend in the radial direction of the first membrane; the second part is perpendicular to the first part and the third part, so that the second membrane is Z-shaped.

4. The Fresnel-patterned diaphragm structure according to claim 2, characterized in that, The second diaphragm has four bending structures, and the second diaphragm includes a first part, a second part, a third part, a fourth part and a fifth part connected in sequence. The first part, the third part and the fifth part all extend along the radial direction of the first diaphragm. The second part is perpendicular to the first part and the third part, and the fourth part is perpendicularly connected to the second part and the fifth part.

5. The Fresnel-patterned diaphragm structure according to claim 1, characterized in that, There are two second diaphragms, which are symmetrically arranged on both sides of the central axis of the third diaphragm.

6. The Fresnel-patterned diaphragm structure according to claim 1, characterized in that, The bending structure has a bending angle of 60°-120°.

7. An optical assembly, comprising: Includes the Fresnel-patterned diaphragm structure as described in any one of claims 1-6, the first glass, the first black water-collecting foam adhesive, and the second black water-collecting foam adhesive; The outer periphery of the first diaphragm of the Fresnel pattern diaphragm structure is fixed to the first glass by the first black water-absorbing foam adhesive, and the second diaphragm is fixed to the first glass by the second black water-absorbing foam adhesive.

8. An optical component according to claim 7, characterized in that, It also includes a second glass and a third black water-collecting foam adhesive, wherein the side of the second diaphragm facing away from the first glass is fixed to the second glass by the third black water-collecting foam adhesive.

9. An optical component according to claim 7, characterized in that, It also includes two light emitting sensors and four light receiving sensors. The two light emitting sensors are respectively disposed in the central region of the third membrane of the Fresnel pattern membrane structure, and the four light receiving sensors are circumferentially spaced and disposed on the outer periphery of the first membrane.

10. A smart device, comprising: Includes the optical components described in any one of claims 7-9.

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