Spherical brush palm module

Abstract

A spherical brush palm module is characterized in that the spherical brush palm module comprises at least one LED light source assembly, each LED light source assembly comprises a plurality of LED light-emitting units which are annularly distributed and can independently control light emitting, and the LED light source assemblies are used for projecting light rays of different types, different intensities and / or different distribution modes to the space in front of the module; the photoelectric receiver is located in the center of an area defined by the LED light source assembly and used for receiving light signals reflected by the palm and converting the light signals into electric signals; the spherical cover is arranged in front of the LED light source assembly and the photoelectric receiver; the spherical cover is composed of a transparent base body and an optical structure attached to the transparent base body, and the optical structure is used for homogenizing light emitted by the LED light source assembly so that the light can be evenly irradiated to the palm. The central area of the spherical cover is a transparent area so as to ensure that part of light rays can penetrate through and irradiate the photoelectric receiver without hindrance. According to the utility model, the palm can be irradiated more uniformly.

Description

Technical Field

[0001] This utility model relates to the field of palm brush module technology, specifically to a spherical palm brush module. Background Technology

[0002] Palm recognition, as an emerging biometric technology, is gradually being applied in access control systems, payment terminals, and attendance management due to its advantages such as being contactless, convenient, and hygienic. Traditional palm recognition modules typically employ a planar structure, consisting of a standard LED light source, a receiver, and a planar cover. This planar structure has certain limitations in practical applications.

[0003] Traditional palm-scanning modules have a relatively simple LED light source distribution, typically a fixed arrangement, making it difficult to independently control the emission state of each light source. This results in poor uniformity of light projection, potentially leading to inconsistent light intensity in different parts of the palm. For example, the edges of the palm may be insufficiently illuminated, while the center may be overly illuminated, affecting the quality of the reflected light signal and reducing the accuracy and stability of recognition.

[0004] Traditional modules can mostly emit only a single type of light, such as visible light or infrared light. The amount of hand feature information that can be obtained from a single type of light is limited. In some special cases, such as hands with dirt, oil, or different skin tones, it may not be able to accurately identify the hand, resulting in a decrease in recognition rate.

[0005] Traditional planar masks have poor light homogenization capabilities and cannot effectively and evenly illuminate the palm. Uneven light illumination will cause deviations in the light signals reflected from the palm, increasing the difficulty of subsequent signal processing and easily leading to misjudgments.

[0006] Due to design limitations, traditional modules are quite sensitive to ambient light interference. Under different lighting conditions, such as direct sunlight or low light environments, the module's performance will be significantly affected, making it impossible to guarantee stable and reliable recognition results.

[0007] The above background information is provided only to aid in understanding the inventive concept and technical solution of this utility model. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above information was disclosed on the filing date of this patent application, the above background information should not be used to evaluate the novelty and inventiveness of this application. Utility Model Content

[0008] Therefore, this utility model uses at least one set of LED light source components to emit light, and the spherical cover processes the light path to make the light path more compatible with the palm features, so that the palm can be illuminated more evenly. At the same time, the center of the spherical cover is transparent, which, together with the palm, can reduce environmental interference and significantly enhance the anti-interference ability.

[0009] This utility model provides a spherical brush palm module, characterized in that it includes:

[0010] At least one set of LED light source components, each set of LED light source components comprising multiple LED light-emitting units arranged in a ring and independently controllable for emitting light, for projecting different types, intensities and / or distribution patterns of light into the space in front of the module;

[0011] A photodetector, located at the center of the area enclosed by the LED light source assembly, is used to receive the light signal reflected back from the palm and convert it into an electrical signal;

[0012] A spherical cover is positioned in front of the LED light source assembly and the photodetector;

[0013] The spherical cover consists of a transparent substrate and an optical structure attached thereto. The optical structure is used to homogenize the light emitted by the LED light source assembly so as to evenly illuminate the palm.

[0014] The central area of ​​the spherical cover is a transparent area to ensure that some light can pass through unobstructed and illuminate the photodetector.

[0015] Optionally, the spherical brush palm module is characterized in that each group of LED light source components has no less than 3 LED light-emitting units, and each LED light-emitting unit is evenly distributed around the photodetector at equal intervals.

[0016] Optionally, the spherical brush palm module is characterized in that the number of LED light source components is two groups, the two groups of LED light source components are distributed vertically on a plane perpendicular to the central axis of the photoelectric receiver, and the LED light-emitting unit in each group has a different emission angle or position than the corresponding light-emitting unit in the other group.

[0017] Optionally, the spherical brush module is characterized in that the LED light-emitting unit is capable of emitting at least two different types of light among infrared light, visible light and ultraviolet light.

[0018] Optionally, the spherical brush palm module is characterized in that the LED light-emitting unit can emit light in different modes such as pulse, continuous or alternating according to a preset program or external control command.

[0019] Optionally, the spherical brush module is characterized in that the optical structure on the spherical cover includes at least two different types of phosphor regions, and the different types of phosphors emit fluorescence of specific colors and / or intensities under the excitation of different types of light.

[0020] Optionally, the spherical palm brush module is characterized in that the different types of phosphor regions form regular or irregular patterns on the spherical cover, and the patterns correspond to the placement position of the palm or a specific recognition area.

[0021] Optionally, the spherical brush palm module is characterized by further including a signal processing circuit, which is electrically connected to the photodetector and is used to amplify, filter, digitize, and extract features from the electrical signal output by the photodetector.

[0022] Optionally, the spherical brush palm module is characterized in that the transparent substrate is made of polymethyl methacrylate material, and the optical structure is formed on the surface of the transparent substrate by micro-nano processing technology.

[0023] Optionally, the spherical brush palm module is characterized in that the LED light source assembly and the photodetector are both mounted on a printed circuit board, and the printed circuit board adopts a multi-layer structure design.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention employs at least one set of LED light source components, each set containing multiple LED light-emitting units arranged in a ring and independently controllable in their emission. This design allows for flexible adjustment of the light intensity and distribution pattern according to different application scenarios and hand placement. For example, increasing the light intensity at the edge of the palm ensures uniform illumination of the entire palm, improving the quality of reflected light signals and thus significantly enhancing the accuracy and stability of recognition.

[0026] In this invention, the LED light-emitting unit can emit different types of light, such as visible light and infrared light. These different types of light can capture various features of the palm, such as palm prints and subcutaneous blood vessel distribution. By comprehensively utilizing this information, the accuracy and reliability of identification can be effectively improved, especially for palms in special cases, such as those with a lot of dirt or different skin tones, achieving accurate identification.

[0027] In this invention, the spherical mask consists of a transparent substrate and an optical structure attached thereto. This optical structure effectively homogenizes the light emitted by the LED light source assembly. Compared to traditional planar masks, the spherical mask design better adapts to the propagation characteristics of light, ensuring that light is evenly distributed on the palm, reducing errors caused by uneven illumination, and improving recognition accuracy.

[0028] The transparent design of the central area of ​​the spherical mask in this invention allows some light to penetrate unobstructed and illuminate the photoelectric receiver. This design can be used to monitor the intensity and changes of ambient light in real time. By calibrating and compensating for the reflected light signal, it effectively reduces the interference of ambient light on the recognition results and improves the adaptability and stability of the module under different lighting conditions. Attached Figure Description

[0029] 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort. Other features, objects, and advantages of this utility model will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0030] Figure 1 This is a schematic diagram of the structure of a spherical brush palm module in an embodiment of this utility model;

[0031] Figure 2 This is a schematic diagram of the arrangement of LED light-emitting units in an embodiment of this utility model.

[0032] 1-LED light source assembly;

[0033] 2- Photoelectric receiver;

[0034] 3-Spherical mask;

[0035] 4-LED light-emitting units; Detailed Implementation

[0036] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0037] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the utility model described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] This utility model provides a spherical brush palm module, which aims to solve the problems existing in the prior art.

[0039] The technical solutions of this utility model and this application solve the above-mentioned technical problems in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this utility model will now be described with reference to the accompanying drawings.

[0040] like Figure 1 As shown, in this embodiment of the present invention, a spherical brush palm module includes:

[0041] At least one set of LED light source components 1, each set of LED light source components includes multiple LED light-emitting units that are arranged in a ring and can be independently controlled to emit light, for projecting different types, intensities and / or distribution patterns of light into the space in front of the module;

[0042] Photodetector 2 is located at the center of the area enclosed by the LED light source assembly, and is used to receive the light signal reflected back by the palm and convert it into an electrical signal;

[0043] A spherical cover 3 is disposed in front of the LED light source assembly and the photoelectric receiver;

[0044] The spherical cover consists of a transparent substrate and an optical structure attached thereto. The optical structure is used to homogenize the light emitted by the LED light source assembly so as to evenly illuminate the palm.

[0045] The central area of ​​the spherical cover is a transparent area to ensure that some light can pass through unobstructed and illuminate the photodetector.

[0046] Specifically, the spherical palm brush module includes at least one set of LED light source components 1, each set consisting of multiple LED light-emitting units 4. These LED light-emitting units are arranged in a ring, which allows light to be projected into the space in front of the module from multiple angles, forming a relatively comprehensive light coverage area. Each LED light-emitting unit can be independently controlled to emit light. This means that different LED light-emitting units can be made to light up or turn off in a specific order and at specific time intervals through programming or related control circuits, thereby achieving the projection of different types of light (such as visible light, infrared light, and other different wavelengths), different intensities (controlled by adjusting the brightness of individual LED light-emitting units), and / or different distribution patterns (e.g., some areas are bright, some areas are dark, or a specific pattern distribution) into the space in front of the module. This diverse light projection capability provides rich light source conditions for the subsequent acquisition of palm reflected light signals, facilitating the accurate detection of different palm features.

[0047] The photodetector 2 is located at the center of the area enclosed by the LED light source assembly 1. This layout is carefully considered because the light emitted from the LED light source assembly is reflected after hitting the palm. Placing the photodetector in the center maximizes the reception of light signals reflected from various parts of the palm, ensuring comprehensive and accurate signal reception. The main function of the photodetector is to convert the received light signals reflected from the palm into electrical signals. This is a crucial step in enabling the entire module to detect and process palm information. The converted electrical signal can be amplified, filtered, and converted from analog to digital by subsequent circuitry, ultimately used to analyze palm features such as texture and blood vessel distribution.

[0048] The spherical mask 3 consists of a transparent substrate and optical structures attached to it. The transparent substrate provides basic shape support for the entire spherical mask and ensures that light can pass through smoothly. The optical structures attached to the transparent substrate have special optical functions.

[0049] The optical structure is used to homogenize the light emitted by the LED light source component. When the light emitted by the LED light source component shines on the spherical cover, the optical structure redistributes and adjusts the light, which may have been uneven in intensity and irregularly distributed, through optical principles such as refraction and scattering, so that the light ultimately illuminating the palm is evenly distributed. This evenly illuminated light makes the light signals reflected from different parts of the palm more stable and consistent, which is beneficial for the photoelectric receiver to accurately receive and subsequently analyze palm information.

[0050] The central area of ​​the spherical dome is transparent. This transparent area is crucial, ensuring that a portion of light can penetrate unobstructed and reach the photodetector. On one hand, this light serves as a reference beam to calibrate and compensate for the effects of ambient light variations and optical component wear on the photodetector's reception of reflected light signals. On the other hand, it also helps maintain the stability of the photodetector's signal reception in complex lighting environments, ensuring the entire module operates accurately and reliably.

[0051] In some embodiments, each group of LED light source components contains no fewer than three LED light-emitting units, and these units are evenly distributed around the photodetector at equal intervals. In the design of the LED light source components for the spherical brush palm module, there is a specific requirement for the number of LED light-emitting units in each group of LED light source components, namely, no fewer than three. These LED light-emitting units are evenly distributed around the photodetector located at the center of the component. From a layout perspective, as... Figure 2 As shown, when there are three LED light-emitting units, they surround the photodetector at 120° intervals, forming an equilateral triangle vertices. With four LED light-emitting units, the intervals are 90°, creating a square-like distribution. This pattern continues for larger numbers. This layout design offers several advantages. First, from the perspective of light projection angle, multiple evenly distributed LED light-emitting units can project light from different directions into the space in front of the module, ensuring comprehensive light coverage of the palm area. For example, when detecting features at the edge of the palm, LED light-emitting units in different positions can illuminate the edge, avoiding blind spots. Second, in terms of signal acquisition, the equidistant distribution helps obtain more uniform and stable palm-reflected light signals, providing excellent lighting conditions for the photodetector to accurately receive signals and perform subsequent palm feature analysis, greatly improving the module's ability to accurately detect different palm features.

[0052] In some embodiments, the number of LED light source components is two groups, which are arranged vertically on a plane perpendicular to the central axis of the photodetector. The LED light-emitting units in each group have different emission angles or positions compared to the corresponding light-emitting units in the other group. In the spherical brush palm module assembly, the number of LED light source components is set to two groups. These two groups of LED light source components are arranged vertically on a plane perpendicular to the central axis of the photodetector, forming a three-dimensional light source layout structure. More importantly, the LED light-emitting units in each group have different emission angles or positions compared to the corresponding light-emitting units in the other group.

[0053] From the perspective of emission angle, if an LED in the upper LED light source assembly projects light downwards at a 30° angle to the central axis, then the corresponding LED in the lower assembly might project light upwards at a 40° angle to the central axis. This difference in emission angle allows the two light sources to illuminate the palm from different tilt angles, greatly enriching the dimensions of light illumination on the palm. For example, when detecting deep texture details in the palm, the upper light source, projecting downwards at a specific angle, can highlight the concave details of the palm texture; the lower light source, projecting upwards at different angles, can highlight the convex features of the palm texture. The two complement each other, making the palm print features clearer.

[0054] In terms of positioning, one LED light-emitting unit in the upper group of LED light source components is positioned slightly to the left horizontally, while the corresponding LED light-emitting unit in the lower group may be positioned slightly to the right horizontally. This staggered distribution further ensures that all parts of the palm are adequately illuminated. For example, when detecting features on the side edge of the palm, the two light sources illuminate from different horizontal positions, avoiding insufficient illumination or shadows caused by the limited position of a single light source. This provides a strong guarantee for the photoelectric receiver to comprehensively and accurately collect the reflected light signals from the palm, significantly improving the module's detection accuracy and reliability for complex palm features.

[0055] In some embodiments, the LED light-emitting unit is capable of emitting at least two different types of light, namely infrared light, visible light, and ultraviolet light. The LED light-emitting unit in the spherical brush module has extremely rich light emission capabilities, and it is capable of emitting at least two different types of light, namely infrared light, visible light, and ultraviolet light.

[0056] Infrared light, with its unique penetrating power, plays a crucial role in the module. When the LED light-emitting unit emits infrared light, it can penetrate the surface of the palm skin, clearly outlining the distribution of blood vessels inside the palm. This provides extremely valuable data for applications such as identity recognition and health monitoring using vascular features. For example, in the medical field, analyzing the morphology and blood flow velocity of blood vessels in the palm can assist doctors in the early screening and diagnosis of diseases.

[0057] Visible light is the most familiar type of light in people's daily lives. In this module, the visible light emitted by the LED light-emitting unit can clearly illuminate the surface texture of the palm, such as fingerprints and palm prints. These texture features are highly individualized, and in scenarios such as security access control and attendance systems, accurate identification of palm textures under visible light can effectively confirm the user's identity.

[0058] While ultraviolet light is not commonly used in everyday lighting, it plays an irreplaceable role in specific applications. When an LED light-emitting unit emits ultraviolet light, it can excite certain substances on the surface of the palm to produce a fluorescent reaction, thereby revealing subtle features that are difficult to detect under visible light, such as the distribution of trace elements on the skin surface and potential scars. In the field of criminal investigation, this property can be used to extract subtle traces left by the palm at crime scenes, aiding in solving cases.

[0059] By emitting various types of light, the LED light-emitting unit greatly expands the application range of the spherical palm brush module, enabling it to accurately acquire diverse feature information of the palm in different scenarios, significantly improving the module's practicality and functionality.

[0060] In some embodiments, the LED light-emitting unit can emit light in different modes such as pulse, continuous, or alternating, according to a preset program or external control commands. The LED light-emitting unit in the spherical brush module exhibits high flexibility in light emission modes, and can emit light in various different modes such as pulse, continuous, or alternating, according to a preset program or external control commands.

[0061] In pulse mode, the LED light-emitting units emit light intermittently according to a set frequency and duty cycle. For example, they flash rapidly for a short period, followed by a brief period of inactivity, and so on. This mode is particularly useful when instantaneous high-energy light is needed to highlight certain features of the palm. For instance, when detecting details of palm texture, the instantaneous intense light in pulse mode can enhance the contrast of the texture, making subtle texture features clearer and thus improving the accuracy of recognition. In security monitoring scenarios, palms entering the monitoring area can be quickly scanned using pulsed light of a specific frequency, and the dynamic information of the palm can be accurately captured by utilizing changes in reflected light.

[0062] Continuous illumination mode involves the LED light-emitting unit emitting light continuously and stably. In applications requiring long-term stable illumination, such as palm vein recognition systems, continuous illumination mode ensures continuous lighting of the palm, allowing the photodetector to stably receive light signals reflected from the blood vessels inside the palm. This enables accurate acquisition of images of blood vessel distribution, providing a reliable basis for identification. In industrial production lines, continuous illumination mode is also commonly used for detecting and monitoring workers' hand movements, ensuring real-time and stable observation of hand actions and states.

[0063] In alternating mode, the LED light-emitting unit can switch between different types of light (such as infrared, visible, and ultraviolet light) in a specific order and time interval. For example, it might first emit infrared light for a period to acquire information about the blood vessels in the palm, then switch to visible light to capture the surface texture of the palm, and finally emit ultraviolet light to detect subtle features on the palm surface. This mode fully utilizes the characteristics of different types of light to comprehensively and efficiently acquire diverse feature information about the palm. In medical testing scenarios, by emitting light in alternating mode, doctors can acquire multiple health-related data about the palm at once, including vascular condition, changes in skin texture, and the distribution of trace elements, providing rich evidence for comprehensive diagnosis. In intelligent security inspection equipment, alternating light emission can quickly and comprehensively detect passengers' palms, identifying potentially dangerous items or abnormal situations.

[0064] The diverse range of light emission modes enables the LED light-emitting unit to adapt to various complex and ever-changing application scenarios, further enhancing the performance and practicality of the spherical palm brush module and meeting the diverse needs of different fields for palm information collection and analysis.

[0065] In some embodiments, the optical structure on the spherical mask includes at least two different types of phosphor regions. These different types of phosphors emit fluorescence of specific colors and / or intensities when excited by different types of light. Each type of phosphor possesses unique optical response characteristics, emitting fluorescence of specific colors and / or intensities when excited by different types of light. For example, one phosphor might emit a soft green fluorescence when excited by infrared light, while another phosphor might emit a bright yellow fluorescence when excited by specific wavelengths of visible light (such as blue light). This characteristic allows the spherical mask to differentiate and convert different types of light.

[0066] When light emitted by the LED light-emitting unit shines onto the spherical mask, some of the light interacts with the phosphor area. Taking palm texture detection as an example, if the LED light-emitting unit emits light that can excite a certain type of phosphor, that phosphor area will emit fluorescence of a specific color and intensity, thus forming a unique fluorescent pattern on the palm surface. This not only further enhances the contrast of the palm texture, making previously imperceptible fine textures more clearly visible, but also provides richer information dimensions for subsequent photodetectors to receive reflected light signals. In medical testing scenarios, the fluorescence emitted by different phosphors under specific light excitation can more accurately detect the distribution of trace elements under the palm skin. Some trace elements interact with the fluorescence emitted by specific phosphors; by observing changes in fluorescence intensity and color, doctors can obtain information about the content and distribution of trace elements, providing strong support for disease diagnosis. In the security field, the fluorescent patterns produced by the phosphor areas on the spherical mask under specific light excitation can be used to assist in identifying genuine palms. Because real palms and counterfeit palms differ in their fluorescence reflection and absorption characteristics, analyzing the fluorescence characteristics in the reflected light can effectively improve the accuracy and reliability of palm recognition in security systems.

[0067] In some embodiments, the different types of phosphor regions form regular or irregular patterns on the spherical mask, and these patterns correspond to the placement of the palm or specific recognition areas. From the perspective of regular patterns, there may be combinations of phosphor regions with regular shapes such as circles and squares. For example, with the photodetector at the center, several concentric circular phosphor regions are designed on the spherical mask. When the palm is placed in front of the module, different finger or palm parts precisely cover these circular regions. During palm texture recognition, when the phosphor in a specific area is excited, the emitted fluorescence highlights the palm texture details corresponding to that area, facilitating accurate analysis and comparison of textures at different locations. In scenarios such as attendance tracking, employees place their palms in fixed positions, and the phosphor regions corresponding to the regular patterns can quickly locate different parts of the palm, improving recognition efficiency.

[0068] Irregular patterns also possess unique value. They may mimic the contours of a palm or be designed based on common palm feature distribution areas. For example, irregular fluorescent powder patterns resembling the lines of a palm can be placed on a spherical mask, allowing the patterns to naturally conform to the palm when it is placed in that area. In medical testing, to detect the distribution of trace elements in specific areas of the palm, the fluorescence emitted by the corresponding irregular fluorescent powder patterns can accurately reflect the trace element information of that area when the irregular fluorescent powder patterns are excited. In the security field, by corresponding irregular fluorescent powder patterns to specific recognition areas of the palm, the fluorescence characteristics of the reflected light when the palm covers the pattern can more precisely distinguish between genuine palms and counterfeits, greatly improving the accuracy and security of palm recognition in security systems. Through this pattern design corresponding to the palm placement position or specific recognition area, the fluorescent powder areas on the spherical mask can more effectively assist the module in acquiring palm information, improving its performance in different application scenarios.

[0069] In some embodiments, a signal processing circuit is also included. This circuit is electrically connected to the photodetector and is used to amplify, filter, digitize, and extract features from the electrical signal output by the photodetector. When the photodetector converts the light signal reflected back from the palm into an electrical signal, these raw electrical signals are often quite weak and easily affected by various noise interferences. The signal processing circuit first amplifies the electrical signal, using amplifiers and other circuit components to enhance the weak signal to an amplitude level suitable for subsequent processing. This step ensures that critical information is not lost due to the signal being too weak during transmission and processing.

[0070] Subsequently, the filtering process comes into play. Since the original electrical signal may be mixed with noise signals from the surrounding environment, the circuit itself, and other sources, the filtering circuit can remove unwanted noise components according to a preset frequency range, retaining only the effective frequency components related to the light reflected from the palm. For example, a low-pass filter can be used to filter out high-frequency noise, or a band-pass filter can be used to select signals within a specific frequency range, thus making the electrical signal purer and laying the foundation for subsequent precise processing.

[0071] After amplification and filtering, the signal processing circuit performs digital processing. Using devices such as analog-to-digital converters (ADCs), the continuous analog electrical signal is converted into a discrete digital signal. Digital signals have advantages such as strong anti-interference capabilities, ease of storage and processing, and can be more conveniently processed and analyzed in subsequent digital signal processors (DSPs) or microcontrollers (MCUs).

[0072] Finally, the signal processing circuit performs feature extraction. Through specific algorithms and programs, key information characterizing the palm, such as palm texture features and vascular distribution features, is extracted from the digitized electrical signal. This feature information serves as an important basis for subsequent identification, analysis, and judgment. For example, in a palm recognition system, the extracted texture features can be compared with a pre-stored template to achieve identity verification; in medical and health monitoring applications, vascular distribution features can be used to assess the body's health status. Through this series of orderly and precise processing steps, the signal processing circuit greatly improves the quality and availability of the photoelectric receiver's output signal, providing a strong guarantee for the accurate and efficient functioning of the entire spherical palm brush module.

[0073] In some embodiments, the transparent substrate is made of polymethyl methacrylate (PMMA), and the optical structure is formed on the surface of the transparent substrate using micro-nano fabrication processes. The transparent substrate is made of PMMA, a material with numerous significant properties. First, PMMA possesses excellent optical transparency; its high transmittance ensures minimal loss of light emitted from the LED light source assembly and light reflected by the palm when passing through the transparent substrate, guaranteeing high-quality transmission of light signals. Second, PMMA has good mechanical properties; it is tough and possesses a certain degree of impact resistance and abrasion resistance, effectively protecting the optical structure attached to its surface and preventing damage during daily use, thus ensuring the long-term stable operation of the dome. Furthermore, PMMA also has good weather resistance, resisting aging and discoloration due to environmental factors such as light and temperature changes, allowing the dome to maintain the stability of its optical performance under different usage environments.

[0074] The optical structure is formed on the surface of a transparent substrate using micro- and nano-fabrication techniques. Micro- and nano-fabrication is a high-precision manufacturing technology that enables precise processing and construction of materials at the microscale. Using this technology, various intricate and complex optical structures, such as microlens arrays and diffraction gratings, can be fabricated on the surface of a transparent substrate. These micro- and nano-structures can precisely control light, achieving light homogenization and ensuring that light is evenly distributed across the palm. Optical structures formed using micro- and nano-fabrication techniques possess extremely high precision and consistency, ensuring that each optical structural unit accurately performs its optical function, thereby improving the accuracy and reliability of the entire spherical mask in handling light. Simultaneously, micro- and nano-fabrication techniques offer excellent repeatability, enabling large-scale production, reducing production costs, and providing strong support for the widespread application of spherical palm brush modules. Combining a transparent substrate made of PMMA material with optical structures formed using micro- and nano-fabrication techniques provides the spherical palm brush module with superior light processing capabilities, contributing to improved accuracy and stability in palm information detection for the entire module.

[0075] In some embodiments, both the LED light source assembly and the photodetector are mounted on a single printed circuit board, which employs a multi-layered design. This integrated mounting method significantly shortens the electrical connection path between the LED light source assembly and the photodetector, reducing signal transmission losses and interference. This ensures the efficiency and stability of the process from the LED light source assembly emitting light, reflecting it off the palm, to the photodetector receiving the light signal and converting it into an electrical signal. For example, in practical use, a shorter signal transmission path reduces signal delay, allowing the photodetector to respond more quickly to changes in the reflected light from the palm, thus improving the real-time performance of the module's palm information acquisition.

[0076] It is worth mentioning that this printed circuit board adopts a multi-layer structure design. Multi-layer PCBs offer greater routing flexibility. Compared to single-layer or double-layer PCBs, multi-layer PCBs can accommodate more circuit traces within a limited space. In this module, the LED light source components require multiple lines to achieve independent control of different light-emitting units, while the photodetector also requires complex circuit connections for signal transmission and processing. The multi-layer PCB provides ample space for these complex circuit routing needs, allowing for the orderly connection and layout of various circuit functional modules. Simultaneously, the multi-layer structure effectively improves the electrical performance of the PCB. Through reasonable layout, power and signal layers can be separated, reducing the impact of power supply noise on signal transmission. For example, the power layer can be placed closer to the LED light source components to provide them with a stable power supply; while the signal layer is placed closer to the photodetector, ensuring that weak photoelectric signals can be transmitted in a low-interference environment. This significantly improves the performance and reliability of the entire module, laying a solid hardware foundation for accurate palm information detection.

[0077] The various embodiments described in this specification are presented in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0078] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this utility model.

Claims

1. A spherical brush palm module, characterized in that, include: At least one set of LED light source components, each set of LED light source components comprising multiple LED light-emitting units arranged in a ring and independently controllable for emitting light, for projecting different types, intensities and / or distribution patterns of light into the space in front of the module; A photodetector, located at the center of the area enclosed by the LED light source assembly, is used to receive the light signal reflected back from the palm and convert it into an electrical signal; A spherical cover is disposed in front of the LED light source assembly and the photodetector; The spherical cover consists of a transparent substrate and an optical structure attached thereto. The optical structure is used to homogenize the light emitted by the LED light source assembly so as to evenly illuminate the palm. The central area of ​​the spherical cover is a transparent area to ensure that some light can pass through unobstructed and illuminate the photodetector.

2. The spherical brush palm module according to claim 1, characterized in that, Each LED light source assembly contains no fewer than three LED light-emitting units, and each LED light-emitting unit is evenly distributed around the photodetector at equal intervals.

3. A spherical brush palm module according to claim 2, characterized in that, The LED light source assembly consists of two groups, which are arranged vertically on a plane perpendicular to the central axis of the photoelectric receiver. The LED light-emitting units in each group have different emission angles or positions from the corresponding light-emitting units in the other group.

4. A spherical brush palm module according to claim 1, characterized in that, The LED light-emitting unit is capable of emitting at least two different types of light, namely infrared light, visible light, and ultraviolet light.

5. A spherical brush palm module according to claim 4, characterized in that, The LED light-emitting unit can emit light in different modes such as pulse, continuous or alternating, according to a preset program or external control command.

6. A spherical brush palm module according to claim 4, characterized in that, The optical structure on the spherical mask includes at least two different types of phosphor regions, which emit fluorescence of specific colors and / or intensities when excited by different types of light.

7. A spherical brush palm module according to claim 6, characterized in that, The different types of phosphor regions form regular or irregular patterns on the spherical mask, and the patterns correspond to the placement of the palm or a specific recognition area.

8. A spherical brush palm module according to claim 1, characterized in that, It also includes a signal processing circuit, which is electrically connected to the photodetector and is used to amplify, filter, digitize, and extract features from the electrical signal output by the photodetector.

9. A spherical brush palm module according to claim 1, characterized in that, The transparent substrate is made of polymethyl methacrylate, and the optical structure is formed on the surface of the transparent substrate using micro-nano fabrication technology.

10. A spherical brush palm module according to claim 1, characterized in that, Both the LED light source assembly and the photodetector are mounted on a printed circuit board, which has a multi-layer structure design.

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