A brush palm device using a cover plate to supplement light

Abstract

A kind of brush palm equipment using cover plate to light, including: shell;The shell includes cover plate and side wall;Multiple LED light sources, fixed on the side wall, for emitting light;Light guide plate is arranged on the light path of the LED light source;The bottom surface of the light guide plate is provided with light guide point, to make light scatter inside the light guide plate;The bottom surface outside of the light guide plate is provided with reflective film, to make light total reflection back into the light guide plate;Sensor is towards the cover plate, for receiving the reflection signal of palm.The utility model can improve light efficiency, increase light supplement area, under reaching same illumination condition, make that white light is no longer dazzling.

Description

Technical Field

[0001] This utility model relates to the field of palm recognition technology, specifically to a palm-scanning device that utilizes a cover plate for supplementary lighting. Background Technology

[0002] Palm recognition technology, especially palm vein recognition technology, has seen significant development and application in recent years, becoming an important branch of the biometrics field.

[0003] Palm recognition technology, including palmprint recognition and palm vein recognition, primarily utilizes the biometric features of the palm for identity authentication. Palm vein recognition works by illuminating the palm veins with near-infrared light through the skin. The difference in absorption rate of near-infrared light by hemoglobin forms a vein image, which is then compared with vein information stored in a system to achieve identity verification. This technology features high accuracy, high security, uniqueness, and stability.

[0004] Palm recognition technology has several advantages:

[0005] High precision: Palm vein recognition technology boasts extremely high recognition accuracy, far exceeding traditional methods such as passwords and fingerprints. Statistics show its accuracy rate can reach 99.9999%.

[0006] High security: Palm vein features are unique and stable, and are hidden beneath the skin of the palm, making them difficult to forge and steal. Furthermore, palm vein recognition is a liveness detection technology; only palm veins from living individuals can be successfully identified, further enhancing security.

[0007] Convenience: Palm vein recognition requires no contact with the device; simply extending the palm completes the recognition process, making it quick and easy. Furthermore, this technology is unaffected by factors such as light or skin condition, making it widely applicable.

[0008] For the supplementary lighting of the palm brush device, multiple LED lights are usually used to form a light strip. To achieve a uniform light effect, a light diffuser needs to be added. In order to achieve a better uniform light effect, some light-diffusing agent material needs to be added to the light diffuser to homogenize the light. However, this usually results in some loss of light efficiency and excessively glaring light.

[0009] 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

[0010] Therefore, this utility model improves light efficiency and increases the supplementary light area by designing a combination of edge-emitting light strip and light guide plate, so that white light is no longer dazzling under the same lighting conditions.

[0011] This utility model provides a palm brushing device that utilizes a cover plate for supplemental lighting, characterized in that it includes:

[0012] The housing includes a cover plate and side walls;

[0013] Multiple LED light sources are fixed on the side wall to emit light;

[0014] A light guide plate is disposed in the optical path of the LED light source;

[0015] The bottom surface of the light guide plate is provided with light guide points to scatter light inside the light guide plate;

[0016] A reflective film is provided on the outer side of the bottom surface of the light guide plate to make the light completely reflected back into the light guide plate;

[0017] A sensor, facing the cover plate, is used to receive reflected signals from the palm.

[0018] Optionally, the palm brushing device that utilizes a cover plate for supplemental lighting is characterized in that the sensor is located at the center of the light guide plate.

[0019] Optionally, the palm brushing device using a cover plate for supplemental lighting is characterized in that, along the straight line between the LED light source and the sensor, the density of the light guide points is greater in the central region than in the lateral regions.

[0020] Optionally, the palm brushing device that utilizes a cover plate for supplemental lighting is characterized in that the light guide plate has a reflective portion around the sensor for reflecting light onto the cover plate.

[0021] Optionally, the palm brushing device that utilizes a cover plate for supplemental lighting is characterized in that at least two of the light guide points have different areas.

[0022] Optionally, the palm brushing device using a cover plate for supplemental lighting is characterized in that the light guide points are not evenly distributed on the light guide plate.

[0023] Optionally, the palm brushing device using a cover plate for supplemental lighting is characterized in that the reflectivity of the light guide point is inversely proportional to the distance from the LED light source.

[0024] Optionally, the palm brushing device that utilizes a cover plate for supplemental lighting is characterized in that the emission direction of the LED light source is parallel to the cover plate.

[0025] Optionally, the aforementioned palm brushing device using a cover plate for supplemental lighting is characterized in that the light guide plate includes a light-diffusing structure for scattering and uniformly distributing light.

[0026] Optionally, the palm brushing device using a cover plate for supplemental lighting is characterized in that at least two of the LED light sources have different brightness levels.

[0027] Optionally, the palm brushing device using a cover plate for supplemental lighting is characterized in that it further includes a lampshade for reflecting the light emitted by the LED light source into the light guide plate.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] This invention eliminates the need for complex light processing procedures, thus improving luminous efficiency. Furthermore, it creates a surface light source, resulting in better light field uniformity, increased luminous area, reduced glare, and a better user experience.

[0030] Conventional ring-shaped supplemental lighting results in a dark spot at the center of the ring, affecting its uniformity, which is only around 50%. In this practical model, the light guide plate panel supplemental lighting can make the light field more uniform, reaching close to 100%. At the same time, the panel area can be 3-5 times that of the ring-shaped light-emitting area, and the subjective effect is softer when the light emission reaches the same illuminance. Attached Figure Description

[0031] 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:

[0032] Figure 1 This is a schematic diagram of the structure of a palm brushing device that utilizes a cover plate for supplementary lighting in an embodiment of this utility model;

[0033] Figure 2 This is a schematic diagram showing the position of a light guide point in one embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of an optical path in an embodiment of the present invention.

[0035] 1-Shell;

[0036] 2-LED light source;

[0037] 3-Light guide plate;

[0038] 4-Light guide points;

[0039] 5-Reflective film;

[0040] 6-Sensors;

[0041] 7-Reflective part;

[0042] 8-Lampshade; Detailed Implementation

[0043] 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.

[0044] 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.

[0045] This utility model provides a palm brushing device that utilizes a cover plate for supplemental lighting, aiming to solve the problems existing in the prior art.

[0046] 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.

[0047] This invention improves light efficiency and increases the supplementary light area by combining edge-emitting light strip with a light guide plate, thus making white light less glaring under the same lighting conditions.

[0048] Figure 1 This is a schematic diagram of a palm-brushing device that utilizes a cover plate for supplementary lighting, as described in an embodiment of this utility model. Figure 1 As shown, an embodiment of this utility model includes a palm-brushing device that utilizes a cover plate for supplemental lighting, comprising:

[0049] Shell 1.

[0050] Specifically, the housing includes a cover plate and side walls. Housing 1 houses and protects internal components such as LED light sources, light guide plates, and sensors. The housing can be of various shapes, such as cuboids or cylinders. It is generally made of robust and durable materials, such as metal or high-strength plastics, to resist external impacts and prevent damage to internal components. The housing design should consider heat dissipation requirements to ensure the stability of the module during long-term operation. The cover plate, located at the top of the device, is the part directly in contact with the user. It is designed to be flat and easy to clean, allowing light to pass through for capturing palm images. The side walls surround the cover plate, forming a closed or semi-closed space to protect internal components from external interference and to secure the LED light source.

[0051] Multiple LED light sources 2 are fixed on the side wall for emitting light.

[0052] Specifically, the LED light source is fixed to the side wall of the housing and illuminates the palm by emitting light so that the sensor can clearly capture the image or features of the palm. LED light sources offer advantages such as low power consumption, long lifespan, and high brightness, making them ideal for such devices. Furthermore, the LED light source can be adjusted as needed to provide light with different brightness and color temperatures to adapt to different environments and application scenarios. The LED can be an infrared LED or a white LED, or it can include both infrared and white LEDs simultaneously, each used for different signal acquisition purposes to improve image quality and reduce the influence of ambient light.

[0053] The light guide plate 3 is disposed in the light path of the LED light source.

[0054] Specifically, the light guide plate is located in the light path of the LED light source. Its main function is to evenly distribute the light emitted by the LED light source onto the entire plate surface, thereby achieving uniform illumination of the palm. Light from multiple LED light sources enters the same light guide plate. Light guide points 4 are provided on the bottom surface of the light guide plate. These light guide points can change the direction of light propagation, causing the light to scatter inside the light guide plate, thus achieving a uniform illumination effect. In addition, the light guide plate also features high light transmittance and a thin profile, which is beneficial for achieving compact design and high-efficiency lighting in equipment. See [link to diagram for light guide point 4 distribution] for details. Figure 2 .

[0055] A reflective film 5 is provided on the outer side of the bottom surface of the light guide plate so that the light is completely reflected back into the light guide plate.

[0056] Specifically, the reflective film is placed on the outer bottom surface of the light guide plate. Its main function is to prevent light from leaking out from the bottom of the light guide plate, while allowing any leaked light to return to the interior of the light guide plate through total internal reflection, thereby improving light utilization and illumination effect. The reflective film is typically made of high-reflectivity materials, such as aluminum foil or polyester film. These materials have excellent reflective properties, effectively reflecting light back into the light guide plate, reducing light loss and improving illumination efficiency.

[0057] Sensor 6, facing the cover plate, is used to receive reflected signals from the palm.

[0058] Specifically, the sensor is one of the core components of the palm-swiping device. It faces the cover plate and receives reflected signals from the palm. When the palm is placed over the cover plate, the light emitted by the LED light source illuminates the palm and generates reflected light signals. These reflected light signals are then captured by the sensor and converted into electrical signals for processing and analysis. Sensors typically feature high sensitivity, high resolution, and fast response, enabling them to accurately capture images or feature information of the palm. This processed information can be used in various applications such as identity verification and payment verification. Furthermore, the sensor needs to possess good stability and durability to ensure long-term stable operation of the device. The sensor can be an infrared camera module or an RGB camera module, or it can include both infrared and RGB camera modules simultaneously, used to capture palm prints and vein patterns for image analysis and identity verification.

[0059] This embodiment utilizes a miniaturized and highly integrated design, making the device easy to install and integrate into various applications. By optimizing the light source and optical path design, this embodiment reduces light loss and improves light efficiency, thereby lowering energy consumption. Through the use of a high-efficiency light guide plate and reflective film, this embodiment achieves uniform illumination, thus improving image quality and recognition accuracy.

[0060] In some embodiments, such as Figure 2 As shown, the sensor is located in the center of the light guide plate. Because the light guide plate can evenly distribute light, the sensor, positioned centrally, receives uniform illumination, thus improving the brightness and uniformity of the palm image. Placing the sensor in the center of the light guide plate helps minimize light loss during transmission, effectively utilizing every beam of light and improving the overall light efficiency of the device. The central configuration of the sensor and light guide plate allows for a more compact internal structure, enabling miniaturization of the palm-scanning device and easy integration into various scenarios, such as subway turnstiles and convenience stores. The central sensor layout reduces the need for additional optical elements to guide or reflect light onto the sensor, simplifying optical system design and reducing cost and complexity.

[0061] In some embodiments, the density of light guide points along the straight line between the LED light source and the sensor is greater in the central region than in the lateral regions. Increasing the density of light guide points in the central region allows for a more uniform light distribution, reducing brightness unevenness. This is crucial for image quality, especially in biometric technologies requiring uniform illumination to clearly capture palm images. The light guide plate is designed to evenly distribute the light emitted by the LED onto the area to be illuminated. The microstructure design of the light guide points allows light to scatter within the light guide plate; the increased density of light guide points in the central region helps to diffuse light more effectively, achieving efficient light utilization and uniform illumination. When the sensor is located in the center of the light guide plate, the increased density of light guide points in the central region ensures that the light intensity received by the sensor is more concentrated and uniform, which helps to improve the brightness of the target area during imaging, resulting in a clearer image. Uniform and concentrated illumination better highlights details in the image, which is particularly important for palm print and vein pattern recognition in biometric technologies. Every detail of the image is clearly captured, thereby improving the accuracy and reliability of the recognition algorithm.

[0062] In some embodiments, the light guide plate has a reflective portion 7 around the sensor to reflect light to the cover plate. The reflective portion is located at the part of the light guide plate that contacts the sensor. When light travels within the light guide plate, downward-facing light is reflected by the reflective film, but some light continues to propagate forward and reaches the area near the sensor. At this point, the reflective portion can uniformly reflect this light upwards out of the light guide plate. The shape and material selection of the reflective portion have a significant impact on its performance. Typically, the reflective portion is made of a high-reflectivity material, such as a mirror material or a material with a microstructured reflective surface. In terms of shape, the reflective portion may be designed as an arc, cone, or other shape to better guide light to the cover plate. The position and size of the reflective portion need to be precisely calculated and designed based on the sensor's position, the distribution of the LED light source, and the size of the cover plate. It is essential to ensure that the reflective portion can effectively reflect light to the area where the palm is located, while avoiding unnecessary shadows or reflections.

[0063] In some embodiments, at least two of the light guide points have different areas. By designing light guide points of different sizes, the diffusion and reflection of light can be more precisely controlled, thereby reducing uneven brightness. Larger light guide points reflect more light, while smaller light guide points provide fine-tuning at details to ensure uniform light distribution. Light guide points of different sizes can be used in better coordination to efficiently utilize the light emitted by the LED. Larger light guide points are responsible for concentrating and reflecting light onto the cover plate, while smaller light guide points are used to adjust and optimize the light propagation path, reducing light energy waste. By precisely controlling the light distribution, light guide points of different sizes can better highlight the details in the palm image, which is crucial for palmprint and vein pattern recognition in biometric technology, helping to improve the accuracy and reliability of recognition.

[0064] In some embodiments, the light guide points are non-equidistantly distributed on the light guide plate. Since the LED light source in this embodiment consists of multiple independent light sources, the light illuminating the interior of the light guide plate is uneven. The non-equidistant distribution of the light guide points allows for more precise control of light diffusion and reflection, thereby reducing brightness unevenness. This distribution method concentrates more light in specific areas while fine-tuning in other areas, ensuring uniform light distribution. The non-equidistant distribution of the light guide points allows for better coordination and efficient utilization of the light emitted by the LEDs. Larger light guide points are used in areas requiring more light, while smaller light guide points are used in other areas to adjust and optimize the light propagation path, reducing light energy waste.

[0065] In some embodiments, the reflectivity of the light guide point is inversely proportional to the distance from the LED light source. The light guide point is located at the bottom of the light guide plate and propagates light upwards through reflection, thus illuminating the palm. Since the light intensity gradually decreases as it propagates through the light guide plate, the closer to the sensor, the lower the light intensity. To ensure the uniformity of the emitted light, the reflectivity of the light guide point is higher the farther it is from the LED light source, resulting in a higher proportion of light being emitted.

[0066] In some embodiments, the LED light source emits light in a direction parallel to the cover plate. When light is emitted in a direction parallel to the cover plate, it is more likely to undergo multiple reflections and scatterings within the light guide plate or reflective layer, thereby increasing the propagation distance and coverage area of ​​the light within the device. This helps reduce direct light loss and improves light utilization efficiency.

[0067] In some embodiments, the light guide plate includes a light-diffusing structure for scattering and uniformly distributing light. The light guide plate typically has numerous diffusion points or dots on its bottom surface or inside. These points / dots can be circular, square, or other shapes, and are created using methods such as laser dotting or screen printing. The distribution and density of the diffusion points / dots are adjusted according to the specific application requirements of the light guide plate. Generally, the dot distribution increases from sparse to dense from the near side to the far side of the light source to ensure that the light gradually diffuses and distributes evenly during propagation. The material and shape of the diffusion points / dots affect the scattering effect and uniformity of the light. High-reflectivity, non-absorbent materials and appropriate shape design can maximize the utilization and uniformity of light. The incident surface of the light guide plate (i.e., the interface where light enters the light guide plate) is typically treated with microstructures, such as prism structures or microlens arrays. These microstructures can increase the incident angle of the light, improve the reflectivity of the light, and guide the light to undergo multiple reflections and scatterings inside the light guide plate. After multiple reflections and scatterings, the light gradually diffuses and distributes evenly inside the light guide plate. Finally, light is emitted from the light guide plate's exit surface (i.e., the interface from which light is emitted), forming a uniform surface light source.

[0068] In some embodiments, at least two of the LED light sources have different brightness levels. LED light sources with different brightness levels can also be used to achieve adaptive lighting. This means that the system can automatically adjust the brightness of the light sources based on the position, posture, or ambient lighting conditions of the hand to optimize the lighting effect. For example, in low ambient light, the brightness of the LED light sources can be increased to ensure the clarity of the hand image; while in bright ambient light, the brightness of the light sources can be appropriately reduced to avoid overexposure. When the LED light sources are arranged with different brightness levels, a gradual lighting effect can also be achieved. This gradual effect can be achieved by gradually adjusting the brightness of the light sources or by selecting light sources with different brightness levels. In palm-scanning devices, gradual lighting can help reduce discomfort caused by sudden changes in light and improve the quality of hand image acquisition. By configuring LED light sources with different brightness levels, the illuminated area can be divided into different brightness zones. For example, in a palm-scanning device, the LED light sources can be arranged in two parts: one part is close to the center area of ​​the hand, using a higher brightness light source to provide sufficient brightness to capture the detailed features of the hand; the other part covers the edge or background area of ​​the hand, using a lower brightness light source to reduce shadows and reflections while maintaining overall soft lighting.

[0069] In some embodiments, a lampshade 8 is also included to reflect the light emitted by the LED light source into the light guide plate. The lampshade is located outside the LED light source. One of the main functions of the lampshade is to reflect the light emitted by the LED light source. Through specific materials and designs, the lampshade can reflect light in a specific direction, such as the light guide plate, thereby reducing light loss and waste. Through reflection, the lampshade can increase the proportion of light entering the light guide plate, thereby improving the luminous efficacy of the entire lighting system. This means that with the same energy consumption, the system can provide brighter and more uniform illumination.

[0070] like Figure 3 As shown, the light emitted by the LED light source 2 shines into the light guide plate 3. Since some light from the LED light source does not directly enter the light guide plate 3, a lampshade 8 is used to collect the remaining light and reflect it into the light guide plate 3, thereby improving light efficiency. Of the light entering the light guide plate, some shines upwards, some travels parallel to the light source, and some shines downwards. The parallel-traveling light eventually shines on the reflective part 7 near the sensor 6 and is reflected before exiting. The downward-shielding light shines partly on the total internal reflection film 5, undergoes total internal reflection, and shines upwards; the rest shines on the light guide point 4, becoming diffuse reflection. Because each light guide point 4 is of different size and unevenly distributed, the final emitted light is relatively uniform. Figure 3 The example shows part of the optical path of light guide point 4, but it does not mean that the optical path shown is necessarily the correct one. Figure 3 The optical path shown does not mean that all light guide points 4 have the same optical path. Figure 3 The density of the light guide dots also exhibits a characteristic of being denser in the middle and sparser on the sides. It should be noted that... Figure 3 The number and density of light guide points shown are exemplary and do not represent a fixed number or density. Figure 3 The specific values ​​shown only indicate the characteristic of being denser in the middle and sparser on both sides.

[0071] 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.

[0072] 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 palm-brushing device that utilizes a cover plate for supplemental lighting, characterized in that, include: The housing includes a cover plate and side walls; Multiple LED light sources are fixed on the side wall to emit light; A light guide plate is disposed in the optical path of the LED light source; The bottom surface of the light guide plate is provided with light guide points to scatter light inside the light guide plate; A reflective film is provided on the outer side of the bottom surface of the light guide plate to make the light completely reflected back into the light guide plate; A sensor, facing the cover plate, is used to receive reflected signals from the palm.

2. The palm brushing device using a cover plate for supplementary lighting according to claim 1, characterized in that, The sensor is located in the center of the light guide plate.

3. The palm brushing device using a cover plate for supplementary lighting according to claim 2, characterized in that, Along the straight line between the LED light source and the sensor, the density of the light guide points is greater in the central region than in the lateral regions.

4. The palm brushing device using a cover plate for supplementary lighting according to claim 1, characterized in that, The light guide plate has a reflective part around the sensor to reflect light to the cover plate.

5. A palm-brushing device using a cover plate for supplementary lighting according to claim 1, characterized in that, At least two of the light guide points have different areas.

6. A palm-brushing device using a cover plate for supplementary lighting according to claim 1, characterized in that, The light guide points are not evenly distributed on the light guide plate.

7. A palm-brushing device using a cover plate for supplementary lighting according to claim 6, characterized in that, The reflectivity of the light guide point is inversely proportional to the distance from the LED light source.

8. A palm brushing device using a cover plate for supplementary lighting according to claim 7, characterized in that, The LED light source emits light in a direction parallel to the cover plate.

9. A palm brushing device using a cover plate for supplementary lighting according to claim 1, characterized in that, The light guide plate includes a light-scattering structure for scattering and uniformly distributing light.

10. A palm brushing device using a cover plate for supplementary lighting according to claim 1, characterized in that, It also includes a lampshade for reflecting the light emitted by the LED light source into the light guide plate.

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