Palm brushing mold module with side light supplement

Abstract

A palm brushing mold module with side light supplementing, characterized by comprising: a shell, comprising an light emitting surface; a lateral light source located in the shell, emitting active light along a direction parallel to the light emitting surface; a light guide plate for receiving the active light and emitting from the side through the light emitting surface; a light homogenizing plate located above the light guide plate to make the active light emit uniformly; and a sensor for receiving the reflection signal of the palm. The utility model discloses a lateral light source along the light guide plate irradiation, and through the light homogenizing plate, the emitted light is uniform light, so that the light path is more uniform, and the cost is low, the controller device is few, and it is favorable to large-scale application.

Description

Technical Field

[0001] This utility model relates to the field of palm recognition technology, specifically to a palm brush module with side supplementary lighting. Background Technology

[0002] The supplementary lighting design of the palm-scanning module is a crucial aspect of palm-scanning devices, as it directly affects the quality of palm image acquisition and recognition accuracy during palm scanning.

[0003] The fill light for the palm-scanning module is mainly achieved through a fill light. The fill light and the camera are usually facing the same side to ensure that the light can be evenly illuminating the palm. The light emitted by the fill light is reflected by the palm and captured by the camera, thus forming a clear image of the palm.

[0004] There are generally two types of supplementary lighting: static supplementary lighting and dynamic supplementary lighting.

[0005] Static supplementary lighting: The supplementary light illuminates the palm at a fixed brightness and angle, suitable for palm recognition in most normal environments.

[0006] Dynamic lighting: With technological advancements, some advanced palm-swiping devices have adopted dynamic lighting technology. This technology uses a controller to monitor the distance between the palm and the device in real time, and adjusts the brightness and angle of the lighting accordingly to achieve a more precise lighting effect.

[0007] Static supplemental lighting provides weak information under certain conditions, resulting in poor recognition performance. Dynamic supplemental lighting, on the other hand, requires real-time adjustment of the brightness and angle of the supplemental lights, which is more costly.

[0008] 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

[0009] Therefore, this invention uses a side light source to illuminate the light guide plate and a light homogenizing plate to make the emitted light uniform, resulting in a more uniform light path, lower cost, fewer control devices, and is conducive to large-scale application.

[0010] This utility model provides a palm brush module with side supplemental lighting, characterized in that it includes:

[0011] The housing includes a light-emitting surface;

[0012] A side light source, located inside the housing, emits active light in a direction parallel to the light-emitting surface;

[0013] A light guide plate is used to receive the active light and emit it from the side through the light-emitting surface;

[0014] A light-diffusing plate is located above the light guide plate to ensure that the active light is emitted uniformly.

[0015] A sensor used to receive reflected signals from the palm.

[0016] Optionally, the brush module with side supplementary lighting is characterized in that there are multiple side light sources and light guide plates, and the side light sources are located at the edge, one end of the light guide plate is connected to the side light source, and the other end is located in the center.

[0017] Optionally, the brush module with side supplementary lighting is characterized in that the light guide plate has a reflective part at one end in the center for reflecting the remaining light to the light uniform plate.

[0018] Optionally, the brush palm module with side-filled lighting is characterized in that the light guide plate comprises:

[0019] A light guide section is provided for transmitting the active light, and an emission section is provided above it for emitting the active light;

[0020] A reflective film is located below the light guide and is tightly connected to the light guide to reflect the active light.

[0021] Optionally, the brush module with side-supplementary lighting is characterized in that the light-diffusing plate has a light-transmitting hole in the center so that the sensor can receive light signals.

[0022] Optionally, the brush module with side-illuminated light is characterized in that a light-blocking layer is provided on the side of the light-transmitting hole to prevent light from shining from the light-diffusing plate onto the sensor.

[0023] Optionally, the brush module with side-supplementary lighting is characterized in that a blocking component is provided above the sensor along the optical path direction to block stray light from entering the sensor.

[0024] Optionally, the brush module with side-filled lighting is characterized in that the included angle between adjacent light guide plates is negatively correlated with the light attenuation rate in the light guide plates.

[0025] Optionally, the brush module with side-filled lighting is characterized in that the haze is lower in the portion of the light-diffusing plate closer to the center.

[0026] Optionally, the brush module with side supplemental lighting is characterized in that the shell includes a first step and a second step; the first step is fixedly connected to a transparent cover plate, and the second step is fixedly connected to the light-diffusing plate; the first step is higher than the second step, and the first step is farther from the center of the light-diffusing plate than the second step.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The side-emitting light source of this invention illuminates a light-diffusing plate from multiple points via a light guide plate. After being modulated by the light-diffusing plate, the light path is more uniform and the light is softer, which is conducive to obtaining better quality palm images. At the same time, the side-emitting light source reduces the amount of light source data, lowers the control complexity and cost, and provides a more effective illumination range for palm-swiping applications. 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 brush palm module with side supplementary lighting in an embodiment of this utility model;

[0031] Figure 2 This is a schematic diagram of an optical path in an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the structure of a light-transmitting hole in an embodiment of this utility model;

[0033] Figure 4 This is a schematic diagram of the structure of a transparent cover plate in an embodiment of this utility model.

[0034] 1-Shell;

[0035] 2-Side light source;

[0036] 3-Light guide plate;

[0037] 4-Light homogenizer;

[0038] 5-Sensors;

[0039] 6-Reflective part;

[0040] 7-Light guide section;

[0041] 8-Reflective film;

[0042] 9-Light transmission hole;

[0043] 10 - Light-blocking layer;

[0044] 11-Barrier components;

[0045] 12- Transparent cover;

[0046] 13 - First step;

[0047] 14 - Second step; Detailed Implementation

[0048] 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.

[0049] 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.

[0050] This utility model provides a brush palm module with side supplementary lighting, which aims to solve the problems existing in the prior art.

[0051] 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.

[0052] This invention uses a side light source to illuminate the light guide plate and a light homogenizing plate to make the emitted light uniform, resulting in a more uniform light path. It is also low in cost and requires fewer control devices, which is beneficial for large-scale applications.

[0053] Figure 1 This is a schematic diagram of a brush palm module with side supplementary lighting according to an embodiment of this utility model. Figure 1 As shown, an embodiment of the present invention includes a palm brush module with side-illumination:

[0054] Housing 1 includes a light-emitting surface.

[0055] Specifically, housing 1 is used to house and protect internal components such as side light sources, light guide plates, light doubling plates, and sensors. The housing can be of various shapes, such as cuboids or cylinders. One surface of the housing has an opening, which is the light-emitting surface, allowing light to pass through and capture palm images. The housing 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.

[0056] The side light source 2 is located inside the housing and emits active light in a direction parallel to the light-emitting surface.

[0057] Specifically, the side light source 2 can be an infrared light source, visible light, or other types of light source, used to provide sufficient light to illuminate the image of the palm. The side light source typically includes components such as a light source and lenses, capable of producing pre-designed light. Active light is collimated light, making the light transmission within the light guide plate controllable. The number of side light sources can be one, two, three, or more. When there are two or more side light sources, the types of side light sources can be different; for example, one can be an infrared side light source, and another a visible light side light source.

[0058] The light guide plate 3 is used to receive the active light and emit it from the side through the light-emitting surface.

[0059] Specifically, the light guide plate is used to receive active light emitted from a side-mounted light source and, through its internal structural design (such as light guide points and microstructures), uniformly guides the light to the light-emitting surface. The light guide plate utilizes the principle of total internal reflection to guide light from one side to the other, and its microstructure design ensures uniform light distribution on the light-emitting surface. The light guide plate improves light utilization efficiency, allowing light to be fully utilized within the module and reducing light loss.

[0060] A light-diffusing plate 4 is located above the light guide plate to ensure that the active light is emitted uniformly.

[0061] Specifically, the light homogenizing plate, located above the light guide plate, is responsible for further homogenizing the light emitted from the light guide plate, ensuring that the light emitted from the light-emitting surface is uniform and spotless. The light passing through the light homogenizing plate will be evenly emitted to the palm, ensuring that the sensor can receive a uniform and consistent reflected light signal, which is crucial for improving the accuracy of biometric recognition. Figure 1 The location of the light-diffusing plate is not marked in the image; please refer to [reference needed]. Figure 2 .

[0062] Sensor 5, located below the light-diffusing plate, is used to receive reflected signals from the palm.

[0063] Specifically, the sensor can be an infrared sensor or other types of optical sensors used to capture reflected light from the palm and convert it into a digital image. This is one of the core components of palm recognition technology. The sensor typically employs a high-sensitivity image sensor, such as CMOS or CCD. When sensor 3 is a visible light sensor, it can acquire the texture features of the palm surface; when sensor 3 is an infrared sensor, it can acquire the vascular features of the palm epidermis. Both the texture and vascular features of the palm can be used for liveness detection and identity authentication. The type and number of sensors need to match the side light source. When the side light source 2 is a visible light side light source, sensor 3 is a visible light sensor. When the side light source 2 is an infrared side light source, sensor 3 is an infrared sensor. When there are two or more side light sources 2 of different types, the number of sensors 3 is also two or more of different types. It should be noted that the number of side light sources 2 and the number of sensors 3 are not always the same.

[0064] In some embodiments, there are multiple side light sources and light guide plates, with the side light sources located at the edges. One end of the light guide plate is connected to the side light source, and the other end is located in the center. The side light sources are arranged at the edges of the housing so that they can emit light along the periphery of the module. The use of multiple side light sources ensures sufficient light input throughout the entire edge of the module, thus avoiding uneven light distribution. One end of the light guide plate is tightly connected to the side light source at the edge to ensure that light can smoothly enter the interior of the light guide plate. The other end is located in the center or near the center of the module, so that light can propagate inside the light guide plate and be evenly distributed across the entire light-emitting surface. The interior of the light guide plate is typically designed with complex microstructures or light guide points. These structures guide light to undergo total internal reflection and scattering within the light guide plate, thereby uniformly emitting light from the light-emitting surface. The use of multiple light guide plates can further refine the light distribution and ensure the uniformity of light across the entire light-emitting surface. Multiple light guide plates ensure a relatively uniform distribution of light on the light-emitting surface, and after being treated with a light-diffusing plate, the light emitted from the light-emitting surface becomes even more uniform.

[0065] In some embodiments, such as Figure 3As shown, the light guide plate has a reflective portion 6 at one central end for reflecting residual light to the light homogenizing plate. In the design of the light guide plate, the main function of adding a reflective portion at the central end is to reflect residual light that has not been fully utilized or has not yet reached the light-emitting surface during its propagation within the light guide plate, allowing it to be redirected and evenly distributed on the light homogenizing plate. This design further improves the light utilization rate and the uniformity of light at the light-emitting surface. It should be noted that to avoid excessive light intensity in the center due to reflection from multiple light guide plates, the reflective portion needs to adjust the reflection angle so that the reflected light is evenly distributed above the light homogenizing plate. The reflective portion is typically made of a high-reflectivity material, such as a mirror material or specially coated plastic / metal, to ensure that the light can be effectively reflected back into the light guide plate or guided to the light homogenizing plate. This embodiment allows potentially wasted residual light to be reused, thereby improving the overall light utilization rate of the module. Through the reflection of the reflector, the light that might have been concentrated in certain areas of the light guide plate is dispersed to a wider area, further enhancing the uniformity of light on the light-emitting surface.

[0066] In some embodiments, such as Figure 2 As shown, the light guide plate 3 includes:

[0067] The light guide 7 is used to transmit the active light, and an emission part is provided above it for emitting the active light.

[0068] Specifically, the light guide is the main body of the light guide plate, typically made of high-transmittance optical-grade materials such as acrylic or glass. This material effectively conducts light while minimizing light energy loss. The main function of the light guide is to receive active light from a side source and transmit it to the designated emission point through total internal reflection. The emission point designed above the light guide, such as with special microstructures or coatings, can control the light emission in specific areas, achieving precise control and optimized light distribution. It should be noted that in this embodiment, the processing of the emission point mainly involves scattering the light in a direction perpendicular to the light guide, thereby ensuring more uniform scattering of the light on the light-diffusing plate.

[0069] The reflective film 8 is located below the light guide and is tightly connected to the light guide, and is used to reflect the active light.

[0070] Specifically, the reflective film is located below the light guide and is tightly connected to it. This structural design ensures that the reflective film effectively reflects all light that is not directly emitted through the output section, thereby improving light utilization. The reflective film is typically a highly reflective material, such as aluminum or a silver-plated film, used to reflect active light. This design prevents light from leaking into unnecessary areas, enhancing the efficiency and brightness of the entire system. The reflective effect of the reflective film is crucial for maintaining the intensity of the light source and achieving uniform illumination.

[0071] In some embodiments, such as Figure 3 As shown, a light-diffusing plate has a central light-passing hole 9 to allow the sensor to receive light signals. The light-passing hole provides a direct path for light to pass from above to below the light-diffusing plate. When a palm is placed above the module, the light reflected from the palm passes through the light-passing hole to reach the sensor. The position of the light-passing hole corresponds to the receiving area of ​​the sensor to ensure that the sensor can accurately receive light from specific areas of the palm. The light-passing hole can be flush with or higher than the sensor. When the light-passing hole is flush with the sensor, the thickness of the palm-scanning module can be minimized. This design helps improve the accuracy and stability of recognition. When a palm is placed above the module, the palm reflects light from the light-diffusing plate. These reflected rays pass through the light-passing hole and reach the sensor. The sensor receives and analyzes these light signals to identify palm feature information (such as palm prints, blood vessel distribution, etc.).

[0072] In some embodiments, such as Figure 3 As shown, a light-blocking layer 10 is provided on the side of the light-transmitting aperture to prevent light from shining from the light-diffusing plate onto the sensor. The setting of the light-transmitting aperture and the use of the light-blocking layer are key factors in ensuring light transmission efficiency and preventing light crosstalk. The light-blocking layer is mainly used to prevent light crosstalk between different optical areas, ensuring that light propagates along the expected path. The light-blocking layer is usually made of materials with high absorbency or high reflectivity, such as black light-absorbing materials or metal reflective films. These materials can effectively absorb or reflect light, preventing it from penetrating to the sensor. The structural design of the light-blocking layer needs to consider its fit with the light-transmitting aperture and the optical performance of the entire module. It should fit tightly against the side of the light-transmitting aperture without affecting the normal transmission of light or the sensor's receiving angle. Located on the side of the light-transmitting aperture, the light-blocking layer acts like a barrier, blocking light from other areas of the light-diffusing plate, ensuring the purity and accuracy of the optical signal, and enhancing the recognition effect.

[0073] In some embodiments, such as Figure 3As shown, a blocking component 11 is disposed above the sensor along the optical path direction to block stray light from entering the sensor. The blocking component is made of opaque material and is used to block light from below the light-diffusing plate from entering the sensor. One end of the blocking component is connected to the sensor, and the other end is connected to the light-diffusing plate, thereby blocking light reflected from the light-diffusing plate and light emitted from the light guide plate from entering the sensor.

[0074] In some embodiments, the angle between adjacent light guide plates is negatively correlated with the light attenuation rate within the light guide plate. The light guide plate is elongated. When multiple light guide plates are present, they are located on the same plane, with an angle between adjacent light guide plates. Different light guide plate designs result in different light attenuation rates. The faster the light attenuation rate of a light guide plate, the weaker the light intensity emitted from the central end of the light guide plate, leading to a lower light intensity in the center of the light homogenizer. Therefore, the greater the light attenuation rate of a light guide plate, the more light guide plates are needed to maintain a strong light intensity in the center; in this case, the angle between adjacent light guide plates is smaller.

[0075] In some embodiments, the haze is lower closer to the center of the light-diffusing plate. Haze is an indicator of a material's ability to scatter light; it reflects the degree to which light is scattered within or on the surface of the material. In a light-diffusing plate, appropriate haze helps to homogenize light, creating a soft and uniform illumination effect on the plate surface. However, excessive haze can also lead to overly scattered light, affecting light transmission efficiency and recognition accuracy. Because the light-diffusing plates are arranged around the center, for the same area, there are more light-diffusing plates in the center than at the edges, resulting in a more uniform light distribution, but at the same time, the brightness of each light-diffusing plate is lower. This embodiment designs the portion of the light-diffusing plate closer to the center to have lower haze while also having higher transmittance. This helps to reduce light scattering in this area, resulting in higher intensity light emitted through the light-diffusing plate. In contrast, the edge portions of the light-diffusing plate are designed with higher haze. This is to utilize the scattering effect to evenly distribute light from the light source (such as an LED) across the entire plate surface. By increasing the haze in the edge areas, the light can gradually diffuse during transmission, creating a uniform illumination effect. This embodiment helps to achieve uniform light distribution across the entire light-diffusing plate, ensuring consistent lighting conditions regardless of where the hand is placed on the module.

[0076] In some embodiments, such as Figure 4As shown, the housing includes a first step 13 and a second step 14; the first step is fixedly connected to the transparent cover plate 12, and the second step is fixedly connected to the light-diffusing plate; the first step is higher than the second step, and the first step is farther from the center of the light-diffusing plate than the second step. The transparent cover plate can prevent physical damage and scratches. The transparent cover plate needs to have good light transmittance to ensure that light can pass through smoothly and illuminate the palm surface. Figure 4 As shown, the first step is located at the top of the housing and is fixedly connected to the transparent cover plate. Since the first step is higher than the second step and farther from the center of the light-diffusing plate, it primarily provides a stable support platform for the transparent cover plate. This design helps ensure a certain distance between the transparent cover plate and the light-diffusing plate, preventing abrasion or pressure that might occur from direct contact from being transmitted to the light-diffusing plate. The second step is located below the first step and is fixedly connected to the light-diffusing plate. The second step directly supports the light-diffusing plate, ensuring its stability and positional accuracy. Because the second step is closer to the center of the light-diffusing plate than the first step, it can more effectively transmit light from the array's side light sources, reducing light loss and scattering during transmission. The first step's greater distance from the center of the light-diffusing plate compared to the second step helps to better control light propagation. For example, in applications where it is necessary to avoid direct central light shining onto the transparent cover plate causing reflections or glare, this design can effectively guide light to scatter in all directions, thereby reducing unwanted light effects.

[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 palm brush module with side-illumination, characterized in that, include: The housing includes a light-emitting surface; A side light source, located inside the housing, emits active light in a direction parallel to the light-emitting surface; A light guide plate is used to receive the active light and emit it from the side through the light-emitting surface; A light-diffusing plate is located above the light guide plate to ensure that the active light is emitted uniformly. A sensor used to receive reflected signals from the palm.

2. A brush palm module with side supplementary lighting according to claim 1, characterized in that, There are multiple side light sources and light guide plates, with the side light sources located at the edges, and one end of the light guide plate connected to the side light source and the other end located in the center.

3. A brush palm module with side supplementary lighting according to claim 2, characterized in that, The light guide plate has a reflective part at one of its central ends, which is used to reflect the remaining light to the light uniform plate.

4. A palm brush module with side-illumination according to claim 1, characterized in that, The light guide plate includes: A light guide section is provided for transmitting the active light, and an emission section is provided above it for emitting the active light; A reflective film is located below the light guide and is tightly connected to the light guide to reflect the active light.

5. A palm brush module with side-illumination according to claim 1, characterized in that, The light-diffusing plate has a light-transmitting hole in the center so that the sensor can receive light signals.

6. A palm brush module with side-illumination according to claim 5, characterized in that, A light-blocking layer is provided on the side of the light-transmitting hole to prevent light from shining from the light-diffusing plate onto the sensor.

7. A palm brush module with side-illumination according to claim 5, characterized in that, A blocking component is provided above the sensor along the optical path to block stray light from entering the sensor.

8. A brush palm module with side supplementary lighting according to claim 2, characterized in that, The included angle between adjacent light guide plates is negatively correlated with the light attenuation rate in the light guide plate.

9. A palm brush module with side-illumination according to claim 2, characterized in that, The closer the light-diffusing plate is to the center, the lower the haze.

10. A brush palm module with side-illumination according to claim 1, characterized in that, The housing includes a first step and a second step; the first step is fixedly connected to a transparent cover plate, and the second step is fixedly connected to the light-diffusing plate; the first step is higher than the second step, and the first step is farther from the center of the light-diffusing plate than the second step.

Images