Face recognition terminal and access control device

Abstract

The utility model discloses a kind of face recognition terminal and access control device, it belongs to face recognition technical field, terminal includes shell, flexible light source structure and adjusting assembly.The shell has opposite first side and second side;Flexible light source structure is set to shell, and light-emitting side is towards first side;Adjusting assembly includes support seat fixed in shell, traction mechanism and drive mechanism, guide slot is opened on support seat, traction mechanism is slidably connected in guide slot and its pull end is rotatably connected in flexible light source structure, drive mechanism moves along guide slot to change the pull position of pull end to flexible light source structure to the traction of flexible light source structure occurs bending deformation and changes light-emitting direction.Access control device is configured with above-mentioned terminal, the utility model adjusts the light supplementing angle by adjusting the bending degree of flexible light source structure, can change light-emitting direction dynamically according to actual illumination and recognition effect, improve face recognition accuracy and pass rate.

Description

Technical Field

[0001] This utility model relates to the field of facial recognition technology, and in particular to a facial recognition terminal and access control device. Background Technology

[0002] Facial recognition access control, as an intelligent security device based on biometric authentication, has been widely deployed in various scenarios such as residential buildings, offices, parks, and public transportation hubs. In actual use, the lighting conditions of the access control terminal vary, especially in low-light or no-light environments such as corridors, underground parking garages, and outdoor areas at night. The ambient illumination often fails to meet the basic requirements of facial recognition cameras for image clarity. Therefore, existing access control devices typically incorporate supplementary lighting on the terminal itself to actively provide auxiliary illumination when ambient light is insufficient, improving the brightness and contrast of facial images and thus ensuring the usability of the recognition system under various lighting conditions.

[0003] Currently, most facial recognition access control terminals in building corridors use fixed light source structures for their supplementary lighting. These structures are fixed to the front or side panels of the access control unit. During identity recognition, the light source projects light onto the face of the person being identified to increase ambient illumination, allowing the camera to capture a sufficiently bright facial image for subsequent feature extraction and identity comparison. The orientation of the emitting surface of these existing light source structures is predetermined at the factory and cannot be adaptively adjusted based on actual lighting conditions or recognition performance. While some products include supplementary lighting intensity adjustment functions—such as changing the power supply current or pulse width modulation duty cycle—the light projection direction remains constant, always illuminating the face of the person being identified at a fixed angle.

[0004] However, in practical applications, fixed-angle illumination can lead to problems. When the light source shines directly onto the face of the person being recognized, specular reflections easily occur on relatively flat and highly reflective areas such as the forehead, bridge of the nose, and cheekbones. The reflected light then concentrates in a specific direction. If this reflection is directly aligned with the facial recognition camera, localized overexposure or bright spots will appear in the captured facial image. These bright areas not only obscure facial texture and contour details but also interfere with the recognition algorithm's ability to locate and extract key feature points, thus reducing the accuracy and success rate of facial recognition. While adjusting the brightness of the illumination can reduce reflectivity to some extent, simply reducing brightness may result in the loss of details in darker areas of the face, making it difficult to strike a balance between suppressing reflections and maintaining overall brightness. Utility Model Content

[0005] The purpose of this utility model is to provide a face recognition terminal and access control device to solve the technical problem in the prior art where the light source device has a fixed light output direction, which causes local bright reflections in the face image and affects the recognition accuracy.

[0006] To achieve this objective, the present invention adopts the following technical solution: On the one hand, this utility model provides a face recognition terminal, which includes: The housing has a first side and a second side that are disposed opposite to each other; A flexible light source structure is disposed in the housing, the flexible light source structure having a light-emitting side facing the first side; The adjustment assembly includes a support base, a traction mechanism, and a drive mechanism. The support base is fixedly disposed within the housing and has a guide groove extending from the first side to the second side. The traction mechanism is slidably connected to the guide groove and has at least one pulling end. The pulling end is rotatably connected to the flexible light source structure. The drive mechanism can drive the traction mechanism to move along the guide groove to change the pulling position of the pulling end on the flexible light source structure, causing the flexible light source structure to bend and deform, thereby changing the light emission direction.

[0007] Preferably, the traction mechanism includes a first traction arm and a second traction arm. The first traction arm and the second traction arm are arranged at an angle and fixedly connected to each other. A sliding rod is provided at the connection between the first traction arm and the second traction arm. The sliding rod is slidably engaged in the guide groove. The ends of the first traction arm and the second traction arm respectively form a pulling end. Each pulling end is connected to a different position of the flexible light source structure.

[0008] Preferably, the support base is disposed in the middle of the housing, and the flexible light source structure includes a first end near the middle of the housing and a second end away from the middle of the housing; The pulling end of the first traction arm is connected to the flexible light source structure at the middle position between the first end and the second end; The pulling end of the second traction arm is connected to the flexible light source structure near the first end; The length of the first traction arm is greater than the length of the second traction arm.

[0009] Preferably, there are two flexible light source structures, which are symmetrically arranged on both sides of the support base. Each flexible light source structure is provided with a corresponding traction mechanism, and the two traction mechanisms are slidably connected to the same support base.

[0010] Preferably, the support base is provided with two guide grooves symmetrically, and the two guide grooves are respectively provided for two traction mechanisms. Each traction mechanism is slidably connected to the guide groove on the corresponding side, and the two guide grooves extend at an angle that gradually moves away from each other in the direction from the first side to the second side.

[0011] Preferably, the flexible light source structure includes a flexible substrate and a plurality of light-emitting units disposed on the flexible substrate. The flexible substrate has a light-emitting side facing a first side of the housing, and the plurality of light-emitting units are distributed on the light-emitting side. A supplementary light window is provided through the first side of the housing. The flexible light source structure is housed in the housing, and the light-emitting units project light to the outside of the housing through the supplementary light window.

[0012] Preferably, the drive mechanism includes a telescopic drive component and a traction rope. The telescopic drive component is disposed inside the housing. One end of the traction rope is connected to the telescopic end of the telescopic drive component, and the other end of the traction rope is connected to the traction mechanism. The telescopic drive component can drive the traction mechanism to slide along the guide groove through the traction rope.

[0013] Preferably, the telescopic drive component is positioned at an angle to the extension direction of the guide groove.

[0014] Preferably, the support base includes an upper support plate and a lower support plate arranged opposite to each other, the upper support plate and the lower support plate are fixedly connected by a support column, the upper support plate and the lower support plate are respectively provided with guide grooves, the traction mechanism is arranged between the upper support plate and the lower support plate, and is slidably engaged in the corresponding guide grooves.

[0015] On the other hand, this utility model also provides an access control device, which includes: Access control unit; The aforementioned face recognition terminal has its housing connected to the access control body; A face recognition module is installed on the access control body and located on the first side of the housing, and is used to collect and recognize face images; The light-emitting side of the flexible light source structure faces the recognition area of ​​the face recognition module, and the face recognition module is communicatively connected to both the flexible light source structure and the driving mechanism. The face recognition module is configured to send a light emission control signal to the flexible light source structure to control the opening and closing of the flexible light source structure and the light emission intensity. The face recognition module can also send a position control signal to the driving mechanism to control the driving mechanism to move the traction mechanism, thereby changing the light emission direction of the flexible light source structure.

[0016] The beneficial effects of this utility model are: The facial recognition terminal proposed in this utility model features a support base with a guide groove fixed inside the housing. A traction mechanism is slidably connected to the guide groove, and the pulling end of the traction mechanism is rotatably connected to a flexible light source structure. As the driving mechanism moves the traction mechanism along the guide groove from the first side to the second side of the housing, the position of the pulling end continuously changes. Because the pulling end is rotatably connected to the flexible light source structure, this rotatable connection allows the pulling end to apply a pulling force to the flexible light source structure while sliding along the guide groove, and also to adapt to the angular deflection caused by the bending of the flexible light source structure. This avoids damage to the light source structure or stress concentration caused by rigid constraints, thus ensuring that the flexible light source structure can undergo smooth and controllable bending deformation under asymmetrical pulling forces. As the bending shape of the flexible light source structure changes, the orientation of its light-emitting side also continuously changes, thereby changing the light emission direction and allowing the spatial projection angle of the emitted light to be adjusted as needed. In practical use, when localized bright reflections appear in the facial image captured by the face recognition camera, the drive mechanism moves the traction mechanism an appropriate distance along the guide groove. The flexible light source structure, driven by the traction end, bends to the corresponding curvature, causing the main light emission direction to avoid the specular reflection direction of the highly reflective areas of the face. This effectively reduces the possibility of concentrated reflected light along the optical path of the face recognition camera, mitigating localized overexposure. Simultaneously, because the light emission direction changes rather than simply reducing the luminous intensity, the entire facial area still receives sufficient incident light flux, and the texture details in low-recessed areas of the face are not lost due to insufficient lighting. Ultimately, this ensures uniform brightness across the entire face. Under the premise of minimizing the interference of high-brightness light spots on feature point localization, the facial recognition algorithm improves the feature extraction accuracy and identity comparison pass rate under complex lighting conditions. Furthermore, since the guide groove extends from the first side to the second side, the travel range of the traction mechanism within the guide groove determines the continuous adjustment range of the flexible light source structure's bending deformation. The drive mechanism can control the stopping position of the pulling end in the guide groove according to the actual facial position of the person to be identified at different heights and standing distances, so that the light output direction matches the optimal supplementary lighting angle for the current identification object, thereby adaptively covering the differentiated supplementary lighting needs under different usage scenarios, further expanding the applicability and accuracy of this facial recognition terminal. In addition, the adjustment component is entirely built into the housing, and the flexible light source structure is directly set on the housing, eliminating the need for additional moving parts or adjustment mechanisms on the outside of the terminal. The overall appearance of the terminal is simple and compact, while avoiding the reliability degradation problem caused by dust intrusion or mechanical collisions to exposed moving parts, ensuring the stability and durability of the supplementary lighting direction adjustment function during long-term use. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the overall structure of the face recognition terminal provided in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of a portion of the structure of the face recognition terminal provided in Embodiment 1 of this utility model; Figure 3 This is another structural schematic diagram of the face recognition terminal provided in Embodiment 1 of this utility model; Figure 4 This is a schematic diagram of another part of the structure of the face recognition terminal provided in Embodiment 1 of this utility model; Figure 5 This is a schematic diagram of the structure of the adjustment component provided in Embodiment 1 of this utility model.

[0018] In the picture: 1. Housing; 10. Receiving cavity; 11. First side; 12. Second side; 13. Fill light window; 2. Flexible light source structure; 2a. Light-emitting side; 21. First end; 22. Second end; 23. Connecting ear plate; 3. Adjustment assembly; 31. Support base; 310. Guide groove; 311. Upper support plate; 312. Lower support plate; 313. Support column; 32. Traction mechanism; 32a. Pulling end; 321. First traction arm; 322. Second traction arm; 323. Slide rod; 324. Rotating shaft; 33. Drive mechanism; 331. Telescopic drive component; 332. Traction rope. Detailed Implementation

[0019] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar parts or parts having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0020] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0021] In the description of this utility model, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0022] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1 See Figures 1 to 5 The face recognition terminal provided in this embodiment of the present invention includes a housing 1, a flexible light source structure 2, and an adjustment component 3. The housing 1 has a first side 11 and a second side 12 disposed opposite to each other. The flexible light source structure 2 is disposed on the housing 1 and has a light-emitting side 2a facing the first side 11. The adjustment component 3 includes a support base 31, a traction mechanism 32, and a drive mechanism 33. The support base 31 is fixedly disposed within the housing 1 and has a guide groove 310 extending from the first side 11 to the second side 12. The traction mechanism 32 is slidably connected to the guide groove 310 and has at least one pulling end 32a, which is rotatably connected to the flexible light source structure 2. The drive mechanism 33 can drive the traction mechanism 32 to move along the guide groove 310 to change the pulling position of the pulling end 32a on the flexible light source structure 2, causing the flexible light source structure 2 to bend and deform, thereby changing the light emission direction.

[0024] The housing 1 serves as the basic load-bearing structure of the terminal, providing mounting support and protection for the flexible light source structure 2, the adjustment component 3, and components such as the camera and control circuit board required for face recognition. The housing 1 has a first side 11 and a second side 12 that are arranged opposite to each other.

[0025] It should be noted that in this invention, the first side 11 of the housing 1 is defined as the face recognition side, that is, the side that the person to be identified faces when verifying their identity, and the side opposite to the first side 11 is defined as the second side 12. Taking the application scenario where the face recognition terminal is installed inside or on the surface of a wall as an example, when the person to be identified stands in front of the terminal for face recognition, the side where the person is located corresponds to the first side 11, while the side inside the wall or away from the person corresponds to the second side 12. This definition makes it easy to clearly distinguish between the working side of the terminal facing the user and the side away from the user, thus providing a clear reference for the subsequent description of the layout and positional relationship of each component.

[0026] The specific structural form of housing 1 can be adapted to the actual application scenario and installation requirements. In some embodiments, housing 1 adopts a split structure, such as including a detachably connected front shell and a rear shell. The front shell forms at least a part of the first side 11, and the rear shell forms at least a part of the second side 12. The front shell and the rear shell are detachably fixed by threaded connectors, snap-fit ​​structures, or a combination of both. This arrangement facilitates the assembly, maintenance, and repair of the various components inside housing 1. In other embodiments, housing 1 adopts a one-piece molded structure, such as by injection molding or die casting. The one-piece molded housing 1 has high structural strength and good overall sealing performance, which can effectively prevent external dust, moisture, etc. from entering the interior through the gaps in the housing 1, thereby ensuring the operational reliability and service life of the electronic components inside the terminal.

[0027] In some embodiments, the housing 1 can be directly embedded inside the wall. In this case, most of the area of ​​the second side 12 of the housing 1 is covered by the wall, with only the first side 11 exposed to the outside for facial recognition. This embedded installation method allows the terminal to be flush or nearly flush with the wall surface, resulting in a neat appearance and not occupying additional passage space. In other embodiments, the housing 1 can also be fixedly installed on the wall surface using a wall-mounted bracket. In this case, the housing 1 protrudes entirely from the wall surface, with the second side 12 facing the wall and the first side 11 facing away from the wall and towards the person to be recognized. In still other embodiments, the housing 1 can also be integrated into other carriers such as doors, turnstiles, and columns, which will not be listed here.

[0028] The housing 1 has an internal cavity 10 for accommodating the flexible light source structure 2, the adjustment assembly 3, and the control circuit board, among other internal components. The volume and shape of the cavity 10 can be adapted to fit the size and layout of the internal components.

[0029] A flexible light source structure 2 is disposed on the housing 1 and is used to actively provide auxiliary illumination to the facial area of ​​the person to be identified when the ambient light is insufficient. The flexible light source structure 2 has a light-emitting side 2a facing the first side 11 of the housing 1, that is, the side facing the person to be identified, to ensure that the emitted light can be projected onto the external facial area through the first side 11 of the housing 1. The flexible light source structure 2 can elastically bend and deform when subjected to asymmetrical external forces, thereby changing the spatial orientation of the light-emitting side 2a and continuously adjusting the projection direction of the emitted light.

[0030] As a specific implementation, the flexible light source structure 2 includes a flexible substrate and multiple light-emitting units disposed on the flexible substrate. The flexible substrate serves as a supporting foundation, providing electrical connections and mechanical support for each light-emitting unit. The flexible substrate can take the form of a flexible circuit board, flexible circuit board, or flexible lamp board, possessing inherent bendable and flexible characteristics. For example, the flexible substrate can use a polyimide film as a substrate, on which conductive lines are formed through etching or printing processes. Each light-emitting unit is then soldered or mounted onto predetermined pads on the conductive lines, thereby forming a bendable, light-emitting strip structure. Due to the excellent bending performance of the flexible substrate, when external tensile force is applied to a specific part of the flexible substrate, the substrate can smoothly bend and deform in accordance with the direction of the force without causing permanent structural damage or internal circuit breakage. Furthermore, the flexible substrate can extend in a long strip shape, for example, along the length or width direction of the housing 1, so that it can achieve a more significant change in light emission direction when bending.

[0031] Multiple light-emitting units are distributed on the light-emitting side 2a of the flexible substrate, which is the surface of the flexible substrate facing the first side 11 of the housing 1. The light-emitting units can be light-emitting diode chips or surface-mount light-emitting diodes. These light-emitting units have advantages such as small size, high brightness, fast response speed, and low power consumption, making them suitable for integration into devices such as access control terminals that have requirements for power consumption and size.

[0032] The light-emitting units are arranged at intervals along the extension direction of the flexible substrate. The spacing between adjacent light-emitting units can be set according to the requirements of uniform illumination. If the spacing is too large, it may cause alternating bright and dark stripes in the illumination area. If the spacing is too small, it may increase unnecessary power consumption and cost. Preferably, the light-emitting units are arranged at equal intervals along the extension direction of the flexible substrate so that the light-emitting side 2a forms a surface light source with uniform illumination in the length direction, avoiding the occurrence of local areas that are too bright or too dark.

[0033] It is understandable that the light-emitting units can also be arranged in a non-equidistant manner according to actual light distribution requirements. For example, they can be densely arranged in the central region of the light-emitting side 2a and sparsely arranged in the edge region to adapt to the illumination distribution requirements in different scenarios. The specific type, number and arrangement of the light-emitting units are not limited here, and those skilled in the art can flexibly set them according to actual supplementary lighting needs.

[0034] Specifically, a supplementary lighting window 13 is provided through the first side 11 of the housing 1, penetrating the wall panel of the first side 11, thus connecting the interior of the housing 1 with the external space. A flexible light source structure 2 is housed within the receiving cavity 10 of the housing 1 and located on the first side 11, with the light-emitting side 2a of the flexible light source structure 2 corresponding to the supplementary lighting window 13. The light emitted by the light-emitting unit is projected onto the outside of the housing 1 through the supplementary lighting window 13, ultimately illuminating the facial area of ​​the person to be identified.

[0035] The shape and size of the supplementary lighting window 13 should match the shape and size of the flexible light source structure 2. For example, when the flexible light source structure 2 adopts a long strip of flexible light, the supplementary lighting window 13 is correspondingly set as a long strip-shaped through slot. The length of the supplementary lighting window 13 is not less than the effective light-emitting length of the flexible light source structure 2, and its width is not less than the width of the flexible substrate, so as to ensure that the light emitted by all light-emitting units can pass through the supplementary lighting window 13 without obstruction.

[0036] To ensure that the flexible light source structure 2 is not interfered with by the housing 1 when it is bent and deformed, the width of the supplementary light window 13 should be reserved with an appropriate margin so that the light-emitting side 2a of the flexible light source structure 2 can still be kept within the width range of the supplementary light window 13 when it is bent, so as to avoid the edge of the flexible substrate after bending from colliding or rubbing against the sidewall of the supplementary light window 13.

[0037] Meanwhile, a flexible light-transmitting protective film can also be installed inside the supplementary lighting window 13. The light-transmitting protective film covers the supplementary lighting window 13 and separates the inner and outer spaces of the housing 1, allowing light to pass through while preventing external dust, moisture, etc. from entering the interior of the housing 1 through the supplementary lighting window 13.

[0038] The light-transmitting protective film can be made of materials such as transparent silicone film or transparent polyurethane film, which has a certain elastic deformation capability and will not cause additional obstacles to the bending deformation of the flexible light source structure 2.

[0039] Optionally, a camera window may also be provided on the first side 11 of the housing 1 for the face recognition camera to capture external facial images. In the actual layout, the supplementary lighting window 13 can be set around the camera window, for example, above, below, to the left or right of the camera window, to ensure that the supplementary lighting can fully illuminate the facial area of ​​the person to be recognized.

[0040] The support base 31 serves as the fixed foundation for the adjustment component 3, providing sliding guide support for the traction mechanism 32. The support base 31 is fixedly installed inside the housing 1 and fixedly positioned on the second side 12 of the housing 1. The specific fixing position of the support base 31 can be reasonably selected based on the internal spatial layout of the housing 1 and the placement position of the flexible light source structure 2. The support base 31 can be a one-piece molded structure, for example, directly formed on the inner wall surface of the housing 1 through injection molding or die casting, or it can be a split structure that is detachably fixed to the inner wall or internal support of the housing 1.

[0041] A guide groove 310 is provided on the support base 31, extending from the first side 11 to the second side 12 of the housing 1. The guide groove 310 can be a through groove extending through the thickness direction of the support base 31, or a recessed groove formed on the surface of the support base 31, as long as it can provide sliding guidance for the traction mechanism 32. The cross-sectional shape of the guide groove 310 should be adapted to the shape of the corresponding sliding engagement part on the traction mechanism 32. For example, the guide groove 310 can adopt a rectangular groove, a T-shaped groove, or a dovetail groove cross-section to prevent the traction mechanism 32 from dislodging from the guide groove 310 during sliding.

[0042] Furthermore, the support base 31 includes an upper support plate 311 and a lower support plate 312 disposed opposite to each other, and the upper support plate 311 and the lower support plate 312 are fixedly connected by a support column 313. The upper support plate 311 and the lower support plate 312 are located above and below the traction mechanism 32, respectively, with a predetermined distance between them. This predetermined distance should not be less than the dimension of the traction mechanism 32 in the height direction to ensure that the traction mechanism 32 can be smoothly accommodated in the space between the upper support plate 311 and the lower support plate 312. The support column 313 is disposed in the edge area between the upper support plate 311 and the lower support plate 312, and the two are fixedly connected as one unit by means of connectors or welding. The upper support plate 311 and the lower support plate 312 are respectively provided with guide grooves 310, that is, the guide grooves 310 on the upper support plate 311 and the guide grooves 310 on the lower support plate 312 are opposite in position and have the same shape. The traction mechanism 32 is disposed between the upper support plate 311 and the lower support plate 312, and is slidably fitted in the corresponding guide grooves 310.

[0043] As a specific implementation, the traction mechanism 32 includes a first traction arm 321 and a second traction arm 322. The first traction arm 321 and the second traction arm 322 are arranged at an angle and fixedly connected to each other. A slide rod 323 is provided at the connection between the first traction arm 321 and the second traction arm 322. The slide rod 323 is slidably fitted into a guide groove 310 on the support base 31. The slide rod 323 is at least partially accommodated in the guide groove 310 and can slide freely within the guide groove 310, thereby allowing the entire traction mechanism 32 to move along the extension direction of the guide groove 310.

[0044] In this embodiment, the upper end of the slide rod 323 at the connection of the traction mechanism 32 is slidably engaged in the guide groove 310 of the upper support plate 311, and the lower end of the slide rod 323 is slidably engaged in the guide groove 310 of the lower support plate 312. By simultaneously constraining both ends of the slide rod 323 through the upper and lower guide grooves 310, the slide rod 323 slides more smoothly and steadily within the guide grooves 310, effectively preventing tilting or jamming of the slide rod 323 under force. This ensures that the traction mechanism 32 moves precisely along a predetermined path, ensuring that the flexible light source structure 2 receives stable and controllable traction. Furthermore, housing the traction mechanism 32 between the upper support plate 311 and the lower support plate 312 also provides a certain degree of limitation and protection for the movement of the traction mechanism 32, preventing interference between the traction mechanism 32 and other internal components during sliding.

[0045] Specifically, the first traction arm 321 and the second traction arm 322 each form a traction end 32a at their ends away from the connection point, and each traction end 32a is connected to a different position of the flexible light source structure 2. When the drive mechanism 33 drives the traction mechanism 32 to move, the slide bar 323 slides in the guide groove 310, and the entire traction mechanism 32 moves along the path of the guide groove 310 with the slide bar 323. By using the same traction mechanism 32, traction force can be applied to two different parts of the flexible light source structure 2 at the same time, so that the flexible light source structure 2 is subjected to more balanced force when bending, avoiding the problem of excessive local bending or torsion deformation caused by single-point traction.

[0046] The specific structural form of the pulling end 32a can be adaptively designed according to the corresponding connection part on the flexible light source structure 2. In this embodiment, the flexible light source structure 2 is provided with a connecting ear plate 23, and the pulling end 32a is rotatably connected to the connecting ear plate 23 through a rotating shaft 324. Through the connection of the rotating shaft 324, the pulling end 32a and the flexible light source structure 2 form a rotating pair, so that the two can rotate relative to each other in a plane perpendicular to the axis of the rotating shaft 324. When the traction mechanism 32 slides along the guide groove 310 under the drive of the driving mechanism 33, the position of the pulling end 32a moves, applying a pulling force to the flexible light source structure 2. As the flexible light source structure 2 gradually bends and deforms, the tangential direction of the surface of its pulled part also changes continuously. During the bending process, the connection part of the flexible light source structure 2 can swing freely relative to the pulling end 32a, always maintaining a reasonable force angle with the pulling end 32a. The pulling end 32a transmits the pulling force only along its axial direction and does not apply additional torsional torque to the pulled part. Therefore, the flexible light source structure 2 can be smoothly bent into a curved surface with a predetermined arc under the action of the pulling force, and the force on each part is uniform and the deformation is continuous and controllable.

[0047] Furthermore, the support base 31 is located in the central region of the housing 1, making the space on both sides of the support base 31 relatively balanced. The flexible light source structure 2 includes a first end 21 near the center of the housing 1 and a second end 22 away from the center of the housing 1. With the support base 31 as the midpoint, the first end 21 of the flexible light source structure 2 is close to the support base 31, while the second end 22 extends towards the edge of the housing 1. In this arrangement, the pulling end 32a of the first traction arm 321 is connected to the middle position of the flexible light source structure 2 between the first end 21 and the second end 22, while the pulling end 32a of the second traction arm 322 is connected to the position of the flexible light source structure 2 near the first end 21. By having the two pulling ends 32a act on different parts of the flexible light source structure 2 respectively, and the length of the first traction arm 321 is greater than the length of the second traction arm 322, the two pulling ends 32a are spatially staggered. When the slide bar 323 moves along the guide groove 310, the pulling end 32a of the longer first traction arm 321 acts on the middle region of the flexible light source structure 2, while the pulling end 32a of the shorter second traction arm 322 acts on the region near the first end 21. Due to the difference in displacement between the two pulling ends 32a, the flexible light source structure 2 is subjected to different degrees of tension in different parts, thus forming a non-uniform bending shape. This non-uniform bending allows the light-emitting surface of the flexible light source structure 2 to exhibit a curved shape; for example, the curvature is larger near the middle of the housing 1 and smaller further away, thereby diversifying the distribution of emitted light in space and effectively preventing light from concentrating in a specific direction.

[0048] The first end 21 and the second end 22 of the flexible light source structure 2 along its length can be constrained to corresponding positions in the housing 1, for example, by pressing with a pressure plate or by engaging with a slot, while the middle region of the flexible light source structure 2 is in a freely bendable state. Taking the support base 31 located in the middle of the housing 1 and the first end 21 of the flexible light source structure 2 being close to the middle of the housing 1 and the second end 22 being far from the middle of the housing 1 as an example, the first end 21 can be constrained to a corresponding position in the middle of the housing 1, and the second end 22 is constrained to a corresponding position on the edge of the housing 1. When the pulling end 32a of the traction mechanism 32 acts on the middle region of the flexible light source structure 2, due to the fixed ends and the force applied in the middle, the middle region of the flexible light source structure 2 undergoes a bending displacement toward the second side 12 of the housing 1, thereby forming a curved shape.

[0049] Specifically, when the flexible light source structure 2 is in a flat state, the light-emitting side 2a is a plane or nearly a plane, and the emitted light from each light-emitting unit is emitted towards the outside of the housing 1 in roughly the same direction, that is, perpendicular to the light-emitting side 2a. The light forms a concentrated illumination area on the face of the person to be identified. When the slide bar 323 slides along the guide groove 310 from the first side 11 to the second side 12 of the housing 1 under the drive of the drive mechanism 33, the pulling ends 32a of the first traction arm 321 and the second traction arm 322 simultaneously pull the corresponding parts of the flexible light source structure 2 towards the second side 12 of the housing 1. Since the two ends of the flexible light source structure 2 are fixed and constrained, the flexible light source structure 2 bends and deforms under the pulling action. At this time, the flexible light source structure 2 bends into an arc shape, with its center facing the first side 11 of the housing 1, that is, the side facing the person to be identified. As the flexible light source structure 2 bends into an arc shape, the supplementary light that was originally concentrated in front is dispersed and projected in multiple directions. Compared to flat lighting, the curved structure transforms the light distribution from concentrated illumination to diffused illumination. Each light-emitting unit emits light at different angles, effectively reducing the intensity of light concentrated on the central area of ​​the face and minimizing glare caused by excessive local illumination. Simultaneously, the curved, flexible light source structure 2 enhances the lighting effect on the user's side profile, making facial contour information clearer and facilitating the acquisition of more lateral feature information by the facial recognition system.

[0050] To further improve the supplementary lighting effect and facial illumination uniformity, two flexible light source structures 2 can be provided. The two flexible light source structures 2 are symmetrically arranged on both sides of the support base 31, and each flexible light source structure 2 is equipped with a corresponding traction mechanism 32. The two traction mechanisms 32 are independently slidably connected to the same support base 31, and can control the bending degree of their respective flexible light source structures 2. When the two flexible light source structures 2 bend synchronously, supplementary lighting can be provided to the left and right sides of the face of the person to be identified, making the illumination intensity on both sides more balanced. Compared with a single-sided supplementary lighting structure, a dual-sided supplementary lighting structure can effectively reduce shadow areas, especially addressing the problem of excessive contrast between light and dark areas on both sides of the nose bridge and eye sockets that may be caused by single-sided illumination, thereby improving the overall brightness uniformity of the face. Furthermore, after the two flexible light source structures 2 form a symmetrical arc, they can create a cross-lighting effect on both sides of the face. That is, after the light emitted by the left flexible light source structure 2 reaches the face, part of it is reflected to the right side area, and the light from the right flexible light source structure 2 is similarly reflected to the left side area, so that the side face area can be more fully illuminated, thereby further improving the acquisition quality of facial contour features.

[0051] Of course, in actual use, the two traction mechanisms 32 can also be controlled independently. That is, according to the different light distribution on the left and right sides in the actual face image, the corresponding traction mechanism 32 is driven to move along the guide groove 310 by different distances, so that the two flexible light source structures 2 are bent into different curvatures, so that the left and right sides are illuminated at their respective optimal supplementary light angles, thereby achieving fine adjustment of the supplementary light direction.

[0052] Regarding the cooperation structure between the support base 31 and the traction mechanism 32, two guide grooves 310 are symmetrically arranged on the support base 31. The two guide grooves 310 correspond to the two traction mechanisms 32 respectively, and each traction mechanism 32 is slidably connected to the guide groove 310 on the corresponding side. The two guide grooves 310 extend at an angle that gradually moves away from each other along the direction from the first side 11 to the second side 12. This arrangement makes the two guide grooves 310 have an outwardly expanding figure-eight shape. With the center line of the housing 1 as the axis of symmetry, the guide groove 310 on the left side gradually shifts to the left as it extends from the first side 11 to the second side 12, and the guide groove 310 on the right side gradually shifts to the right as it extends from the first side 11 to the second side 12. When the drive mechanism 33 drives the left-side traction mechanism 32 to move along the left-side guide groove 310 towards the second side 12, the traction mechanism 32 not only moves towards the second side 12 of the housing 1, but also tends to move closer to the left edge of the housing 1. Similarly, the right-side traction mechanism 32 moves towards the second side 12 and simultaneously tends to move closer to the right edge of the housing 1. Since the pulling end 32a of each traction mechanism 32 is connected to the middle position of the corresponding flexible light source structure 2, when the traction mechanism 32 moves towards the second side 12 and outwards at the same time, the flexible light source structure 2 is subjected to a pulling force towards the second side 12 and an outward component force. This outward-expanding pulling effect makes the forces at both ends of the flexible light source structure 2 more balanced and can form a more stable arc deformation state, avoiding excessive local bending or twisting of the flexible light source structure 2. Meanwhile, since the two guide grooves 310 extend outward at an inclined angle, the movement direction of the traction mechanism 32 forms a certain angle with the extension direction of the flexible light source structure 2. When the traction mechanism 32 moves the same distance, the outward-expanding guide grooves 310 can enable the flexible light source structure 2 to obtain a larger lateral expansion angle, thereby further expanding the supplementary lighting range and improving the lighting effect on the side area of ​​the user's face.

[0053] The drive mechanism 33 is used to drive the traction mechanism 32 to move along the guide groove 310, so as to change the traction position of the traction end 32a on the flexible light source structure 2, so that the flexible light source structure 2 bends and deforms to change the light output direction.

[0054] Specifically, the drive mechanism 33 includes a telescopic drive member 331 and a traction rope 332. The telescopic drive member 331 is disposed within the receiving cavity 10 of the housing 1 and has a telescopic end capable of telescopic movement. Optionally, the telescopic drive member 331 can be in the form of a miniature electric push rod, a miniature cylinder, or a miniature hydraulic cylinder. One end of the traction rope 332 is connected to the telescopic end of the telescopic drive member 331, and the other end of the traction rope 332 is connected to the traction mechanism 32, specifically to the slide rod 323 or to the connection between the first traction arm 321 and the second traction arm 322. When the telescopic end of the telescopic drive member 331 telescopically moves, the motion is transmitted to the traction mechanism 32 through the traction rope 332, thereby causing the traction mechanism 32 to slide along the guide groove 310. Since the traction rope 332 is a flexible component, it can adapt to the complex and narrow space layout inside the housing 1. Unlike rigid transmission rods, it does not require the drive mechanism 33 and the traction mechanism 32 to be arranged strictly coaxially. This makes the installation position of the drive mechanism 33 inside the housing 1 more flexible, which is conducive to making full use of the scattered remaining space inside the housing 1 and improving the internal space utilization rate of the terminal.

[0055] During the specific cooperation between the telescopic drive component 331 and the traction rope 332, when the telescopic end of the telescopic drive component 331 extends, the traction rope 332 relaxes. At this time, the traction rope 332 no longer applies tension to the traction mechanism 32, and the flexible light source structure 2 returns to its initial straight or near-straight state due to its own elastic restoring force. When the telescopic end of the telescopic drive component 331 retracts, the traction rope 332 gradually tightens and generates a pulling force towards the telescopic end. The pulling force is transmitted to the traction mechanism 32 through the traction rope 332, overcoming the elastic resistance of the flexible light source structure 2 itself, and pulling the traction mechanism 32 to slide along the guide groove 310 towards the second side 12 of the housing 1, thereby causing the flexible light source structure 2 to bend and deform. By controlling the retraction stroke of the telescopic drive component 331, the sliding displacement of the traction mechanism 32 along the guide groove 310 can be precisely controlled, thereby achieving precise adjustment of the bending degree of the flexible light source structure 2. Because the telescopic drive component 331 has a stroke self-locking characteristic, when the telescopic end stops at a certain position, the traction mechanism 32 also stops at the corresponding guide groove 310 position. The flexible light source structure 2 maintains the bending shape corresponding to that position, and the supplementary light direction can be kept stable without the need for an additional locking mechanism. When it is necessary to change the supplementary light direction, it is only necessary to drive the telescopic end to move to the new target position again.

[0056] Since the guide groove 310 extends from the first side 11 to the second side 12 of the housing 1, and the telescopic drive member 331 is easily constrained by the layout of other components inside the housing 1 when installed inside the housing 1, the telescopic direction of the telescopic drive member 331 is often difficult to completely coincide with the extension direction of the guide groove 310. Therefore, the telescopic direction of the telescopic drive member 331 can be set at an angle to the extension direction of the guide groove 310. By setting the telescopic direction of the telescopic drive member 331 at an angle to the extension direction of the guide groove 310, the telescopic drive member 331 can be arranged in a more advantageous direction inside the housing 1, thereby avoiding positional interference with other internal components. In this arrangement, the traction rope 332 does not extend in a straight line between the telescopic end of the telescopic drive member 331 and the traction mechanism 32, but is rationally guided according to the actual wiring path inside the housing 1.

[0057] Specifically, the telescopic drive member 331 has its telescopic end facing the side of the housing 1, meaning its telescopic direction is approximately perpendicular to the extension direction of the guide groove 310. In this case, the traction rope 332 needs to pass through a steering wheel to achieve force direction conversion. Guided by the guide wheel, the telescopic motion generated by the telescopic end of the telescopic drive member 331 is transmitted to the traction mechanism 32 via the traction rope 332, and can be converted into sliding motion along the direction of the guide groove 310. This allows the telescopic drive member 331 to effectively drive the traction mechanism 32 to move in a predetermined direction even when not collinearly arranged. The vertical arrangement effectively reduces the space occupied by the drive mechanism 33 in the thickness direction of the housing 1, which is beneficial for the overall thickness reduction design of the terminal. It is understood that the specific arrangement direction of the telescopic drive member 331 can be flexibly selected according to the specific conditions of the internal space of the housing 1, and is not limited here.

[0058] Example 2

[0059] This utility model embodiment also provides an access control device, which includes an access control body and a face recognition terminal provided in Embodiment 1, wherein the housing 1 of the face recognition terminal is connected to the access control body.

[0060] The access control body serves as the main load-bearing structure of the access control device, used to install and fix the facial recognition terminal and other functional modules. The connection method between the housing 1 and the access control body can be flexibly selected according to the actual application scenario. For example, it can be detachably fixed through bolt connections, snap-fit ​​connections, or slide rail insertion, facilitating independent assembly, maintenance, and replacement of the facial recognition terminal. In other embodiments, the housing 1 and the access control body can also be integrally molded, with the housing 1 of the facial recognition terminal directly serving as the front panel or part of the front panel of the access control body. This method reduces the number of parts and assembly steps, improving the overall structural compactness and sealing. The access control body may further include a rear cover plate, which covers the rear side of the access control body, forming a housing space together with the access control body to accommodate the terminal's control circuit board, power module, and other electronic components, thereby providing enclosed protection for the internal components.

[0061] The access control device also includes a facial recognition module, which is installed on the access control body and located on the first side 11 of the housing 1, that is, on the side of the access control device facing the person to be identified. The facial recognition module is used to capture the facial image of the person to be identified and perform identity verification.

[0062] Specifically, the face recognition module includes a face recognition camera and an image processing chip. The face recognition camera is used to capture face images, and the image processing chip is used to extract features and compare identities from the captured face images. The position of the face recognition module on the access control unit should correspond to the camera window on the housing 1 to ensure that the face recognition camera can acquire external face images through the window.

[0063] In addition, the face recognition module may also include an infrared supplementary light source or an ambient light sensor. The ambient light sensor is used to detect the current ambient light intensity and transmit the detected light information to the control circuit board. The control circuit board then determines whether the flexible light source structure 2 needs to be activated for supplementary lighting based on the ambient light conditions, and determines parameters such as the supplementary light intensity. The specific model and parameters of the face recognition module are not limited here, and those skilled in the art can select one according to the actual recognition accuracy and response speed requirements.

[0064] The light-emitting side 2a of the flexible light source structure 2 faces the recognition area of ​​the face recognition module, meaning that the direction of the light emitted by the flexible light source structure 2 covers the spatial area in front of the face recognition module where the face of the person to be recognized is located. By aligning the light-emitting side 2a of the flexible light source structure 2 with the recognition area, it is ensured that the supplementary light can effectively illuminate the face of the person to be recognized, thereby improving the image quality acquired by the face recognition module in low-light environments.

[0065] The face recognition module is communicatively connected to the flexible light source structure 2 and the driving mechanism 33, meaning there are signal transmission paths between the face recognition module and the flexible light source structure 2, and between the face recognition module and the driving mechanism 33. The communication connection can be a wired electrical connection via a conductor, or an electrical connection via a ribbon cable or flexible circuit board.

[0066] In practical operation, the face recognition module is configured to send light emission control signals to the flexible light source structure 2 to control its on / off state and light emission intensity. For example, when the ambient light sensor detects that the current ambient illuminance is lower than a preset threshold, the face recognition module sends an on command to the flexible light source structure 2, energizing it and causing each light-emitting unit to emit light. When the ambient illuminance returns to a sufficient level, the face recognition module sends an off command, turning off the flexible light source structure 2 to save energy. Simultaneously, the face recognition module can also send dimming commands to the flexible light source structure 2 based on the correlation between light emission intensity and supplementary lighting effect, adjusting the brightness by regulating the power supply current or pulse width modulation duty cycle.

[0067] Furthermore, the face recognition module is also configured to send a position control signal to the drive mechanism 33 to control the drive mechanism 33 to move the traction mechanism 32, thereby changing the light emission direction of the flexible light source structure 2. During the acquisition of face images, the face recognition module continuously performs quality analysis on the acquired images, such as analyzing the brightness histogram distribution, detecting the presence of local overexposure areas or bright spots, and judging the clarity of facial texture details. When the face recognition module determines that the current supplementary lighting direction causes local overexposure, bright spots, or unclear details in dark areas of the face in the acquired face image, affecting recognition accuracy, the face recognition module calculates the target movement position or target movement distance of the traction mechanism 32 based on the image quality analysis results, and then generates a corresponding position control signal and sends it to the drive mechanism 33. After receiving the position control signal, the drive mechanism 33 drives the traction mechanism 32 to slide along the guide groove 310 to the target position. The flexible light source structure 2 then bends to the corresponding curvature shape, changing the light emission direction so that the supplementary light is projected onto the face area at a more optimal angle. During the continuous image acquisition process of the face recognition module, the above adjustment process can be repeated until the quality of the acquired face image meets the preset recognition requirements, thereby realizing closed-loop adaptive adjustment of the supplementary lighting direction.

[0068] In actual use of the access control device, when a person stands in front of the device for identity verification, the face recognition module first detects the current ambient light level using an ambient light sensor. If the ambient light level is sufficient, it directly acquires and recognizes the face image. If the ambient light level is lower than a preset value, the face recognition module sends a light emission control signal to the flexible light source structure 2, which then activates supplementary lighting. Subsequently, the face recognition module acquires a face image including the supplementary lighting effect and evaluates the image quality. If there is bright reflection or local overexposure in the image, the face recognition module sends a position control signal to the drive mechanism 33. The drive mechanism 33 then moves the traction mechanism 32 along the guide groove 310 to the rearward side via the traction rope 332. Under the pulling action, the flexible light source structure 2 gradually bends, and the light emission direction changes accordingly until the bright reflection area in the acquired image disappears and the facial texture details are clearly discernible. Afterward, the face recognition module performs feature extraction and identity comparison based on the current clear image, outputs the recognition result, and controls the access control device to unlock or refuse operation based on the recognition result.

[0069] Access control devices may also include other auxiliary function modules. For example, a fingerprint unlocking module can be installed on the first side 11 of the access control unit to provide a backup authentication method. When the facial recognition module fails to recognize an individual due to extremely poor lighting conditions or other reasons, or when the number of failures reaches a preset threshold, the person to be identified can authenticate their identity through the fingerprint unlocking module, thus ensuring the availability of the access control device under extreme conditions. The fingerprint unlocking module and the facial recognition module are communicatively connected, complementing each other to jointly improve the reliability of identity verification and the scope of applicable scenarios for the access control device.

[0070] A display screen can also be installed on the access control unit itself, located on the first side 11. This screen displays authentication results, operation prompts, and device operating status. For example, when facial recognition is successful, the screen shows successful verification and the corresponding user information; when recognition fails, the screen displays the reason for the failure and a retry prompt; when the supplementary lighting system is adjusting, the screen can display the corresponding adjustment status information. The display screen allows the person being identified to intuitively understand the current operation progress and result, improving the user-friendliness of the human-computer interaction.

[0071] In addition, the access control device may also include a communication module, which is located within the access control unit and used for data communication with a host computer or cloud server. The facial recognition module can upload captured facial images or extracted feature information to the server for comparison or storage via the communication module, and can also download updated facial feature databases from the server to adapt to application scenarios with frequent personnel changes. The communication module can support wired communication methods, such as Ethernet communication; it can also support wireless communication methods, such as Wi-Fi communication or 4G / 5G mobile communication; the specific communication method is not limited here.

[0072] It should be noted that the process by which the aforementioned face recognition module performs quality analysis on the acquired face image, determines whether there are local overexposures or bright spots, calculates the adjustment amount of the supplementary lighting direction, and generates corresponding light emission control signals and position control signals, as well as the specific control logic of the drive mechanism 33 responding to the position control signal to move the traction mechanism 32 to the target position, all fall within the scope of conventional image processing algorithms and motor control strategies in this field. The above control process can be implemented through a pre-set control program configured in the control circuit board of the access control device. The writing and operation of this control program are based on existing mature image quality evaluation methods and closed-loop feedback control principles. Since the above control methods and programs are not the improvement points of this utility model, the innovation of this utility model mainly lies in achieving controllable adjustment of the supplementary lighting direction through the mechanical cooperation of the flexible light source structure 2 and the adjustment component 3. Therefore, the specific implementation steps and algorithm details of the above control methods and programs will not be elaborated here.

[0073] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A face recognition terminal, characterized in that, include: The housing (1) has a first side (11) and a second side (12) that are disposed opposite to each other. A flexible light source structure (2) is disposed in the housing (1), and the flexible light source structure (2) has a light-emitting side (2a) facing the first side (11). The adjustment component (3) includes a support base (31), a traction mechanism (32), and a drive mechanism (33). The support base (31) is fixedly disposed inside the housing (1). A guide groove (310) extending from the first side (11) to the second side (12) is provided on the support base (31). The traction mechanism (32) is slidably connected to the guide groove (310). The traction mechanism (32) has at least one pulling end (32a). The pulling end (32a) is rotatably connected to the flexible light source structure (2). The drive mechanism (33) can drive the traction mechanism (32) to move along the guide groove (310) to change the pulling position of the pulling end (32a) on the flexible light source structure (2), so that the flexible light source structure (2) bends and deforms to change the light emission direction.

2. The face recognition terminal according to claim 1, characterized in that, The traction mechanism (32) includes a first traction arm (321) and a second traction arm (322). The first traction arm (321) and the second traction arm (322) are set at an angle and fixedly connected to each other. A slide rod (323) is provided at the connection between the first traction arm (321) and the second traction arm (322). The slide rod (323) is slidably fitted in the guide groove (310). The ends of the first traction arm (321) and the second traction arm (322) respectively form a pulling end (32a). Each pulling end (32a) is connected to a different position of the flexible light source structure (2).

3. The face recognition terminal according to claim 2, characterized in that, The support base (31) is located in the middle of the housing (1), and the flexible light source structure (2) includes a first end (21) near the middle of the housing (1) and a second end (22) away from the middle of the housing (1). The pulling end (32a) of the first traction arm (321) is connected to the flexible light source structure (2) at the middle position between the first end (21) and the second end (22); The pulling end (32a) of the second traction arm (322) is connected to the flexible light source structure (2) near the first end (21); The length of the first traction arm (321) is greater than the length of the second traction arm (322).

4. The face recognition terminal according to claim 3, characterized in that, Two flexible light source structures (2) are provided. The two flexible light source structures (2) are symmetrically arranged on both sides of the support base (31) about the support base (31). Each flexible light source structure (2) is respectively provided with a traction mechanism (32). The two traction mechanisms (32) are slidably connected to the same support base (31).

5. The face recognition terminal according to claim 4, characterized in that, The support base (31) is symmetrically provided with two guide grooves (310), and the two guide grooves (310) are respectively provided for two traction mechanisms (32). Each traction mechanism (32) is slidably connected in the guide groove (310) on the corresponding side, and the two guide grooves (310) gradually extend away from each other in the direction from the first side (11) to the second side (12).

6. The face recognition terminal according to claim 1, characterized in that, The flexible light source structure (2) includes a flexible substrate and a plurality of light-emitting units disposed on the flexible substrate. The flexible substrate has a light-emitting side (2a) facing the first side (11) of the housing (1), and the plurality of light-emitting units are distributed on the light-emitting side (2a). A supplementary light window (13) is provided through the first side (11) of the housing (1). The flexible light source structure (2) is housed in the housing (1), and the light-emitting units project light to the outside of the housing (1) through the supplementary light window (13).

7. The face recognition terminal according to claim 1, characterized in that, The drive mechanism (33) includes a telescopic drive member (331) and a traction rope (332). The telescopic drive member (331) is disposed inside the housing (1). One end of the traction rope (332) is connected to the telescopic end of the telescopic drive member (331), and the other end of the traction rope (332) is connected to the traction mechanism (32). The telescopic drive member (331) can drive the traction mechanism (32) to slide along the guide groove (310) through the traction rope (332).

8. The face recognition terminal according to claim 7, characterized in that, The telescopic drive (331) is set at an angle to the extension direction of the guide groove (310).

9. The face recognition terminal according to claim 1, characterized in that, The support base (31) includes an upper support plate (311) and a lower support plate (312) arranged opposite to each other. The upper support plate (311) and the lower support plate (312) are fixedly connected by a support column (313). The upper support plate (311) and the lower support plate (312) are respectively provided with guide grooves (310). The traction mechanism (32) is arranged between the upper support plate (311) and the lower support plate (312) and is slidably engaged in the corresponding guide grooves (310).

10. An access control device, characterized in that, include: Access control unit; The face recognition terminal as described in any one of claims 1 to 9, wherein the housing (1) is connected to the access control body; A face recognition module is disposed on the access control body and located on the first side (11) of the housing (1) for collecting and recognizing face images; The light-emitting side (2a) of the flexible light source structure (2) faces the recognition area of ​​the face recognition module, and the face recognition module is communicatively connected to the flexible light source structure (2) and the driving mechanism (33) respectively. The face recognition module is configured to send a light emission control signal to the flexible light source structure (2) to control the opening and closing of the flexible light source structure (2) and the light emission intensity. The face recognition module can also send a position control signal to the driving mechanism (33) to control the driving mechanism (33) to drive the traction mechanism (32) to move, thereby changing the light emission direction of the flexible light source structure (2).

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