A palm vein recognition device based on infrared imaging

Abstract

The utility model discloses a palm vein recognition device based on infrared imaging, including protection casing, the inboard of protection casing is installed with near infrared image sensor camera and infrared light supplement array respectively, near infrared image sensor camera and infrared light supplement array are in parallel and its opposite side is provided with polarization mechanism, the bottom of protection casing is provided with auxiliary mechanism, the polarization mechanism includes the limiting swivel ring of fixed connection in the inside of protection casing, the inboard rotation of limiting swivel ring is connected with the polarization turnto, the inside installation of polarization turnto has a plurality of polaroid, the inboard fixed connection of polarization turnto has the pivot, the inside fixed connection of protection casing has the bearing, the inboard rotation of bearing is connected with the outside of pivot, the inside fixed connection of protection casing has the drive motor, the output of drive motor is installed with transmission belt through the shaft coupling and synchronous pulley, the outside of pivot is fixedly connected with the synchronous pulley of the side of driving motor far away.

Description

Technical Field

[0001] This utility model relates to the field of biometric recognition technology, and in particular to a palm vein recognition device based on infrared imaging. Background Technology

[0002] Existing palm vein recognition devices mostly rely on a single infrared light source and a fixed imaging angle, which results in poor adaptability to recognition scenarios. Under conditions such as direct sunlight, low temperature, or dry hands, the vein image is prone to blurring and the feature extraction is incomplete, leading to a decrease in recognition accuracy or an increase in false recognition rate.

[0003] Palm vein recognition products are mostly based on near-infrared light illumination. The near-infrared light source and the sensor imaging device are placed on the same side of the palm for reflective imaging. Currently, the recognition is activated by detecting the approach of an object when the palm is placed directly above the camera, thus enabling palm vein recognition. However, in crowded places, interference from objects other than the palm often causes the near-infrared light to be turned on frequently, increasing the activation time and power consumption of the infrared supplementary light array and reducing the lifespan of the infrared supplementary light.

[0004] An existing patent (publication number: CN218247200U) discloses a palm vein recognition device based on thermal imaging. The device uses a thermal imaging sensor camera to detect body temperature and acquire a thermal map. After the image recognition unit identifies palm information from the thermal map, the control unit activates the infrared supplementary light array, enabling the near-infrared image sensor camera to acquire palm vein images. This avoids interference from objects other than the palm, reduces the activation time and power consumption of the infrared supplementary light array, and extends its lifespan. Simultaneously, the thermal imaging sensor camera can detect body temperature, allowing for timely identification of individuals with abnormal body temperatures during epidemics, which is beneficial for epidemic prevention and control.

[0005] To address the aforementioned issues, existing patents offer solutions. However, existing infrared imaging-based palm vein recognition devices, when acquiring vein images, can only filter stray light from a fixed direction. In scenarios with strong direct sunlight or complex ambient light, a large amount of reflective stray light from non-target directions cannot be effectively filtered out, resulting in blurred vein images and low contrast between veins and surrounding tissues. This affects the completeness and accuracy of feature extraction. Furthermore, they typically use a fixed imaging angle for palm vein acquisition. Since the acquisition angle cannot be adjusted according to the user's hand size, hand placement habits, or installation scenario, even slight deviations in the user's hand placement angle can cause the core area of ​​the palm veins to extend beyond the acquisition field of view, leading to incomplete vein feature acquisition and affecting subsequent recognition efficiency.

[0006] To address this, a palm vein recognition device based on infrared imaging is proposed. Utility Model Content

[0007] The purpose of this invention is to provide a palm vein recognition device based on infrared imaging. This device addresses the shortcomings of existing infrared imaging-based palm vein recognition devices. When acquiring vein images, these devices can only filter stray light from a fixed direction. In scenarios with strong direct light or complex ambient light, a large amount of reflective stray light from non-target directions cannot be effectively filtered, resulting in blurred vein images, low contrast between veins and surrounding tissues, and affecting the completeness and accuracy of feature extraction. Furthermore, the device typically uses a fixed imaging angle for palm vein acquisition. Since the acquisition angle cannot be adjusted according to the user's hand size, hand placement habits, or installation scenario, even slight deviations in the user's hand placement angle can cause the core area of ​​the palm vein to extend beyond the acquisition field of view, leading to incomplete vein feature acquisition and affecting subsequent recognition efficiency.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a palm vein recognition device based on infrared imaging, comprising a protective housing, wherein a near-infrared image sensor camera and an infrared supplementary light array are respectively installed on the inner side of the protective housing, the near-infrared image sensor camera and the infrared supplementary light array are arranged in parallel and a polarization mechanism is provided on their opposite sides, an auxiliary mechanism is provided at the bottom of the protective housing, the polarization mechanism includes a limiting rotating ring fixedly connected inside the protective housing, a polarization rotating frame rotatably connected to the inner side of the limiting rotating ring, a plurality of polarizers installed inside the polarization rotating frame, a rotating shaft fixedly connected to the inner side of the polarization rotating frame, a bearing fixedly connected inside the protective housing, the inner side of the bearing rotatably connected to the outer side of the rotating shaft, a drive motor fixedly connected inside the protective housing, a transmission belt installed at the output end of the drive motor through a coupling and a synchronous pulley, and the outer side of the rotating shaft fixedly connected to a synchronous pulley on the side away from the drive motor.

[0009] Preferably, the auxiliary mechanism includes a drive cylinder rotatably connected to the bottom of the protective housing, and a mounting base is rotatably connected to the bottom of the drive cylinder.

[0010] Preferably, a first rotating seat is fixedly connected to both sides of the mounting base, a limiting sleeve is rotatably connected inside the first rotating seat, and a limiting slide rod is slidably connected inside the limiting sleeve.

[0011] Preferably, a second rotating seat is fixedly connected to the bottom of the limiting slide rod away from the limiting sleeve, and the top of the second rotating seat is fixedly connected to the bottom of the protective shell.

[0012] Preferably, a liquid crystal display screen is installed on the surface of the protective housing, a palm vein sensor is installed inside the protective housing, and a level sensor is installed at the bottom of the protective housing.

[0013] Preferably, a connecting base is fixedly connected to the top of the protective housing, and a connecting housing is rotatably connected to the top of the connecting base. An NFC identification module is installed inside the connecting housing.

[0014] Preferably, a mounting base is fixedly connected to the outer side of the connecting housing, and a mounting hole is provided on the outer side of the mounting base.

[0015] Preferably, an auxiliary spring is sleeved on the outer side of the limiting slide rod, and the auxiliary spring is located inside the limiting sleeve.

[0016] Preferably, a base is installed at the bottom of the infrared supplementary light array, and a constant temperature cavity is fixedly connected to the top of the base. A temperature sensor is installed inside the constant temperature cavity, and a control power supply is fixedly connected to the outside of the constant temperature cavity. A heating wire is electrically connected to the outside of the control power supply, and the heating wire is located inside the constant temperature cavity.

[0017] Preferably, a support frame is fixedly connected inside the protective housing, and a filter is fixedly connected inside the support frame. The filter is located at the bottom of the near-infrared image sensor camera.

[0018] Compared with the prior art, the beneficial effects of this utility model are:

[0019] 1. This application achieves the effect of accurately filtering ambient reflected stray light through a polarization mechanism, improving the contrast and clarity of palm vein images. Compared with traditional palm vein recognition devices with a single polarization direction or no polarization design, this mechanism can adapt to various lighting scenarios by switching polarizers with different polarization directions, and can achieve dynamic anti-interference function. It solves the problem that existing devices cause blurred vein images and incomplete feature extraction in complex environments such as strong direct light, resulting in decreased recognition accuracy or increased false recognition rate.

[0020] 2. This application achieves flexible adjustment of the acquisition angle of the protective shell through the auxiliary mechanism, improving the adaptability of the device to different user habits and installation scenarios. Compared with traditional palm vein recognition devices with fixed imaging angles, this mechanism can smoothly adjust the angle through the buffer structure, realizing the function of adaptive adjustment of the acquisition angle. This solves the problem that existing devices, due to their fixed imaging angle, cause inconvenience for some users in placing their palms and incomplete acquisition of vein features, affecting recognition efficiency and user experience. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of a palm vein recognition device based on infrared imaging according to this utility model;

[0022] Figure 2 This is a schematic diagram of the bottom of the protective shell of this utility model;

[0023] Figure 3 This is a schematic diagram showing the disassembled infrared supplementary lighting array of this utility model;

[0024] Figure 4 This is a schematic diagram of the polarization mechanism of this utility model;

[0025] Figure 5 This is a schematic diagram of the auxiliary mechanism of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the base of this utility model.

[0027] In the diagram, 1. Protective housing; 2. Near-infrared image sensor camera; 3. Infrared supplementary light array; 4. Polarization mechanism; 41. Limiting rotating ring; 42. Polarization rotating frame; 43. Rotating shaft; 44. Bearing; 45. Drive motor; 46. Transmission belt; 5. Auxiliary mechanism; 51. Drive cylinder; 52. Mounting base; 53. First rotating seat; 54. Limiting sleeve; 55. Limiting slide bar; 56. Second rotating seat; 6. LCD screen; 7. Connecting seat; 8. Connecting housing; 9. NFC identification module; 10. Mounting seat; 11. Mounting hole; 12. Auxiliary spring; 13. Base; 14. Constant temperature chamber; 15. Control power supply; 16. Heating wire; 17. Support frame; 18. Filter. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figure 1-6 The present invention provides the following technical solution:

[0030] A palm vein recognition device based on infrared imaging includes a protective housing 1. A near-infrared image sensor camera 2 and an infrared supplementary light array 3 are respectively installed on the inner side of the protective housing 1. The near-infrared image sensor camera 2 and the infrared supplementary light array 3 are arranged side-by-side, and a polarization mechanism 4 is arranged on their opposite sides. An auxiliary mechanism 5 is arranged at the bottom of the protective housing 1. The polarization mechanism 4 includes a limiting rotating ring 41 fixedly connected inside the protective housing 1. A polarization frame 42 is rotatably connected to the inner side of the limiting rotating ring 41. Several polarizers are installed inside the polarization frame 42. A rotating shaft 43 is fixedly connected to the inner side of the polarization frame 42. A bearing 44 is fixedly connected inside the protective housing 1. The inner side of the bearing 44 is rotatably connected to the outer side of the rotating shaft 43. A drive motor 45 is fixedly connected inside the protective housing 1. A transmission belt 46 is installed at the output end of the drive motor 45 through a coupling and a synchronous pulley. The outer side of the rotating shaft 43 is fixedly connected to a synchronous pulley on the side away from the drive motor 45.

[0031] In this embodiment: when the device is started and triggered by the palm vein sensor, the drive motor 45 inside the protective housing 1 begins to work. Its output end drives the synchronous pulley to rotate through the coupling. The synchronous pulley drives the transmission belt 46 to rotate, and the transmission belt 46 in turn drives the synchronous pulley on the outer side of the rotating shaft 43 away from the drive motor 45 to rotate, causing the rotating shaft 43 to rotate accordingly. Since the rotating shaft 43 is rotatably connected to the inner side of the bearing 44 fixed inside the protective housing 1, the bearing 44 provides stable support and limit for the rotating shaft 43, ensuring that the rotating shaft 43 rotates smoothly and without... When a shift occurs, the rotating shaft 43 rotates, causing the polarization frame 42, which is fixed to it, to rotate synchronously inside the limiting ring 41. The limiting ring 41 restricts the rotation trajectory of the polarization frame 42 to prevent it from leaving the optical path. Multiple sets of polarizers with different polarization directions installed inside the polarization frame 42 rotate with the frame and alternately enter the optical path between the infrared supplementary light array 3 and the near-infrared image sensor camera 2. The appropriate polarization direction is selected according to the ambient light conditions, effectively filtering out reflected stray light generated by strong direct light, etc., and improving the clarity and contrast of the vein image.

[0032] Specifically, such as Figure 5 As shown, the auxiliary mechanism 5 includes a drive cylinder 51 rotatably connected to the bottom of the protective housing 1, and a mounting base 52 rotatably connected to the bottom of the drive cylinder 51.

[0033] Specifically, such as Figure 5 As shown, a first rotating seat 53 is fixedly connected to both sides of the mounting base 52. A limit sleeve 54 is rotatably connected inside the first rotating seat 53, and a limit slide rod 55 is slidably connected inside the limit sleeve 54.

[0034] Specifically, such as Figure 5As shown, a second rotating seat 56 is fixedly connected to the bottom of the limiting slide bar 55 away from the limiting sleeve 54, and the top of the second rotating seat 56 is fixedly connected to the bottom of the protective housing 1.

[0035] In this embodiment: when it is necessary to adjust the acquisition angle of the protective housing 1 according to the user's palm size, placement habits, or installation scenario, the drive cylinder 51 rotatably connected to the bottom of the protective housing 1 is activated. The telescopic end of the drive cylinder 51 pushes the protective housing 1 to rotate around its connection point with the drive cylinder 51. The second rotating seat 56 fixed at the bottom of the protective housing 1 moves synchronously with the protective housing 1, driving the limiting slide rod 55 fixed thereto to move. The limiting slide rod 55 rotates and slides synchronously inside the limiting sleeve 54 rotatably connected to the first rotating seats 53 on both sides of the mounting base 52, realizing flexible adjustment of the angle of the protective housing 1. The auxiliary spring 12 on the outside of the limiting slide rod 55 generates elastic deformation during the sliding process, playing a buffering and shock-absorbing role, avoiding rigid collisions between components. The mounting base 52 provides stable support for the entire auxiliary mechanism 5, ensuring the overall structure of the device is stable during the angle adjustment process. After adjusting to a suitable angle, the drive cylinder 51 locks the telescopic end, keeping the protective housing 1 at that angle, ensuring that the core area of ​​the palm vein can be effectively acquired in different scenarios.

[0036] Specifically, such as Figure 1 As shown, a liquid crystal display screen 6 is installed on the surface of the protective housing 1, a palm vein sensor is installed inside the protective housing 1, and a horizontal sensor is installed at the bottom of the protective housing 1.

[0037] Specifically, such as Figure 1 , Figure 2 As shown, a connector 7 is fixedly connected to the top of the protective housing 1, and a connector housing 8 is rotatably connected to the top of the connector 7. An NFC identification module 9 is installed inside the connector housing 8.

[0038] In this embodiment: by setting up an LCD screen 6, a palm vein sensor, and a level sensor, the LCD screen 6 lights up synchronously after the device is started, displaying real-time hand placement guidance, recognition progress, and success or failure prompts, making it convenient for users to intuitively understand the operation process and device operating status, reducing recognition delays caused by improper operation. The palm vein sensor continuously monitors the collection area. When the user brings their palm close to the collection area, the sensor quickly senses the palm outline and distance, accurately determining whether it is a valid recognition target, avoiding non-palm objects triggering device startup, and reducing the invalid activation frequency of the infrared supplementary light array 3. At the same time, the level sensor detects the horizontal status of the device after installation in real time, and promptly feeds back the horizontal data after the device angle is adjusted. By setting up a connector 7, a connecting shell 8, and an NFC identification module 9, when the user needs to quickly bind their identity, they can use an NFC card to approach the connecting shell 8 on the top of the protective shell 1. After the NFC identification module 9 inside the connecting shell 8 senses the card or device, it quickly reads the identity information, completing the association binding between the user's identity and palm vein features, or directly using it as a backup verification method to pass identity verification, improving the device's flexibility and scenario adaptability.

[0039] Specifically, such as Figure 1 , Figure 2 As shown, a mounting base 10 is fixedly connected to the outer side of the connecting housing 8, and a mounting hole 11 is provided on the outer side of the mounting base 10.

[0040] Specifically, such as Figure 5 As shown, an auxiliary spring 12 is sleeved on the outer side of the limiting slide bar 55, and the auxiliary spring 12 is located inside the limiting sleeve 54.

[0041] In this embodiment: By setting the mounting base 10 and mounting hole 11, during the device installation stage, the operator uses bolts or other fasteners to fix the connecting housing 8 to the preset installation position or external bracket through the mounting hole 11 on the mounting base 10 on the outside of the connecting housing 8. By setting the auxiliary spring 12, when the drive cylinder 51 drives the protective housing 1 to adjust the angle, the second rotating seat 56 at the bottom of the protective housing 1 drives the limiting slide rod 55 to slide and rotate inside the limiting sleeve 54. The auxiliary spring 12 on the outside of the limiting slide rod 55 is inside the limiting sleeve 54. As the limiting slide rod 55 slides, the auxiliary spring 12 is compressed or stretched. The buffer force generated by its elastic deformation offsets the impact force during the angle adjustment process, avoiding rigid collision between the limiting slide rod 55 and the limiting sleeve 54, and at the same time avoiding displacement of internal components of the device due to collision, thus ensuring imaging accuracy.

[0042] Specifically, such as Figure 3 , Figure 6As shown, a base 13 is installed at the bottom of the infrared supplementary light array 3, and a constant temperature cavity 14 is fixedly connected to the top of the base 13. A temperature sensor is installed inside the constant temperature cavity 14, and a control power supply 15 is fixedly connected to the outside of the constant temperature cavity 14. A heating wire 16 is electrically connected to the outside of the control power supply 15, and the heating wire 16 is located inside the constant temperature cavity 14.

[0043] Specifically, such as Figure 3 As shown, a support frame 17 is fixedly connected inside the protective housing 1, and a filter 18 is fixedly connected inside the support frame 17. The filter 18 is located at the bottom of the near-infrared image sensor camera 2.

[0044] In this embodiment: by setting up a substrate 13, a constant temperature cavity 14, a temperature sensor, a control power supply 15, and a heating wire 16, when the infrared supplementary light array 3 is working, its temperature sensor monitors the ambient temperature around the infrared supplementary light array 3 and its own operating temperature in real time. When the temperature sensor detects that the temperature is too low, which may affect the luminous intensity and stability of the infrared supplementary light array 3, it sends a signal to the control power supply 15 outside the constant temperature cavity 14. The control power supply 15 then starts and supplies power to the electrically connected heating wire 16. The heating wire 16 heats up inside the constant temperature cavity 14, providing a suitable operating temperature for the infrared supplementary light array 3 through heat conduction, ensuring the infrared... The supplementary light array 3 always emits infrared light of stable intensity to avoid blurring of vein images due to low temperature and ensure the recognition accuracy of the device in extreme low temperature environments. By setting up the support frame 17 and the filter 18, the infrared light emitted by the infrared supplementary light array 3 is filtered by the polarization mechanism 4 and then shines on the user's palm and is reflected to form vein characteristic light. When this characteristic light propagates into the protective housing 1, it will first pass through the filter 18 fixed by the support frame 17. The filter 18 accurately selects the target wavelength light that meets the imaging requirements of the near-infrared image sensor camera 2, and filters out interference light such as visible light and clutter wavelengths, further improving the purity of the vein characteristic light.

[0045] Working Principle: When using this palm vein recognition device, the user's identity is initially linked by the NFC recognition module 9 installed inside the housing 8. The LCD screen 6 on the surface of the protective housing 1 displays the operation instructions and recognition status in real time, allowing the user to understand the device's operation status promptly. When the user places their palm near the collection area, the palm vein sensor inside detects the palm and triggers the infrared supplementary light array 3 to start working. At the same time, the temperature sensor inside the constant temperature cavity 14 monitors the ambient temperature and the temperature around the infrared supplementary light array 3 in real time. If the temperature is detected to be too low, affecting the light emission stability of the infrared supplementary light array 3, the control power supply 15 fixed on the outside of the constant temperature cavity 14 will activate the electrically connected heating wire 16. The heating wire 16 emits light within the constant temperature cavity 14. The heat provides a suitable operating temperature for the infrared supplementary light array 3, ensuring stable luminous intensity. The infrared light emitted by the infrared supplementary light array 3 first enters the polarization mechanism 4, activating the drive motor 45 fixed inside the protective housing 1. The output end of the drive motor 45 drives the transmission belt 46 to rotate through a coupling and a synchronous pulley. The transmission belt 46 further drives the synchronous pulley on the outer side of the rotating shaft 43 away from the drive motor 45 to rotate, causing the rotating shaft 43 fixed to the synchronous pulley to rotate accordingly. Since the outer side of the rotating shaft 43 is rotatably connected to the inner side of the bearing 44 fixed inside the protective housing 1, the rotating shaft 43 achieves stable rotation under the limiting support of the bearing 44, thereby driving the polarization frame 42 fixed to the rotating shaft 43 to rotate synchronously inside the limiting ring 41 fixed inside the protective housing 1. As the polarization frame 42 rotates, several polarizers with different polarization directions are installed inside. These polarizers alternately enter the infrared light path, filtering out stray light and effectively improving the contrast of the vein image. The filtered infrared light is then directed onto the user's palm. The veins in the palm absorb the infrared light, while surrounding tissues reflect it, forming vein characteristic light. This vein characteristic light then passes through a filter 18 fixed to the support frame 17 inside the protective housing 1. The filter 18 selects the target wavelength light that meets the imaging requirements of the near-infrared image sensor camera 2. Finally, the near-infrared image sensor, which is arranged parallel to the infrared supplementary light array 3 inside the protective housing 1, transmits the light. Camera 2 captures a clear image of the palm vein, completing the image acquisition process. When the acquisition angle of the protective housing 1 needs to be adjusted according to different user habits, the drive cylinder 51 is activated. The drive cylinder 51 pushes the protective housing 1 to rotate around its connection point with the drive cylinder 51. The second rotating seat 56 fixed at the bottom of the protective housing 1 moves synchronously with the protective housing 1, driving the limiting slide rod 55 fixed to the second rotating seat 56 to move. The limiting slide rod 55 rotates and slides simultaneously inside the limiting sleeve 54 rotatably connected to the first rotating seats 53 on both sides of the mounting base 52. The auxiliary spring 12 sleeved on the outside of the limiting slide rod 55 is located inside the limiting sleeve 54. During the sliding process of the limiting slide rod 55, pressure is generated on the auxiliary spring 12, causing the auxiliary spring 12 to contract.The elastic deformation of the spring acts as a buffer and shock absorber, preventing damage to components from rigid collisions during angle adjustment. Simultaneously, a level sensor at the bottom of the protective housing 1 monitors its horizontal status in real time, ensuring that the housing remains stable after angle adjustment. This guarantees the accuracy of subsequent palm vein image acquisition, enabling stable and efficient recognition in various scenarios.

[0046] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A palm vein recognition device based on infrared imaging, comprising a protective housing (1), characterized in that: The protective housing (1) has a near-infrared image sensor camera (2) and an infrared filler array (3) installed on its inner side. The near-infrared image sensor camera (2) and the infrared filler array (3) are arranged side by side and a polarization mechanism (4) is provided on their opposite sides. An auxiliary mechanism (5) is provided at the bottom of the protective housing (1). The polarization mechanism (4) includes a limiting rotating ring (41) fixedly connected to the inside of the protective housing (1). A polarization rotating frame (42) is rotatably connected to the inner side of the limiting rotating ring (41). The protective housing (1) has several polarizers installed inside. The inner side of the polarizing frame (42) is fixedly connected to a rotating shaft (43). The inner side of the protective housing (1) is fixedly connected to a bearing (44). The inner side of the bearing (44) is rotatably connected to the outer side of the rotating shaft (43). The inner side of the protective housing (1) is fixedly connected to a drive motor (45). The output end of the drive motor (45) is equipped with a transmission belt (46) through a coupling and a synchronous pulley. The outer side of the rotating shaft (43) is fixedly connected to a synchronous pulley on the side away from the drive motor (45).

2. The palm vein recognition device based on infrared imaging according to claim 1, characterized in that: The auxiliary mechanism (5) includes a drive cylinder (51) rotatably connected to the bottom of the protective housing (1), and a mounting base (52) is rotatably connected to the bottom of the drive cylinder (51).

3. The palm vein recognition device based on infrared imaging according to claim 2, characterized in that: Both sides of the mounting base (52) are fixedly connected to a first rotating seat (53). The first rotating seat (53) is rotatably connected to a limiting sleeve (54), and the limiting sleeve (54) is slidably connected to a limiting slide rod (55).

4. The palm vein recognition device based on infrared imaging according to claim 3, characterized in that: The bottom of the limiting slide bar (55) away from the limiting sleeve (54) is fixedly connected to a second rotating seat (56), and the top of the second rotating seat (56) is fixedly connected to the bottom of the protective shell (1).

5. The palm vein recognition device based on infrared imaging according to claim 1, characterized in that: The protective housing (1) is equipped with a liquid crystal display screen (6) on its surface, a palm vein sensor is installed inside the protective housing (1), and a horizontal sensor is installed at the bottom of the protective housing (1).

6. The palm vein recognition device based on infrared imaging according to claim 1, characterized in that: The top of the protective housing (1) is fixedly connected to a connecting seat (7), and the top of the connecting seat (7) is rotatably connected to a connecting housing (8). An NFC identification module (9) is installed inside the connecting housing (8).

7. A palm vein recognition device based on infrared imaging according to claim 6, characterized in that: A mounting base (10) is fixedly connected to the outer side of the connecting housing (8), and a mounting hole (11) is provided on the outer side of the mounting base (10).

8. A palm vein recognition device based on infrared imaging according to claim 3, characterized in that: An auxiliary spring (12) is sleeved on the outside of the limiting slide bar (55), and the auxiliary spring (12) is located inside the limiting sleeve (54).

9. A palm vein recognition device based on infrared imaging according to claim 1, characterized in that: The infrared supplementary light array (3) has a base (13) installed at the bottom, and a constant temperature cavity (14) is fixedly connected to the top of the base (13). A temperature sensor is installed inside the constant temperature cavity (14), and a control power supply (15) is fixedly connected to the outside of the constant temperature cavity (14). A heating wire (16) is electrically connected to the outside of the control power supply (15), and the heating wire (16) is located inside the constant temperature cavity (14).

10. A palm vein recognition device based on infrared imaging according to claim 1, characterized in that: The protective housing (1) is fixedly connected to a support frame (17), and the support frame (17) is fixedly connected to a filter (18), which is located at the bottom of the near-infrared image sensor camera (2).

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