A three-color time-sharing tunnel light source

Abstract

The utility model discloses a three color time-sharing tunnel light source, including light source body, the lower part of light source body is equipped with printed matter, printed matter is relative light source body removes, the upper portion of light source body is equipped with camera, camera still is connected with the analysis judgment system for processing the image information detected by camera, light source body includes the first light emitting component of installation on one side and the second light emitting component of installation on the other side, first light emitting component and second light emitting component are arranged side by side, and the lower part is equipped with light ray exit, and the upper portion is equipped with light ray receiving mouth, first light emitting component and second light emitting component emit red, green and blue three kinds of light through light ray exit alternately, and light irradiation is on printed matter, and passes through the reflection of printed matter, and passes through light ray receiving mouth and enters the camera, the utility model discloses through alternately outputting red, green, blue three color light, cooperation time-sharing imaging technique realizes real color restoration, and gives consideration to spatial adaptability and economy.

Description

Technical Field

[0001] This utility model relates to tunnel light sources in the field of printing inspection, and particularly to a three-color time-division tunnel light source. Background Technology

[0002] In the field of quality inspection of printed products, such as packaging, books, and labels, color reproduction is one of the key indicators for evaluating the accuracy of test results.

[0003] Currently, the mainstream inspection solution in the industry adopts a combination of "pseudo-color line scanning camera and tunneling light": tunneling light provides uniform illumination required for inspection, and the pseudo-color line scanning camera acquires images of the printed surface to achieve defect identification and color judgment. However, the above solution has significant drawbacks: the color reproduction principle of the pseudo-color line scanning camera is based on a specific algorithm to color map grayscale images, rather than truly reproducing the RGB color information of the object. This causes the acquired images to easily show mixed colors that do not match the actual colors of the printed matter when magnified, and areas that should be pure colors may exhibit color deviation and color mixing, seriously affecting the accuracy of the inspection results. Especially for the inspection of high-precision printed materials, this defect can directly lead to misjudgment or missed judgment.

[0004] To address the color reproduction issue, some solutions use true-color line scanners instead of pseudo-color line scanners. However, true-color line scanners have complex internal optical structures and require high precision from their photosensitive elements. They are not only much larger than pseudo-color line scanners, making them difficult to fit into small detection spaces, but they also typically cost several times more than pseudo-color line scanners. This places a significant burden on companies in terms of equipment procurement and maintenance, hindering large-scale application. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies, such as difficulty in color judgment and high cost, and to provide a three-color time-division tunnel light source. By alternately outputting red, green and blue light, combined with time-division imaging technology, it can achieve true color reproduction, taking into account spatial adaptability and economy, and is suitable for various online inspection scenarios of printed materials.

[0006] To achieve the above objectives, this utility model provides a three-color time-division tunnel light source, comprising a light source body, a printed material disposed at the lower part of the light source body, the printed material being movable relative to the light source body, a camera disposed at the upper part of the light source body, and the camera being connected to an analysis and judgment system for processing image information detected by the camera; the light source body includes a first light-emitting component mounted on one side and a second light-emitting component mounted on the other side, the first and second light-emitting components being arranged side by side, a light emission outlet at the lower part and a light receiving port at the upper part; the first and second light-emitting components alternately emit red, green and blue light through the light emission outlet, the light irradiates the printed material, and after reflection from the printed material, passes through the light receiving port and enters the camera.

[0007] Preferably, the first light-emitting component and the second light-emitting component are set independently, and together they form the light source body.

[0008] Preferably, both ends of the first light-emitting component and the second light-emitting component are provided with end plates, one end of which is connected to the first light-emitting component and the other end is connected to the second light-emitting component; the first light-emitting component, the second light-emitting component and the end plates are connected together to form the light source body.

[0009] Preferably, the first and second light-emitting components emit light downwards at an angle, and the first and second light-emitting components are symmetrically arranged to concentrate the light emitted by the first and second light-emitting components, which then illuminate the printed material through the light emission outlet.

[0010] Preferably, both the first and second light-emitting components include a base plate mounted on the lower part, a PCB board is provided on the base plate, a plurality of tri-color LED beads are mounted on the PCB board, an arc-shaped reflector is mounted on the upper part of the tri-color LED beads, the tri-color LED beads emit light upwards, and after being reflected by the arc-shaped reflector, they illuminate the printed material through the light outlet.

[0011] Preferably, the tri-color LED includes a red LED, a green LED, and a blue LED. The tri-color LED is electrically connected to a light source control module. The light source control module has a built-in time-division control unit that controls the tri-color LED to alternately output red, green, and blue light. The red, green, and blue LEDs are lit sequentially according to a preset frequency to achieve cyclical time-division lighting of red, green, and blue light.

[0012] Preferably, the camera is a grayscale line scan camera, which acquires grayscale images of the printed matter under red, green and blue monochromatic light at different time periods, and then combines the three sets of images into a full-color image to achieve true color reproduction.

[0013] Preferably, the base plate is L-shaped, comprising a horizontally placed plate and a vertically placed plate. A PCB board is mounted on the horizontally placed plate, and the vertically placed plate is connected to one side of the arc-shaped reflector. The first and second light-emitting components also include a side plate mounted on the upper part of the arc-shaped reflector. The side plate is also L-shaped. The lower part of the side plate is connected to the vertically placed plate, and the upper part is connected to the other side of the arc-shaped reflector. The side plate and the arc-shaped reflector form a cavity. The side plate is also provided with several ventilation holes, and a cooling fan is installed on the ventilation holes to exchange the air in the cavity with the outside air.

[0014] Preferably, the end plate is installed inside the side plate to seal the cavity; both ends of the end plate are fixedly connected to the vertical plate, and the side is fixedly connected to the side plate.

[0015] Preferably, the first light-emitting component and the second light-emitting component further include a power cord, which passes through the side plate and the vertical plate in sequence, and is electrically connected to the PCB board at its end, driving the light source control module to send a light-emitting signal to the tri-color LED beads, so that the tri-color LED beads emit light; the side plate is equipped with a plurality of connection terminals for connecting the power cord.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. In this invention, the first and second light-emitting components alternately emit red, green, and blue light through light emission outlets. The light shines on the printed material, is reflected by the printed material, and enters the camera through the light receiving port. With the help of time-division imaging technology, the camera can capture grayscale images of the object under the three monochromatic lights at different time periods. The three sets of images are then combined to form a full-color image, achieving true color reproduction. Furthermore, by precisely controlling the timing and intensity of the three-color LED beads, it is ensured that each pixel can be independently illuminated by red, green, and blue light in sequence during high-speed scanning. Combined with synchronous triggering of the camera's time-division exposure, grayscale images of the corresponding channels are acquired. After the image processing unit performs pixel-level registration and color synthesis on the three frames of images at the same position, a high-fidelity full-color image can be reconstructed, truly restoring the color details of the printed material.

[0018] 2. The camera described in this utility model adopts a grayscale line scan camera, which has strong compatibility and can effectively reduce the dependence on high-cost true color cameras. While ensuring detection accuracy, it also takes into account spatial adaptability and economy, and is suitable for various online inspection scenarios of printed materials. Furthermore, without sacrificing imaging accuracy, this utility model avoids the structural limitations and high costs of true color cameras, while improving the system's ability to recognize complex color textures, and is suitable for high-end printing inspection scenarios with strict requirements for color consistency. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of a three-color time-division tunneling light source provided by this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of a three-color time-division tunnel light source with end plate removal provided by this utility model;

[0022] Figure 3 This is a cross-sectional schematic diagram of a three-color time-division tunneling light source provided by this utility model;

[0023] Figure 4 This is an enlarged schematic diagram of the base plate and tri-color LED beads provided by this utility model;

[0024] Figure 5 This is a schematic diagram of the structure of the arc-shaped reflector provided by this utility model;

[0025] Figure 6 This is a schematic diagram of the inner side of the end plate provided by this utility model.

[0026] The diagram includes:

[0027] 1. Light source body; 9. Printed material; 8. Camera; 7. Analysis and judgment system; 51. First light-emitting component; 52. Second light-emitting component; 23. Light emission outlet; 3. Light receiving port; 6. End plate; 21. Base plate; 22. PCB board; 25. Tri-color LED beads; 24. Curved reflector; 251. Red LED bead; 252. Green LED bead; 253. Blue LED bead; 211. Horizontal placement plate; 212. Vertical standing plate; 26. Side plate; 27. Cavity; 28. Vent hole; 29. ​​Connecting terminal. Detailed Implementation

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

[0029] Please refer to Figures 1 to 6 This utility model provides a three-color time-division tunneling light source.

[0030] like Figure 1 and Figure 3 As shown, the three-color time-division tunnel light source includes a light source body 1, which is elongated and fixedly positioned above the printed material 9. The printed material 9 moves relative to the light source body 1. In this embodiment, the printed material 9 moves horizontally, which facilitates the camera 8 positioned on the upper part of the light source body 1 to take pictures. The camera 8 is also connected to an analysis and judgment system 7, which is used to process the image information detected by the camera 8. The camera 8 captures the image information reflected after being illuminated by the light source body 1 through the light receiving port 3 and transmits the data to the analysis and judgment system 7 for real-time comparison and analysis.

[0031] like Figure 1 As shown, the light source body 1 includes a first light-emitting component 51 mounted on one side and a second light-emitting component 52 mounted on the other side. The first light-emitting component 51 and the second light-emitting component 52 are arranged side by side, with a light emission outlet 23 at the bottom and a light receiving outlet 3 at the top; Figure 3 As shown, the first light-emitting component 51 and the second light-emitting component 52 are inclined downwards to emit light. For example, the first light-emitting component 51 on the left side emits three-color light at a certain angle through the light emission outlet 23 onto the surface of the printed matter 9, and the second light-emitting component 52 on the right side also emits three-color light at a certain angle onto the surface of the printed matter 9 through the light emission outlet 23. The light emitted by the first light-emitting component 51 and the second light-emitting component 52 has an overlapping part, forming a uniform composite illumination effect on the surface of the printed matter 9 in the overlapping area. This composite illumination effectively eliminates the uneven local reflection phenomenon caused by differences in texture or ink on the surface of the printed matter, improving the consistency of imaging. The three-color light is emitted sequentially in a time-division lighting manner, consisting of red, green, and blue light. The light shines on the printed matter 9, is reflected by the printed matter 9, and enters the camera 8 through the light receiving port 3.

[0032] The time-division lighting system, controlled by a time-division control unit, alternately outputs red, green, and blue light from the tri-color LED beads 25. Only one color light is projected onto the surface of the printed material 9 at a time, ensuring that the camera 8 captures a reflection image of a single color channel at any given moment, thus avoiding color crosstalk. Through time-division synchronous triggering and image acquisition of the three colors, the analysis and judgment system 7 can accurately obtain the visual characteristics of the printed material 9 under different wavelengths of light, thereby achieving high-precision detection of color deviation, missing prints, or registration errors. The entire lighting structure is compact and suitable for high-speed continuous paper feeding scenarios.

[0033] In one embodiment, the first light-emitting component 51 and the second light-emitting component 52 are independently configured and fixedly mounted on the frame, together forming the light source body 1. This highlights the independence of the first light-emitting component 51 and the second light-emitting component 52, but may require lengthy subsequent adjustments. However, subsequent adjustments can be made to allow for wider applications. The gap between the light emission port 23 and the light receiving port 3 can be adjusted synchronously to adapt to the detection requirements of printed materials of different thicknesses, ensuring precise alignment of the light path.

[0034] However, in this embodiment, in order to facilitate quick installation and subsequent maintenance, the first light-emitting component 51 and the second light-emitting component 52 are integrated into the same modular housing and fixed together by end plates 6 at both ends. One end of the end plate 6 is connected to the first light-emitting component 51 and the other end is connected to the second light-emitting component 52. The first light-emitting component 51, the second light-emitting component 52 and the end plate 6 are connected together to form the light source body 1, forming a stable optical component unit, which simplifies the assembly process and improves structural consistency.

[0035] Of course, the end plate 6 can also be designed as an adjustable structure. Through the use of transverse grooves and fixing bolts, the relative position between the first light-emitting component 51 and the second light-emitting component 52 can be finely adjusted laterally within a certain range, thereby precisely controlling the overlap area and illumination uniformity of the two sets of light. This adjustment method not only improves the equipment's adaptability to different printing materials but also reduces the risk of optical path misalignment caused by mechanical assembly errors, further ensuring the stability of detection accuracy.

[0036] like Figure 3 As shown, the first light-emitting component 51 and the second light-emitting component 52 emit light downwards at an angle. The first light-emitting component 51 and the second light-emitting component 52 are centrally symmetrically arranged, so that the light emitted by the first light-emitting component 51 and the second light-emitting component 52 overlap and are concentrated, and both are irradiated onto the printed matter 9 through the light emission outlet 23.

[0037] like Figure 3 As shown, the first light-emitting component 51 and the second light-emitting component 52 are symmetrically arranged, with their optical axes forming the same angle with the vertical direction. This ensures that the light forms symmetrical illumination on the surface of the printed material 9, effectively eliminating shadow interference. The symmetrical arrangement of the two light sources not only enhances the uniformity of illumination but also significantly improves the detection rate of minute defects on the surface of the printed material 9. After being reflected by the printed material 9, the light enters the imaging system through the light receiving port 3. Combined with time-division acquisition control, this enables frame-by-frame reconstruction of full-color information.

[0038] like Figure 3 and Figure 4As shown, both the first light-emitting component 51 and the second light-emitting component 52 include a base plate 21 mounted on the lower part. A PCB board 22 is provided on the base plate 21. A plurality of tri-color LED beads 25 are mounted on the PCB board 22. An arc-shaped reflector 24 is mounted on the upper part of the tri-color LED beads 25. The tri-color LED beads 25 emit light upwards, which is reflected by the arc-shaped reflector 24 and then shines on the printed matter 9 through the light outlet 23.

[0039] like Figure 3 As shown, a suitable curvature is selected for the arc-shaped reflector 24 so that the light diffuses evenly when it is emitted, avoiding the accumulation of local light spots, thereby improving the flatness of the lighting surface; furthermore, the inner surface of the arc-shaped reflector 24 is coated with a high-reflectivity matte coating, which effectively scatters light and reduces the light intensity fluctuation caused by specular reflection, further ensuring the consistency of lighting.

[0040] like Figure 4 As shown, the tri-color LED 25 includes a red LED 251, a green LED 252, and a blue LED 253. The tri-color LED 25 is electrically connected to a light source control module. This light source control module has a built-in time-division control unit that controls the tri-color LED 25 to alternately output red, green, and blue light. According to a preset frequency, the red LED 251, green LED 252, and blue LED 253 are lit sequentially, achieving cyclical time-division illumination of the red, green, and blue light. The preset frequency is adjustable according to the detection speed requirements and can be between 500-2000Hz. The time-division illumination is synchronized with the image acquisition system, ensuring that only a single color light signal is received per exposure, thereby avoiding color crosstalk and improving image clarity.

[0041] Furthermore, the camera 8 is a grayscale line scan camera. This camera acquires grayscale images of the printed material 9 under red, green, and blue monochromatic light at different time periods. These three images are then combined to create a full-color image, achieving true color reproduction. The red, green, and blue grayscale images acquired in a time-division manner are pixel-level aligned and normalized for brightness. The image processing module then performs weighted fusion to reproduce a high-fidelity color printed image. This method not only avoids the resolution loss caused by Bayer filters but also utilizes the continuity of line scan imaging to improve the smoothness of color transitions. In high-speed inspection scenarios, precise synchronization between the light source frequency and camera exposure effectively suppresses motion blur, ensuring clear and discernible details and textures, providing a reliable basis for judging print quality.

[0042] like Figure 4 As shown, the base plate 21 is L-shaped, including a horizontally placed plate 211 and a vertically placed plate 212. A PCB board 22 is mounted on the horizontally placed plate 211, as shown. Figure 5As shown, the arc-shaped reflector 24 includes a first vertical connecting part 241 at the bottom, an arc-shaped reflector 242 at the middle, and a second vertical connecting part 243 at the top. The first vertical connecting part 241 is fixedly connected to the vertical plate 212. The arc-shaped reflector 242 has an outwardly convex curved surface facing the tri-color LED beads 25, which is used to uniformly reflect light.

[0043] The first light-emitting component 51 and the second light-emitting component 52 also include a side plate 26 mounted on the upper part of the arc-shaped reflector 24; the side plate 26 is also L-shaped; the lower part of the side plate 26 is connected to the vertical plate 212, and the upper part is fixedly connected to the second vertical connecting part 243; the side plate 26 and the second vertical connecting part 243 are fastened together by screws to form a stable support structure. The side plate 26 is formed by multiple vertical bending of sheet metal parts, which has high structural strength, low cost, and is easy to mass-produce.

[0044] For heat dissipation and overall aesthetic purposes, the side plate 26 is bent into an L-shape, forming a cavity 27 with the base plate 21 and the arc-shaped reflector 24. The cavity 27 contains air, and the side plate 26 also has several vents 28, each equipped with a cooling fan. These cooling fans exchange air between the cavity 27 and the outside air. The cooling fan automatically adjusts its speed based on the internal temperature for efficient heat dissipation. When the internal temperature rises, the temperature control module triggers the cooling fan to start, and the speed dynamically adjusts with the temperature increase to ensure stable light output from the LED beads under continuous high-frequency operation, preventing color decay or reduced lifespan due to overheating.

[0045] like Figure 1 and Figure 2 As shown, the end plate 6 is installed inside the side plate 26 to seal the cavity 27; both ends of the end plate 6 are fixedly connected to the vertical plate 212, and the side is fixedly connected to the side plate 26, which effectively prevents dust from entering the cavity 27 and ensures the cleanliness of the optical components.

[0046] The first light-emitting component 51 and the second light-emitting component 52 also include a power cord, which passes sequentially through the side plate 26 and the vertical plate 212, and is electrically connected to the PCB board 22 at its end, driving the light source control module to send a light-emitting signal to the tri-color LED beads 25, causing the tri-color LED beads 25 to emit light; Figure 6As shown, the inner side of the end plate 6 is provided with a groove 61, which is used to store and fix the power cord, realizing the connection of power and signal of the PCB boards 22 on the left and right sides, and ensuring neat wiring. In order to electrically connect with the internal PCB board 22, the side plate 26 is equipped with several connection terminals 29 for connecting the power cord. The connection terminals 29 and the power cord are reliably connected by plugging and threading, ensuring that they will not loosen under vibration or long-term operation conditions, and improving the stability and safety of the electrical connection. The connection terminals 29 are reasonably arranged, which facilitates quick assembly and maintenance, and also has waterproof and dustproof functions, adapting to complex use environments.

[0047] The light source body 1, combined with the control software, can realize the dimming of the three colors of light and the judgment output of whether the printed matter 9 is qualified;

[0048] The light source body 1 uses tri-color LED beads 25, which are controlled by the time-division control unit inside the light source control module. According to the preset frequency, the red LED bead 251, green LED bead 252 and blue LED bead 253 are lit sequentially to emit R (red 620nm), G (green 530nm) and B (blue 450nm) three-color light sources in sequence, realizing the cyclic time-division illumination of red, green and blue three-color light; the preset frequency is adjusted according to the detection speed requirements and can be 500-2000Hz.

[0049] The control software is connected to the analysis and judgment system 7 and communicates with a common grayscale line scan camera. The control software logic includes:

[0050] Grayscale data acquisition module: Synchronize the time-division lighting rhythm of the light source. When the red LED 251, green LED 252 and blue LED 253 are lit respectively, control the grayscale line scan camera to collect the grayscale images of the corresponding channels to obtain the red light grayscale image, green light grayscale image and blue light grayscale image.

[0051] Color synthesis module: It uses a numerical synthesis algorithm to synthesize color pixel values ​​by combining the pixel values ​​of red grayscale image, green grayscale image and blue grayscale image according to a preset formula;

[0052] The red light value of a color pixel = the grayscale value of the corresponding pixel in the red light grayscale image × the red light correction coefficient.

[0053] The green light value of a colored pixel = the grayscale value of the corresponding pixel in the green light grayscale image × the green light correction coefficient.

[0054] The blue light value of a color pixel = the grayscale value of the corresponding pixel in the blue light grayscale image × the blue light correction factor.

[0055] The correction coefficients are preset based on the spectral characteristics of the light source, ultimately generating a color detection image that highly matches the actual color of the printed material 9.

[0056] The time-sharing control unit is triggered according to a time sequence:

[0057] T1: Red LED 251 lit (t=0.5-2ms) → Red light grayscale image acquired

[0058] T2: Turn on 252 green LEDs (same as before) → Collect green light grayscale image

[0059] T3: 253 blue LEDs lit (same as before) → Collect blue light grayscale image

[0060] Timing error ≤10μs (ensuring row alignment accuracy)

[0061] Image synthesis algorithm:

[0062] def synthesize_image(R_gray, G_gray, B_gray):

[0063] # Channel registration (compensating for conveyor belt displacement)

[0064] B_gray = shift_matrix(B_gray, dx=Δx, dy=0)

[0065] G_gray = shift_matrix(G_gray, dx=Δy, dy=0)

[0066] # Color Reconstruction (Establishing a Grayscale-Color Mapping Model)

[0067] R_channel = k1 * R_gray + c1 # k1, c1 are calibration parameters

[0068] G_channel = k2 * G_gray² + c2 # Quadratic term compensation for nonlinearity

[0069] B_channel = k3 * log(B_gray) + c3

[0070] return merge_RGB(R_channel, G_channel, B_channel)

[0071] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0072] 1. This utility model uses a light source body 1 in conjunction with a common grayscale line scan camera to achieve high color reproduction of the printed matter 9. It is controlled by a time-division control unit to sequentially illuminate the red LED 251, green LED 252 and blue LED 253 for illumination and precise grayscale synthesis, directly obtaining the true red, green and blue three-channel color information, avoiding the color mapping deviation of the pseudo-color line scan camera, and the detail image is free of impurities. The color reproduction is better than the existing pseudo-color line scan camera solution and is close to the effect of a true color camera.

[0073] 2. This utility model has low cost and small size: it only needs to be paired with an ordinary grayscale line scan camera, and the cost is 1 / 3 to 1 / 2 of that of a true color camera. The size is comparable to that of a pseudo-color line scan camera, which greatly reduces the equipment procurement cost and reduces the overall size of the detection system, making it suitable for narrow installation spaces.

[0074] 3. This utility model has strong compatibility: the time-division frequency and synthesis algorithm parameters are adjustable, adapting to different detection speeds, such as high-speed printing production lines, and different types of printed materials, such as paper and plastic printed materials, with a wide range of applications.

[0075] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

Claims

1. A three-color time-division tunneling light source, characterized in that: The light source includes a light source body (1), a printed matter (9) is provided at the lower part of the light source body (1), the printed matter (9) moves relative to the light source body (1), a camera (8) is provided at the upper part of the light source body (1), and the camera (8) is also connected to an analysis and judgment system (7) for processing the image information detected by the camera (8); the light source body (1) includes a first light-emitting component (51) installed on one side and a second light-emitting component (52) installed on the other side, the first light-emitting component (51) and the second light-emitting component (52) are arranged side by side, a light outlet (23) is provided at the lower part, and a light receiving port (3) is provided at the upper part; the first light-emitting component (51) and the second light-emitting component (52) alternately emit red, green and blue light through the light outlet (23), the light shines on the printed matter (9), and after being reflected by the printed matter (9), it passes through the light receiving port (3) and enters the camera (8).

2. The three-color time-division tunneling light source according to claim 1, characterized in that: The first light-emitting component (51) and the second light-emitting component (52) are set independently and together form the light source body (1).

3. A three-color time-division tunneling light source according to claim 1, characterized in that: Both ends of the first light-emitting component (51) and the second light-emitting component (52) are provided with end plates (6). One end of the end plate (6) is connected to the first light-emitting component (51), and the other end is connected to the second light-emitting component (52). The first light-emitting component (51), the second light-emitting component (52) and the end plate (6) are connected together to form the light source body (1).

4. A three-color time-division tunneling light source according to claim 3, characterized in that: The first light-emitting component (51) and the second light-emitting component (52) emit light downwards at an angle. The first light-emitting component (51) and the second light-emitting component (52) are symmetrically arranged to concentrate the light emitted by the first light-emitting component (51) and the second light-emitting component (52), and both light-emitting components irradiate the printed matter (9) through the light emission outlet (23).

5. A three-color time-division tunneling light source according to claim 4, characterized in that: The first light-emitting component (51) and the second light-emitting component (52) both include a base plate (21) installed at the bottom. A PCB board (22) is provided on the base plate (21). A plurality of tri-color LED beads (25) are installed on the PCB board (22). An arc-shaped reflector (24) is installed on the upper part of the tri-color LED beads (25). The tri-color LED beads (25) emit light upwards, which is reflected by the arc-shaped reflector (24) and then shines on the printed matter (9) through the light outlet (23).

6. A three-color time-division tunneling light source according to claim 5, characterized in that: The tri-color LED (25) includes a red LED (251), a green LED (252), and a blue LED (253). The tri-color LED (25) is electrically connected to a light source control module. The light source control module has a built-in time-division control unit that controls the tri-color LED (25) to alternately output red, green, and blue light. According to a preset frequency, the red LED (251), green LED (252), and blue LED (253) are lit sequentially to achieve cyclic time-division lighting of red, green, and blue light.

7. A three-color time-division tunneling light source according to claim 6, characterized in that: The camera (8) is a grayscale line scan camera. The grayscale line scan camera collects grayscale images of the printed matter (9) under red, green and blue monochromatic light at different time periods, and then combines the three sets of images into a full-color image to achieve true color reproduction.

8. A three-color time-division tunneling light source according to claim 6, characterized in that: The base plate (21) is L-shaped and includes a horizontal plate (211) and a vertical plate (212). A PCB board (22) is mounted on the horizontal plate (211). The vertical plate (212) is connected to one side of the arc-shaped reflector (24). The first light-emitting component (51) and the second light-emitting component (52) also include a side plate (26) mounted on the upper part of the arc-shaped reflector (24). The side plate (26) is also L-shaped. The lower part of the side plate (26) is connected to the vertical plate (212), and the upper part is connected to the other side of the arc-shaped reflector (24). The side plate (26) and the arc-shaped reflector (24) form a cavity (27). The side plate (26) is also provided with several ventilation holes (28). A cooling fan is installed on the ventilation holes (28). The cooling fan exchanges the air in the cavity (27) with the outside air.

9. A three-color time-division tunneling light source according to claim 8, characterized in that: The end plate (6) is installed inside the side plate (26) to seal the cavity (27); both ends of the end plate (6) are fixedly connected to the vertical plate (212), and the side is fixedly connected to the side plate (26).

10. A three-color time-division tunneling light source according to claim 8, characterized in that: The first light-emitting component (51) and the second light-emitting component (52) also include a power cord. The power cord passes through the side plate (26) and the vertical plate (212) in sequence, and its end is electrically connected to the PCB board (22). It drives the light source control module to send a light-emitting signal to the tri-color LED (25), so that the tri-color LED (25) emits light. The side plate (26) is equipped with several connection terminals (29) for connecting the power cord.

Images