Multi-light-source integrated visual inspection system

Abstract

The invention discloses a multi-light-source integrated visual inspection system, which comprises an imaging unit, a first light source, a semi-transparent and semi-reflecting mirror, a second light source and a prism, and is characterized in that the imaging unit is provided with an optical axis; the first light source and the imaging unit are oppositely arranged along an optical axis; the semi-transparent and semi-reflective mirror is obliquely arranged between the imaging unit and the first light source; the second light source is arranged on one side of the optical axis, and emergent light is perpendicular to the optical axis; the prism is arranged on the other side of the optical axis; wherein light emitted by the first light source is propagated in the direction of the optical axis and penetrates through the semi-transparent and semi-reflecting mirror, light emitted by the second light source is propagated along the emergent optical axis of the semi-transparent and semi-reflecting mirror, and the light emitted by the first light source and the light emitted by the second light source intersect on the inclined front side of the semi-transparent and semi-reflecting mirror to define a light field center for placing an object to be measured; the semi-transparent and semi-reflective mirror is configured to receive reflected light from an object to be measured and reflect the reflected light to the imaging unit; the prism is configured to receive lateral light from the to-be-detected object and reflect the lateral light to the imaging unit, and the detection precision and the detection efficiency can be improved.

Description

Technical Field

[0001] This invention relates to the field of light source detection device technology, and in particular to a multi-light source integrated visual inspection system. Background Technology

[0002] In the field of automated visual inspection of medical syringe needles, it is necessary to simultaneously achieve high-precision measurement of contour dimensions and 100% detection of defects such as micron-level burrs and chipping at the needle tip. Existing technologies have significant bottlenecks: multi-station inspection solutions employ multiple cameras and independent light sources, resulting in bulky and costly equipment; furthermore, the cumulative errors in positioning and image registration affect accuracy, making it difficult to meet high-speed inspection requirements. While single-station time-sharing illumination solutions save costs, multiple exposures lengthen inspection time, hindering production line acceleration. Composite optical path integration solutions suffer from optical path interference and uneven illumination, and system stability depends on complex calibration, making them susceptible to environmental influences and resulting in low reliability. Therefore, there is currently a lack of an integrated optical system that can achieve highly integrated multi-modal illumination and ensure optimal workpiece positioning. Summary of the Invention

[0003] This application provides a multi-source integrated visual inspection system that can improve inspection accuracy and efficiency.

[0004] This application provides a multi-source integrated visual inspection system, including an imaging unit, a first light source, a semi-transparent mirror, a second light source, and a prism. The imaging unit has an optical axis; the first light source and the imaging unit are disposed opposite each other along the optical axis; the semi-transparent mirror is tilted on the optical axis with its reflective surface facing the imaging unit and is located between the imaging unit and the first light source; the second light source is disposed on one side of the optical axis, and the propagation direction of its emitted light is perpendicular to the optical axis; the prism is disposed on the other side of the optical axis; wherein, the light emitted by the first light source propagates along the direction of the optical axis and passes through the semi-transparent mirror, and the light emitted by the second light source propagates along its outgoing optical axis, and the two converge on the tilted front side of the semi-transparent mirror, jointly defining a center of light field for placing an object to be tested; the semi-transparent mirror is configured to receive reflected light from the object to be tested placed at the center of the light field and reflect the light to the imaging unit; the prism is configured to receive lateral light from the object to be tested placed at the center of the light field and reflect the light directly to the imaging unit.

[0005] In some embodiments, a third light source is further included, disposed above the semi-transparent mirror; wherein the emitted light from the third light source passes through the semi-transparent mirror and points towards the center of the light field.

[0006] In some embodiments, the propagation direction of the emitted light from the third light source is perpendicular to the optical axis.

[0007] In some embodiments, the angle of inclination between the semi-transparent mirror and the horizontal plane is 45°.

[0008] In some embodiments, a plane parallel to the optical axis and perpendicular to the horizontal plane is defined as a reference plane; the angle between the reflecting surface of the prism and the reference plane is not less than 25° and not greater than 75°.

[0009] In some embodiments, a control unit is further included, which is communicatively connected to the imaging unit, the first light source, and the second light source, and is configured to control the first light source and the second light source to be illuminated in a time-sharing manner, and to synchronize with the exposure operation of the imaging unit.

[0010] In some embodiments, it further includes: a housing assembly having a receiving cavity formed therein;

[0011] The imaging unit, the first light source, the second light source, the prism, and the semi-transparent and semi-reflective mirror are all disposed within the receiving cavity;

[0012] The housing has a detection inlet that communicates with the receiving cavity. The detection inlet is located at the center of the light field and is used for the object to be tested to extend into it.

[0013] In some embodiments, the system further includes: a ring light source detachably connected to the housing assembly for emitting ultraviolet light; the ring light source having a central through-hole aligned with the detection inlet; the object under test located in the light emission direction of the ring light source; and the semi-transparent mirror capable of reflecting the imaging light reflected by the object under test to the imaging unit.

[0014] In some embodiments, the ring light source is magnetically connected to the housing assembly.

[0015] In some embodiments, the annular light source further includes a sealing cover plate, which closes the central through hole;

[0016] When the ring light source is connected to the housing assembly, the sealing cover is used to close the detection inlet.

[0017] In this embodiment, by orthogonally arranging the first and second light sources and integrating the optical paths of the semi-transparent mirror and prism, a high degree of integration of the physical space and optical level of multimodal illumination is achieved. Multi-directional light information can be simultaneously acquired without switching detection stations. Compared to existing multi-station detection schemes, this significantly reduces equipment size, avoids the accumulation of positioning and image registration errors between stations, and improves detection accuracy. The object under test is located at the center of the light field where the first and second light sources intersect, ensuring consistent light intensity received by all sides of the glue needle tip. This solves problems such as stray light interference and inconsistent detection sensitivity caused by the workpiece deviating from its optimal position in existing composite optical path schemes, effectively avoiding missed detection of needle tip burrs or false alarms for normal structures. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a multi-light source integrated visual inspection system provided in an embodiment of this application;

[0020] Figure 2 This is a first cross-sectional schematic diagram of a multi-light source integrated visual inspection system provided in an embodiment of this application;

[0021] Figure 3 This is a second cross-sectional schematic diagram of a multi-light source integrated visual inspection system provided in an embodiment of this application;

[0022] Figure 4 This is a third cross-sectional schematic diagram of a multi-light source integrated visual inspection system provided in an embodiment of this application;

[0023] Figure 5 This is a schematic diagram of the structure of a multi-light source integrated visual inspection system provided in an embodiment of this application (some housing components are omitted).

[0024] Explanation of icon numbers:

[0025] 1. Multi-light source integrated visual inspection system; 10. Imaging unit; 11. Camera; 12. Lens; 20. First light source; 30. Semi-transparent mirror; 40. Second light source; 50. Prism; 60. Third light source; 70. Housing assembly; 71. Receiving cavity; 72. Detection entrance; 73. Bottom shell; 74. Top cover; 75. Light source fixing plate; 76. Prism fixing plate; 77. Semi-transparent mirror mounting plate; 80. Ring light source; 81. Central through hole; 82. Sealing cover plate; 90. Object to be measured.

[0026] The realization of the objective, functional characteristics and advantages of the present invention will be further explained with reference to the accompanying drawings and embodiments. Detailed Implementation

[0027] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0028] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0029] In the field of automated visual inspection of medical syringe needles, the core requirements are to simultaneously achieve high-precision measurement of contour dimensions and 100% detection of surface defects such as micron-level burrs and chipping at the needle tip, while also meeting the cycle time requirements of high-speed online inspection. Existing technical solutions struggle to balance efficiency, accuracy, and stability, exhibiting multiple bottlenecks: First, multi-station inspection solutions utilize multiple cameras and independent light sources to perform dimensional measurements and defect detection at different stations, resulting in bulky and costly equipment. Furthermore, the accumulated positioning and image registration errors between stations negatively impact the final judgment accuracy, making them unsuitable for high-speed production lines. Second, while single-station time-sharing illumination solutions save costs by using a single camera, they require switching between at least two orthogonal low-angle light directions to cover the entire circumference of the needle tip. Multiple exposures significantly lengthen the inspection time for a single piece, becoming a bottleneck for production line speed-up. Third, existing composite optical path integration solutions neglect the optimal spatial position of the workpiece, leading to optical path interference and uneven illumination, causing missed detections and false alarms. Moreover, solutions relying on plane mirrors to construct optical paths are space-consuming, complex to adjust, prone to inaccuracies due to environmental vibrations, require frequent maintenance, and have low reliability.

[0030] Based on this, this application provides a multi-light source integrated visual inspection system 1. Please refer to [link / reference]. Figures 1 to 5 The system includes an imaging unit 10, a first light source 20, a semi-transparent mirror 30, a second light source 40, and a prism 50.

[0031] The imaging unit 10 has an optical axis for image acquisition and transmission. The imaging unit 10 can include a camera 11 and a lens 12. Specifically, it can be an industrial CMOS camera 11 equipped with a high-definition microscope lens 12. The camera 11 housing is made of aluminum alloy, which is both lightweight and anti-interference, and is suitable for the complex environment of industrial production lines.

[0032] The first light source 20 and the imaging unit 10 are arranged opposite each other along the aforementioned optical axis, and the light emitted by the first light source 20 is parallel to the optical axis; wherein, the first light source 20 can be a high-brightness LED array light source, and the LED beads contained therein are all designed to emit light at a low angle, that is, the light emission angle of the first light source 20 can be less than 60°.

[0033] The semi-transparent mirror 30 is tilted on the optical axis with its reflective surface facing the imaging unit 10 and located between the imaging unit 10 and the first light source 20. Preferably, the tilt angle between the semi-transparent mirror 30 and the horizontal plane is 45°, which can ensure efficient transmission and reflection of light. The semi-transparent mirror 30 can be made of K9 optical glass substrate with multiple layers of anti-reflective and reflective coatings on the surface, which can effectively reduce light loss and improve image contrast. At the same time, the glass substrate has high hardness, strong scratch resistance, and extended service life. Of course, the semi-transparent mirror 30 can also be made of optical grade resin, such as, but not limited to, PMMA, PC, ZEONEX, etc. These materials are lightweight, low cost, and easy to process. This application does not impose specific restrictions on the material of the semi-transparent mirror 30.

[0034] The second light source 40 is located on one side of the optical axis, and the propagation direction of its emitted light is perpendicular to the optical axis, forming an orthogonal illumination structure. The second light source 40 has the same structure as the first light source 20, and is also a low-angle LED array light source. Thus, the light intensity and light angle of the first light source 20 and the second light source 40 have good consistency.

[0035] Prism 50 is positioned on the other side of the optical axis. This prism 50 can be an isosceles right-angled triangular prism 50, with a substrate of K9 optical glass and a precision-polished surface to ensure accurate light reflection. A plane parallel to the optical axis and perpendicular to the horizontal plane is defined as the reference plane. The angle between the reflecting surface of prism 50 and this reference plane is not less than 25° and not more than 75°, preferably 45°, to ensure accurate reflection and convergence of lateral light rays.

[0036] Please refer to the following: Figures 2 to 4The light propagation path is as follows: low-angle light emitted from the first light source 20 propagates along the optical axis and passes through the semi-transparent mirror 30; low-angle light emitted from the second light source 40 propagates along its own exit direction. The two light sources converge at the inclined front side of the semi-transparent mirror 30, jointly defining a center of the light field for placing the medical syringe needle tip under test. The semi-transparent mirror 30 is configured to receive reflected light from the object under test 90 at the center of the light field and reflect it to the imaging unit 10. The prism 50 is configured to receive lateral light from the object under test 90 at the center of the light field and reflect it directly to the imaging unit 10, achieving convergence imaging of multi-directional light. It is worth noting that the orthogonal arrangement of the first light source 20 and the second light source 40 ensures that each direction of the needle tip circumference receives optimal low-angle illumination with similar incident angles from at least one light source, providing a guarantee for circumferential defect detection.

[0037] This embodiment is applicable to basic testing scenarios in medium-to-high-speed medical syringe needle production lines, enabling simultaneous detection of needle contour dimensions and circumferential surface defects. The light source can be used in two modes: single application and combined application. Specific effects are as follows:

[0038] When the first light source 20 is turned on alone, bright-field imaging of the axial contour of the glue needle tip can be achieved, clearly capturing the length, diameter and other dimensional information of the glue needle tip, which is suitable for preliminary screening with high dimensional accuracy requirements; when the second light source 40 is turned on alone, dark-field imaging of one side of the glue needle tip can be achieved, accurately detecting micron-level burrs and chipping defects in that direction, which is suitable for special re-inspection of defects in specific directions.

[0039] When the first light source 20 and the second light source 40 are simultaneously activated, the contour size information of the glue needle and the full circumferential defect information can be collected simultaneously through orthogonal low-angle illumination and optical path integration. There is no need to switch workstations or adjust the light source angle. The single-piece inspection time is ≤10ms, which meets the cycle time requirements of high-speed production lines (capacity ≥600 pieces / minute). Compared with single light source detection, combined use can avoid the missed defects caused by single-direction illumination.

[0040] It is worth noting that the multi-source integrated visual inspection system 1 of this application embodiment is not only applicable to medical syringe needles, but also to the full circumferential dimension measurement and surface defect detection of other tiny precision parts, such as: tiny needle tips of minimally invasive medical devices (such as biopsy needles and puncture needles), precision pins of electronic components, balls and raceways of micro bearings, edge contours of optical lenses, and pin terminals of semiconductor chips, etc. It is especially suitable for precision manufacturing fields with stringent requirements for detection accuracy, detection efficiency, and stability.

[0041] In this application, by orthogonally arranging the first light source 20 and the second light source 40 and integrating the optical paths of the semi-transparent mirror 30 and the prism 50, a high degree of physical and optical integration of multimodal illumination (bright field + bidirectional dark field) is achieved. Multi-directional light information can be simultaneously acquired without switching detection stations. Compared to existing multi-station detection schemes, this significantly reduces equipment size, avoids the accumulation of positioning and image registration errors between stations, and improves detection accuracy. The object under test 90 is located at the center of the light field where the light from the first light source 20 and the second light source 40 intersect, ensuring that the light intensity and angle received by each side of the glue needle are uniform (light intensity difference ≤ ±5%). This solves the problems of stray light interference and inconsistent detection sensitivity caused by the workpiece deviating from its optimal position in existing composite optical path schemes, effectively avoiding missed detection of needle tip burrs or false alarms for normal structures. The optical path is constructed by using a semi-transparent and semi-reflective mirror 30 and a prism 50 at a fixed angle, which replaces multiple discrete plane mirror components in the existing technology. The direction of the optical path is guaranteed by the physical geometry of the components, which has strong vibration resistance, eliminates the need for frequent precision adjustments, reduces maintenance costs, and improves the stability of system operation.

[0042] Please see Figures 2 to 5 In some embodiments, the system further includes a third light source 60, which is positioned above the semi-transparent mirror 30. Its emitted light rays pass through the semi-transparent mirror 30 and point towards the center of the light field. Preferably, the propagation direction of the emitted light rays from the third light source 60 is perpendicular to the optical axis. This further enriches the illumination modes. The emitted light rays, after passing through the semi-transparent mirror 30, precisely point towards the glue needle under test at the center of the light field. This allows for the acquisition of optical information from the top and circumferential areas of the glue needle not covered by the first and second light sources 40, achieving full circumferential and all-around detection coverage of the glue needle. This is particularly suitable for scenarios requiring higher accuracy in contour dimension measurement.

[0043] Based on the above embodiments, in order to clarify the spatial layout of each component, a spatial rectangular coordinate system is defined with the center of the light field as the origin: the imaging unit 10 and the first light source 20 are both located on the X-axis and are located on both sides of the center of the light field respectively; the second light source 40 and the prism 50 are located on the Y-axis and are located on both sides of the center of the light field respectively; the third light source 60 and the detection entrance 72 are located on the Z-axis and are located on both sides of the center of the light field respectively.

[0044] This embodiment optimizes the modular structure design of the first light source 20, the second light source 40, and the third light source 60: each of the three light sources includes a base plate, four side plates, an LED circuit board, and a diffuser plate. The base plate is made of aluminum alloy with a thickness of 5mm, providing good load-bearing and heat dissipation performance. The four side plates, also made of aluminum alloy, are bolted to the edges of the base plate and positioned around the LED circuit board to form mounting grooves. The LED circuit board is attached to the base plate, with thermally conductive silicone used to enhance heat dissipation. The diffuser plate is fixed to the four side plates and covers the mounting grooves. This modular structure effectively protects the LED circuit board from dust and moisture contamination, and also homogenizes the light from the LED circuit board, avoiding light spots and shadows caused by direct light, thus improving lighting uniformity.

[0045] When the third light source 60 is activated alone, dark-field imaging can be achieved on the top and the other circumferential side of the glue needle tip, detecting burrs and chipping defects on the top that are not covered by the first light source 20 and the second light source 40. This is suitable for specialized inspection of defects on the top of the glue needle tip. When the first light source 20 and the third light source 60, or the second light source 40 and the third light source 60, or the first light source 20, the second light source 40 and the third light source 60 are activated simultaneously, every area of ​​the circumference and top of the glue needle tip can obtain uniform illumination, allowing for the acquisition of clearer and more comprehensive image information. This not only further improves the accuracy of contour dimension measurement but also detects smaller defects, making it suitable for the stringent quality inspection requirements of high-end medical consumables. Specifically, activating the first light source 20 and the third light source 60, or the second light source 40 and the third light source 60 simultaneously, can specifically enhance the detection accuracy of specific circumferential areas; activating all three light sources simultaneously can achieve 360° all-around detection without blind spots, ensuring comprehensive detection.

[0046] In some embodiments, the system further includes a control unit, which can be an industrial-grade PLC controller with high reliability and fast response capabilities. The control unit communicates with the imaging unit 10, the first light source 20, the second light source 40, and the third light source 60 through various communication methods, such as using transmission wires (e.g., shielded signal cables) or Bluetooth wireless communication. When using transmission wires, the signal transmission stability is higher, the anti-electromagnetic interference capability is stronger, and it is suitable for the complex electromagnetic environment of industrial production lines. When using Bluetooth communication, wireless connection between the control unit and each component can be realized, reducing cable layout, improving system installation flexibility, and adapting to scenarios with limited space or where frequent adjustment of component positions is required. The core functions of the control unit include: first, controlling the first light source 20, the second light source 40, and the third light source 60 to achieve millisecond-level time-division lighting and precisely synchronizing with the exposure action of the imaging unit 10; second, being able to preset multiple light source combination lighting modes, such as simultaneous lighting of the first light source 20 and the second light source 40, simultaneous lighting of the first light source 20 and the third light source 60, simultaneous lighting of the three light sources, and time-division cyclic lighting of the three light sources, which users can switch according to different detection needs; and third, having a light source brightness adjustment function, which can precisely adjust the light intensity of each light source according to the material and size differences of the probe tip to be tested, ensuring optimal imaging effect.

[0047] Specifically, a three-light source time-sharing illumination mode is adopted, which, together with the imaging unit 10, completes exposure and acquisition simultaneously. This avoids optical path interference caused by the simultaneous illumination of different light sources and minimizes the inspection time of a single item. Compared with the existing single-station time-sharing illumination scheme, the inspection efficiency is improved by more than 2 times, which can perfectly match the cycle requirements of high-speed online inspection.

[0048] When the production line switches to different specifications of medical syringe needles, the corresponding light source combination mode and brightness parameters can be quickly switched through the parameter template preset by the control unit. There is no need to manually adjust the position and angle of the light source, which greatly improves the flexible production capability of the production line.

[0049] Please see Figures 2 to 5 In some embodiments, the system further includes a housing assembly 70, which has an internal receiving cavity 71. Specifically, the housing assembly 70 may include a bottom shell 73, a top cover 74, a light source fixing plate 75, a prism fixing plate 76, and a semi-transparent, semi-reflective mirror mounting plate 77. Both the bottom shell 73 and the top cover 74 are made of high-strength ABS engineering plastic and have been treated with anti-static agents. The bottom shell 73 has a rectangular shell structure with an opening at the top, and a detection inlet 72 communicating with the receiving cavity 71 is provided at the front end of its bottom. The detection inlet 72 is located at the center of the light field and is used for inserting the needle of the medical syringe to be tested. The top cover 74 is connected to the top of the bottom shell 73 by a combination of buckles and bolts, together forming a sealed receiving cavity 71 with an IP54 protection level, which can effectively isolate external dust and moisture.

[0050] Multiple light source fixing plates 75 can be installed, all made of aluminum alloy and fixed to the inside of the base shell 73 with bolts. One light source fixing plate 75 can be used to fix the base plate of the first light source 20 and the side plate of the third light source 60, and another can be used to fix the base plate of the second light source 40 and the side plate of the third light source 60, ensuring the relative position accuracy of the three light sources and ensuring the accuracy of the lighting angle.

[0051] The prism mounting plate 76 can be made of metal or plastic, and includes a first plate and a second plate. The first plate is vertically fixed to the middle of the second plate, forming an "L" shape. The right-angled facet of the prism 50 is attached to the first and second plates with thermally conductive silicone to ensure that the prism 50 is firmly installed and has good heat dissipation. In addition, the second plate is also connected to the side plate of the third light source 60 by bolts to achieve relative fixation between the prism 50 and the light source, further improving the structural stability of the system.

[0052] The semi-transparent mirror mounting plate 77 can be made of aluminum alloy and there are two of them, symmetrically fixed inside the bottom shell 73. The opposite sides of the two mounting plates are provided with mounting grooves that match the thickness of the semi-transparent mirror 30. The edge of the semi-transparent mirror 30 is embedded and fixed in the mounting groove, which can precisely ensure that the semi-transparent mirror 30 is tilted at a 45° angle to the horizontal plane. The mounting plates are fixed by bolts to the third light source 60, the second light source 40 and the prism fixing plate 76, realizing the integrated linkage of the components.

[0053] Imaging unit 10, first light source 20, second light source 40, third light source 60, prism 50 and semi-transparent mirror 30 are all integrated in the above-mentioned receiving cavity 71, and each component is precisely positioned and fixed by a corresponding fixing plate.

[0054] Please see Figures 1 to 4 In some embodiments, a ring light source 80 is also included, which is detachably connected to the housing assembly 70 for emitting ultraviolet light. The ring light source 80 includes a ring housing, ultraviolet LED beads, and a sealing cover plate 82. The ring housing is made of aluminum alloy with an anodized surface, providing good heat dissipation performance. The ultraviolet LED beads are evenly distributed on the inner side of the ring housing, emitting ultraviolet light with a wavelength of 365nm and an emission angle of 20°, which can achieve uniform ultraviolet irradiation of the glue needle tip. The sealing cover plate 82 can be made of transparent acrylic material and is fixed to the outer side of the ring housing, sealing the central through hole 81 of the ring light source 80.

[0055] The central through-hole 81 of the ring light source 80 is aligned with the detection inlet 72 of the housing. The needle tip of the medical syringe under test is located in the light emission direction of the ring light source 80, ensuring that ultraviolet light can accurately irradiate the surface of the needle tip. The semi-transparent mirror 30 can reflect the ultraviolet imaging light reflected by the object under test 90 to the imaging unit 10 to achieve ultraviolet fluorescence imaging. When the ring light source 80 is connected to the housing assembly 70, the sealing cover 82 can simultaneously close the detection inlet 72 to achieve sealed protection of the receiving cavity 71. After disassembly, the detection inlet 72 can be opened normally without affecting the normal detection function.

[0056] The addition of the ring light source 80 enables the system to perform additional functions beyond the original contour dimensional measurement and surface defect detection, including specific contaminant detection, adhesive residue detection, and material identification. This adapts to the detection needs of more medical syringe needles, improving the system's versatility. Specifically, when oil, dust, or other contaminants remain on the surface of the needle, they will emit fluorescence of a specific wavelength under ultraviolet light. The imaging unit 10 collects the fluorescence image, allowing for rapid and accurate detection of the contaminants, ensuring the sterility and safety of the syringe. During syringe assembly, if adhesive residue remains at the junction of the needle and syringe barrel, it will exhibit a clear fluorescence signal under ultraviolet light, which can be quickly detected by this system, preventing adhesive residue from affecting the syringe's sealing and performance. Different needle materials exhibit different fluorescence characteristics under ultraviolet light. The fluorescence image collected by this system allows for rapid identification of whether the needle material meets requirements, avoiding quality problems caused by material confusion.

[0057] In some embodiments, the annular housing is detachably connected to the housing assembly 70 via a magnetic connection. This simplifies the manufacturing process and allows for quick installation or disassembly according to testing requirements without altering the core optical path or housing structure. This enables flexible switching between conventional and ultraviolet detection functions and reduces the equipment investment cost for multi-functional detection.

[0058] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-source integrated visual inspection system (1), characterized in that, include: The imaging unit (10) has an optical axis; The first light source (20) is disposed opposite to the imaging unit (10) along the optical axis; A semi-transparent and semi-reflective mirror (30) is inclined on the optical axis with its reflective surface facing the imaging unit (10) and located between the imaging unit (10) and the first light source (20); The second light source (40) is disposed on one side of the optical axis, and the propagation direction of its emitted light is perpendicular to the optical axis; as well as A prism (50) is disposed on the other side of the optical axis; The light emitted by the first light source (20) propagates along the direction of the optical axis and passes through the semi-transparent mirror (30), while the light emitted by the second light source (40) propagates along its outgoing optical axis. The two light sources converge on the inclined front side of the semi-transparent mirror (30) and together define a center of light field for placing the object to be measured. The semi-transparent mirror (30) is configured to receive reflected light from the object to be measured placed at the center of the light field and reflect the light to the imaging unit (10). The prism (50) is configured to receive lateral light rays from the object to be measured placed at the center of the light field and reflect the light rays to the imaging unit (10).

2. The multi-source integrated visual inspection system (1) as described in claim 1, characterized in that, It also includes a third light source (60), which is positioned above the semi-transparent and semi-reflective mirror (30); The emitted light from the third light source (60) passes through the semi-transparent mirror (30) and points towards the center of the light field.

3. The multi-source integrated visual inspection system (1) as described in claim 2, characterized in that, The propagation direction of the emitted light from the third light source (60) is perpendicular to the optical axis.

4. The multi-source integrated visual inspection system (1) as described in claim 1, characterized in that, The angle of inclination between the semi-transparent and semi-reflective mirror (30) and the horizontal plane is 45°.

5. The multi-source integrated visual inspection system (1) as described in claim 1, characterized in that, A plane parallel to the optical axis and perpendicular to the horizontal plane is defined as a reference plane; the angle between the reflecting surface of the prism (50) and the reference plane is not less than 25° and not greater than 75°.

6. The multi-source integrated visual inspection system (1) as described in claim 1, characterized in that, It also includes a control unit, which is communicatively connected to the imaging unit (10), the first light source (20) and the second light source (40), and is configured to control the first light source (20) and the second light source (40) to be lit in a time-sharing manner and synchronized with the exposure action of the imaging unit (10).

7. The multi-source integrated visual inspection system (1) as described in any one of claims 1 to 6, characterized in that, Also includes: The housing assembly (70) has an internal cavity (71). The imaging unit (10), the first light source (20), the second light source (40), the prism (50), and the semi-transparent and semi-reflective mirror (30) are all disposed within the receiving cavity (71); The housing has a detection inlet (72) that communicates with the receiving cavity (71). The detection inlet (72) is set at the center of the light field and is used for the object to be tested to extend into it.

8. The multi-source integrated visual inspection system (1) as described in claim 7, characterized in that, Also includes: A ring light source (80) is detachably connected to the housing assembly (70) for emitting ultraviolet light. The ring light source (80) has a central through hole (81) which is aligned with the detection inlet (72). The object to be tested is located in the light emission direction of the ring light source (80). The semi-transparent mirror (30) can reflect the imaging light reflected by the object to be tested to the imaging unit (10).

9. The multi-source integrated visual inspection system (1) as described in claim 8, characterized in that, The ring light source (80) is magnetically connected to the housing assembly (70).

10. The multi-source integrated visual inspection system (1) as described in claim 9, characterized in that, The ring light source (80) also includes a sealing cover plate (82), which closes the central through hole (81). When the ring light source (80) is connected to the housing assembly (70), the sealing cover (82) is used to close the detection inlet (72).

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