A light source and optical inspection apparatus for automated optical inspection

Abstract

The application discloses a light source and an optical detection device for automatic optical detection. The light source comprises a shell and a light-emitting lamp group. The inner side of the shell is sequentially provided with a first mounting layer, a second mounting layer and a third mounting layer from top to bottom. The light-emitting lamp group comprises first lamp beads and second lamp beads. The first mounting layer and the second mounting layer are both provided with the first lamp beads. Each of the first mounting layer, the second mounting layer and the third mounting layer is provided with the second lamp beads. The first lamp beads are UV lamp beads, and the second lamp beads are one or more of visible light lamps. The application can effectively excite fluorescent substances in UV glue by adding multiple UV light channels to enhance UV light energy, thereby improving detection efficiency and precision.

Description

Technical Field

[0001] This application relates to the technical field of light sources, and more particularly to a light source and optical inspection equipment for automatic optical inspection. Background Technology

[0002] Optical inspection equipment can detect various surface defects on test objects. For example, when inspecting adhesive coatings, the light source structure includes a UV lamp. This lamp illuminates the fluorescent substances in the adhesive, causing them to emit blue fluorescence. The intensity of this blue light is then detected by a camera to determine the coating area and integrity. However, when the UV energy of the light source is relatively low, especially when inspecting adhesives with low fluorescent substance content, the insufficient UV energy cannot fully excite the fluorescent substances. This results in weak fluorescence intensity, leading to a sparse light signal received by the camera and a dark image of the adhesive area. Ultimately, this makes it difficult to accurately identify the adhesive area, or even prevents its detection altogether, severely limiting the efficiency and accuracy of adhesive coating inspection. Utility Model Content

[0003] The purpose of this application is to provide a light source and optical inspection equipment for automatic optical inspection, which adds multiple UV light channels to enhance UV light energy, effectively excites fluorescent substances in UV adhesives, and improves inspection efficiency and accuracy.

[0004] To achieve the above objectives, this application adopts the following technical solution:

[0005] On one hand, a light source for automated optical inspection is provided, comprising: a housing and a light-emitting lamp assembly. The inner side of the housing is sequentially provided with a first mounting layer, a second mounting layer, and a third mounting layer from top to bottom. The light-emitting lamp assembly includes a first LED and a second LED. The first LED is disposed in both the first and second mounting layers, and the second LED is disposed in each of the first, second, and third mounting layers. The first LED is a UV LED, and the second LED is one or more of a visible light LED. This light source for automated optical inspection achieves multispectral collaborative detection through a layered arrangement of UV and multi-color temperature LEDs, significantly improving defect identification capabilities and detection accuracy in complex scenarios.

[0006] Furthermore, the second LED includes a red LED, a green LED, a blue LED, and a white LED. The red LED is disposed on the first mounting layer, the green LED is disposed on the second mounting layer, the blue LED is disposed on the third mounting layer, and the white LED is disposed on both the first and third mounting layers. By arranging white / red / green / blue LEDs in a layered manner to construct a multispectral detection system, the multi-angle imaging quality and defect identification capability of complex structural components are significantly improved.

[0007] Furthermore, the housing is provided with a bowl-shaped mounting cavity, within which the first mounting layer, the second mounting layer, and the third mounting layer are all located, and are arranged in a ring shape. The angle between the first mounting layer (102) and the horizontal plane is α, and the angle between the second mounting layer (103) and the horizontal plane is β, where 0 ≤ α ≤ 10°, and 40° ≤ β ≤ 50°. Through the bowl-shaped cavity and the circumferential multi-layer lamp panel design, a 360° annular light field coverage is achieved. The first mounting layer optimizes the light field distribution through a near-horizontal layout, significantly improving illumination uniformity, thereby significantly improving the multi-angle imaging uniformity and stereoscopic detection accuracy of complex structural components.

[0008] Furthermore, the first mounting layer is equipped with UV lamps, red lamps, and white lamps, which are alternately arranged on the first mounting layer. Each UV lamp is controlled to be illuminated by at least one control channel. This alternating arrangement of UV lamps and red / white lamps significantly improves multispectral collaborative detection capabilities and illumination uniformity. Moreover, the UV lamps in the first mounting layer can be controlled to be illuminated by one control channel, or by two or more control channels.

[0009] Furthermore, UV lamps and green lamps are mounted on the second mounting layer, and the UV lamps and green lamps are arranged alternately on the second mounting layer. The UV lamps are controlled to be lit by at least one control channel. The alternating arrangement of UV lamps and green lamps significantly improves the spectral uniformity of the middle layer and the multispectral collaborative detection capability.

[0010] Furthermore, each control channel of the UV lamp can be controlled independently. The UV lamp corresponding to any control channel can be illuminated according to actual needs.

[0011] Furthermore, the blue LEDs and the white LEDs are alternately arranged on the third mounting layer. This improves the uniformity of light emission in the underlying layer and ensures consistent light emission quality.

[0012] Furthermore, the LEDs on the first and second mounting layers are surface-mount LEDs. By using surface-mount LEDs, the uniformity of illumination from the light source is significantly improved, thereby enhancing the accuracy and stability of optical detection.

[0013] Furthermore, the wavelength range of the first LED bead is any one of 320nm-400nm, 280nm-320nm, and 200nm-280nm.

[0014] On the other hand, an optical inspection device is also provided, including a light source controller. The output terminal of the light source controller is electrically connected to the light source for automatic optical inspection described above through a control channel. The light source controller controls at least one UV lamp bead in the control channel to be lit simultaneously.

[0015] The beneficial effects of this application are as follows: In the UV detection dimension, the dual-layer UV lamp bead layout constructs a three-dimensional ultraviolet light field, increasing the effective irradiation energy density and completely solving the problem of low fluorescence excitation efficiency caused by insufficient energy of traditional single-layer UV light sources. When detecting adhesives with low fluorescent substance content, the superimposed energy field formed by the multi-layer UV light channels ensures that the fluorescent substance is fully excited, resulting in a qualitative improvement in the intensity of the fluorescence signal captured by the camera, effectively solving detection pain points such as dark imaging and blurred boundaries in the adhesive area. In the conventional detection dimension, the second lamp bead forms an independent and controllable visible light system. Through intelligent light mixing algorithms, it can generate detection spectra adapted to different material surfaces, meeting the appearance inspection needs of conventional components such as resistors and capacitors. It can also achieve second-level switching between UV detection mode and multi-color detection mode through layered independent control technology. This dual-mode compatible design allows a single device to cover the entire product line's inspection scenarios. While ensuring zero missed detection rate for UV adhesives, it avoids hardware redundancy between dedicated UV light sources and conventional light sources used for automatic optical inspection in traditional solutions, significantly reducing the deployment cost and maintenance complexity of production line equipment. Attached Figure Description

[0016] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a schematic diagram of the structure of the light source for automatic optical inspection described in the embodiments of this application. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the structure of the light source for automatic optical inspection described in the embodiments of this application. Figure 2 .

[0019] In the diagram: 1. Housing; 101. Mounting cavity; 102. First mounting layer; 103. Second mounting layer; 104. Third mounting layer; 2. Light-emitting lamp assembly; 201. First LED bead; 202. Second LED bead; 203. Lamp board; 2011. UV LED bead; 2021. Red LED bead; 2022. Green LED bead; 2023. Blue LED bead; 2024. White LED bead. Detailed Implementation

[0020] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] Existing solutions fail to effectively excite fluorescent materials to generate sufficient blue light signals, resulting in a significant decrease in camera image quality and insufficient contrast between the adhesive area and the background. Furthermore, the fixed tilt angle design of the top-layer UV light source forms a directional illumination cone. When detecting objects with three-dimensional structures, the upper structure blocks the UV light, preventing the lower adhesive area from receiving UV excitation and leading to missed detections of the adhesive coating area. To compensate for insufficient UV energy, existing technologies require extending the camera exposure time to obtain identifiable images, directly resulting in a significant increase in the detection cycle time and severely impacting production line efficiency. These technical shortcomings collectively lead to the core problems of existing light sources used for automated optical inspection in the field of UV adhesive detection: low detection sensitivity, poor scene adaptability, and low detection efficiency.

[0024] In response to the above problems, such as Figure 1 and Figure 2As shown, this embodiment proposes a light source for automatic optical detection, including: a housing 1 and a light-emitting lamp group 2. The inner side of the housing 1 is provided with a first mounting layer 102, a second mounting layer 103 and a third mounting layer 104 from top to bottom. The light-emitting lamp group 2 includes a first lamp bead 201 and a second lamp bead 202. The first mounting layer 102 and the second mounting layer 103 are both provided with the first lamp bead 201, and each of the first mounting layer 102, the second mounting layer 103 and the third mounting layer 104 is provided with the second lamp bead 202. The first lamp bead 201 is a UV lamp bead 2011, and the second lamp bead 202 is one or more of visible light lamps.

[0025] The light source for automated optical inspection proposed in this embodiment adopts a layered composite illumination architecture. Through UV optical path reconstruction and multispectral collaborative design, it achieves a breakthrough in detection efficiency. It is universally applicable in 2D inspection light sources and suitable for coating inspection and 2D visible light defect detection scenarios, such as solder joint defect detection, screen printing inspection, symbol detection, and component error / omission detection. In the three-layer annular structure of the housing 1, both the first mounting layer 102 and the second mounting layer 103 are equipped with first LED beads 201 (i.e., UV LED beads 2011), forming a double-layer superimposed UV light emission array to construct a three-dimensional ultraviolet light field. Furthermore, second LED beads 202 (one or more of visible light LED beads) are configured in the first mounting layer 101, the second mounting layer 102, and the third mounting layer 104, forming an independently controllable visible light system. When performing UV adhesive testing, the dual-layer UV lamp beads 2011 can be activated individually or simultaneously, and can be rationally adjusted according to specific testing needs. Utilizing a spatially staggered layout, a wide-angle energy coverage is formed, and the UV light spot creates a three-dimensional cone-shaped irradiation field in the testing area, ensuring that all points on the adhesive surface receive uniform UV excitation energy. When the testing scene has a three-dimensional obstruction structure, the upper and lower UV lights form complementary illumination, completely eliminating the blind spots of traditional light sources. In the conventional automatic optical inspection mode, the visible light lamp beads generate a detection spectrum adapted to the reflectivity of different material surfaces through an intelligent light mixing algorithm, meeting the appearance inspection requirements of components such as resistors and capacitors. Simultaneously, through layered independent control technology, the equipment can quickly switch between UV detection mode and multi-color detection mode, enabling a single light source to simultaneously possess the combined functions of UV adhesive-specific testing and conventional automatic optical inspection.

[0026] This embodiment achieves four major technological breakthroughs through innovative light source architecture: First, a leap in UV energy density. The dual-layer UV lamp bead 2011 layout increases effective irradiation power, ensuring that even adhesives with low fluorescent material content can still produce a clear and identifiable fluorescence response, completely solving the problem of dark imaging. Second, enhanced detection reliability. The three-dimensional UV light path design eliminates the irradiation blind spots of traditional solutions, achieving full coverage of the adhesive area in complex structural component inspection scenarios, significantly reducing the false negative rate. Third, the high-power, high-energy UV light source allows for shorter camera exposure times, and the camera's imaging can still meet the inspection requirements. This increases the speed of automatic optical inspection machine imaging and greatly improves the efficiency of customer production inspection. Fourth, optimized production line efficiency. The multi-spectral compatible design allows the equipment to replace the original combination of UV-dedicated light sources and conventional light sources used for automatic optical inspection. While reducing hardware costs, intelligent mode switching shortens the inspection cycle, significantly improving the quality control level and production efficiency of the production line. This solution ensures both the sensitivity of UV adhesive testing and the versatility of testing in multiple scenarios, providing an efficient and reliable solution for quality inspection in the precision manufacturing field.

[0027] Further, the second LED 202 includes a red LED 2021, a green LED 2022, and a blue LED 2023. The red LED 2021 is disposed on the first mounting layer 102, the green LED 2022 is disposed on the second mounting layer 103, and the blue LED 2023 is disposed on the third mounting layer 104. The red LED 2021, located on the top layer, can preferentially provide long-wavelength light compensation for the upper detection area. The green LED 2022 is disposed on the middle layer to match the body color characteristics of conventional components. The blue LED 2023 is deployed on the bottom layer to enhance the imaging contrast of light-colored markers. When performing multi-color detection, the control system independently adjusts the output power of each layer of LEDs according to the material characteristics of the object being tested. For example, when detecting dark resistors, the output of the top layer red light is enhanced to penetrate the oxide layer; when detecting green pads, the middle layer green light is activated to achieve body color enhancement; and when detecting white silkscreen printing, the bottom layer blue light is activated to suppress overexposure. This layered color light configuration enables the spectral energy to form a three-dimensional distribution in the spatial domain. Combined with the three-dimensional illumination architecture of the UV light path, it creates an optical environment with continuously adjustable spectral composition within the detection area, significantly improving the imaging resolution of complex material surfaces.

[0028] Furthermore, the second LED 202 also includes a white LED 2024, which is respectively disposed on the first mounting layer 102 and the third mounting layer 104. The top white LED 2024 and the bottom white LED 2024 form a light intensity superposition, creating a homogenized basic light field in the detection area, providing neutral color temperature reference illumination for conventional automatic optical inspection. When performing multi-color inspection tasks, the white light channel works in conjunction with the red / green / blue LEDs, achieving continuous adjustment of color temperature through the principle of spectral superposition: for example, when inspecting dark components, the bottom white light output is enhanced to compensate for surface light absorption characteristics, and when inspecting light-colored marks, the intensity of the top white light is reduced to avoid overexposure. In UV inspection mode, the white LED 2024 remains off to eliminate visible light interference, while in conventional inspection, it is used as the main illumination source, forming a composite optical system that combines specialized and general inspection capabilities in conjunction with the three-dimensional illumination architecture of the UV light path. This layered white light configuration allows the light source system to dynamically adjust the spectral composition according to inspection requirements, ensuring UV inspection sensitivity while maintaining imaging consistency in conventional inspection scenarios.

[0029] It should be noted that the housing 1 has a bowl-shaped mounting cavity 101, in which the first mounting layer 102, the second mounting layer 103, and the third mounting layer 104 are all located, and are arranged in a ring shape. The first mounting layer 102, the second mounting layer 103, and the third mounting layer 104 are arranged in a concentric ring shape along the circumference of the mounting cavity 101, creating spatial symmetry in the emission paths of each layer of LEDs. When the UV LED 2011 is working, the vertically stacked layout of the three-layer ring array constructs a three-dimensional ultraviolet light field. The UV beam forms a wide-angle energy coverage through direct projection, creating a uniform conical irradiation field in the detection area. For visible light LEDs, the ring layout allows the red / green / blue / white light to form a homogeneous mixed light field in the spatial domain. Each layer of LEDs achieves spot splicing through precise angle control, creating a superposition effect in the detection center area. This structure demonstrates particular advantages in the inspection of three-dimensional structural components: when the upper-layer components block the direct light path, the geometry of the bowl-shaped cavity creates a compensating path for the lateral outgoing light. Combined with the three-dimensional illumination architecture of the dual-layer UV lamp beads 2011, it forms penetrating illumination in the gaps of complex structures, ensuring complete imaging of the glue-coated areas. In conventional automated optical inspection, the bowl-shaped structure causes the light spots of each layer of lamp beads to converge in the central region, significantly improving the imaging sharpness of small-sized components. Simultaneously, independent layer control enables rapid spectral switching.

[0030] In some embodiments, such as Figure 2As shown, the angle between the first mounting layer 102 and the horizontal plane is α, the angle between the second mounting layer 103 and the horizontal plane is β, and the angle between the third mounting layer 104 and the horizontal plane is γ, where 0≤α≤10°, 40°≤β≤50°, and 55°≤γ≤65°.

[0031] In the above scheme, the first mounting layer 102 adopts a 0-10° near-vertical illumination design to form a basic direct light cone, providing uniform illumination to the detection area while ensuring that the surface features of the upper structural components can be directly observed. The second mounting layer 103 is set with a 40°-50° tilt projection angle, so that the UV beam forms the optimal incident angle with the horizontal plane, effectively improving the UV energy coverage density of the bottom layer of the three-dimensional structural components. The third mounting layer 104 adopts a 55°-65° large tilt angle design to form a wide-angle diffused light field, focusing on enhancing the supplementary lighting capability for side walls and recessed areas. In the UV detection mode, the double-layer UV lamp beads 2011 work together: the top layer vertical UV light establishes the basic excitation field, and the middle layer tilted UV light penetrates the structural gap through the refraction effect. The two form a spatial superposition in the detection area, which increases the UV light energy density on the adhesive surface. This allows the light source used for automatic optical detection to meet more complex and diverse detection scenarios, especially when testing adhesives in obscured scenarios, it can more effectively excite the fluorescent substances in the UV adhesive, making the UV effect brighter and easier to detect. In this design, the angle α between the first mounting layer 102 and the horizontal plane is set to any fixed value within the range of 0° to 10° (e.g., 0°, 3°, 5°, 8°, 10°, etc.); the angle β between the second mounting layer 103 and the horizontal plane is set to any fixed value within the range of 40° to 50° (e.g., 40°, 42°, 45°, 47°, 50°, etc.); and the angle γ between the third mounting layer 104 and the horizontal plane is set to any fixed value within the range of 55° to 65° (e.g., 55°, 58°, 60°, 63°, 65°, etc.). The angles of each layer are independently configured and remain constant.

[0032] In one optional specific implementation, the included angle α of the first mounting layer 102, the included angle β of the second mounting layer 103, and the included angle γ of the third mounting layer 104 are adjustable within their respective set ranges. Specifically, the adjustment can be achieved through an adjustment mechanism, and the angles of each mounting layer can be dynamically adjusted within their corresponding ranges to adapt to different working conditions.

[0033] In some embodiments, the first mounting layer 102 is equipped with UV lamp beads 2011, red lamp beads 2021 and white lamp beads 2024, which are alternately arranged on the first mounting layer 102. The UV lamp beads 2011 and the green lamp beads 2022 disposed on the second mounting layer 103 are alternately arranged on the second mounting layer 102. In the first mounting layer 102, UV lamp beads 2011, red lamp beads 2021, and white lamp beads 2024 are arranged alternately along the circumferential direction and the width direction of the first mounting layer 102, that is, they can be arranged alternately in both directions. The circumferential direction specifically refers to the circumferential direction of the first mounting layer 102, and the width direction specifically refers to the direction from the inner edge of the first mounting layer 102 to the outer edge, forming at least a symmetrical light spot sequence of "UV-red-UV-white". In the second mounting layer 103, UV lamp beads 2011 and green lamp beads 2022 are also arranged alternately along the circumferential direction and the width direction of the second mounting layer 103, forming at least a complementary light intensity distribution of "green-UV-green". This layout design spatially decouples the emission paths of different spectra in the detection area: during UV detection, the first-layer UV lamp 2011 channel and the second-layer UV lamp 2011 channel form a three-dimensional energy coverage, which, combined with the geometric constraints of the bowl-shaped cavity, ensures uniform projection of the UV spot in both the radial and axial directions. In conventional detection mode, the alternating arrangement of red / green / white lamps makes the light illuminating the surface under test more uniform. Especially in the detection of three-dimensional structural components, the first-layer UV lamp 2011 channel can compensate for the light-blocking effect of the upper-layer components, while the staggered configuration of the second-layer UV lamp 2011 and green lamp 2022 ensures the light intensity balance of the middle and lower detection areas. Combined with the basic illumination of the bottom white lamp 2024, this forms a complete light intensity optimization process from UV excitation to visible light imaging.

[0034] It is worth noting that the aforementioned UV lamp beads 2011 are illuminated by at least one control channel. This embodiment achieves precise spatial domain control of spectral energy by constructing a layered programmable UV excitation system. The control system dynamically configures the working mode of each layer of UV lamp beads 2011 based on the characteristics of the detection target: when detecting target A (such as a flat surface element), only the vertical UV light path of the first mounting layer 102 is activated, and its 0-10° near-vertical irradiation characteristics are used to establish a basic excitation field to ensure uniform fluorescence response of the adhesive body; when detecting target B (such as a sidewall adhesive structure), the tilted UV light path of the second mounting layer 103 is illuminated separately, and the refraction enhancement effect generated by the 40°-50° incident angle allows ultraviolet energy to penetrate the gap between the elements to form lateral irradiation; when detecting target C (such as a multi-layer stacked assembly), a layered collaborative strategy is adopted, or the sequential excitation of the double-layer UV light is achieved through timing control, using the vertical light path to establish a reference response, and the tilted light path to enhance shadow area compensation. This control logic, through spectral-angle coordinated design, enables intelligent matching of UV energy distribution with the geometric features of the target object. Especially in the inspection of complex structural components, the three-dimensional projection of dual-layer UV light can construct a "direct-refracted" composite light field, significantly improving the fluorescence excitation efficiency of glue joints. At the same time, nanosecond-level light intensity modulation is achieved through independent drive circuits, effectively suppressing optical crosstalk. Moreover, the drive channel configuration of the UV lamp 2011 follows the principle of dynamic power allocation: when the rated power of a single channel meets the requirements of the inspection scenario, a centralized single-channel drive is used to simplify the control logic; if it is necessary to exceed the power limit of a single channel, the UV lamp group is divided into multiple independent control channels through a power decoupling algorithm, and each channel adopts a time-interleaved or spatial partition control strategy.

[0035] Meanwhile, the blue LED 2023 and the white LED 2024 are alternately arranged on the third mounting layer 104. Through the complementary characteristics of blue and white light colors and the synergistic effect of the cavity reflection structure, the direct illumination light and the reflected light are uniformly superimposed in the detection area, ultimately achieving a consistent brightness distribution and effectively reducing shadows or overly bright areas.

[0036] In addition, the specific arrangement of the LEDs on the first mounting layer 102, the second mounting layer 103 and the third mounting layer 104, as well as the number of LEDs, are not limited, as long as the light illuminating the surface to be tested is uniform.

[0037] It should be noted that the light-emitting component also includes three lamp boards 203, which are respectively attached in parallel to the first mounting layer 102, the second mounting layer 103, and the third mounting layer 104. The first LED 201 and the second LED 202 are arranged on the lamp boards 203. The design of three independent lamp boards 203 shortens the fault repair time, and the replacement of a single module does not require disassembling the entire unit, thus reducing maintenance costs compared to traditional integrated light sources.

[0038] Furthermore, this embodiment constructs a concentrated and stable ultraviolet excitation system through a high-power-density UV light source architecture and thermal management optimization technology. Each UV lamp bead 2011 employs a 3W high-power design, coupled with a narrow beam emission angle of 50°-70°, forming a conical light spot with excellent collimation, enabling focused projection of ultraviolet energy in the detection area. Compared to the traditional 120° wide-angle diffusion, the new narrow-angle design reduces the beam divergence angle and increases the light power density, resulting in higher ultraviolet light energy density on the adhesive surface at the same irradiation distance. In terms of thermal management, the lamp bead's thermal resistance is optimized to 4.5℃ / W, lower than traditional solutions. Combined with the layered lamp board 203 architecture, this minimizes junction temperature fluctuations during UV module operation, effectively suppressing light decay caused by high temperatures. Especially in the inspection of three-dimensional structural components, the synergistic operation of the dual-layer UV lamp beads 2011 achieves energy multiplication through power superposition: when inspecting multi-layer stacked components, the control system can simultaneously activate the UV light sources of the first mounting layer 102 and the second mounting layer 103, with a total optical power output of 2200mW, forming a strong energy field that penetrates the upper-layer components. Combined with the 50°-70° directional projection characteristics, the ultraviolet beam can always maintain a high energy density, ensuring that the fluorescent material in the bottom adhesive is sufficiently excited. This design enables the light source system to maintain high energy output while achieving long-term stability through thermal resistance optimization, significantly improving the reliability of complex inspection scenarios.

[0039] Specifically, in the layout of the first mounting layer 102 and the second mounting layer 103, surface-mount LEDs are used as the light source, mainly utilizing their wide-angle light emission characteristics to achieve uniform surface illumination. The flat package structure of the surface-mount LEDs can form a light field without shadow coverage in the detection area, which is particularly suitable for appearance inspection scenarios that require overall uniformity. Meanwhile, through-hole LEDs, due to their axial focusing characteristics, have a higher concentration of light spot energy. In the third mounting layer 104, they can be flexibly selected according to specific inspection needs: when it is necessary to enhance the recognition of local features, the conical beam of the through-hole LEDs can be accurately projected onto small areas such as solder joints, improving the defect detection rate; if the focus is on the uniformity of basic illumination, the diffuse reflection characteristics of the surface-mount LEDs can form a secondary light path coupling with the inner wall of the bowl-shaped cavity, further optimizing the brightness distribution. This layered light source configuration scheme, by matching the light pattern to the inspection requirements, retains the ability to enhance local areas while ensuring overall uniformity.

[0040] Optionally, the wavelength range of the first LED bead 201 is any one of 320nm-400nm, 280nm-320nm, or 200nm-280nm. The emission wavelength of the UV LED bead 2011 can be flexibly configured among the three ultraviolet bands according to the detection requirements: when using the 320nm-400nm band, its long-wave ultraviolet characteristics are suitable for fluorescent agent excitation and surface microcrack detection scenarios; when using the 280nm-320nm band, the medium-wave ultraviolet energy can enhance the display effect of organic pollutants such as oil stains and fingerprints; if a 200nm-280nm short-wave ultraviolet light source is configured, its high photon energy characteristics can be used to achieve deep structure penetration or excitation of specific inorganic materials. This wavelength-tunable design, by matching the spectral absorption characteristics of the analyte, makes the ultraviolet detection mode material-adaptable.

[0041] In addition, in this embodiment, the PC cover is omitted, thus avoiding the problem of the PC cover yellowing and turning black under long-term UV light exposure.

[0042] On the other hand, an optical inspection device is also provided, including a light source controller. The output terminal of the light source controller is electrically connected to the light source for automatic optical inspection described above via a control channel. The light source controller controls at least one UV lamp bead 2011 in a control channel to be lit simultaneously. For example, the UV lamp bead 2011 on the first mounting layer 102 is controlled to be lit by one control channel, and the UV lamp bead 2011 on the second mounting layer 103 is controlled to be lit by two control channels. The light source controller can control one control channel, any two control channels, or three control channels to be lit simultaneously according to actual inspection requirements. The number of UV lamp bead channels lit can be freely selected as needed to adapt to different inspection requirements.

[0043] In the description herein, it should be understood that the terms "upper," "lower," "left," "right," and other orientations or positional relationships are used only for ease of description and simplification of operation, 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used merely for descriptive distinction and have no special meaning.

[0044] In the description of this specification, references to terms such as "an embodiment," "example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0046] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. A light source for automated optical inspection, characterized in that, include: The housing (1) and the light-emitting lamp group (2) are provided with a first mounting layer (102), a second mounting layer (103) and a third mounting layer (104) sequentially from top to bottom on the inner side of the housing (1). The light-emitting lamp group (2) includes a first lamp bead (201) and a second lamp bead (202). The first mounting layer (102) and the second mounting layer (103) are both provided with the first lamp bead (201). Each of the first mounting layer (102), the second mounting layer (103) and the third mounting layer (104) is provided with the second lamp bead (202). The first lamp bead (201) is a UV lamp bead (2011), and the second lamp bead (202) is one or more of visible light lamp beads.

2. The light source for automatic optical inspection according to claim 1, characterized in that, The second LED (202) includes a red LED (2021), a green LED (2022), a blue LED (2023), and a white LED (2024). The red LED (2021) is disposed on the first mounting layer (102), the green LED (2022) is disposed on the second mounting layer (103), the blue LED (2023) is disposed on the third mounting layer (104), and the white LED (2024) is disposed on the first mounting layer (102) and the third mounting layer (104).

3. The light source for automated optical inspection according to claim 1, characterized in that, The housing (1) is provided with a bowl-shaped mounting cavity (101), the first mounting layer (102), the second mounting layer (103) and the third mounting layer (104) are all located in the mounting cavity (101), and the first mounting layer (102), the second mounting layer (103) and the third mounting layer (104) are all arranged in a ring shape; the angle between the first mounting layer (102) and the horizontal plane is α, and the angle between the second mounting layer (103) and the horizontal plane is β, where 0≤α≤10°, 40°≤β≤50°.

4. The light source for automated optical inspection according to claim 1, characterized in that, The first mounting layer (102) is alternately arranged with UV lamp beads (2011), red lamp beads (2021) and white lamp beads (2024), and the UV lamp beads (2011) are controlled to be lit by at least one control channel.

5. The light source for automated optical inspection according to claim 1, characterized in that, UV lamp beads (2011) and green lamp beads (2022) are alternately arranged on the second mounting layer (103), and the UV lamp beads (2011) are controlled to be lit by at least one control channel.

6. The light source for automated optical inspection according to claim 4 or 5, characterized in that, Each control channel of the UV lamp bead (2011) can be controlled individually.

7. The light source for automated optical inspection according to claim 1, characterized in that, Blue LED beads (2023) and white LED beads (2024) are alternately arranged on the third mounting layer (104).

8. The light source for automated optical inspection according to claim 1, characterized in that, The LEDs on the first mounting layer (102) and the second mounting layer (103) are surface mount LEDs.

9. The light source for automated optical inspection according to claim 1, characterized in that, The first LED bead (201) has a wavelength range of 320nm-400nm, 280nm-320nm, or 200nm-280nm.

10. An optical inspection device, characterized in that, include: A light source controller, wherein the output terminal of the light source controller is electrically connected to the light source for automatic optical detection as described in any one of claims 1-9 via a control channel, and the light source controller controls at least one UV lamp bead in the control channel to be lit simultaneously.

Images