A visual inspection system based on dual-band synchronous imaging

Abstract

This application discloses a visual inspection system based on dual-band synchronous imaging, including a dual-band light source device, a first imaging unit, and a second imaging unit. The dual-band light source device is used to simultaneously project a first-band light and a second-band light onto the object to be inspected at the inspection station. The wavelengths of the first-band light and the second-band light are different. The first imaging unit includes a first camera and a first filter mounted in front of its lens. The first filter is configured to allow only the first-band light to pass through. The first imaging unit is used to receive the first-band light reflected by a first region of the object to be inspected to obtain an image of the first region. The second imaging unit includes a second camera and a second filter mounted in front of its lens. The second filter is configured to allow only the second-band light to pass through. The second imaging unit is used to receive the second-band light reflected by a second region of the object to be inspected to obtain an image of the second region. This application can improve inspection efficiency.

Description

Technical Field

[0001] This utility model relates to the field of light source detection device technology, and in particular to a combined light source system. Background Technology

[0002] In container manufacturing, bottle caps and bodies require separate visual inspections. Traditional inspection methods typically employ two independent workstations, each equipped with its own light source and camera, resulting in large equipment footprints, complex inspection processes, and high costs. Furthermore, the two-workstation setup increases the difficulty of equipment debugging and maintenance, impacting overall production efficiency. While existing technologies have attempted to utilize multi-camera systems, issues such as light source interference and image overlap often arise, making it difficult to achieve efficient inspection at a single workstation. Therefore, there is an urgent need for an integrated visual inspection solution capable of simultaneously inspecting bottle caps and bodies at the same workstation, optimizing equipment layout and improving inspection efficiency. Utility Model Content

[0003] This application provides a visual inspection system based on dual-band synchronous imaging, which can improve inspection efficiency.

[0004] This application provides a visual inspection system based on dual-band synchronous imaging, including a dual-band light source device, a first imaging unit, and a second imaging unit. The dual-band light source device is used to simultaneously project a first-band light and a second-band light onto a test object located at the inspection station, wherein the wavelengths of the first-band light and the second-band light are different. The first imaging unit includes a first camera and a first filter mounted in front of its lens, wherein the first filter is configured to allow only the first-band light to pass through, and the first imaging unit is used to receive the first-band light reflected by a first region of the test object to obtain an image of the first region. The second imaging unit includes a second camera and a second filter mounted in front of its lens, wherein the second filter is configured to allow only the second-band light to pass through, and the second imaging unit is used to receive the second-band light reflected by a second region of the test object to obtain an image of the second region.

[0005] In some embodiments, the dual-band light source device includes:

[0006] The bottom light source is used to emit light in the first wavelength band; and

[0007] The top light source is positioned above the bottom light source and is used to emit light in the second wavelength band.

[0008] In some embodiments, the optical axis of the bottom light source is set at an angle to the optical axis of the top light source.

[0009] In some embodiments, the dual-band light source device is arranged in an arc shape so that one side of the dual-band light source device has an opening.

[0010] In some embodiments, the dual-band light source device has a semi-annular structure.

[0011] In some embodiments, the dual-band light source device includes:

[0012] The shell forms the containing space;

[0013] A first light source board is disposed in the accommodating space, constituting the bottom light source;

[0014] A second light source plate is disposed in the receiving space and located above the first light source plate, constituting the top-level light source; and

[0015] A diffuser, connected to the housing and covering the opening of the receiving space, is used to diffuse the light emitted by the bottom light source and the top light source.

[0016] In some embodiments, the housing includes an arc-shaped base plate, an arc-shaped side plate surrounding the periphery of the arc-shaped base plate, and an end plate connected to the edge of the arc-shaped base plate and the edge of the arc-shaped side plate. The diffuser is installed at the opening formed by the arc-shaped base plate, the arc-shaped side plate, and the end plate.

[0017] In some embodiments, the first band light is red light with a wavelength of 620nm±10nm, and the second band light is infrared light with a wavelength of 850nm±10nm; the first filter is a 620nm±10nm bandpass filter, and the second filter is an 850nm±10nm bandpass filter.

[0018] In some embodiments, a control unit is further included, which is communicatively connected to the dual-band light source device, the first imaging unit and the second imaging unit, for synchronously triggering the emission of light from the dual-band light source device and the image acquisition of the first imaging unit and the second imaging unit.

[0019] In some embodiments, the object being tested is a container, the first region is the container body, and the second region is the container cap.

[0020] The visual inspection system based on the embodiments of this application, through the coordinated operation of the dual-band light source device, the first imaging unit, and the second imaging unit, achieves at least the following beneficial effects:

[0021] 1. The bottle body and cap are inspected simultaneously at the same workstation, eliminating the need for two separate workstations, which significantly reduces the equipment footprint and optimizes the production line layout.

[0022] 2. Dual cameras acquire images synchronously, transforming serial detection into parallel processing, which significantly shortens the detection cycle of a single product and improves overall detection efficiency.

[0023] 3. The combination of a light source of a specific wavelength and a corresponding narrow-band pass filter forms two independent and non-interfering optical paths, effectively avoiding the influence of stray light and ensuring the clarity and high signal-to-noise ratio of the bottle body and cap images, providing a reliable foundation for subsequent image analysis algorithms. Attached Figure Description

[0024] 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the structure of a visual inspection system provided in an embodiment of this application;

[0026] Figure 2 This is a cross-sectional schematic diagram of a dual-band light source device provided in an embodiment of this application;

[0027] Figure 3 A schematic diagram of the optical axes of the top and bottom light sources;

[0028] Figure 4 This is an exploded view of a dual-band light source device provided in an embodiment of this application;

[0029] Figure 5 This is a schematic diagram of a combined light source system provided in an embodiment of this application.

[0030] Explanation of icon numbers:

[0031] 1. Visual inspection system; 10. Dual-band light source device; 11. Bottom light source; 12. Top light source; 110. Housing; 111. Arc-shaped bottom plate; 1111. Third mounting part; 112. Arc-shaped side plate; 1121. First side plate; 1122. Second side plate; 1123. First mounting part; 1124. Second mounting part; 1125. Fourth mounting part; 113. End plate; 120. First light source plate; 130. Second light source plate; 140. Diffuser; 20. First imaging unit; 210. First camera; 220. First filter; 30. Second imaging unit; 310. Second camera; 320. Second filter.

[0032] The realization of the purpose, functional features and advantages of this utility model will be further explained with reference to the accompanying drawings and embodiments. Detailed Implementation

[0033] To make the objectives, technical solutions and advantages of this utility model clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0034] Where the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this invention. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this invention as detailed in the appended claims.

[0035] In the description of this utility model, it should be understood that the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "multiple" refers to two or more. "And / or" describes 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, or B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0037] In the production of containers (such as cosmetic bottles and medicine bottles), both the bottle cap and the bottle body must undergo rigorous visual inspection to ensure they are free of defects such as scratches, contamination, and deformation. Traditional inspection methods typically involve two independent inspection stations, each equipped with a dedicated light source and camera to sequentially inspect the bottle body and cap. This approach suffers from drawbacks such as large equipment footprint, complex inspection processes, high costs, and limited production efficiency. Although existing technologies have attempted to deploy multi-camera systems at the same station, these generally suffer from problems such as mutual interference between light sources and overlapping images, making it difficult to achieve efficient and high-precision synchronous inspection.

[0038] Therefore, this embodiment provides a visual inspection system 1 based on dual-band synchronous imaging. This visual inspection system 1 achieves synchronous, interference-free imaging and inspection of container caps and bodies at the same workstation through optical band separation technology.

[0039] See Figure 1 The visual inspection system 1 includes a dual-band light source device 10, a first imaging unit 20, a second imaging unit 30, and a control unit.

[0040] A dual-band light source device 10 is positioned above the testing station to simultaneously project a first-band light and a second-band light onto the container being tested on the conveyor belt. The first-band light and the second-band light are light with different wavelengths. Preferably, the first-band light is visible red light with a wavelength of 620nm±10nm, and the second-band light is infrared light with a wavelength of 850nm±10nm.

[0041] Please refer to the following: Figure 2 In some embodiments, the dual-band light source device 10 adopts a layered structure, including a bottom light source 11 and a top light source 12. The bottom light source 11 is used to emit a first-band light (such as 620nm red light), and the top light source 12 is disposed above the bottom light source 11 to emit a second-band light (such as 850nm infrared light). For further optimization of the illumination effect in different height areas, please refer to [reference needed]. Figure 3 The optical axis of the bottom light source 11 is set at an angle to the optical axis of the top light source 12. For example, the optical axis of the bottom light source 11 is tilted downward to cover and illuminate the bottle body area of ​​the container at the optimal angle; the optical axis of the top light source 12 is set to point to the bottle cap area at a higher position, so that both the bottle body and the bottle cap can obtain uniform and sufficient illumination.

[0042] Please see Figure 1 The first imaging unit 20 includes a first camera 210 and a first filter 220 mounted in front of its lens. The first filter 220 is configured to allow only a first wavelength of light to pass through. The first imaging unit 20 is used to receive the first wavelength of light reflected from a first region of the object under test to acquire an image of the first region. The first filter 220 is a 620nm±10nm bandpass filter, whose passband center wavelength matches the first wavelength of light (620nm±10nm red light), allowing only this narrow wavelength of light to pass through efficiently. Therefore, the first imaging unit 20 is dedicated to receiving the first wavelength of light reflected back from the bottle body, thereby acquiring a high-contrast, high-definition image of the bottle body.

[0043] Please see Figure 1The second imaging unit 30 includes a second camera 310 and a second filter 320 mounted in front of its lens. The second filter 320 is configured to allow only the second wavelength light to pass through. The second imaging unit 30 is used to receive the second wavelength light reflected from a second region of the object under test to acquire an image of the second region. The second filter 320 is an 850nm±10nm bandpass filter, whose passband center wavelength matches the second wavelength light (850nm±10nm infrared light), allowing only this infrared band to pass through. Therefore, the second imaging unit 30 is dedicated to receiving the second wavelength light reflected back from the bottle cap, thereby acquiring a clean image of the bottle cap unaffected by light reflected from the bottle body.

[0044] The control unit, as the control core of the vision inspection system 1, is communicatively connected to the dual-band light source device 10, the first imaging unit 20, and the second imaging unit 30. It is configured such that when a container arrives at the inspection station, the bottom light source 11 and the top light source 12 of the dual-band light source device 10 are simultaneously triggered to emit light, and the first camera 210 and the second camera 310 are simultaneously triggered to acquire images. This strict synchronous control mechanism ensures that the bottle body image and the bottle cap image are captured at the same time, improving inspection efficiency. Combined with the physical isolation of the optical bands, it fundamentally eliminates optical path cross-interference between the two imaging systems.

[0045] The visual inspection system 1 based on the embodiments of this application, through the coordinated operation of the dual-band light source device 10, the first imaging unit 20, and the second imaging unit 30, achieves at least the following beneficial effects:

[0046] 1. The bottle body and cap are inspected simultaneously at the same workstation, eliminating the need for two separate workstations, which significantly reduces the equipment footprint and optimizes the production line layout.

[0047] 2. Dual cameras acquire images synchronously, transforming serial detection into parallel processing, which significantly shortens the detection cycle of a single product and improves overall detection efficiency.

[0048] 3. The precise matching of a light source of a specific wavelength with the corresponding narrow-band pass filter forms two independent and non-interfering optical paths, effectively avoiding the influence of stray light and ensuring the clarity and high signal-to-noise ratio of the bottle body and cap images, providing a reliable foundation for subsequent image analysis algorithms.

[0049] In some embodiments of this application, the structure of the dual-band light source device 10 has been further optimized to better adapt to the detection scenarios of automated production lines and improve illumination uniformity and system adaptability.

[0050] Please see Figure 1 and Figure 5The dual-band light source device 10 has an arc-shaped luminous surface, making its overall structure a non-enclosed lighting structure with an opening on one side. Specifically, the dual-band light source device 10 can be constructed as a fan-shaped or approximately C-shaped annular segment structure. Preferably, the opening is oriented approximately perpendicular to the material transport direction of the conveyor belt, and the cameras of the first imaging unit 20 and the second imaging unit 30 can be arranged on the side where the opening of the dual-band light source device 10 is located. This structural design facilitates use with the first imaging unit 20 and the second imaging unit 30, adapts to assembly line movement, and provides uniform and sufficient illumination for containers of different heights and diameters, thereby improving the system's adaptability to different bottle sizes.

[0051] Please see Figure 5 Furthermore, the dual-band light source device 10 has a semi-circular structure, that is, an arc segment of approximately 180° in the circumferential direction. This structure can ensure the illumination coverage while leaving sufficient space for the camera's field of view, facilitating the arrangement of the imaging optical path.

[0052] Please see Figure 4 In terms of specific structural composition, the dual-band light source device 10 includes a housing 110, a first light source plate 120, a second light source plate 130, and a diffuser 140. The housing 110 forms an accommodating space, within which the first light source plate 120 is disposed, constituting the bottom light source 11 for emitting first-band light. The second light source plate 130 is also disposed within the accommodating space, located above the first light source plate 120, constituting the top light source 12 for emitting second-band light. The diffuser 140 is installed on the housing 110 and covers the light outlet of the accommodating space. Its function is to scatter and homogenize the light emitted by the bottom light source 11 and the top light source 12, eliminating hot spots and improving the uniformity of the light field, thereby ensuring the consistency of illumination on the surface of the object being photographed and the image quality.

[0053] Please see Figure 2 and Figure 4 In some embodiments, the housing 110 includes an arcuate base plate 111, an arcuate side plate 112 surrounding the periphery of the arcuate base plate 111, and an end plate 113 connected to the edge of the arcuate base plate 111 and the edge of the arcuate side plate 112. The diffuser 140 is installed at the opening formed by the arcuate base plate 111, the arcuate side plate 112, and the end plate 113.

[0054] Please see Figure 2The arc-shaped side plate 112 includes a first side plate 1121 and a second side plate 1122 connected in the height direction. The first side plate 1121 has a first mounting portion 1123 on its inner side facing the interior of the housing 110, and the second side plate 1122 has a second mounting portion 1124 located below the first mounting portion 1123 on its inner side. The upper and lower ends of the first light source plate 120 are respectively fixed to the first mounting portion 1123 and the second mounting portion 1124, so that they present a preset tilt angle under the joint constraint of the two.

[0055] Please see Figure 2 The bottom surface of the arc-shaped base plate 111 is provided with a third mounting part 1111, and the inner side surface of the first side plate 1121 is provided with a fourth mounting part 1125. The upper and lower ends of the second light source plate 130 are respectively fixed to the third mounting part 1111 and the fourth mounting part 1125, thus presenting another preset tilt angle under the joint constraint of the two. Through the cooperation of the above-mentioned mounting parts, the optical axes of the bottom light source 11 and the top light source 12 are respectively pointed to the bottle body and bottle cap area of ​​the container, realizing targeted lighting for different height parts.

[0056] Based on the above embodiments, the first mounting part 1123, the second mounting part 1124, the third mounting part 1111, and the fourth mounting part 1125 can be specifically implemented as fixing grooves formed on the surface of the corresponding plates. By correspondingly embedding the edges of the first light source plate 120 and the second light source plate 130 into the fixing grooves, a heat dissipation gap can be formed between the back of the light source plate and the housing 110, thereby effectively improving the heat dissipation efficiency of the light source during operation and extending the service life of the device.

[0057] In some alternative embodiments, a mounting plane with a preset tilt angle can also be directly constructed on the curved side plate 112. The light source plate can be directly attached and fixed to the corresponding tilted mounting surface through its back side, thereby achieving the required tilt setting. This embodiment has a stable structure, is easy to assemble, and helps to ensure the pointing accuracy of the light source.

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

Claims

1. A visual inspection system (1) based on dual-band synchronous imaging, characterized in that, include: A dual-band light source device (10) is used to simultaneously project a first-band light and a second-band light onto the object to be tested located at the detection station. The wavelengths of the first-band light and the second-band light are different. The first imaging unit (20) includes a first camera (210) and a first filter (220) mounted in front of its lens. The first filter (220) is configured to allow only light of the first wavelength band to pass through. The first imaging unit (20) is used to receive the first wavelength band light reflected by the first region of the object under test in order to obtain an image of the first region. The second imaging unit (30) includes a second camera (310) and a second filter (320) mounted in front of its lens, the second filter (320) being configured to allow only the second band of light to pass through, and the second imaging unit (30) being used to receive the second band of light reflected by the second region of the object under test in order to obtain an image of the second region.

2. The visual inspection system (1) based on dual-band synchronous imaging according to claim 1, characterized in that, The dual-band light source device (10) includes: The bottom light source (11) is used to emit light in the first wavelength band; and The top light source (12) is positioned above the bottom light source (11) and is used to emit the second band light.

3. The visual inspection system (1) based on dual-band synchronous imaging according to claim 2, characterized in that, The optical axis of the bottom light source (11) is set at an angle to the optical axis of the top light source (12).

4. The visual inspection system (1) based on dual-band synchronous imaging according to claim 2, characterized in that, The dual-band light source device (10) is arranged in an arc shape so that one side of the dual-band light source device (10) has an opening.

5. A visual inspection system (1) based on dual-band synchronous imaging according to claim 4, characterized in that, The dual-band light source device (10) has a semi-circular structure.

6. A visual inspection system (1) based on dual-band synchronous imaging according to claim 2, characterized in that, The dual-band light source device (10) includes: The shell (110) forms a receiving space; The first light source plate (120) is disposed in the accommodating space to form the bottom light source (11). A second light source plate (130) is disposed in the accommodating space and above the first light source plate (120), constituting the top-level light source (12); and A diffuser (140) is connected to the housing (110) and covers the opening of the receiving space for diffusing the light emitted by the bottom light source (11) and the top light source (12).

7. A visual inspection system (1) based on dual-band synchronous imaging according to claim 6, characterized in that, The housing (110) includes an arc-shaped bottom plate (111), an arc-shaped side plate (112) surrounding the periphery of the arc-shaped bottom plate (111), and an end plate (113) connected to the edge of the arc-shaped bottom plate (111) and the edge of the arc-shaped side plate (112). The diffuser (140) is installed at the opening formed by the arc-shaped bottom plate (111), the arc-shaped side plate (112), and the end plate (113).

8. A visual inspection system (1) based on dual-band synchronous imaging according to any one of claims 1-7, characterized in that, The first band light is red light with a wavelength of 620nm±10nm, and the second band light is infrared light with a wavelength of 850nm±10nm; the first filter (220) is a 620nm±10nm bandpass filter, and the second filter (320) is an 850nm±10nm bandpass filter.

9. A visual inspection system (1) based on dual-band synchronous imaging according to any one of claims 1-7, characterized in that, It also includes a control unit, which is communicatively connected to the dual-band light source device (10), the first imaging unit (20) and the second imaging unit (30), and is used to synchronously trigger the emission of light from the dual-band light source device (10) and the image acquisition of the first imaging unit (20) and the second imaging unit (30).

10. A visual inspection system (1) based on dual-band synchronous imaging according to any one of claims 1-7, characterized in that, The object being tested is a container, the first area is the container body, and the second area is the container cap.

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