Optical isolation structure and double-light-source detection equipment

Abstract

The invention relates to the technical field of light source detection, in particular to a light isolation structure and a double-light-source detection device.The light isolation structure is provided with a light-transmitting space, and a light isolation plate is arranged in the light-transmitting space; the light isolation plate divides the light-transmitting space into a first detection space and a second detection space, and the first detection space and the second detection space are used for light rays of different detection light sources to penetrate through respectively. In the technical scheme of the invention, the invention aims to provide the optical isolation structure for isolating double light rays simultaneously generated by double light sources in the double-light-source detection equipment, so that the UPH of a production line is ensured, and the detection misjudgment rate of a product is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of self-light source detection, and particularly to an optical isolation structure and a dual-light source detection device. Background Art

[0002] After the flexible line is assembled, a dual-light source detection device is required to perform position detection and glue path calibration on the corresponding product. The light source detection device uses an LED light source and a UV light source. Among them, the LED light source is used to illuminate the workpiece so that the vision system can capture the geometric features (such as edges, hole positions, contours, etc.) on the surface of the workpiece; the UV light source excites the fluorescent substances in the glue path to emit visible light, so that the vision system can obtain feature data such as glue path width and continuity.

[0003] The applicant found that the relevant detection methods generally include the following two types. The first is time-sharing exposure + single camera to achieve dual detection, that is, the LED and UV light sources are lit at different times, and the vision system collects images twice. This method can avoid mutual interference between the dual light sources and ensure the accuracy of the two types of detections. However, it is necessary to set timing control, which increases the detection time and affects the UPH (Units Per Hour) of the production line; the second is dual-light source simultaneous exposure + dual cameras to achieve dual detection, that is, the LED and UV light sources are lit at the same time, and the vision system collects images at one time. However, limited by the length of the flexible line and the light source detection space, the distance between the dual light sources is relatively close, and there will be a problem of mutual interference between the dual light sources when the vision captures the product features, resulting in a high detection misjudgment rate of the product and affecting the overall process yield of the product.

[0004] Therefore, a solution is needed that can reduce the detection misjudgment rate of products while ensuring the UPH of the production line. Summary of the Invention

[0005] The main object of the present invention is to provide an optical isolation structure, which aims to isolate the dual light rays generated by the dual light sources in the dual-light source detection device, so as to reduce the detection misjudgment rate of products while ensuring the UPH of the production line.

[0006] To achieve the above object, the optical isolation structure has a light-transmitting space, and an optical isolation plate is provided in the light-transmitting space; the optical isolation plate divides the light-transmitting space into a first detection space and a second detection space, and the first detection space and the second detection space are respectively used for the light rays of different detection light sources to pass through.

[0007] In an embodiment of the present invention, the optical isolation plate includes an absorbent layer and two transparent layers, the absorbent layer connects the two transparent layers and is located between the two transparent layers; a reflection surface is formed at the connection of each absorbent layer and one transparent layer.

[0008] In an embodiment of the present invention, the two surfaces of the light-absorbing layer facing the two transparent layers are respectively a first light-absorbing surface and a second light-absorbing surface;

[0009] The first light-absorbing surface is arranged facing the first detection space, and the second light-absorbing surface is arranged facing the second detection space; the first light-absorbing surface is used for absorbing the light from the detection light source in the first detection space, and the second light-absorbing surface is used for absorbing the light from another detection light source in the second detection space;

[0010] The light absorption wavelength of the first light-absorbing surface is greater than that of the second light-absorbing surface.

[0011] In an embodiment of the present invention, a plurality of annular raised rings are provided on one side of the light isolation plate facing the first detection space, and the raised rings are concentrically arranged.

[0012] In an embodiment of the present invention, one side of the light isolation plate facing the second detection space is concave to form a light-absorbing arc surface.

[0013] In an embodiment of the present invention, the light isolation structure further includes two light reflectors, the two light reflectors are arranged in alignment and enclose to form the light transmission space; the light isolation plate extends along the direction from one light reflector to the other light reflector and connects the two light reflectors.

[0014] In an embodiment of the present invention, each light reflector includes an integrally formed reflection section and a converging section, the reflection section and the converging section are arranged in sequence along the direction from the light incident side to the light exit side of the light transmission space, and light reflecting surfaces are provided on the sides of the two reflection sections and the two converging sections facing each other, and the light reflecting surfaces are configured to reflect light to the light exit side of the light transmission space.

[0015] In an embodiment of the present invention, the end of each reflection section away from the converging section extends towards the other light reflector.

[0016] In an embodiment of the present invention, at the light incident side and the light exit side of the light transmission space, the two ends of the light isolation plate are flush with the two ends of the light reflector.

[0017] The present invention further provides a dual-light-source detection device, and the dual-light-source detection device includes a dual-light-source component and the light isolation structure as described above;

[0018] The dual-light-source component includes a first detection light source emitting a first wavelength range and a second detection light source emitting a second wavelength range; the first detection light source is located in the first detection space, and the second detection light source is located in the second detection space.

[0019] In the technical solution of the present invention, the optical isolation structure is used to isolate the dual light rays generated simultaneously by the dual light sources in the dual light source detection device. The light isolation plate of the optical isolation structure divides the light transmission space of the optical isolation structure into a first detection space and a second detection space. The first detection space and the second detection space are respectively used for the light rays of different detection light sources to pass through. In this way, through the physical isolation of the light isolation plate, synchronous lighting and synchronous imaging are realized, without the need for time-sharing operation. While ensuring the synchronous operation of the dual light sources to ensure the UPH of the production line, the detection misjudgment rate of the product is avoided from being reduced due to light interference when the dual light sources detect simultaneously. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0021] Figure 1 Structural schematic diagram of an embodiment of the optical isolation structure provided by the present invention;

[0022] Figure 2 Structural schematic diagram of an embodiment of the light isolation plate provided by the present invention;

[0023] Figure 3 Structural schematic diagram of an embodiment of the light absorption layer provided by the present invention;

[0024] Figure 4 Structural schematic diagram of another embodiment of the light isolation plate provided by the present invention;

[0025] Figure 5 Structural schematic diagram of still another embodiment of the light isolation plate provided by the present invention;

[0026] Figure 6 Structural schematic diagram of an embodiment of the light reflecting member provided by the present invention.

[0027] Explanation of the reference numerals in the drawings:

[0028] 10. Optical isolation structure; 11. Light isolation plate; 10a1. First detection space; 10a2. Second detection space; 111. Light absorption layer; 111a. First light absorption surface; 111b. Second light absorption surface; 112. Transparent layer; 11a. Reflective surface; 113. Raised circular ring; 114. Light absorption arc surface; 12. Light reflecting member; 121. Reflective section; 122. Converging section; 123. Connecting section.

[0029] The realization, functional features and advantages of the object of the present invention will be further described in conjunction with the embodiments with reference to the accompanying drawings. Detailed implementation manners

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope protected by the present invention.

[0031] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, the descriptions involving "first", "second", etc. in the present invention are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel solutions. Taking "A and / or B" as an example, it includes the solution of A, or the solution of B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions appears to be contradictory or unable to be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] Please refer to Figure 1 , the optical isolation structure 10 has a light-transmitting space, and an optical isolation plate 11 is provided in the light-transmitting space; the optical isolation plate 11 divides the light-transmitting space to form a first detection space 10a1 and a second detection space 10a2, and the first detection space 10a1 and the second detection space 10a2 are respectively used for allowing the light of different detection light sources to pass through.

[0034] It should be noted in advance that the optical isolation structure 10 proposed in the present invention is applied to a dual-light-source detection device. The dual-light-source detection device includes an LED light source for position detection (of course, it can also be a halogen lamp, a laser light source, etc.) and a UV light source for glue path detection (of course, it can also be a blue LED, a near-infrared light source lamp). The LED light source and the UV light source are turned on simultaneously. At the same time, each light source corresponds to an information acquisition system, and each information acquisition system includes at least an industrial camera and an optical lens (the number of optical lenses is not limited according to requirements such as clarity). In this way, the position information and the glue path information of the workpiece can be detected simultaneously.

[0035] In the technical solution of the present invention, the optical isolation structure 10 is used to isolate the dual light rays generated simultaneously by the dual light sources in the dual-light-source detection device. The light isolation plate 11 of the optical isolation structure 10 divides the light transmission space of the optical isolation structure 10 into a first detection space 10a1 and a second detection space 10a2. The first detection space 10a1 and the second detection space 10a2 are respectively used for the light rays of different detection light sources to pass through. In this way, through the physical isolation of the light isolation plate 11, synchronous lighting and synchronous imaging are realized, and there is no need for time-sharing operation. While ensuring the synchronous operation of the dual light sources and ensuring the UPH of the production line, the detection misjudgment rate of the product caused by light interference during the simultaneous detection of the dual light sources is avoided.

[0036] Specifically, the optical isolation structure 10 is fixed at the dual light sources of the dual-light-source detection device. Two light sources with different functions are respectively located in the first detection space 10a1 and the second detection space 10a2. That is, the detection light source for obtaining position information (taking the LED lamp as an example) is located in the first detection space 10a1, and the detection light source for obtaining glue path information (taking the UV lamp as an example) is located in the second detection space 10a2. Each detection space has a light incident side and a light exit side arranged in alignment. It can be understood that according to the detection layout of the dual-light-source detection device, the direction from the light incident side to the light exit side can be the vertical direction perpendicular to the horizontal plane, the horizontal direction parallel to the horizontal plane, or the inclined direction forming an angle with the horizontal plane (that is, the inclined direction is between the vertical direction and the horizontal direction), which is not limited here. Each detection light source can extend into the detection space from the light incident side, and the detection light rays emitted by the detection light source are projected onto the surface of the workpiece through the light exit side. When the dual light sources of the dual-light-source detection device work simultaneously, the light isolation plate 11 can isolate the light rays generated by the two light sources, block the interference of the light rays emitted by the two different light sources, and avoid the mutual interference of the two different light rays due to interference, resulting in low recognition of the features captured by the information acquisition system.

[0037] Further, please refer to Figure 2, the optical isolation plate 11 includes a light-absorbing layer 111 and two transparent layers 112. The light-absorbing layer 111 connects the two transparent layers 112 and is located between the two transparent layers 112. A reflection surface 11a is formed at the connection between each light-absorbing layer 111 and a transparent layer 112. Specifically, the optical isolation plate 11 is a laminated composite structure. To achieve a stable connection between the light-absorbing layer 111 and the transparent layer 112, optical-grade epoxy resin (refractive index ≈ 1.5) or UV curable adhesive (such as NOA61) can be used to bond the light-absorbing layer 111 and the transparent layer 112 together. After the adhesive cures, it not only provides high-strength bonding but also maintains optical transparency to ensure that light passes through smoothly. Of course, black silicone can also be used at the outer peripheral edge of the light-absorbing layer 111 and the transparent layer 112 to fill the edge gap and avoid lateral light leakage. When the light-absorbing layer 111 is connected to each transparent layer 112, according to the Fresnel reflection principle, an interface between the light-absorbing layer 111 and each transparent layer 112 forms a reflection surface 11a. The reflection surface 11a on each side can reflect light back into the detection space it faces, thereby reducing light penetration, improving the optical isolation effect, avoiding interference between light rays from different light sources, and ensuring the accuracy and stability of detection.

[0038] Further, please refer to Figure 3, the two surfaces of the light absorption layer 111 facing the two transparent layers 112 are respectively the first light absorption surface 111a and the second light absorption surface 111b; the first light absorption surface 111a faces the first detection space 10a1, and the second light absorption surface 111b faces the second detection space 10a2; the first light absorption surface 111a is used to absorb the light from the detection light source in the first detection space 10a1, and the second light absorption surface 111b is used to absorb the light from another detection light source in the second detection space 10a2; the light absorption wavelength of the first light absorption surface 111a is greater than that of the second light absorption surface 111b. Specifically, since the first detection light source in the first detection space 10a1 and the second detection light source in the second detection space 10a2 are light sources of two different wavelengths. In one embodiment, the first detection light source is an LED lamp for position detection, and the second detection light source is a UV lamp for glue path detection. The light absorption wavelength of the first light absorption layer 111 corresponding to the LED lamp is 400 nm to 700 nm, and the light absorption wavelength of the second light absorption layer 111 corresponding to the UV lamp is greater than 320 nm and less than 400 nm. In order to prevent the light emitted by the LED lamp from entering the second detection space 10a2, the material of the first light absorption layer 111 can be carbon nanotubes or graphene, etc., so as to prevent the light in the first detection space 10a1 from entering the second detection space 10a2. The second light absorption layer 111 is a zinc oxide (ZnO) nanoporous coating or an organic compound coating such as benzotriazole or benzophenone, so as to prevent the light in the second detection space 10a2 from entering the first detection space 10a1. The light absorption layer 111 made of different materials can effectively absorb light of different wavelengths, ensure the performance of the light isolation plate 11 in the dual-light-source detection device, avoid light interference, and improve the accuracy and stability of detection.

[0039] In one embodiment, please refer to Figure 4 , on the side of the light isolation plate 11 facing the first detection space 10a1, there are a plurality of annular raised rings 113. The raised rings 113 are concentrically arranged, and the raised rings 113 form a continuous corrugated structure on the light isolation plate 11. The distance between adjacent raised rings 113 is designed according to the visible light wavelength and is not limited here. Each raised ring 113 can scatter and optimize the light to a certain extent, so that the light is more evenly distributed in the first detection space 10a1, avoiding the problem of overexposure in a region on the surface of the workpiece to be detected caused by light concentration, thereby improving the accuracy of the dual-light-source detection device for grasping the position characteristics.

[0040] In one embodiment, please refer to Figure 5, one side of the light isolation plate 11 facing the second detection space 10a2 is concavely arranged to form a light-absorbing arc surface 114. Specifically, the light-absorbing arc surface 114 can be designed as an ellipsoidal surface to reflect the scattered light emitted by the UV lamp to the second detection area, improve the light intensity, and thus improve the clarity of the glue path detection; a UV absorption layer is coated on the bottom of the arc surface to absorb the residual UV light that is not reflected and prevent it from leaking back to the LED side.

[0041] In an embodiment of the present invention, please refer to Figure 6 , the light isolation structure 10 further includes two reflecting members 12. The two reflecting members 12 are arranged in opposition and enclose a light-transmitting space. Specifically, the two reflecting members 12 are of the same shape and the same material. The two reflecting members 12 are symmetric with respect to the line connecting the two detection light sources, so that the distance between each reflecting member 12 and the detection light source is equal, thereby ensuring the symmetry and uniformity of the light on both sides, which is beneficial to improving the accuracy and consistency of detection. When the detection light source is located in the corresponding detection space, the reflecting member 12 can gather the light emitted by each detection light source to reduce the light escape amount, thereby improving the overall brightness of the detection space; the light isolation plate 11 extends along the direction from one reflecting member 12 to the other reflecting member 12 and connects the two reflecting members 12. The two sides of the light isolation plate 11 are respectively connected to one reflecting member 12 to realize the isolation of the first detection space 10a1 and the second detection space 10a2. The light generated by different detection light sources can only irradiate the surface of the workpiece to be detected through the light-emitting side, thereby avoiding the light interference between the two light sources.

[0042] Further, please refer to Figure 6 , each reflecting member 12 includes a reflecting section 121 and a converging section 122 of an integral structure. The reflecting section and the converging section 122 are arranged in sequence along the direction from the light-incident side to the light-emitting side of the light-transmitting space. The reflecting section 121 is closer to the detection light source than the converging section 122. The opposite sides of the two reflecting sections 121 and the two converging sections 122 are provided with reflecting surfaces, and the reflecting surfaces are configured to reflect light to the light-emitting side of the light-transmitting space. Specifically, an aluminum film or a dielectric film stack (such as TiO2 / SiO2) can be provided on the surfaces of the reflecting section 121 and the converging section 122 to realize light reflection for different wavelength bands. Through the synergistic effect of the reflecting section 121 and the converging section 122, the light can be more evenly distributed to the detection area, improving the clarity and accuracy of detection; further, in order to realize the disassembly and assembly of the light isolation structure 10 on the dual-light-source detection device, the reflecting member 12 further includes a connecting section 123. The connecting section 123 connects one end of the reflecting section 121 far from the converging section 122. The connecting section 123 is used to connect the dual-light-source detection device. It can be understood that the connecting section 123 can be provided with structures such as screw holes to realize the detachable connection with the dual-light-source detection device, or a welding method can be used to realize the fixed connection with the dual-light-source detection device. The specific connection method is not limited herein.

[0043] In an embodiment of the present invention, please refer to Figure 6 , the end of each reflection segment 121 away from the converging segment 122 extends towards the other light reflector 12. In this way, a tighter reflection path can be formed in the detection space, making the light more concentrated during the reflection process, reducing light scattering and leakage. At the same time, by the extension of the end of the reflection segment 121 away from the converging segment 122, the possibility of unwanted light entering the detection space from the light incident side can be further reduced, thereby enhancing the light isolation effect. Meanwhile, the reflection surface of the reflection segment 121 forms an inclined surface, which can reflect the light in the detection space to the light output side, thereby increasing the surface brightness of the workpiece to be detected, and facilitating the double-light-source detection device to improve the clarity of the features required for obtaining the position information and glue path information.

[0044] In an embodiment of the present invention, please refer to Figure 6 , on the light incident side and the light output side of the light-transmitting space, the two ends of the light isolation plate 11 are flush with the two ends of the light reflector 12. At this time, the two ends of the light isolation plate 11 can reduce the inclined light (the light emitted by the LED lamp) emitted from the first detection space 10a1 from irradiating the surface area of the workpiece to be detected corresponding to the second detection space 10a2, thereby reducing the shadow area of the surface area of the workpiece to be detected corresponding to the second detection space 10a2, and thus improving the accuracy of the glue path information.

[0045] The present invention also provides a double-light-source detection device, which includes a double-light-source assembly and a light isolation structure 10. The double-light-source assembly includes a first detection light source emitting a first wavelength range and a second detection light source emitting a second wavelength range; the first detection light source is located in the first detection space 10a1, and the second detection light source is located in the second detection space 10a2. In this way, the light emitted by different light sources is isolated by the light isolation structure 10 to avoid the interference of the light generated by the double light sources. While ensuring the synchronous operation of the double light sources to ensure the UPH of the production line, the detection misjudgment rate of the product is avoided from being reduced due to light interference during the simultaneous detection of the double light sources. The specific structure of the light isolation structure 10 refers to the above embodiment. Since the double-light-source detection device proposed by the present invention adopts all the technical solutions of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be elaborated here one by one.

[0046] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or any direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. An optical isolation structure is applied to a dual-light-source detection device, and is characterized in that, The optical isolation structure has a light-transmitting space, and an optical isolation plate (11) is provided in the light-transmitting space; the optical isolation plate (11) divides the light-transmitting space into a first detection space (10a1) and a second detection space (10a2), and the first detection space (10a1) and the second detection space (10a2) are respectively used for allowing the light of different detection light sources to pass through.

2. The optical isolation structure according to claim 1, wherein The optical isolation plate (11) includes a light-absorbing layer (111) and two transparent layers (112), the light-absorbing layer (111) connects the two transparent layers (112) and is located between the two transparent layers (112); a reflection surface (11a) is formed at the connection of each light-absorbing layer (111) and one transparent layer (112).

3. The optical isolation structure according to claim 2, wherein, The two surfaces of the light-absorbing layer (111) facing the two transparent layers (112) are respectively a first light-absorbing surface (111a) and a second light-absorbing surface (111b); The first light-absorbing surface (111a) is arranged facing the first detection space (10a1), and the second light-absorbing surface (111b) is arranged facing the second detection space (10a2); the first light-absorbing surface (111a) is used for absorbing the light from the detection light source in the first detection space (10a1), and the second light-absorbing surface (111b) is used for absorbing the light from another detection light source in the second detection space (10a2); The light-absorbing wavelength of the first light-absorbing surface (111a) is greater than the light-absorbing wavelength of the second light-absorbing surface (111b).

4. The optical isolation structure according to claim 1, wherein A plurality of annular raised rings (113) are provided on the side of the optical isolation plate (11) facing the first detection space (10a1), and the plurality of raised rings (113) are concentrically arranged.

5. The optical isolation structure according to claim 4, characterized in that, The side of the optical isolation plate (11) facing the second detection space (10a2) is concave to form a light-absorbing arc surface (114).

6. The optical isolation structure according to any one of claims 1 to 5, characterized in that, The optical isolation structure further includes two light-reflecting members (12), the two light-reflecting members (12) are arranged in alignment and enclose the light-transmitting space; the optical isolation plate (11) extends along the direction from one light-reflecting member (12) to the other light-reflecting member (12) and connects the two light-reflecting members (12).

7. The optical isolation structure according to claim 6, wherein Each light-reflecting member (12) includes an integrally formed reflection section (121) and a converging section (122), the reflection section (121) and the converging section (122) are arranged in sequence along the direction from the light-incident side to the light-emitting side of the light-transmitting space, and a light-reflecting surface is provided on the side where the two reflection sections (121) and the two converging sections (122) face each other, and the light-reflecting surface is configured to reflect light to the light-emitting side of the light-transmitting space.

8. The optical isolation structure according to claim 7, wherein, The end of each reflection section (121) away from the converging section (122) extends towards the other light-reflecting member (12).

9. The optical isolation structure according to claim 6, wherein On the light-incident side and the light-emitting side of the light-transmitting space, the two ends of the optical isolation plate (11) are flush with the two ends of the light-reflecting member (12).

10. A dual-light-source detection device, characterized in that, The dual-light-source detection device includes a dual-light-source assembly and the optical isolation structure according to any one of claims 1 to 9; The dual light source assembly includes a first detection light source emitting a first wavelength range and a second detection light source emitting a second wavelength range; the first detection light source is located within the first detection space (10a1), and the second detection light source is located within the second detection space (10a2).

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