Light supplementing device for machine vision detection and shooting terminal

Abstract

The utility model relates to the technical field of light supplement detection, in particular to a light supplement device for machine vision detection and a shooting terminal. According to the technical scheme, the LED lamp comprises a light transmission assembly, a light source, a shading assembly and a light reflection assembly. The light source is arranged on the light transmission assembly of a hollow structure. The shading assembly is arranged on the light transmission assembly and located on the propagation path of the light source along the light transmission assembly, and a light transmission hole is formed in the shading assembly and located in the non-center position of the transverse section of the light transmission assembly; and the light reflecting assembly is arranged on the light transmitting assembly and is used for irradiating the light transmitted from the light transmitting hole to the texture surface of the to-be-detected component at a preset angle. According to the structure, when the texture surface is detected in a machine vision mode, the light rays for supplementing light irradiate the texture surface at the preset angle, light and shade contrast is generated at the concave-convex part of the texture, the texture features are more prominent, and the shooting quality of the texture surface during machine vision detection is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of supplementary lighting for detection, and in particular to a supplementary lighting device and a shooting terminal for machine vision detection. Background Technology

[0002] In the fabrication process of laser bars, the finished laser bars need to be divided using a cutting tool. Cleavage lines are a common defect that can occur during this process. The presence of cleavage lines has a significant impact on the performance and subsequent applications of the laser bars, making the detection of cleavage line defects crucial for ensuring product quality.

[0003] Camera imaging technology is a commonly used method for detecting cleavage defects in laser bars. However, the traditional vertical illumination method has obvious limitations. Due to the physical characteristics of the cleavage texture itself, the differences in optical reflection and scattering properties between it and the bar substrate cannot be effectively highlighted under vertical illumination. This makes it difficult for the camera to capture images containing clear cleavage texture features, making it difficult to accurately identify and analyze key information such as the morphology, size, and distribution of the cleavage texture, thus affecting the accurate assessment and control of the laser bar quality. Utility Model Content

[0004] In view of the above-mentioned technical problems, the present invention provides a supplementary lighting device and shooting terminal for machine vision inspection, which can be applied to supplementary lighting of textured surfaces and improves the shooting quality of textured surfaces during machine vision inspection.

[0005] The present invention provides the following solutions:

[0006] In a first aspect, embodiments of the present invention provide a supplementary lighting device for machine vision inspection, the device comprising:

[0007] The light-transmitting component has a hollow structure;

[0008] The light source is mounted on the light-transmitting component;

[0009] A light-shielding component is disposed on the light-transmitting component and located along the propagation path of the light source along the light-transmitting component. The light-shielding component is provided with a light-transmitting hole, which is located at a non-central position on the transverse cross-section of the light-transmitting component.

[0010] A reflective component is mounted on the light transmission component. The reflective component is used to direct the light transmitted through the light transmission hole to the textured surface of the part to be inspected at a preset angle.

[0011] In one alternative embodiment, the light-shielding component includes:

[0012] A light-blocking sheet with light-transmitting holes;

[0013] An adjustment mechanism, connected to the light-shielding plate, is installed on the light-transmitting component. The adjustment mechanism is used to adjust the light-shielding position of the light-shielding plate so that the light-transmitting hole is located at a non-central position in the transverse cross-section of the light-transmitting component.

[0014] In one optional embodiment, the light-transmitting aperture is located off-center from the light-blocking plate; the adjustment mechanism includes:

[0015] The adjusting ring has a hollow structure and is provided with an outer step and an inner step. The inner step of the adjusting ring is in contact with the first end face of the light-shielding sheet, and the outer step of the adjusting ring is sleeved with the light-transmitting tube of the light-transmitting component.

[0016] A fixing ring is installed inside the adjusting ring. The fixing ring is attached to the second end face of the light-shielding sheet to install the light-shielding sheet inside the adjusting ring.

[0017] In one optional embodiment, the light-shielding component further includes:

[0018] The adapter ring has a hollow structure and an outer step. The outer step of the adapter ring is fitted onto the inner step of the adjusting ring.

[0019] In an optional embodiment, the adjustment mechanism further includes:

[0020] The adjusting bolt is installed radially along the adjusting ring and located on one side of the light-shielding plate;

[0021] The elastic element is installed opposite the adjusting bolt, located between the inner wall of the adjusting ring and the light-shielding plate.

[0022] In one optional embodiment, the elastic element is an arc-shaped spring sheet, with both ends of the arc-shaped spring sheet fitting against the light-shielding sheet, and the arched portion of the arc-shaped spring sheet fitting against the inner wall of the adjusting ring.

[0023] In one alternative embodiment, the outer periphery of the adjustment ring is provided with an adjustment scale, and the optical tube of the light transmission component is provided with an indicator scale for measuring the adjustment scale.

[0024] In one alternative embodiment, the first through hole of the adjusting ring is larger than the second through hole of the fixing ring, and the light-shielding sheet is oval in shape.

[0025] In one alternative embodiment, the reflective component includes:

[0026] The first reflecting mirror is installed inside the first horizontal light tube of the light-transmitting assembly;

[0027] A semi-transparent, semi-reflective mirror is installed inside the second horizontal light tube of the light transmission assembly. The first and second horizontal light tubes are connected via a vertical light tube.

[0028] Secondly, embodiments of the present invention also provide a shooting terminal, which includes any of the supplementary lighting devices mentioned in the first aspect.

[0029] Compared with the prior art, the supplementary lighting device and imaging terminal for machine vision inspection of this utility model have the following advantages:

[0030] This utility model's technical solution includes a light-transmitting component, a light source, a light-shielding component, and a reflective component. The light source is disposed on the hollow light-transmitting component; the light-shielding component is disposed on the light-transmitting component, located along the propagation path of the light source along the light-transmitting component, and has a light-transmitting hole located at a non-central position on the transverse cross-section of the light-transmitting component; the reflective component is disposed on the light-transmitting component, and is used to illuminate the textured surface of the component to be inspected at a preset angle with the light transmitted through the light-transmitting hole. When this structure inspects the textured surface using machine vision, the supplementary light illuminates the textured surface at a preset angle, creating a contrast between light and dark in the uneven parts of the texture, making the texture features more prominent, and the captured image more clearly presents the texture details. This structure is suitable for supplementary lighting of textured surfaces, improving the image quality of textured surfaces during machine vision inspection. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this specification or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the supplementary lighting device provided in the embodiment of the present utility model;

[0033] Figure 2 A three-dimensional structural schematic diagram of the light-shielding component provided in an embodiment of this utility model;

[0034] Figure 3 This is a cross-sectional structural diagram of the light-shielding component provided in an embodiment of the present utility model.

[0035] Explanation of reference numerals in the attached diagram: 1-Light transmission component, 2-Light source, 3-Light shielding component, 4-Reflecting component, 5-Aperture stop, 6-Camera, 7-Lens, 8-Component to be inspected;

[0036] 11-First horizontal light tube, 12-Second horizontal light tube, 13-Vertical light tube;

[0037] 31-Light-passing hole, 32-Light-shielding plate, 33-Adjustment mechanism, 34-Adjustment ring, 35-Fixing ring, 36-Adapter ring, 37-Adjustment bolt, 38-Elastic element, 39-Adjustment scale;

[0038] 41-First reflecting mirror, 42-Semi-transparent semi-reflective mirror. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the embodiments of the present utility model.

[0040] The supplementary lighting device of this utility model embodiment can be applied to any part under inspection with a textured surface for supplementary lighting. Traditional supplementary lighting methods mostly illuminate the textured surface vertically. When the camera takes a picture, the textured surface cannot show differences in brightness, resulting in the inability to accurately detect defects in the textured surface. The following will take the cleavage texture detection of laser bar as an example to specifically illustrate how to apply supplementary lighting to this type of part.

[0041] Please see Figure 1 , Figure 1 This is a schematic diagram of a supplementary lighting device for machine vision inspection provided in an embodiment of the present invention. The supplementary lighting device includes a light-transmitting component 1, a light source 2, a light-shielding component 3, and a reflective component 4.

[0042] The light transmission component 1 has a hollow structure and can be assembled from multiple light tubes, which are connected by a threaded structure or fasteners. For example, it can be configured with a first horizontal light tube 11, a vertical light tube 13, and a second horizontal light tube 12, with the first horizontal light tube 11 and the second horizontal light tube 12 connected through the vertical light tube 13.

[0043] Light source 2 can be configured as an LED (Light Emitting Diode), and the light source is located on the light transmission component 1. Light source 2 is connected to a DC power supply, and can also be configured with a regulator, which is connected to both light source 2 and the DC power supply, and the brightness of light source 2 is adjusted by the regulator.

[0044] The light-shielding component 3 can be made of metal or plastic material, and only needs to be able to block the light emitted by the light source 2. The light-shielding component 3 is disposed on the light-transmitting component 1, located on the propagation path of the light source 2 along the light-transmitting component 1. The light-shielding component 3 is provided with a light-transmitting hole 31, which is located at a non-central position in the transverse cross-section of the light-transmitting component 1. The diameter of the light-transmitting hole 31 can be configured according to actual needs, for example, 2-8mm. The light-transmitting hole 31 can be set as a circular hole or other shapes, without specific limitations.

[0045] The reflective assembly 4 consists of at least one reflector and is disposed on the light-transmitting assembly 1. The reflective assembly 4 reflects the light transmitted through the light-transmitting hole 31, causing it to illuminate the textured surface of the component 8 under inspection at a preset angle. The reflective assembly 4 may include a first reflector and a second reflector. The light transmitted through the light-transmitting hole 31 is reflected by the first reflector to the second reflector, and then reflected by the second reflector onto the textured surface of the component under inspection. The arrangement angles of the first and second reflectors are set based on the actual scene.

[0046] like Figure 1 As shown in the figure, the dashed line represents the supplementary lighting path of the light source. An aperture stop 5 is set between the light source 2 and the light-shielding component 3. The light source 2 is installed at the end of the first horizontal light tube 11. The reflector component 4 includes a first reflector 41 and a semi-transparent semi-reflective mirror 42. When supplementary lighting is needed for the component 8 under inspection, the light source 2 is turned on. The light source 2 illuminates the first reflector 41 through the aperture stop 5 and the light-transmitting hole 31. The first reflector 41 reflects the light to the semi-transparent semi-reflective mirror 42, and the semi-transparent semi-reflective mirror 42 reflects the light back onto the textured surface of the component 8 under inspection. The camera 6 is set at the end of the second horizontal light tube 12, and the lens 7 is set at the other end of the second horizontal light tube 12. After supplementary lighting is provided for the component 8 under inspection, the image is formed inside the camera 6 through the lens 7. Because the supplementary light illuminates the textured surface at a preset angle, a contrast between light and dark is generated in the uneven parts of the texture, and the texture features can be more prominently displayed in the image.

[0047] In practical applications, because the texture undulation heights corresponding to different textured surfaces vary, illuminating the textured surface from the same preset angle may not achieve the desired effect for all textured features. Therefore, it is necessary to adjust the illumination angle. The specific structure of this type of light-shielding component 3 will be described below. Please refer to... Figure 2 , Figure 2 This is a schematic diagram of the structure of the light-shielding component 3. The light-shielding component 3 includes a light-shielding sheet 32 ​​and an adjustment mechanism 33.

[0048] The light-shielding plate 32 is provided with a light-transmitting hole 31. An adjustment mechanism 33 is connected to the light-shielding plate 32 and is mounted on the light-transmitting component 1. The adjustment mechanism 33 is used to adjust the light-shielding position of the light-shielding plate 32 so that the light-transmitting hole 31 is located at a non-central position in the transverse cross-section of the light-transmitting component 1. The adjustment mechanism 33 may include a vertical pusher and a horizontal pusher. The light-shielding plate 32 is mounted through a pair of horizontal clamps, allowing it to move within the clamps. The vertical pusher and horizontal pusher respectively push the light-shielding plate 32 vertically and horizontally, placing the light-transmitting hole 31 in different positions. Due to the change in the position of the light-transmitting hole 31, the angle at which the supplementary light illuminates the textured surface changes accordingly, so that the illumination angle is suitable for supplementary lighting of the textured surface.

[0049] For example, the light-transmitting hole 31 is located off-center of the light-shielding plate 32; the adjustment mechanism 33 includes an adjustment ring 34 and a fixing ring 35. The adjustment ring 34 has a hollow structure, with an outer step and an inner step. The inner step of the adjustment ring 34 fits against the first end face of the light-shielding plate 32, and the outer step of the adjustment ring 34 is sleeved with the light-transmitting tube of the light-transmitting assembly 1. The fixing ring 35 is installed inside the adjustment ring 34 and fits against the second end face of the light-shielding plate 32 to install the light-shielding plate 32 inside the adjustment ring 34. An internal thread can be machined inside the adjustment ring 34, and the length of the internal thread is configured according to actual needs. An external thread is machined on the outer periphery of the fixing ring 35, and the fixing ring 35 is screwed into the internal thread to fix the light-shielding plate 32. Alternatively, a retaining ring groove can be machined inside the adjustment ring 34, and an inner retaining ring can be installed in the retaining ring groove to fix the light-shielding plate 32. When the position of the light-transmitting hole 31 needs to be adjusted, the adjusting ring 34 can be rotated. Since the light-transmitting hole 31 is located in a non-central position of the light-shielding plate 32, the position of the light-transmitting hole 31 changes when the adjusting ring 34 is rotated, so that different supplementary light angles can be used to illuminate the textured surface and select the appropriate supplementary light angle.

[0050] Furthermore, to facilitate control of the adjustment amount of the rotating adjustment ring 34, an adjustment scale 39 can be provided on the outer periphery of the adjustment ring 34, and an indicator scale of the metering adjustment scale 39 can be provided on the optical tube of the light transmission component 1. When the adjustment ring 34 is rotated, the adjustment amount is determined by the variable between the adjustment scale 39 and the indicator scale.

[0051] In practical applications, the limitations of changing the position of the light-transmitting hole 31 through a rotating structure may result in poor image quality of the textured surface. Therefore, in one specific embodiment, the adjustment mechanism 33 further includes an adjustment bolt 37 and an elastic element 38.

[0052] The outer circumference of the adjusting bolt 37 can be machined with anti-slip texture. The adjusting bolt 37 is installed radially along the adjusting ring 34 and located on one side of the light-shielding plate 32. The elastic element 38 is installed opposite the adjusting bolt 37, located between the inner wall of the adjusting ring 34 and the light-shielding plate 32. Please continue reading. Figure 2 and Figure 3 Tightening the adjusting bolt 37 allows the light-shielding plate 32 to move radially between the adjusting ring 34 and the fixed ring 35, in the direction of the elastic element 38. When the adjusting bolt 37 is turned in the opposite direction, the light-shielding plate 32 moves in the direction of the adjusting bolt 37 under the elastic force of the elastic element 38. This structure allows the position of the light-transmitting hole 31 to be adjusted radially along the adjusting ring 34, thereby changing the supplementary lighting angle.

[0053] The elastic element 38 can be configured according to actual needs, for example, as a compression spring; it can also be configured as an arc-shaped spring, such as... Figure 2As shown, the two ends of the arc-shaped spring are attached to the light-shielding plate 32, and the arched part of the arc-shaped spring is attached to the inner wall of the adjusting ring 34. The arc-shaped spring has good applicability when installed in this structure.

[0054] To prevent light leakage when adjusting the position of the light-transmitting hole 31, the first through hole of the adjusting ring 34 is larger than the second through hole of the fixing ring 35, and the light-shielding plate 32 is oval-shaped. This structure can prevent light leakage from the outer periphery of the light-shielding plate 32 when adjusting the position of the light-transmitting hole 31.

[0055] Furthermore, the light-shielding assembly 3 also includes an adapter ring 36. The adapter ring 36 has a hollow structure and an outer step, which fits onto the inner step of the adjusting ring 34. The adapter ring 36 can be fixedly connected to the light tube by fasteners or mounting sleeves. When the adjusting ring 34 is rotated, the first horizontal light tube 11 is in a fixed state to prevent damage to the cable of the light source 2 from rotating along with the first horizontal light tube 11. When assembling the adapter ring 36, the first horizontal light tube 11 can be divided into a first horizontal segment and a second horizontal segment. The light-shielding assembly 3 is installed between the first horizontal segment and the second horizontal segment. Alternatively, a strip-shaped connector can be configured to fix the first horizontal segment and the second horizontal segment together without affecting the rotation of the light-shielding assembly 3.

[0056] Based on the same technical concept as the supplementary lighting device, this embodiment of the invention also provides a shooting terminal, which includes any of the supplementary lighting devices described above.

[0057] The technical solution provided in this embodiment of the utility model has at least the following technical effects or advantages:

[0058] This utility model's technical solution includes a light-transmitting component, a light source, a light-shielding component, and a reflective component. The light source is disposed on the hollow light-transmitting component; the light-shielding component is disposed on the light-transmitting component, located along the propagation path of the light source along the light-transmitting component, and has a light-transmitting hole located at a non-central position on the transverse cross-section of the light-transmitting component; the reflective component is disposed on the light-transmitting component, and is used to illuminate the textured surface of the component to be inspected at a preset angle with the light transmitted through the light-transmitting hole. When this structure inspects the textured surface using machine vision, the supplementary light illuminates the textured surface at a preset angle, creating a contrast between light and dark in the uneven parts of the texture, making the texture features more prominent, and the captured image more clearly presents the texture details. This structure is suitable for supplementary lighting of textured surfaces, improving the image quality of textured surfaces during machine vision inspection.

[0059] 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 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 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.

[0060] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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, they should not be construed as limitations on this application.

[0061] In this application, unless otherwise expressly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; "connection" can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean 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 according to the specific circumstances.

[0062] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

Claims

1. A supplementary lighting device for machine vision inspection, characterized in that, The device includes: The light-transmitting component has a hollow structure; A light source is disposed on the light-transmitting component; A light-shielding component is disposed on the light-transmitting component and located on the propagation path of the light source along the light-transmitting component. The light-shielding component is provided with a light-transmitting hole, which is located at a non-central position in the transverse cross-section of the light-transmitting component. A reflective component is disposed on the light-transmitting component, and the reflective component is used to irradiate the textured surface of the component to be inspected with light transmitted through the light-transmitting hole at a preset angle.

2. The supplementary lighting device for machine vision inspection according to claim 1, characterized in that, The light-shielding component includes: A light-shielding sheet, wherein the light-shielding sheet is provided with a light-transmitting hole; An adjustment mechanism is connected to the light-shielding sheet and is mounted on the light-transmitting component. The adjustment mechanism is used to adjust the light-shielding position of the light-shielding sheet so that the light-transmitting hole is located at a non-central position in the transverse cross-section of the light-transmitting component.

3. The supplementary lighting device for machine vision inspection according to claim 2, characterized in that, The light-transmitting hole is located at a non-central position on the light-shielding plate; the adjustment mechanism includes: The adjusting ring has a hollow structure and is provided with an outer step and an inner step. The inner step of the adjusting ring is in contact with the first end face of the light-shielding sheet, and the outer step of the adjusting ring is sleeved with the light-transmitting tube of the light-transmitting component. A fixing ring is installed inside the adjusting ring, and the fixing ring is fitted with the second end face of the light-shielding sheet to install the light-shielding sheet inside the adjusting ring.

4. The supplementary lighting device for machine vision inspection according to claim 3, characterized in that, The light-shielding component also includes: The adapter ring has a hollow structure and an outer step. The outer step of the adapter ring is fitted onto the inner step of the adjusting ring.

5. The supplementary lighting device for machine vision inspection according to claim 3, characterized in that, The adjustment mechanism also includes: An adjusting bolt is installed radially along the adjusting ring and located on one side of the light-shielding sheet; An elastic element is installed opposite the adjusting bolt, located between the inner wall of the adjusting ring and the light-shielding plate.

6. The supplementary lighting device for machine vision inspection according to claim 5, characterized in that, The elastic element is an arc-shaped spring sheet, the two ends of which are in contact with the light-shielding sheet, and the arched part of the arc-shaped spring sheet is in contact with the inner wall of the adjusting ring.

7. The supplementary lighting device for machine vision inspection according to claim 3, characterized in that, The outer periphery of the adjustment ring is provided with an adjustment scale, and the light tube of the light transmission component is provided with an indicator scale for measuring the adjustment scale.

8. The supplementary lighting device for machine vision inspection according to claim 3, characterized in that, The first through hole of the adjusting ring is larger than the second through hole of the fixing ring, and the light-shielding plate is oval in shape.

9. The supplementary lighting device for machine vision inspection according to claim 1, characterized in that, The reflective component includes: The first reflector is installed inside the first horizontal light tube of the light-transmitting assembly; A semi-transparent, semi-reflective mirror is installed inside the second horizontal light tube of the light transmission component, and the first horizontal light tube and the second horizontal light tube are connected through a vertical light tube.

10. A shooting terminal, characterized in that, The shooting terminal includes the supplementary lighting device as described in any one of claims 1-9.

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