Appearance defect detection system for electronic product

Abstract

The utility model discloses an electronic product appearance defect detection system, and belongs to the technical field of electronic product appearance defect detection. The electronic product appearance defect detection system comprises a machine base, a small-view-field camera, a large-view-field camera, a dome light source and a light source set. The small-view-field camera is installed on the machine base, the large-view-field camera and the small-view-field camera are arranged in a spaced mode in the first direction, the dome light source is installed below a lens of the small-view-field camera, the light source set is installed below a lens of the large-view-field camera, and the light source set comprises at least one of a coaxial light source, an ultraviolet light source and a multi-partition light source. According to the electronic product appearance defect detection system, the small-field-of-view camera and the large-field-of-view camera are combined for use, and a multifunctional combined time sequence photographing mode can be realized, so that the defect detection types can be increased, and the detection capability of the electronic product appearance defect detection system is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic product appearance defect detection, and in particular, relates to an electronic product appearance defect detection system. Background Art

[0002] In the prior art, electronic product appearance defect detection systems usually use a camera and three-color AOI light source lighting in combination. Since the three-color AOI light source only has three angles, the existing electronic product appearance defect detection systems are usually suitable for detecting the quality of solder joints of surface mount components. Defects in other position features of circuit board products cannot be detected. In addition, some small solder joints may be falsely detected or missed. As a result, the detection capabilities of the electronic product appearance defect detection systems in the prior art have certain limitations. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an electronic product appearance defect detection system, which aims to improve the detection capability of the electronic product appearance defect detection system so that the electronic product appearance defect detection system can detect multiple defects.

[0004] In a first aspect, the present application provides an electronic product appearance defect detection system, comprising:

[0005] Machine base;

[0006] A small field of view camera, mounted on the base;

[0007] A large-field-of-view camera is spaced apart from the small-field-of-view camera along a first direction;

[0008] A dome light source is installed below the small field of view camera lens;

[0009] A light source group is installed below the wide-field-of-view camera lens, and the light source group includes at least one of a coaxial light source, an ultraviolet light source, and a multi-partition light source.

[0010] According to the electronic product appearance defect detection system of the present application, the combination of a small field of view camera and a dome light source can be used to detect problems such as collapsed pins, warped pins, or foreign objects in the slots of connectors. When a coaxial light source is combined with a large field of view camera, it can be used to detect defects such as crushing of metal shielding covers and warped parts. When an ultraviolet light source is combined with a large field of view camera, it can be used to detect residual glue, overflowing glue and other defects. When a multi-zone light source is combined with a large field of view camera, it can be used to detect concave-convex defects, missing parts and other defects in metal areas. Therefore, the electronic product appearance defect detection system of the present application can detect at least two defect problems of electronic products. In addition, the combination of a small field of view camera and a large field of view camera can realize a multifunctional combined sequential photography method, thereby increasing the types of defect detection and improving the detection capability of the electronic product appearance defect detection system.

[0011] According to one embodiment of the present application, the object space resolution of the small field of view camera is P1, where 0 μm / pixel <P1≤5μm / pixel。

[0012] According to one embodiment of the present application, the object space resolution of the large field of view camera is P2, where 0 μm / pixel <P2≤15μm / pixel。

[0013] According to one embodiment of the present application, the axis of the dome light source and the axis of the small field of view camera lens are arranged collinearly.

[0014] According to one embodiment of the present application, the light source group includes a coaxial light source, an ultraviolet light source and a multi-partition light source, and the coaxial light source, the ultraviolet light source and the multi-partition light source are arranged in sequence in a direction away from the wide field of view camera lens.

[0015] According to one embodiment of the present application, the ultraviolet light source is a ring-shaped light source.

[0016] According to one embodiment of the present application, the inner diameter of the ultraviolet light source is greater than the radius of the light-emitting surface of the coaxial light source.

[0017] According to one embodiment of the present application, the inner circle of the ultraviolet light source is the circumscribed circle of the field of view of the large-field-of-view camera.

[0018] According to one embodiment of the present application, the multi-partition light source is a ring-shaped light source, and an inner diameter of the multi-partition light source is greater than an outer diameter of the ultraviolet light source.

[0019] According to an embodiment of the present application, the multi-partition light source is a ring-shaped light source, and the multi-partition light source includes a plurality of partitions, and the areas of the partitions are the same.

[0020] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 It is a structural diagram of an electronic product appearance defect detection system provided in an embodiment of the present application;

[0023] Figure 2 yes Figure 1 Schematic diagram of the structure of the electronic product appearance defect detection system (another angle).

[0024] Reference numerals:

[0025] Electronic product appearance defect detection system 100;

[0026] Base 110;

[0027] Small field of view camera 120;

[0028] Large field of view camera 130;

[0029] Dome light source 140;

[0030] Coaxial light source 151 , ultraviolet light source 152 , multi-partition light source 153 . DETAILED DESCRIPTION

[0031] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0032] Reference below Figure 1-Figure 2 A system for detecting appearance defects of electronic products according to an embodiment of the present application is described.

[0033] Reference Figure 1 and Figure 2 The electronic product appearance defect detection system 100 includes a base 110, a small field of view camera 120, a large field of view camera 130, a dome light source 140 and a light source group.

[0034] The small field of view camera 120 is installed on the base 110 .

[0035] It should be noted that the small field of view camera 120 is a camera with a smaller field of view. The small field of view camera 120 usually has a narrower field of view and can capture smaller objects or details.

[0036] In addition, there are many ways to install the small field of view camera 120 on the base 110. For example, in one embodiment, the small field of view camera 120 can be directly fixed to the base 110 using a fixing device such as a screw or a clamp to ensure the position and stability of the camera. In one embodiment, the small field of view camera 120 can be installed on the base 110 through a rotating axis or a rotating platform so that it can rotate around the rotating axis to adjust the shooting angle and direction of the camera. In another embodiment, a pan-tilt head can also be used as an intermediate piece to connect the small field of view camera 120 and the base 110. The position, direction and height of the camera can be easily adjusted through the adjustment mechanism of the pan-tilt head. In another embodiment, the small field of view camera 120 can also be quickly and conveniently installed on the base 110 through a snap-on structure, while ensuring the stability and reliability of the camera.

[0037] The large field of view camera 130 is arranged at intervals with the small field of view camera 120 along the first direction, so that the large field of view camera 130 can capture a wider scene, while the small field of view camera 120 can capture more detailed parts. By arranging the two at intervals, more comprehensive information and more specific details can be obtained at the same time, so as to better understand the entire scene. The large field of view camera 130 and the small field of view camera 120 can respectively shoot at different scales and details, so as to obtain more levels of information. By combining the information of the two, the scene can be analyzed and understood more deeply. The large field of view camera 130 and the small field of view camera 120 can respectively shoot at different targets, thereby reducing the time for repeated shooting and adjustment. At the same time, through reasonable interval setting, interference and overlap between the two can be avoided, and shooting efficiency can be further improved. By arranging the large field of view camera 130 and the small field of view camera 120 at intervals, the mutual influence and interference between the two can be reduced, thereby enhancing the stability of the entire system.

[0038] The dome light source 140 is installed below the lens of the small field of view camera 120. In this way, the dome light source 140 can provide uniform and soft light, reduce shadows and reflections below the lens of the small field of view camera 120, so that the captured image is clearer and more detailed. The dome light source 140 can enhance the contrast of the image by adjusting the light intensity and angle, making the image more vivid and prominent. The dome light source 140 is installed below the lens of the small field of view camera 120, which can avoid the influence of other light sources on the shooting, reduce interference, and improve the accuracy of shooting. The dome light source 140 can be installed and adjusted quickly and conveniently, which provides convenience for shooting and improves work efficiency. In addition, the combination of the dome light source 140 and the lens of the small field of view camera 120 can be used to solve problems such as collapsed pins, warped pins, or foreign objects in the groove of the connector.

[0039] The light source group is installed below the lens of the wide field camera 130, and the light source group includes at least one of a coaxial light source 151, an ultraviolet light source 152, and a multi-partition light source 153. In this way, the coaxial light source 151 can provide light coaxial with the lens of the wide field camera 130, which can eliminate the shadow and reflection of the image and improve the clarity and quality of the image. The ultraviolet light source 152 can excite the fluorescence on the surface of the object, which is helpful to identify and analyze certain specific objects. The multi-partition light source 153 can provide multiple independent light sources to illuminate the object from multiple angles and in all directions, so as to obtain richer image information. By installing at least one of multiple types of light sources below the lens of the wide field camera 130, a variety of lighting functions can be achieved. For example, the coaxial light source 151 can be used for the detection of defects such as metal shielding cover crushing and warping, the ultraviolet light source 152 can be used for the detection of defects such as residual glue and overflow glue, and the multi-partition light source 153 can be used for the detection of defects such as concave-convex defects and missing parts in the metal area. Such a combination can adapt to different application scenarios and needs.

[0040] For the electronic product appearance defect detection system 100 according to the present application, the combination of the small field of view camera 120 and the dome light source 140 can be used to detect problems such as connector pin collapse, pin warping, or foreign objects in the slot. When the coaxial light source 151 and the large field of view camera 130 are combined, it can be used to detect defects such as metal shielding cover indentation and warped parts. When the ultraviolet light source 152 and the large field of view camera 130 are combined, it can be used to detect defects such as residual glue and overflow glue. When the multi-zone light source 153 and the large field of view camera 130 are combined, it can be used to detect defects such as concavities and convexities in the metal area and missing parts. Therefore, the electronic product appearance defect detection system 100 of the present application can detect at least two types of defect problems of electronic products. In addition, by using the combination of the small field of view camera 120 and the large field of view camera 130, a multi-functional combined sequential photographing method can be realized, thereby increasing the types of defect detection and improving the detection ability of the electronic product appearance defect detection system 100.

[0041] It should be noted that the small field of view camera 120 and the dome light source 140 form a small field of view subsystem, and the large field of view camera 130 and the light source group form a large field of view subsystem. The small field of view subsystem and the large field of view subsystem can work simultaneously or separately.

[0042] In an embodiment, the object space resolution of the small field of view camera 120 is P1, where 0 μm / pixel < P1 ≤ 5 μm / pixel. In this way, the small field of view camera 120 has the characteristic of high resolution and can capture smaller and finer details. The object space resolution P1 being between 0 μm / pixel and 5 μm / pixel means that the minimum object size that can be resolved by each pixel is between 0 μm and 5 μm, enabling the capture of very detailed details, and making the images captured by the small field of view camera 120 have high clarity, capable of clearly presenting the outline and surface details of the object, facilitating subsequent detection and analysis.

[0043] Preferably, 2.5 μm / pixel ≤ P1 ≤ 3.5 μm / pixel. Further, in the embodiment of the present application, the object space resolution of the small field of view camera 120 is 3 μm / pixel. Of course, in other embodiments, the object space resolution of the small field of view camera 120 can be selected according to needs, and the present application does not make any limitations in this regard.

[0044] In one embodiment, the object space resolution of the large field of view camera 130 is P2, where 0 μm / pixel < P2 ≤ 15 μm / pixel. In this way, the large field of view camera 130 has a wide field of view range and can capture a larger scene. The object space resolution P2 being between 0 μm / pixel and 15 μm / pixel means that the minimum object size that each pixel can resolve is between 0 μm and 15 μm, enabling the capture of a wider range of details and information.

[0045] Preferably, 9 μm / pixel ≤ P2 ≤ 11 μm / pixel. Further, in the embodiment of the present application, the object space resolution of the large field of view camera 130 is 10 μm / pixel. Of course, in other embodiments, the object space resolution of the large field of view camera 130 can be selected as needed, and the present application does not limit this.

[0046] Refer to Figure 1 and Figure 2 , in one embodiment, the axis of the dome light source 140 is collinear with the axis of the lens of the small field of view camera 120. In this way, the collinear setting can reduce reflection and refraction in the optical path, enabling light to reach the camera lens more directly, thereby simplifying the optical path design. Since the loss of light during transmission is reduced, the camera can receive more light, thus improving the brightness and clarity of the imaging. This is particularly important for imaging applications that require high precision and high clarity. The collinear setting means that the dome light source 140 and the camera lens can be more easily aligned, reducing the time and complexity of debugging. This is very beneficial for occasions on the production line that require quick and accurate installation. The collinear setting can reduce the need for additional optical elements (such as mirrors, prisms, etc.), thereby reducing the complexity of the mechanical structure. This helps to reduce manufacturing costs and improve the stability and reliability of the system. The dome light source 140 can provide uniform and soft light. When it is collinear with the camera lens, it can ensure that the target object is evenly illuminated, which is beneficial to improving the imaging quality and recognition accuracy.

[0047] Refer to Figure 1 and Figure 2In one embodiment, the light source group includes a coaxial light source 151, an ultraviolet light source 152, and a multi-partition light source 153. The coaxial light source 151, the ultraviolet light source 152, and the multi-partition light source 153 are arranged in sequence in the direction away from the lens of the wide field of view camera 130. In this way, the combination of the coaxial light source 151, the ultraviolet light source 152, and the multi-partition light source 153 can provide a wider and more uniform lighting, so that the object can get a better lighting effect. Since the light source group is arranged in sequence in the direction away from the lens of the wide field of view camera 130, the reflection and interference of the light on the surface of the object by the lens optical axis can be reduced, thereby improving the imaging quality. The multi-partition light source 153 can independently control the brightness of each partition, so that the color reproduction is more accurate and the color expression of the image is improved. The combination of the coaxial light source 151, the ultraviolet light source 152, and the multi-partition light source 153 can achieve a variety of lighting modes and effects, which are suitable for different scenes and needs, thereby improving work efficiency. The light source group structure arranged in sequence along the direction away from the lens of the large field of view camera 130 makes maintenance and replacement of light bulbs more convenient, reducing maintenance costs. In addition, the types of electronic product appearance defects detected are increased, and the detection capability of the electronic product appearance defect detection system 100 is improved.

[0048] Reference Figure 1 and Figure 2 In one embodiment, the ultraviolet light source 152 is an annular light source. As a result, due to the special shape of the annular light source, it can provide uniform illumination and ensure uniform brightness distribution on the surface of the illuminated object. The annular light source can produce a light effect similar to that of a natural environment and can simulate the spectral distribution of sunlight or natural light, making the photographed or observed objects more realistic. The annular light source is relatively flexible and suitable for different scenarios and uses. In addition, the annular ultraviolet light source 152 can more accurately detect defects such as residual glue and overflow glue on electronic products.

[0049] Reference Figure 1 and Figure 2In one embodiment, the inner diameter of the ultraviolet light source 152 is larger than the radius of the light-emitting surface of the coaxial light source 151, so that the ultraviolet light source 152 and the coaxial light source 151 may be prevented from interfering with each other and affecting the lighting effect. By designing the inner diameter of the ultraviolet light source 152 to be larger than the radius of the light-emitting surface of the coaxial light source 151, it can be ensured that they do not interfere with each other during lighting, thereby improving the overall lighting effect. Since the inner diameter of the ultraviolet light source 152 is larger, the irradiation range and intensity of the ultraviolet light emitted by it can be increased. The radius of the light-emitting surface of the coaxial light source is smaller, and the light emitted by it is relatively concentrated. By designing the inner diameter of the ultraviolet light source 152 to be larger than the radius of the light-emitting surface of the coaxial light source 151, the light emitted by the ultraviolet light source 152 can cover the irradiated object more evenly, thereby improving the uniformity of lighting. By designing the inner diameter of the ultraviolet light source 152 to be larger than the radius of the light-emitting surface of the coaxial light source 151, the visual overlap or interference between the ultraviolet light source 152 and the coaxial light source 151 can be avoided, thereby providing a better visual effect.

[0050] Reference Figure 1 and Figure 2 In one embodiment, the inner circle of the ultraviolet light source 152 is the circumscribed circle of the field of view of the large field of view camera 130, so that the illumination range of the ultraviolet light source 152 can be completely matched with the field of view of the large field of view camera 130. This can avoid the waste of the illumination range and ensure that the camera can capture a complete image of the illuminated object. By circumscribing the inner circle of the ultraviolet light source 152 with the camera field of view, it can be ensured that the light emitted by the light source can irradiate the object in the camera field of view to the greatest extent. This can improve the efficiency of lighting and enable the camera to capture more details and information. By circumscribing the inner circle of the ultraviolet light source 152 with the camera field of view, the illumination light can be more evenly distributed on the surface of the object. This can enhance the visual effect and make the surface of the object look smoother and more delicate. Since the inner circle of the ultraviolet light source 152 is circumscribing the camera field of view, the interference of light on the camera lens can be reduced. This can avoid the glare or ghosting phenomenon caused by light on the lens surface and improve the imaging quality.

[0051] Reference Figure 1 and Figure 2In one embodiment, the multi-partition light source 153 is an annular light source, and the inner diameter of the multi-partition light source 153 is larger than the outer diameter of the ultraviolet light source 152. In this way, the multi-partition light source 153 is designed to be annular, which can provide wider and more uniform lighting. By designing the inner diameter of the multi-partition light source 153 to be larger than the outer diameter of the ultraviolet light source 152, the lighting effect can be further enhanced, so that the illuminated object is illuminated more brightly and evenly. The annular design of the multi-partition light source 153 can provide a more uniform and soft light distribution, so that the surface of the illuminated object looks smoother and more delicate. At the same time, by designing the inner diameter of the multi-partition light source 153 to be larger than the outer diameter of the ultraviolet light source 152, the light interference between the two can be avoided, and the visual effect can be further enhanced. The design of the annular multi-partition light source 153 can make the light more concentrated and improve the lighting efficiency. By designing the inner diameter of the multi-partition light source 153 to be larger than the outer diameter of the ultraviolet light source 152, the light distribution can be further optimized, the waste of light can be reduced, and the overall lighting efficiency can be improved. The design of the annular multi-partition light source 153 makes maintenance and replacement more convenient.

[0052] It should be noted that the multi-zone light source 153 is an optical technology that can achieve precise control of the brightness, color and direction of light by dividing the light source into multiple zones. In addition, the multi-zone light source 153 can be a four-zone light source, a six-zone light source, an eight-zone light source or other multi-zone light sources 153. The specific selection of the multi-zone light source 153 can be made as needed, and this application does not limit this.

[0053] Reference Figure 1 and Figure 2 In one embodiment, the multi-partition light source 153 is a ring light source, and the multi-partition light source 153 includes a plurality of partitions, each of which has the same area, so that the light is evenly distributed in each partition, avoiding the phenomenon that the center of the light source is bright and the surroundings are dark, and improving the overall lighting uniformity. Since the area of ​​each partition is the same, it is easier to achieve independent control of each partition. By adjusting the brightness, color and other parameters of each partition, various complex lighting effects can be easily achieved to meet the needs of different scenes. Since the area of ​​each partition is the same, the light emitted by the light source can be used more efficiently. This can reduce the waste of light, improve lighting efficiency and reduce energy consumption.

[0054] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0055] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0056] In the description of this application, "first feature" or "second feature" may include one or more of the features.

[0057] In the description of the present application, “plurality” means two or more.

[0058] In the description of the present application, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0059] In the description of the present application, “above”, “over” and “above” a first feature to a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0061] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. An electronic product appearance defect detection system (100), characterized in that: include: A machine base (110); A small field of view camera (120) mounted on the base (110); A large-field-of-view camera (130) is arranged spaced apart from the small-field-of-view camera (120) along a first direction; A dome light source (140) is installed below the lens of the small field of view camera (120); A light source group is installed below the lens of the large-field-of-view camera (130), and the light source group includes at least one of a coaxial light source (151), an ultraviolet light source (152), and a multi-partition light source (153).

2. The electronic product appearance defect detection system (100) according to claim 1, characterized in that: The object space resolution of the small field of view camera (120) is P1, where 0 μm / pixel <P1≤5μm / pixel。 3. The electronic product appearance defect detection system (100) according to claim 1, characterized in that: The object space resolution of the large field of view camera (130) is P2, where 0 μm / pixel <P2≤15μm / pixel。 4. The electronic product appearance defect detection system (100) according to any one of claims 1 to 3, characterized in that: The axis of the dome light source (140) and the axis of the lens of the small-field-of-view camera (120) are arranged in a colinear manner.

5. The electronic product appearance defect detection system (100) according to any one of claims 1 to 3, characterized in that: The light source group comprises a coaxial light source (151), an ultraviolet light source (152), and a multi-partition light source (153); the coaxial light source (151), the ultraviolet light source (152), and the multi-partition light source (153) are arranged in sequence along a direction away from a lens of the large-field-of-view camera (130).

6. The electronic product appearance defect detection system (100) according to claim 5, characterized in that: The ultraviolet light source (152) is a ring-shaped light source.

7. The electronic product appearance defect detection system (100) according to claim 6, characterized in that: The inner diameter of the ultraviolet light source (152) is greater than the radius of the light-emitting surface of the coaxial light source (151).

8. The electronic product appearance defect detection system (100) according to claim 7, characterized in that: The inner circle of the ultraviolet light source (152) is the circumscribed circle of the field of view of the large-field-of-view camera (130).

9. The electronic product appearance defect detection system (100) according to claim 6, characterized in that: The multi-partition light source (153) is a ring-shaped light source, and the inner diameter of the multi-partition light source (153) is greater than the outer diameter of the ultraviolet light source (152).

10. The electronic product appearance defect detection system (100) according to claim 5, characterized in that: The multi-partition light source (153) is a ring-shaped light source, and the multi-partition light source (153) comprises a plurality of partitions, each of which has the same area.

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