An optical detection device

Abstract

The application discloses an optical detection device, and belongs to the technical field of optical detection. The optical detection device comprises a machine body, an imaging assembly installed on the machine body, a light source installed on one side of the imaging assembly, a track installed on the machine body, and a calibration assembly installed on the track. The calibration assembly comprises a calibration column and a gray card. The application can improve the functional integration and detection efficiency of optical automatic detection.

Description

Technical Field

[0001] This application relates to the technical field of optical automatic inspection, and more particularly to an optical inspection device. Background Technology

[0002] In the field of AOI (Automated Optical Inspection) optical inspection equipment, before AOI optical inspection equipment is put into production, the light source needs to be calibrated using a gray card; for 3D inspection equipment, the imaging components also need to be calibrated using the calibration posts of the 3D calibration plate, so as to ensure that the imaging components can accurately acquire the 3D information of the object being inspected.

[0003] Existing calibration boards and gray cards are stored in designated storage cabinets. Before starting the AOI optical inspection equipment, or when the optical system malfunctions and requires recalibration, the necessary calibration cards or gray cards must be retrieved from the designated storage cabinets and placed in the designated positions within the optical inspection equipment. Then, the light source or imaging components are calibrated. After calibration, the calibration cards or gray cards are removed from the optical inspection equipment and returned to the storage cabinets. This series of operations consumes a significant amount of time and manpower, impacting the inspection efficiency of the optical inspection equipment. Utility Model Content

[0004] The purpose of this utility model embodiment is to provide an optical detection device that can solve the above-mentioned problems existing in the prior art.

[0005] To achieve the above objectives, this application adopts the following technical solution: An optical inspection device includes a body, an imaging component mounted on the body, a light source mounted on one side of the imaging component, a track mounted on the body, and a calibration component mounted on the track, the calibration component including a calibration post and a gray card.

[0006] Preferably, the calibration component further includes: Base; Support base, installed on the base; A calibration plate having a calibration surface and mounted on the support base, the calibration surface facing the imaging component, the calibration surface being flush with the track surface of the track; Both the calibration post and the gray card are installed on the calibration surface (120), which facilitates the installation and positioning of the calibration post and the gray card and improves the accuracy of calibration.

[0007] Preferably, the calibration assembly further includes a locking element; the locking element connects the base and the support base; the support base is movably mounted on the base; The locking component has an unlocked state and a locked state; When the locking member is in the unlocked state, the support base can move relative to the base to adjust the levelness of the calibration surface; when the locking member is in the locked state, the locking member locks the base and the support base to prevent the support base from moving relative to the base, thereby achieving leveling of the calibration surface and improving calibration accuracy.

[0008] Preferably, the locking component includes a first connecting fastener and a second connecting fastener; the base is provided with a first locking hole and a second locking hole arranged at intervals, and the support is provided with a first adjusting hole and a second adjusting hole arranged at intervals. The first adjusting hole and the second adjusting hole are irregularly shaped holes such as slotted holes. The first connecting fastener slides in the first adjusting hole and is detachably connected to the base through the first locking hole. The second connecting fastener slides in the second adjusting hole and is detachably connected to the base through the second locking hole, thereby achieving locking and positioning after leveling.

[0009] Preferably, the calibration component further includes a first positioning pin and a second positioning pin; the base is provided with a first positioning hole and a second positioning hole arranged at intervals, and the support is provided with a third adjustment hole and a fourth adjustment hole arranged at intervals. The third adjustment hole and the fourth adjustment hole are irregularly shaped holes such as waist holes. The first positioning pin is slidably disposed in the third adjustment hole and inserted into the first positioning hole, and the second positioning pin is slidably disposed in the fourth adjustment hole and inserted into the second positioning hole, thereby improving the positioning accuracy of leveling.

[0010] Preferably, the calibration component further includes a first adjusting member and a second adjusting member; the base is provided with a fifth adjusting hole and a sixth adjusting hole arranged at intervals, the first adjusting member is slidably connected to the base through the fifth adjusting hole, the second adjusting member is slidably connected to the base through the sixth adjusting hole, and the support seat abuts against the first adjusting member and the second adjusting member to facilitate leveling.

[0011] Preferably, the calibration plate and the support base together form a receiving groove, and the calibration surface, the calibration post, and the gray card are all located in the receiving groove, thereby protecting the calibration surface, the calibration post, and the gray card.

[0012] Preferably, the calibration component further includes a cover plate; the cover plate is slidably disposed on the support base to cover or move away from the opening of the receiving groove to achieve dust prevention.

[0013] Preferably, the support base is provided with a first sliding groove and a second sliding groove, one side of the cover plate is slidably disposed in the first sliding groove, and the other side of the cover plate is slidably disposed in the second sliding groove, thereby realizing the sliding installation of the cover plate.

[0014] Preferably, the support base is provided with a first magnetic attractor and the cover plate is provided with a second magnetic attractor. When the cover plate covers the opening of the receiving groove, the first magnetic attractor and the second magnetic attractor are attracted to each other, thereby improving the installation stability of the cover plate and preventing the cover plate from falling off accidentally.

[0015] Preferably, the support base is provided with a spring top ball; the spring top ball has a retaining bead, and the cover plate is provided with a retaining groove. When the cover plate covers the opening of the receiving groove, the retaining bead is engaged in the retaining groove, further improving the installation stability of the cover plate.

[0016] Preferably, the cover plate has a first surface facing the receiving groove and a second surface opposite to the first surface, the first surface having a weight-reducing groove, and / or the second surface having a pull groove to facilitate sliding the cover plate.

[0017] Preferably, the calibration plate is provided with a warning label to prevent poor accuracy.

[0018] Preferably, there is at least one calibration post, and the multiple calibration posts are arranged sequentially at intervals along a predetermined straight path with increasing lengths, which facilitates the calibration of the height parameters of the imaging component.

[0019] Preferably, the track includes a first track and a second track, with a circuit board detection area provided between the first track and the second track, and the calibration component is installed on the side of the first track away from the circuit board detection area, or on the side of the second track away from the circuit board detection area; The calibration surface of the calibration plate faces the imaging component, and the calibration surface is flush with the track surface of the first track or the track surface of the second track, thereby improving the installation accuracy of the calibration component and thus improving the detection accuracy of the optical detection equipment.

[0020] The beneficial effects of this application are as follows: The gray card and calibration post of this application are installed on the machine body. By integrating the gray card and calibration post together, the calibration component can accurately calibrate the brightness parameters of the light source and the height parameters of the imaging component, thereby improving the functional integration of optical automatic detection. This application eliminates the steps of removing the gray card and calibration post for installation and removal and returning them to the storage cabinet, avoiding positioning errors caused by repeated installation and removal, and improving the detection efficiency and accuracy of optical automatic detection. This application installs the calibration component on the track. During the calibration of the light source or imaging component using the calibration component, the calibration component does not need to move, avoiding the problem of poor repeatability due to movement or manual operation, which is conducive to improving repeatability and stability of optical detection equipment. Attached Figure Description

[0021] The present application will now be described in further detail with reference to the accompanying drawings and embodiments.

[0022] Figure 1 A schematic diagram of the structure from one perspective of the calibration component; Figure 2 A structural schematic diagram of the calibration component from another perspective; Figure 3 An exploded view of the calibration components; Figure 4 This is a schematic diagram showing the fit between the base, support, and calibration plate. Figure 5 for Figure 4 A partial exploded view; Figure 6 This is a schematic diagram of the cover plate.

[0023] Explanation of reference numerals in the attached figures: 10. Base; 11. Support base; 12. Calibration plate; 13. Calibration post; 14. Gray card; 15. Locking element; 16. First positioning pin; 17. Second positioning pin; 18. First adjusting element; 19. Second adjusting element; 20. Receiving groove; 21. Cover plate; 22. First magnetic suction element; 23. Second magnetic suction element; 24. Spring ball; 25. Warning label; 26. Third connecting fastener; 27. Installation threaded fastener; 100. First locking hole; 101. Second locking hole; 102. First positioning hole; 103. Second positioning hole; 104. Fifth adjusting hole; 105. Sixth adjusting hole; 106. Connecting threaded hole; 110. First adjustment hole; 111. Second adjustment hole; 112. Third adjustment hole; 113. Fourth adjustment hole; 114. First slide groove; 115. Second slide groove; 116. First magnetic groove; 117. Mounting groove; 120. Calibration surface; 150. First connecting fastener; 151. Second connecting fastener; 210. First surface; 211. Second surface; 212. Weight reduction groove; 213. Pulling groove; 214. Second magnetic groove; 215. Card slot. Detailed Implementation

[0024] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this application are further described in detail below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "fixed," "linked," "communicated," "abutting," "clamping," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] Before discussing the exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although the flowcharts describe the operations (or steps) as sequential processes, many of these operations can be performed in parallel, concurrently, or simultaneously. Furthermore, the order of the operations can be rearranged. The process can be terminated when its operation is completed, but it may also have additional steps not included in the figures. The process may correspond to a method, function, procedure, subroutine, subroutine, etc.

[0028] Unless otherwise stated or defined, the term "and / or" as used in this invention includes any and all combinations of one or more of the associated listed items.

[0029] In the field of AOI (Automated Optical Inspection) equipment, with technological advancements and evolving industry demands, the requirements for operational stability, inspection efficiency, and measurement accuracy are becoming increasingly stringent. Therefore, calibration, as a core prerequisite for ensuring the stable, efficient, and accurate operation of AOI optical inspection equipment, is playing an increasingly crucial role.

[0030] Specifically, before AOI optical inspection equipment can be put into production, a series of calibration and verification tasks must be completed using specific tools. Among these, gray cards are used to accurately calibrate the brightness parameters of the light source to ensure the stability and consistency of the light source output under different operating conditions; at the same time, a 3D calibration board is used to calibrate the height parameters of the imaging components to ensure that the imaging components can accurately acquire the three-dimensional information of the object being inspected.

[0031] However, the current calibration system for AOI optical inspection equipment has significant drawbacks. In actual production scenarios, AOI optical inspection equipment is deployed on the production line, while 3D calibration boards and gray cards are stored separately in designated storage cabinets far from the equipment.

[0032] Before starting AOI optical inspection equipment or when recalibrating it due to optical system malfunctions, manual repositioning of 3D calibration boards and gray cards is required multiple times. This calibration process is complex, time-consuming, and inefficient, making the existing process extremely cumbersome. The specific steps are as follows: Workers must first go to a designated storage cabinet, retrieve the required calibration card or gray card, and adjust the equipment's track width to accommodate the calibration requirements. Next, the light source or imaging components are calibrated. After calibration, the calibration card or gray card must be removed from the equipment and returned to the storage cabinet. This series of operations not only consumes a significant amount of time and manpower but is also prone to calibration errors due to human factors, affecting calibration efficiency and accuracy, and consequently impacting the equipment's inspection efficiency and precision.

[0033] Furthermore, since gray cards and calibration plates are high-precision calibration tools, repeated handling and transportation can easily lead to loss, damage, or accuracy abnormalities due to impacts. Existing technologies involve excessive human intervention during calibration, posing a risk of poor repeatability and positioning accuracy due to improper human operation. For ease of description, the up and down directions mentioned below are... Figure 1 Its vertical direction is consistent with the horizontal direction mentioned below. Figure 1 Its left and right directions are consistent.

[0034] like Figures 1 to 6 As shown, this embodiment provides an optical inspection device for visual inspection of circuit boards. The optical inspection device includes a body, an imaging component mounted on the body, a light source mounted on one side of the imaging component, a track mounted on the body, and a calibration component mounted on the track. The calibration component includes a calibration post 13 and a gray card 14.

[0035] The calibration post 13 is a post with a preset height used to calibrate the measurement parameters of the imaging component, such as lens distortion, 3D spatial information, field-of-view stitching accuracy, image sharpness, and point cloud stitching accuracy. The gray card 14 is the color reference for the optical system and can be used to calibrate light source parameters, such as light source brightness, light intensity stability, and light intensity uniformity. Both the calibration post 13 and the gray card 14 are mounted on the calibration surface of the calibration component, thus integrating them together.

[0036] Thus, by integrating the calibration post 13 and gray card 14 of the calibration component onto a single calibration surface, this application improves the functional integration of automatic optical inspection, enabling the optical inspection equipment to accurately calibrate both the light source parameters and the measurement parameters of the imaging component. The calibration component of this application, once installed on the track, eliminates the need for repeated installation and disassembly, omitting the steps of removing the gray card and calibration post / plate for installation and removal, and returning them to the storage cabinet. This avoids positioning errors caused by repeated installation and disassembly, improving the inspection efficiency and accuracy of automatic optical inspection. Calibration plates, gray cards, and calibration posts are valuable, high-precision calibration tools; installing them on the track significantly reduces the risk of material loss and damage or accuracy reduction due to handling. Furthermore, by installing the calibration component on the track, it will not move during calibration using the calibration post and gray card, which helps improve the repeatability of the equipment and thus enhances its stability.

[0037] In one embodiment, the calibration assembly further includes a base 10, a support 11, and a calibration plate 12. The base 10 is mounted on a track, the calibration plate 12 is a 3D calibration plate, and the support 11 is mounted on the base 10 and supports the calibration plate 12. The calibration plate 12 has a calibration surface 120 and is mounted on the support 11. A calibration post 13 and a gray card 14 are both mounted on the calibration surface 120. The gray card 14 is affixed to the calibration surface 120 of the calibration plate 12, such that the calibration plate 12 and the gray card 14 are integrated together.

[0038] In this application, the base 10 is used for mounting on optical inspection equipment, with the calibration surface facing the imaging assembly and flush with the track surface. The support base 11 is used to support the calibration plate 12, calibration posts 13, and gray card 14. The calibration plate 12 has a calibration surface 120 and is mounted on the support base 11 by multiple threaded fasteners 27. The calibration posts 13 are mounted on the calibration surface 120. The calibration plate 12 is the core functional component for height calibration and adjustment of the imaging assembly. The calibration plate 12 is machined to form the calibration surface 120, which is a high-precision surface. There are multiple calibration posts 13, each with a different height. Different calibration posts 13 represent different standard values, which can be adapted to the installation height of the imaging assembly calibrated by different circuit boards. The number of calibration posts can be determined according to the specific scenario, such as one, two, three, four, five, six, etc.

[0039] In one optional embodiment, four calibration posts 13 are arranged at intervals to calibrate and standardize the height of the imaging component. The calibration posts 13 and gray cards 14 are integrated together via a calibration plate 12. The integrated installation of the calibration posts 13 and gray cards 14 can be achieved by mounting the base 10 on the track. The calibration posts 13 and gray cards 14 do not need to be repeatedly installed and disassembled, thus improving the detection efficiency and accuracy of automatic optical inspection.

[0040] Optionally, the calibration assembly also includes a locking element 15.

[0041] The support base 11 is movably mounted on the base 10. After the base 10 is installed on the track, it is fixed relative to the machine body, while the support base 11 can move relative to the base 10. The movable mounting of the support base 11 includes rotating or swinging mounting, and may also include detachable mounting. The following description and accompanying drawings of this application use the example of the support base 11 being swing-mounted on the base 10.

[0042] The support base 11 is movably installed on the base 10. When the base 10 is fixedly installed on the optical inspection equipment, both the left and right sides of the support base 11 can move up and down relative to the base 10.

[0043] The locking member 15 is used to lock the base 10 and the support 11, restricting their relative movement. The locking member 15 connects the base 10 and the support 11, and has both an unlocked and a locked state. The locking member 15 includes threaded fasteners, a latch, and other components. When the locking member 15 is in the unlocked state, the support 11 can swing relative to the base 10 to adjust the level of the calibration surface 120. When the locking member 15 is in the locked state, it locks the base 10 and the support 11 to prevent the support 11 from swinging relative to the base 10. When the calibration assembly needs to be leveled after installation on the optical inspection equipment, the locking member 15 is switched to the unlocked state, and then the level of the calibration surface 120 of the calibration plate 12 is adjusted by swinging the support 11. After leveling is complete, the locking member 15 is switched to the locked state, thereby preventing the support 11 from swinging relative to the base 10 during calibration.

[0044] The base 10 of this application is used to install on the track of the optical inspection equipment, so that the gray card 14 and the calibration plate 12 are indirectly installed on the track. At the same time, the swing of the support 11 is used to achieve leveling and the locking part 15 is used to lock it. Compared with the manual method of repeatedly disassembling and installing the gray card 14 and the calibration plate 12, the gray card 14 and the calibration plate 12 are guaranteed to have stable assembly accuracy, consistent position, and repeatability accuracy is not affected by human operation.

[0045] This application integrates the gray card 14 and the calibration post 13 on the calibration plate 12, enabling the calibration component to accurately calibrate both the brightness parameters of the light source and the height parameters of the imaging component. This improves the functional integration of automatic optical inspection. The gray card 14 and calibration plate 12 are mounted on the optical inspection equipment via the base 10 and the support 11, avoiding the risk of damage to the gray card 14 and calibration plate 12 or affecting the calibration accuracy caused by frequent disassembly and transportation. This application can use the swing of the support 11 relative to the base 10 to achieve the leveling of the gray card 14 and calibration plate 12, which not only has high installation accuracy but also eliminates the steps of removing the gray card 14 and calibration plate 12 for installation and disassembly and returning them to the storage cabinet, thereby improving the detection efficiency and accuracy of automatic optical inspection.

[0046] In one embodiment, the locking member 15 includes a first connecting fastener 150 and a second connecting fastener 151. Both the first connecting fastener 150 and the second connecting fastener 151 are screws, bolts, etc. The base 10 is provided with a first locking hole 100 and a second locking hole 101 spaced apart along a first straight line direction. The support 11 is provided with a first adjusting hole 110 and a second adjusting hole 111 spaced apart along a first straight line direction. Both the first adjusting hole 110 and the second adjusting hole 111 are irregular holes such as slotted holes. The irregular holes such as slotted holes can extend along a second straight line direction perpendicular to the first straight line direction, or they can extend along an arc trajectory perpendicular to the first straight line direction. In the accompanying drawings of this embodiment, the first straight line direction is from left to right, and the second straight line direction is up and down. The first connecting fastener 150 is slidably disposed in the first adjusting hole 110 and detachably connected to the base 10 through the first locking hole 100, and the second connecting fastener 151 is slidably disposed in the second adjusting hole 111 and detachably connected to the base 10 through the second locking hole 101. When the first connecting fastener 150 and the second connecting fastener 151 are not locked, the first connecting fastener 150 slides in the first adjustment hole 110 and the second connecting fastener 151 slides in the second adjustment hole 111, so that the left and right sides of the support base 11 can swing up and down to achieve leveling. After leveling, the first connecting fastener 150 and the second connecting fastener 151 are locked, so that the head of the first connecting fastener 150 and the head of the second connecting fastener 151 abut against the support base 11 to lock the support base 11, and achieve locking and positioning after leveling. The adjustment method is simple and convenient.

[0047] It is understood that the first connecting fastener 150 and the second connecting fastener 151 can be threaded fasteners such as screws and bolts, and the first adjusting hole 110 and the second adjusting hole 111 are threaded holes, so as to realize the threaded connection between the first connecting fastener 150 and the second connecting fastener 151 and the support base 11. By tightening the first connecting fastener 150 and the second connecting fastener 151, the system can switch to the locked state.

[0048] Alternatively, the first connecting fastener 150 and the second connecting fastener 151 can also be locking pins. The first adjusting hole 110 and the second adjusting hole 111 are smooth holes. The locking pin is interference-fitted with the first adjusting hole 110 and the second adjusting hole 111, and the pin head of the locking pin abuts against the support base 11 to achieve locking.

[0049] This application uses the threaded connection between the first connecting fastener 150, the second connecting fastener 151, and the support base 11 as an example for illustration.

[0050] Furthermore, the calibration assembly also includes a first positioning pin 16 and a second positioning pin 17. The base 10 is provided with a first positioning hole 102 and a second positioning hole 103 spaced apart along a first straight line direction. The support 11 is provided with a third adjustment hole 112 and a fourth adjustment hole 113 spaced apart along the first straight line direction. The third adjustment hole 112 and the fourth adjustment hole 113 are irregularly shaped holes such as slotted holes, and both the third adjustment hole 112 and the fourth adjustment hole 113 extend along a second straight line direction. The first positioning pin 16 slides in the third adjustment hole 112 and is inserted into the first positioning hole 102, and the second positioning pin 17 slides in the fourth adjustment hole 113 and is inserted into the second positioning hole 103.

[0051] Because the first connecting fastener 150 and the second connecting fastener 151 are positioned through a threaded engagement, factors such as thread clearance and torque fluctuations can easily lead to positional deviations, typically with an error exceeding 0.1mm, which is insufficient for high-precision applications. This application adds a first positioning pin 16 and a second positioning pin 17. The engagement of the first positioning pin 16 with the first positioning hole 102 and the engagement of the second positioning pin 17 with the second positioning hole 103 achieves precise point-to-point or face-to-face alignment through a precise fit between a cylindrical or conical shape and the workpiece hole, ensuring that the positional error between the support 11 and the base 10 is controlled within 0.01mm. The first positioning pin 16 and the second positioning pin 17 ensure accurate positioning between the support 11 and the base 10 after leveling, guaranteeing the accurate installation position of the calibration plate 12.

[0052] This application improves the positioning accuracy of leveling by having the first positioning pin 16 cooperate with the first positioning hole 102 and the second positioning pin 17 cooperate with the second positioning hole 103. This gives the calibration component advantages such as higher positioning accuracy, stronger stability, more convenient assembly and disassembly efficiency, and lower manufacturing cost, making it suitable for high-precision machining, repetitive assembly and disassembly, and space-constrained scenarios.

[0053] Optionally, the calibration assembly also includes a first adjusting member 18 and a second adjusting member 19. The base 10 is provided with a fifth adjusting hole 104 and a sixth adjusting hole 105 spaced apart along a first straight line, extending from top to bottom through the base 10. The first adjusting member 18 is slidably connected to the base 10 via the fifth adjusting hole 104, and the second adjusting member 19 is slidably connected to the base 10 via the sixth adjusting hole 105. The lower end face of the support base 11 abuts against the first adjusting member 18 and the second adjusting member 19 from top to bottom. By sliding the first adjusting member 18 and the second adjusting member 19 up and down, the left and right ends of the support base 11 are respectively lifted to achieve leveling, thereby facilitating the leveling of the calibration plate 12 and the gray card 14.

[0054] The first adjusting member 18 and the fifth adjusting hole 104 can be either a threaded fit or an interference fit. The second adjusting member 19 and the sixth adjusting hole 105 can also be either a threaded fit or an interference fit. Since a threaded fit offers higher stability, this application uses a threaded fit to install the first adjusting member 18 and the second adjusting member 19.

[0055] In one embodiment, the calibration plate 12 and the support base 11 together form a receiving groove 20, and the calibration surface 120, calibration post 13, and gray card 14 are all located in the receiving groove 20, so as to avoid collision between the imaging components and other parts and the calibration post 13 and gray card 14 when they move, thereby protecting the calibration surface 120, calibration post 13, and gray card 14.

[0056] Furthermore, the calibration assembly also includes a cover plate 21. The cover plate 21 is slidably mounted on the support base 11 to cover or move away from the opening of the receiving groove 20. When the calibration assembly is not in use for a long time, it can prevent dust from the calibration surface 120, calibration post 13, and gray card 14, and can also protect the calibration surface 120, calibration post 13, and gray card 14 from damage such as impact.

[0057] Optionally, the support base 11 is provided with a first sliding groove 114 and a second sliding groove 115. One side of the cover plate 21 is slidably disposed in the first sliding groove 114, and the other side of the cover plate 21 is slidably disposed in the second sliding groove 115, thereby realizing the sliding installation of the cover plate 21.

[0058] Optionally, the support base 11 is provided with a first magnetic attractor 22, and the cover plate 21 is provided with a second magnetic attractor 23. When the cover plate 21 covers the opening of the receiving groove 20, the first magnetic attractor 22 and the second magnetic attractor 23 are attracted together. Specifically, there are four first magnetic attractors 22 and four second magnetic attractors 23, which correspond one-to-one. Two of the second magnetic attractors 23 are arranged near the front end of the cover plate 21 in the forward direction and are spaced apart from left to right. The other two second magnetic attractors 23 are arranged near the rear end of the cover plate 21 in the forward direction and are spaced apart from left to right. By attracting the first magnetic attractor 22 and the second magnetic attractor 23, the installation stability of the cover plate 21 is improved, and the cover plate 21 is prevented from falling off due to equipment vibration or other accidents. When calibration is required, the opening of the receiving groove 20 is opened by applying a certain external force to slide the cover plate 21.

[0059] Furthermore, the support base 11 is provided with a plurality of first magnetic grooves 116, which correspond one-to-one with a plurality of first magnetic attractors 22. The cover plate 21 is provided with a plurality of second magnetic grooves 214, which correspond one-to-one with a plurality of second magnetic attractors 23, thereby realizing the concealed installation of the first magnetic attractors 22 and the second magnetic attractors 23. When the cover plate 21 covers the opening of the receiving groove 20, it can completely abut against the lower end face of the support base 11, thereby improving the sealing effect.

[0060] It is understandable that one of the first magnetic attractor 22 and the second magnetic attractor 23 is a magnet, and the other is a magnet or a metal part that can be attracted by a magnet. When both the first magnetic attractor 22 and the second magnetic attractor 23 are magnets, the magnetic properties of the ends of the first magnetic attractor 22 and the second magnetic attractor 23 that are close to each other are opposite.

[0061] Optionally, the support base 11 has a mounting groove 117, and a spring-loaded ball 24 is provided in the mounting groove 117. The spring-loaded ball 24 has a retaining bead, and the cover plate 21 has a retaining groove 215. When the cover plate 21 covers the opening of the receiving groove 20, the retaining bead is engaged in the retaining groove 215, improving the installation stability of the cover plate 21. Specifically, the spring-loaded ball 24 also has a sleeve and a spring disposed in the sleeve. A part of the retaining bead is located inside the sleeve and abuts against the spring, while the remaining part of the retaining bead is located outside the sleeve and is used to engage in the retaining groove 215. When the cover plate 21 covers the opening of the receiving groove 20, the spring force causes the retaining bead to engage in the retaining groove 215. When the cover plate 21 is removed, an external force is applied to overcome the spring force, causing the retaining bead to engage in the sleeve, thus separating the retaining bead from the retaining groove 215.

[0062] Furthermore, the calibration component can simultaneously employ three engagement methods to position the cover plate 21: the first sliding groove 114 and the second sliding groove 115 sliding with the cover plate 21; the first magnetic suction member 22 and the second magnetic suction member 23 engaging; and the spring top ball 24 engaging with the slot 215. Alternatively, one or two of these engagement methods can be selected to position the cover plate 21. In this embodiment, the simultaneous engagement of the first sliding groove 114, the second sliding groove 115 sliding with the cover plate 21, the first magnetic suction member 22 and the second magnetic suction member 23 engaging, and the spring top ball 24 engaging with the slot 215 serves two purposes: firstly, to ensure proper positioning; and secondly, to increase the sliding resistance of the cover plate 21.

[0063] In one embodiment, the cover plate 21 has a first surface 210 facing the receiving groove 20 and a second surface 211 opposite to the first surface 210. The first surface 210 is opposite to the calibration surface 120. The first surface 210 is provided with a weight reduction groove 212 to reduce the weight of the cover plate 21 and facilitate the sliding of the cover plate 21.

[0064] Optionally, the second surface 211 is provided with a groove 213, which allows fingers to be inserted into the groove 213 when the cover 21 is manually slid, making it convenient to slide the cover 21.

[0065] Optionally, a warning label 25 is provided on the calibration plate 12, and the warning label 25 is affixed to the other surfaces of the calibration plate 12 except for the calibration surface 120. Specifically, in this embodiment, the calibration surface 120 is set downwards, and the warning label 25 is on the upper surface of the calibration plate 12. The warning label 25 contains a warning message prohibiting touching, thereby preventing the calibration surface 120 from being touched or bumped, so as to avoid poor accuracy of the calibration surface 120 and affecting the accuracy of the calibration.

[0066] Furthermore, there is at least one calibration post 13. Multiple calibration posts 13 are arranged sequentially at intervals along a predetermined straight path with increasing length. The predetermined straight path is parallel to the direction of the first straight line. When performing height parameter calibration and adjustment, the imaging component moves along the predetermined straight path to adapt to different circuit boards, facilitating the calibration of the height parameters of the imaging component.

[0067] The track includes a first track mounted on the machine body and a second track mounted on the machine body and sliding relative to the first track. The calibration component is mounted on the side of the first track away from the circuit board detection area via a base 10, or on the side of the second track away from the circuit board detection area, to avoid interference with and impact on the circuit board detection. The optical inspection equipment can adjust the distance between the first and second tracks according to the circuit board dimensions input by the customer.

[0068] In one alternative embodiment, the first track can be a fixed track, and the second track can be a movable track.

[0069] The calibration assembly, which integrates the calibration plate 12 and the gray card 14, is installed behind the first or second track of the optical inspection equipment. The calibration assembly is centered on the left and right sides of the optical inspection equipment, which improves the calibration efficiency.

[0070] In one optional embodiment, a circuit board transmission channel is formed between the first track and the second track, and the middle area of ​​the transmission channel is a circuit board detection area. The calibration component is installed on the side of the first track away from the circuit board detection area, or on the side of the second track away from the circuit board detection area.

[0071] The calibration components are installed in a reasonable position, with the calibration components assembled on the opposite side of the first or second track relative to the detection area, close to the actual detection position of the circuit board, which helps to improve calibration accuracy.

[0072] In downlighting optical inspection equipment, the calibration surface faces downwards and is flush with the track surface, ensuring it does not obstruct the passage of circuit boards and imaging components. When the calibration component is installed on the fixed first track, if the width between the second and first tracks needs to be adjusted due to switching different circuit boards, the calibration component can remain stationary, and the accuracy will not be affected by the movement of the second track. Furthermore, with the calibration surface facing downwards, dust accumulation is less likely, and the calibration component's proximity to the front door of the machine facilitates maintenance.

[0073] Optionally, the optical inspection equipment also includes a third connecting fastener 26. The base 10 is provided with a connecting threaded hole 106 that can be detachably connected to the third connecting fastener 26. The base 10 is mounted on the first or second track via the third connecting fastener 26, thereby improving the installation efficiency of the calibration components.

[0074] The calibration surface 120 of the calibration plate 12 can be set downwards or upwards. The calibration surface 120 is flush with the track surface of the track, that is, the calibration surface 120 is flush with the track surface of the first track or the track surface of the second track. The track surface is the working surface on the track that directly contacts the circuit board and supports the circuit board and guides its movement.

[0075] Furthermore, the calibration component of this application can be installed on a fixed first track or a movable second track. When the optical inspection equipment is an upward-illuminated or downward-illuminated device, the calibration component can be detachably installed on the fixed track, and the fixed track will not move due to track width adjustments, which is beneficial to improving repeatability accuracy. The calibration component can also be detachably installed on a movable track. In this case, during calibration, the movable track can be moved close to the fixed track without occupying the measurement stroke of the imaging component.

[0076] Optionally, for optical inspection equipment that performs simultaneous inspection from top to bottom, the calibration plate 12 can be double-sided, that is, two calibration plates 12 with one calibration surface 120 are integrated into a double-sided calibration component. The two calibration surfaces 120 of the double-sided calibration component are set facing up and down respectively. The double-sided calibration plate 12 is installed on the first track or the second track, or one calibration plate 12 is installed on the first track and the second track respectively.

[0077] In one embodiment, the optical inspection equipment is a double-sided inspection equipment. When performing simultaneous inspection of both sides of a double-sided circuit board, i.e., an imaging component is set above the track and another imaging component is set below the track, the calibration component can be a double-sided calibration part. That is, the double-sided calibration part shares a base, support, and calibration plate. The calibration plate has calibration surfaces on both sides facing the imaging component, and calibration posts and gray cards are installed on the calibration surfaces. The double-sided calibration part is used to complete the calibration of the double-sided inspection equipment without disassembling or installing the calibration component. The double-sided calibration part can be fixed on a fixed track or a moving track. The calibration component can be detachably installed on the fixed track, and the fixed track will not move due to track width adjustments, thus improving repeatability accuracy. The double-sided calibration part can be detachably installed on the moving track without occupying the measurement stroke of the imaging component. Moreover, compared with a single-sided calibration component, the double-sided calibration part occupies less space, improving the space utilization of the optical inspection equipment. Optionally, the calibration of the double-sided inspection device can also be performed using two single-sided calibration components. One single-sided calibration component faces the upper imaging component, and the other single-sided calibration component faces the lower imaging component. The two single-sided calibration components can be set on the same track, which can be a fixed track or a moving track. Alternatively, the two single-sided calibration components can be set on different tracks.

[0078] Furthermore, the calibration surface 120 of the calibration plate 12 is positioned downwards to prevent dust accumulation. The calibration surface 120 is flush with the track surface of the first track or the track surface of the second track, which facilitates positioning and avoids the problem of poor repetitive positioning accuracy caused by improper operation. It is particularly suitable for occasions where products to be tested are frequently changed and optical systems are calibrated periodically, thereby improving the installation accuracy of calibration components and thus improving the detection accuracy of optical testing equipment.

[0079] The automatic optical inspection and calibration method for the optical inspection equipment in this embodiment includes the following steps: When calibrating the brightness parameters of the light source: S11, Moving the image: Click the imaging movement button on the software of the optical inspection device. The optical inspection device drives the imaging component to move to the calibration surface 120 of the alignment calibration plate 12, ensuring that the FOV of the imaging component is completely on the gray card 14.

[0080] S12, Take a picture: Start the light source and imaging component, click the software of the optical inspection device, so that the imaging component takes a picture of the gray card 14 on the calibration surface 120.

[0081] S13, Adjust RGB values: Compare the RGB values ​​obtained from the photo with the range of standard values. If there is a difference, adjust the light source brightness until the RGB values ​​obtained from the photo are within the range of standard values.

[0082] When calibrating the height of the imaging component: S21, Moving the image: Click the imaging movement button in the software of the optical inspection device. The optical inspection device drives the imaging component to move to the calibration surface 120 of the alignment calibration plate 12, ensuring that the FOV of the imaging component is completely on the calibration surface 120.

[0083] S22, Take a picture: Start the light source and imaging component, click the software of the optical inspection device, so that the imaging component takes a picture of the calibration surface 120.

[0084] S23, Adjust projection brightness value: Compare the projection brightness value obtained by taking a picture with the range of the standard value. If there is a difference, adjust the projection brightness value to the range of the standard value.

[0085] S24, Adjust projection clarity: Obtain the projection clarity of the captured image. If the projection clarity does not meet the standard clarity, use the projection knob to adjust the projection clarity to the standard clarity state.

[0086] Click the calibration button in the calibration software and wait for the calibration to complete. Next, use the calibration column to perform calibration verification.

[0087] In steps S21 to S23, drive the imaging component to the 0 plane (i.e., the calibration surface 120 of the calibration plate 12), click the capture image button in the software, and check the LB, RB, RF, and LF values. The range should be between 120 and 130. If the range is not within this range, the value of the projection brightness control area needs to be adjusted.

[0088] In S24, when adjusting the projection sharpness, select grayscale in the image frame. The image position will switch to grayscale. Then, zoom in on the stripes on the image page, loosen the four fastening screws of the projector, and adjust the focus by turning the lens at the end of the projector. After the projector is focused to its sharpest state, turn the lens clockwise to adjust it until the grid pattern disappears.

[0089] After completing the sharpness adjustment, a projection confidence test is performed. The projection confidence test is used to verify the focus quality of the projection, and this step is performed before projection calibration. The projection confidence test process is as follows: First, click the "Verification" module; then click the "Projection Confidence Test" button; next, click the Run button; finally, check the result values ​​displayed on the interface, ensuring that the result value for each projection is not lower than 70 to 75.

[0090] S25, Imaging Movement: Click the imaging movement button on the software to drive the imaging component to move and align with calibration post 13, ensuring that the FOV center of the imaging component coincides with the center of calibration post 13. During this process, the camera of the imaging component is moved to the calibration surface of the calibration plate, and the projection calibration is performed by moving the Z-axis of the imaging component.

[0091] S26, 3D height calibration: Click the calibration button on the software of the optical inspection equipment to start the imaging component to take pictures of the calibration column 13 at multiple different heights, obtain the corresponding height value of each calibration column 13 and compare it with the range of the standard value. If it is not within the range of the standard value, reinstall the imaging component to adjust the position of the imaging component until the height value is within the range of the standard value.

[0092] When calibrating the 3D height, the lower limit is the default parameter, the step size can be modified to 500, and the number of photos taken is 8. Click the "New Calibration" button and wait for the algorithm to run. If black edges appear in the projection during the downward movement of the imaging component, the number of photos taken can be reduced appropriately, but it cannot be less than 5.

[0093] After calibration, the results need to be checked. For each projection plane, the flatness value in the second column should be less than 10, and the absError value in the third column should be within ±1% for a pass; otherwise, it should be NG. After passing, you can click to overwrite the calibration file and output a new configuration.

[0094] The technical principles of this application have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this application and should not be construed as limiting the scope of protection of this application in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this application without inventive effort, and these embodiments will all fall within the scope of protection of this application.

Claims

1. An optical inspection device, characterized in that, It includes a body, an imaging component mounted on the body, a light source mounted on one side of the imaging component, a track mounted on the body, and a calibration component mounted on the track. The calibration component includes a calibration post (13) and a gray card (14).

2. The optical inspection device according to claim 1, characterized in that, The calibration component also includes: Base (10), mounted on the track; A support base (11) is installed on the base (10); A calibration plate (12) having a calibration surface (120) and mounted on the support base (11) has the calibration surface (120) facing the imaging assembly and is flush with the track surface of the track. The calibration post (13) and the gray card (14) are both installed on the calibration surface (120).

3. The optical inspection device according to claim 2, characterized in that, The calibration assembly also includes a locking member (15) connecting the base (10) and the support (11); the support (11) is movably mounted on the base (10); The locking member (15) has an unlocked state and a locked state; When the locking member (15) is in the unlocked state, the support base (11) can move relative to the base (10) to adjust the level of the calibration surface (120); when the locking member (15) is in the locked state, the locking member (15) locks the base (10) and the support base (11) to prevent the support base (11) from moving relative to the base (10).

4. The optical inspection device according to claim 3, characterized in that, The locking component (15) includes a first connecting fastener (150) and a second connecting fastener (151); the base (10) is provided with a first locking hole (100) and a second locking hole (101) spaced apart, and the support base (11) is provided with a first adjusting hole (110) and a second adjusting hole (111) spaced apart. The first adjusting hole (110) and the second adjusting hole (111) are both irregularly shaped holes. The first connecting fastener (150) slides in the first adjusting hole (110) and is detachably connected to the base (10) through the first locking hole (100). The second connecting fastener (151) slides in the second adjusting hole (111) and is detachably connected to the base (10) through the second locking hole (101).

5. The optical inspection device according to claim 4, characterized in that, The calibration assembly also includes a first positioning pin (16) and a second positioning pin (17); the base (10) is provided with a first positioning hole (102) and a second positioning hole (103) arranged at intervals, and the support base (11) is provided with a third adjustment hole (112) and a fourth adjustment hole (113) arranged at intervals. The third adjustment hole (112) and the fourth adjustment hole (113) are both irregular holes. The first positioning pin (16) slides in the third adjustment hole (112) and is inserted into the first positioning hole (102), and the second positioning pin (17) slides in the fourth adjustment hole (113) and is inserted into the second positioning hole (103).

6. The optical inspection device according to claim 4, characterized in that, The calibration assembly also includes a first adjusting member (18) and a second adjusting member (19); the base (10) is provided with a fifth adjusting hole (104) and a sixth adjusting hole (105) arranged at intervals, the first adjusting member (18) is slidably connected to the base (10) through the fifth adjusting hole (104), the second adjusting member (19) is slidably connected to the base (10) through the sixth adjusting hole (105), and the support base (11) abuts against the first adjusting member (18) and the first adjusting member (19).

7. The optical inspection device according to any one of claims 2 to 6, characterized in that, The calibration plate (12) and the support base (11) together form a receiving groove (20), and the calibration surface (120), the calibration column (13), and the gray card (14) are all located in the receiving groove (20).

8. The optical inspection device according to claim 7, characterized in that, The calibration assembly also includes a cover plate (21); the cover plate (21) is slidably disposed on the support base (11) to cover or move away from the opening of the receiving groove (20).

9. The optical inspection device according to claim 8, characterized in that, The support base (11) is provided with a first sliding groove (114) and a second sliding groove (115). One side of the cover plate (21) is slidably disposed in the first sliding groove (114), and the other side of the cover plate (21) is slidably disposed in the second sliding groove (115). And / or, The support base (11) is provided with a first magnetic suction member (22), and the cover plate (21) is provided with a second magnetic suction member (23). When the cover plate (21) covers the opening of the receiving groove (20), the first magnetic suction member (22) and the second magnetic suction member (23) are attracted together. And / or, The support base (11) is provided with a spring top ball (24); the spring top ball (24) has a retaining bead, and the cover plate (21) is provided with a retaining groove (215). When the cover plate (21) covers the opening of the receiving groove (20), the retaining bead is engaged in the retaining groove (215).

10. The optical inspection device according to claim 8, characterized in that, The cover plate (21) has a first surface (210) facing the receiving groove (20) and a second surface (211) opposite to the first surface (210), the first surface (210) being provided with a weight-reducing groove (212), and / or the second surface (211) being provided with a pull groove (213).

11. The optical inspection apparatus according to any one of claims 1 to 6, characterized in that, The track includes a first track and a second track, with a circuit board detection area between the first track and the second track. The calibration component is installed on the side of the first track away from the circuit board detection area, or on the side of the second track away from the circuit board detection area.

Images