An on-line resin plug detection device

Abstract

The utility model discloses a kind of online resin hole-plugging detection devices, including rack, conveying device being located at the rack, first camera unit and second camera unit being located at the conveying device upper and lower sides, and first light source and second light source respectively being located at the conveying device upper and lower sides, sensor for detecting circuit board in-place signal, and control device;The conveying device includes several interval distribution strip-shaped conveyer belt, wellhead intermittently formed by the strip-shaped conveyer belt, glass platform being located at the wellhead, friction wheel group being located at the glass platform inlet end and discharge end and being used to clamp circuit board, and servo motor for driving the friction wheel group;The sensor is electrically connected with the control device, the control device is electrically connected with first camera unit and second camera unit, and the first camera unit and second camera unit are synchronously scanned circuit board under control.The utility model discloses an online resin hole-plugging detection device, can carry out online detection to circuit board double side simultaneously, and detection efficiency is high.

Description

Technical Field

[0001] This utility model relates to the field of circuit board manufacturing technology, specifically to an online resin plugging detection device. Background Technology

[0002] Resin-filled via technology is widely used in high-end electronic manufacturing fields such as high-density interconnect (HDI) boards, thick copper boards, and BGA packages. Its quality directly affects the reliability and performance of products. Traditional inspection methods mainly rely on manual visual inspection or CPU-based 2D optical inspection systems. Manual inspection involves observing the via filling status with a microscope or magnifying glass to identify defects such as bubbles and missing vias. This method suffers from low inspection efficiency and high subjectivity. The results are affected by the operator's experience, have poor repeatability, and are difficult to meet the needs of mass production. Automated inspection systems use conventional image processing algorithms (such as threshold segmentation and edge detection) to perform a rough analysis of the via contour. Existing automated inspections typically inspect only one side of the circuit board, requiring two inspections before the quality of the resin-filled vias can be determined, resulting in low inspection efficiency.

[0003] Therefore, the purpose of this utility model is to provide a resin plugging detection device with high detection efficiency to solve the above-mentioned technical problems. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide an online resin plugging detection device that can simultaneously perform online detection on both sides of the circuit board with high detection efficiency.

[0005] The technical solution of this utility model is:

[0006] An online resin plugging detection device includes a frame, a conveying device disposed on the frame, a first camera unit and a second camera unit disposed above and below the conveying device, a first light source and a second light source disposed on the upper and lower sides of the conveying device respectively, a sensor for detecting circuit board positioning signals, and a control device.

[0007] The conveying device includes several spaced strip conveyor belts, wellheads formed intermittently by the strip conveyor belts, a glass platform located at the wellhead, friction wheel sets located at the inlet and outlet ends of the glass platform for clamping circuit boards, and a servo motor for driving the friction wheel sets. The upper surface of the glass platform is on the same plane as the upper surface of the strip conveyor belts.

[0008] The first camera unit includes a first line scan camera, which is disposed above the glass platform; the second camera unit includes a second line scan camera, which is disposed below the glass platform.

[0009] The first light source includes a first coaxial light source disposed above the glass platform, a first strip light source disposed on opposite sides of the frame and close to the glass platform in the vertical direction, and a first ring light source disposed above the glass platform;

[0010] The second light source includes a second coaxial light source disposed below the glass platform, a second strip light source disposed on opposite sides of the frame and close to the glass platform in the vertical direction, and a second ring light source disposed below the glass platform;

[0011] The sensor is electrically connected to the control device, which is electrically connected to the first line scan camera and the second line scan camera, and controls the first line scan camera and the second line scan camera to scan the circuit board synchronously.

[0012] Furthermore, the first line scan camera and the second line scan camera are color line scan cameras.

[0013] Furthermore, the first line-distance camera and the second line-distance camera are symmetrically distributed on both sides of the glass platform.

[0014] Furthermore, the glass platform is made of quartz glass or tempered glass.

[0015] Compared with the prior art, the online resin plugging detection device provided by this utility model has the following advantages:

[0016] I. The online resin plugging detection device provided by this utility model, by setting a glass platform on the conveying device, and by setting a first camera unit and a second camera unit, as well as a first light source and a second light source on the upper and lower sides of the glass platform, enables simultaneous scanning and inspection of both sides of the circuit board, thereby improving the detection efficiency. Both the first and second light sources include coaxial light sources, strip light sources, and ring light sources, providing different light sources from multiple angles, which can improve image quality and thus enhance the reliability of detection and analysis. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the online resin plugging detection device of this utility model;

[0019] Figure 2 yes Figure 1 The diagram shows the structure of the conveying device in the online resin plugging detection device.

[0020] Figure 3 This is a diagram showing the detection effect of the online resin plugging detection device of this utility model.

[0021] Specific implementation methods

[0022] To enable those skilled in the art to better understand the technical solutions in the embodiments of this utility model, and to make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be further described below.

[0023] The endpoints and any values ​​of the ranges disclosed herein are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed herein.

[0024] Please see Figure 1 This is a schematic diagram of the online resin plugging detection device of this utility model. The online resin plugging detection device of this utility model includes a frame 1, a conveying device 2 disposed on the frame, a first camera unit 3 and a second camera unit 4 disposed above and below the conveying device, a first light source 5 and a second light source 6 disposed on the upper and lower sides of the conveying device respectively, a sensor 7 for detecting the circuit board's arrival signal, and a control device (not shown). The first camera unit 3 and the second camera unit 4 are used to perform online scanning of the upper and lower surfaces of the circuit board, respectively. The first light source 5 and the second light source 6 provide light sources for the first camera unit and the second camera unit, respectively, so that the image is clearer when the camera scans.

[0025] Please refer to the following: Figure 2 ,yes Figure 1 The diagram shows the structure of the conveying device in the online resin plugging detection device. The conveying device 2 is used to transport the circuit board to the detection position and can be a belt conveyor mechanism. In this embodiment, the conveying device 2 includes several spaced strip conveyor belts 21 and a glass platform 22. At the detection position, the strip conveyor belts are discontinuous, with an opening 23 formed at the discontinuity. The glass platform 22 is located at the opening, and its two sides are connected to the strip conveyor belts 21, allowing the circuit board to continue being transported to the discharge section after passing through the glass platform under power. In other words, the strip conveyor belts can be divided into an infeed section 211 and a discharge section 212, with the glass platform as the boundary.

[0026] In this embodiment, the glass platform 22 is a fixed platform, and its upper surface is on the same plane as the upper surface of the strip conveyor belt 21. The glass platform 22 is made of quartz glass or tempered glass. To ensure that the circuit board moves at a uniform speed on the glass platform and to make the scanning of the first camera unit and the second camera unit more accurate, friction wheel sets 24 for clamping the circuit board are respectively provided at the inlet and outlet ends of the glass platform 22. The friction wheel sets are driven by a servo motor (not shown). Specifically, the friction wheel set 24 includes a friction wheel 241 and an upper pressure wheel 242 located directly above the friction wheel 241. The servo motor drives the friction wheel 241 to rotate, and the upper pressure wheel 242 is a driven wheel. By adjusting its downward pressure, the friction wheel and the upper pressure wheel clamp the circuit board. The circuit board is conveyed forward in the clamped state and enters the outlet section of the conveying device after passing through the glass platform.

[0027] The first camera unit 3 includes a first line scan camera 31, which is positioned above the glass platform and used for online scanning of the upper surface of the circuit board. The second camera unit 4 includes a second line scan camera 41, which is positioned below the glass platform and used for online scanning of the lower surface of the circuit board. In this embodiment, the first line scan camera 31 and the second line scan camera 41 are color line scan cameras and are symmetrically distributed on both sides of the glass platform, so that the images captured by the cameras on both sides of the glass platform are synchronized in position. Furthermore, to ensure the synchronization of the images captured by the first camera unit 3 and the second camera unit 4, they are controlled by a control device 8.

[0028] Sensor 7 is used to detect whether the circuit board has reached the detection position and sends the detection signal to the control device. When the circuit board is detected to have reached the designated position, the control device controls the servo motor of the friction wheel assembly to work, clamping the circuit board to the glass platform, and controls the first and second line scan cameras to perform online scanning. In this embodiment, sensor 7 is a photoelectric through-beam sensor.

[0029] The first light source 5 includes a first coaxial light source (unlabeled) positioned above the glass platform 22, a first strip light source 52 positioned on opposite sides of the frame and vertically close to the glass platform, and a first ring light source 53 positioned above the glass platform. The second light source 6 includes a second coaxial light source (unlabeled) positioned below the glass platform, a second strip light source 62 positioned on opposite sides of the frame and vertically close to the glass platform, and a second ring light source 63 positioned below the glass platform. The first and second coaxial light sources are integrated into the vision modules of their respective line scan cameras. The coaxial light source is parallel to the camera's optical axis and is used to detect whether the surface depression of the plugged hole meets the standards, whether there are any defects such as incomplete plugging or voids. The strip light source illuminates from the side, highlighting the height difference between the hole edge and the resin surface, and is used to detect resin overflow issues. The ring light source provides overall illumination and is used to check for defects such as dirt and uneven color on the circuit board surface.

[0030] The online resin plugging detection device of this invention achieves the following detection results: Figure 3 As shown. By Figure 3 As can be seen, the online resin plugging detection device of this utility model acquires clear images and provides reliable detection results.

[0031] The embodiments of this utility model have been described in detail above, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and spirit of this utility model still fall within the protection scope of this utility model.

Claims

1. An online resin plugging detection device, characterized in that, It includes a frame, a conveying device disposed on the frame, a first camera unit and a second camera unit disposed above and below the conveying device, a first light source and a second light source disposed on the upper and lower sides of the conveying device respectively, a sensor for detecting the circuit board arrival signal, and a control device. The conveying device includes several spaced strip conveyor belts, wellheads formed intermittently by the strip conveyor belts, a glass platform located at the wellhead, friction wheel sets located at the inlet and outlet ends of the glass platform for clamping circuit boards, and a servo motor for driving the friction wheel sets. The upper surface of the glass platform is on the same plane as the upper surface of the strip conveyor belts. The first camera unit includes a first line scan camera, which is disposed above the glass platform; the second camera unit includes a second line scan camera, which is disposed below the glass platform. The first light source includes a first coaxial light source disposed above the glass platform, a first strip light source disposed on opposite sides of the frame and close to the glass platform in the vertical direction, and a first ring light source disposed above the glass platform; The second light source includes a second coaxial light source disposed below the glass platform, a second strip light source disposed on opposite sides of the frame and close to the glass platform in the vertical direction, and a second ring light source disposed below the glass platform; The sensor is electrically connected to the control device, which is electrically connected to the first line scan camera and the second line scan camera, and controls the first line scan camera and the second line scan camera to scan the circuit board synchronously.

2. The online resin plugging detection device according to claim 1, characterized in that, The first and second line scan cameras are color line scan cameras.

3. The online resin plugging detection device according to claim 2, characterized in that, The first line-distance camera and the second line-distance camera are symmetrically distributed on both sides of the glass platform.

4. The online resin plugging detection device according to claim 1, characterized in that, The glass platform is made of quartz glass or tempered glass.

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