Novel device and method for detecting defects of flexible circuit boards
A flexible circuit board and defect detection technology, which is applied in the direction of optical defect/defect detection, can solve the problems of high AOI false alarm rate, lack of human identification and fault tolerance, time-consuming and other problems, and achieve convenient operation, convenient installation, The effect of improving accuracy
Inactive Publication Date: 2014-01-01
SOUTH CHINA UNIV OF TECH
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Problems solved by technology
[0005] Although AOI inspection can replace traditional manual inspection for long-term, high-precision circuit board defect detection, because there is no strict identicalness between the circuit board to be tested and the standard circuit board (standard diagram), and the computer does not currently have It has human identification and fault tolerance capabilities, so AOI has a relatively high false alarm rate in actual production applications
At the same time, it takes a long time to compare a complete picture with the standard picture to find out the dominant defects.
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[0027] The present invention will be further described in detail in conjunction with the accompanying drawings and specific embodiments.
[0028] The circuit boards 2A and 2B to be tested are of the same type, and are sent to the detection platform 6 via the conveyor belt 3 and fixed. The cameras 1A and 1B are fixed by a distance-adjustable connecting rod 7, and the connecting rod 7 translates in a plane parallel to the plane of the circuit board to be tested through an XY-axis motion platform. The XY-axis motion platform includes an X-axis guide rail 4 and a Y-axis guide rail 5. The X-axis guide rail 4 is set along the X-axis direction (that is, the conveying direction of the conveyor belt 3), and the Y-axis guide rail 5 is arranged along the Y-axis direction (that is, parallel to the circuit board to be tested). In the plane of the upper plane, the direction perpendicular to the X-axis) is set. The X-axis guide rail and the Y-axis guide rail are driven by motors. The camer...
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The invention relates to a novel device for detecting defects of flexible circuit boards. The novel device comprises a control system, a detecting platform and a conveyor belt for conveying circuit boards to be detected, and further comprises an XY-axis moving platform and two cameras arranged in the X-axis direction; two circuit boards to be detected are sequentially and horizontally placed on the conveyor belt arranged in the X-axis direction; the conveyor belt is mounted on the detecting platform; the two cameras do translational movement through the XY-axis moving platform while directly facing the upper planes of the circuit boards to be detected; one camera corresponds to one circuit board. The invention further relates to a novel method for detecting defects of the flexible circuit boards. The novel device and method have the advantage of high-efficiency and accurate detection, and belongs to the technical field of visual detection of circuit boards.
Description
technical field [0001] The invention relates to the visual detection technology of circuit boards, in particular to a device and method for circuit board defect detection. Background technique [0002] Printed circuit boards are the main components for electrical connections in electronic products, but due to various possible errors in the production process, there are various obvious defects on the circuit board such as short circuits, open circuits, rat bites, residual copper, scratches, etc. Sexual defects. These defects may seriously affect the performance and stability of the product, so the defect detection link of the circuit board is extremely important. [0003] The traditional manual detection method mainly uses high-magnification microscopes to detect defects by using people's own identification and analysis capabilities. However, this method has the characteristics of high missed detection rate, slow speed, and high cost. In terms of reliability, the traditiona...
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Inventor 陈安胡跃明何继贤吴忻生
Owner SOUTH CHINA UNIV OF TECH