printed circuit board bore diameter and bore number detector adopting CIS image acquisition
A printed circuit board and image acquisition technology, which is applied in the fields of image processing and computer vision, can solve the problems of complex image acquisition and manufacturing process, strict image registration requirements, and complex manufacturing process of hole inspection machines, and achieve simple installation and low cost. The effect of low and simplified structure
Inactive Publication Date: 2006-12-27
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology
[0003] 1. Expensive: Due to the cost and process requirements of the CCD sensor itself, the price of PCB inspection equipment using CCD sensors on the market is as high as 600,000 yuan or more. This high-priced product makes many PCB manufacturers reduce the inspection equipment as much as possible. Purchase quantity
[0004] 2. The manufacturing process of the image acquisition part of the hole inspection machine is complicated: due to the small field of view of the CCD sensor lens system, the width of the printed circuit board produced is much larger than the width that the lens can cover
Therefore, most of the existing products use dense multi-number CCDs or mobile CCDs for image acquisition, which makes the manufacturing process of the image acquisition part complicated and requires high precision. The general assembly accuracy is required to be around 0.005mm
[0005] 3. Strict requirements for image registration: Some hole inspection machines have strict requirements on the placement of printed circuit boards, and there are even devices that require fixed placement
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[0027] exist figure 1 Among them, the printed circuit board (5) to be detected is placed on the printed circuit board conveying device (1), and is driven by the motor to move along the surface of the conveying belt at a constant speed. The strip-shaped line light source (2) is placed on both sides of the PCB conveying device. Directly below the slit between two adjacent rollers, the PCB printed circuit board is irradiated upwards through the slit, and the light irradiated to the via hole on the circuit board can be received by the CIS image sensor of the image acquisition part (3) through the circuit board, The resulting image is bright, and the place without via holes on the circuit board is dark on the CIS image sensor because there is no light passing through. The brightness information obtained by the CIS image sensor is binarized and compressed for storage. In the memory of the image acquisition part (3), the communication module of the image acquisition part (3) transmit...
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It is a method to access CIS image from real-time on-line printing board verifier. This method substitutes CIS image sensor for OCD image sensor to be used as components of image access and to constitute the printing board verifier. This method is featured with low cost and simple process by employing such printing board verifier.
Description
Technical field [0001] The invention belongs to the technical fields of image processing and computer vision. Background technique [0002] Image processing and computer vision are widely used in the manufacturing industry, especially in product inspection, process monitoring, measurement and assembly tasks. In the production process of printed circuit board (referred to as: PCB), it is a key link to inspect and control product quality. In order to solve the problem of unstable detection quality in manual detection, people have developed a variety of dedicated online quality detection systems. In the current PCB hole inspection machine market, the devices that can be seen generally use different numbers of CCD image sensors, and use non-contact detection methods such as transmitted light to obtain images. For example, the HC-610 produced by Taiwan Yaya Technology adopts CCD image sensor and transmitted light detection method, adopts high-frequency light source, and its ape...
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IPC IPC(8): G01B21/14
Inventor 刘万春朱玉文潘云东裴明恩刘俐
Owner BEIJING INSTITUTE OF TECHNOLOGYGY