A method of dispensing quality inspection based on machine vision
A machine vision and dispensing technology, applied in instruments, weighing, measuring devices, etc., can solve the problems of low efficiency, high cost, and difficulty in realizing online measurement, and achieve the effect of high processing efficiency.
Active Publication Date: 2015-10-14
HUAZHONG UNIV OF SCI & TECH
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[0005] Aiming at the shortcomings of the existing glue drop detection schemes, such as low efficiency, high cost, and difficulty in realizing online measurement, the present invention proposes a machine vision-based glue dispensing quality detection method, which has high detection efficiency and good real-time performance
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[0040] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0041] figure 1 Shown is the flow chart of dispensing quality detection in this embodiment, which mainly includes the following four steps: obtaining the image of the pad before and after dispensing; image processing, extracting the image of the glue drop; obtaining the quality parameters of the glue drop dispensing; using the dispensing model Get the dispensing mass.
[0042] figure 2 Shows the specific flow of the image processing of the dispensing measurement algorithm, which includes: 101. Obtain the images of the pads before and after dispensing; 102. Perform gamma correction on the background image of the pads; 103. Image difference to obtain a differential image;...
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The invention discloses a machine vision-based dispensing quality detection method. The method comprises the following steps: obtaining bonding pad images before and after a dispensing operation; utilizing an image processing algorithm to carry out processing on the two images, eliminating a background interference and extracting a glue drop image; utilizing a Blob analyzing algorithm to solve dispensing parameters, including a glue drop area, a center point coordinate and a shape factor, of the glue drop; and solving a dispensing quality of the glue drop according to a dispensing quality evaluation model. And the dispensing quality of the glue drop is compared with a threshold value to determine whether the dispensing quality is qualified or not. According to the invention, the method can be effectively applied to dispensing consistency detection and dispensing quality detection during the high-speed high-frequency dispensing process with complex background images.
Description
technical field [0001] The invention belongs to the technical field of electronic packaging, and in particular relates to a machine vision-based glue dispensing quality detection method. Background technique [0002] In the process of electronic packaging, in many working conditions, it is necessary to apply organic glue to the substrate and then mount the chip. In order to ensure the accuracy of dispensing and placement, the vision system is widely used in the process of dispensing and placement, using visual matching and other techniques to compensate for motor movement. In addition to satisfying positioning accuracy, the gluing process also requires high-frequency and high-consistency performance. If the amount of glue dispensed is too small, the chip may be unstable and fall off when attached to the pad, resulting in an increase in defective products. Too much glue will not only waste glue, but too much glue will cure slowly and affect the quality of placement. will al...
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IPC IPC(8): G01G17/04
Inventor 陈建魁尹周平郭熙乾唐奕斐梅爽
Owner HUAZHONG UNIV OF SCI & TECH