Method for detecting quality of inner wall of via hole of PCB

A detection method and quality technology, which can be used in measurement devices, material analysis by optical means, image data processing, etc., can solve the problems of inability to guarantee the quality of PCB products and inability to detect the inner wall of via holes.

Active Publication Date: 2015-07-08
ZHEJIANG OULONG ELECTRIC
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  • Claims
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AI Technical Summary

Problems solved by technology

[0006] In order to overcome the shortcomings of the existing PCB detection methods that cannot detect the quality of the inner wall of the via hole and cannot guarantee the quality of PCB products,

Method used

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  • Method for detecting quality of inner wall of via hole of PCB
  • Method for detecting quality of inner wall of via hole of PCB
  • Method for detecting quality of inner wall of via hole of PCB

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Experimental program
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Embodiment Construction

[0051] The present invention will be further described below in conjunction with the accompanying drawings.

[0052] refer to Figure 1 ~ Figure 3 , a kind of detection method of PCB through-hole inner wall quality, described detection method comprises the steps:

[0053] Step 101: Obtain the PCB to be tested and a standard template;

[0054] Step 102: Using terahertz wave imaging technology to collect the original image of the PCB to be tested and the original image of the standard template;

[0055] Step 103: Perform thresholding and denoising processing on the original image of the PCB to be tested and the original image of the standard template to obtain the restored image to be tested and the restored image of the standard template;

[0056] Step 104: Calculate the characteristic functions of the restored image of the standard template and the restored image to be tested respectively, and obtain the center and aperture information of the via hole. The process is as foll...

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Abstract

The invention provides a method for detecting the quality of the inner wall of a via hole of a PCB. The method includes the steps that step101, the PCB to be detected and a standard template are acquired; step102, an original image of the PCB to be detected and an original image of the standard template are collected through a terahertz wave imaging technology; step103, thresholding and denoising are performed on the original image of the PCB to be detected and the original image of the standard template to obtain a recovered image to be detected and a recovered image of the standard template; step104, characteristic functions of the recovered images are calculated to obtain the circle center and diameter information of the via hole; step105, template matching operation is performed on the characteristic information of the recovered image of the standard template and the characteristic information of the recovered image to be detected; step106, if the matching operation result is within a production permissible error range, it is displayed that the PCB is detected to be qualified; step107, if the matching operation result is beyond the production permissible error range, it is displayed that the PCB is detected to be unqualified. By means of the method, the quality of the inner wall of the via hole is effectively detected, and the product quality of the PCB is guaranteed.

Description

technical field [0001] The invention relates to the field of detection methods for printed circuit boards (Printed Circuit Board, PCB), in particular to a detection method for the quality of the inner wall of a PCB via hole. Background technique [0002] Printed Circuit Board (PCB), as a main platform carrying a variety of electronic components, is responsible for connecting electronic components and making them truly a complete functional module. As an indispensable basic component of any electronic product, it has had a huge impact on the electronics industry in the world today. With the rapid development of the electronic industry, people have higher and higher requirements for product quality and stable performance, so the detection method of PCB has become an urgent research topic. [0003] In the existing inspection technology of PCB production, flying probes or special molds are generally used to detect the conduction electrical characteristics of PCB, and automatic ...

Claims

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Application Information

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IPC IPC(8): G01N21/3581G06T7/00
Inventor 刘恺杨力帆
Owner ZHEJIANG OULONG ELECTRIC
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