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Method for detecting printed circuit board defect

A printed circuit board and defect technology, applied in the field of printed circuit board inspection, can solve the problems of missing wires, inability to detect and meet the design size, etc., and achieve the effect of reducing the missed detection rate and false detection rate and strong versatility

Inactive Publication Date: 2015-01-07
SHENZHEN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its advantage is that it does not need to refer to the PCB, so it does not need to be aligned. The disadvantage is that it cannot detect defects that meet the design size, such as missing a wire on the PCB, etc.

Method used

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  • Method for detecting printed circuit board defect
  • Method for detecting printed circuit board defect
  • Method for detecting printed circuit board defect

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Embodiment Construction

[0028] In order to solve the problems existing in the existing algorithms, a method for detecting printed circuit board defects is provided, the method is based on the Gerber file line width ratio algorithm, and the method comprises the following steps:

[0029] Step 1. Search all the circles in the Gerber file and find the four positioning circles of the PCB board for registration between the photographed image and the Gerber file;

[0030] Step 2, searching for all straight lines in the Gerber file;

[0031] Step 3, carry out the coordinate conversion between photographing picture and Gerber file;

[0032] Step 4, extracting the skeleton, according to 7 straight line parameters in the Gerber file, seek the distance between each pixel point on the skeleton and the nearest straight line in the Gerber file;

[0033] Step 5. Classify the defects according to the relationship between the distance value of the skeleton pixel point and the line width of the straight line.

[0034...

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Abstract

The invention provides a method for detecting a printed circuit board defect. The method comprises the steps of: parsing Gerber file codes, searching for all circles in the file, saving corresponding parameters, parsing the Gerber file codes, searching all straight lines in the file, saving corresponding parameters, comparing difference change between distance values of framework pixel points and straight lines line width values, carrying out classification searching on defects. By using a technical scheme provided by the invention, an omission ratio and a fall-out ratio can be reduced; a defect of the detection printed circuit board and a type of the defect can be automatically discovered; and the method has high generality.

Description

technical field [0001] The invention relates to a method for detecting defects of a printed circuit board, more specifically, to a method for detecting typical defects of a printed circuit board based on a Gerber file line width comparison algorithm. The invention belongs to the technical field of printed circuit board detection. Background technique [0002] The printed circuit board is the main component of various electronic products, known as the "mother of electronic products", it is required for any electronic equipment and products, and its performance greatly affects the quality of electronic products . Almost every kind of electronic equipment is inseparable from PCB, ranging from electronic watches and calculators to aerospace, military weapon systems, etc., all of which contain PCB boards of various sizes. In recent years, with the continuous improvement of production technology, PCB is developing rapidly in the direction of ultra-thin, small components, high de...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/88G01R31/02
Inventor 冯平程涛彭小波徐刚梁婧
Owner SHENZHEN UNIV