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FPC flexible plate copper foil oxidation detection method

A detection method and flexible board technology, applied in the direction of color/spectral characteristic measurement, image data processing, instruments, etc., can solve problems such as irreplaceable, short circuit, pad defects, etc., to achieve faster detection speed, strong operability, and simple effect

Inactive Publication Date: 2017-11-21
SOUTH CHINA UNIV OF TECH
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  • Application Information

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Problems solved by technology

On the other hand, as flexible circuit boards become more and more complex and the trend of small size becomes more and more obvious, it is easy to cause visual fatigue of inspectors, and it is difficult to guarantee the quality of inspection.
In the other two methods, the on-line inspection is mainly for the detection of electrical properties, and the functional inspection is for the detection of functional modules, neither of which can replace the above-mentioned manual visual inspection.
[0004] Defects of flexible circuit boards mainly include line defects (open circuit, short circuit, gap, burr, etc.), line deterioration (exposed copper, residual copper defects), pad defects, deformation defects
At present, there are many methods of flexible circuit defect detection based on pattern recognition and matching, but there are few studies on the copper oxidation status of flexible boards from the perspective of color. This method analyzes the collected images from the perspective of color, and can quickly distinguish images Whether it is oxidized, whether the flexible board meets the standard

Method used

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  • FPC flexible plate copper foil oxidation detection method
  • FPC flexible plate copper foil oxidation detection method
  • FPC flexible plate copper foil oxidation detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0028] Such as figure 1 As shown, a FPC flexible board copper foil oxidation detection method includes the following steps:

[0029] S1 acquires the color source image I of the FPC copper foil substrate to be detected, specifically:

[0030] In the three-dimensional system measurement, the PFC copper foil substrate is placed in a fixed position in the dark field, the intensity of the white ring-shaped cold light source is adjusted, and the source image to be detected of the color (RGB) FPC copper foil substrate is obtained by shooting with a camera. The copper foil absorbs light with a wavelength less than 580nm very well, and the reflectivity for light greater than 580nm is as high as 90%, so it appears red-orange. Copper oxide absorbs light with a wavelength of 400-780nm very well because it appears black. The solder resist covered on the line on the copper foil has an absorption rate of 70% for light with a wavelength of 620-760nm, because it is brown. The white ring lig...

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Abstract

The invention discloses a FPC flexible plate copper foil oxidation detection method, wherein a red component is extracted from the color image of a collected copper foil, the image under the red component is subjected to region dividing by using an improved quad-tree method, and the oxidized part is extracted. With the method of the present invention, the complexity of the traditional contour feature extraction method can be avoided, and the robustness of the method can be improved while the complexity of the computation can be reduced; and with the application of the method in the detection of the copper foil copper oxide, the copper can be well distinguished from the copper oxide, and the detection is rapid.

Description

technical field [0001] The invention relates to the field of precision electronic manufacturing detection, in particular to a method for detecting oxidation of copper foil on an FPC flexible board. Background technique [0002] FPC flexible circuit board, also known as soft board, consists of a flexible insulating substrate and conductive lines. The flexible circuit board has the same excellent electrical properties as the traditional PCB. At the same time, because of its material advantages, it is especially suitable for various applications with high density and miniaturization, and it shows better integration characteristics and stability. Flexible circuit boards are the only way to miniaturize consumer electronics. At present, flexible circuit boards have been widely used in aerospace, military, mobile terminals, mobile phones, digital cameras and other fields. [0003] In terms of defects in flexible circuit boards, online inspection, functional inspection, and manual...

Claims

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Application Information

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IPC IPC(8): G01N21/25G06T7/00G06T7/11
CPCG01N21/25G06T7/0004G06T7/11G06T2207/10024G06T2207/30141
Inventor 杜娟陈芳冯颖胡跃明
Owner SOUTH CHINA UNIV OF TECH
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