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COF soft board defect detection method

A technology for defect detection and soft boards, which is applied in the direction of optical testing flaws/defects, measuring devices, instruments, etc., can solve problems such as heavy workload, inaccurate detection, lagging COF soft boards, etc., and achieve high precision and strong robustness Effect

Inactive Publication Date: 2020-10-30
FOSHAN NANHAI GUANGDONG TECH UNIV CNC EQUIP COOP INNOVATION INST +1
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Problems solved by technology

[0003] As far as the traditional quality inspection methods of printed circuit boards are concerned, they mainly include manual visual inspection, hole number inspection machines, and hole position inspection machines. Due to the shortcomings of inaccurate inspection, heavy workload, visual fatigue, and low inspection efficiency, Gradually unable to keep up with the production speed of COF flexible boards, and even seriously lagging behind the production of COF flexible boards

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  • COF soft board defect detection method
  • COF soft board defect detection method
  • COF soft board defect detection method

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Embodiment Construction

[0026] Below, in conjunction with accompanying drawing and specific embodiment, the present invention is described further:

[0027] as attached figure 1 As shown, a method for defect detection of a COF flexible board provided by the present invention includes the following steps:

[0028] S01: Acquire the image of the COF flexible board, and perform Fourier transform on the image of the COF flexible board, and obtain the transformed frequency domain map and power spectrum; wherein, the COF flexible board includes copper-containing areas and copper-free blank areas, including The copper area is used to connect the IC chip or lead out the signal in the COF flexible board. In this step, the COF soft board image can be obtained online through the industrial line scan camera. When the industrial line scan camera captures the COF soft board image, the backlight of the light source is irradiated vertically on the COF soft board, so that the copper-containing area and the blank area...

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Abstract

The invention discloses a COF soft board defect detection method. The method comprises the following steps of S01, obtaining a COF soft board image, and performing Fourier transform on the COF soft board image to obtain a frequency domain graph and a power spectrum after the transform; S02, setting a low-energy threshold value and a high-energy threshold value for the power spectrum, and mapping an area, between the low-energy threshold value and the high-energy threshold value, in the power spectrum into a frequency domain graph to generate a band elimination notch filter; S03, filtering thefrequency domain graph by adopting the band elimination notch filter to obtain a filtered frequency domain graph; S04, converting the filtered frequency domain graph back to a spatial domain, and finding out a potential defect area through a local dynamic threshold method; and S05, carrying out area screening on the potential defect area to obtain an accurate defect area, and outputting the accurate defect area. According to the method, the small defects of a COF soft board are detected by adopting a method of combining a frequency domain with a space domain, the precision is high, and the robustness is high.

Description

technical field [0001] The invention relates to the technical field of COF flexible board detection, in particular to a method for detecting defects of a COF flexible board. Background technique [0002] COF (Chip On FlexorChip On Film, chip on film), which belongs to the technology of fixing the driver IC on the flexible circuit board, is to use the soft additional circuit board as the package chip carrier to bond the chip and the flexible substrate circuit Technology. Due to the large-scale production of COF flexible boards, various quality problems will inevitably occur during the production process. With the miniaturization and precision of electronic products, the design and production of COF flexible boards are also becoming more and more miniaturized and precise, and they are developing in the direction of small aperture, narrow line spacing and multi-layer count, which makes the quality inspection technology of COF flexible boards become essential. [0003] As far...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/88
CPCG01N21/8851G01N2021/8887
Inventor 张鹏中杨海东廖旋
Owner FOSHAN NANHAI GUANGDONG TECH UNIV CNC EQUIP COOP INNOVATION INST