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Laser cleaning of printed circuit boards

机译：激光清洗印刷电路板

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Laser cleaning of printed circuit boards (PCB) has been studied in this paper. It is demonstrated that laser cleaning is a powerful tool to remove resin contaminants from printed circuit boards. A Nd:YAG laser is used as a light source for laser cleaning. The beam profile of the YAG laser is reshaped and homogenized into a square beam with uniform energy distribution in the focal plane of the focusing lens by using an optical system. The printed circuit board surfaces before and after laser cleaning were inspected by an optical microscope, analysed by X-ray photoelectron spectroscopy and monitored by an acoustic wave detection method. The cleaning threshold is about 75 mJ/cm~2 and no damage is observed below 400 mJ/cm~2.
机译：本文研究了激光清洗印刷电路板（PCB）。事实证明，激光清洁是去除印刷电路板上树脂污染物的有力工具。 Nd：YAG激光器用作激光清洁的光源。通过使用光学系统，将YAG激光的光束轮廓进行整形，并在聚焦透镜的焦平面内均匀化为具有均匀能量分布的方光束。通过光学显微镜检查激光​​清洗前后的印刷电路板表面，通过X射线光电子能谱分析并通过声波检测法进行监视。清洁阈值约为75 mJ / cm〜2，在400 mJ / cm〜2以下没有发现损坏。

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