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    • 10. 发明授权
    • Method of forming solder mask
    • 形成焊接掩模的方法
    • US5368884A
    • 1994-11-29
    • US118231
    • 1993-09-09
    • Yoshikazu YamagamiAkio KashiharaMamoru SeioHisaki Tanabe
    • Yoshikazu YamagamiAkio KashiharaMamoru SeioHisaki Tanabe
    • G03F7/16H05K3/00H05K3/28B05D1/00
    • G03F7/164H05K3/28H05K2203/1105H05K2203/1355H05K3/0079
    • The present invention has as its object providing a solder mask which permits high density mounting, is suitable for protecting conductor circuits, particularly has mask thickness on the circuit parts and each edge part of the circuits which make almost no difference from those on other parts, and is excellent in electrical insulation, heat resistance and solvent resistance.This invention provides a method of forming a solder mask for printed circuit boards, using any powder paint which is curable by both irradiation of ultraviolet ray and heat, comprising:(1) a step of coating the powder paint on a printed circuit board, while holding it at a temperature higher than a softening point of the powder paint,(2) a step of irradiating ultraviolet rays thereon through a pattern mask,(3) a step of making development with a medium which dissolves the region not irradiated by ultraviolet rays and,(4) a step of completely curing the coating part developed on the printed circuit board at a temperature higher than the curing temperature of the powder paint.
    • 本发明的目的是提供一种允许高密度安装的焊接掩模,适用于保护导体电路,特别是在电路部件和电路的每个边缘部分具有掩模厚度,与其它部件几乎没有区别, 电绝缘性,耐热性和耐溶剂性优异。 本发明提供一种形成印刷电路板用焊料掩模的方法,使用可通过紫外线照射和热照射两者固化的任何粉末涂料,其包括:(1)在粉末涂料上涂布印刷电路板的步骤,同时 将其保持在高于粉末涂料的软化点的温度下,(2)通过图案掩模在其上照射紫外线的步骤,(3)利用溶解未被紫外线照射的区域的介质进行显影的步骤 和(4)在高于粉末涂料的固化温度的温度下完全固化在印刷电路板上显影的涂层部分的步骤。