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    • 62. 发明授权
    • Off-center solder ball attach and methods therefor
    • 偏心焊球附件及其方法
    • US06380060B1
    • 2002-04-30
    • US09652537
    • 2000-08-31
    • Wael Zohni
    • Wael Zohni
    • H01L2144
    • H05K3/3478H01L21/4853H05K2201/09509H05K2201/0959H05K2203/041H05K2203/043H05K2203/0557H05K2203/1178
    • A method of placing solder balls on a connection component includes providing a dielectric element having first conductive elements on a first surface, second conductive elements on a second surface, and conductive vias electrically interconnecting one or more of the first conductive elements and one or more of the second conductive elements. The first conductive elements may include conductive pads overlying the first surface of the dielectric element and the second conductive elements may include conductive leads or traces overlying the second surface of the dielectric element. Each via may have an opening at the first surface of the dielectric element. One or more of the vias may also have a closed end adjacent the second surface of the dielectric element. The via openings preferably extend through the first conductive elements. The method also includes positioning solder balls atop one or more of the first conductive elements, and then reflowing the solder balls for permanently attaching the solder balls to the conductive pads, wherein at least a portion of the via openings are exposed at the commencement of the reflowing step. Before reflowing the solder balls, the solder balls may be secured over the first conductive elements using a flux material. Maintaining at least a portion of each via opening exposed at the commencement of the reflowing step allows any air and/or flux solvent present in the via(s) to escape before the via opening(s) are completely closed by the reflowed solder material.
    • 将焊球放置在连接部件上的方法包括提供在第一表面上具有第一导电元件的介电元件,在第二表面上的第二导电元件和将一个或多个第一导电元件与一个或多个第一导电元件电连接的导电通孔, 第二导电元件。 第一导电元件可以包括覆盖在介电元件的第一表面上的导电焊盘,并且第二导电元件可以包括覆盖在电介质元件的第二表面上的导电引线或迹线。 每个通孔可以在介电元件的第一表面处具有开口。 一个或多个通孔也可以具有邻近电介质元件的第二表面的封闭端。 通孔开口优选地延伸穿过第一导电元件。 该方法还包括将焊球定位在一个或多个第一导电元件的顶部,然后回流焊球以将焊球永久地附接到导电焊盘,其中至少一部分通孔开口在开始时暴露 回流步骤 在回流焊球之前,可以使用焊剂材料将焊球固定在第一导电元件上。 保持在回流步骤开始时暴露的每个通孔的至少一部分允许存在于通孔中的任何空气和/或助焊剂溶剂在通孔开口被回流的焊料材料完全闭合之前逸出。