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    • 98. 发明授权
    • Method of forming a solder ball
    • 形成焊球的方法
    • US06386436B2
    • 2002-05-14
    • US09785731
    • 2001-02-16
    • David R. Hembree
    • David R. Hembree
    • B23K3512
    • B23K3/0623B23K1/0008B23K35/0244B23K2101/42H01L21/4853H05K3/3457H05K2203/0113
    • The present invention is drawn to a method of making solder bump interconnections or BGAs ranging from chip-level connections to either single chip or multichip modules, flip-chip packages and printed circuit board connections. According to the method of the present invention, a die wafer or a substrate with a conductive contact location is positioned in close proximity and aligned with a mold wafer having a pocket corresponding to the contact location of the die wafer. A source of a molten solder is also provided which interconnects with the mold wafer. The molten solder from the source is introduced into the pocket of the mold wafer such that the molten solder wets the contact location aligned with the pocket. Before the molten solder inside the pocket is allowed to solidify, the die wafer and the mold wafer are separated from each other. Some of the molten solder is attracted to the contact location of the die wafer as it separates from the remaining molten solder in the pocket so as to assume the shape of a partial sphere. The method of the present invention is especially useful for batch processing in the formation of a large number of solder balls.
    • 本发明涉及一种制造从芯片级连接到单芯片或多芯片模块,倒装芯片封装和印刷电路板连接的焊料凸块互连或BGA的方法。 根据本发明的方法,晶片晶片或具有导电接触位置的基板位于紧密接近并且与具有对应于晶片晶片的接触位置的凹穴的模具晶片对准。 还提供了与模具晶片互连的熔融焊料的源。 来自源的熔融焊料被引入模具晶片的凹槽中,使得熔融焊料润湿与凹穴对准的接触位置。 在允许袋内的熔融焊料固化之前,将晶片和模具晶片彼此分离。 一些熔融焊料被吸引到芯片晶片的接触位置,因为其与袋中剩余的熔融焊料分离,以呈现部分球形的形状。 本发明的方法对于形成大量焊球的批处理特别有用。