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    • 6. 发明授权
    • Wire bond encapsulant application control
    • 电线键合密封剂应用控制
    • US07659141B2
    • 2010-02-09
    • US11860541
    • 2007-09-25
    • Laval Chung-Long-ShanKiangkai TankongchumruskulKia Silverbrook
    • Laval Chung-Long-ShanKiangkai TankongchumruskulKia Silverbrook
    • H01L21/00
    • H01L23/3157H01L21/56H01L24/48H01L24/78H01L24/85H01L2224/45015H01L2224/48091H01L2224/48227H01L2224/48472H01L2224/78H01L2224/8592H01L2224/85947H01L2924/00014H01L2924/01014H01L2924/01027H01L2924/01033H01L2924/09701H01L2924/10253H01L2924/14H01L2924/1461H01L2924/20753H01L2924/20752H01L2924/00H01L2224/45099H01L2924/20754H01L2224/05599
    • A method of applying encapsulant to a die mounted to a support structure by providing a die mounted to the support structure, the die having a back surface in contact with the support structure and an active surface opposing the back surface, the active surface having electrical contact pads, positioning a barrier proximate the electrical contact pads and spaced from the active surface to define a gap and, depositing a bead of encapsulant onto the electrical contact pads such that one side of the bead contacts the barrier and a portion of the bead extends into the gap and onto the active surface. Placing a barrier over the active surface so that it defines a narrow gap allows the geometry of the encapsulant front (the line of contact between the encapsulant and the active surface) can be more closely controlled. Any variation in the flowrate of encapsulant from the needle tends to cause bulges or valleys in the height of the bead and or the PCB side of the bead. The fluidic resistance generated by the gap between the barrier and the active surface means that the amount of encapsulant that flows into the gap and onto the active surface is almost constant. The reduced flow variations make the encapsulant front closely correspond to the shape of the barrier. Greater control of the encapsulant front allows the functional elements of the active surface of the die to be closer to the contact pads.
    • 一种通过提供安装到支撑结构的模具将密封剂施加到安装到支撑结构上的模具的方法,模具具有与支撑结构接触的后表面和与背面相对的活动表面,活性表面具有电接触 焊盘,邻近电接触焊盘定位屏障并且与有源表面间隔开以限定间隙,并且将密封剂珠填充到电接触焊盘上,使得焊道的一侧接触屏障并且一部分焊珠延伸成 间隙和活动表面。 在活性表面上设置阻挡层,使得其限定窄的间隙允许密封剂前部的几何形状(密封剂和活性表面之间的接触线)可以被更加严密地控制。 密封剂从针头流出的任何变化趋向于在珠子的高度和珠子的PCB侧产生凸起或凹陷。 由阻挡层和活性表面之间的间隙产生的流体阻力意味着流入间隙和活性表面上的密封剂的量几乎恒定。 减少的流动变化使得密封剂前端紧密对应于屏障的形状。 密封剂前沿的更好的控制允许模具的有效表面的功能元件更接近接触垫。