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    • 8. 发明授权
    • Circuit package having low modulus, conformal mounting pads
    • 具有低模数,适形安装垫的电路封装
    • US06399896B1
    • 2002-06-04
    • US09525379
    • 2000-03-15
    • Frank J. Downes, Jr.Donald S. FarquharRobert M. JappWilliam J. Rudik
    • Frank J. Downes, Jr.Donald S. FarquharRobert M. JappWilliam J. Rudik
    • H05K116
    • H05K3/326H05K1/0271H05K1/111H05K1/114H05K2201/0133H05K2201/0187H05K2201/10734H05K2203/0307
    • Reliability of circuit packaging while accommodating larger chips and increased temperature excursions is achieved by use of compliant pads only at the locations of connections between packaging levels, preferably between a laminated chip carrier and a printed circuit board. The invention allows the coefficient of thermal expansion of the chip carrier to be economically well-matched to the CTE of the chip and accommodation of significant differences in CTEs of package materials to be accommodated at a single packaging level. The compliant pads are preferably of low aspect ratio which are not significantly deflected by accelerations and can be formed on a surface or recessed into it. Connections can be made through surface connections and/or plated through holes. Connection enhancements such as solder wettable surfaces or dendritic textures are provided in a conductive metal or alloy layer over a compliant rubber or elastomer layer which may be conductive or non-conductive.
    • 通过仅在封装层之间的连接位置(优选在层压芯片载体和印刷电路板之间)使用柔性焊盘来实现电路封装的可靠性,同时容纳更大的芯片和增加的温度漂移。 本发明允许芯片载体的热膨胀系数与芯片的CTE经济地良好匹配,并且可以容纳在单个封装层面上容纳的封装材料的CTE的显着差异。 柔性衬垫优选地具有低纵横比,其不被加速度显着偏转,并且可以形成在表面上或凹入其中。 可以通过表面连接和/或电镀通孔进行连接。 在导电金属或合金层中的柔性橡胶或弹性体层上提供诸如焊料可润湿表面或树枝状织构的连接增强,其可以是导电的或不导电的。
    • 9. 发明授权
    • Chip C4 assembly improvement using magnetic force and adhesive
    • 芯片C4组装改进使用磁力和粘合剂
    • US6142361A
    • 2000-11-07
    • US458483
    • 1999-12-09
    • Francis J. Downes, Jr.Robert M. JappMark V. Pierson
    • Francis J. Downes, Jr.Robert M. JappMark V. Pierson
    • H01L21/60H05K3/30H05K3/34B23K1/20B23K31/02
    • H01L24/81B23K2201/40H01L2224/81801H01L2924/01006H01L2924/01033H01L2924/0105H01L2924/01082H01L2924/01322H01L2924/014H01L2924/14H05K3/303H05K3/3436Y10T29/4913Y10T29/53196
    • A method, and associated structure, for adhesively coupling a chip to an organic chip carrier. The chip is attached to a top surface of the organic chip carrier by interfacing a solder bump between a C4 solder structure on the chip and a pad on a top surface of the chip carrier. The melting temperature of the solder bump is less than the melting temperature of the C4 solder structure. A block of ferrous material is placed on a top surface of the chip. A temporary or permanent stiffener of ferrous material is placed on the top surface of the chip carrier. A permanent magnet is coupled to a bottom surface of the chip carrier. Alternatively, an electromagnetic could be utilized instead of the electromagnet. Due to the permanent magnet or the electromagnet, a magnetic force on the stiffener is directed toward the magnet and substantially flattens the first surface of the chip carrier. Similarly, a magnetic force on the block is directed toward the magnet such that the electronic component and the chip carrier are held in alignment. The solder bump is reflowed at a temperature between the melting temperature of the solder bump and the melting temperature of the C4 solder structure. The reflowing reconfigures the solder bump. The magnetic force on the block frictionally clamps the reflowed solder between the C4 solder structure and the pad. The chip and carrier are cooled, resulting in the C4 solder structure being adhesively and conductively coupled to the pad.
    • 一种用于将芯片粘合地耦合到有机芯片载体的方法和相关联的结构。 芯片通过在芯片上的C4焊料结构和芯片载体的顶表面上的焊盘之间接合焊料凸块来附接到有机芯片载体的顶表面。 焊料凸点的熔化温度小于C4焊料结构的熔化温度。 将一块黑色金属材料放置在芯片的上表面上。 铁芯材料的临时或永久性加强件被放置在芯片载体的顶表面上。 永磁体耦合到芯片载体的底表面。 或者,可以使用电磁来代替电磁体。 由于永磁体或电磁体,加强件上的磁力被引向磁体并且基本平坦化芯片载体的第一表面。 类似地,块上的磁力指向磁体,使得电子部件和芯片载体保持对准。 在焊料凸块的熔化温度和C4焊料结构的熔化温度之间的温度下回流焊料凸点。 回流重新配置焊料凸块。 块上的磁力摩擦地夹住C4焊料结构和焊盘之间的回流焊料。 芯片和载体被冷却,导致C4焊料结构被粘性地导电耦合到焊盘。