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    • 1. 发明授权
    • Thin film solder paste deposition method and tools
    • 薄膜焊膏沉积方法和工具
    • US6145735A
    • 2000-11-14
    • US150673
    • 1998-09-10
    • Michael T. MalleryJames K. Lake
    • Michael T. MalleryJames K. Lake
    • B23K1/008B23K35/02B23K35/14H05K3/34B23K35/12
    • B23K1/008B23K35/0222H05K3/3484B23K2201/40B23K35/025H05K2201/10636H05K2203/0338H05K3/3442Y02P70/611
    • Solder is deposited on chip elements or other potentially irregular surfaces by applying solder paste to a thin porous sheet such as cotton twill cloth so that the solder paste fills open areas therein. The solder volume is thus regulated by the texture and structure of the porous sheet. The porous sheet is then placed in compression against the surface to which solder is to be applied and the solder in the solder paste reflowed in an oven, preferably including a nitrogen atmosphere. At the same time, excess flux is absorbed by the porous sheet to facilitate subsequent cleaning while the reflow of solder is accurately and repeatably controlled. The process and resulting structure are particularly appropriate to the manufacture of discrete electronic devices which include an array of chip components such as capacitor chips sandwiched between plate structures. The process and structure also provides highly repeatable, high quality solder connections between curved surfaces.
    • 通过将焊膏涂布到诸如棉斜纹布之类的薄多孔板上,将焊料沉积在芯片元件或其它可能不规则的表面上,使得焊膏填充其中的开放区域。 因此,焊料体积由多孔片材的质地和结构调节。 然后将多孔片材压在待施加焊料的表面上,并且焊膏中的焊料在烘箱中回流,优选地包括氮气氛。 同时,多余的片材吸收了过量的助焊剂,从而便于后续的清洗,而焊料的回流精确和可重复地被控制。 该方法和结果结构特别适用于分立电子器件的制造,其包括诸如夹在板结构之间的电容器芯片的芯片组件阵列。 该工艺和结构还提供了弯曲表面之间高度可重复,高质量的焊接连接。
    • 2. 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。
    • 8. 发明授权
    • Reflow soldering method and a reflow soldering furnace
    • 回流焊接方法和回流焊炉
    • US6135344A
    • 2000-10-24
    • US123869
    • 1998-07-28
    • Seiki SakuyamaTaro Matsuoka
    • Seiki SakuyamaTaro Matsuoka
    • B23K1/008B23K1/012F27B9/06F27B9/10F27B9/24F27D7/04H05K3/34B23K31/02B23K1/00B23K5/00D06E75/24F27B14/00
    • F27B9/243B23K1/012F27B9/10B23K2201/40F27B9/066F27D7/04H05K3/3494
    • A reflow soldering furnace in which a printed board and a plurality of electronic parts mounted thereon are subjected to reflow soldering. The furnace comprises a reflow soldering furnace body including a plurality of heating zones defined by furnace walls, a hot-gas applier, and a radiant-heat applier. The hot-gas applier includes a heat source and a fan for blowing a hot gas of a temperature lower than a target temperature for each zone against a printed board. The radiant-heat applier includes a heater for applying radiant heat of a temperature higher than the target temperature to the printed board. The printed board and electronic parts thereon are heated to the target temperature, the melting point of solder, by means of the radiant heat from the heater. Among these electronic parts, small-sized ones with a relatively small heat capacity are restrained from overheating by the low-temperature hot gas from the hot-gas applier.
    • 将印刷基板和安装在其上的多个电子部件进行回流焊接的回流焊炉。 该炉包括回流焊炉体,其包括由炉壁限定的多个加热区,热气施加器和辐射加热器。 热气体施加器包括热源和用于将每个区域的温度低于目标温度的热气体相对于印刷板吹送的风扇。 辐射加热器包括用于将高于目标温度的温度的辐射热施加到印刷板的加热器。 借助于来自加热器的辐射热将印刷电路板和其上的电子部件加热到目标温度,焊料的熔点。 在这些电子部件中,通过来自热气体加热器的低温热气,能够抑制热容量相对较小的小型化部件的过热。