LEAD-FREE SOLDER PASTE
    44.
    发明公开
    LEAD-FREE SOLDER PASTE 有权
    无铅锡膏

    公开(公告)号:EP1889683A4

    公开(公告)日:2009-08-19

    申请号:EP06756513

    申请日:2006-05-24

    Inventor: UESHIMA MINORU

    Abstract: [PROBLEMS] Conventional Sn-Zn, lead-free solder pastes have disadvantages in that they are liable to form coarse Zn crystals of tens of micrometers in size and the formation of such coarse crystals can hardly be inhibited and that it is difficult to enhance the joint strength without changing the soldering temperature. Although an alloy improved in the strength by the addition of a slight amount of a group 1B element was developed, the alloy is disadvantageous in that it cannot reflow according to the same temperature profile as that of Sn-Pb paste because of its enhanced melting temperature. [MEANS FOR SOLVING PROBLEMS] A solder paste prepared by incorporating a powder of an Sn-Zn, lead-free solder paste with both an ethanol solution containing nanoparticles of 5 to 300nm in diameter containing at least one member selected from among Ag, Au and Cu and a flux forms, in soldering, an alloy consisting of Ag, Au and/or Cu and Zn and thereby forms fine clusters in the liquid phase, thus giving a fine solder texture after melting.

    Multilayer printed wiring board
    48.
    发明公开
    Multilayer printed wiring board 有权
    多层印刷线路板

    公开(公告)号:EP1744608A3

    公开(公告)日:2007-04-18

    申请号:EP06020624.0

    申请日:1999-05-21

    Abstract: In a multilayer printed wiring board comprising a multilayer core (1) board having conductor layers in its innerlayer, and interlaminar resin (3) insulating layers and conductor layers alternately laminated on a substrate to form buildup wiring layer connecting the conductor layers through via-hole (12), the multilayer core board has a resin insulating layer covering the innerlayer conductor circuits formed on the core material, and a via-hole is formed in the resin insulating layer so as to arrive at the innerlayer conductor circuit through the layer, and a through-hole (10) is formed in the resin insulating layer and a filler (8) is filled in the through-hole. A part of the via-hole (19) in the buildup wiring layer is located just above the through-hole (10) and connected to the through-hole. Even if the core board is multilayered, there can be provided a multilayer printed wiring board suitable for the high densification of through-holes which can sufficiently ensure the electrical connection to the innerlayer circuits in the core board through the through-holes.

    Abstract translation: 在多层印刷线路板中,该多层印刷线路板包括在其内层中具有导体层的多层芯(1)板以及交替层叠在基板上的层间树脂(3)绝缘层和导体层,以形成通过通孔连接导体层的累积布线层 (12)中,多层芯板具有树脂绝缘层,该树脂绝缘层覆盖形成在芯材上的内层导体电路,并且在树脂绝缘层中形成通孔以通过该层到达内层导体电路,并且 在树脂绝缘层中形成通孔(10),并且填充物(8)填充在通孔中。 增层配线层中的通孔(19)的一部分位于通孔(10)的正上方并连接至通孔。 即使芯板是多层的,也可以提供一种适合高通孔密度的多层印刷线路板,它能够充分确保通过通孔与核心板内的内层电路的电连接。

Patent Agency Ranking