Method for filling holes in printed wiring boards
    4.
    发明授权
    Method for filling holes in printed wiring boards 失效
    填充印刷电路板孔的方法

    公开(公告)号:US6015520A

    公开(公告)日:2000-01-18

    申请号:US857188

    申请日:1997-05-15

    摘要: A method for filling a hole in a printed wiring board (PWB) and the resultant PWB. During an intermediate stage in fabrication, a PWB comprises a lamination of dielectric sheets with metalizations on various layers and a plated through hole (PTH). A photoimageable material is formed on a surface of the laminate and covers the PTH. The photoimageable material in a region covering the PTH is partially cured by exposure to light. The remainder of the photoimageable material is developed away. Then, the partially cured photoimageable material in the region of the PTH is pressed into the PTH to form a plug. By application of heat during or after the forcing step, the plug is further cured to a hard condition. For some applications, the plug is mechanically abraded to be flush with one or both surfaces of the laminate. The plug can serve as a solder mask or permit another layer of low viscosity photoimageable material to be formed over the laminate such that the hole, now plugged, will not interfere with the formation of such additional layer.

    摘要翻译: 一种用于在印刷电路板(PWB)中填充孔的方法和所得的PWB。 在制造的中间阶段期间,PWB包括在各种层上具有金属化的电介质片层压和电镀通孔(PTH)。 在该层叠体的表面上形成可光成象的材料并覆盖PTH。 覆盖PTH的区域中的可光成像材料通过曝光而部分固化。 剩余的可光成像材料被开发出来。 然后,将PTH区域中的部分固化的可光成像材料压入PTH中以形成塞子。 通过在强迫步骤期间或之后施加热量,塞子进一步固化到硬的状态。 对于一些应用,插塞被机械磨损以与层压板的一个或两个表面齐平。 塞子可以用作焊接掩模或允许在层压板上形成另一层低粘度可光成像材料层,使得现在堵塞的孔不会干扰这种附加层的形成。