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    • 4. 发明授权
    • Method of producing flex circuit with selectively plated gold
    • 用选择性镀金制造柔性电路的方法
    • US06383401B1
    • 2002-05-07
    • US09607978
    • 2000-06-30
    • Daniel P. LabzentisFrancesco F. MarconiAllan R. KnollDavid J. Bajkowski
    • Daniel P. LabzentisFrancesco F. MarconiAllan R. KnollDavid J. Bajkowski
    • H01B1300
    • H05K3/243H05K3/108H05K2203/0574
    • Disclosed is a method of producing a flexible circuit board having gold selectively plated on only desired elements of the conductive circuits. These desired elements typically are attachment sites, such as wire bond pads or ball grid array pads, for semiconductor chips. This method eliminates the requirement to buss all circuits to a common plating contact by using a background seed metal for plating continuity. This method also provides a means to alleviate the requirement for precise registration or alignment when multiple photoresist layers are employed in order to selectively plate only a portion of the metallic elements present on the flexible circuit board. The defect of resist lifting followed by nickel/gold underplating is eliminated by conditioning the intermediate photoresist to survive the nickel/gold plating bath.
    • 公开了一种制造柔性电路板的方法,所述柔性电路板具有仅选择性地镀在导电电路的所需元件上的金。 这些期望的元件通常是用于半导体芯片的附接位置,例如引线接合焊盘或球栅阵列焊盘。 该方法消除了通过使用背景种子金属将电路连接到公共电镀接触的所有电路的要求。 该方法还提供了一种减轻对多个光致抗蚀剂层的精确对准或对准的要求的手段,以便仅选择性地仅对存在于柔性电路板上的金属元件的一部分进行平板化。 通过调节中间光致抗蚀剂以抵抗镍/金镀层的缺陷,消除镍/金镀层的缺陷。