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    • 2. 发明授权
    • Reduction of chip carrier flexing during thermal cycling
    • 在热循环期间减少芯片载体弯曲
    • US06818972B2
    • 2004-11-16
    • US10262023
    • 2002-09-30
    • Lisa J. JimarezMiguel A. Jimarez
    • Lisa J. JimarezMiguel A. Jimarez
    • H01L23495
    • H01L23/49822B32B15/08H01L23/142H01L2224/16225H01L2924/01322H05K1/0271H05K3/4602H05K2201/0949H05K2201/09781H05K2201/10674H05K2201/10734Y10T428/125Y10T428/12528Y10T428/24917H01L2924/00
    • A method and structure for reducing chip carrier flexing during thermal cycling. A semiconductor chip is coupled to a stiff chip carrier (i.e., a chip carrier having an elastic modulus of at least about 3×105 psi), and there is no stiffener ring on a periphery of the chip carrier. Without the stiffener ring, the chip carrier is able to undergo natural flexing (in contrast with constrained flexing) in response to a temperature change that induces thermal strains due to a mismatch in coefficient of thermal expansion between the chip and the chip carrier. If the temperature at the chip carrier changes from room temperature to a temperature of about −40° C., a maximum thermally induced displacement of a surface of the chip carrier is at least about 25% less if the stiffener ring is absent than if the stiffener ring is present. Since a propensity for cracking of the stiff chip carrier increases as the thermally induced displacement increases, the present invention, which avoids use of the stiffener ring, improves a structural integrity of the chip carrier.
    • 用于减少热循环期间芯片载体弯曲的方法和结构。 半导体芯片耦合到刚性芯片载体(即具有至少约3×10 5 psi的弹性模量的芯片载体),并且在芯片载体的外围没有加强环。 没有加强环,芯片载体响应于由于芯片和芯片载体之间的热膨胀系数不匹配而引起热应变的温度变化,能够经受自然弯曲(与受限制的弯曲相反)。 如果芯片载体上的温度从室温变化到约-40℃的温度,如果加强环不存在,则芯片载体的表面的最大热诱导位移比如下 存在加强环。 由于热引起的位移增加,刚性芯片载体的开裂倾向增加,所以避免使用加强环的本发明改善了芯片载体的结构完整性。
    • 10. 发明授权
    • Metal backed printed circuit board assemblies
    • 金属背衬印刷电路板组件
    • US06734368B1
    • 2004-05-11
    • US08890582
    • 1997-07-09
    • Lisa J. JimarezDavid N. Light
    • Lisa J. JimarezDavid N. Light
    • H05K103
    • H05K3/0061H05K3/321Y10T29/49124
    • A method for conductively bonding a printed circuit board to a metal back plate is provided. The method includes the steps of providing a dielectric substrate that is metallized on its two faces; providing a metallic back plate; and bonding the metallic back plate to one of the metallized faces of the substrate using an electrically conductive adhesive that includes an adhesive polymer and at least one conductive metal having an electromagnetic force (EMF) that is equal to or less than one volt. The present invention also relates to a printed circuit board assembly which includes printed circuit board which includes a dielectric substrate having a first circuitized metallic layer disposed on one opposing face of the substrate and a second metallic layer disposed on the other opposing face of said substrate; a metal back plate; and an electrically conductive bonding layer disposed between the plate and the second metallic layer of the printed circuit board. The electrically conductive bonding layer contains an adhesive polymer and a conductive metal having an EMF that is less than one volt. The electrically conductive bonding layer is substantially free of silver.
    • 提供一种用于将印刷电路板导电地接合到金属背板的方法。 该方法包括以下步骤:提供在其两个表面上金属化的电介质基板; 提供金属背板; 以及使用包括粘合剂聚合物和至少一种具有等于或小于1伏的电磁力(EMF)的导电金属的导电粘合剂将所述金属背板接合到所述基板的金属化表面之一。 本发明还涉及一种印刷电路板组件,其包括印刷电路板,该印刷电路板包括具有设置在基板的一个相对面上的第一电路化金属层的电介质基板和设置在所述基板的另一相对面上的第二金属层; 金属背板 以及设置在印刷电路板的板和第二金属层之间的导电接合层。 导电接合层包含粘合剂聚合物和具有小于1伏特的EMF的导电金属。 导电接合层基本上不含银。