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    • 3. 发明授权
    • Method and apparatus for locating power plane shorts using polarized
light microscopy
    • 使用偏光显微镜定位电源平面短路的方法和装置
    • US6141093A
    • 2000-10-31
    • US139515
    • 1998-08-25
    • Bernell E. ArgyleArnold HalperinMichael E. ScamanEdward J. Yarmchuk
    • Bernell E. ArgyleArnold HalperinMichael E. ScamanEdward J. Yarmchuk
    • G01N21/21G01R31/311G01N21/00G01R27/14
    • G01N21/21G01R31/311
    • An apparatus and corresponding method for detecting, locating, or defining a short in a thin-film module. The apparatus includes a mechanical fixture supporting the module. A current source provides a current pulse to the module which produces a magnetic field and heating nearby the short which turns on and off as the pulsed current in the short turns on and off. Polarized light is directed onto the module, with an intermediate element disposed between the module and the source of the polarized light. The intermediate element may be a stress birefringent coating (e.g., a polyimide insulating layer) disposed on the module and onto which the polarized light is directed. The sample is rotated 0 to 45 degrees to maximize the birefringent effect. Alternatively, the intermediate element may be a magneto-optical Faraday rotator. A microscope is used to observe the module, facilitating identification of a short by the twisting of the polarization of the light as the short expands and shrinks in response to the heating or in response to the localized magnetic field. The preferred rotator is a composite having a garnet substrate, an iron garnet film disposed on the substrate, and a thin aluminum mirror layer disposed on the iron garnet film. The apparatus and method of the present invention have several applications.
    • 一种用于检测,定位或限定薄膜模块中的短路的装置和相应方法。 该装置包括支撑模块的机械夹具。 电流源向模块提供电流脉冲,其产生磁场并在短路附近加热,其短路中的脉冲电流接通和断开时导通和截止。 偏振光被引导到模块上,中间元件设置在模块和偏振光源之间。 中间元件可以是设置在模块上并且偏振光被引导到其上的应力双折射涂层(例如,聚酰亚胺绝缘层)。 样品旋转0至45度以最大化双折射效应。 或者,中间元件可以是磁光法拉第旋转器。 使用显微镜来观察模块,通过随着短路的扩展和响应于加热或响应于局部磁场而收缩,通过扭转光的偏振来促进短路的识别。 优选的旋转体是具有石榴石基材,设置在基材上的铁石榴石薄膜和设置在铁石榴石薄膜上的薄铝镜面层的复合体。 本发明的装置和方法有几个应用。
    • 5. 发明授权
    • Simplified contactless test of MCM thin film I/O nets using a plasma
    • 使用等离子体的MCM薄膜I / O网络的简化非接触测试
    • US5818239A
    • 1998-10-06
    • US811988
    • 1997-03-05
    • Michael E. Scaman
    • Michael E. Scaman
    • G01R31/02G01R31/304
    • G01R31/2812G01R31/024G01R31/304
    • A gas panel plasma plate is used to detect shorts and opens on a thin film surface of a multilayer ceramic module (MCM) through biasing a circuit of the module through bottom surface module (BSM) pins to produce a glow within the plasma plate. A grounded plane is placed above the module to be tested, and the gap between the module and the plane is filled with a gas. A plasma discharge is created by biasing the circuit. The current produced at the BSM pin by the plasma discharge is monitored. The monitored current of the circuit under test is compared to a current range of a known good module. In the alternative, the light flux produced by the plasma discharge is monitored, and the monitored light flux is compared to a light flux range of a known good module.
    • 气体板等离子体板用于通过使模块的电路通过底表面模块(BSM)引脚偏置来在等离子体板中产生辉光,来检测多层陶瓷模块(MCM)的薄膜表面上的短路和开路。 将接地平面放置在要测试的模块上方,并且模块和平面之间的间隙充满气体。 通过偏置电路产生等离子体放电。 监测通过等离子体放电在BSM引脚产生的电流。 将被测电路的监测电流与已知的良好模块的电流范围进行比较。 在替代方案中,监测由等离子体放电产生的光通量,并将所监视的光通量与已知的良好模块的光通量范围进行比较。
    • 10. 发明授权
    • Method for detecting power plane-to-power plane shorts and I/O net-to power plane shorts in modules and printed circuit boards
    • 用于检测模块和印刷电路板中的电源平面到电源平面短路和I / O网络到电源平面短路的方法
    • US06242923B1
    • 2001-06-05
    • US09116396
    • 1998-07-16
    • Michael E. ScamanEdward J. YarmchukArnold Halperin
    • Michael E. ScamanEdward J. YarmchukArnold Halperin
    • G01R3128
    • G01R31/281G01R1/07314G01R31/025
    • A method of locating in a non-destructive and non-invasive manner power plane-to-power plane shorts or I/O net-to-power plane shorts found in a printed circuit board or a multi-chip-module by way of a magnetic field generating probe is described. Thousands of nets can be simultaneously tested to detect not only the presence of a short but also to accurately pinpoint its position. For high resistance shorts, the probe is provided with a pot core housed inductor located at its tip, and is used at low frequencies to minimize the effect of the capacitive impedance between the power planes. For low resistance shorts, the probe is used at high frequencies, delivering equal but opposite current to each of two matched inductors at the tip of the probe to maximize mutual inductive coupling while minimizing electrostatic capacitive coupling with the board or module. In both cases, the highest current stress is on the probe rather than on the expensive and fragile package under inspection. This allows the test to be both more sensitive to high resistance shorts at low frequencies and is less destructive, thereby being less likely to blow filamentary shorts due to high current stresses through the board or module.
    • 以非破坏性和非侵入性的方式定位在印刷电路板或多芯片模块中通过以下方式发现的平面到电源平面短路或I / O网络至电源平面短路的方法 描述了磁场产生探针。 可以同时测试数千个网络,以检测不仅存在短路,还可以准确地确定其位置。 对于高电阻短路,探头设置有位于其尖端的锅芯容纳电感器,并且以低频率使用以最小化电力平面之间的电容性阻抗的影响。 对于低电阻短路,探头以高频率使用,为探头顶端的两个匹配电感器中的每一个提供相等但相反的电流,以最大化互感耦合,同时最小化与电路板或模块的静电电容耦合。 在这两种情况下,最高的电流应力在探头上,而不是昂贵和脆弱的被检查的包装。 这允许测试在低频下对高电阻短路更敏感,并且具有较小的破坏性,因此由于通过电路板或模块的高电流应力而不太可能发生短路短路。