公开(公告)号：US5621327A

公开(公告)日：1997-04-15

申请号：US409743

申请日：1995-03-24

申请人： Shinwu Chiang ,  Huntington W. Curtis ,  Arthur E. Falls ,  Arnold Halperin ,  John P. Karidis ,  John D. Mackay ,  Danny C.-Y. Wong ,  Ka-Chiu Woo ,  Li-Cheng Zai

发明人： Shinwu Chiang ,  Huntington W. Curtis ,  Arthur E. Falls ,  Arnold Halperin ,  John P. Karidis ,  John D. Mackay ,  Danny C.-Y. Wong ,  Ka-Chiu Woo ,  Li-Cheng Zai

IPC分类号： G01R31/02 ,  G01R31/28 ,  G01R27/26

CPC分类号： G01R31/2805

摘要： Apparatus and method are disclosed for performing testing and fault isolation of high density passive boards and substrates. Using a small number of moving probes, simultaneous network resistance and network capacitance measurements may be performed. Thus, test time is minimized by eliminating the need for electrical switching and/or excessive probe movement during the test of a normal circuit board network. Simultaneous network capacitance and network leakage measurement are also achieved using phase-sensitive detection. Dual-frequency measurement techniques allow the measurement of both the capacitance value and resistance value of a leakage path between a network being measured and an unknown network. Any leakage resistance between a network under test and ground or power planes within the circuit board may also be determined from the measurements. Simultaneous independent net-to-plane capacitance characterization is also achieved using signals of mutually independent frequencies accompanied by minimal signal processing. Thus, improved defect detection capabilities are obtained.

摘要翻译： 公开了用于执行高密度无源板和衬底的测试和故障隔离的装置和方法。 使用少量移动探头，可以执行同时的网络电阻和网络电容测量。 因此，在普通电路板网络的测试期间，通过消除电气切换和/或过度的探头移动的需要来最小化测试时间。 使用相敏检测也可以实现网络电容和网络泄漏测量。 双频测量技术允许测量被测网络与未知网络之间的泄漏路径的电容值和电阻值。 被测网络和电路板内的接地或电源层之间的任何漏电阻也可以从测量中确定。 使用相互独立的频率的信号伴随着最小的信号处理也实现了同时独立的网络到平面电容表征。 因此，获得了改进的缺陷检测能力。

公开(公告)号：US5471659A

公开(公告)日：1995-11-28

申请号：US96223

申请日：1993-07-26

申请人： Danny C. Y. Wong

发明人： Danny C. Y. Wong

IPC分类号： H04B1/08 ,  H04B1/38

CPC分类号： H04B1/086 ,  H04B1/3805

摘要： A combination radio (10) is provided for enabling the user to listen to two independent radio stations at one time. Alternatively, the combination radio (10) can be tuned into the same radio frequency to allow the user to combine the sound output from each individual radio. Moreover, additional radios can be added to the combination radio to increase the sound output of the system.

摘要翻译： 提供组合无线电（10），用于使用户能够一次收听两个独立的无线电台。 或者，可以将组合无线电（10）调谐成相同的射频，以允许用户组合来自每个单独无线电的输出的声音。 此外，可以向组合无线电添加额外的无线电，以增加系统的声音输出。

公开(公告)号：US5543918A

公开(公告)日：1996-08-06

申请号：US369828

申请日：1995-01-06

申请人： David W. Abraham ,  Danny C. Y. Wong

发明人： David W. Abraham ,  Danny C. Y. Wong

IPC分类号： G01B11/02 ,  G01B11/24

CPC分类号： G01B11/026

摘要： Apparatus and method for measuring a change in the height of a surface or the distance between two surfaces. The invention involves converging a light beam having a beam axis and a focus onto the said surface; scanning the focus of the light beam across the surface along the beam axis using a scanning means; measuring intensity of light reflected from the surface during the scanning; determining a maximum of the light intensity; assigning to the maximum of the light intensity a position of the scanning means; repeating these steps to monitor a change in the position of the scanning means assigned to the maximum of the light intensity; and correlating such change in the position of the scanning means to a change in the height of the surface.

摘要翻译： 用于测量表面高度变化或两个表面之间距离的装置和方法。 本发明涉及将具有光束轴和焦点的光束会聚在所述表面上; 使用扫描装置沿光束轴扫描光束的焦点横过该表面; 测量在扫描期间从表面反射的光的强度; 确定光强度的最大值; 将扫描装置的位置的光强度的最大值分配; 重复这些步骤来监视分配给最大光强度的扫描装置的位置的变化; 并且将扫描装置的位置的这种变化与表面的高度的变化相关联。