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    • 8. 发明公开
    • Circuit board testing apparatus and method
    • Vorrichtung und Verfahren zurPrüfungvon Leiterplatten
    • EP0919820A2
    • 1999-06-02
    • EP98120161.9
    • 1998-10-28
    • Nidec-Read Corporation
    • Yamashita, MunehiroKaida, Mitio
    • G01R31/28
    • G01R31/312G01R1/07385G01R31/2805G01R31/304
    • To conduct a continuity test in a short period of time using a moving head type testing apparatus a probe is made to contact one end of the test wiring of a circuit board (32), with a head (52) electrostatically coupled to the other end of the wiring, a pulse-like DC voltage is suplied from a signal source (46). Simultaneously with a switch section (SWp) turning on, the maximum voltage is applied to the test wiring. If a detection signal is below a specified value a computer (44) will determine this as "openning" or "shorting". Further, a tip (52a) of the head (52) may touch the circuit board (32) through an insulating sheet (33), so that the tip (52a) is kept away from each pad of a pad section (38) in the circuit board (32) at a fixed distance equivalent to the thickness of the insulating sheet (33). Thus a continuity test may be performed in a non-contact manner by moving the head (52) only along the X and Y directions without additional movement along the Z-direction.
    • 为了使用移动头式测试装置在短时间内进行连续性测试,使得探针与电路板(32)的测试布线的一端接触,其中静电耦合到另一端的头部(52) 的布线,从信号源(46)中可以看到脉冲状的直流电压。 同时开关部分(SWp)接通,最大电压被施加到测试接线。 如果检测信号低于指定值,则计算机(44)将确定为“开启”或“短路”。 此外,头部(52)的尖端(52a)可以通过绝缘片(33)接触电路板(32),使得尖端(52a)远离焊盘部分(38)的每个焊盘 电路板(32)的距离等于绝缘片(33)的厚度。 因此,可以以非接触的方式通过仅沿着X和Y方向移动头部(52)而不沿着Z方向的附加移动来执行连续性测试。
    • 9. 发明公开
    • Circuit board inspection apparatus and method
    • 电路板检查装置和方法
    • EP0862062A2
    • 1998-09-02
    • EP98103455.6
    • 1998-02-27
    • Nidec-Read Corporation
    • Takahashi, Tadashi
    • G01R31/312G01R31/28
    • H05K1/0268G01R31/312
    • The present invention provides an inexpensive and reliable circuit board inspection apparatus and method that is applicable to a densely wired circuit board. [Solution] A sensor module 50 is disposed on a pad section 38 on an inspected circuit board. The sensor module 50 is formed by integrating four sensor units 52, 54, 56 and 58 together. Each sensor unit is capacitively coupled to a plurality of corresponding pads so that a signal can be independently obtained from each sensor unit. By selecting a pad 36b of a pad section 36 and a sensor unit 54 and providing a predetermined signal between them to inspect the continuity, it can be determined whether a printed pattern 34x is open-circuited between a pad 38b and a pad 38x. This invention enables the continuity of complicated or irregular printed patterns to be inspected accurately and inexpensively.
    • 本发明提供一种适用于密集布线的电路板的廉价且可靠的电路板检查设备和方法。 [解决方案]传感器模块50设置在被检查电路板上的焊盘部分38上。 传感器模块50通过将四个传感器单元52,54,56和58集成在一起而形成。 每个传感器单元电容耦合到多个相应的焊盘,使得可以从每个传感器单元独立地获得信号。 通过选择焊盘部分36和传感器单元54的焊盘36b并在它们之间提供预定信号以检查连续性,可以确定印刷图案34x是否在焊盘38b和焊盘38x之间开路。 本发明能够精确且便宜地检查复杂或不规则印刷图案的连续性。