Abstract:
A testing system module for testing printed circuit board (PCB) includes a first robot having a pogo pin for moving to a first testing point of a first surface of the PCB and the pogo pin contacting the first testing point; a second robot having another pogo pin for moving to a second point of a second surface of the PCB and the pogo pin contacting the second testing point; and a source meter for forcing the signals to the pogo pins and sensing the signals from the pogo pins.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    (1) Field of the invention 
         [0002]    The present invention relates to a testing system module for printed circuit board. More particularly, the present invention relates to a testing system module for testing short circuit, open circuit and extreme low leakage current of printed circuit board. 
         [0003]    (2) Prior art 
         [0004]    In the manufacturing process of printed circuit board, some electrical defects such as short circuit, open circuit, and leakage current would be caused by outside factors. Moreover, evolutions of printed circuit board are high-density, fine pitch, and multi-layer. Therefore, it would cause more cost wasting if the bad board could not be found in time. Besides the improvement of the control of manufacturing process of printed circuit board, improvement of testing technology of printed circuit board is also a good way for manufacturer to reduce scraped rate and raise quality of produce. 
         [0005]    In tradition, the way of testing electricity of printed circuit board comprises that using three equipments to perform, which are dedicated test equipment, universal grid test equipment, and flying probe test equipment. 
         [0006]    Regarding to dedicated test equipment, which comprises a fixture, such as a dial of testing electricity of printed circuit board. The fixture is only matched one type of printed circuit board. The other types of printed circuit board aren&#39;t tested by this dedicated test equipment. Moreover, the fixture would not be reused. Therefore, it wastes cost very much. Otherwise, leakage current of printed circuit board tested by dedicated test equipment lacks stability. The testing data lacks stability that the testing data are not accuracy and the extreme low leakage current, such as nano-ampere level or lower leakage current, could not be tested by the dedicated test equipment. 
         [0007]    Universal grid test equipment has a big-size dial being fixture, and the big-size dial has many grids which has testing point. Thus, varied kinds of printed circuit board could be tested by the universal grid test equipment, and the universal grid test equipment does not need to change the fixture. However, as well as dedicated test equipment, leakage current of printed circuit board tested by dedicated test equipment also lacks stability. Moreover, the testing density of printed circuit board tested by universal grid test equipment has limitation. When the printed circuit board is a high-density board, the high-density board isn&#39;t tested by the universal grid test equipment. 
         [0008]    Flying probe test equipment which merely has two probes to move on x, y, and z axes and to test any testing point of printed circuit board, therefore, it doesn&#39;t need more expensive fixture for testing. However, using flying probe test equipment to test printed circuit board still couldn&#39;t test the current range of IC testing level. Therefore, it would affect the efficiency and quality of further testing fabrication when the printed circuit board that current range of IC testing level of printed circuit board aren&#39;t tested is used to test IC. In order to solve the problem that extreme low leakage current of printed circuit board aren&#39;t tested by flying probe test equipment, in general, the testing process of this portion would be performed by extra-manpower. However, it not only wastes manpower but also adds cost of product. 
         [0009]    Therefore, it&#39;s needed to find a testing system module which could combine the function of auto-continuingly testing and the function of accurately testing leakage current of printed circuit board. Moreover, extreme low leakage current could be tested automatically, the cost of manpower and time could be saved, and the stability of testing data could be promoted. 
       SUMMARY OF THE INVENTION 
       [0010]    An object of the present invention is to provide a testing system module for testing short circuit, open circuit and extreme low leakage current of printed circuit board. 
         [0011]    Another object of the present invention is to provide a testing system module, which is an automatic system module for testing extreme low leakage current of printed circuit board. 
         [0012]    To achieve these objects mentioned above, the present invention provides a measuring system module which is used to measure a printed circuit board, including: a first robot having a pogo pin, wherein the first robot could be moved to a testing point of a first surface of the printed circuit board and the pogo pin could be connected with said first testing point; a second robot having another pogo pin, wherein the second robot could be moved to a testing point of a second surface of the printed circuit board and the pogo pin could be connected with the second testing point; a meter, which is used to enter/receive testing signal to the pogo pins; and a control system, which is used to control the first robot and the second robot to move, and control the meter to provide and receive testing signal; and the testing signal from the meter could be transmitted to the control system for defining and analyzing the testing signal. 
         [0013]    Therefore, the electricity of the printed circuit board could be tested accurately, and the un-standard printed circuit boards are picked up in time. The efficiency and quality of the printed circuit board is ensured for following production. The better is that the testing system module of the present invention could be controlled by a controlling system, and the testing system module could be a automatic system thereby the cost of manpower could be saved. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0014]      FIG. 1  is a diagram of a measuring system module of one embodiment of the present invention. 
           [0015]      FIG. 2  is a diagram of a shielding case of the measuring system module of one embodiment of the present invention. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0016]    Some embodiments of the invention will now be described in greater detail. Nevertheless, it should be noted that the present invention can be practiced in a wide range of other embodiments besides those explicitly described, and the scope of the present invention is expressly not limited except as specified in the accompanying claims. Note that, the components of the different elements are not shown to scale. Some dimensions of the related components are exaggerated to provide a more clear description and comprehension of the present invention. 
         [0017]      FIG. 1  shows a testing system module  1  of one embodiment of the present invention. The testing system module  1  comprises a testing part and a meter  41 . The testing part is one kind of flying test equipment, which comprises a first robot  21  and a second robot  22 . In here, the first robot  21  has a pogo pin  211 . The printed circuit board  10  comprises a two-side printed circuit board, which has a first surface and a second surface. When testing the printed circuit board  10 , the pogo pin  211  of the first robot  21  is contacted with a first testing point of the first surface of printed circuit board  10 . The second robot  22  also has a pogo pin  211 . Similarly, when testing the printed circuit  10 , the pogo pin  211  of the second robot  22  is contacted with a second testing point of the second surface of printed circuit board  10 . The purpose of using pogo pin is to avoid the testing point of printed circuit board to be damage. In this embodiment, the first robot  21  and the second robot  22  are xyz orthogonal robots, but do not limit to this. The xyz orthogonal robot is one kind of robot which could be moved along X axis, Y axis, and Z axis that the three axes are perpendicular each other. 
         [0018]    The meter  41  is a meter which comprises a test signal generator and a detector. In this embodiment, the meter comprises a source meter, and the source meter could provide an accurately voltage signal and measure extreme low leakage current. The meter  41  is connected with the first robot  21  and the second robot  22  by signal transmission lines  71 . Therefore, the electricity, such as short circuit, open circuit and leakage current, of the printed circuit board  10  could be tested by the meter  41  which is used by the pogo pin  211  of the first robot  21  and the pogo pin  211  of the second robot. Moreover, the source meter could measure nano-ampere level leakage current. Furthermore, the signal transmission line  71  covers a metal layer, which is used to avoid the effect of outside electromagnetic interference (EMI). 
         [0019]    The testing system module  1  further comprises a control system  51 , which is connected with the meter  41 , the first robot  21  and the second robot  22 . The control system is used to control the meter to provide a voltage to pogo pins of the first robot and the second robot. Moreover, the testing signal tested by meter  41  is received by the control system for defining and analyzing the testing signal. Otherwise, the coordinates of the first robot  21  and the second robot  22  could be controlled by the control system. The testing system module further comprises a movement driver  31 , which is disposed between the control system  51  with the first robot  21  and second robot  22 . The movement driver  31  could receive the instruction from the control system  51  and drive the first robot  21  and the second robot  22  moving to the testing position. 
         [0020]    As shown in  FIG. 2 , the testing system module  1  further comprises a shielding case  61 , which is used to cover the testing part to reduce outside electromagnetic interference when the printed circuit board is testing. It&#39;s meant that the shielding case  61  covers the first robot  21 , the second robot  22  and the printed circuit board  10 . The material of shielding case  61  comprises metal, thus, it&#39;s efficient to reduce outside electromagnetic interference. 
         [0021]    In this embodiment of the present invention, the process that the printed circuit board is tested by the testing system module  1  is described as follow: 
         [0022]    First of all, the coordinate of the testing point of the printed circuit board is read by the control system  51 . And, the coordinate of the testing point would download automatically by the movement driver, which would control the first robot  21  and the second robot  22  to move along X axis, Y axis, and Z axis that the three axes are perpendicular each other. Moreover, the pogo pin  211  of the first robot  21  could be moved to contact the first testing point of the first surface of the printed circuit board  10 , and the pogo pin  211  of the second robot  22  could be moved to contact the second testing point of the second surface of the printed circuit board  10 . 
         [0023]    Then, the control system  51  is transferred to the meter  41  by transfer protocol. The testing signal from the meter  41  is transferred to the pogo pins of the first robot  21  and the second robot  22 , and the pogo pins transfer the voltage to the testing points of the printed circuit board  10  for testing. The testing process comprises short current, open current and leakage current, wherein the leakage current testing could test the extreme low leakage current. Moreover, the testing data could be transferred to the control system  51  by the meter  41 , and the testing data of printed circuit board  10  could be defined and analyzed by the control system  51 . 
         [0024]    Otherwise, two printed circuit boards could be tested at the same time by the testing system module of the present invention. When the one-end testing point of the two printed circuit boards is grounded, the two printed circuit boards could be tested at the same time by the testing system module  1 . 
         [0025]    Therefore, the testing part of the testing system module of the present invention has the advantage of the flying probe test equipment, and the first robot and the second robot are set on two side of the printed circuit board. When testing the printed circuit board, it only has two probes to move on x, y, and z axes and to test any testing point of printed circuit board. Therefore, it doesn&#39;t need more expensive fixture for testing, and extreme high-density printed circuit board could also be tested by the testing system module of the present invention. Otherwise, the testing system module of the present invention comprises a meter  41  would could provide high voltage and receive extreme low current, thus, the testing system module could test nano-ampere level leakage current of the printed circuit board which would be set to high voltage and standard of leakage current is high. Therefore, the electricity of the printed circuit board could be tested accurately, and the un-standard printed circuit board could found in time. The efficiency and quality of the printed circuit board is ensured for following production. 
         [0026]    The advantage of the testing system module of the present invention is that the testing system module is an automatic system. Because the meter, the first robot, and the second robot are all connected to the control system, and the voltage and testing data from the meter and the movement of the first and second robots are controlled by the control system. Therefore, it is an automatic system thereby the cost of manpower could be save. 
         [0027]    The specific arrangements and methods herein are merely illustrative of the principles of this invention. Numerous modifications in form and detail may be made by those skilled in the art without departing from the true spirit and scope of the invention as defined by claims.