Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of individual circuit component or element
Patent
1993-01-26
1995-01-10
Karlsen, Ernest F.
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of individual circuit component or element
G01R 1073
Patent
active
053811046
ABSTRACT:
A method for the inspection of a circuit board, capable of precisely detecting deviation in position between the electrodes to be inspected of a circuit board and the inspection electrodes of a tester, thereby achieving fine alignment between the two, with high reliability. The method includes repeating, in two different axial directions, the measurement of conduction state between the electrodes to be inspected of a circuit board and the inspection electrodes of a tester each time changing, by a small distance, the relative position of the inspection electrodes portion of the tester and the circuit board, to detect a position of high conduction state and two positions of low conduction state which are distant from the position and located so that the position is held between them, in each of the two directions. From the information thus obtained, determining the desired connection position in which the inspection electrodes are to be in the highest conduction state in relation to the electrodes to be inspected in one or both of the directions. And then, moving the inspection electrodes portion relatively to the circuit board to place the inspection electrodes in the desired connection position.
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Haruta Yuiti
Kimura Kiyoshi
Yagii Keikichi
Japan Synthetic Rubber Co. Ltd.
Karlsen Ernest F.
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