Process for optically testing circuit boards

Details Process for optically testing circuit boards Process for optically testing circuit boards

G - Physics

01

N

356/2

G01N 21/88 (2006.01) G06T 7/00 (2006.01)

Patent

CA 1257009

ABSTRACT OF THE DISCLOSURE A circuit board having conductor tracks is optically tested for functional faults by use of a computer controlled testing apparatus including at least one camera. The surface of the circuit board is scanned in a point-by-point manner by the camera to establish for each point scanned an image representative indicative of a conductor track area or a non-conductor track area. The surface of the circuit board is divided into a predetermined plurality of windows of predetermined size, and the image representations are associated with respective windows. For each window a determination is made of the sum of only the points of the window corresponding to a conductor track area or the sum of only the points of the window corresponding to a non-conductor track area. This establishes an identification value descriptive of the particular window. The identification values of the windows of the circuit board being tested are compared with predetermined values of corresponding respective windows of a reference master.

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