Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-11-12
1988-05-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356394, 382 8, G01N 2188, G06K 900
Patent
active
047452960
ABSTRACT:
A circuit board having conductor tracks is optically tested for functional aults 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 respresentative 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.
REFERENCES:
patent: 4559603 (1985-12-01), Yoshikawa
patent: 4635289 (1987-01-01), Doyle et al.
Driller Hubert
Mang Paul
Allen Stephone B.
Mania Elektronik Automatisation Entwicklung und Geratebau GmbH
Nelms David C.
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