Metal working – Method of mechanical manufacture – Electrical device making
Patent
1989-07-19
1990-07-17
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
29840, 219 1041, 219 1043, 219 1057, 219 1065, 228103, 228105, 228179, 358101, H05K 330
Patent
active
049412566
ABSTRACT:
A method for inspecting the placement and alignment of surface mounted components on printed circuit boards during assembly. After the component is placed on the board, an infrared camera provides an image of leads on the component and corresponding soldering pads, to which the leads are to be soldered, on the board in a single exposure. The image is then processed by a computer and the position and orientations of the leads of the component with respect to the soldering pads are determined. As a result, any unsatisfactory misalignment of the component can be detected and defective printed circuit boards identified.
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IBM Tech Discl Bull, vol. 22, No. 9, Feb. 1980, by T. Ross et al, p. 4068.
IBM Tech Discl Bull, vol. 27, No. 6, Nov. 1984, by M. S. Chester et al, pp. 3653-3655.
IBM Tech Discl Bull, vol. 30, No. 7, Dec. 1987, pp. 381-382.
Capson David W.
Tsang Randy
Arbes Carl J.
Canadian Patents & Development Ltd.
Hall Carl E.
Kelly Harold A.
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