Metal working – Method of mechanical manufacture – Electrical device making
Patent
1987-11-12
1988-10-11
Eley, Timothy V.
Metal working
Method of mechanical manufacture
Electrical device making
29407, 29721, H05K 330, B23Q 1700
Patent
active
047760885
ABSTRACT:
Surface mounted electrical components are typically assembled on printed wiring boards by automatic machines. It is important that the machines accurately move with respect to both X and Y rotational axes in order to insure that components are positioned precisely on connector pads of the printed wiring board being assembled. In accordance with the instant invention, a gauge is used to facilitate convenient accuracy checks. The gauge is a glass substrate on which grids of 0.005 inch lines are scribed to form location and orientation fields where components are to be placed. The grids are referenced from either fiducial marks or the edge of the substrate to establish known positions within the grids. The equipment to be evaluated is programmed to place components in known positions and the components are held in place by tacky adhesive that is sprayed on the substrate prior to placing the components. The accuracy of the component position is then compared to the programmed position by placing the substrate on a light table and observing the component location. If a significant inaccuracy with respect to any of the axes exists, the inaccuracy is apparent because the component is not aligned properly with the grid. If a precise measurement of an axis inaccuracy is desired, a measuring microscope may be utilized.
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Biggs Peter M.
Dancer Linda K.
Yerganian Simon S.
Arles Carl J.
Chafin James H.
Daniel Anne D.
Eley Timothy V.
Hightower Judson R.
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