Metal working – Method of mechanical manufacture – Electrical device making
Patent
1989-11-15
1990-07-17
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
29407, 29740, 29840, 33645, 156 64, 156235, 156241, 437218, H05K 330
Patent
active
049412558
ABSTRACT:
A plurality of semiconductor chips are first attached to a transparent mask by placing indica marks on the mask and then viewing the chips through the mask and aligning them to the indica marks. The chips, which are held on a vacuum pedestal, are then brought into contact with the mask and a temporary adhesive layer holds the chips to the mask. The vacuum is then released. The mask with the chips attached thereto is then aligned to a printed circuit (wiring) board having indica marks thereon by viewing through the mask and moving the chips and printed circuit board together until they contact each other. A permanent adhesive layer holds the chips to the printed circuit board. The temporary adhesive layer is then dissolved and removed from the chips.
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Arbes Carl J.
Eastman Kodak Company
Hall Carl E.
Owens Raymond L.
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