Metal working – Method of mechanical manufacture – Electrical device making
Patent
1989-12-14
1991-01-01
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
29740, 29759, 29720, 414730, 901 40, 901 47, H05K 330, B23P 1900
Patent
active
049809717
ABSTRACT:
A system (10) for precisely placing a semiconductor chip (16) on a substrate (11) includes a robotic arm (18) which is provided with a gripper (22) for separately picking up the chip and substrate. A first television camera (38) is carried by the robotic arm and serves to capture the image of the substrate to locate a pair of datum points (71a and 71b) thereon. A second camera (40), stationary with respect to the robotic arm, serves to capture the image of the chip (16), when engaged by the robot, to locate each of a pair of datum points (83a and 83b) thereon. A machine vision system (46) serves to process the output signal of the cameras (38) and (40) to establish the precise location of the datum points on the substrate and on the chip. The information from the vision system (46) is employed to control the robotic arm to cause the gripper to place the chip on the substrate such that each of the datum points on the substrate is at a prescribed location relative to a separate one of the datum points on the chip.
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Bartschat Michael K.
Kovalchick Joseph S.
Arbes Carl J.
AT&T Bell Laboratories
Hall Carl E.
Levy Robert B.
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