Metal fusion bonding – With means to juxtapose and bond plural workpieces – Wire lead bonder
Patent
1991-06-03
1992-12-08
Seidel, Richard K.
Metal fusion bonding
With means to juxtapose and bond plural workpieces
Wire lead bonder
228 45, 335179, B23K 3700, H01F 708
Patent
active
051690500
ABSTRACT:
To provide the necessary vertical motion of a wire- bonding head (20) mounted on a flexural pivot (16), a wire-bonding machine (10) includes an actuator comprising a permanent magnet (56) mounted on the flexural pivot (16) and extending into the central passage (49) of a ferromagnetic sleeve (46) in which two oppositely wound coils (50 and 52) are mounted. The magnetic force resulting from current flow through the coils (50 and 52) causes the head assembly (18) to pivot about the flexural-pivot axis (16) and thus cause the magnet (56) to move out of symmetry with respect to the ferromagnetic sleeve (46). The resultant attraction between the permanent magnet (56) and the ferromagnetic sleeve (46) tends to counteract the resistance of the flexural pivot (16) to pivotal displacement from a rest position but does not additionally reduce the stiffness of the flexural pivot to other, undesired modes of motion.
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General Scanning Inc.
Knapp Jeffrey T.
Seidel Richard K.
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