Metal working – Means to assemble or disassemble – Means to assemble electrical device
Patent
1996-10-25
1998-06-02
Vo, Peter
Metal working
Means to assemble or disassemble
Means to assemble electrical device
29743, 29DIG44, 228 41, 228246, 279 3, 294 641, H01L 2160, H05K 1300, B23K 306
Patent
active
057584095
ABSTRACT:
An apparatus for placing electrically-conductive balls on electrodes of workpieces so as to form projected electrodes includes a ball-placing head which picks up the conductive balls from a reservoir. Suction holes for respectively suction-holding the conductive balls are formed in a lower surface of a box member of the ball-placing head. Recesses are formed respectively in portions of this lower surface where the suction holes are not formed. The box member of the ball-placing head is caused to rest on an upper surface of layers of conductive balls stored in a container of the reservoir. In this condition gas is blown or injected into the container so as to fluidize the conductive balls. At this time the gas flows upward into the recesses in the lower surface of the box member, thereby sufficiently fluidizing the whole of the upper layer of conductive balls, so that all of the suction holes can effectively and securely pick up and hold the conductive balls. The recesses direct the gas flow from the center portion of the lower portion of the box member to the periphery of the ball-placing head.
REFERENCES:
patent: 4462534 (1984-07-01), Bitaillou et al.
patent: 5205896 (1993-04-01), Broun et al.
patent: 5467913 (1995-11-01), Nanekawa et al.
patent: 5601229 (1997-02-01), Nakazato et al.
patent: 5615823 (1997-04-01), Noda et al.
patent: 5626277 (1997-05-01), Kawada
Matsushita Electric Industrial Co. Ltd
Vo Peter
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