Invention Grant
US07791209B2 Method of underfill air vent for flipchip BGA 失效
用于倒装芯片BGA的底部填充气孔的方法

Method of underfill air vent for flipchip BGA
Abstract:
This invention relates to ejecting an underfill resin at multiple semiconductor die edges such that vacuum suction provided at a laminate through hole located beneath a stage enables spread of underfill resin from each edge simultaneously for quicker spread and reduction of voids. The excess underfill resin intentionally suctioned through the through hole air vent on the underside of the laminate is attracted to re-usable tape. The attracted underfill resin is cleaned from a rotating head mechanism by a cleaning pad positioned beneath a lower surface of the head.
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