Apparatus and method for repeatable transfers of liquid deposits
OwnerLaurier A. Woodinventor
Life of this patent
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Abstract
A liquid pick-up, transfer and deposit system achieves controlled thickness, reproducible deposits of viscous liquid, such as epoxy, on a substrate, for subsequent attachment of microscopic size dies, by maintaining a layer of uniform, thickness of the viscous coating in a receptacle and moving an applicator stamp, back and forth between the receptacle and a substrate constituting the workpiece. The deposit area and thickness of coating on the tip of the applicator is kept uniform by a gravity actuated plunger yieldable rearwardly opposed only by its own weight. The plunger tip accommodates itself to the surface it contacts.
Claims10
Liquid transfer apparatus of the type having a source of coating, an applicator including a plunger movable within a housing and an arm supporting said applicator for movement between said source of coating and a work piece said apparatus characterized by
- said source of coating including means for maintaining a layer of controlled, uniform, thickness of viscous coating, and
- said plunger having a tip projecting beyond said housing adapted to pick up a layer of controlled thickness from said source and stamp said layer on said work piece, and having an enlarged rearward portion captive within, but axially slidable relative to said housing for stamping only with the force of gravity determined by the weight of said plunger.
Transfer apparatus for making reproducible epoxy depositions on substrates said apparatus comprising:
- a stamp having a housing with a stamp plunger axially slidable therein, said plunger being of predetermined weight, free floating and having a tip projecting beyond said housing with a tip face of predetermined area;
- epoxy supply means including an open-top, epoxy-containing receptacle having a flat horizontal bottom, a doctor blade in smoothing contact with the epoxy on said flat bottom, and
- means for moving said receptacle and blade in relation to each other to maintain a flat smooth layer of epoxy of uniform thickness, and
- translation means for moving said stamp back and forth in a predetermined horizontal path between said receptacle and substrate and mechanism for raising and lowering said stamp in a vertical path at each opposite end of said path to pick up a predetermined area and thickness of said epoxy on said tip face and deposit the same on said substrate, independent of pressure other than the weight of said stamp
- whereby said free floating plunger automatically compensates for variations in height, or configuration, of said substrate.
Dependencies are inferred from the claim text.