Metal working – Method of mechanical manufacture – Electrical device making
Patent
1996-09-06
1998-07-28
Vo, Peter
Metal working
Method of mechanical manufacture
Electrical device making
29830, 29851, 29852, 156289, 156323, 174254, 174255, 361750, 427 97, 427 98, 428901, H05K 310, H05K 336, H05K 342, H05K 346
Patent
active
057847827
ABSTRACT:
A method for making a printed circuit with a cavity is disclosed. The method comprises the step of laying a sticker sheet on a first, metallized dielectric layer and laying a second, metallized dielectric layer on the sticker sheet. The second metallized dielectric layer and the sticker sheet each have a window which is registered with the other window forming a cavity. Next, a flexible release layer is laid above the second metallized dielectric layer and a thermosetting visco-plastic material is laid on the release layer over the cavity. Next, the first and second metallized dielectric layers, sticker sheet, release layer and visco-plastic material are laminated by heat and pressure to cure the sticker sheet and thereby bind the first and second metallized dielectric sheets to each other. During the lamination step, the sticker sheet flows to the perimeter of the cavity. However, the pressure forces the visco-plastic material tightly into the cavity to seal a bottom perimeter of the cavity such that the sticker sheet forms a smooth fillet at the bottom perimeter of the cavity.
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Boyko Christina Marie
Farquhar Donald Seton
Japp Robert Maynard
Klodowski Michael Joseph
International Business Machines - Corporation
Samodovitz Arthur J.
Vo Peter
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