Stock material or miscellaneous articles – Structurally defined web or sheet – Discontinuous or differential coating – impregnation or bond
Patent
1991-09-10
1992-12-29
Ryan, Patrick J.
Stock material or miscellaneous articles
Structurally defined web or sheet
Discontinuous or differential coating, impregnation or bond
428901, 428913, 428457, 428413, 4284735, 428192, 428198, 361398, 361414, 174250, 430 5, 430313, B32B 900
Patent
active
051750473
ABSTRACT:
In a process for manufacturing a rigid-flex printed circuit wherein a rigid insulating layer supports one portion of the printed circuit and a flexible insulator supports another portion thereof to furnish flexible leads for connection the printed circuit to an operative device, a first assembly is provided comprising a curable prepreg insulator layer having an opening for the flexible leads. A flexible sheet spans the opening, and the assembly is pressed with one surface in contact with a smooth hard surface while the other surface is supported by a flowable curable prepreg layer. The insulator and flowable layers are a release layer which prevents bonding between the prepreg layers throughout most of the areas while permitting bonding along the edges. The assembly is maintained under heat and pressure to partially cure both prepreg layers and bond the flexible sheet to the edges of the opening and bond the edges of the prepregs together to form a flat rigid sandwich. A sheet of copper is bonded to that surface previously in contact with the hard surface. In a second pressing operation the copper is bonded to both the partially cured prepreg layer and the flexible sheet, and thereafter the bonded edges of the cured prepreg layers, are severed to permit separation of the cured prepreg layers.
REFERENCES:
patent: 3393392 (1968-07-01), Shelley
patent: 4687695 (1987-08-01), Hamby
patent: 4800461 (1989-01-01), Dixon et al.
IBM Tech Discl. Bulletin, vol. 14, No. 3, Aug. 1971, pp. 701-702.
Caron Roland
Dixon Herb
McKenney Darryl J.
Millette Lee
Lee Cathy K.
Ryan Patrick J.
Teledyne Industries Inc.
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