Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1979-12-18
1981-12-15
Lowe, James B.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264 25, 264248, 156290, 1563084, 1563096, B29C 2704, B29C 2708, B29C 2730
Patent
active
043058973
ABSTRACT:
A process for packaging semiconductors or integrated circuits including semiconductors involves positioning a lead frame on which semiconductors or an integrated circuit are mounted between two thermoplastic resin moldings, at least one of which moldings has a cavity for holding the semiconductors or the integrated circuit and thereafter integrally joining the thermoplastic resin moldings under heat and pressure to the lead frame. An uneven surface is provided on at least a part of the surfaces to be joined of either or both of the two thermoplastic resin moldings. This uneven surface is formed around the cavity in a thermoplastic resin molding having a cavity or on a surface of the thermoplastic resin molding having no cavity which corresponds to the surface to be joined to the other thermoplastic molding having a cavity. The lead frame is interposed or arranged between the two thermoplastic resin moldings so that at least one void is formed between the uneven surface to be joined of at least one of the two thermoplastic resin moldings and the lead frame. The thermoplastic resin moldings are joined by the application of heat and pressure to the lead frame so that at least a part of the at least one void formed prior to joining remains and in this manner harmful flash is prevented from being formed by molten resin produced under the application of heat and pressure.
REFERENCES:
patent: 3219742 (1965-11-01), Reinert
patent: 3341649 (1967-09-01), Jamet
patent: 3960636 (1976-06-01), Moffitt
patent: 4051218 (1977-09-01), Hotton
Hazama Keiji
Maeda Yo
Ohta Shinichi
Hitachi Chemical Company Ltd.
Lowe James B.
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