Patent ID: 6015280
Filing Date: 2000-01-18
Classification: B29C

Abstract:
Apparatus for forming molded plastic electronic packages, said apparatus comprising:a source for viscous encapsulant;means, in operative combination with said source for viscous encapsulant, for inducing pressure on said encapsulant;a mold for forming said packages;compliant gate means, in operative combination with said source for viscous encapsulant, said means for inducing pressure on said encapsulant, and said mold, said compliant gate means for providing a path from said source for viscous encapsulant to said mold and for reducing warpage in said plastic electronic packages;a second mold for forming said packages;a second compliant gate means in operative combination with said source for viscous encapsulant, said means for inducing pressure on said encapsulant and said second mold, said second compliant gate means for providing a path from said source for viscous encapsulant to said second mold and for reducing warpage in said plastic electronic packages wherein said second compliant gate means is a shallowly tapered gate, which has an included angle in the range of about 4.degree. to about 7.degree.;a third mold for forming said packages;a third compliant gate means in operative combination with said source for viscous encapsulant, said means for inducing pressure on said encapsulant and said third mold, said third compliant gate means for providing a path from said source for viscous encapsulant to said third mold and for reducing warpage in said plastic electronic packages wherein said third compliant gate means is a shallowly tapered gate, which has an included angle in the range of about 4.degree. to about 7.degree.;a fourth mold for forming said packages; anda fourth compliant gate means in operative combination with said source for viscous encapsulant, said means for inducing pressure on said encapsulant and said fourth mold, said fourth compliant gate means for providing a path from said source for viscous encapsulant to said fourth mold and for reducing warpage in said plastic electronic packages wherein said fourth compliant gate means is a shallowly tapered gate, which has an included angle in the range of about 4.degree. to about 7.degree.; and wherein said compliant gate means is a shallowly tapered gate wherein said shallowly tapered gate has an included angle in the range of about 4.degree. to about 7.degree., and wherein all included angles of every compliant gate means in operative combination with said source for viscous encapsulant including the included angle of the compliant gate means, the included angle of the second compliant gate means, the included angle of the third compliant gate means, and the included angle of the fourth compliant gate means, are all equal to each other.