Patent ID: 6306331
Filing Date: 2001-10-23
Classification: B29C,B29L,H01L

Abstract:
A method of encapsulating a workpiece comprising the steps of:providing a mold cavity in a mold, the mold cavity having a first volume and a pair of opposed mold surfaces, the pair of opposed mold surfaces being inner surfaces on a pair of opposed cavity plates, the cavity plates including corresponding inclined ramp outer surfaces;positioning the workpiece in the mold cavity;holding the mold between a pair of opposed drive plates, each drive plate having an inclined ramp inner surface, the inclined ramp inner surfaces on the opposed drive plates defining a tapered clamp cavity bearing against the inclined ramp outer surfaces on the opposed drive plates; adding mold compound to the mold cavity to encapsulate the workpiece;reducing the volume of the mold cavity to a second volume less than the first volume by moving the mold into the tapered clamp cavity to reduce the distance between the opposed mold surfaces of the mold cavity; andcuring the mold compound.