Patent ID: 8703598
Filing Date: 2014-04-22
Classification: H01L

Abstract:
1. A manufacturing method of a lead frame substrate, comprising: either coating a photosensitive resist on or attaching a dry film to a first surface and a second surface of a metal plate; pattern-exposing the photosensitive resist or the dry film on the first surface and the second surface, and then developing the first surface and the second surface to form on the first surface a first resist pattern for forming a connection post and to form on the second surface a second resist pattern for forming a wiring pattern; etching the first surface of the metal plate partway down the metal plate to form the connection post; filling the first surface of the metal plate with a pre-molding resin to a thickness with which the etched surface is buried; removing the pre-molding resin uniformly in a thickness direction of the pre-molding resin until a bottom surface of the connection post is exposed; and etching the second surface of the metal plate to form a wiring pattern.