Patent ID: 8079477
Filing Date: 2011-12-20
Classification: H01L

Abstract:
1. A cushioned wafer container comprising: a plurality of wafer trays for retaining semiconductor wafers, respectively, said wafer trays being superimposed over each other to accommodate a semiconductor wafer placed over each of said wafer trays in an interior space formed between said each of said wafer trays and another of said wafer trays that is adjacently superimposed thereover; an elastic wafer-retaining cushion sheet disposed at a wafer retaining position on a top of each of said wafer trays, said wafer-retaining cushion sheet comprising an integrated stack of an upper cushion layer functioning as an elastic cushion and a lower suction-adhering layer having a releasably suction-adhering surface that releasably adheres by suction to the top of said each of said wafer trays; said releasably suction-adhering surface being formed by a multiplicity of minute suction cups, so that pressing said minute suction cups against the top of said each of said wafer trays causes said minute suction cups to be secured by suction to the top of said each of said wafer trays; wherein said wafer-retaining cushion sheet has a suction-adhering layer formed on a side thereof that contacts said semiconductor wafer, said suction-adhering layer being integrally stacked on said cushion layer and having a releasably suction-adhering surface that releasably adheres by suction to said semiconductor wafer; and wherein an adhesive force of said wafer-retaining cushion sheet relative to said semiconductor wafer is set smaller than an adhesive force of said wafer-retaining cushion sheet relative to said wafer tray.