Patent ID: 6019231
Filing Date: 2000-02-01
Classification: B29C,H01L

Abstract:
A wafer cassette comprising:parallel grooves for receiving a plurality of wafer materials in alignment; andthick-walled reinforcement parts respectively having wall thicknesses of at least 3 mm;wherein each of said thick-walled reinforcement parts has a V-shaped positioning groove formed therein each of said V-shaped positioning grooves having inclined surfaces for contacting and aligning a positioning pin of an automatic wafer loading/unloading machine to accurately position the loading/unloading machine;wherein each of said thick-walled reinforcement parts is formed unitarily with and as an integral part of said wafer cassette; andwherein each of said thick-walled reinforcement parts has at least one hollow cavity formed therein at said respective V-shaped positioning groove to define cavity walls thereabout having cavity wall thicknesses which are thinner than the respective thick-walled reinforcement part, said at least one hollow cavity being formed at said respective V-shaped positioning groove such that said inclined surfaces are free of concavity formed by molding shrinkage.