Semiconductor memory device
AssigneeNEC Corporation
InventorsAkitoshi Saitou, Mikio Bessho
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Abstract
An UV-EPROM has a window for transmitting ultra-violet rays during the erasing operation, which is covered by a shading sheet including a metallic film, a polyimide film laminated on the upper surface of the metallic film, and a bond film attached to the lower surface of the metallic film.
Claims4
A semiconductor memory device comprising a semiconductor memory chip of such a type that information stored therein is erased by ultra-violet rays, a package housing said chip therein, a window plate hermetically fixed to said package, said window plate being transparent to ultra-violet rays, and a shading sheet adhering to said window plate, said shading sheet including a bond film, a metallic film on said bond film and a polyimide film on said metallic film.
A shading sheet for convering a window of a package of UV-EPROM, said shading sheet having a laminate structure including a bond film, a metallic film on said bond film, and a polyimide film on said metallic film, said bond film, metallic film and polyimide film having the same plane shape.
Dependencies are inferred from the claim text.