| 摘要 |
An ultraviolet-transmitting glass window assembly comprising a metallic mounting ring containing an ultraviolet-transmitting glass is made by placing a preformed ultraviolet-transmitting glass member in the center of the metallic ring which has a higher coefficient of thermal expansion than the glass, heating the resulting assembly to melt the glass whereby it completely fills the ring, and cooling the assembly whereby a compression seal is achieved due to the greater shrinkage of the metallic ring. This window assembly is sealed over the memory chip of a programmable read only memory package to provide for ultraviolet erasure of the program information stored in the memory device.
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