Package for semiconductor device

Details Package for semiconductor device Package for semiconductor device

1984-06-21

1988-03-15

Fears, Terrell W.

Static information storage and retrieval

Hardware for storage elements

365244, G11C 1300

Patent

active

047317531

ABSTRACT:
A package suitable to contain therein a semiconductor memory element erasable of the stored information by irradiation with ultraviolet rays on the element with no fear of weak ultraviolet rays such as contained in natural light undesirably acting on the semiconductor memory device to erase the information.
In the package, a lid for closing a cavity over an insulating base, the insulating base having mounted thereon the semiconductor element, has an ultraviolet transmission glass provided at a portion thereof opposite to the semiconductor device, and the glass has at least one surface formed into a rough surface having a transmittance of ultraviolet rays of 80% or less.
Thus, the ultraviolet transmission glass is lower in transmittance due to the rough surface and The transmission of the weak ultraviolet rays is intercepted by the rough surface, whereby the information stored in the semiconductor memory element is not undesirably erased by the weak ultraviolet rays.

REFERENCES:
patent: 3924246 (1975-12-01), Scherer
patent: 4502130 (1985-02-01), Kuckuk
patent: 4519050 (1985-05-01), Folmsbee
patent: 4530074 (1985-07-01), Folmsbee

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