3 Oct
2000
3 Oct
'00
7:15 a.m.
I wrote:
Hopefully a *quartz* window. Otherwise it will be
difficult to erase.
John A. wrote:
Hey I'm just an initiate on these things. Most
modern
EPROMs seem to have poured (once liquid) windows, older
ones have the sliced crystalline slab windows. You mean
to say thet the solidified windows are quartz also?
I thought the M.P. of Quartz was astronomically high.
I'm not sure. But glass is fairly opaque to shortwave UV,
so a glass window won't work too well.
I have some OKI plastic-packaged EPROMs that have a
plastic window. The window is translucent to visible
light, but apparently reasonably opaque to shortwave UV.
OKI didn't make them for very long; I guess they weren't
a big hit. I've heard that the window becomes less
transparent to UV as exposure increases.