dave wrote: > The dry film resist sounds like an easy way to go. Photoresist just has > to be the way to go for encoders. I suspect one could even silver glass > like mirrors used to be made; if is darkens over time that might just > help the contrast. Only real problem is that the silver layer is pretty > fragile. > Most of these glass scales and glass encoder discs have very thick chrome and it is pretty much as hard as the glass. I'm not sure how they do it, they might start with a very thin nichrome layer, pattern it with resist, etch and then pattern plate the thicker layer on, or just vacuum deposit it thick and etch it as is. Still, you have to be careful the scale and analyzer grating never touch.
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