--- In NEONIXIE-L@..., Mike Harpe <mike@...> wrote:
I am interested in learning more about the so-called "projection"
displays that were used in a lot of 1970s industrial rack-mount type
clocks.
Does anyone on here have a reference or source for them?
Thanks!
Mike Harpe
Sellersburg, IN USA
They're pretty simple devices. A matrix of miniature incandescent lamps illuminates text printed on photographic film and is focused onto a screen by a matrix of molded plastic lenses. If there was demand, it would be cheap to produce with modern injection molding but you would have to make a LOT of them before the price was reasonable. Unlike Nixie tubes, there is no esoteric equipment or "magical" formulas of materials and gas fill required.
