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It seems to me that you could draw transparent 0.28 mm windows around a spiral of correct diameter within a black background circle in a PC drawing application and print the resulting drawing on a transparency to form a "mask" for each disc. You could glue the transparency to one side of the disc. Each 0.28 mm square window would fit over a corresponding one of the 0.6 mm round apertures to form a square transparent disc aperture of correct size.Panrock wrote:Unfortunately the discs are not satisfactory. The mean hole diameter is 0.6mm round, not 0.28mm square.
You might want to try transparent optical discs before you give up. Transparent discs would theoretically improve the light transfer 80 times because all the light transfers through a single line, that is, the edge of the disc, rather than the area of the image. You could embed translucent pits of desired depth and spiral pattern into one side of each disc with a laser or drill.Panrock wrote:Moreover, even with 0.6mm holes and 12 luxeons illuminating it, I've noticed the brightness of the display is now only just sufficient. With 0.28mm holes it would be a quarter of this. Any further losses due to the acetate would be a serious matter.
I'm now reconsidering; and am beginning to think a 50-line display with square holes would be more practical for this size of disc.
Panrock wrote:PS. Albert our posts have crossed - I've just seen your next suggestion. I think this would not work so well in practice because at the very tiny scale involved, it would be difficult to produce a really clean and perpendicular corner - and 160 times over too!
S
Panrock wrote:... I'm now trying shoe polish wax.
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