Narrow-Bandwidth Television Association

Today I've slaughtered my old laser printer, which had some mechanical problems due to cheap plastic gears. But the optical part looks quite interesting: On the left you see the laser, some mirrors, the spinning hexagon mirror, and optics to form a proper line on the paper. The laser seems to be quite strong and therefore not harmless for experiments! I doubt that the motor under the hexagon mirror is fast enough for NBTV, but could be replaced. The printer was able to print 600 dots per inch, that would make a high resolution picture! I also have a big four sided mirror, which I've got a couple of years ago at the convention in Loughborough from Peter Yancer. I wonder if it will be possible to make a Scophony-like scanner with this parts. Of course I will replace the laser with a common LED, something around 60 lines/25 frames would be enough to start.

DrZarkov wrote:Today I've slaughtered my old laser printer, which had some mechanical problems due to cheap plastic gears. But the optical part looks quite interesting: On the left you see the laser, some mirrors, the spinning hexagon mirror, and optics to form a proper line on the paper. The laser seems to be quite strong and therefore not harmless for experiments! I doubt that the motor under the hexagon mirror is fast enough for NBTV, but could be replaced. The printer was able to print 600 dots per inch, that would make a high resolution picture! I also have a big four sided mirror, which I've got a couple of years ago at the convention in Loughborough from Peter Yancer. I wonder if it will be possible to make a Scophony-like scanner with this parts. Of course I will replace the laser with a common LED, something around 60 lines/25 frames would be enough to start.

You have a older one here the new ones have gone square yours is a polygon .
The octagon mirror 8 sided one i still have works for nbtv only tried it up to 60 line it could do more yours will do NBTV easy mine was on a older circuit board all you had to do was power the board and use a 555 for the pulse frequency to run the thing yours the circuit might be off board never had luck with those but infact you will not get a faster motor than these things mine was doing 60 line and still had more speed
viewtopic.php?f=1&t=1557&hilit=octagon
I have tried a led view direct off the mirror that would work yes ...laser would be better one with a focus defocus lens to adjust the line width which really needs thickening for 32 line as you see on my photos laser line way to thin .