20 Jul
2016
20 Jul
'16
2:08 p.m.
On Jul 19, 2016, at 4:58 PM, Wayne Sudol <wsudol at
freedom.com> wrote:
Laser technology to draw things like this is used in photo typesetters. A
laser beam is focused onto a thin (about 1/2" thick) many sided (about 8
sides i think) spinning mirror. Each facet of the mirror is cut differently
to deflict the beam up, down or center it on a sheet of moving paper or a
plate of sensitized aluminum.
Depending on the typesetter, the spinning mirror might just be horizontal deflection, with
vertical positioning provided by the film transport motor. But in any case, those are
raster scan systems. It's very easy to scan a light beam in a regular pattern at high
speed, with schemes like this.
DLP (micro-mirror chips) are also raster systems.
paul