Graphics laser projectors :
Graphics projectors use "scanners" to move the beam fast enough to make
detailed images projected on a screen or wall. Graphics projectors can draw outline
images of pictures, logos, text and other complex shapes, having only one limit -the
scan rate -. Graphics projectors can also make patterns and beam shows. Patterns
are simple geometric shapes like circles, squares and stars. They can also be complex
3D shapes like the ball at right, as well as psychedelic, hypnotic abstract images
from classic planetarium-type shows.
According with ILDA international standard, scanners are divided in 4 subdivisions:
- ILDA 60K (60,000 points per second) is the fastest possible
- Scanners from about ILDA 30K to 60K are considered professional quality
- Scanners from ILDA 12K to about 24K are considered acceptable quality for graphics
- Scanners slower than 12K this are best suited for making patterns
Usually the images made by a graphics laser projector are outline (vector) drawings.
However, it is possible to do low-resolution TV-like raster graphics as well (Pangolin
Laser Systems INC ).
Pattern laser projectors :
Some lower-cost projectors use slow scanners (below ILDA 12K) or stepper
motors to move the beam.
These "pattern" projectors can show simple geometric shapes like circles,
squares and stars on a screen or a wall. They are not suited for showing logos, text,
detailed shapes or other complex graphics.
Beams laser projectors :
There are 2 types of beam projectors :
- Beam tables use a small number of mirrors (typically between 6 and 24) to re-direct
the laser beam. Each beam position can aim at a target such as a bounce mirror, or
can create an effect such as a spray of smaller laser beams. A beam table can aim
the beam very accurately and repeatably to bounce mirrors, but it has a limited number
of positions.
- Beam projectors use two scanners or stepper motors which aim tiny mirrors under
computer control. Together, the two scanners can aim the beam anywhere in front of
the projector
