1. STEPPER MOTOR LASER
2. SCANNING LASERS
3. ILDA SCANNING
INSIDE THE LASER PROJECTOR
Most of the lasers sold on eBay use stepper motors which have large mirrors attached to reflect the laser beam on the X and Y axis. The stepper motor moves the mirrors at very small angles projecting the laser beam. This speed is about 3-4K and cannot reproduce clear graphics or patterns. They usually are limited to unintelligible lines projected against the far wall. The beam effect from stepper motors when compared with scanning lasers clearly inferior.
Laserists should be familiar with the stepper motor equipped lasers and how they are often old recycled technology cranked out en mass from China.
See the interesting video presentation at this link;
STEPPER MOTOR SHORTFALLS
The beam appears jerky and does not have smooth transitions
Programs are limited
The stepper motor is usually noisy
The stepper motor is usually quite large and add cosiderable weight to the unit
The stepper motor usually has poor quality reflective glass
They are cheap and there are companies that re-use second hand motors and sell as new in their lasers
SO WHAT DO SCANNERS DO?
The laser projector is the heart of a graphics system. It contains the galvanometer scanners and scanner amplifiers, which together move the beam FASTenough to create graphics. It also contains an intensity device that blanks and/or colors the laser beam. This section discusses these two vital parts of a projector.
There can be other parts, such as beam tables and lumia special effect devices. However.
This brief introduction is aimed to stimulate intereset in scanners. It is a moderately intensive subject with debate on the ILDA laser scan speed test and is good reading if you you are thinking of moving eventually into laser graphics.