The cable is usually short, to provide the most accurate feedback signals between the scanners and the amp. Before you buy Before you buy scanners, be sure you know exactly what you're getting. This term means that the projector is not intended for accurate computer control. It usually uses open-loop scanners with simple amps. Should you be purchasing new scanners, note that there is often a backlog.
Lead times can be as much as ten weeks.
Most graphics projectors use some type of blanking device, to turn off the laser's beam as it moves between the visible lines of a drawing. The advantage of galvo blanking scanners is their compatibility with galvo mirror scanners. The disadvantage is that this response time is relatively slow. It is not enough to simply use an arm which rotates in and out of the beam. Complex, multi-mirror optical paths are required, so that a small movement of the blanking galvo can instantly cut off the laser beam.