Laser marking the AF system is to use the distance sensor to get
the galvanometer to the marking of the workpiece distance, and then
dynamically adjust the marking machine Z axis height, so that it is
always marked with the marking workpiece to maintain a fixed
distance (focal length) .
EZCAD is now the distance value of the sensor, and then calculate
the distance value and set the distance value (need to set the
focal length position in advance) the difference in the search for
the process of moving the focal length Z axis, constantly correct
the distance difference to achieve Autofocus function.
Need to enable auto focus function for laser marking board, and use
EZCAD For Auto Focus version