Vitrolux H
V2
Product description
Stand 5/12
Page 29 of 57
3.3 Scanner
The scan head serves for the laser beam deflection in two levels.
The deflection is performed by means of two galvanometer mirrors.
At scan head is a focussing optic which focuses the laser beam.
The scanner deflects a parallel bundle of beams in the X-Y direction (see Figure 3).
The beam enters the scan head via the inlet aperture. Inside the unit, the beam first hits
mirror 1 on galvanometer scanner 1 and is deflected to mirror 2 on galvanometer
scanner 2.
The deflection angle is determined by the controllable position of the galvanometer scanner.
The beam emerges from the scan head through the outlet aperture, which is equipped with
an F-theta lens.
The F-theta lens focuses the parallel bundle of beams to the image field level. The lens
creates an exact proportionality between the angle of incidence of the beam and the position
of the focused image point in the image field.
The square image field experiences a positive-negative field distortion due to the course of
the beam on the mirrors and the lens. The field distortion must be compensated for by the
control drive.
The scan head designed for a parallel bundle of beams with a maximum diameter, referred
to as the aperture. An incoming beam may not exceed this diameter in the unit.
The scanfield takes 70 by 70 mm in float glas.
Figure 3: Scan head principle of function
(1)
incoming beam
(2)
Mirror 1
(3)
Galvanometer scanner 1
(4)
Mirror 2
(5)
Galvanometer scanner 2
(6)
F-Theta-lens
(7)
Beam emission
(8)
Image fiels level
