VIDEOJET 3140 - 4 Description of the Laser System; 4.1 Function Principle of a Vector-Scanning Laser System

4 Description of the Laser System
4.1 Function Principle of a Vector-
Scanning Laser System
The laser (2) working in pulsed or continuous operation produces an infrared in-
visible laser beam with small diameter. The laser beam is expanded by means of
two-lens telescope (3).
The expanded beam reaches the marking head (4) where two movable mirrors
deflect it such that it passes over the lines of the opened template on the product.
The lines are divided into vectors (X and Y coordinates). The line up of vectors
produces a marking on the product, the laser »writes« on the product surface.
The calculation of vectors and the control of the laser is performed by the control-
ler card in the supply unit (1).
The deflected laser beam is focussed onto the product surface (7) by a laser scan
lens (5). Generally the marking is produced at the focus of the lens (6).
4.2 The Laser Beam Source
A sealed-off CO
2
laser serves as beam source for the laser system. Inside the la-
ser source CO
2
-molecules are stimulated by a high-frequency voltage to emit in-
frared laser radiation.
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Videojet 3140/3340/3640/4 Description of the Laser System