Rockwell Automation 2755-L7, -L9 Scanners - Manual (Page 14)

A–B
3 Chapter
3–1
Installation Considerations
The operation of the scan head is briefly described. In addition, the
importance of proper symbol positioning and the effect pitch has upon a
symbol is also discussed.
Inside the scan head is the laser, the lens and mirror system and the
electronics. The laser generates a small, concentrated light beam that is
focused and projected through a window. This light is reflected by a symbol
and returned to the scan head for processing. The signal is then sent to the
decoder for further processing. Refer to Figure 3.1.
To Label
Reflected light
from symbol
(Diffuse Return)
Figure 3.1
How the Scan Head Operates
Chapter Objectives
How thw Scan Head Operates