8
Top View (Unit: mm)
Figure 2-5
Optics
Window Placement
The window should be positioned properly to let the illumination beam pass through as much as possible and no reflections
back into the engine (reflections can degrade the reading performance of the engine).
The window should be mounted as close to the front of the engine (parallel) as possible. The maximum distance is
measured from the front of the engine housing to the furthest surface of the window. In order to reach better reading
performance, the distance from the front of the engine housing to the nearest surface of the window should not exceed
a
(a=0.5mm) and the distance from the front of the engine housing to the furthest surface of the window should not exceed
a+d
(a=0.5mm, d=2mm), as shown in
Figure 2-6
.
Figure 2-6
