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Window Placement
The window should be positioned properly to let the illumination and aiming beams pass through as much as possible and
no reflections back into the engine (reflections can degrade the reading performance of the engine).
There are two window placement options.
• Parallel window – Primary option for imager engines. The following window distance requirements should be satisfied:
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=1mm) and the distance from the front of the engine housing to the furthest surface of the window
should not exceed a+d (a=1mm, d=2mm), as shown in Figure 2-8.
• Tilted window - This option is for laser/imager engines. For the tilted window distance requirements, please see Table
2-3.
Table 2-3
Minimum Angle (Tilted Window)
Uncoated, minimum window positive tilt (+w)
Uncoated, minimum window negative tilt (-w)
Anti-reflection coated, single side, minimum window positive tilt (+w)
Anti-reflection coated, single side, minimum window negative tilt (-w)
Anti-reflection coated, double sides, minimum window positive tilt (+w)
Anti-reflection coated, double sides, minimum window negative tilt (-w)
13
Figure 2-8
Distance from the front of the engine housing (b)
5mm
22°
20°
16°
10mm
15mm
20°
18°
18°
16°
16°
16°
20mm
18°
16°
16°
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