13
※
Note
: Use the parallel or tilted window to read the barcodes. The dust and scratches on the tilted window will result in
bad performance in the imaging system.
The window should be positioned properly to let the illumination beams pass through as much as possible and no
reflections back into the engine (reflections can degrade the reading performance).
The window should be mounted close to the front of the engine (parallel). The maximum distance is measured from the
front of the engine housing to the farthest surface of the window. Avoid unwanted reflections and use thin material for
window so as to reach better reading performance.The vertical distance between the farthest surface of the window and
the engine front surface should not exceed a + d, and that between the nearest surface of the window and the engine front
surface should not exceed a mm (a=1mm, d=2mm).
Figure 2-5
Table 2-2
Minimum Angle (Tilted Window)
Distance from Engine Front Surface (b)
(Unit: mm)
5mm
10mm
15mm
20mm
No coating, minimum window positive tilt (+w)
56
°
50
°
45
°
40
°
No coating, minimum window negative tilt (-w)
Anti-reflection coating with one side, minimum window positive tilt (+w)
50
°
45
°
40
°
35
°
Anti-reflection coating with one side, minimum window negative tilt (-w)
Anti-reflection coating with two sides, minimum window positive tilt (+w)
45
°
40
°
35
°
30
°
Anti-reflection coating with two sides, minimum window negative tilt (-w)
If the window is required to be in a tilted position, the distance requirements above should be met and tilt angle should
