Honeywell MS4980 Scanner User Manual


 
12
Mounting General Guidelines
Avoid specular reflections, caused by ambient and internal light
sources.
The bar code should be slightly off perpendicular to the axis of the
scanner.
To reduce specular reflections the skew angle can vary significantly
depending on the application such as: ambient illumination sources,
code size and code type.
Excessive angles should be avoided.
Other factors, such as surface qualities, mounting distances, secondary
windows and external illumination can easily impact these
recommendations.
If a secondary window is used, the window should be mounted as close
to the front of scanner as possible at a 90° angle to the optical axis to
avoid specular reflections.
For secondary windows, Honeywell recommends the following:
o Optical quality glass
o >95% transmission in the nominal 650nm wavelength
o Anti-reflective coating on both sides
A skew angle of 15° to 20° between the normal of the bar code’s
surface and the optical axis of the imager is sufficient to avoid specular
reflections.
Avoid pitch angles above 15° to 20° to prevent code compression.
Figure 11.