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.
Summary of Contents for MS4980
Page 1: ...MS4980 Area Imaging Scanner Installation and User s Guide ...
Page 10: ...6 ...
Page 32: ...28 ...
Page 45: ...41 Patents For patent information please refer to www honeywellaidc com patents ...
Page 46: ...42 ...
Page 51: ......
