Motorola Symbol MiniScan MSXX07 Series Integration Manual page 35

Suggested Window Properties
Table 2-2
Property
Material
Spectral Transmission
Thickness
Wavefront Distortion (transmission)
Clear Aperture
Surface Quality
Coating
Window Coatings
Table 2-3 on page 2-14 lists some exit window manufacturers and anti-reflection coaters.
Anti-Reflection Coatings
Apply an anti-reflection coating to the inside and/or outside of the window to significantly reduce the amount of light
reflected off the window, back into the scan engine. The coating can also improve the range of acceptable window
positions and minimize performance degradation due to signal loss as the light passes through the window. Using
anti-reflection coatings on both the inside and outside of the window is highly recommended.
Polysiloxane Coating
Polysiloxane type coatings are applied to plastic surfaces to improve the surface resistance to both scratch and
abrasion. They are usually applied by dipping, then air-drying in an oven with filtered hot air.
Red cell-cast acrylic.
85% minimum from 640 to 690 nanometers.
0.059 ± 0.005
0.2 wavelengths peak-to-valley maximum over any 0.08 in. diameter
within the clear aperture.
To extend to within 0.04 in. of the edges all around.
60-20 scratch/dig
Both sides to be anti-reflection coated to provide 0.5% max reflectivity
(each side) from 640 to 690 nanometers at nominal window tilt angle.
Coatings must comply with the hardness adherence requirements of
MIL-M-13508.
Installation 2 - 13
Description