Location And Positioning; Embedded Applications Requiring A Window; Window Material - Motorola Symbol MS4404 Integration Manual

Location and Positioning

The location and positioning guidelines do not consider unique application characteristics. Motorola recommends
that an opto-mechanical engineer perform an opto-mechanical analysis prior to integration.
NOTE Integrate the imager in an environment no more extreme than the product's specification, where the
imager will not exceed its temperature range. For instance, do not mount the imager onto or next to a large
heat source. When placing the imager with another device, ensure there is proper convection or venting
for heat. Follow these suggestions to ensure product longevity, warranty, and overall satisfaction with the
imager.

Embedded Applications Requiring a Window

Use the following guidelines for applications that require a window in front of the MiniScan.
NOTE Motorola does not recommend placing an exit window in front of the MiniScan; however, the following
information is provided for applications that require such a window.

Window Material

NOTE Consider the following window placement and material recommendations if mounting the Symbol MS440X
within a product with its own window.
Many window materials that look perfectly clear can contain stresses and distortions that can reduce imager
performance. For this reason, Motorola highly recommends optical glass or cell-cast acrylic with an
anti-reflection coating. Following is a description of acrylic and CR-39, another popular window material.
2-1 outlines the suggested window properties.
CAUTION
NOTE Do not use polycarbonate material.
Acrylic
When fabricated by cell-casting, acrylic has very good optical quality and low initial cost. However, protect the
surface from the environment as acrylic is susceptible to attack by chemicals, mechanical stresses, and UV light.
Acrylic has reasonably good impact resistance and can be ultrasonically welded.
CR-39
CR-39 is a thermal-setting plastic produced by the cell-casting process, and is commonly used in plastic eye glasses
lenses. CR-39 has excellent chemical and environmental resistance, including good surface hardness. Typically it
does not require hard-coating, but can be hard coated for severe environments. CR-39 has reasonably good impact
resistance and cannot be ultrasonically welded.
Consult an opto-mechanical engineer to recommend an appropriate window material and to
determine if coatings are appropriate for the specific application.
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