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Housing Design; Optical; Positioning The Exit Window; Avoiding Scratched Windows - Motorola Symbol SE4400 Integration Manual

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SE4400 Integration Guide

Housing Design

Note: Opto-mechanical analysis is recommended for housing design to
ensure optimal scanning or imaging performance.
Design the housing so that internal reflections from the illumination system are not directed
back toward the engine. The reflections from the window can cause problems, and for
particular window tilt angles, these reflections can bounce off the top or bottom of the
housing and reach the engine.
The Exit Window Information
(Table 2-4 on page
2-9) provides minimum exit window
dimensions and tilt angles. These dimensional requirements can vary. Consider using
baffles or matte-finished dark internal housing colors.

Optical

The SE4400 uses a sophisticated optical system that provides imaging performance that
matches or exceeds the performance of much larger imagers. However, the performance
of the SE4400 can be affected by an improperly designed enclosure, or improper selection
of window material.

Positioning the Exit Window

Position the window so that illumination system light reflected off the inside of the window
is not reflected back into the engine (see
Table 2-4 on page
2-9). The specified angles are
minimums; allow for manufacturing tolerances. If the designed enclosure cannot
accommodate the recommended window angle, contact Symbol Technologies to discuss
positioning requirements. An improperly positioned window can significantly decrease
performance.

Avoiding Scratched Windows

Scratches on the window can greatly reduce the performance of the imaging system. We
recommend recessing the window into the housing or applying a scratch resistance
coating.

Window Material

Many window materials that look clear can contain stresses and distortions that reduce
performance. For this reason, only cell-cast plastics or optical glass is recommended (with
2-4

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