Newland NLS-EM2037 V4, Руководство по интеграции

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11
Housing Design
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Note: Conduct an optical analysis for the housing design to ensure optimal scanning and imaging performance.
Housing design should make sure that internal reflections from the aiming and illumination system are not directed back to
the engine. The reflections from the housing or window can cause problems. For particular window tilt angles, the
unwanted reflections can bounce off the top or bottom and reach the engine. Avoid any highly reflective objects around the
engine that can cause bright spots to appear in the captured image. It is recommended to use baffles or matte-finished dark
internal housing colors.
Optics
The EM2037 uses a sophisticated optical system. An improperly designed internal housing or improper selection of window
material can degrade the
engine’s performance.
Window Placement
The window should be positioned properly to let the illumination and aiming beams pass through as much as possible and
no reflections back into the engine (reflections can degrade the reading performance of the engine).
There are two window placement options.
•
Parallel window
– Primary option for imager engines. The following window distance requirements should be satisfied:
The maximum distance is measured from the front of the engine housing to the furthest surface of the window. In order to
reach better reading performance, the distance from the front of the engine housing to the nearest surface of the window
should not exceed a (a=1mm) and the distance from the front of the engine housing to the furthest surface of the window
should not exceed a+d (a=1mm, d=2mm), as shown in Figure 2-12 .
•
Tilted window - This option is for laser/imager engines. For the tilted window distance requirements, please see Table
2-2 .
Figure 2-12