Metrologic 19-07335, Installation Manual

Page: 12 / 32

8
M
OUNTING
S
PECIFICATIONS
Enclosure Specifications
Output Window Coatings
• Anti-Reflection
An anti-reflective coating can be applied to the inside and/or outside of the
window to reduce the possibility of internal beam reflections interfering with
the scan performance of the engine. If an anti-reflective coating is applied
it is recommended that it be on both sides of the window providing a 0.5%
maximum reflectivity on each side from 640 to 690 namometers at the
nominal window tilt angle. The coating must also meet the hardness
adherence requirements of MIL-M-13508.
•
Polysiloxane Coating
Applying a polysiloxane coating to the window surface can help protect the
window from surface scratches and abrasions that may interfere with the
scan performance of the engine. Recessing the window into the housing
can also provided added protection against surface damage such as
scratches and chips. If an anti-reflective coating is used, there is no need
to apply a polysiloxane coating.
Output Window Angle
An improperly placed window has the potential to seriously reduce the
scan engine’s performance. Careful consideration must be made
when designing the output window’s distance and angle placement
relative to the scan engine’s exit beam and chassis.
It is important that angle of the window not be perpendicular to the exit beam
of the scan engine. The angle of the window can cause the beam’s laser
light to reflect off the inside of the window back into the scan engine’s optics
ultimately degrading the engine’s performance.
Please refer to the figures on page 9 and page 10 for specifications on the
minimum allowable window angle required to avoid reflective beam
interference.