Metrologic IS4815 Installation Guide download pdf (Page 12)

MOUNTING SPECIFICATIONS

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.

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Metrologic IS4815 Installation Guide Page 12