7
MOUNTING SPECIFICATIONS
Enclosure Specifications
Output Window Properties
Please contact a Metrologic representative to coordinate the best
window material required to maintain laser safety requirements for
your application.
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.
Follow these guidelines when designing the output window.
• Acceptable window materials include; Acrylic (cast or molded), float glass,
CR-39, and Polycarbonate.
Molded polycarbonate is high in strength but might exhibit a
phenomenon called birefringence. Birefringence refers to multiple
indices of refraction within one material. This condition will induce
polarization effects that can be detrimental to scan performance of
the engine. Check with a Metrologic representative before utilizing
a transparent polycarbonate material for the output window.
• The exit window material should have a spectral transmission of at least
85% from 640 nm to 690 nm and should block shorter wavelengths.
• Red cell-cast acrylic is recommended.
• The exit window should exhibit a wavefront distortion (transmission) of no
more than 0.2 wavelengths peak-to-valley maximum over any 0.08"
diameter within the clear aperture.
• The clear aperture of the output window should extend beyond the 54°
beam sweep (see Exit Beam Specifications on page 4).
• It should have a 60-40 surface quality and be optically flat, clear, free of
scratches, pits, or seeds. If possible recess the window into the housing for
protection or apply a scratch resistance coating (see Output Window
Coatings on page 8).
• Apply an anti-reflective coating to the window surfaces to reduce the
possibility of reflective light interfering with the engine’s performance due to
the window angle (see Output Window Coatings on page 8).
(68 pages)
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