Installation 2 - 13
Embedded Window Angle and Position
If you are placing a window between the DS457 and the target, observe the following guidelines:
•
Window Clear Opening - Make the clear opening of the window large enough so that the entire imager
clear aperture passes through the window. Cutting off any part of the clear aperture can degrade decode
range performance. Ensure that window placement relative to the DS457 accounts for tolerances on all
parts involved in that assembly.
•
Window Angle - Minimum window tilt is indicated in Table 2-4 on page 2-15. Further tilting the window is
acceptable and decreases the possibility of a secondary reflection from that window degrading the
imager's performance.
•
Minimum Window Distance - 5 mm.
•
Optical Working Range - Adding a window can reduce the working range of the imager since there is a
signal loss when passing through window material. To minimize this reduction, use a special coating
described in Window Coatings on page 2-12. To understand the difference, test the imager in the desired
orientation and see if the difference affects imager performance.
Table 2-3
Window Manufacturers and Coaters
Company Discipline Specifics
Evaporated Coatings, Inc.
2365 Maryland Road
Willow Grove, PA 19090
(215) 659-3080
Anti-reflection coater Acrylic window supplier
Anti-reflection coater
Fosta-Tek Optics, Inc.
320 Hamilton Street
Leominster, MA 01453
(978) 534-6511
Cell-caster, hard coater, laser
cutter
CR39 exit window
manufacturer
Optical Polymers Int. (OPI)
110 West Main Street
Milford, CT 06460
(203) 882-9093
CR-39 cell-caster, coater,
laser cutter
CR39 exit window
manufacturer
Polycast
70 Carlisle Place
Stamford, CT 06902
(800) 243-9002
Acrylic cell-caster, hard coater,
laser cutter
Acrylic exit window
manufacturer
TSP
2009 Glen Parkway
Batavia, OH 45103
(800) 277-9778
Acrylic cell-caster, coater,
laser cutter
Acrylic exit window
manufacturer
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