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2 - 14 SE4750 Integration Guide
Recommended Exit Window Information
Window Distances
Figure 2-9
Recommended Exit Window Information - Tilted Window
Table 2-4
Distance from Engine Front Surface (b) in mm
Window Specification
Non-coated, minimum window positive tilt (+c)
Non-coated, minimum window negative tilt (-c)
AR coated, one side, minimum window positive tilt (+c)
AR coated, one side, minimum window negative tilt (-c)
AR coated, two sides, minimum window positive tilt (+c)
AR coated, two sides, minimum window negative tilt (-c)
Exit Window Notes
•
Do not place the exit window between the maximum distance for a parallel window ("a" in
minimum distance for a tilted window (5 mm in
•
Integration tolerances are not included.
•
Ensure the window size is large enough to cover the engine clear aperture specified in
mounting tolerances of the window relative to the engine.
•
Using a tilted window is not recommended for intelligent document capture (IDC) applications because dust
particles on the window surface scatter bright LED illumination and create image blemishes. The blemishes
are not harmful for bar code reading but degrade quality of IDC. For comparison, parallel windows are
located close enough to the engine that dust particles do not create image blemishes.
Maximum Distance "a" for a Parallel
Window (all dimensions in mm)
Uncoated window:
Single side coated window
(coated side toward engine):
Double side coated window:
where:
a is the window distance from engine front
n is the index of refraction of the window material
(typically 1.5 to 1.6)
t is the window thickness
(typically 0.7 mm to 1.5 mm)
Anti-reflection coating specification:
Surface reflectance (avg) < 0.5% for
420 - 730 nm at 0 - 60
5
5.8
10
o
o
+40
+40
+38
N/A
N/A
o
-52
o
o
+40
+40
+35
N/A
N/A
o
-27
o
o
+37
+36
+33
o
o
o
-18
-22
-25
Table
2-4) in respect to the front of the engine.
a < = 1.69 - (t/n)
a < = 1.94 - (t/n)
a < = 3.14 - (t/n)
o
angle of incidence
12
15
20
Angle
o
o
o
o
+37
+35
+35
o
o
o
-52
-27
-27
o
o
o
o
+35
+35
+33
o
o
o
-27
-27
-27
o
o
o
o
+32
+31
+29
o
o
o
-25
-25
-25
Figure
2-9) and the
Figure 2-8
25
o
+35
o
-27
o
+32
o
-27
o
+28
o
-25
plus
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