PRODUCT REFERENCE GUIDE 38
CHAPTER 6
READING FEATURES
FOV CALCULATION
Use the data in the following table to calculate the FOV for your application, referring to
Figure 19 and the formula below.
The viewing angle has a tolerance of ± 1° depending on the reading distance.
FOVx = 2 [ (d + d0)
*
tan (α
x
/2) ]
where:
FOV
x
= horizontal, vertical or diagonal FOV
x
= horizontal, vertical or diagonal viewing angles.
d = reading distance (in mm) from window surface to code surface
d
0
= offset (in mm) from center of lens to external window surface
Figure 19 - Reading Distance References
Example
The FOV at a reading distance of 100 mm is:
FOV
H
= 2 [(100 mm + 11 mm) * tan (19°/2)] 37 mm
FOV
V
= 2 [(100 mm + 11 mm) * tan (14.5°/2)] 28 mm
d
0
View Angle
Horizontal
View Angle
Vertical
View Angle
Diagonal
Min Reading
Distance
11 mm 19° 14.5° 24° 50 mm
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