READING FEATURES
105
7
7 READING
FEATURES
7.1 OPTICAL ACCESSORY SELECTION
Referring to Figure 98, and the formula below, use the data in the following table to calculate
the FOV for your application.
Model Lens
Viewing Angle
Horizontal
Viewing Angle
Vertical
Viewing Angle
Diagonal
Min Focus Distance
d
(mm)
LNS-1216 16 mm
28.8° 24.5° 37.2°
40
LNS-1225 25 mm
19.8° 16.7° 25.7
50
LNS-1235 35 mm
13.4° 11.3° 17.5°
150
Matrix 450 800-030
LNS-1250 50 mm
9.2° 7.8°
12.1°
340
The viewing angle has a tolerance of
1° depending on the focus distance.
FOV
x
= 2 (d + 44 mm) tan (
x
/2)
where:
FOV
x
= horizontal, vertical or diagonal FOV
x
= horizontal, vertical or diagonal viewing angles.
d
= focus distance (from Lens Cover window surface to code surface)
FOV
plane
d
44 mm
Figure 98 – Reading Distance References
Example:
The FOV for a
Matrix 450 800-030 base
using the
16 mm lens
at a
focus distance of 1000
mm
is:
FOV
H
= 2 [(1000 mm + 44 mm) tan (28.8°/2)] =
536 mm
FOV
V
= 2 [(1000 mm + 44 mm) tan (24.5°/2)] =
453 mm
2
The minimum focus distance is used for applications that do not use the LT-03x lighting system.
Summary of Contents for Matrix 450
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