6-4
Installation Conditions and Method
6
[3] Optimum lens and resolution
The optimum lens for your system can be selected, based on the camera installation distance and the
field of view (workpiece size).
Lens
Lens holder
Close-up shot ring
Workpieces
Workpieces
View (mm)
Rounded surface of camera body
Camera installation
distance (mm)
(Horizontal
direction
)
Vertical direction
Vertical direction
Horizontal direction
1
3
2
Lens focal length f=16mm
Camera
installa-
tion
distance
View
(mm)
Hori-
zontal
Vertical
Focal
length
Reso-
lution
450
500
600
96.3
107.4
129.6
102.8
114.6
138.3
16.6
16.5
16.4
200.7
223.9
270.1
(mm)
(mm)
(µm)
There is a relationships as shown on page 6-6 and 6-7, among the camera installation distance, the
field of view (in the vertical/horizontal direction), the lens focal length f, the aperture setting, the focal
length, and the resolution.
[Example]
When the camera installation distance is 500 mm and the field of view (in the horizontal
direction) is 110 mm, the optimum lens can be selected as described in the following
procedure. The required information is taken from the table on page 6-6.
11
11
1 Selecting the lens focal length, and aperture (f - stp setting)
Follow the line for a camera installation distance of 500 mm for the view (in the horizontal
direction) that is closest to 110 mm, which is 114.6 mm. A 114.6 mm field of view is shown in
the column for a lens focal length, f, of 16 mm. Therefore, a lens with focal length of 16 mm is
considered to be optimum.
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