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The graphic below shows the geometry of the optical setup.
xx0900000550
A
B
C
C
D
E
f
H
W
To select a suitable lens, measure the distance between the camera and the items
(D), and the size of the image area (W*H).
To calculate the appropriate focal length of the lens:
xx0900000565
The table below lists the width and height of some common sensor chip sizes,
expressed in millimeters.
Sensor chip size (inch)
1/4"
1/3"
1/2"
2/3"
A shorter focal length gives a wider field of view, that is the returned value is the
maximum focal length to obtain the specified W and H.
Application manual - PickMaster® Twin - PowerPac
3HAC064218-001 Revision: B
Sensor chip
Lens
Chip height (mm)
Chip width (mm)
Distance from lens to scene (mm)
Scene
Focal length of camera (mm)
Scene height (mm)
Scene width (mm)
•
If the height of the image area is most important: f = (D/W)*Cw
•
If the length of the image area is most important: f = (D/H)*Ch
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2.2.4 Camera requirements
C
(mm)
C
h
2.4
3.2
3.6
4.8
4.8
6.4
6.6
8.8
Continues on next page
2 Installation
Continued
(mm)
w
23
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Table of Contents
Troubleshooting
