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No. 99MBC095A
b) Plate (Sheet)
In the case of the width measurement of a transparent plate with no chamfer on edges,
measurement may not be possible since acute-edge signals cannot be produced for such
edges.
Transparent Workpiece
Laser scan direction
Ideal edge signal
Binary voltage level (SHL)
Photo-electric signal
Measurement is aborted
because a sharp edge
can not be determined.
For measuring a transparent plate-shaped workpiece
Take the following precautions:
1. Incline the workpiece.
By inclining the workpiece it is possible to attain a sharp edge from the light con-
trast. In this case:
Measurement : W = W0 (workpiece dimension) x cos θ
W
0
W
θ
Workpiece
Direction of light is turned, and is not incidental to the photo-electric element.
2. Chamfering
Chamfer the workpiece edge by W. W will vary depending on the model. Always
use values larger than those in the table below.
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S005-MSLmm1.0
S105-MSLmm1.0
S305-MSLmm2.0
S605-MSLmm4.0
S215-MSLmm8.0
S615-MSLmm2.1
W
Workpiece
Direction of light is turned,
and is not incidental to the
photo-electric element.