3-8
Setting the Threshold (Teach Function)
Example) Received light amount and threshold of a diffuse reflective fiber unit
When the light hits an object, light is reflected, increasing the received light amount. This level
exceeding the threshold is judged to indicate the presence of an object.
* If the background is a bright color and the object is a dark color, the increasing and decreasing of the
received light amount may occur in the opposite manner as described here.
The received light amount is high and light is
determined to be received when an object is present.
Light is not received or the received light
amount is low when no object is present.
The received light
amount exceeding the
threshold is judged to
indicate the presence
of an object.
High
Threshold
Low
Received light amount
No object presentObject presentNo object present
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