Theory of operation Ver. 1.0 Nov. 2007
18.1.1
Drive
18.2 Operation
18.2.1
Toner density detection control
• A reflective sensor is used for the IDC sensor that detects the amount of toner sticking to
the surface of the transfer belt. Image stabilization is performed based on the value
detected.
• The detection pattern (toner image) produced on the surface of the transfer belt is irradi-
ated with light emitted by the LED of the sensor.
• The photodiode of the sensor detects the light reflected off the toner pattern on the sur-
face of the transfer belt.
Transfer belt surface
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• A voltage corresponding to the intensity of the light reflected off the toner pattern is out-
put to the MFP board.
IDC sensor
Amount of toner
Intensity of light
sticking
Large
Small
18. Conveyance section (IDC sensor)
LED
Output
reflected
Small
Low
Great
High
A011T2C582AA
Photodiode
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