10
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DRUM/CLEANER UNIT
10 - 5
10.4.3
Principle of Image Quality Sensor
The image quality sensor applies the light to the drum and test pattern (toner image) developed on the
drum and outputs the voltage corresponding to its reflected light amount.
Toner amount on the drum is calculated from the reflected light amount obtained by this sensor.
Fig. 10-4
10.4.4
Flow of control
Test pattern
(Toner image)
Light emitting element
Light sensing element
Image quality sensor
Drum
Light source intensity signal
Reflected light intensity signal
Start controlling (e.g. during the pre-running after the power has been turned ON)
[6] Changing of the image formation condition
YES
NO
[1] Setting of the reference image formation condition
[2] Adjustment of the sensor
[3] Formation of the test pattern
[4] Reading of the value for the image quality sensor
[5] Determination
(Is the toner amount of the test pattern within the permissible amount?)
[7] Finish controlling
(Reflecting the determined image formation condition to the following printing)
Back to [3]