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Image Stabilization Control Main Unit Theory of Operation
2-118
II Composition/Operation
17. Image Stabilization Control
• To ensure that a stabilized output image is produced at all times, a comprehensive con-
trol is provided for the developing bias voltage, laser light intensity, registration correction,
gamma correction, and other parameters.
17.1 Overview of image stabilization control
• Image stabilization control may be divided into two types: complete and full correction
control. The following explain specific details of each type of control.
17.1.1 Complete correction control
• Controls 1 through 6 below are collectively called the “complete correction control.”
• For details of each of these controls, see the relevant page.
Control name Purpose
1
AIDC Sensor calibra-
tion control
☞ 2-65
Changes in various types of characteristics due to change with time of
the AIDC Sensor (deteriorated LED, dirty sensor surface), part-to-part
variations in the sensors, and change of environment affect the AIDC
Sensor output corresponding to the clear Transfer Belt surface. To cor-
rect fluctuations in the output, the sensor LED intensity is adjusted so as
to keep constant the AIDC Sensor output value.
2
Developing bias Vpp
control
☞ 2-33
If the developing bias voltage (Vpp) is too high for the Ds distance in
each Toner Cartridge, a leak image (background leak, image area leak)
results. If Vpp is excessively low, halftone reproducibility becomes poor.
This control detects a Vpp range, in which no image failure occurs, to set
the optimum Vpp.
3
Developing bias duty
control (control of the
maximum amount of
toner sticking to the
Transfer Belt)
☞ 2-34
To correct the target amount of toner sticking to the Transfer Belt to form
the solid image.
4
Laser light intensity con-
trol
☞ 2-6
To correct the target level of fluctuations in fine line reproduction and
reverse image (white on black) reproduction that occur due to variations
in photo conductor electrostatic characteristics, developing characteris-
tics, and transfer characteristics (part-to-part variations, environment,
durability).
5
Gamma characteristics
detection control
☞ 2-35
To correct the tone by using the AIDC Sensor to measure the density of
a gradation pattern produced on the Transfer Belt and sending the
results of the measurement to the controller.
6
Registration correction
control
☞ 2-6
To correct incorrect color registration that occurs due to variations in
parts of the machine used for regulating different drawing positions.
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