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WRITE CF5001 Ver.1.0 Sep. 2003
2-14
II UNIT EXPLANATION
A. Types of the color registration correction control
There are following 5 color registration correction controls.
The write units are mechanically adjusted in the "Partial horizontal magnification"; however, the correction
is performed automatically in the other four.
*1 The relationship between 2 colors are shown in the interests of simplicity.
*2 In "drift in the main scan direction", "Entire horizontal magnification", and "Partial horizontal magnifica-
tion", colors are intentionally drifted in the sub-scan direction to make it clear the drift between 2 colors.
B. Overview of the color registration automatic correction control
In the color registration automatic correction control, the color registration marks for each color are trans-
ferred on the transfer belt in the different transfer area. The locations are detected by the color registration
sensor /F (PS8) and the color registration sensor /R (PS9). This information is used to determine the
image drift amount for each color.
If the amount for a color is beyond the set point, adjust the image write timing, the clock frequency, and the
angle of the cylindrical lens 2 for the corresponding color are adjusted as necessary.
Correction type Correction method
Drift in the main
scan direction
Adjusts the write start timing in the main scan direction
Drift in the sub-
scan direction
Adjusts the write start timing in the sub-scan direction
Entire horizon-
tal magnification
Adjusts the clock frequency at write
Inclination Adjusts the angle of the cylindrical lens 2
Partial horizon-
tal magnification
Adjusts the position of the write unit (parallelism
against drum)
*See adjusting the timing for the image adjustment in
36 mode