PROCESS CONTROL
17 January, 2003
6-14
Step 6: ID Sensor Highlight Pattern Generation
The machine makes a 5-grade pattern on the transfer belt for each toner color. The
pattern consists of 5 squares. Each of the squares is 12 mm x 15 mm, and is a dot-
pattern squares (not solid-color squares like in the process of step 2). They are
made using constant bias and charge roller voltages selected from one of the types
mentioned above, and the various grades are made sby changing the LD power.
Step 7: Sensor Pattern Density Detection
The ID sensor detects the densities of the 5 dot-pattern squares for each color.
This data goes to memory.
Step 8: V
L
(LD Power) Selection
The machine determines the relationship
between the amount of toner on the transfer
belt and the laser power for each of the 5
grades. The machine now selects the laser
power to get the target M/A.
After that, the transfer belt cleaning unit
cleans the transfer belt.
Left
Transfer belt
12 mm
15 mm
G080D905.WMF
Target
M/A
M/A
L
LD Power
G080D939.WMF