PROCESS CONTROL 17 January, 2003
6-12
Step 2: ID Sensor Solid Pattern Generation
The machine agitates the developer for between 15 and 60 seconds until the
fluctuation in TD sensor output becomes less than 0.3V, and then makes a 5-grade
pattern on the transfer belt for each toner color. The pattern consists of 5 squares
(the sequence is as follows: 5 black squares, 5 yellow squares, 5 cyan squares,
and 5 magenta squares). Each of the squares is 12 mm x 15 mm, and is a solid-
color square. They are made by changing the development bias and charge roller
voltage. The difference between development bias and charge roller voltage is
always the same.
Step 3: Sensor Pattern Detection
The ID sensor detects the densities of the 5 solid-color squares for each color. This
data goes to memory.
Step 4: Toner Amount Calculation
The amount of toner on the transfer belt (M/A, mass per unit area, mg/cm
2
) is
calculated for each of the 5 grades of the sensor pattern from the ID sensor output
value from each grade of the pattern.
Left
Transfer belt
12 mm
15 mm
G080D905.WMF
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