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TONER SUPPLY CONTROL
24 February, 1999
2.2.3 V
DETECTION FOR TONER SUPPLY CONTROL
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The copier generates an ID sensor pattern using a
2 0 m m
standard laser diode power. The copier generates this
pattern between the K, C, M, and Y images, and then
detects the density using the ID sensor. The result is
2 0 m m
known as 'V
for toner supply control', or 'V
(toner)'
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to distinguish it from the other V
, measured during
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potential control.
A259A015.WMF
This process is done after
• Each color development cycle for odd-numbered copies when making
continuous copies of A4/LT landscape size or smaller.
• Each color development cycle, every copy in all other modes.
2.2.4 CALCULATING THE AMOUNT OF TONER ON THE DRUM
A259D552.WMF
A259A009.WMF
K toner
Y, M, C toner
First, the machine calculates a value from the current V
(toner) value. Then, it
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refers to a table in the ROM to determine the toner density on the drum (M/A).
• M/A: Toner amount per unit area on the drum (mg/cm
2
)
The target M/A for toner supply control is 0.4 mg/cm
for the C, M, and Y toners
2
2
and 0.3 mg/cm
for the K toner. M/A is calculated in the same way as for potential
control.
Fuzzy Logic Algorithm
The fuzzy logic algorithm has two input factors which are related to the amount of
toner on the drum. These are:
• The difference between the average of the previous 10 M/As and the target M/A
• The tendency of the previous 10 M/As
2-14
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