239
UF-5500 / 4500
13.2. Printing Operation Principle
13.2.1. Process Chart and Process BIAS
13.2.2. CHARGING
Charging is the stage that keeps the surface of the sensitive drum a fixed electric potential. The sensitive drum is the Organic Photo
Conductor (OPC), which is a electric conductive cylinder whose surface is covered with the Charge Generation Transfer Layer
(CGTL).
When the charging bias (DC +4.35kv) is added and the plus charge is supplied to the OPC surface while charging, the whole sur-
face potential of the drum is +475V.
Charging Part
Pressure Roller
Heat Roller
Transfer Roller
Developing Roller
OPC Drum
108.96mm/sec
Paper Path
Toner Supply Roller
Mirror
LSU
Developing Blade
LASER Path
Exit Roller
Developing Bias DC 170~240V & AC330V P.P.
(depends on the ambience and the lifetime)
AC 120V
Charging Bias
+200
µ
A
Constant current
(4.1~4.6kV)
Transcription Bias -4 to -25
µ
A (-500 ~ -4200V)constant
current (depends on the printing ratio)
Halogen
lamp
Grid plate
Charge
Wire
+475V
Cover
Glass
Charge Generation Transfer
Layer (CGTL)
+
Surface Pot475V
OPC
Drum
Electric Conductive
Cylinder (aluminum)
+
+
+
+
+
+
+
Grid Bias
DC +475V
Charging Bias
+200
µ
A
Constant current
4.1~4.6kV
Summary of Contents for UF-4500
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