Electronic Pattern
Halftone
Black
Copy density
sensor
Halftone
sensor
Sensor
Output
1.25
0.35
0
1-28
Laser Unit
Grid Voltage
Drum
Black sensor
Halftone
Black
Control point
High Density
Middle Density
Density data from printer
Laser Power
Digital
QUANTUM
(QUARC)
Control
Ideal Curve
255