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November 2003 © TOSHIBA TEC 15 - 3 e-STUDIO3511/4511 IMAGE QUALITY CONTROL
15
15.4 Construction
· Image quality sensor: Projects the amount of light on the transfer belt and outputs the voltage
corresponding to the reflected light amount from the transfer belt or the
toner image on the transfer belt.
· D/A converter: Converts light source amount signal into the voltage to the sensor.
· Laser optical system: Performs test pattern exposure (for toner image formation).
· A/D converter: Converts the output voltage from the sensor into digital values and outputs
them to the CPU.
· Image forming process: Performs charging, laser exposing and developing processes.
· CPU: Performs steps [1] to [10] described previously.
A/D
D/A
CPU
Image forming process
Transfer belt
Reflected light
amount signal
Light source
amount signal
Various image forming
conditions
Image quality
sensor
Laser optical system
Fig. 15-401