Principle Of The Sensor - Toshiba e-STUDIO281c Service Manual

15.2 Principle of the Sensor

Image quality sensor (S17) projects light onto the transfer belt and the toner image (test pattern) devel-
oped on the transfer belt to output a voltage corresponding to the reflected light amount.
The output voltage is then converted analog-to-digital into reflected light amount signal. The CPU cal-
culates the toner adhesion amount to control the image forming conditions.
Test pattern
(toner image)
Light emitting
element
Light source amount voltage
e-STUDIO281c/351c/451c IMAGE QUALITY CONTROL
Transfer belt
Light receiving
element
Reflected light
amount voltage
Fig.15-1
15 - 2
Reflected light
amount signal
A/D
CPU
D/A
Light source
amount signal
June 2005 © TOSHIBA TEC