Toshiba e-studio281c - Principle of the Sensor

e-STUDIO281c/351c/451c © 2005 - 2008 TOSHIBA TEC CORPORATION All rights reserved
IMAGE QUALITY CONTROL
15 - 2
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.
Fig. 15-1
CPU
A/D
D/A
Transfer belt
Test pattern
(toner image)
Light emitting
element
Light receiving
element
Reflected light
amount voltage
Reflected light
amount signal
Light source
amount signal
Light source amount voltage