Toshiba DP120F Service Manual page 277

3.3.3 Image Formation
A laser beam scans horizontally by the Polygon mirror driven by the Polygon motor.
The Polygon mirror has six surfaces and the laser beam scans 6 lines on the drum when the
Polygon mirror completes one rotation.
Polygon mirror
The figure below shows the print image when the laser beam controlled by the laser diode drive
signal from the Main PBA scans 1 line on the drum not being rotated. With this facsimile, toner
is attracted to the area where the laser beam strikes the drum.
March 2000 © TOSHIBA TEC
Fθ lens
Fig. 5-3-12
PRINTING IMAGE
LD
Fig. 5-3-13
Black level White level
(Laser is ON) (Laser is OFF)
5-17 DP120F/DP125F Mechanical Description
Drum
05-03-12
05-03-13