Oki OKIFAX 5950 Series Maintenance Manual page 457

(3) Exposure
Light emitted by the LED head irradiates the image drum surface with a negative charge.
The surface potential of the irradiated portion of the image drum drops, forming an
electrostatic latent image associated with the image signal.
Charge roller
Power
supply
Image drum
The image drum is coated with an underlayer (UL), a carrier generation layer (CGL), and
carrier transfer layer (CTL) on aluminum base. The organic photo conductor layer (OPC),
comprising a CTL and a CGL, is about 20 mm thick.
OF5750/5950 Series January 2001
LED head
Paper
20 µm
30 mm
A3 - 29
R76-
LED head
Image drum
Image drum
CTL
CGL
UL
Base