Oki OKIPAGE 10ex Maintenance Manual page 30

(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.
Power
supply
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 CTL and CGL, is about 20 µm thick.
LED head
Charge roller
Image drum
2 - 15
LED head
Paper
Image drum
Image drum
CTL
CGL
UL
Base
20µm
30mm