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(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.
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.
Image drum
Paper
Image drum
LED head
LED head
Charge roller
30 mm
20 µm
Image drum
CTL
CGL
UL
Base
Power
supply