5. O
V
ERALL CO
N
FIGRATIO
N
Theory of Operation
V
er. 1.1 Apr. 2010
10
bizhub 164
COMPOSITION/
OPERA
TION
5.2
Image creation process
[1]
Photoelectric
conversion
• A CIS sensor is used to convert the image data represented by light
reflected off the original to a corresponding electric signal which, in turn, is
output to the IR image processing section.
[2]
IR Image
processing
• The analog electric signal is converted to an 8-bit digital image signal (A/D
conversion) which, in turn, goes through appropriate corrections before
being output to the PH image processing section.
[3]
PH Image
processing
• After going through corrections, the digital image signal is converted to a
corresponding electric signal (D/A conversion), with which the laser is turned
O
N
or OFF as necessary.
[4]
Drum
• Made up of an aluminum pipe coated with a photoconductive layer, on which
an electrostatic latent image is formed.
[5]
Drum charging
• A uniform negative DC charge is deposited across the entire surface of the
drum.
[6]
Laser exposure
• The laser beam strikes the surface of the drum, forming an electrostatic
latent image.
[7]
Developing
• Toner negatively charged in the developer mixing chamber is attracted onto
the electrostatic latent image changing it to a visible, developed image.
• A developing bias (
V
b) is applied to the developing roller to prevent toner
from being attracted onto those areas of the drum which correspond to the
background areas of the original.
[8]
Paper feed
• Paper is supplied from the paper feed tray.
[9]
Image transfer
• A DC positive charge is applied to the image transfer roller to transfer the vis-
ible image on the surface of the drum onto the paper.
[10] Paper separation
• The drum paper separator fingers remove paper from the surface of the
drum.
• The charge neutralizing plate neutralizes any charge left on the paper.
[11] Cleaning
• Residual toner on the surface of the drum is scraped off.
• The toner is then recycled back to the developing unit.
[12] Fusing
• The developed image is permanently fused to the paper by the combination
of heat and pressure applied by the fusing roller.
[13] Paper exit
• The paper is fed out onto the exit tray.
A0XXT2C502AA
[1] Photoelectric
conversion
[2] IR Image
processing
[3] PH Image
processing
[4] Drum
[5] Drum charging
[6] Laser exposure
[7] Developing
[8] Paper feed
[9] Image transfer
[10] Paper separation
[12]
Fusing
[13] Paper exit
