Theory of Operation Ver. 8.0 Jun. 2008
5. Image creation process
1
5
Outline
5.
Image creation process
[1]
Photoelectric
conversion
• The light reflected off the surface of the original is separated into dif-
ferent colors using the color filters (R, G, and B); CCD then converts
it into a corresponding electric signal and outputs the signal to the IR
imaging processing section.
[2]
IR image processing
• The electric signal is converted to 8-bit digital image signals. After
going through some corrections, video signals (C, M, Y, and K) are
output to the printer image processing section.
[3]
Printer image
processing
• D/A conversion will be performed after the VIDEO signals (Y, M, C,
Bk) are corrected. This data will control the emission of the laser
diode.
[4]
PC drum
• The image of the original projected onto the surface of the PC drum is
changed to a corresponding electrostatic latent image.
[5]
PC drum charging
• Supply DC ( - ) charge on the PC drum.
[6]
Laser exposure
• Expose photo conductor to a laser beam to develop electrostatic
latent image.
[7]
Developing
• The toner, agitated and negatively charged in the developer mixing
chamber, is attracted onto the electrostatic latent image formed on
the surface of the PC drum. It is thereby changed to a visible, devel-
oped image.
• AC and DC negative bias voltages are applied to the developing
roller, thereby preventing toner from sticking to the background image
portion.
[8]
1st image transfer
• A DC positive voltage is applied to the backside of the transfer belt,
thereby allowing the visible, developed image on the surface of each
of the PC drums (Y, M, C, and K) to be transferred onto the transfer
belt.
A00JT1C203AA
[4] PC drum
[1] Photoelectric
conversion
[2] IR image pro-
cessing
[3] Printer image
processing
[7] Developing
[12] PC drum cleaning
Y
M
C
K
Y
M
C
K
[13] Main erase
[5] PC drum
charging
[5] PC drum
charging (K)
[9] 2nd image
transfer
[4] PC drum (K)
[11] Transfer belt cleaning
[8] 1st image transfer
[10] Paper
separation
[6] Laser exposure
Y107522-3 Theory of Operation
