Image Creation Process - Konica Minolta bizhub C250 Service Manual

5. Image creation process

5. Image creation process
[1] Photoelectric
conversion
[2] IR Image
processing
[3] Printer Image
processing
[4] PC drum
[5] PC drum
charging
[6] Laser exposure
Photoelectric
[1]
conversion
IR image
[2]
processing
Printer image
[3]
processing
[4] PC drum
[5] PC drum charging
[6] Laser exposure
[7] Developing
[8] 1st image transfer
12
[11] Transfer belt cleaning
[8] 1st image transfer
• The light reflected off the surface of the original is separated into different
colors using the color filters (R, G, and B); CCD then converts it into a cor-
responding electric signal and outputs the signal to the IR imaging pro-
cessing section.
• 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.
• 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.
• The image of the original projected onto the surface of the PC drum is
changed to a corresponding electrostatic latent image.
• Supply DC ( - ) charge on the PC drum.
• Expose photo conductor to a laser beam to develop electrostatic latent
image.
• The toner, agitated and negatively charged in the developer mixing cham-
ber, is attracted onto the electrostatic latent image formed on the surface of
the PC drum. It is thereby changed to a visible, developed image.
• AC and DC negative bias voltages are applied to the developing roller,
thereby preventing toner from sticking to the background image portion.
• 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.
Theory of operation ver. 3.0 Aug. 2006
[12] PC Drum cleaning
[7] Developing
[10] Paper
separation
[9] 2nd image
transfer
[13] Main erase
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