173
6.1.3.
Printing Mechanism
The Printing Mechanism consists of the Laser Unit (LSU), OPC (Organic Photo Conductor) Drum, and
various other parts which ensure the normal feeding of recording paper. These components and their
functions are as follows:
Printing Process Operation
Charge
In the dark, the Bias Charge Roller (BCR) applies a high, uniform negative charge to the surface of the
OPC Drum. The surface potential is approximately -560 VDC and remains because the drum has a high
electric resistance in the dark.
Exposure
A portion of the laser beam is deflected to the timing sensor [Beam Detection (BD) Sensor], which
controls the start timing of scanning on the OPC Drum. The CPU also uses the timing sensor to detect
abnormal signals. The light beam from the laser diode is modulated by the digital signal (nVIDEO) and
converted to parallel light waves by the collimator lens. The beam is then directed to the rotating polygon
mirror, where it is reflected to the f-
θ
lens and then focused onto the OPC Drum surface. The laser beam
moves across the surface of the OPC Drum in the scanning direction. Where the laser beam is applied,
the negative charge on the drum dissipates, and where the laser is not applied, the negative charge
remains. This action forms a latent, electrostatic image on the OPC Drum, corresponding to the original
image.
Development
This development process uses a conventional method, where toner coats a Development Roller and
transfers to the latent image on the OPC Drum. In the Toner Cartridge, the (mono-component) toner is
Hopper
Agitator Sweeper
Mixing Blade
Developing Blade
Development Roller
Laser Beam
Auger
Bias Charge Roller
OPC Drum
Waste Toner
Drum Unit
Toner Cartridge
Toner
Содержание Panafax UF-4000
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Страница 22: ...22 For Other Destinations UF 490 UF 4100 UF 4100 ABBR ...
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Страница 280: ...280 4 3 2 1 D C B A 1 2 3 4 Drawing Name Power Supply Unit For USA Canada 2 2 Model UF 490 UF 4000 ...
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