2GL/2FV/2FW
2-1-7
2-1-4 Developing section
(1) Developer unit
The latent image constituted on the drum is developed into a visible image. The developing roller contains a 3-pole (S-N-
S) magnet core and an aluminum cylinder rotating around the magnet core. Toner attracts to the developing roller since it
is powdery ink made of black resin bound to iron particles. Doctor blade, magnetized by magnet, is positioned approxi-
mately 0.30 mm above the developing roller to constitute a smooth layer of toner in accordance with the roller revolution.
The developing roller is applied with the AC-weighted, positive DC power source. Toner on the developing roller is given a
positive charge. The positively charged toner is then attracted to the areas of the drum which was exposed to the laser
light. (The gap between the drum and the developing roller is 0.32 mm.) The non-exposed areas of the drum repel the
positively charged toner as these areas maintain the positive charge.
The developing roller is also AC-biased to ensure contrast in yielding by compensating the toner’s attraction and repelling
action during development.
Figure 2-1-8 Developer unit and toner container
S2
0.30 mm
0.32 mm
N
S
Drum
250
93
N1
S1
(1) DLP case
(2) Magnet roller
(3) Developing sleeve
(4) DLP screw A
(5) DLP screw B
(6) Doctor blade
(7) DLP shutter
(8) Toner container
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