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4-10
FS-1010
(3) Development
The latent image constituted on the drum is developed into a visible image. The developing roller
A contains a 3-pole (S-N-S) magnet core B and an aluminum cylinder rotating around the magnet
core B. Toner attracts to the developing roller A since it is powdery ink made of black resin bound
to iron particles. Doctor blade C, magnetized by magnet D, is positioned approximately 0.3 mm
above the developing roller A to constitute a smooth layer of toner in accordance with the roller
revolution.
Figure 4-1-8 Development
The developing roller A is applied with the AC-weighted, positive DC power source. Toner E on
the developing roller A is given a positive charge. The positively charged toner E is then attracted
to the areas of the drum F which was exposed to the laser light. (The gap between the drum F and
the developing roller A is approximately 0.3 mm.) The non-exposed areas of the drum F repel the
positively charged toner as these areas maintain the positive charge.
The developing roller A is also AC-biased to ensure contrast in yielding by compensating the
toner’s attraction and repelling action during development.
C
E
D
F
HVCLK
Bias
board
YC-B
A
B
Engine board
YC11-5YC302-8
N
S
N
S
S
0.3 - 0.4 mm
0.1 mm
Magnetism
Developing
bias output
275±5 V DC
+ AC