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e-STUDIO3511/4511 COPY PROCESS 3 - 6 November 2003 © TOSHIBA TEC
3
• About developer material
The developer material is comprised of a mixture
of toner and carrier. The toner is charged to a
negative polarity and the carrier to a positive
polarity, due to the friction with each other
caused by mixing.
Toner :Mainly consists of resin and coloring.
Carrier: Consists of ferrite, and over its surface
resin coating to provide consistent frictional
electrification.
N
S
S
[Toner]
Ferrite
[Carrier]
Note:
If the developer material is used for a long period
of time (beyond its normal life span), toner will
become caked onto the carrier.
The performance of the carrier is lowered.
Result: 1. Image density is lowered.
2. Toner scattering occurs.
3. Background fogging occurs.
Solution: Replace the developer material.
Toner
Carrier
Where toner is caked, no
frictional electrification
occurs.
• Magnetic roller
- Magnetic brush development technique -
Inside magnetic rollers, the south and north poles
are arranged as shown in the right figure. The
developer material forms a brush-like fluff which
contacts the photoconductive drum surface.
This is caused by the lines of magnetic force
between the south and north poles.
Lines of magnetic force
Magnetic roller
Photoconductive
drum
Fig. 3-309
Fig. 3-310
Fig. 3-311
→
→
Coloring agent
(5-10%)
5-13µm
Resin (90-95%)
30-100µm