e-STUDIO281c/351c/451c © 2005 - 2008 TOSHIBA TEC CORPORATION All rights reserved
COPY PROCESS
3 - 8
- 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.
Fig. 3-13
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.
Fig. 3-14
Resin
(
90-95%
)
[
Toner
]
5-13 µm
Ferrite
Carbon
(
5-10%
)
30-100 µm
[
Carrier
]
Where toner is caked, no
frictional electrification
occurs.
Toner
Carrier
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