November 2003 © TOSHIBA TEC 13 - 5 e-STUDIO350/450 FUSER UNIT / PAPER EXIT SECTION
13
13.4.2 Heating principle of IH Heater
The magnetic field is generated by applying a high frequency current to the IH coil inside the fuser roller,
which then generates the eddy current in it. When the eddy current flows, the Joule heat is generated by
the resistance element of the fuser roller, which is then heated. In the IH coil method, the thermal effi-
ciency is higher than the lamp method because the fuser roller is directly heated.
B
A
Current flowing on the surface of the fuser roller
Current flowing inside the
fuser roller
Eddy currentHigh frequency
magnetic field
IH coil
High frequency
power source
[
Image of current flowing from A to B
]
D1
T1
C1
C2
CPU
Voltage
input
I/F circuit on LGC board
Monitoring input current
Current input
Monitoring input current
Control circuit high frequency current
Smoothing circuit
Tr 1
(
IGBT
)
IH coil
Fuser roller
IGBT
drive
[
Block diagram of high frequency power supply
]
Photocoupler
Fig. 13-402
Fig. 13-403
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