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November 2003 © TOSHIBA TEC 16 - 5 e-STUDIO3511/4511 FUSER UNIT/PAPER EXIT SECTION
16
16.4.2 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 efficiency
is higher than the lamp method because the fuser roller is directly heated.
IH coil is divided into two parts to decrease the temperature difference between the center and both ends
of the fuser roller.
B
A
Main IH coil
Current flowing on the surface of the fuser roller
Current flowing inside the
fuser roller
Eddy currentMagnetic fieldSub IH coil
High frequency
power source
D1
T1
C1
C3
CPU
Voltage
input
I/F circuit on LGC board
Monitoring input current
Current input
Monitoring input current
Control circuit high frequency current
Smoothing circuit
Tr2
(
IGBT
)
C2
Tr1
IH coil
Fuser roller
IGBT
drive
IGBT
drive
Photocoupler
[Image of Current Flowing form A to B]
Fig. 16-402
[Book Diagram of High Frequency Power Supply]
Fig. 16-403