Heating Principle Of Ih Heater - Toshiba e-studio3511, e-studio4511 Manual

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.
High frequency
power source
November 2003 © TOSHIBA TEC
Main IH coil
B
A
Sub IH coil Magnetic field
[Image of Current Flowing form A to B]
Fig. 16-402
Smoothing circuit
C1
D1
T1
Current input
Monitoring input current
Monitoring input current
[Book Diagram of High Frequency Power Supply]
Fig. 16-403
16 - 5 e-STUDIO3511/4511 FUSER UNIT/PAPER EXIT SECTION
Current flowing on the surface of the fuser roller
Eddy current Current flowing inside the
fuser roller
Control circuit high frequency current
Fuser roller
IH coil
Tr1
IGBT
C2
drive
( IGBT )
C3
Tr2
IGBT
drive
CPU
Voltage
input
I/F circuit on LGC board
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