Ih Fixing Method (Outline); Limiting Th Rise In Temperature At The Roller Edges By Use Of A Flux Blocking Plate (Shutter) - Canon iR5055 Series Service Manual

9.1.3 IH Fixing Method (outline)

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
The machine uses the IH fixing method.
[1] Fixing roller
[2] Excitation coil
[3] Core
[4] Pressure roller
Note:
The arrow in the figure shows the direction of paper movement.
INV_ON: fixing heater power ON signal
PWM_OUT: fixing heater power supply control signal
DCON: DC controller PCB
IH DRIVER: fixing heater driver PCB
MEMO:
The term IH stands for "induction heating."
When high-frequency current is supplied to a coil arranged inside a heater unit, a high-frequency magnetic field develops around the coil. The filed serves to permit
the flow of eddy current (induction current) to the fixing roller, causing the roller to heat on its own.
Characteristics:
The use of the IH method enables the fixing roller to warm up quickly, permitting a reduction in warm-up time (30 sec) as well as of power consumption.

9.1.4 Limiting th Rise in Temperature at the Roller Edges by Use of a Flux blocking Plate (shutter)

iR5065 / iR 5055 / iR5075 / iR5075N / iR5065N / iR5055N
When small-size paper is used, the temperature of the areas of the fixing roller surface with which the paper will not come into contact will increase (overheating
of the edges). To limit such a rise to a minimum, the machine is equipped with a flux blocking plate (shutter; made of non-magnetic material), and the fact helps
maintain a high level of productivity when small-size paper is used.
[1]
[3]
[4]
F-9-3
J2402
J1040
IH DRIVER
PWM_OUT
F-9-4
[2]
J130
INV_ON
DCON
Chapter 9
0015-4582
0015-4583
9-3