13.4.2Heating 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 gen- erated 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.

Current flowng on the surface of the fuser roller

B

Hgh frequency power source

A

IH col

Hgh frequency Eddy current

Current flowng nsde the

 

magnetc feld

fuser roller

[Image of current flowng from A to B]

Fig. 13-402

Control crcut hgh frequency current

 

 

Fuser roller

 

 

 

IH col

Smoothng crcut

 

 

 

 

C2

(IGBT)

 

 

Tr

 

C

 

IGBT

 

 

D

 

 

drve

 

 

 

T

 

 

 

Current nput

 

 

 

CPU

 

 

Photocoupler

Montorng nput current

 

 

 

 

 

Voltage

 

 

 

nput

 

 

 

 

 

I/F crcut on LGC board

Montorng nput current

[Block dagram of hgh frequency power supply]

Fig. 13-403

© 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved 13 -

e-STUDIO350/352/353/450/452/453

 

FUSER UNIT / PAPER EXIT SECTION

13

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Image 243
Toshiba 353, 452, 453, 350 service manual Image of current flowng from a to B, 13.4.2Heating principle of IH Heater
Page 242 Page 244

350, 353, 453, 452 specifications

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