Induction heating roller device, heating roller for...

Details Induction heating roller device, heating roller for... Induction heating roller device, heating roller for...

2005-01-25

2005-01-25

Leung, Philip H. (Department: 3742)

Electric heating

Inductive heating

With heat exchange

C219S660000, C219S670000, C399S330000, C399S335000

Reexamination Certificate

active

06847019

ABSTRACT:
An induction heating roller, a fixing apparatus and an image forming apparatus are disclosed as including a heating roller (TR) comprised of a hollow roller base body (BB), composed of electrically insulating material, and a plurality of secondary coil components (ws), composed of closed circuits, respectively, which are formed over the roller base body. The heating roller (TR) internally receives an induction coil unit (IC) including a primary coil (wp) which is coupled with the secondary coils in a core-less transformer coupling relationship. The secondary coil components (ws) of the heating roller (TR) have a secondary resistance value (Ra) which is nearly equal to a secondary reactance (Xa), i.e. in case of Ra/Xa=α, a formula is expressed as 0.1<α<10. Further, the primary coil (wp) of the induction coil unit (IC) is comprised of a plurality of coil components which are connected between a wire pair (WP) in parallel to one another.

REFERENCES:
patent: 2181274 (1939-11-01), Jackson et al.
patent: 4908489 (1990-03-01), Panecki et al.
patent: 6255632 (2001-07-01), Yokoyama et al.
patent: 6292647 (2001-09-01), Ishida
patent: 54-140241 (1979-10-01), None
patent: 59-33787 (1984-02-01), None
patent: 2000-215971 (2000-08-01), None
patent: 2000-215974 (2000-08-01), None

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