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Induction heating unit, fixing apparatus, and image forming apparatus

A technology of electromagnetic induction heating and thermal fixing, which is applied in the fields of fixing devices, image forming devices, and induction heating units, and can solve the problems of overheating acceleration and cost increase in non-paper-feeding areas.

Active Publication Date: 2012-05-23
KONICA MINOLTA BUSINESS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the output of the excitation coil is increased, the overheating of the non-paper feeding area will be accelerated, so it is necessary to improve the demagnetization performance of the degaussing coil
[0007] Moreover, the cost increase due to the additional degaussing coil must be suppressed as much as possible

Method used

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  • Induction heating unit, fixing apparatus, and image forming apparatus
  • Induction heating unit, fixing apparatus, and image forming apparatus
  • Induction heating unit, fixing apparatus, and image forming apparatus

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Embodiment Construction

[0039] The following and other aspects, features and advantages of the present invention can be more clearly illustrated in conjunction with the following drawings describing specific embodiments of the present invention.

[0040] Next, embodiments of the induction heating unit, the fixing device, and the image forming apparatus of the present invention will be described with reference to the drawings.

[0041] [1] Structure of image forming apparatus

[0042] First, the configuration of the image forming apparatus of this embodiment will be described.

[0043] figure 1 is the main structure of the image forming apparatus showing the embodiment of the present invention. Such as figure 1 As shown, the image forming apparatus 1 includes: a document reading unit 100 , an image forming unit 110 , and a paper feeding unit 120 . The document reading unit 100 optically reads a document placed on a document table tray by an automatic document feeder (ADF: Automatic Document Feeder...

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Abstract

A magnetising coil (207) and demagnetising coils (215) are disposed in a fixing apparatus (115) that uses electromagnetic induction to heat a conductive heat-producing rotating body (206) and thermally fixes a toner image onto a recording sheet in one of a plurality of sizes. The magnetising coil (207) is arranged along the outer surface of the rotating body (206) and heats the rotating body (206) through electromagnetic induction heating. The demagnetising coils (215) are arranged in partially-overlapping proximity to the magnetising coil (207) and suppress overheating in a non-sheet-passing region of the rotating body (206) by partially cancelling out the flux produced by the magnetising coil (207) when fixing is performed on a small sheet. The demagnetising coils (215) are coil patterns (701) printed on a flexible substrate, and the wire width thereof is wider than the inter-wire distance of neighbouring wire segments.

Description

technical field [0001] The present invention relates to an induction heating unit, a fixing device, and an image forming apparatus, and more particularly, to an electrophotographic image forming apparatus that fixes a toner image on recording paper by electromagnetic induction heating, which enables miniaturization of the induction heating unit, and Reliable protection against overheating in non-feed areas. Background technique [0002] In recent years, in order to reduce power consumption and shorten image forming time, electrophotographic image forming apparatuses that fix toner images on recording paper by electromagnetic induction heating have been developed. In the electromagnetic induction heating type fixing device, an induction heating layer is provided on the heating member for heating the toner image, and the induction heating layer generates an induced current through an alternating magnetic field generated by an excitation coil facing the induction heating layer,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/20G03G15/00H05B6/10H05B6/36
CPCG03G15/2053G03G15/2042
Inventor 水藻义之
Owner KONICA MINOLTA BUSINESS TECH INC
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