Image fixing device

a fixing device and image technology, applied in the field of fixing devices, can solve the problems of affecting the efficiency of the electroconductive layer, and affecting the efficiency and achieve the effect of small restrictions on the thickness and material of the electroconductive layer and high efficiency

Active Publication Date: 2016-05-17
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The present invention provides a fixing device wherein restraints regarding the thickness and material of an electroconductive layer are small, and the electroconductive layer can be heated with high efficiency.

Problems solved by technology

However, with the fixing devices disclosed in the above-mentioned literatures, reducing the thickness of the heating rotary member being reduced, results in deterioration of heat efficiency.
Further, with regard to the fixing devices disclosed in the above-mentioned literatures, even in the event of employing a material of which the relative permeability is low, heat efficiency deteriorates.
Accordingly, the fixing devices disclosed in the above-mentioned literatures have a problem in that a material to be used as the electroconductive layer of the heating rotary member is restricted to a material having high relative permeability, and restraints are imposed on costs, material processing method, and device configuration.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

first embodiment

(1) Image Forming Apparatus Example

[0075]Hereinafter, an embodiment of the present invention will be described based on the drawings. FIG. 2 is a schematic configuration diagram of an image forming apparatus 100 according to the present embodiment. The image forming apparatus 100 according to the present embodiment is a laser-beam printer using an electrophotographic process. 101 denotes a rotating drum type electrophotographic photosensitive member (hereinafter, referred to as photosensitive drum) serving as an image supporting member, and is driven by rotation with predetermined peripheral velocity. The photosensitive drum 101 is evenly charged with a predetermined polarity and a predetermined potential by a charging roller 102 in the process of rotating. 103 denotes a laser beam scanner serving as an exposure unit. The scanner 103 outputs a laser beam L modulated according to image information to be input from an external device such as an unillustrated image scanner or computer ...

second embodiment

[0276]The present embodiment is another example regarding the first embodiment described above, and differs from the first embodiment in that austenitic stainless steel (SUS304) is employed as the cylindrical rotary member (electroconductive layer). The following is, as a reference, results of by summarizing resistivity and relative permeability in various types of metal, and calculating penetration depth δ at 21 kHz, 40 kHz, and 100 kHz in accordance with Expression (28).

[0277]

TABLE 7Penetration Depth of Cylindrical Rotary MemberRELATIVEPERME-δ (21δ (40δ (100ρ: RESISTIVITYABILITYkHZ)kHz)kHz)Ω· mμμmμmμmAg (SILVER)1.59E−081438317201Cu (COPPER)1.67E−081449325206Al2.75E−081576417264(ALUMINUM)Ni (NICKEL)6.84E−08600372717Fe (IRON)9.71E−08500483522SUS3047.20E−071.02291621131336

[0278]According to Table 7, SUS304 is high in resistivity, and low in relative permeability, and accordingly, penetration depth δ is great. That is to say, SUS304 readily penetrates electromagnetic waves, and accord...

third embodiment

[0311]With the present embodiment, description will be made regarding a configuration employing metal having high relative permeability as the cylindrical rotary member.

[0312]As with the present embodiment, with a configuration wherein the cylindrical rotary member is caused to generate heat principally by a circumference direction current, metal having low relative permeability does not necessarily have to be employed as the cylindrical rotary member, and even metal having high relative permeability can be employed.

[0313]With an electromagnetic induction heating system fixing device according to the related art, there has been a problem in that even when employing nickel having high relative permeability or the like as the cylindrical rotary member, in the event of reducing the thickness of the cylindrical rotary member, efficiency of power conversion is reduced. Therefore, the present embodiment illustrates that even in the event that the thickness of nickel is thin, the cylindric...

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PUM

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Abstract

A fixing device configured to fix an image on a recording material, includes: a rotary member including an electroconductive layer; a coil which has a spiral shaped portion and is disposed in the inside of the rotary member; and a core disposed in the spiral shaped portion; with magnetic resistance of the core being, with an area from one end to the other end of the maximum passage region of the image on the recording material regarding the generatrix direction, equal to or smaller than 30% of combined magnetic resistance made up of magnetic resistance of the electroconductive layer and magnetic resistance of a region between the electroconductive layer and the core.

Description

TECHNICAL FIELD[0001]The present invention relates to a fixing device to be installed in an image forming apparatus such as an electrophotographing system copying machine, printer, or the like.BACKGROUND ART[0002]In general, a fixing device to be installed in an image forming apparatus such as an electrophotographing system copying machine, printer, or the like, is configured to heat a recording material where an unfixed toner image is carried to fix the toner image on the recording material while transporting the recording material by a nip portion formed of a heating rotary member and a pressure roller which is in contact therewith.[0003]In recent years, an electromagnetic induction heating system fixing device whereby an electroconductive layer of a heating rotary member can directly be heated has been developed and put into practice. The electromagnetic induction heating system fixing device has an advantage in that warm-up time is short.[0004]With fixing devices disclosed in PT...

Claims

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Application Information

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Patent Type & AuthorityPatents(United States)
IPC IPC(8): G03G15/20H05B6/14H05B6/36
CPCG03G15/206G03G15/2017G03G15/2042H05B6/14H05B6/365G03G2215/2035
InventorNISHIZAWA, YUKIMANO, HIROSHIHAYASAKI, MINORUISONO, AOJIKURODA, AKIRAMIYAMOTO, TOSHIOUCHIDA, MICHIOUCHIYAMA, SEIJI
OwnerCANON KK