Unlock instant, AI-driven research and patent intelligence for your innovation.

Image fixing device with an induction coil around a heating roller

An imaging device and a technology of predetermined angles, which are applied in the direction of equipment, electric heating devices, induction heating devices, etc. that apply the electric recording process of charge patterns, and can solve problems such as uneven brightness, insufficient fixability, and low temperature of the heating roller.

Inactive Publication Date: 2005-09-07
PANASONIC CORP
View PDF1 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] As compared with the above, since the heat roller temperature is relatively low in the portion where the C-shaped core does not exist, the fixability is insufficient
Thus, disadvantages such as uneven fixation and uneven brightness are generated in the portion where the C-shaped core exists and in the portion where the C-shaped core does not exist.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Image fixing device with an induction coil around a heating roller
  • Image fixing device with an induction coil around a heating roller
  • Image fixing device with an induction coil around a heating roller

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example 〕

[0036] 1. Imaging equipment

[0037] Now, an outline of an imaging device according to an exemplary embodiment of the present invention will first be described. figure 1 is a diagram of the structure of an image forming apparatus according to an embodiment of the present invention. The image forming apparatus in this embodiment employs a tandem system. In the tandem system, a developing device is provided for each of four basic color toners that contribute particularly to color formation of a color image in an apparatus employing an electrophotographic system. Images of four colors are superimposed on the transfer body, and the superimposed color image is simultaneously transferred onto the sheet material. It should be understood, however, that the present invention is not limited to series systems. The present invention can be applied to an image forming apparatus of any system regardless of the number of developing devices and the presence or absence of an intermediate tr...

no. 2 example

[0073] Image 6 is a sectional view showing a heat generating portion of a fixing device as an image heater in a second embodiment of the present invention. Figure 7 is a bottom view showing the heat-generating portion of the fixing device with the heat-generating roller removed. Elements having the same functions as those in the first embodiment are marked with the same reference numerals and their descriptions are omitted.

[0074] The second embodiment differs from the first embodiment in the following points. That is, in the second embodiment, the coil bundle is not wound twice and is wound along the peripheral direction of the heating roller 130 , and a back core 210 is provided on the back of the magnetizing coil 170 .

[0075] The back core 210 covers a range where the magnetizing coil 170 does not exist, and an "opposite portion F" that is opposed to the heat generating roller 130 without the magnetizing coil 170 interposed therebetween is provided. Hereinafter, po...

no. 3 example

[0093] A fixing device as an image heater according to a third embodiment will now be described in detail.

[0094] In FIG. 8( a ), the thin fixing belt 230 is an endless belt whose base material is composed of polyimide, has a diameter of 50 mm, and a thickness of 100 μm. The surface of the fixing belt 230 is covered with a release layer (not shown) made of fluororesin with a thickness of 20 μm to apply a release property thereto. As the material of the base material, a particularly thin metal (such as nickel) produced by electro-casting having heat resistance, polyimide resin, fluororesin, and the like can be used. For the release layer, resins or rubbers having good release properties, such as PTFE, PFA, FEP, silicone rubber, fluororubber, etc., may be used alone, or they may be mixed and used as a mixture. When the fixing belt 230 is used to fix a monochromatic image, only the releasability may be ensured. However, when the fixing belt 230 is used to fix a color image, i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A fixing device is formed by using a heat generating roller having a sleeve of magnetic metal and a magnetizing coil (170) opposed to the outer peripheral of the heat generating roller and generating heat on the heat generating roller by an electromagnetic induction. The magnetizing coil may be formed by 60 copper wires bundled together whose surfaces are insulated and have the outside diameter of 0. 2 mm are drawn in the direction of rotation axis of the heat generating roller. The coil is wound around an ouiter circumference of the heat generating roller so that the bundles of wires in axial direction mutually come into close contact along the circumference of the heat generating roller to cover the upper half of the heat generating roller. Further, there may be many cores (240) arranged obliquely around the coil to heat uniformly along the axial direction of the heating roller by providing on average in any cross section the same magnetic flux density. Also, the coil (170) may extend in axial direction beyond the roller, to limit magnetic field variations resulting from marginal effects at the longitudinal ends of the coil.

Description

technical field [0001] The present invention relates to a fixing device used in an electrostatic recording type image forming apparatus (for example, a copying machine, a facsimile machine, a printer, etc.), and more particularly, to a fixing device for a toner image using an electromagnetic induction heating system , and an image forming apparatus using the fixing device. Background technique [0002] In recent years, business requirements such as energy saving and high-speed factors have increased for image forming apparatuses such as printers, copiers, and facsimiles. In order to achieve these desired performances, it is important to increase the thermal efficiency of a fixing device employed in an image forming apparatus. [0003] In an image forming apparatus, an image forming process by electrophotographic recording, electrostatic recording, magnetic recording, etc. corresponds to an image transfer system or a direct system (direct system) on a recording medium such a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/20H05B6/14
CPCG03G15/2078G03G2215/0119G03G15/2017G03G15/2082H05B6/145G03G15/2042G03G2215/2016
Inventor 志水忠文北川生一醒井政博松尾和德松崎圭一朝仓建治立松英树
Owner PANASONIC CORP