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Heating device

A heating device and electromagnetic induction heating technology, applied in induction heating device, electric heating device, induction heating and other directions, can solve the problems of leakage, decrease of magnetic permeability of heating layer, increase of heating temperature of heating components, etc., to ensure safety, reduce Assembly man-hours and the effect of reducing the number of components

Inactive Publication Date: 2006-12-20
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In the heating device of this patent document 2, when the temperature adjustment control system cannot work normally due to device failure and the like, and the excess power is still supplied to the excitation coil, the heating temperature of the heating member will rise.
At this time, if the temperature of the heat-generating layer of the heating member exceeds the Curie temperature of the magnetic member used for the heat-generating layer, the magnetic permeability of the heat-generating layer will drop sharply, creating a magnetic circuit in the heat-generating layer flux, will produce a leakage

Method used

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Experimental program
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Embodiment approach 1

[0036] figure 1 It is a schematic cross-sectional view showing the overall configuration of an image generating device using the heating device according to Embodiment 1 of the present invention as a fixing device for heating and fixing an unfixed image on a recording medium.

[0037] Such as figure 1As shown, an image generating device 100 has an electrophotographic photosensitive element (hereinafter, referred to as a "photosensitive drum") 101, a charger 102, a laser beam scanner 103, a developing device 105, a paper feeding device 107, a fixing device 200, and a cleaning device. device 113 etc.

[0038] exist figure 1 Here, while the photosensitive drum 101 is rotationally driven in the direction of the arrow at a predetermined peripheral speed, its surface is uniformly charged at a negative predetermined dark potential VO by the charger 102 .

[0039] Laser beam scanner 103, the output is based on an image reading device not shown in the figure or a host such as a comp...

Embodiment approach 2

[0082] Next, the structure of the characteristic part of the heating apparatus concerning Embodiment 2 of this invention is demonstrated. Image 6 It is a schematic side view showing the structure of the heating device according to the second embodiment. Figure 7 represents the heating device according to Embodiment 2 Image 6 The B-B sectional view in . Such as Image 6 and Figure 7 As shown, the configuration of the heating device 600 according to the second embodiment is to operate the thermostat 301 by heat conduction of the flat heat conduction element 601 , and the other configurations are the same as those of the heating device 300 according to the first embodiment.

[0083] Here, the heat conduction element 601 is arranged between the wires of the excitation coil 231 with its plane along the turn direction of the wire of the excitation coil 231 , and the thermostat 301 is arranged on the side of the extended portion of the heat conduction element 601 .

[0084] T...

Embodiment approach 3

[0087] Next, the structure of the characteristic part of the heating apparatus concerning Embodiment 3 is demonstrated. Figure 8 It is a schematic plan view showing the structure of the heating device according to Embodiment 3. Figure 9 represents the heating device according to Embodiment 3 of the present invention Figure 8 The C-C sectional view in, Figure 10 It is a graph showing the calorific value of the heating device according to Embodiment 3 of the present invention.

[0088] Such as Figure 8 and Figure 9 As shown, in the heater 800, the thermostat 301 is arranged at the side end of the wire bundle of the exciting coil 231, sandwiched between the exciting coil 231 and the central core 232b, and other structures are related to the first embodiment The heating device 300 is the same.

[0089] In this heater 800, since the thermostat 301 is already provided at the side end of the wire bundle of the exciting coil 231, when the thermostat 301 is installed, it is ...

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Abstract

A heating device in which irrespective of the material and temperature characteristics of a heating body heated by electromagnetic induction, abnormally high temperature detecting means and temperature operating means can be quickly and infallibly operated through an inexpensive, compact structure when the temperature of the heating body becomes abnormally high. A thermostat (301) is disposed between bundles of conductors of exciting coils on the same side as exciting coils (231) with respect to a heating belt (210). Therefore, the thermostat (301) and the exciting coils (231) can be held together by a coil guide (234), and their wirings and terminals are disposed concentratedly at one portion. Therefore, the number of parts and the number of assembling steps can be decreased and the device body can be compactly structured at lower cost. Further, irrespective of whether or not the material of the heating belt (210) is magnetic and whether or not the temperature of the heating belt (210) is above the Cuie point, the thermostat (301) correctly operates if the heating belt (210) is heated to an abnormally high temperature.

Description

technical field [0001] The present invention relates to a heating device of an electromagnetic induction heating method, and in particular to a heating device suitable as a fixing device of an image forming device such as an electrophotography or electrostatic recording method copier, facsimile machine, and printer. Background technique [0002] In an electromagnetic induction heating (IH; induction heating) heating device, a magnetic field generated by a magnetic field generating unit acts on a heating element to generate an eddy current, and the heating element generates Joule heating by using the eddy current. This heating device can be used, for example, as a fixing device of an image forming apparatus that heat-fixes an unfixed image formed by an image forming unit on a recording medium such as transfer paper or an OHP film. [0003] Compared with the heat roller type fixing device using the halogen lamp as the heat source, the fixing device using the heating device of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B6/04H05B6/14G03G15/20
CPCH05B6/145G03G2215/2016G03G15/2039G03G2215/2032G03G15/2053G03G2215/2035
Inventor 田岛典幸马场弘一安田昭博藤本圭祐谷繁满谏山正幸
Owner PANASONIC CORP
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