WO2006011454A1 - 発熱ローラ、定着装置、および画像形成装置 - Google Patents
発熱ローラ、定着装置、および画像形成装置 Download PDFInfo
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- WO2006011454A1 WO2006011454A1 PCT/JP2005/013593 JP2005013593W WO2006011454A1 WO 2006011454 A1 WO2006011454 A1 WO 2006011454A1 JP 2005013593 W JP2005013593 W JP 2005013593W WO 2006011454 A1 WO2006011454 A1 WO 2006011454A1
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- conductive layer
- heat generating
- fixing device
- roller
- heat
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2039—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature
- G03G15/205—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat with means for controlling the fixing temperature specially for the mode of operation, e.g. standby, warming-up, error
Definitions
- Heat generating roller, fixing device, and image forming apparatus Heat generating roller, fixing device, and image forming apparatus
- the present invention relates to a fixing device used in an image forming apparatus such as an electrophotographic or electrostatic recording type copying machine, facsimile, and printer, and more particularly, records an unfixed image by an electromagnetic induction heating method.
- the present invention relates to a fixing device that heats and fixes to a material, and an image forming apparatus using the fixing device.
- an electromagnetic induction heating type fixing device an alternating current is applied to an exciting coil, and a magnetic flux that repeatedly generates and disappears is generated around the exciting coil.
- An eddy current is generated when the generated magnetic flux passes through the conductor, and heat generated by the conductor due to the eddy current is used for fixing an unfixed image.
- heat generated by the conductor is transmitted to an ep formed by two rollers, and when the recording material passes through the nip, the pressure by the rollers and the transmitted heat are used.
- the toner on the recording material is fixed.
- the roller forming the two cups itself is formed of the conductor, or a thin film is formed on one of the rollers forming the two cups with the conductor. You can suspend the belt.
- the heat transmitted to the two cups is taken away by the surrounding members of the recording material passing through the two cups, and the temperature of the rollers and belts that transmit the heat to the two cups is lowered.
- the width of the recording material passing through the two-pipe is various, and heat is not always taken from the entire width of the roller or belt.
- the entire roller width of the heat-generating roller formed of a conductor always makes contact with the recording material in a two-ply manner. Therefore, when a narrow recording material passes through the nip, heat is not taken away from a portion that does not contact the recording material. Therefore, the recording material width of the heat roller The outside may be too hot. When a wide recording material is passed in a state where the temperature of such a portion is higher than the fixing temperature suitable for fixing the toner, the toner once transferred to the recording material is reattached to the heating roller. An offset occurs. In addition, the life of the rubber member that contacts the heat roller may be significantly shortened.
- the Curie temperature is a temperature that is a threshold value for the presence or absence of magnetic properties of the magnetic shunt metal, and even at a normal temperature, even a magnetic shunt metal having ferromagnetism loses magnetism at a temperature exceeding the Curie temperature.
- a material having a Curie temperature equal to the fixing temperature is used as the material of the conductive layer of the film that generates heat. This reduces the eddy current and suppresses heat generation.
- Patent Document 1 Japanese Patent Laid-Open No. 7-114276
- the magnetic shunt metal has an excessive skin resistance and also has a large inductance at the time of coupling, so that even if excited by an exciting coil, an eddy current hardly occurs. For this reason, there is a problem that it takes time to warm up until the temperature required for fixing is increased.
- image forming apparatuses such as copiers, facsimiles, and printers raise the temperature of the fixing device to a temperature required for toner fixing when the power is turned on or after returning from the sleep state. Therefore, it takes a long time to actually form an image.
- the specific resistance is electromagnetic induction heating an integer ⁇ genus 70 X 10- 6 ⁇ cm (ohm-cm) with an alternating current having a frequency 20 kHz (Ruth to kilometers), magnetic shunt metal skin resistance of the 33 ⁇ 41 ⁇ 10- 4 ⁇ (ohm). This value is too large is also seen from Table skin resistance 8.8 chi 10- 4 Omega induction heating easy iron, because the inductance is large, an eddy current is Kuku calorific flow is small.
- An object of the present invention is to reduce the warm-up time and eliminate the abnormal excessive temperature rise outside the recording material width, thereby preventing the occurrence of offset, breakage of the rubber member, and life deterioration. It is an object of the present invention to provide a fixing device capable of realizing excellent fixing performance.
- the fixing device of the present invention is generated in the magnetic field by being arranged in the magnetic field formed by the excitation means to which a voltage is applied and forms a magnetic field around at least a part of the excitation means.
- a heating unit that generates heat by penetrating the magnetic flux inside; and a fixing unit that heats and fixes an image formed on the recording material using the heat of the heating unit.
- a magnetically permeable conductive layer made of a magnetic shunt material that has magnetism and loses magnetism at a predetermined temperature or more, and a nonmagnetic conductive layer laminated on the exciting means side of the permeable conductive layer are employed. .
- the heat generating roller according to the present invention is a heat generating roller that is disposed in a magnetic field formed by the excitation means and generates heat by penetrating the magnetic flux generated in the magnetic field into the magnetic field. And a non-magnetic conductive layer laminated on the exciting means side of the magnetically permeable conductive layer. .
- FIG. 1 is a diagram showing a schematic configuration of an image forming apparatus according to an embodiment of the present invention.
- FIG. 2 (a) is a cross-sectional view showing the configuration of the fixing device according to Embodiment 1, and (b) is another cross-sectional view showing the configuration of the fixing device according to Embodiment 1.
- FIG. 3 is a partial cross-sectional view showing a detailed configuration of the heat generating roller according to the first embodiment.
- FIG. 4 is a diagram showing an equivalent circuit of a system including a heating roller and an excitation coil according to Embodiment 1.
- FIG. 5 is a diagram showing a change in resistance R of the equivalent circuit according to Embodiment 1.
- FIG. 6 is a diagram showing a change in inductance L of the equivalent circuit according to Embodiment 1.
- FIG. 7 is a diagram showing a change in the coupling coefficient k of the equivalent circuit according to Embodiment 1.
- FIG. 8A is a cross-sectional view showing a configuration of a fixing device according to Embodiment 2 of the present invention
- FIG. 8B is another cross-sectional view showing a configuration of the fixing device according to Embodiment 2.
- FIG. 9 is a diagram showing the relationship between the thickness of the nonmagnetic conductor according to Embodiment 2 and the resistance of the equivalent circuit
- FIG. 10 is a diagram showing a change in resistance R of the equivalent circuit according to Embodiment 2.
- FIG. 11 is a diagram showing a change in inductance L of the equivalent circuit according to Embodiment 2.
- FIG. 12 is a diagram showing a change in the coupling coefficient k of the equivalent circuit according to Embodiment 2.
- FIG. 13 is a cross-sectional view showing a configuration of a fixing device according to Embodiment 3 of the present invention.
- FIG. 14 is a partial cross-sectional view showing a detailed configuration of the heat generating roller according to the third embodiment.
- FIG. 15 (a) is a cross-sectional view showing the configuration of the fixing device according to Embodiment 4 of the present invention, and (b) is another cross-sectional view showing the configuration of the fixing device according to Embodiment 4.
- FIG. 15 (a) is a cross-sectional view showing the configuration of the fixing device according to Embodiment 4 of the present invention, and (b) is another cross-sectional view showing the configuration of the fixing device according to Embodiment 4.
- FIG. 16 (a) is a cross-sectional view showing the configuration of the fixing device according to Embodiment 5 of the present invention, and (b) is another cross-sectional view showing the configuration of the fixing device according to Embodiment 5.
- FIG. 17 is a view showing a modification of the nonmagnetic conductor according to Embodiment 5
- the present inventors have taken time S to heat up in heat fixing using a magnetic shunt metal having a set Curie temperature, and when only the magnetic shunt metal is heated alone, the recording material width It was found that when the outer part of the material exceeded the Curie temperature, the magnetic coupling of the part became good and the calorific value could not be sufficiently suppressed.
- the essence of the present invention is that a nonmagnetic conductive layer is provided between the exciting coil and the magnetic shunt metal excited by the exciting coil to promote heat generation of the magnetic shunt metal until the Curie temperature is reached.
- FIG. 1 is a diagram showing a schematic configuration of an image forming apparatus according to Embodiment 1 of the present invention.
- an electrophotographic photosensitive member hereinafter referred to as “photosensitive drum” 101 is rotatably disposed in an image forming apparatus main body 100 of this image forming apparatus.
- the surface of the photosensitive drum 101 is uniformly charged to a predetermined negative dark potential V0 by the charger 102 while being rotated at a predetermined peripheral speed in the direction of the arrow.
- the laser beam scanner 103 outputs a laser beam 104 modulated in accordance with a time-series electric digital pixel signal of image information input from a host device such as an image reading device or a computer (not shown).
- the uniformly charged surface of the photosensitive drum 101 is subjected to scanning exposure by a laser beam 104.
- the absolute value of the potential of the exposed portion of the photosensitive drum 101 decreases to a bright potential VL, and an electrostatic latent image is formed on the surface of the photosensitive drum 101.
- This electrostatic latent image is reversely developed by the negatively charged toner of the developing device 105 to be a visible image (toner image).
- the developing device 105 includes a developing roller 106 that is rotationally driven.
- the developing roller 106 is disposed so as to face the photosensitive drum 101, and a thin layer of toner is formed on the outer peripheral surface thereof.
- the developing roller 106 is applied with a developing bias voltage whose absolute value is smaller than the negative potential V0 of the photosensitive drum 101 and larger than the light potential VL.
- the toner on the developing roller 106 is transferred only to the light potential VL portion of the photosensitive drum 101, and the electrostatic latent image is visualized, and an unfixed toner image (hereinafter, “ 111) is formed.
- a recording sheet 109 as a recording material is fed from the sheet feeding unit 107 one by one by a feeding roller 108.
- the fed recording paper 109 passes through a pair of registration rollers 110 and is fed to the ep of the photosensitive drum 101 and the transfer roller 112 at an appropriate timing synchronized with the rotation of the photosensitive drum 101.
- the toner image 111 on the photosensitive drum 101 is transferred onto the recording paper 109 by the transfer roller 112 to which a transfer bias is applied.
- the recording paper 109 on which the toner image 111 is formed and supported in this manner is guided by the recording paper guide 114 and separated from the photosensitive drum 101, and then is heated and fixed (hereinafter referred to as “fixing device”). It is conveyed toward 200 fixing parts. Then, the toner image 111 is heated and fixed by the fixing device 200 onto the recording paper 109 conveyed to the fixing portion.
- the recording paper 109 on which the toner image 111 has been heat-fixed passes through the fixing device 200 and is then discharged onto a paper discharge tray 115 disposed outside the image forming apparatus main body 100.
- Residues such as transfer residual toner on the surface of the photosensitive drum 101 from which the recording paper 109 has been separated are removed by the cleaning device 113, and are repeatedly used for the next image formation.
- FIGS. 2A and 2B are cross-sectional views showing the configuration of the fixing device 200 according to the present embodiment.
- FIG. 2 (a) shows the magnetic path of the magnetic flux M in a state below the Curie temperature
- FIG. 2 (b) shows the magnetic path of the magnetic flux M in a state exceeding the Curie temperature.
- the fixing device 200 includes a heat generating roller 210, a pressure roller 220, a temperature sensor 230, and an exciting coil unit 240.
- the heating roller 210 is a cylindrical roller having a bottom diameter of 34 mm (millimeters), for example, and rotates around the central axis so as to convey the recording paper 109 on which the toner image 111 is formed and conveyed in the direction of the arrow (see FIG. (Counterclockwise)
- the heat generating roller 210 is mainly formed by laminating a highly permeable conductive layer 212 and a nonmagnetic conductive layer 214. More specifically, as shown in FIG. 3, the highly permeable conductive layer 212, the nonmagnetic conductive layer 214, and the protective two-layered layer (hereinafter referred to as “the protective layer”) in order from the side closer to the central axis of the heat generating roller 210. 216) and release layer 218 are laminated.
- the total thickness of the heat generating roller 210 is preferably 100 to 1000 ⁇ m (micrometer).
- the highly magnetically conductive layer 212 is composed of a magnetic shunt gold whose Curie temperature is set to a predetermined temperature. It consists of a genus and is formed into a cylindrical shape with a wall thickness of, for example, 500 xm. Considering the heat capacity of the heat generating roller 210, it is desirable to make the highly magnetically permeable conductive layer 212 thin to reduce the heat capacity and to quickly raise the temperature of the heat generating roller 210. However, if the Curie temperature is exceeded, as shown in Fig. 2 (b), the skin depth, which is the depth at which the magnetic flux ⁇ penetrates the heat generating roller 210, becomes deep. However, it may penetrate through this layer and heat surrounding members other than the heating port 210.
- the high magnetic permeability conductive layer 212 needs to be thicker than the skin depth of the magnetic shunt metal forming this layer. Specifically, the thickness of the high magnetic permeability conductive layer 212 is desirably 300 / im force im ⁇ .
- the magnetic shunt metal forming the high magnetic permeability conductive layer 212 for example, an alloy of iron and nickel or an alloy of iron, nickel and chromium is used.
- the Curie temperature of the magnetic shunt metal can be set to a predetermined temperature by adjusting the composition of these metals. In this embodiment, it is assumed that the Curie temperature of the magnetic shunt metal forming the highly permeable conductive layer 212 is set to 220 degrees close to the fixing temperature of the toner. Therefore, the highly permeable conductive layer 212 exhibits a characteristic as a non-magnetic material when the temperature exceeds 220 degrees C. Note that the Curie temperature is not limited to 220 degrees and may be set to a lower temperature.
- the nonmagnetic conductive layer 214 is made of, for example, a nonmagnetic material such as copper, and the outer peripheral surface of the highly permeable conductive layer 212 is processed by plating, metalizing, or cladding, and has a thickness. For example, a 5 zm layer.
- a thickness For example, a 5 zm layer.
- the material of the nonmagnetic conductive layer 214 in addition to the aluminum, silver, and gold or the like may be of desirable tool copper ones resistivity below 10 X 10- 6 ⁇ cm.
- the thickness of the nonmagnetic conductive layer 214 is preferably about 2 to 30 xm.
- the nonmagnetic conductive layer 214 can also be made thin to reduce the heat capacity in the same manner as the high magnetic permeability conductive layer 212 described above. desirable.
- the thickness is less than 2 xm, the actual resistance becomes excessive, and the generation of eddy current is hindered, resulting in a decrease in heat generation.
- the Ni layer 216 is formed on the outer peripheral surface of the nonmagnetic conductive layer 214 by plating, metalizing, or cladding. This is a nickel layer made of a material and having a thickness of, for example, 2 zm.
- the Ni layer 216 covers the surface of the nonmagnetic conductive layer 214, thereby preventing oxidation of the nonmagnetic conductive layer 214 and improving durability, and improving adhesion of the release layer 218 and preventing peeling. .
- a protective layer having a thickness of 2 to 10 zm using chromium or zinc may be formed. When the thickness of the protective layer is 2 zm or less, the protective layer may not function sufficiently. On the other hand, when it exceeds 10 zm, the heat capacity of the protective layer increases and it takes time to warm up.
- the release layer 218 is made of a fluororesin such as PTFE, PFA, or FEP, and is a layer formed on the outer surface of the heat roller 210 and having a thickness of, for example, 20 / im.
- a silicon rubber layer may be provided between the Ni layer 216 and the release layer 218 so that the heat generating roller 210 has elasticity.
- the pressure roller 220 is pressed against the heat roller 210 to form an EP through which the recording paper 109 passes.
- the caloric pressure roller 220 is rotated around the central axis (clockwise in the figure) so as to convey the recording paper 109 in the direction of the arrow, following the rotation of the heat generating roller 210.
- the force that the pressure roller 220 is driven by the rotation of the heat generating roller 210 may rotate the pressure roller 220 to drive the heat generating roller 210.
- the pressure roller 220 is formed of a material having low thermal conductivity such as hard SJISA 30 degree silicon rubber.
- a material of the pressure roller 220 for example, heat-resistant resin such as fluoro rubber and fluoro resin or other rubber may be used.
- resin or rubber such as PTFE, PFA, or FEP alone or mixed.
- the temperature sensor 230 is provided in contact with the outer peripheral surface of the heat generating roller 210 on the downstream side in the rotation direction from the exciting coil unit 240 of the heat generating roller 210, and detects the temperature of the heat generating roller 210.
- a control unit instructs the feeding roller 108 to start feeding the recording paper 109, or from the power source to the exciting coil unit 240, not shown.
- the supply of alternating current is controlled. More specifically, if the temperature sensor 230 detects that the temperature of the heat generating roller 210 has reached a temperature suitable for fixing the toner image 111, a control unit (not shown) feeds the feed roller.
- the start of operation of the printer 108 is instructed, and printing is started.
- the temperature sensor 230 detects that the temperature of the heat generating roller 210 is higher than a predetermined threshold, the supply of alternating current from the power source (not shown) to the exciting coil unit 240 is controlled.
- the excitation coin unit 240 has a coil holding member 242, an excitation coil 244, and a core member 246.
- the coil holding member 242 is formed of a semi-cylindrical insulator disposed to face the outer peripheral surface of the upper half of the heat generating roller 210.
- the exciting coil 244 is formed by rotating a conducting wire on the surface opposite to the surface facing the heat generating roller 210 of the coil holding member 242, and a voltage is applied from a power source (not shown) to allow an alternating current to flow.
- a magnetic field is generated by generating a magnetic flux around.
- the core member 246 is made of a magnetic material having a high magnetic permeability and specific resistance, such as ferrite and permalloy, and is disposed so as to cover the exciting coil 244. Specifically, the core member 246 is in contact with the coil holding member 242 at the center of winding of the conducting wire forming the exciting coil 244 and the outermost periphery of the winding, and is held in the other portions with the exciting coil 244 interposed therebetween. It is substantially parallel to the member 242.
- the core member 246 serves as a magnetic path for the magnetic flux generated on the side opposite to the heating roller 210 out of the magnetic flux generated by the exciting coil 244.
- the exciting coil unit 240 excites the heat generating roller 210 from the outside of the heat generating roller 210, so that the work efficiency of maintenance of replacing parts such as the heat generating roller 210 which is a consumable item is improved. It is good.
- the temperature of the heat generating roller 210 is equal to or lower than the Curie temperature.
- the temperature of the heat generating roller 210 of the fixing apparatus 200 continues to drop to about room temperature, which is significantly higher than the Curie temperature of 220 degrees in the present embodiment. The temperature is low.
- the heating roller 210 is heated to a temperature suitable for fixing the toner image 111.
- a voltage is applied to the excitation coil 244 of the power source excitation coil unit 240 (not shown), and an alternating current flows.
- the frequency of this alternating current is 20 ⁇ : 100kHz Is desirable. In the present embodiment, this frequency is set to 20 to 60 kHz.
- a magnetic flux M is generated around the excitation coil 244 as shown in FIG. 2 (a). The generated magnetic flux M passes through the nonmagnetic conductive layer 214 of the heat roller 210 and reaches the highly permeable conductive layer 212, and permeates near the outer peripheral surface of the highly permeable conductive layer 212 due to the skin effect.
- an eddy current for canceling the magnetic flux M is generated in the vicinity of the outer peripheral surfaces of the nonmagnetic conductive layer 214 and the highly permeable conductive layer 212, and the nonmagnetic conductive layer 214 and the highly permeable conductive layer 212 are caused by Joule heat. Fever.
- the heat generating roller 210 is formed by laminating the highly magnetically conductive layer 212 and the nonmagnetic conductive layer 214, the heat generating roller 210 and the exciting coil 244 are included. The magnetic coupling of the system is improved, and the heat generation of the heating roller 210 is promoted
- the highly permeable conductive layer 212 becomes non-magnetic and the skin depth increases as shown in FIG. 2 (b).
- the magnetic flux M penetrates to the vicinity of the inner peripheral surface of the highly permeable conductive layer 212.
- the skin resistance is inversely proportional to the skin depth, so when the Curie temperature is exceeded, the skin resistance decreases, the generation of joule heat is suppressed, and the heating value of the heating roller 210 is Decrease.
- the system composed of the heating roller 210 and the excitation coil 244 according to the present embodiment includes the resistance r and inductance L1 of the excitation coil 244 (primary side), It can be expressed by the resistance R2 and inductance L2 of the heating roller 210 (secondary side) electromagnetically coupled to the exciting coil 244 and the mutual inductance M between the primary side and the secondary side.
- the coupling coefficient k indicating the quality of the magnetic coupling between the primary side and the secondary side is expressed by (Equation 2).
- Fig. 5 and subsequent figures show the measured temperature characteristics of these primary and secondary combined resistors as R and combined inductance as L.
- Fig. 5 shows the measured values of the temperature and resistance R of the heating roller 210 at an alternating current frequency of 20 kHz
- Fig. 6 shows the measured values of the temperature and inductance L of the heating roller 210 at an alternating current frequency of 20 kHz.
- Figure 7 shows FIG. 6 is a diagram showing the correspondence between the temperature of the heat generating roller 210 and the coupling coefficient k at a flow current frequency of 20 kHz.
- a curve 310r plotted with white circles indicates the resistance R according to the present embodiment.
- Curve 320r plotted with black circles shows the resistance when a magnetic shunt metal is used as a heating roller.
- Curve 330r plotted with black triangles shows resistance when iron is used as a heating roller. Show me.
- the resistance R according to the present embodiment is constant at about 2.0 ⁇ , which is larger than the resistance of the magnetic shunt metal alone or iron. This means that a large amount of Joule heat is generated in the heat generating roller 210, and heat generation is promoted more than when a magnetic shunt metal or iron is used for the heat generating roller.
- the resistance R decreases to the same level as the resistance of the magnetic shunt metal alone, and it can be seen that the amount of heat generation is greatly reduced. On the contrary, the resistance of the magnetic shunt metal is almost unchanged in the section 350r. In addition, since the Curie temperature of iron is very high at 769 degrees, the resistance does not change greatly even in the section 350r, and the calorific value does not decrease.
- a curve 3101 with white circles plotted represents the inductance L according to the present embodiment.
- a curve 3201 plotted with black circles shows the inductance when a magnetic shunt metal is used as a heating roller, and a curve 3301 plotted with black triangles shows the inductance when iron is used as a heating roller. Show.
- the inductance L according to the present embodiment is about 30 ⁇ (microhenry) to 37 ⁇ , which is 45 ⁇ or more. It is smaller than the inductance of the magnetic shunt metal. This shows that it is easier to apply power than when a magnetic shunt metal is used as a heating roller.
- both the inductance L and the inductance of the magnetic shunt metal unit are reduced and both values are close to each other. Also, iron inductance gradually increases as temperature rises.
- a curve 310k on which white circles are plotted represents the coupling coefficient k according to the present embodiment.
- the curve 320k with black circles plotted shows the heat-generating
- the curve 330k in which the black triangles are plotted shows the coupling coefficient when iron is used for the heating roller.
- the coupling coefficient k is about 0.80, which is larger than the coupling coefficient of the magnetic shunt metal or iron. This means that the system consisting of the heating roller 210 and the excitation coil 244 has good magnetic coupling, and heat is generated more efficiently than when a magnetic shunt metal or iron is used for the heating hole roller. .
- the coupling coefficient k decreases to the same degree as the coupling coefficient of the magnetic shunt metal or iron, and it can be seen that the efficiency of heat generation deteriorates. Therefore, in the section 350k, the heat generation amount of the heat generating roller 210 is reduced and the temperature rise is suppressed.
- the coupling coefficient of the magnetic shunt metal alone tends to increase in the section 350k, and it can be seen that the heat generation efficiency increases when the Curie temperature is exceeded.
- the iron coupling coefficient does not change rapidly as the temperature rises, and is stable at about 0.65 to 0.70.
- the change in the parameter depending on the temperature of the heat generating roller 210 formed by laminating the highly permeable conductive layer 212 and the nonmagnetic conductive layer 214 and the heat generating roller using the magnetic shunt metal alone are compared. Then, it can be seen that the heating roller 210 is more likely to generate heat at temperatures lower than the Curie temperature.
- the non-magnetic conductive layer 214 on the highly permeable conductive layer 212 which is a magnetic shunt metal
- the heat generation of the heat generating roller 210 at low temperatures can be promoted, and the entire fixing roller 210 can be heated from the normal temperature to the Curie temperature. It is possible to reduce the warm-up time of the fixing device 200 that raises the fixing temperature to the following fixing temperature as compared with the case of using a magnetic shunt metal alone.
- the nonmagnetic conductive layer 214 is laminated on the highly magnetically conductive layer 212, which is a magnetic shunt metal, so that the heat generation is suppressed more strongly than in the case of a magnetic shunt alloy alone. It will be.
- the difference in heat generation between the part below the Curie temperature within the recording material width and the part near the Curie temperature outside the recording material width can be greatly expanded, the amount of heat generation outside the recording material width is minimized and the temperature rises. It is possible to reliably suppress the occurrence of hot offset and damage to the members around the heat generating roller 210 that are vulnerable to high heat and deterioration of the service life.
- Embodiment 2 of the present invention is that a non-magnetic conductor is arranged inside the heat generating roller, and when the temperature of the heat generating roller partially becomes close to the Curie temperature, the excessive temperature increase in that part is more effective. In addition, the warm-up time is further shortened by thinning the highly permeable conductive layer of the heat generating roller.
- FIGS. 8A and 8B are cross-sectional views showing the configuration of the fixing device 200 according to the present embodiment.
- FIG. 8 (a) shows the magnetic path of the magnetic flux M in a state below the Curie temperature
- FIG. 8 (b) shows the magnetic path of the magnetic flux M in a state exceeding the Curie temperature.
- the fixing device 200 according to the present embodiment includes a heat generating roller 210a instead of the heat generating roller 210 of the fixing device 200 according to the first embodiment, and has a configuration in which a nonmagnetic conductor 410 and an auxiliary roller 420 are added. ing.
- the heating roller 210a is a cylindrical roller having a bottom diameter of, for example, 34 mm, and rotates around the central axis so as to convey the recording paper 109 on which the toner image 111 is formed and carried in the direction of the arrow ( (Clockwise in the figure).
- the heat generating roller 210a is mainly formed by stacking the high magnetic permeability conductive layer 212a and the nonmagnetic conductive layer 214.
- the thickness of the high magnetic permeability conductive layer 212a is the same as that of the first embodiment. Is different.
- the other layers are the same as those of the heating roller 210 (Fig. 3) of the first embodiment.
- the high magnetic permeability conductive layer 212a is formed into a cylindrical shape with a thickness of, for example, 200 ⁇ m. Since the high magnetic permeability conductive layer 212a is thinner than the high magnetic permeability conductive layer 212 of Embodiment 1, the temperature of the heat generating roller 210a can be quickly increased from the viewpoint of the heat capacity described above. It is desirable that the thickness of the high magnetic permeability conductive layer 212a be 100 to 700/1111.
- the nonmagnetic conductor 410 is made of a semi-cylindrical nonmagnetic material having a thickness of, for example, 500 ⁇ m, and is disposed to face the exciting coil unit 240 with the peripheral surface of the heat roller 210a interposed therebetween.
- the material of the nonmagnetic conductor 410 for example, copper, aluminum, silver, gold, and the like can be applied in the same manner as the material of the nonmagnetic conductive layer 214.
- Fig. 8 (b) when the heating roller 210a exceeds the Curie temperature, the skin depth increases and the magnetic flux M penetrates the heating roller 210a, and the nonmagnetic conductor 410 has a magnetic flux.
- the thickness of the nonmagnetic conductor 410 is about 200 to 2000111. The reason for this will be explained below.
- FIG. 9 is a diagram showing the resistance R of the equivalent circuit of the system including the heating roller 210a and the exciting coil 244 when the frequency of the alternating current is 20 kHz and the thickness of the nonmagnetic conductor 410 is changed. It is. However, in the figure, the resistance R when copper is used as the nonmagnetic conductor 410 and the temperature of the heating roller 210a is a high temperature near the Curie temperature is shown. When the temperature of the heating port 210a is high around the Curie temperature, it is desirable to suppress the heat generation. Therefore, the thickness of the nonmagnetic conductor 410 should be a value that makes the resistance R as low as possible.
- the thickness of the nonmagnetic conductor 410 is at least about 0.2 mm, heat generation can be suppressed at a high temperature near the Curie temperature.
- the thickness of the nonmagnetic conductor 410 is excessively thick, heat is taken from the heat generating roller 210a and the heat generation of the heat generating roller 210a is obstructed, so the maximum is about 2000 / im. Is desirable.
- the auxiliary roller 420 is formed with a rubber layer 424 made of silicon rubber having high heat insulation on the surface of the cored bar 422.
- a rubber layer 424 made of silicon rubber having high heat insulation on the surface of the cored bar 422.
- the heat generating roller 210a is thin and the mechanical strength is weakened, there is a possibility that the heat generating roller 210a is deformed by the pressure contact with the pressure roller 220.
- an auxiliary roller 420 that is rotatable so as to press the heat generating roller 210a from the inside during the ep is disposed.
- the auxiliary roller 420 is not limited to this form, and the contact portion with the heat generating roller 210a, which may be constituted by a fixed pressure plate or the like, is preferably highly heat insulating.
- the highly permeable conductive layer 212a becomes nonmagnetic, and the magnetic flux M passes through this layer as shown in FIG. 8 (b). To penetrate.
- the magnetic flux M penetrating through the highly permeable conductive layer 212a enters the nonmagnetic conductor 410 and creates a repulsive magnetic field. Produced and reduces the magnetic flux.
- the generation of eddy currents in the heating roller 210a is also suppressed, and as described above, since the resistance of the entire system is small at high temperatures, the heat generation amount of the heating roller 210a is greatly reduced.
- the nonmagnetic conductor 410 is made of a material having a small specific resistance and is thick, so that the skin resistance is small and the heat generation is small.
- the nonmagnetic conductor 410 is disposed inside the heat generating roller 210a, the magnetic coupling when the Curie temperature is exceeded becomes weak, and the heat generation Heat generation of the roller 210a is more strongly suppressed. As a result, it is possible to effectively prevent the temperature of the heat generating roller 210a outside the paper material from becoming abnormally high, particularly when a narrow recording material is continuously passed.
- a curve 510r in which white squares are plotted indicates the resistance R according to the present embodiment.
- a curved line 310r plotted with white circles indicates the resistance R according to the first embodiment, and a curved line 520r plotted with black squares indicates the resistance when a magnetic shunt metal is used as a heating roller.
- a curve 530r in which triangles are plotted shows the resistance when aluminum is used as the material of the nonmagnetic conductor 410.
- the resistance R according to the present embodiment is almost the same as the resistance R according to the first embodiment, and is larger than the resistance of the magnetic shunt metal alone.
- heat generation is promoted almost similarly.
- the resistance R due to the lamination of the highly permeable conductive layer 212a and the nonmagnetic conductive layer 214 which has little relation to the presence or absence of the nonmagnetic conductor 410 and the material, is R It can be said that the effect of the increase is dominant. This is supported by the fact that the magnetic flux M penetrates only to the vicinity of the outer peripheral surfaces of the nonmagnetic conductive layer 214 and the highly permeable conductive layer 212a in the section 540r (see Fig. 8 (a)).
- the resistance R decreases to a value lower than the resistance of the magnetic shunt metal according to the first embodiment, and the amount of generated heat further decreases.
- the temperature exceeds the Curie temperature and the skin depth increases, the magnetic flux M penetrates the heating roller 210a and enters the nonmagnetic conductor 410 that does not easily generate heat. This is probably because an eddy current is generated in the conductor 410 in the direction to cancel the magnetic flux M, and the magnetic flux M is reduced as compared with the case of the first embodiment.
- aluminum is used for the nonmagnetic conductor 410, the tendency is almost the same as when copper is used.
- a curve 5101 in which white squares are plotted shows the inductance L according to the present embodiment.
- a curve 3101 in which white circles are plotted shows the inductance L according to the first embodiment, and a curve 5201 in which black squares are plotted shows the inductance when a magnetic shunt metal is used as a heating roller.
- a curve 5301 in which triangles are plotted shows the inductance when aluminum is used as the material of the nonmagnetic conductor 410.
- inductance L according to the present embodiment is substantially the same as inductance L according to the first embodiment, and is based on the inductance of the magnetic shunt metal alone. Is also small. Therefore, as in the first embodiment, when the nonmagnetic conductive layer 214 is laminated, the laminating power S angle is greater when the nonmagnetic conductive layer 214 is laminated than when the magnetic shunt metal alone is used for the heating roller.
- the inductance L according to the present embodiment rapidly decreases to a value smaller than the inductance L according to the first embodiment.
- the same tendency as the inductance according to the present embodiment is shown. This is because, when the temperature exceeds the Curie temperature, the magnetic flux M penetrates the heating roller 21 Oa and enters the nonmagnetic conductor 410, so that an eddy current is generated in the nonmagnetic conductor 410 in the direction to cancel the magnetic flux M. This is considered to be because the magnetic flux M decreases compared to the case of.
- a curve 510k in which white squares are plotted represents the coupling coefficient k according to the present embodiment.
- a curved line 310k plotted with white circles indicates the coupling coefficient k according to the first embodiment, and a curved line 520k plotted with black squares indicates that the magnetic shunt metal is a heating roller.
- a curve 530k in which a white triangle is plotted indicates a coupling coefficient when aluminum is used as the material of the nonmagnetic conductor 410.
- the coupling coefficient k according to the present embodiment is almost the same as the coupling coefficient k according to the first embodiment, and the coupling coefficient of the magnetic shunt metal alone. Bigger than ,.
- the coupling coefficient k according to the present embodiment is reduced to a value smaller than the coupling coefficient k according to the first embodiment, and the efficiency of heat generation is further deteriorated.
- the present embodiment in a state where the temperature is higher than the Curie temperature, the amount of heat generated by the heat roller 210a is reduced as compared with the first embodiment, and the temperature rise is further suppressed.
- both values are the nonmagnetic conductor 410.
- the difference is larger than that of the first embodiment in which no is provided. This is due to the difference in the amount of heat generated between the paper passing area and the outside paper passing area when the recording width is narrow, the recording material is continuously fed, and the temperature outside the recording material is adjusted to the Curie temperature or lower. This means that it will be larger than that of Form 1. As a result, heat generation near the Curie temperature becomes extremely small, and temperature rise outside the recording material width can be minimized.
- the nonmagnetic conductor 410 is disposed inside the heat generating roller 210a, the thickness of the high magnetic permeability conductive layer 212a can be set thinner, and the heat generating roller 210a The heat capacity can be reduced. For this reason, the fixing device 200 is warmed up. This time can be further shortened. Further, the magnetic flux force auxiliary roller 420 penetrating the heat generating roller 210a does not penetrate and be heated.
- a feature of the third embodiment of the present invention is that an exciting coil is arranged inside the heat generating roller to reduce the size of the fixing device.
- FIG. 13 is a cross-sectional view showing a configuration of fixing device 200 according to the present embodiment.
- the fixing device 200 according to the present embodiment includes a heating roller 610 and an excitation coil unit 620 instead of the heating roller 210 and the excitation coil unit 240 of the fixing device 200 according to Embodiment 1, and includes a nonmagnetic conductor 630. It has a configuration with added.
- the heat generating roller 610 is a cylindrical roller having a bottom diameter of, for example, 34 mm, and rotates around the central axis so as to convey the recording paper 109 on which the toner image 111 is formed and carried in the direction of the arrow (in FIG. Clockwise).
- the heat generating roller 610 is mainly formed by laminating a highly permeable conductive layer 612 and a nonmagnetic conductive layer 614. More specifically, as shown in FIG. 14, the Ni layer 616, the nonmagnetic conductive layer 614, the highly permeable conductive layer 612, the silicon rubber layer 618, and the mold release are arranged in order from the side closer to the central axis of the heat generating roller 610. Layer 619 is laminated. Among these layers, the highly permeable conductive layer 612, the nonmagnetic conductive layer 614, the Ni layer 616, and the release layer 619 are different in layer thickness, material, etc. according to Embodiment 1. This is the same as the highly permeable conductive layer 212, the nonmagnetic conductive layer 214, the Ni layer 216, and the release layer 218 (FIG. 3).
- exciting coil unit 620 is arranged inside heat generating roller 610, the inside and outside of highly magnetically permeable conductive layer 212 and nonmagnetic conductive layer 214 in Embodiment 1 are reversed to generate heat.
- a highly permeable conductive layer 612 is provided on the outer peripheral side of the roller 610, and the nonmagnetic conductive layer 614 is covered with an inner peripheral surface of the highly permeable conductive layer 612 by plating or the like.
- the peripheral surface of the heat generating roller 610 is elastic, and the pressure roller 220 Both rollers can be brought into close contact with each other in a nip formed between and.
- exciting coil unit 620 includes coil holding member 622, exciting coil 624, and core member 626.
- the coil holding member 622 is formed of a cylindrical insulator disposed to face the inner peripheral surface of the heat generation roller 610.
- the exciting coil 624 is formed by winding a conducting wire on the surface opposite to the surface facing the heat generating roller 610 of the coil holding member 622, and an alternating current flows when a voltage is applied from a power source (not shown). Thus, magnetic flux is generated around.
- the core member 626 is made of a magnetic material having a high magnetic permeability and specific resistance, such as ferrite and permalloy, and has a substantially T-shaped cross section. Specifically, the core member 626 is in contact with the coil holding member 622 at the center of winding of the conductive wire forming the exciting coil 624 and the outermost periphery of the winding, and has a shape that connects these portions with a plane.
- the core member 626 serves as a magnetic path for the magnetic flux generated on the side opposite to the heating roller 610 out of the magnetic flux generated by the exciting coil 624.
- the nonmagnetic conductor 630 is made of a semi-cylindrical nonmagnetic material having a thickness of, for example, 500 ⁇ m, and is disposed to face the exciting coil unit 620 with the peripheral surface of the heat roller 610 interposed therebetween.
- the heat generating roller 610 exceeds the Curie temperature, the nonmagnetic conductor 630 becomes a magnetic path of magnetic flux that penetrates the peripheral surface of the heat generating roller 610 with the skin depth deepening. Therefore, even if the thickness of the highly permeable conductive layer 612 is reduced, the surrounding members are not heated by the magnetic flux penetrating the heating roller 610. Since the heat capacity of the heat generating roller 610 is reduced, the heat generation of the heat generating roller 610 can be further promoted.
- non-magnetic conductor 630 is disposed outside heat generating roller 610
- excitation coil unit 620 larger than non-magnetic conductor 630 is disposed inside heat generating roller 610. Therefore, the fixing device 200 can be downsized.
- the highly permeable conductive layer 612 becomes nonmagnetic, and the magnetic flux penetrates this layer.
- the magnetic flux penetrating through the highly permeable conductive layer 612 permeates the non-magnetic conductor 630.
- the non-magnetic conductor 630 generates little heat, and the eddy current in the heating roller 610 Since the generation is also suppressed, the heat generation amount of the heat generating roller 610 is reduced.
- the exciting coil is provided inside the heat generating roller, and the nonmagnetic conductive layer is provided between the exciting coil and the highly permeable conductive layer of the heat generating roller.
- the warm-up time can be shortened while preventing excessive temperature rise, and the fixing device can be downsized. As a result, the image forming apparatus can be downsized.
- a feature of the fourth embodiment of the present invention is that the warm-up time is shortened while preventing an excessive temperature rise in a belt-type fixing device that transmits heat generated by the heat generating roller to the fixing roller by a belt.
- the schematic configuration of the image forming apparatus according to the present embodiment is the same as that of the first embodiment (Fig. 1), and thus the description thereof is omitted. In the present embodiment, only the configuration of the fixing device 200 is different from the first embodiment.
- FIGS. 15A and 15B are cross-sectional views showing the configuration of the fixing device 200 according to the present embodiment.
- FIG. 15 (a) shows the magnetic path of the magnetic flux M in a state below the Curie temperature
- FIG. 15 (b) shows the magnetic path of the magnetic flux M in a state exceeding the Curie temperature.
- the fixing device 200 includes a heat generating roller 710, a nonmagnetic conductor 720, a belt 730, a fixing roller 740, a caloric pressure roller 220, a temperature sensor. 230 and excitation coil unit 240.
- the heat generating roller 710 is a cylindrical roller having a bottom diameter of, for example, 20 mm, and rotates around the central axis so that the belt 730 suspended on this roller conveys the recording paper 109 in the direction of the arrow (in the figure). Counterclockwise).
- the heat generating roller 710 is mainly formed by laminating a highly permeable conductive layer 712 and a nonmagnetic conductive layer 714. More specifically, a highly permeable conductive layer 712, a nonmagnetic conductive layer 714, and a Ni layer are laminated in order from the side closer to the central axis of the heat generating roller 710.
- the highly magnetically conductive layer 712 is made of a magnetic shunt metal set so that the Curie temperature becomes a predetermined temperature, and is formed into a cylindrical shape with a thickness of, for example, 200 ⁇ .
- the highly permeable conductive layer 712 is the same as the highly permeable conductive layer 212a according to Embodiment 2 except that the diameter is different.
- the nonmagnetic conductive layer 714 is a layer having a thickness of, for example, 10 / m, in which the outer peripheral surface of the highly permeable conductive layer 712 is processed by plating, metalizing, or cladding.
- the nonmagnetic conductive layer 714 is the same as the nonmagnetic conductive layer 214 according to Embodiment 1 except that the diameter and thickness are different.
- the Ni layer is laminated on the outer peripheral surface of the nonmagnetic conductive layer 714.
- This Ni layer is the same as the Ni layer 216 according to the first embodiment. Further, in the present embodiment, the Ni layer prevents wear of the heat generating roller 710 due to contact with the benolet 730, and reduces the friction coefficient to prevent meandering and shifting of the belt 730.
- chrome, zinc, or fluorine resin can be formed as a single layer or laminated.
- the nonmagnetic conductor 720 is made of a cylindrical nonmagnetic material having a thickness of, for example, 500 ⁇ m, is formed integrally with the heat generating roller 710, and rotates around the same central axis as the heat generating roller 710.
- the material of the nonmagnetic conductor 720 for example, copper, aluminum, silver, gold, and the like can be applied in the same manner as the nonmagnetic conductor 410 of the second embodiment.
- Fig. 15 (b) when the heating port temperature 710 exceeds the Curie temperature, the skin depth increases and the magnetic flux M penetrates the heating roller 710 and enters the nonmagnetic conductor 720. To do. Thereafter, the magnetic flux M passes through the nonmagnetic conductor 720.
- the nonmagnetic conductor 720 is made of a material having a small specific resistance and is thick, so that the skin resistance is small and the heat generation is slight.
- the nonmagnetic conductor 720 is integrally formed with the heating roller 710 and rotates, the structure of the fixing device can be simplified, and further, the nonmagnetic conductor 720 can be concentrated on a part of the nonmagnetic conductor 720. Therefore, heat generation can be reliably suppressed at high temperatures without allowing magnetic flux to permeate.
- Benoleto 730 is an endless belt stretched around heat generating roller 710 and fixing roller 740, and transfers heat from heat generating roller 710 to an epoxy formed by fixing roller 740 and pressure roller 220.
- the belt 730 is made of a heat-resistant polyimide resin with a diameter of 45 mm and a thickness of 80 ⁇ m.
- the mold layer is formed to be covered. Note that the dimensions of the belt 730 are not limited to those described above.
- a base material a fluororesin or PPS is used in addition to a polyimide resin, and a conductive material powder is further dispersed in these base materials. It is also possible to use thin metals such as nickel and stainless steel manufactured by Dentsu.
- PTFE, PFA, FEP, and fluoroelastomer resin such as PTFE, PFA, FEP, and fluoro rubber can be used alone or in combination.
- the fixing roller 740 is a cylindrical roller having a bottom diameter of, for example, 30 mm. Then, the fixing roller 740 rotates around the central axis (counterclockwise in the figure) so as to convey the recording paper 109 in the direction of the arrow, following the transfer of the belt 730 by the rotation of the heat generating roller 710.
- the fixing roller 740 is formed of a material having low thermal conductivity such as silicon rubber having a hard i3 ⁇ 4ISA of 30 degrees. As the fixing roller 740, a silicone rubber foam may be used.
- the temperature of the heat generating roller 710 when the temperature of the heat generating roller 710 is equal to or lower than the Curie temperature, an alternating current flows through the exciting coil 244, and as shown in FIG. 15 (a), around the exciting coil 244. Magnetic flux M is generated.
- the generated magnetic flux M passes through the belt 730 and the nonmagnetic conductive layer 714 of the heat generating roller 710 and reaches the highly permeable conductive layer 712, and permeates near the outer peripheral surface of the highly permeable conductive layer 712 due to the skin effect.
- the nonmagnetic conductive layer 714 and the highly permeable conductive layer 712 generate heat due to Joule heat.
- the highly permeable conductive layer 712 becomes non-magnetic, and the magnetic flux M is applied to this layer as shown in FIG. 15 (b). To penetrate.
- the magnetic flux M penetrating through the highly permeable conductive layer 712 permeates the nonmagnetic conductor 720.
- the nonmagnetic conductor 720 generates little heat. The generation of eddy currents is also suppressed, so that the heat generation amount of the heat generating roller 710 is reduced.
- the heat-generating roller formed by laminating the highly permeable conductive layer and the nonmagnetic conductive layer is excited by the exciting coil, and the generated heat is nipped by the belt. Therefore, even in the belt type fixing device, it is possible to reduce the warm-up time while preventing excessive temperature rise, and to prevent the occurrence of offset and achieve good fixing performance.
- Embodiment 5 of the present invention is that, in a belt-type fixing device, the belt passing between the exciting coil and the heat generating roller has a function as a nonmagnetic conductive layer, thereby simplifying the structure of the heat generating roller. Is a point.
- FIGS. 16A and 16B are cross-sectional views showing the configuration of the fixing device 200 according to the present embodiment.
- FIG. 16 (a) the magnetic path of the magnetic flux M in a state below the Curie temperature is shown, and in FIG. 16 (b), the magnetic path of the magnetic flux M in a state exceeding the Curie temperature is shown.
- the fixing device 200 according to the present embodiment includes a heating port of the fixing device 200 according to the fourth embodiment.
- a heating roller 810, a nonmagnetic conductor 720a, and a belt 730a are provided.
- the heating roller 810 is a cylindrical roller having a bottom diameter of, for example, 20 mm, and rotates around the central axis so that the belt 730a suspended on this roller conveys the recording paper 109 in the direction of the arrow (in the figure). Counterclockwise).
- the heat generating roller 810 does not have a nonmagnetic conductive layer, and is mainly formed of only a highly magnetically conductive layer. More specifically, it has a simple configuration in which a protective layer is provided on the outer peripheral surface of a highly permeable conductive layer having a thickness of, for example, 200 ⁇ m. In this embodiment, the configuration of the heat generating roller 810 may be further simplified and may be configured without a protective layer.
- the nonmagnetic conductor 720a has a semi-cylindrical shape and does not rotate integrally with the heat roller 810.
- the nonmagnetic conductor 720a has a semi-cylindrical shape, so that the heat capacity of the nonmagnetic conductor 720a is reduced, and the amount of heat taken away from the heating roller 810 by the nonmagnetic conductor 720a is reduced. It can be kept to a minimum.
- the belt 730a is an endless belt stretched around the heating roller 810 and the fixing roller 740, and transfers the heat of the heating roller 810 to the two-ply formed by the fixing roller 740 and the pressure roller 220. As will be described later, the belt 730a itself also generates heat due to the excitation of the excitation coil unit 240.
- Benoleto 730a is based on a heat-resistant polyimide resin with a diameter of 45 mm and a thickness of 80 ⁇ m. Silver powder is dispersed in this base material, and a silicon rubber layer with a wall thickness of 150 xm and a wall thickness of 30 zm. And a release layer made of a fluororesin.
- the dimensions and materials of the belt 730a are not limited to the above, but as a base material, fluorine resin or PPS may be used in addition to polyimide resin, and instead of dispersing silver powder, copper Alternatively, a nonmagnetic high conductivity layer such as silver or gold may be formed. Alternatively, a thin metal surface such as stainless steel with a non-magnetic high conductivity layer such as copper, silver, or gold formed by plating, metalizing, or grading may be used. Further, as the release layer, resins or rubbers having good release properties such as PTFE, PFA, FEP, and fluoro rubber may be used alone or in combination.
- the belt 730a functions as a nonmagnetic conductive layer of the heating hole roller 810, the surface of the substrate or the nonmagnetic high It is necessary to disperse silver or the like, which is a conductivity material, or to form a layer.
- the heat generating roller 810 is mainly formed of only the highly magnetically conductive layer, and the belt 730a that forms a layer with the heat generating roller 8 10 is used as the nonmagnetic conductive layer within the range in which the exciting coil unit 240 is excited. Make it work. Therefore, the structure of the heat generating roller 810 can be simplified, and the belt 730a itself having a thin film and a small heat capacity generates heat, and the warm-up time can be further shortened.
- the heat generated in the belt 730a and the heat generating roller 810 is transmitted to the two nips between the fixing roller 740 and the pressure roller 220 by the belt 730a, and used for fixing the toner image 111 on the recording paper 109.
- the nonmagnetic conductor 720a generates little heat, and the generation of eddy current in the heat generating roller 810 is also suppressed, so that the heat generation amount of the heat generating roller 810 and the belt 730a is reduced.
- the heat generating roller 210 having a roller configuration is used as the heat generating means, and the belt 730 is supported by the heat generating roller 210.
- a support plate having an arc shape may be applied as the heat generating means, and the belt 730 may be supported by the support plate.
- a belt functioning as a non-magnetic conductive layer is suspended from a heat-generating roller made of a highly permeable conductive layer, and a contact portion between the heat-generating roller and the belt is excited by an excitation coinore. Therefore, the warm-up time can be shortened while preventing excessive temperature rise, and the structure of the heat generating roller can be simplified to reduce the cost.
- the fixing device includes an excitation unit that forms a magnetic field around a voltage applied thereto, and at least a part thereof is disposed in a magnetic field formed by the excitation unit.
- a magnetically permeable conductive layer made of a magnetic shunt material that has predetermined magnetism at normal temperature and loses magnetism when the temperature exceeds a predetermined temperature; and a nonmagnetic conductive layer laminated on the exciting means side of the magnetically permeable conductive layer. The structure which has is taken.
- the magnetically permeable conductive layer is used alone at a low temperature below the Curie temperature.
- the magnetic coupling is better than exciting and heat generation is promoted, and when the part outside the width of the recording material becomes high near the Curie temperature, the magnetically permeable conductive layer is excited alone. Rather, the heat generation in this part is reduced. Therefore, it is possible to shorten the warm-up time while preventing excessive temperature rise in the fixing device, and to realize good fixing performance by preventing the occurrence of offset, damage to the rubber member, and life deterioration.
- the fixing device is the heating device according to the first aspect. Is made of a non-magnetic material, and further includes a non-magnetic conductor facing the exciting means with the non-magnetic conductive layer sandwiched between the non-magnetic conductive layer, and the permeable conductive layer has a temperature at which no magnetism is present. In this case, a configuration is adopted in which the magnetic flux penetrates and reaches a thickness of the nonmagnetic conductor.
- the thickness of the magnetically permeable conductive layer can be reduced, the heat capacity can be reduced, and the warm-up time at low temperatures can be shortened.
- the magnetic flux penetrates the magnetically permeable conductive layer and reaches the nonmagnetic conductor at a high temperature equal to or higher than the Curie temperature, an eddy current flows through the nonmagnetic conductor in the direction of decreasing the magnetic flux M, and the permeable conductive layer Heat generation can be suppressed and overheating can be prevented.
- the nonmagnetic conductor is configured to partially face the excitation means.
- the heat generating means includes: a rotating cylindrical permeable conductive layer; and the exciting means side of the permeable conductive layer.
- the non-magnetic conductive layer that is laminated on the surface of the magnetically conductive layer and rotates integrally with the magnetically permeable conductive layer, and a heating roller that is powerful are adopted.
- the permeable conductive layer and the non-permeable conductive layer are formed on the peripheral surface of the heat generating roller, and the non-permeable conductive layer is formed on the excitation means side of the permeable conductive layer.
- the heat generating means further includes a non-magnetic conductor facing the exciting means across the circumferential surface of the heat generating roller.
- the heat generating roller has a structure in which the magnetic flux penetrates the peripheral surface to reach the nonmagnetic conductor at a temperature at which the magnetic permeability of the magnetically permeable conductive layer disappears.
- the magnetic flux penetrates the peripheral surface of the heat generating roller when the temperature is higher than the Curie temperature.
- the non-magnetic conductor that does not easily generate heat is reached, so that the heat generation of the heating roller can be suppressed and excessive temperature rise can be prevented.
- the thickness of the peripheral surface of the heat generating roller can be reduced, and the heat capacity can be reduced to promote heat generation at low temperatures.
- the non-magnetic conductor is formed along a peripheral surface of the heat-generating roller and is in a range facing the exciting means. The construction is drawn only at
- the nonmagnetic conductor is formed in a cylindrical shape along a peripheral surface of the heat generating roller, A structure that rotates integrally is adopted.
- the nonmagnetic conductor is formed in a cylindrical shape along the peripheral surface of the heat generating roller and rotates integrally, it is possible to simplify the structure of the fixing device and It is possible to suppress heat generation reliably at high temperatures where magnetic flux does not penetrate through concentrated magnetic conductors.
- the fixing device is the fixing device according to the fourth aspect, wherein the exciting means includes an exciting coil disposed to face the outer peripheral surface of the heat generating roller, The structure is used to excite the laser from the outside.
- the fixing device is the fixing device according to the fourth aspect, wherein the exciting means includes an exciting coil disposed to face an inner peripheral surface of the heat generating roller, Adopts a configuration to excite the roller from the inside.
- the exciting coil is arranged inside the heat generating roller, the fixing device can be downsized.
- the fixing device is the fixing device according to the first aspect, wherein the heat generating means is suspended from a rotating cylindrical heat generating roller and the heat generating roller.
- the structure linked to the rotation of the magnetically permeable conductive layer is employed.
- the magnetically permeable conductive layer is formed on the peripheral surface of the heat generating roller, and the non-magnetic conductive layer is formed on the belt suspended from the heat generating roller.
- the belt itself generates heat with a thin film and a small heat capacity. Therefore, it is possible to accelerate the heat generation and further shorten the warm-up time.
- the heat generating unit further includes a protective layer laminated on the exciting means side of the nonmagnetic conductive layer. Adopt the composition.
- the nonmagnetic conductive layer has a thickness of 2 ⁇ m to 30 ⁇ m.
- the resistance of the nonmagnetic conductive layer is optimized, and the amount of heat generation is increased.
- fixing device in the first aspect, the non-magnetic conductive layer, the resistivity takes a configuration which is less metallic material 10 X 10- 6 ⁇ cm.
- the excitation means adopts a configuration in which a current having a frequency of 20 kHz to 100 kHz is applied.
- the magnetically permeable conductive layer has a thickness of 0.3 mm to lmm.
- the magnetically permeable conductive layer has a thickness of 0.1 mm to 0.5 mm.
- the heat capacity of the magnetically permeable conductive layer can be further reduced, and the warm-up time can be further shortened.
- the nonmagnetic conductor has a thickness of 0.2 mm to 2 mm.
- An image forming apparatus employs a configuration having the fixing device according to any one of the first to seventeenth aspects.
- the heat generating roller according to the nineteenth aspect of the present invention is a heat generating roller that is disposed in the magnetic field formed by the excitation means and generates heat by permeating the magnetic flux generated in the magnetic field into the interior.
- a magnetically permeable conductive layer made of a magnetic shunt material that has a predetermined magnetic property and loses its magnetic property when a predetermined temperature is exceeded, and a nonmagnetic conductive layer laminated on the exciting means side of the magnetically permeable conductive layer. Take the configuration.
- the magnetically permeable conductive layer is used alone at a low temperature below the Curie temperature.
- the magnetic coupling is better than exciting and heat generation is promoted, and when the part outside the width of the recording material becomes high near the Curie temperature, the magnetically permeable conductive layer is excited alone. Rather, the heat generation in this part is reduced. Therefore, it is possible to shorten the warm-up time while preventing excessive temperature rise in the fixing device provided with the heat generating roller, and to realize good fixing performance by preventing the occurrence of offset, the damage of the rubber member and the life deterioration. it can.
- the heat generating roller according to the twentieth aspect of the present invention is the heating roller according to the nineteenth aspect, wherein the protective layer is laminated on the excitation means side of the non-magnetic conductive layer, and the excitation means side of the protection layer. And a release layer laminated on the substrate.
- the fixing device can reduce the warm-up time while preventing excessive temperature rise, and can prevent the occurrence of offset to realize good fixing performance.
- the electromagnetic induction heating method Therefore, it is useful for a fixing device that heats and fixes an unfixed image on a recording material.
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- General Induction Heating (AREA)
Abstract
Description
Claims
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JP2006529322A JP4403180B2 (ja) | 2004-07-26 | 2005-07-25 | 定着装置、および画像形成装置 |
US11/572,521 US7486923B2 (en) | 2004-07-26 | 2005-07-26 | Heat generating roller, fixing equipment, and image forming apparatus |
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JP2004217663 | 2004-07-26 | ||
JP2004-217663 | 2004-07-26 |
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US (1) | US7486923B2 (ja) |
JP (1) | JP4403180B2 (ja) |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07114276A (ja) * | 1993-10-18 | 1995-05-02 | Canon Inc | 像加熱装置 |
JP2001125407A (ja) * | 1999-10-27 | 2001-05-11 | Matsushita Electric Ind Co Ltd | 像加熱装置および画像形成装置 |
JP2004151470A (ja) * | 2002-10-31 | 2004-05-27 | Konica Minolta Holdings Inc | 誘導加熱定着装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2002056961A (ja) * | 2000-08-11 | 2002-02-22 | Canon Inc | 加熱装置および画像形成装置 |
JP4077410B2 (ja) * | 2001-11-14 | 2008-04-16 | 松下電器産業株式会社 | 加熱ローラ、加熱ベルト、像加熱装置および画像形成装置 |
JP2003223063A (ja) * | 2002-01-30 | 2003-08-08 | Matsushita Electric Ind Co Ltd | 定着装置 |
US7239836B2 (en) * | 2002-08-23 | 2007-07-03 | Kyocera Mita Corporation | Fixing apparatus |
WO2004063820A1 (ja) | 2003-01-14 | 2004-07-29 | Matsushita Electric Industrial Co., Ltd. | 像加熱装置及び画像形成装置 |
US7391983B2 (en) | 2003-07-30 | 2008-06-24 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for controlling image forming operation of an image forming apparatus |
-
2005
- 2005-07-25 CN CNB200580025074XA patent/CN100517117C/zh not_active Expired - Fee Related
- 2005-07-25 WO PCT/JP2005/013593 patent/WO2006011454A1/ja active Application Filing
- 2005-07-25 JP JP2006529322A patent/JP4403180B2/ja not_active Expired - Fee Related
- 2005-07-26 US US11/572,521 patent/US7486923B2/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07114276A (ja) * | 1993-10-18 | 1995-05-02 | Canon Inc | 像加熱装置 |
JP2001125407A (ja) * | 1999-10-27 | 2001-05-11 | Matsushita Electric Ind Co Ltd | 像加熱装置および画像形成装置 |
JP2004151470A (ja) * | 2002-10-31 | 2004-05-27 | Konica Minolta Holdings Inc | 誘導加熱定着装置 |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011221557A (ja) * | 2006-03-17 | 2011-11-04 | Ricoh Co Ltd | 定着装置及び画像形成装置 |
JP2007272073A (ja) * | 2006-03-31 | 2007-10-18 | Kyocera Mita Corp | 定着装置および画像形成装置 |
US8116670B2 (en) * | 2006-11-14 | 2012-02-14 | Ricoh Company, Ltd. | Fixing device and image forming apparatus using the same |
JP2008129517A (ja) * | 2006-11-24 | 2008-06-05 | Fuji Xerox Co Ltd | 定着装置、及び画像形成装置 |
US7647017B2 (en) | 2006-11-24 | 2010-01-12 | Fuji Xerox Co., Ltd. | Fixing device and image-forming apparatus |
CN101187797B (zh) * | 2006-11-24 | 2011-10-19 | 富士施乐株式会社 | 定影装置和图像形成装置 |
JP2008216390A (ja) * | 2007-02-28 | 2008-09-18 | Ricoh Co Ltd | 定着装置及び画像形成装置 |
CN101266446B (zh) * | 2007-03-12 | 2012-07-11 | 株式会社理光 | 定影装置及使用该定影装置的图像形成装置和定影方法 |
JP2009152041A (ja) * | 2007-12-20 | 2009-07-09 | Konica Minolta Business Technologies Inc | 誘導加熱装置,定着装置および画像形成装置 |
JP2013003511A (ja) * | 2011-06-21 | 2013-01-07 | Ricoh Co Ltd | 定着装置及びこれを備えた画像形成装置 |
JP2015111237A (ja) * | 2013-11-01 | 2015-06-18 | 株式会社リコー | 定着装置および画像形成装置 |
Also Published As
Publication number | Publication date |
---|---|
US7486923B2 (en) | 2009-02-03 |
CN100517117C (zh) | 2009-07-22 |
JPWO2006011454A1 (ja) | 2008-05-01 |
JP4403180B2 (ja) | 2010-01-20 |
US20080063445A1 (en) | 2008-03-13 |
CN1989461A (zh) | 2007-06-27 |
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