JP4801924B2 - Induction coil cooling device and image heating device - Google Patents

Description

  The present invention relates to a cooling device for cooling an induction coil and an image heating device using the induction coil in an induction heating type image heating device.

  2. Description of the Related Art Conventionally, there is a fixing device having an induction coil as one of induction heating type image heating devices. In this fixing device, the induction coil unit is disposed close to the heating roller, and the entire induction coil unit is covered with a cover from the viewpoint of safety and heating efficiency. The coil temperature of the induction coil rises due to the radiant heat from the heating roller and self-heating of the induction coil. However, since the entire unit is covered with a cover, the heat dissipation efficiency is low, and the coil temperature may exceed the coating heat resistance temperature. is there. If the coil temperature exceeds the coating heat resistance temperature, the device may be damaged. Therefore, a coil cooling fan is provided and cooling air is sent into the cover from one side in the coil longitudinal direction.

However, when the induction coil is cooled from one side, the front side of the blower is particularly cooled and the rear side of the blower is not sufficiently cooled, which causes fixing unevenness due to temperature unevenness. Conventionally, in order to suppress such temperature unevenness, cooling fans are arranged at both ends of the heating roller in the axial direction, and during the period when one cooling fan is rotated forward for blowing, the other cooling fan is sucked out. It is proposed to perform drive control such as normal rotation (see, for example, Patent Document 1).
JP 2002-72764 A

  However, if the cooling fans are arranged at both ends of the heating roller in the axial direction, the installation space is increased due to the increase in the number of cooling fans, which causes a problem in downsizing the apparatus.

  The present invention has been made in view of the circumstances as described above, and has a structure in which cooling air is sent into the cover from one side in the longitudinal direction of the coil without adding a cooling fan. It is an object of the present invention to provide an induction coil cooling device and an image heating device that can reduce the temperature difference between the induction coil and the fixing coil, and can suppress fixing failure due to uneven cooling of the induction coil and realize space saving.

The present invention includes a coil fixing frame in which an induction coil is fixed to an outer peripheral surface disposed along a roller axial direction adjacent to a heating roller, and the coil attached to the coil fixing frame so as to cover the induction coil. A cover that forms a blowing path that opens at both ends in the roller axial direction between the fixed frame and a duct that feeds air from the axial end of the heating roller that is the upstream end in the blowing direction with respect to the blowing path And the cross-sectional area of the air flow direction downstream end portion in the air flow path is larger than the air flow direction upstream end portion in the air flow path, and the air flow direction is fed from the duct to the air flow direction upstream end portion of the air flow path. cooling arrangement of the induction coil where the air is provided deflectors for adjusting the wind direction as guided more by the route upper side than the path the lower part of the air blowing path for Take.

According to the present invention, since it is only necessary to form the air flow path along the roller axis direction which is the longitudinal direction of the induction coil and to blow air from one side of the air flow path, it is not necessary to install cooling fans on both sides of the apparatus, thereby reducing the cost. As well as space saving. Moreover, since the cross-sectional area of the air flow direction downstream end is larger than the air flow direction upstream end, the heat accumulated on the air flow direction downstream side of the air flow path can be easily discharged outside the apparatus, The temperature difference with the downstream side is reduced to reduce the temperature unevenness of the induction coil, and the air sent from the duct can be guided more to the upper side of the air path than to the lower side of the air path. The warm air gathered at the upper part can escape with stronger air than the lower part, and the cooling effect can be improved .

According to a first aspect of the present invention, there is provided a coil fixing frame in which an induction coil is fixed to an outer peripheral surface disposed along the roller axial direction adjacent to the heating roller, and the coil fixing frame so as to cover the induction coil. A cover that forms a ventilation path that opens at both ends in the axial direction of the roller between the coil fixing frame and the coil fixing frame, and an axial end of the heating roller that is an upstream end in the blowing direction with respect to the ventilation path A duct for feeding more air, and a larger cross-sectional area of the downstream end in the blowing direction in the blowing path than the upstream end in the blowing direction in the blowing path, and an upstream end in the blowing direction of the blowing path induction carp air fed from the duct is provided with a wind direction adjustment member for adjusting the wind direction as guided more by the route upper side than the path the lower part of the air blowing path Take a cooling configuration of.

According to this configuration, it is only necessary to form a blower path along the roller axis direction, which is the longitudinal direction of the induction coil, and to blow air from one side of the blower path. As well as space saving. Moreover, since the cross-sectional area of the air flow direction downstream end is larger than the air flow direction upstream end, the heat accumulated on the air flow direction downstream side of the air flow path can be easily discharged outside the apparatus, The temperature difference with the downstream side is reduced to reduce the temperature unevenness of the induction coil, and the air sent from the duct can be guided more to the upper side of the air path than to the lower side of the air path. The warm air gathered at the upper part can escape with stronger air than the lower part, and the cooling effect can be improved .

The second aspect of the present invention constitutes an image heating apparatus including an induction coil unit having the induction coil cooling apparatus of the first aspect.

  According to this configuration, it is only necessary to form the air flow path along the roller axis direction which is the longitudinal direction of the induction coil and to blow air from one side of the air flow path. The cost of the heating device can be reduced and space can be saved. Moreover, since the cross-sectional area of the air flow direction downstream end is larger than the air flow direction upstream end, the heat accumulated on the air flow direction downstream side of the air flow path can be easily discharged outside the apparatus, It is possible to provide an image heating apparatus that reduces the temperature difference from the downstream side and suppresses temperature unevenness of the induction coil.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view of the image forming apparatus according to the present embodiment.

  In the image forming apparatus 100, a plurality of paper feed cassettes 101a to 101d that store recording paper are disposed near the bottom surface. The paper feed cassettes 101a to 101d are configured to be detachable from the front direction to the back direction in the figure. The paper feed cassettes 101a to 101d can store recording sheets of different sizes. Bottom plates 102a to 102d are provided at the inner bottoms of the paper feed cassettes 101a to 101d, with the rear ends in the insertion direction of the paper feed cassettes 101a to 101d as axes. At one end of the bottom plates 102a to 102d, the leading end in the insertion direction of the paper feed cassettes 101a to 101d is lifted upward by a spring (not shown) to lift the arranged recording paper. Then, the bottom plates 102a to 102d press the recording paper disposed on the uppermost layer against paper feed rollers 103a to 103d located above the front end in the insertion direction of the paper feed cassettes 101a to 101d.

  The paper feed rollers 103a to 103d are rotated counterclockwise by a driving unit (not shown) and conveyed to a pair of conveyance rollers 104a to 104d disposed downstream in the conveyance direction of the recording paper, and the conveyance rollers 104a to 104d are recording paper. Is fed to the conveyance path 105 inside the apparatus. The conveyance path 105 is formed from the lower side to the upper side of the insertion direction side of the paper feed cassettes 101 a to 101 d of the image forming apparatus 100.

  A pair of transport rollers 106 a to 106 d are provided in the vicinity of the insertion direction side of the paper feed cassettes 101 a to 101 d on the transport path 105. The recording paper conveyed to the conveyance path 105 from the paper cassettes 101a to 101c is conveyed upward in the order of the conveyance rollers 106a, 106b, 106c, and 106d.

  A manual feed tray 107 is provided on the right side of the image forming apparatus 100. On the upper side of the manual feed tray 107, a placement surface 108 on which recording paper is placed is provided. The leading edge of the recording paper placed on the placement surface 108 is conveyed to the transport roller 106d of the transport path 105 by a pair of paper feed rollers 109 provided in the vicinity of the portion where the manual feed tray 107 of the image forming apparatus 100 is mounted. It is.

  The transport roller 106 d transports the transported recording paper to a pair of registration rollers 110 disposed downstream of the transport path 105. The registration roller 110 adjusts the conveyance of the recording paper so that the leading edge position of the recording paper matches the leading edge position of an image formed on a transfer belt described later.

  On the other hand, an image forming unit 111 is disposed above these sheet feeding mechanisms. The image forming unit 111 includes four color image forming units 112Y, 112M, 112C, and 112K of yellow, magenta, cyan, and black. The image forming units 112Y, 112M, 112C, and 112K are provided with photoreceptors 113Y, 113M, 113C, and 113K in order from the left to the right.

  The photoreceptors 113Y, 113M, 113C, and 113K are rotated in a predetermined direction at a predetermined timing by a drive system (not shown), and the surfaces are sequentially charged to a predetermined potential by a charging roller (not shown). The surfaces of the photoconductors 113Y, 113M, 113C, and 113K are sequentially exposed by the laser beams LY, LM, LC, and LK emitted from the laser scan unit 114. Thereby, electrostatic latent images of the respective colors are formed on the surfaces of the photoconductors 113Y, 113M, 113C, and 113K.

  Each color electrostatic latent image formed on the surface of each of the photoconductors 113Y, 113M, 113C, and 113K is individually composed of yellow (Y), magenta (M), cyan (C), and black (K) toners. The four-color toner images are respectively developed by sequentially developing with four-layer toners of yellow, magenta, cyan, and black supplied from the accommodated toner bottles 115Y, 115M, 115C, and 115K.

  Above the photoreceptors 113Y, 113M, 113C, and 113K, an endless transfer belt 116 as an image receiving unit is wound around belt rollers 117a and 117b. Further, the transfer belt 116 is disposed so as to contact the photoconductors 113Y, 113M, 113C, and 113K.

  Further, a predetermined voltage is applied between the photoconductors 113Y, 113M, 113C, and 113K at positions inside the transfer belt 116 and facing the photoconductors 113Y, 113M, 113C, and 113K, respectively. Primary transfer rollers 118Y, 118M, 118C, and 118K, which are potential applying means for forming an electric field, are provided. In other words, the photoreceptors 113Y, 113M, 113C, and 113K and the primary transfer rollers 118Y, 118M, 118C, and 118K are opposed to each other with the transfer belt 116 therebetween.

  The four color toner images formed on the surfaces of the photoreceptors 113Y, 113M, 113C, and 113K are sequentially superimposed on the transfer belt 116 by the primary transfer rollers 118Y, 118M, 118C, and 118K inside the rotating transfer belt 116. Transcribed. As a result, a full-color image is formed on the surface of the transfer belt 116.

  The full-color image primarily transferred onto the transfer belt 116 is sent to the recording paper conveyance path 105 side by belt rollers 117a and 117b.

  At a position facing the belt roller 117b on the conveyance path 105 side, a secondary transfer roller 119 is provided with the transfer belt 116 interposed therebetween. The full-color image formed on the secondary transfer roller 119 and the transfer belt 116 is transferred to the recording paper sent from the registration roller 110. Specifically, the toner constituting the full-color image on the transfer belt 116 is electrically drawn to the secondary transfer roller 119 side, and the full-color image is transferred to the recording paper. Then, the secondary transfer roller 119 and the transfer belt 116 send the recording paper on which the full-color image is recorded to the fixing roller 120 and the pressure roller 121 provided downstream of the conveyance path 105.

  The fixing roller 120 is disposed so as to face the outer peripheral surface of the heating roller 142 with the fixing belt 141 interposed therebetween. The fixing belt 141 and the heating roller 142 are heated by electromagnetic induction by the image heating device 200 provided in the vicinity. The fixing roller 120 and the pressure roller 121 press and rotate the recording paper sent to each other, thereby pressing the recording surface while applying heat to fix the full color image on the recording paper. The recording paper on which the full-color image is formed in this way is sequentially conveyed by the conveying rollers 122, 123, 124, and 125, and is discharged to the recording paper receiver 135 outside the apparatus. The fixing roller 120, the pressure roller 121, the fixing belt 141, the heating roller 142, and the image heating device 200 constitute a fixing device 400.

  On the other hand, when performing double-sided printing on recording paper, when the recording paper is transported to the transport rollers 124 and 125, the transport rollers 124 and 125 rotate in the reverse direction so that the recording paper enters the entrance of the transport path 134 for double-sided printing. It is sent to the arranged conveying roller 126. The recording paper sent to the transport roller 126 is sequentially transported by the transport rollers 127 to 130 located downstream in the transport direction of the transport roller 126 and then sent to the registration roller 110. The conveyed recording paper forms an image on the side opposite to the surface on which the full-color image is formed by the secondary transfer roller 119 and the transfer belt 116.

  Next, the configuration of the fixing device 400 will be described with reference to FIGS. FIG. 2 is an external perspective view showing the configuration of the image heating device 200, the heating roller 142 and the fixing roller 120, and their peripheral members that constitute the fixing device 400. FIG. 3 is an external perspective view showing the configuration of the fixing device 400 when the fixing device cover 240 of FIG. 2 is removed. FIG. 4 is a side view showing the configuration of the fixing device 400 from above in FIG.

  As shown in FIGS. 2 to 4, the image heating apparatus 200 is configured to supply cooling air to a coil unit 220 that houses an induction coil 300 (see FIG. 6), which will be described later, and a ventilation path 222 a (see FIG. 4) in the coil unit 220. It is comprised from the ventilation unit 230 which ventilates. As shown in FIG. 2, a fixing device cover 240 is attached to the outside of the portion where the fixing roller 120 is accommodated.

  The coil unit 220 is adjacent to the heating roller 142 and has a coil fixing frame 221 in which the induction coil 300 is fixed to the outer peripheral surface disposed along the roller axial direction, and the coil fixing frame 221 so as to cover the induction coil 300. And a cover 222 that forms a ventilation path 222a (see FIG. 4) that opens at both ends in the roller axial direction between the coil fixing frame 221 and the coil fixing frame 221.

  In the present embodiment, the end portions on the side where the cooling air is introduced from the air blowing unit 230 are referred to as the air passage upstream side end portions, and the end portions on the side where the cooling air is exhausted. Is referred to as the air flow path downstream end.

  As shown in FIGS. 2 and 3, the blower unit 230 includes a cooling fan 231 and a duct 232 that guides the cooling air generated by the cooling fan 231 to the blower path 222 a in the coil unit 220. As shown in FIGS. 3 and 4, the duct 232 is attached so that the air introduction part 232 a faces the cooling air leakage prevention band 250 attached to the opening of the coil unit 220 on the upstream side of the air flow path. ing.

  The cooling air leakage prevention band 250 is provided to prevent the cooling air introduced from the air introduction part 232a of the duct 232 to the opening at the upstream end of the air flow path from leaking to the surroundings from the opening. is there.

  In the air blowing path 222a formed between the coil fixing frame 221 and the cover 222, the coil unit 220 of the present embodiment has a larger cross-sectional area at the air flow path downstream end than the air flow path upstream end. In addition, the air passage 222a is configured such that the upper portion of the route that is the upper side during installation is larger than the cross-sectional area of the lower portion of the route that is the lower side. The shape of the both ends of these ventilation paths 222a is demonstrated with reference to FIG.

  5A is a side view of the air blowing path 222a of the coil unit 220 as seen from the upstream end of the air blowing path, and FIG. 5B is a side view of the air blowing path 222a as seen from the downstream end of the air blowing path. . 5A and 5B, the upper side in the figure is the upper side when the image forming apparatus 100 on which the image heating apparatus 200 is mounted (hereinafter referred to as installation).

  As shown in FIGS. 5A and 5B, the coil fixing frame 221 has a surface facing the heating roller 142 so as to cover the heating roller 142 and support the induction coil 300 along the axial direction of the roller. The coil support member 221a is formed in a curved shape, and cover support members 221b and 221c that are provided at both ends of the coil support member 221a in the roller axial direction and support both ends of the air blowing path of the cover 222 are configured.

  As shown in FIGS. 2 and 3, the cover 222 is attached to the coil fixing frame 221 so as to cover the induction coil 300. Further, as shown in FIGS. 5A and 5B, the cover 222 forms a ventilation path 222 a that opens at both ends in the roller axial direction of the heating roller 142 between the coil fixing frame 221 and the coil 222.

  As shown to Fig.5 (a), in the ventilation path upstream end part of the ventilation path 222a, the surface facing the cover 222 of the cover support member 221b is formed in parallel. In contrast, as shown in FIG. 5 (b), the surface of the cover support member 221c that faces the cover 222 at the downstream end portion of the air supply path 222a is located on the upper path portion during installation and during installation. A step is formed so that the lower path portion is lower than the central portion of the surface.

  By providing the cover support member 221c at the downstream end of the air flow path in this way, as shown in FIG. 5B, the air flow path downstream side end as compared with the cross-sectional area of the air outlet at the air flow path upstream end. The cross-sectional area of the exhaust port of the portion is enlarged by the amount indicated by “C” and “D” indicated by broken lines in the drawing.

  5A and the downstream end of the air passage 222a shown in FIG. 5B, the shape of the cover 222 is set upward at the time of installation. The upper surface and the lower surface that is lower when installed are formed so as to be inclined with respect to the horizontal direction in the figure. The upper surface has an inclination angle smaller than that of the lower surface.

  Thus, by making the upper surface inclination angle and the lower surface inclination angle different at the air flow path upstream end and air flow path downstream end, as shown by the broken line in FIG. The cross-sectional area “A” of the path is larger than the cross-sectional area “B” of the lower path which is the lower side during installation.

  By forming both end portions of the air blowing path 222a with the coil fixing frame 221 and the cover 222 as described above, the cross-sectional area of the air flow path downstream end is larger than the cross-sectional area of the air flow path upstream end.

  Next, the configuration in the coil fixing frame 221 will be described with reference to FIG. FIG. 6 is a plan view showing an internal configuration when the cover 222 is removed from the coil fixing frame 221.

  As shown in FIG. 6, an induction coil 300 is wound around the coil support member 221a. The induction coil 300 is configured by alternately winding a single long coil wire whose surface is insulated along the coil support member 221a in the roller axial direction of the heating roller 142. The length of the winding portion of the induction coil 300 is set to be approximately the same length as the area where the fixing belt 141 and the heating roller 142 are in contact with each other.

  In the roller axial direction of the induction coil 300, as shown in FIG. 6, a plurality of arch cores 301 are provided at predetermined intervals so as to surround the induction coil 300. A center core 302 is provided at the center of the induction coil 300 in the drawing, and a connecting core 303 is provided at both left and right ends of the induction coil 300 in the drawing. The arch core 301, the center core 302, and the connecting core 303 increase the inductance of the induction coil 300 and improve the electromagnetic coupling between the induction coil 300 and the heating roller 142.

  In addition, a wind direction adjusting fin 310 is attached to the upstream end of the airflow path of the coil support member 221a. The direction of the wind direction of the fin 310 is adjusted when the fin 310 is assembled to the coil support member 221a. As shown in FIG. 6, the fin 310 is adjusted in wind direction so that the cooling air introduced from the duct 232 of the blower unit 230 flows more in the upper path which is the upper side when installed in the figure.

  As described above, in the image heating apparatus 200, as shown in FIGS. 5A and 5B, both ends of the air passage 222a are formed by the coil fixing frame 221 and the cover 222, and the air passage downstream end. Is larger than the cross-sectional area of the upstream end of the air flow path, and the cross-sectional area of the upper path that is the upper side during installation is larger than the cross-sectional area of the lower path that is the lower side during installation. Moreover, the fin 310 for wind direction adjustment is attached to the air flow path upstream end part of the coil support member 221a, and the cooling air introduce | transduced from the duct 232 of the air blower unit 230 flows a lot to the upper path which becomes an upper side at the time of installation. The wind direction was adjusted.

  Next, the cooling effect of the induction coil 300 in the image heating apparatus 200 of the present embodiment and the cooling effect of the induction coil in the conventional image heating apparatus will be described with reference to the characteristic diagram shown in FIG.

  In the characteristic diagram of FIG. 7, the horizontal axis indicates the temperature measurement position (front (air outlet), center, back (exhaust port)) in the air flow path, and the vertical axis indicates the litz wire temperature as the measured temperature. Yes. In this characteristic diagram, the marks “■” and “▲” connected by solid lines were measured on the upper and lower sides of the conventional image heating apparatus before taking measures against the air blowing path as described above. Indicates litz wire temperature. In addition, marks “■” and “▲” connected by broken lines indicate the upper side and the lower side of the image heating apparatus 200 according to the present embodiment after the measures for the air flow path are taken. Indicates the measured litz wire temperature.

  As is clear from this characteristic diagram, the temperature difference between the upper litz wire temperature and the lower litz wire temperature of the conventional blower path becomes large over the entire blower path, and the upper temperature rise becomes remarkable. ing. This indicates that the cooling effect of the induction coil is not good over the entire blowing path.

  In contrast, the temperature difference between the upper litz wire temperature and the lower litz wire temperature of the present embodiment is smaller over the entire air passage, and the temperature rise on the upper side is suppressed compared to the conventional case. Has been. This has shown that the cooling effect of an induction coil is favorable over the whole ventilation path.

  As described above, in the image heating apparatus according to the present embodiment, the shape of each cover support member provided at both ends in the roller axial direction of the coil fixing frame is different from the shape of both ends in the roller axial direction of the cover, so By providing fins for adjusting the wind direction at the upstream end, the cross-sectional area of the downstream end of the air flow path is made larger than the cross-sectional area of the upstream end of the air flow path, and cooling air is supplied to the upper path during installation. The cooling effect of the induction coil was improved by increasing the flow of heat and promoting the exhaust heat of the upper path during installation, where the heat of the induction coil tends to accumulate.

  Therefore, it is only necessary to form the air flow path along the roller axis direction, which is the longitudinal direction of the induction coil, and to blow air from one side of the air flow path. Space can be achieved. Moreover, since the cross-sectional area of the air flow direction downstream end is larger than the air flow direction upstream end, the heat accumulated on the air flow direction downstream side of the air flow path can be easily discharged outside the apparatus, The effect of suppressing the temperature unevenness of the induction coil by reducing the temperature difference from the downstream side can be achieved.

  In addition, the upper side of the air passage in the air passage is larger than the cross-sectional area of the lower portion of the air passage. It becomes possible to heat, and the temperature difference between the upstream side and the downstream side in the air blowing path can be reduced.

  Further, since the fin for adjusting the air direction is provided at the upstream side end of the air blowing direction in the air blowing path, the cooling air sent from the duct can be guided more to the upper side of the air path than to the lower side of the air path, and the air flow path by convection The warm air gathered at the top of the can be escaped with cooling air stronger than the bottom, and the cooling effect can be improved.

  In the above embodiment, the shape of each cover support member provided at both ends of the coil fixing frame in the roller axial direction is different from the shape of both ends of the cover in the roller axial direction so that the end of the downstream end of the airflow path is cut off. Although the case where the area is made larger than the cross-sectional area of the end portion on the upstream side of the blowing path is shown, the shape of these members is not limited.

  For example, the surface along the roller axial direction of the cover is formed so as to expand from the upstream end portion of the air passage toward the downstream end portion of the air passage, and the cross-sectional area of the downstream end portion of the air passage is formed on the upstream side of the air passage You may make it make it larger than the cross-sectional area of an edge part.

  Although the present invention is configured to send cooling air into the cover from one side in the longitudinal direction of the coil without adding a cooling fan, the temperature difference between the intake port side and the exhaust port side can be reduced, resulting in uneven cooling of the induction coil. Since the induction coil cooling structure can suppress fixing failure, the image heating apparatus can be saved in space, and can be applied to image forming apparatuses such as facsimiles and printers.

1 is a diagram showing an internal configuration of an image forming apparatus according to an embodiment of the present invention. External perspective view of fixing device according to the present embodiment FIG. 3 is an external perspective view showing the configuration of the fixing device when the fixing device cover according to the present embodiment is removed. 3 is a side view showing the configuration of the fixing device as viewed from above in FIG. 3 according to the present embodiment. (A) which concerns on this Embodiment is a side view which shows the structure of a ventilation path upstream edge part, (b) is a side view which shows the structure of a ventilation path downstream edge part The top view which shows the structure in the coil unit at the time of removing the cover which concerns on this Embodiment The characteristic diagram which shows the cooling effect of the induction coil before the countermeasure (conventional) which concerns on this Embodiment, and the cooling effect of the induction coil after a countermeasure (this plan)

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Image forming apparatus 120 Fixing roller 121 Pressure roller 141 Fixing belt 142 Heating roller 200 Image heating device 220 Coil unit 221 Coil fixing frame 222 Cover 230 Air blow unit 231 Cooling fan 232 Duct 250 Cooling air leakage prevention band 300 Induction coil

Claims (2)

A coil fixing frame in which an induction coil is fixed to an outer peripheral surface disposed along the roller axial direction adjacent to the heating roller, and the coil fixing frame attached to the coil fixing frame so as to cover the induction coil. A cover that forms an air passage that opens at both ends in the roller axial direction, and a duct that feeds air from the axial end of the heating roller that is the upstream end of the air passage with respect to the air passage. The cross-sectional area of the air flow direction downstream end of the air flow path is larger than the air flow direction upstream end of the air flow path, and the air sent from the duct to the air flow direction upstream end of the air flow path is cold induction coil, characterized in that a wind direction adjusting member that adjusts the air direction as much guided by path upper side than the path the lower part of the air feed path Apparatus. An image heating apparatus, characterized in that it comprises an induction coil unit with a cooling device of the induction coil of claim 1 Symbol placement.

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