JP2009020178A - Image forming apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technique of stably supplying power from an electric double-layer capacitor, in an image forming apparatus having the electric double-layer capacitor as a power supply source. <P>SOLUTION: The image forming apparatus 1 is configured to include a power supply section 30 which has an electric double-layer capacitor section 31 and supplies the power to each section of the image forming apparatus through the electric double-layer capacitor section 31 and heats the electric double-layer capacitor section 31 by a fixing section 22 for thermally fixing an image formed on a paper. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an image forming apparatus.

  Conventionally, an image forming apparatus using a capacitor as a power supply source is known. For example, in an image forming apparatus such as a laser printer or a copying machine, each functional unit such as a writing unit that develops a toner image on a photosensitive drum and a fixing unit that thermally fixes a toner image transferred onto paper. There is one that supplies electric power from a capacitor.

  The capacitor described above has a characteristic that the internal impedance is higher when the temperature is lower. For example, at 0 ° C, there is about twice the impedance at 20 ° C. For this reason, when power is supplied using a capacitor, there is a problem that the voltage drop increases as the current at the time of power supply increases, and a sufficient output cannot be obtained and the power loss increases.

To deal with such a problem, for example, Patent Document 1 discloses a technique for controlling the charging voltage in order to compensate for the characteristic that the capacitance of the capacitor decreases and the internal resistance increases at low temperatures. Patent Document 2 discloses a technique for suppressing a voltage drop by suppressing a charging current when a temperature change in a direction in which the internal resistance of a battery increases is detected. Patent Document 3 discloses a technique for suppressing loss by reducing a change in current taken from a power source that uses a power storage device even during a sudden load change.
JP 2002-142373 A JP 2004-74874 A Japanese Patent Laid-Open No. 2004-166777

  However, the above-described conventional technology still cannot obtain a sufficiently stable power supply, and the power loss in the capacitor cannot be improved sufficiently. Therefore, the image forming apparatus cannot be operated stably.

  The present invention has been made in view of the above-described problems of the prior art, and provides a technique for stably supplying power from the capacitor in an image forming apparatus having an electric double layer capacitor as a power supply source. That is.

In order to solve the above-mentioned problems, an invention according to claim 1 is an image forming apparatus having an electric double layer capacitor and having power supply means for supplying power to each part in the apparatus through the electric double layer capacitor. ,
Heating means for heating the electric double layer capacitor.

  According to a second aspect of the present invention, in the first aspect of the present invention, the heating unit is a fixing unit that thermally fixes an image formed on a sheet, and the electric double layer capacitor is disposed in the vicinity of the fixing unit.

The invention according to claim 3 has an exhaust port for discharging the exhaust heat of the fixing device to the outside of the apparatus according to claim 2,
The electric double layer capacitor is disposed in a communication portion from the fixing device to the exhaust port.

  According to a fourth aspect of the present invention, in the first aspect of the present invention, the heating means is an element portion in the power supply means, and the electric double layer capacitor is disposed in the vicinity of the element portion.

  The invention according to claim 5 is the invention according to claim 4, wherein a heat sink is mounted on the element portion, and the electric double layer capacitor is disposed in the vicinity of the heat sink.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the heat radiating plate and the electric double layer capacitor are in contact with each other via a heat conducting member.

  The invention according to claim 7 is the invention according to claim 1, wherein the heating means is an in-machine dehumidifying heater, and the electric double layer capacitor is disposed in the vicinity of the in-machine dehumidifying heater.

  The invention according to claim 8 is the invention according to claim 1, wherein the heating means is a dedicated heater for heating the electric double layer capacitor.

The invention according to claim 9 is the invention according to claim 8, wherein switching means for switching the power supply destination of the electric double layer capacitor from each part in the device to the dedicated heater,
Control means for controlling the power supply destination by the switching means to switch to the dedicated heater when the device is in a warm-up state;
Have

  According to the first aspect of the present invention, the electric double layer capacitor that supplies power to each part in the apparatus can be heated, and the power supply from the electric double layer capacitor becomes unstable due to the internal resistance that increases at low temperatures. Therefore, stable power supply can be performed to each part.

  According to the second aspect of the present invention, it is possible to heat the electric double layer capacitor with the residual heat of the fixing device that thermally fixes the image formed on the paper.

  According to the third aspect of the present invention, the electric double layer capacitor can be heated by utilizing the exhaust heat of the fixing device that is discharged outside the apparatus.

  According to the fourth aspect of the present invention, the electric double layer capacitor can be heated by the residual heat of the element portion in the power supply means.

  According to the fifth aspect of the present invention, the electric double layer capacitor can be heated by efficiently transferring the remaining heat of the element portion through the heat sink.

  According to the sixth aspect of the present invention, the electric double layer capacitor can be heated by efficiently transferring heat from the heat radiating plate through the heat conducting member.

  According to the seventh aspect of the invention, the electric double layer capacitor can be heated by using the residual heat of the in-machine dehumidifying heater.

  According to the invention described in claim 8, the electric double layer capacitor can be heated by the dedicated heater.

  According to the ninth aspect of the present invention, priority can be given to heating of the electric double layer capacitor when the device itself is in a warm-up state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments. Further, the embodiment of the present invention shows the most preferable mode of the invention, and does not limit the scope of the invention.

[First Embodiment]
An image forming apparatus according to a first embodiment will be described with reference to FIGS. FIG. 1 is a conceptual diagram schematically showing a functional configuration of an image forming apparatus 1 according to the present embodiment. FIG. 2 is a block diagram schematically showing a functional configuration of the power supply unit 30. FIG. 3 is a conceptual diagram illustrating an apparatus side surface in the vicinity of the fixing unit 22. FIG. 4 is a conceptual diagram illustrating the exhaust heat path of the fixing unit 22. FIG. 5 is a graph showing the relationship between the temperature of the capacitor and the internal resistance value.

  First, the configuration of the image forming apparatus will be described. As shown in FIG. 1, the image forming apparatus 1 includes an image reading unit 10, an image forming unit 20, a power supply unit 30, a control unit 40, a dehumidifying heater 50, and a conveying unit 90.

  The image reading unit 10 includes an automatic document feeder 11 and a document image scanning device 12. The automatic document feeder 11 conveys the document d placed on the document table by the conveyance mechanism and sends it to the document image scanning device 12. The document image scanning device 12 optically scans the conveyed document d, The original image is read by photoelectric conversion by the sensor CCD.

  A document image (analog image signal) read by the image reading unit 10 is output to a control unit 40 described later, and subjected to various image processing such as analog processing, A / D conversion processing, shading correction, and image compression processing. After that, it is separated into colors of Y (yellow), M (magenta), C (cyan), and K (black), and is output to the exposure units 2Y, 2M, 2C, and 2K of the image forming unit 20 as output image data. The

  Note that the automatic document feeder 11 has a conveyor light for reading both sides of the document, and continuously images of a large number of documents d (including both sides) conveyed from the document table all at once. It is possible to read. The read document image data is stored in an image memory inside the image forming unit 20, and is sequentially read as output data at the time of output, and is output to the exposure units 2Y, 2M, 2C, and 2K. This function is used when copying a large number of original images by the copying function, or when transmitting data of a large number of originals d by the facsimile function.

  The image forming unit 20 forms an image on a sheet in a tandem method, and is an exposure unit 2Y, 2M, which is a light emitting element or the like arranged in a line in the main scanning direction for each of Y, M, C, and K colors. 2C, 2K, developing units 3Y, 3M, 3C, 3K, photosensitive drum 4Y, photosensitive drums 4M, 4C, 4K, primary transfer rollers 7Y, 7M, 7C, 7K, intermediate transfer belt 8 and the like. Around the photosensitive drums 4Y, 4M, 4C, and 4K, charging units 5Y, 5M, 5C, and 5K that perform charging, and cleaning units 6Y and 6M that remove residual toner on the photosensitive drums 4Y, 4M, 4C, and 4K. , 6C, 6K are provided.

  The image forming unit 20 also includes a secondary transfer roller 21 for transferring the toner image transferred onto the intermediate transfer belt 8 onto a sheet, and a fixing unit 22 for thermally fixing the toner image after transfer onto the sheet. ing. The intermediate transfer belt 8 is wound around a plurality of rollers and is rotatably supported. A cleaning unit 9 is provided facing the intermediate transfer belt 8 to remove residual toner on the intermediate transfer belt 8.

  Image formation in the image forming unit 20 is performed by forming an electrostatic latent image on the photosensitive drum of each color by the exposure unit under the control of the control unit 40 to be described later, and forming a toner image in which toner is attached to the electrostatic latent image. The toner image is formed on the intermediate transfer belt 8 and transferred to a sheet, and the toner image on the sheet is thermally fixed by the fixing unit 22.

  The power supply unit 30 has an electric double layer capacitor unit 31 disposed on the fixing unit 22. Specifically, as shown in FIG. 2, the power supply unit 30 includes an electric double layer capacitor unit 31, an external power supply 32, and a current control circuit 33. The power supply unit 30 supplies power supplied from the external power supply 32 to each unit of the image forming apparatus 1 via the electric double layer capacitor unit 31 under the control of the control unit 40.

  The control unit 40 includes a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), and the like (all not shown). The control unit 40 uses a predetermined area of the RAM as a work area in the CPU, reads a control program, an application program, and various setting data stored in a storage unit (not shown) such as a ROM or HDD, and sequentially executes them. The overall operation of the image forming apparatus 1 is controlled. Further, the control unit 40 performs the above-described various image processing by sequentially executing the above-described program.

  The dehumidifying heater 50 is a dehumidifying heater that is provided at the bottom of the image forming apparatus 1 and is driven under the control of the control unit 40 to adjust the temperature in the apparatus and prevent condensation.

  The transport unit 90 transports the paper placed on the paper trays T1 to T3 to each part along the transport path by a transport roller mechanism or the like, and discharges it to a discharge tray (not shown) outside the apparatus. To do. Specifically, the transport unit 90 transports the paper placed on the paper trays T <b> 1 to T <b> 3 to the secondary transfer roller 21, and fixes the paper after the toner image is transferred by the secondary transfer roller 21. , And the paper thermally fixed by the fixing unit 22 is discharged to a paper discharge tray.

  Here, the details of the electric double layer capacitor unit 31 will be described. As shown in FIGS. 3 and 4, the electric double layer capacitor unit 31 is configured to have a plurality of electric double layer capacitors 312 on a substrate 311. The electric double layer capacitor 312 is a capacitor that utilizes an electric double layer phenomenon in which electric charges are accumulated at the interface between a fixed electrode (for example, activated carbon) and an electrolyte. The withstand voltage limit of the electric double layer capacitor 312 is about 2.5 (V) at the maximum. For this reason, the electric double layer capacitor 312 is connected in series. For example, when 10 or more are connected in series, power can be supplied to a drive system such as a motor having a load of about 24 (V). In the case where an electric double layer capacitor is used as the electric double layer capacitor 312, it is possible to obtain a small capacitance and a large capacitance in units of farad (F). In addition, a special charge / discharge management circuit is not required and the battery can be charged in a short time.

  As shown in FIGS. 1, 3, and 4, the electric double layer capacitor unit 31 is disposed in the vicinity of the fixing unit 22 where the surrounding area becomes hot due to residual heat during operation. For this reason, the electric double layer capacitor unit 31 is heated by heat radiation from the fixing unit 22 that operates, and the temperature environment during operation becomes higher than when it is installed in another part.

  Further, the arrangement position of the electric double layer capacitor unit 31 with respect to the fixing unit 22 is an upper part of the fixing unit 22. For this reason, the electric double layer capacitor unit 31 is heated by being exposed to an atmosphere heated around the fixing unit 22 in operation.

  As shown in FIGS. 3 and 4, the side plates P1 and P2 in the vicinity of the fixing unit 22 in the image forming apparatus 1 have exhaust ports 34a and 34b for discharging the air heated by the fixing unit 22 and exhausting the air. Is provided. A top plate P3 is provided above the fixing unit 22, and a communication unit 35 for discharging the air heated by the fixing unit 22 to the exhaust ports 34a and 34b is formed. The electric double layer capacitor unit 31 is disposed in a communication unit 35 that is an upper part of the fixing unit 22. That is, the electric double layer capacitor unit 31 is disposed in the exhaust heat path of the fixing unit 22 and is efficiently heated by the residual heat of the fixing unit 22.

  The arrangement position of the electric double layer capacitor portion 31 may be any as long as it is within the communication portion 35 and is not particularly limited. Further, the installation direction of the electric double layer capacitor unit 31 is other than the installation direction in which the surface on which the electric double layer capacitor 312 is installed on the substrate 311 as shown in FIGS. There may be an installation direction in which the surface on which the electric double layer capacitor 312 is installed faces the fixing unit 22 side, and is not particularly limited.

  As described above, the image forming apparatus 1 includes the electric double layer capacitor unit 31 and the power supply unit 30 that supplies power to each unit of the apparatus through the electric double layer capacitor unit 31. In this configuration, the electric double layer capacitor unit 31 is heated by the fixing unit 22 that thermally fixes the image formed on the paper.

  For this reason, the image forming apparatus 1 can suppress the internal resistance of the electric double layer capacitor unit 31 to be low, and can stably supply power from the electric double layer capacitor unit 31 to each unit. Specifically, the temperature-internal resistance characteristic of each electric double layer capacitor in the electric double layer capacitor unit 31 has a high internal resistance value at a low temperature as shown in FIG. However, by heating the electric double layer capacitor unit 31 with the fixing unit 22, the internal resistance value of the electric double layer capacitor unit 31 can be lowered to suppress power loss, and stable power supply can be performed to each unit.

  The electric double layer capacitor has a lower internal resistance as its capacity increases, but its size increases and its cost increases. For example, as an electric double layer capacitor installed in the image forming apparatus 1, when a periodic inrush current is generated in the power supply unit 30 and the energy per one is 16 (J), 24 (V) The allowable voltage drop with respect to the power supply is set to 2 (V), and the capacitor capacity (C) required for the electric double layer capacitor unit 31 is 16 (J) = 1 / 2C × 24 ^ 2−1 / 2C × (24-2) When calculated by ^ 2, there is one that satisfies C = 0.35 (F).

  However, considering the internal resistance when connected in series, it is necessary to install one having a sufficient margin than the calculated value. However, in the image forming apparatus 1, since the internal resistance value of the electric double layer capacitor can be lowered, it is sufficient that the capacitance is about the calculated value described above, and an increase in cost can be prevented.

  Further, the image forming apparatus 1 has exhaust ports 34a and 34b for exhausting heat exhausted from the fixing unit 22 to the outside of the apparatus, and an exhaust heat path from the fixing unit 22 to the exhaust ports 34a and 34b for the electric double layer capacitor unit 31. It is the structure arrange | positioned in the communication part 35 which is. For this reason, the image forming apparatus 1 can efficiently heat the electric double layer capacitor unit 31 by the residual heat of the fixing unit 22 and reduce the internal resistance value of the electric double layer capacitor unit 31 to suppress power loss. A stable power supply can be performed.

[Modification 1]
Next, Modification 1 of the electric double layer capacitor unit 31 in the image forming apparatus 1 described above will be described with reference to FIG. FIG. 6 is a conceptual diagram illustrating an electric double layer capacitor unit 31a according to the first modification.

  As shown in FIG. 6, the electric double layer capacitor unit 31 a is an element unit related to the electric double layer capacitor 312 such as a charge / discharge management circuit in the vicinity of the plurality of electric double layer capacitors 312 installed on the substrate 311. The structure includes a diode 313, a transistor / FET 314, and a resistor 315. For this reason, in the electric double layer capacitor part 31a, the electric double layer capacitor 312 is heated by exposing to the thermal radiation of the element part mentioned above or the atmosphere heated by the element part.

  Further, heat sinks 316a and 316b are mounted on the diode 313 and the transistor / FET 314, respectively. The mounting of the heat sink in the element portion is abutted toward the installation direction of the electric double layer capacitor 312. The heat sinks 316a and 316b are made of a member having high thermal conductivity, for example, an aluminum molded product. The members of the heat sinks 316a and 316b may be other members (materials) as long as they have good thermal conductivity. As a member (material) having good thermal conductivity, for example, magnesium alloy, SUS (special purpose stainless steel plate), titanium alloy, iron, copper, various metals used for so-called die-cast products, resins having high thermal conductivity, etc. Is mentioned.

  As described above, in the image forming apparatus 1 shown in the first modification, the electric double layer capacitor 312 is installed in the vicinity of the diode 313, the transistor / FET 314, and the resistor 315, which are element units related to the electric double layer capacitor 312. It is a configuration. For this reason, in the first modification, the electric double layer capacitor 312 can be heated by the residual heat of the element portion, the internal resistance value of the electric double layer capacitor 312 is lowered to suppress power loss, and stable power supply to each portion It can be performed.

  Further, in the image forming apparatus 1 shown in the first modification, in the electric double layer capacitor unit 31a, the heat radiating plates 316a and 316b are mounted on the element portions such as the diode 313 and the transistor / FET 314, and the electric double layer is disposed in the vicinity of the heat radiating plate. The capacitor 312 is arranged. For this reason, in the modified example 1, the electric double layer capacitor 312 can be efficiently heated by the element portion by being exposed to heat radiation by the heat sinks 316a and 316b and an atmosphere heated by the heat sink.

[Modification 2]
Next, Modification 2 of the electric double layer capacitor unit 31 in the image forming apparatus 1 described above will be described with reference to FIG. FIG. 7 is a conceptual diagram illustrating an electric double layer capacitor unit 31b according to Modification 2.

  As shown in FIG. 7, the electric double layer capacitor unit 31 b includes a heat sink 316 mounted on the element unit such as the above-described transistors / FETs 314 and 313 and a plurality of electric double layer capacitors 312 on the substrate 311. The installation position is fixed by the fixing member 318 and the heat contact sheet 317 is contacted. In addition, the heat conductive sheet 317 may be any member as long as it has a high heat conductivity, like the heat sink.

  As described above, in the image forming apparatus 1 shown in the modified example 2, in the electric double layer capacitor unit 31b, the heat radiating plate 316 is mounted on the element unit, and the heat radiating plate 316 and the electric double layer capacitor 312 are in heat conduction. It is a structure which contacts via the sheet | seat 317. FIG. For this reason, in the modified example 2, the residual heat of the element part can be conducted to the electric double layer capacitor 312 via a member having high thermal conductivity, and the electric double layer capacitor 312 can be heated more efficiently.

[Modification 3]
Next, a modification 3 of the image forming apparatus 1 described above, which is a modification of the installation location of the electric double layer capacitor unit 31, will be described with reference to FIG. FIG. 8 is a conceptual diagram illustrating a modification of the installation location of the electric double layer capacitor unit.

  As shown in FIG. 8, the electric double layer capacitor unit 31 is in the vicinity of the dehumidifying heater 50 for in-machine dehumidification installed on the bottom plate P <b> 4 or the like, and may be installed on the dehumidifying heater 50. That is, in the third modification, the electric double layer capacitor unit 31 can be heated by the residual heat of the dehumidifying heater 50.

[Modification 4]
Next, Modification 4 of the above-described image forming apparatus 1 will be described with reference to FIGS. FIG. 9 is a conceptual diagram illustrating an electric double layer capacitor unit 31c according to Modification 4. FIG. 10 is a block diagram schematically illustrating a functional configuration of the power supply unit 30c according to the fourth modification.

  As shown in FIG. 9, the electric double layer capacitor unit 31 c includes a plurality of electric double layer capacitors 312 and a heat radiating plate 316 provided with heaters 319 a and 319 b on a substrate 311 via a heat conductive sheet 317. In contact with each other. That is, the electric double layer capacitor unit 31 c has a dedicated heater for heating the electric double layer capacitor 312.

  The heaters 319a and 319b may be halogen heaters, carbon heaters, heating wires, ceramic heaters, induction heating (IH) coils, or the like, and are not particularly limited.

  Further, the installation configuration of the heaters 319a and 319b and the electric double layer capacitor 312 is other than the configuration in which heat conduction is performed through the heat radiating plate 316 and the heat conductive sheet 317 as illustrated in FIG. There may be a configuration in which the heat radiation by the heater and the atmosphere around the electric double layer capacitor 312 are heated to a high temperature, such as disposing the electric double layer capacitor 312 in the vicinity of 319b, and is not particularly limited.

  As shown in FIG. 10, the electric double layer capacitor unit 31c supplies the power supplied from the external power supply 32 to each unit of the image forming apparatus 1 through the electric double layer capacitor unit 31c under the control of the control unit 40. The switch 36 is configured to switch the power supply destination via the electric double layer capacitor unit 31c to each unit of the image forming apparatus 1 or the heaters 319a and 319b. Switching of the power supply destination in the changeover switch 36 is performed based on a control signal from the control unit 40.

  The control unit 40 outputs a control signal to the changeover switch 36 so that the power supply destination via the electric double layer capacitor unit 31c is switched to the heaters 319a and 319b at the time of warming up each unit of the own device. This warm-up is preparation by driving the fixing unit 22 and the dehumidifying heater 50 under the control of the control unit 40 so that image formation can be performed quickly. .

  In addition, the switching of the power supply destination at the time of the warm-up described above may be performed as long as the power supply to the heaters 319a and 319b is preferentially performed, for example, the power is first supplied to the heaters 319a and 319b and then supplied to other units. . Specifically, after the electric double layer capacitor unit 31 is sufficiently heated after a predetermined time has elapsed, it may be configured to be supplied to other units.

  As described above, the image forming apparatus 1 shown in the modified example 4 includes the heaters 319 a and 319 b that are dedicated heaters for heating the electric double layer capacitor 312. For this reason, in the modification 4, the internal resistance of the electric double layer capacitor part 31c can be suppressed low, and stable electric power can be supplied from the electric double layer capacitor part 31c to each part.

  Moreover, in the modification 4, the changeover switch 36 which switches the electric power supply destination of the electric double layer capacitor part 31c from each part in the own apparatus to the heaters 319a and 319b, and the changeover switch 36 when the own apparatus is in a warm-up state. And a control unit 40 that controls to switch the power supply destination to the heaters 319a and 319b.

  For this reason, in the modification 4, the electric double layer capacitor unit 31c can be first heated at the time of warm-up, and even when used in a cold region, stable electric power is supplied from the electric double layer capacitor unit 31 to each unit. Supply can be made.

  Note that the description in the above-described embodiment shows an example, and the present invention is not limited to this. The configuration and operation in the embodiment described above can be changed as appropriate.

1 is a conceptual diagram illustrating a configuration of an image forming apparatus according to a first embodiment. It is a block diagram which shows typically the functional structure of a power supply part. FIG. 3 is a conceptual diagram illustrating a side surface in the vicinity of a fixing unit. It is a conceptual diagram which illustrates the waste heat path of a fixing part. It is a graph which shows the relationship between the temperature of a capacitor, and an internal resistance value. 10 is a conceptual diagram illustrating an electric double layer capacitor unit according to Modification 1. FIG. 10 is a conceptual diagram illustrating an electric double layer capacitor unit according to Modification 2. FIG. It is a conceptual diagram which illustrates the modification of the installation place of an electric double layer capacitor part. 10 is a conceptual diagram illustrating an electric double layer capacitor unit according to Modification 4. FIG. 10 is a block diagram schematically showing a functional configuration of a power supply unit according to Modification 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Image forming apparatus 10 Image reading part 20 Image forming part 21 Secondary transfer roller 22 Fixing part 30, 30c Power supply part 31, 31a, 31b, 31c Electric double layer capacitor part 311 Substrate 312 Electric double layer capacitor 313 Diode 314 Transistor / FET
315 Resistors 316, 316a, 316b Heat radiation plate 317 Heat conduction sheet 318 Fixing member 319a, 319b Heater 32 External power supply 33 Current control circuit 34a, 34b Exhaust port 35 Communication unit 36 Changeover switch 40 Control unit 50 Dehumidifying heater 90 Conveying unit P1, P2 Side plate P3 Top plate P4 Bottom plate

Claims (9)

In an image forming apparatus having an electric double layer capacitor and having power supply means for supplying power to each part in the apparatus through the electric double layer capacitor,
An image forming apparatus having a heating means for heating the electric double layer capacitor.   The image forming apparatus according to claim 1, wherein the heating unit is a fixing unit that thermally fixes an image formed on a sheet, and the electric double layer capacitor is disposed in the vicinity of the fixing unit. An exhaust port for exhausting heat from the fixing device to the outside of the machine;
The image forming apparatus according to claim 2, wherein the electric double layer capacitor is disposed in a communication portion from the fixing device to an exhaust port.   The image forming apparatus according to claim 1, wherein the heating unit is an element unit in the power supply unit, and the electric double layer capacitor is disposed in the vicinity of the element unit.   The image forming apparatus according to claim 4, wherein a heat sink is mounted on the element portion, and the electric double layer capacitor is disposed in the vicinity of the heat sink.   The image forming apparatus according to claim 5, wherein the heat radiating plate and the electric double layer capacitor are in contact with each other through a heat conducting member.   The image forming apparatus according to claim 1, wherein the heating unit is an in-machine dehumidifying heater, and the electric double layer capacitor is disposed in the vicinity of the in-machine dehumidifying heater.   The image forming apparatus according to claim 1, wherein the heating unit is a dedicated heater for heating the electric double layer capacitor. Switching means for switching the power supply destination of the electric double layer capacitor from each part in the device to the dedicated heater;
Control means for controlling the power supply destination by the switching means to switch to the dedicated heater when the device is in a warm-up state;
The image forming apparatus according to claim 8, comprising:

Images