Image forming apparatus

Abstract

To provide an image forming apparatus that prevents the generation of electromagnetic noise while maintaining the easiness of replacement of a power supply device.SOLUTION: An image forming apparatus 100 comprises: an AC / DC power supply substrate 500 that supplies power to components for performing image formation; an IH power supply substrate 510 that supplies power to the components for performing image formation; a sheet metal 721 for partitioning that separates the AC / DC power supply substrate 500 and the IH power supply substrate 510 from each other; and cylindrical sheet metals 720, 722 that collectively cover the AC / DC power supply substrate 500 and the IH power supply substrate 510. The AC / DC power supply substrate 500 and the IH power supply substrate 510 can be drawn out in a clear aperture direction (Y-axis direction) of the cylindrical sheet metals 720, 722.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to an image forming apparatus such as a printer, a copier, or a multifunction peripheral. [Background technology]

[0002] An image forming apparatus includes a plurality of boards on which electronic components are mounted in order to control mechanical components (hereinafter simply referred to as "components") used in image formation. It is desirable that the boards be easily replaceable in the event of a breakdown or the like. For example, Patent Document 1 discloses an image forming apparatus in which boards are configured as a single detachable unit. In order to configure the boards as a single unit, the electrical unit such as the boards can be accessed by operation from one direction. In recent years, many techniques have been proposed to reduce such service costs. The power supply device mounted in the image forming apparatus is generally a switching device. For this reason, as shown in Patent Document 2, the power supply device is generally configured as a box-shaped unit covered with a shielding member to prevent electromagnetic noise radiated from the built-in board.

[0003] Medium and high speed image forming devices used in offices require fast startup times and power efficiency for the fixing units. For this reason, image forming devices generally have IH (Induction Heating) power supplies. Image forming devices equipped with IH power supplies are subject to specific electromagnetic wave regulations, such as the Radio Law in Japan, FCC Part 18 in North America, and EN55011 in Europe, and therefore require strict confirmation of electromagnetic wave effects due to a wider frequency band than other image forming devices.

[0004] In addition, image forming apparatuses tend to have an AC / DC power supply device that converts AC power supplied from a commercial power source into DC power for internal use and an IH power supply device arranged adjacent to each other. In order to facilitate the replacement of the circuit boards of each power supply device and to deal with the effects of electromagnetic noise, it is preferable that the AC / DC power supply device and the IH power supply device are arranged as separate units. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2007-133433 A [Patent Document 2] Patent Publication No. 2021-4958 Summary of the Invention [Problem to be solved by the invention]

[0006] When an AC / DC power supply and an IH power supply are placed adjacent to each other, it is possible to form a shield to prevent direct radiation from each power supply. However, for example, when a metal plate provided on the AC / DC power supply and a metal plate provided on the IH power supply are adjacent to each other at a certain distance, parallel plate resonance may occur, and the metal plate may function as an antenna and emit a large electromagnetic wave.

[0007] SUMMARY OF THE PRESENT DISCLOSURE In view of the above problems, a primary object of the present invention is to provide an image forming apparatus in which the generation of electromagnetic noise is suppressed while maintaining ease of replacement of the power supply device. [Means for solving the problem]

[0008] The image forming apparatus of the present invention comprises a first power supply board that supplies power to components for image formation, a second power supply board that supplies power to components for image formation, a partitioning metal plate that separates the first power supply board and the second power supply board, and a cylindrical metal plate that covers the first power supply board and the second power supply board as a whole, and is characterized in that the first power supply board and the second power supply board can be pulled out in the direction of an opening of the cylindrical metal plate. Effect of the Invention

[0009] According to the present invention, it is possible to suppress the generation of electromagnetic noise while maintaining the ease of replacing the power supply board. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram illustrating the configuration of an image forming apparatus. [Diagram 2] 1A and 1B are explanatory diagrams of a power supply unit of a general image forming apparatus. [Diagram 3] 3A and 3B are explanatory diagrams of a power supply unit according to the embodiment. [Figure 4] 1(a) to (c) are explanatory diagrams of an integrated power supply unit. [Diagram 5] 13A and 13B are explanatory diagrams of an integrated power supply unit having another configuration. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0012] Fig. 1 is a configuration diagram of an image forming apparatus according to this embodiment. This image forming apparatus 100 employs an electrophotographic system and forms a monochrome image. Note that the image forming apparatus 100 may be an image forming apparatus that forms a color image. The image forming apparatus 100 is, for example, a printer, a copier, a facsimile, a multifunction machine, or the like. An orthogonal coordinate system is defined with the left-right direction in Fig. 1 as the X-axis, the up-down direction as the Y-axis, and the depth direction as the Z-axis.

[0013] Image forming apparatus 100 is provided with, in that order from the bottom (negative side of the Y axis: upstream in the recording material transport direction) to the top (positive side of the Y axis: downstream in the recording material transport direction), a recording material feeding section 10, an image forming section 20, a fixing section 30, and a recording material discharging section 40. A recording material re-feeding section 50 is provided to the right (negative side of the X axis) of the image forming section 20 and the fixing section 30. Image forming apparatus 100 incorporates a control section 600. The control section 600 controls the operation of each section to print an image on recording material P.

[0014] The recording material feeding section 10 includes a paper feed cassette 11 on which recording material S is stacked, and a manual feed tray 16. The recording material S is fed from the paper feed cassette 11 or the manual feed tray 16 to the image forming section 20. The paper feed cassette 11 includes a recording material detection sensor S1. The recording material detection sensor S1 can detect whether or not a recording material P is stored in the paper feed cassette 11. The recording material feeding section 10 includes a pickup roller 12, a separation roller pair 13, a feed roller pair 14, and a registration roller pair 15 for transporting the recording material S from the paper feed cassette 11.

[0015] The recording material P stored in the paper feed cassette 11 is fed to the separation roller pair 13 by the pickup roller 12. The separation roller pair 13 is composed of a forward roller and a reverse roller, and separates the recording material P fed from the pickup roller 12 into one sheet. The separation roller pair 13 conveys the recording material S separated into one sheet to the feed roller pair 14 via the feed path PS1. The feed roller pair 14 conveys the recording material S to the registration roller pair 15 in a rotation-stopped state. The recording material S enters the nip portion of the registration roller pair 15 in a rotation-stopped state, so that the leading edge of the recording material S is aligned in the nip portion, and skew is corrected. A pre-registration sensor S2 is provided between the feed roller pair 14 and the registration roller pair 15. The pre-registration sensor S2 detects the timing when the leading edge of the recording material P reaches the nip of the registration roller pair 15.

[0016] The recording material feeding section 10 includes a supply roller 17, a separation pad 18, and a supply roller pair 19 to feed the recording material S from the manual feed tray 16. The recording material P loaded on the manual feed tray 16 is separated into one sheet by the supply roller 17 and the separation pad 18 and pulled into the image forming apparatus 100. The supply roller pair 19 feeds the separated recording material S to the feed roller pair 14. The recording material S conveyed to the feed roller pair 14 is fed to the registration roller pair 15 in the same manner as when the recording material S is fed from the paper feed cassette 11.

[0017] The recording material S, whose skew has been corrected by the pair of registration rollers 15, is transported at a predetermined timing to the image forming unit 20. For this purpose, the pair of registration rollers 15 start rotating at a predetermined timing after the skew correction, and transport the recording material S.

[0018] The image forming unit 20 includes a photosensitive drum 21, a charging roller 22, a laser unit 23, and a developing device 26. The surface of the photosensitive drum 21 is uniformly charged by the charging roller 22. The laser unit 23 irradiates the charged surface of the photosensitive drum 21 with a laser beam corresponding to image information acquired from the control unit 600. The portion of the photosensitive drum 21 irradiated with the laser beam has electric charge removed, forming an electrostatic latent image corresponding to the image information. The developing device 26 attaches a developer to the electrostatic latent image. This makes the electrostatic latent image visible as a developer image.

[0019] The developing device 26 has a developing roller 24. The developing roller 24 causes the developer to adhere to the electrostatic latent image. The developing device 26 is supplied with developer from a container 27 having an agitating member 28 therein. The container 27 stores the developer, and supplies the developer to the developing device 26 as the agitating member 28 rotates. The amount of developer in the container 27 is detected by a developer detection sensor S4.

[0020] The developer image formed on the photosensitive drum 21 is transported to the transfer nip portion N1 by the rotation of the photosensitive drum 21. The transfer nip portion N1 is a nip portion between the photosensitive drum 21 and a transfer roller 25. The registration roller pair 15 transports the recording material P to the transfer nip portion N1 in accordance with the timing at which the developer image is transported to the transfer nip portion N1. While the recording material P is nipped and transported between the photosensitive drum 21 and the transfer roller 25 at the transfer nip portion N1, the developer image formed on the photosensitive drum 21 is transferred onto the recording material P by the transfer roller 25.

[0021] The recording material P onto which the developer image has been transferred is conveyed to the fixing section 30. The fixing section 30 includes a fixing roller 31, a pressure roller 32, and a fixing sensor S3. The fixing roller 31 includes a heating coil that generates magnetic flux, a core, and a heated member. The fixing roller 31 is heated to a predetermined fixing temperature by a so-called IH heating device in which a magnetic path is formed between the core and the heated member by the action of the magnetic flux generated by the heating coil, and the heated member is heated by electromagnetic induction. The pressure roller 32 contacts the fixing roller 31 and presses the fixing roller 31 with a predetermined pressure. The fixing nip section N2 is formed by the fixing roller 31 and the pressure roller 32. The recording material P onto which the developer image has been transferred is heated and pressurized while being sandwiched and conveyed between the fixing roller 31 and the pressure roller 32 in the fixing nip section N2, so that the developer image is fixed. The fixing sensor S3 detects that the leading edge of the recording material P has passed through the fixing nip section N2.

[0022] The recording material P on which the developer image has been fixed is transported to a recording material discharge section 40. The recording material discharge section 40 includes a discharge roller pair 41. The discharge roller pair 41 discharges the recording material P on which the developer image has been fixed onto a discharge tray 42 as a printed matter.

[0023] When an image is printed on both sides of the recording material P, the recording material P with an image printed on the first side is transported to the recording material re-feeding section 50. The recording material discharge section 40 temporarily stops the pair of discharge rollers 41 before the rear end of the recording material P passes through the pair of discharge rollers 41, and then rotates the pair of discharge rollers 41 in the reverse direction. This causes the recording material P to be transported to the recording material re-feeding section 50.

[0024] The recording material re-feeding section 50 includes re-feeding roller pairs 51, 52, and 53, and conveys the recording material P to the registration roller pair 15 via a re-feeding path PS2. By passing through the recording material discharge section 40 and the recording material re-feeding section 50, the side on which an image is to be printed of the recording material P is inverted from the first side to the second side. The recording material P conveyed to the registration roller pair 15 has an image printed on the second side by the same process as for the first side, and is then discharged to the discharge tray 42.

[0025] Fig. 2 is an explanatory diagram of a general power supply unit of image forming apparatus 100. Fig. 3 is an explanatory diagram of a power supply unit of image forming apparatus 100 according to this embodiment. Image forming apparatus 100 includes, as power supply units, an AC / DC power supply board 500 that functions as an AC / DC power supply device that converts AC power supplied from a commercial power source via outlet 200 into DC power, and an IH power supply board 510 that functions as an IH power supply device. Image forming apparatus 100 includes an AC input board 201 that accepts AC power supplied from the commercial power source via outlet 200.

[0026] The AC / DC power supply board 500 is supplied with AC power via the AC input board 201. The AC / DC power supply board 500 converts the AC power into DC power to be supplied to each unit in the image forming apparatus 100. The IH power supply board 510 supplies the AC power supplied via the AC input board 201 to the heating coil of the fixing unit 30, thereby quickly and efficiently increasing the temperature of the fixing roller 31.

[0027] 2(a), conventionally, an AC / DC power supply board 500 and an IH power supply board 510 are arranged as separate power supply units to facilitate the replacement of each board and to counter the effects of electromagnetic noise. An AC / DC power supply unit 702 is configured by covering the four sides in the XZ directions of an AC / DC power supply board 500 with metal plate 701. The AC / DC power supply board 500 is shielded by the metal plate 701. An IH power supply unit 712 is configured by covering the four sides in the XZ directions of an IH power supply board 510 with metal plate 711. The IH power supply board 510 is shielded by the metal plate 711.

[0028] 2(b), when the AC / DC power supply unit 702 and the IH power supply unit 712 are adjacent to each other, the surface a of the metal plate 701 covering the AC / DC power supply board 500 and the surface b of the metal plate 711 covering the IH power supply board 510 are adjacent to each other at a distance δx2. The surface a of the metal plate 701 and the surface b of the metal plate 711 face each other, and the distance δx2 is the shortest distance between the metal plates 701 and 711. In this case, there is a possibility that the metal plates 701 and 711 will cause parallel plate resonance. The metal plates 701 and 711 that cause parallel plate resonance will become antennas and radiate large electromagnetic waves.

[0029] Incidentally, by forming the surface b of the metal plate 711 on the side of the metal plate 701 from a material other than metal, it is possible to suppress the radiation of electromagnetic waves. However, in this case, one side of the IH power supply unit 712 on the side of the metal plate 701 is opened, and electromagnetic noise from the IH power supply board 510 is radiated from the gap of δx2. In addition, parallel plate resonance can be prevented by providing a leaf spring or the like between the metal plates 711 and 701. However, with this method, there is a possibility that sufficient grounding cannot be achieved due to variations caused by the tolerance of the leaf spring. In addition, depending on the position and number of the leaf springs provided, the resonance frequency of the IH power supply board 510 simply shifts to a higher frequency, and sufficient electromagnetic noise suppression effect cannot be obtained for a wide frequency band.

[0030] In the power supply unit of this embodiment, as shown in FIG. 3(a), the AC / DC power supply board 500 and the IH power supply board 510 are disposed inside the integrated power supply unit 520. FIG. 3(b) is a top view of the integrated power supply unit 520. In the power supply unit of this embodiment, the AC / DC power supply board 500 and the IH power supply board 510 are integrally covered with a cylindrical metal plate, and the AC / DC power supply board 500 and the IH power supply board 510 are partitioned by a metal plate 721. The cylindrical metal plate covering the AC / DC power supply board 500 and the IH power supply board 510 may be one metal plate, or may be composed of a combination of multiple metal plates. The multiple metal plates may be at least a part of the metal plate to which the AC / DC power supply board 500 and the IH power supply board 510 are attached. In this embodiment, the cylindrical metal plate is composed of the metal plate 721 and the metal plate 722 to which the IH power supply board 510 is attached.

[0031] In this configuration, only one metal plate 721 exists between the AC / DC power supply board 500 and the IH power supply board 510. The AC / DC power supply board 500 is attached to the metal plate 721. Therefore, the closest metal plate to the metal plate 721 is the metal plate 722 arranged opposite to the IH power supply board 510 with the IH power supply board 510 in between. The metal plates 721 and 722 can be spaced apart by a distance δx3, which is the sum of the insulation distance between the mounting components (IGBT, heat sink, etc., with a size in the X-axis direction of at least about 40 [mm]) of the IH power supply board 510 and the AC part of the AC / DC power supply board 500. The four sides of the AC / DC power supply board 500 and the IH power supply board 510 in the XZ direction are covered by the cylindrical metal plates 722 and 720, which prevents direct radiation of electromagnetic noise and suppresses the resonance effect caused by the parallel plates. This is because the resonance effect caused by the parallel plates is inversely proportional to the distance. This reduces the possibility of large electromagnetic waves being emitted by the metal sheets 721 and 722. Furthermore, the Y-axis direction, which is the opening direction of the cylindrical metal sheets, of the AC / DC power supply board 500 and the IH power supply board 510 is not covered with the metal sheets. Therefore, the AC / DC power supply board 500 and the IH power supply board 510 can be easily pulled out in the Y-axis direction, respectively, maintaining ease of replacement.

[0032] FIG. 4 is an explanatory diagram of the integrated power supply unit 520. As shown in FIG.

[0033] FIG. 4(a) is a perspective view of each component of the integrated power supply unit 520 before assembly. The AC / DC power supply board 500 is attached parallel to a first surface 503 of a supporting plate 501 formed in an L-shape. The AC / DC power supply board 500 is attached by a general screw fastening method. In order to provide shielding properties, the first surface 503 of the supporting plate 501 is larger than the board of the AC / DC power supply board 500 in the YZ directions, and the second surface 504 perpendicular to the first surface 503 is larger than the board of the AC / DC power supply board 500 in the XY directions. That is, the supporting plate 501 is configured so that the first surface 503 is larger than the surface on which the electronic components of the AC / DC power supply board 500 are mounted, and the second surface 504 is larger than the surface perpendicular to the surface on which the electronic components of the AC / DC power supply board 500 are mounted. A unit in which the AC / DC power supply board 500 and the supporting plate 501 are integrated is referred to as an "AC / DC power supply unit 502."

[0034] The IH power supply board 510 is attached parallel to a first surface 513 of the supporting metal plate 511 formed in an L-shape. The IH power supply board 510 is attached by a general screw fastening method. In order to provide shielding properties, the first surface 513 of the supporting metal plate 511 is larger than the board of the IH power supply board 510 in the YZ directions, and the second surface 514 perpendicular to the first surface 513 is larger than the board of the IH power supply board 510 in the XY directions. That is, the supporting metal plate 511 is configured so that the first surface 513 is larger than the surface of the IH power supply board 510 on which electronic components are mounted, and the second surface 514 is larger than the surface of the IH power supply board 510 perpendicular to the surface on which the electronic components are mounted. A unit formed by integrating the IH power supply board 510 and the supporting metal plate 511 is referred to as an "IH power supply unit 512."

[0035] The integrated power supply unit 520 further includes an L-shaped metal plate 541 and a cooling fan unit 542. The metal plate 541 has a first surface 546 and a second surface 547 perpendicular to the first surface 546. The cooling fan unit 542 is configured by integrating a duct including a cooling fan 543, an AC / DC power supply unit fixing portion 544, an AC / DC power supply unit mounting rail portion 545, an IH power supply unit fixing portion 554, and an IH power supply board mounting rail portion 555. The cooling fan 543 cools the AC / DC power supply board 500 and the IH power supply board 510. The AC / DC power supply unit mounting rail portion 545 is provided with a groove for guiding the AC / DC power supply unit 502 in the Z direction. The IH power supply board mounting rail portion 555 is provided with a groove for guiding the IH power supply unit 512 in the Z direction. The cooling fan unit 542 functions as a fixing unit that fixes the AC / DC power supply board 500 and the IH power supply board 510 together.

[0036] 4(b) is a perspective view of the assembled integrated power supply unit 520. A cooling fan unit 542 is disposed on the bottom surfaces of the AC / DC power supply unit 502 and the IH power supply unit 512. A first surface 546 and a second surface 547 of a metal plate 541 are fastened to two sides of the cooling fan unit 542 with screws (not shown).

[0037] The supporting metal plate 501 of the AC / DC power supply unit 502 is placed on the AC / DC power supply unit mounting rail portion 545. A second surface 504 of the supporting metal plate 501 is fastened to the AC / DC power supply unit fixing portion 544 with a screw. The supporting metal plate 511 of the IH power supply unit 512 is placed on the IH power supply board mounting rail portion 555. A second surface 514 of the supporting metal plate 511 is fastened to the IH power supply unit fixing portion 554 with a screw.

[0038] FIG. 4(c) is a top view of the integrated power supply unit 520. The supporting metal plate 501 functions as a partitioning metal plate that separates the AC / DC power supply board 500 and the IH power supply board 510. The four sides of the integrated power supply unit 520 viewed from above are sealed without any gaps, ensuring the shielding properties. If the integrated power supply unit 520 is simply surrounded by a metal plate formed into an L shape, a gap of δx4 will be generated in the X direction between the supporting metal plate 501 and the supporting metal plate 511, and a gap of δz4 will be generated in the Z direction between the supporting metal plate 511 and the metal plate 541, due to tolerances. Such gaps reduce the shielding properties (left diagram). In order to ensure the shielding properties, the supporting metal plate 501 and the supporting metal plate 511, and the supporting metal plate 511 and the metal plate 541 are assembled so as to overlap each other. This allows the shielding effect of the integrated power supply unit 520 to be fully exhibited (right diagram).

[0039] Figure 5 is an explanatory diagram of an integrated power supply unit 620 having another configuration. Figure 5(a) is a perspective view of each component of the integrated power supply unit 620 before assembly.

[0040] The AC / DC power supply board 500 is attached parallel to a first surface 604 of a supporting plate 601. Electronic components for realizing the functions of the AC / DC power supply board 500 are mounted on the board. The board is attached by general screw fastening. In order to provide shielding properties, the first surface 604 of the supporting plate 601 is larger than the AC / DC power supply board 500 in the YZ directions. A unit formed by integrating the AC / DC power supply board 500 and the supporting plate 601 is called an "AC / DC power supply unit 602." The supporting plate 601 has a fixing portion 603 on a second surface 605 perpendicular to the first surface 604 in order to fix the AC / DC power supply unit 602. The supporting plate 601 functions as a partitioning plate that separates the AC / DC power supply board 500 and the IH power supply board 510.

[0041] The IH power supply board 510 is attached parallel to a first surface 614 of a supporting metal plate 611. Electronic components for realizing the functions of the IH power supply board 510 are mounted on the board. The board is attached by general screw fastening. In order to provide shielding properties, the first surface 614 of the supporting metal plate 611 is larger than the IH power supply board 510 in the YZ directions. The unit formed by integrating the IH power supply board 510 and the supporting metal plate 611 is called an "IH power supply unit 612." The supporting metal plate 611 has a fixing portion 613 on a second surface 615 perpendicular to the first surface 614 in order to fix the IH power supply unit 612.

[0042] The integrated power supply unit 620 also includes a flat metal plate 531, an L-shaped metal plate 541, and a cooling fan unit 542. The metal plate 531 is configured to be larger than the sum of the sizes in the X and Y directions of the AC / DC power supply board 500 and the IH power supply board 510. The metal plate 541 and the cooling fan unit 542 are configured as described with reference to FIG. 4(a).

[0043] Fig. 5(b) is a perspective view of an integrated power supply unit 620 assembled from the parts in Fig. 5(a). A cooling fan unit 542 is disposed on the bottom surfaces of the AC / DC power supply unit 502 and the IH power supply unit 512. The method of fastening the cooling fan unit 542 to the metal plate 541 is the same as in Fig. 4(b).

[0044] A first surface 604 of a supporting metal plate 601 of the AC / DC power supply unit 502 is placed on the AC / DC power supply unit mounting rail portion 545. A fixing portion 603 of the supporting metal plate 601 is fastened with a screw to the AC / DC power supply unit fixing portion 544, with the AC / DC power supply board 500 sandwiched therebetween. A first surface 614 of a supporting metal plate 611 of the IH power supply unit 512 is placed on the IH power supply board mounting rail portion 555. A fixing portion 613 of the supporting metal plate 611 is fastened with a screw to the IH power supply unit fixing portion 554, with the IH power supply board 510 sandwiched therebetween.

[0045] In the integrated power supply unit 520 (620) configured as above, the AC / DC power supply unit 502 (602) and the IH power supply unit 512 (612) are not directly connected. Therefore, the AC / DC power supply unit 502 (602) and the IH power supply unit 512 (612) can be removed independently. In addition, a supporting metal plate 501 (601) is provided between the AC / DC power supply unit 502 (602) and the IH power supply unit 512 (612), and the entire unit is covered with the metal plate. Such an integrated power supply unit 520 is configured to ensure the shielding properties of the AC / DC power supply board 500 and the IH power supply board 510, while allowing easy maintenance.

[0046] The integrated power supply unit 520 (620) of the present embodiment is configured by integrating the AC / DC power supply unit 502 (602), the IH power supply unit 512 (612), and the L-shaped metal plate 541 having two vertical sides, as well as the cooling fan unit 542 that fastens them together. The integrated power supply unit 520 has a shielding property by sealing the four sides of the AC / DC power supply unit 502 (602) and the IH power supply unit 512 (612) as viewed from above. For this reason, it is also possible to configure the integrated power supply unit 520 using a metal plate having only a screw fastening function, instead of the cooling fan unit 542. The integrated power supply unit 520 may be configured with a plurality of AC / DC power supply units 502 (602) and a plurality of IH power supply units 512 (612).

Claims

1. A first power supply board for supplying power to components for image formation, a second power supply board for supplying power to components for image formation, a partition sheet metal for partitioning between the first power supply board and the second power supply board, and a cylindrical sheet metal for covering the first power supply board and the second power supply board, wherein the first power supply board and the second power supply board can be pulled out in the direction of the opening of the cylindrical sheet metal, an image forming apparatus.

2. further comprising a support sheet metal formed in an L shape to which the second power supply board is attached, wherein the partition sheet metal is formed in an L shape and the first power supply board is attached thereto, the cylindrical sheet metal includes a sheet metal formed in an L shape, and the support sheet metal, the partition sheet metal, and the sheet metal formed in an L shape form a cylinder, the image forming apparatus according to claim 1.

3. further comprising a flat support sheet metal to which the second power supply board is attached, wherein the partition sheet metal is a flat plate to which the first power supply board is attached, the cylindrical sheet metal includes a sheet metal formed in an L shape and a flat sheet metal, and the support sheet metal, the sheet metal formed in an L shape, and the flat sheet metal form a cylinder, the image forming apparatus according to claim 1.

4. the first power supply board is attached parallel to the first surface of the partition sheet metal, the partition sheet metal is configured such that the first surface is larger than the surface on which the electronic components of the first power supply board are mounted, the partition sheet metal has a second surface orthogonal to the first surface, and the second surface is configured to be larger than the surface orthogonal to the surface on which the electronic components of the first power supply board are mounted, the image forming apparatus according to claim 2.

5. the first power supply board is attached parallel to the first surface of the partition sheet metal, the partition sheet metal is configured such that the first surface is larger than the surface on which the electronic components of the first power supply board are mounted, the image forming apparatus according to claim 2 or 3.

6. the second power supply board is attached parallel to the first surface of the support sheet metal, the support sheet metal is configured such that the first surface is larger than the surface on which the electronic components of the second power supply board are mounted, the support sheet metal has a second surface orthogonal to the first surface, The second surface is configured to be larger than a surface orthogonal to the surface on which the electronic components of the second power supply substrate are mounted. The image forming apparatus according to claim 2.

7. The second power supply substrate is attached in parallel to the first surface of the support sheet metal. The support sheet metal is characterized in that the first surface is larger than the surface on which the electronic components of the second power supply substrate are mounted. The image forming apparatus according to claim 2 or 3.

8. The first power supply substrate is an AC / DC power supply device that converts AC power supplied from a commercial power supply into DC power. The image forming apparatus according to any one of claims 1 to 3.

9. The component includes a heating coil. The second power supply substrate is an IH power supply device that supplies AC power to the heating coil. The image forming apparatus according to any one of claims 1 to 3.

10. The image forming apparatus further includes a fixing unit that fixes the first power supply substrate and the second power supply substrate. The partition sheet metal has a first fixing portion for fixing the first power supply substrate to the fixing unit, orthogonal to the surface on which the first power supply substrate is attached. The support sheet metal is characterized in that it has a second fixing portion for fixing the second power supply substrate to the fixing unit, orthogonal to the surface on which the second power supply substrate is attached. The image forming apparatus according to claim 2 or 3.

Images