Image forming device

Abstract

To provide an image forming apparatus that can prevent the short circuit between two input terminals of a power source substrate.SOLUTION: An image forming apparatus (1) comprises a power source substrate (3) that supplies DC voltage to an image forming unit that forms an image on a sheet. The power source substrate has a first input terminal (T1) that is connected to a live side of a commercial power supply and a second input terminal (T2) connected to a neutral side of the commercial power supply, the input terminals arranged on a first principal surface (S1) of the power source substrate, and an AC / DC conversion circuit (31) that converts AC voltage supplied from the commercial power supply through the first input terminal and the second input terminal into DC voltage. A shield plate (32) formed of an insulating member and erected with respect to the first principal surface of the power source substrate is arranged between the first input terminal and the second input terminal.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an image forming apparatus such as a printer. [Background technology]

[0002] Dust and other foreign matter can get inside an image forming device that has a power supply board. If the foreign matter adheres between the two input terminals on the power supply board, it can cause a short circuit or tracking between the two input terminals.

[0003] The AC adapter of Patent Document 1 is provided with a member or a gap to suppress the progression of tracking between the two input power terminals. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-149814 Summary of the Invention [Problem to be solved by the invention]

[0005] However, although the AC adapter of Patent Document 1 can suppress the progression of tracking, it has the problem that it cannot prevent a short circuit between the two input power terminals.

[0006] An object of the present disclosure is to provide an image forming apparatus that can prevent a short circuit between two input terminals of a power supply board. [Means for solving the problem]

[0007] In order to solve the above problem, an image forming apparatus according to one embodiment of the present invention includes an image forming unit that forms an image on a sheet, and a power supply board that supplies a DC voltage to the image forming unit, wherein the power supply board has a first input terminal and a second input terminal arranged on a first main surface of the power supply board, the first input terminal being connected to the live side of a commercial power source and the second input terminal being connected to the neutral side of the commercial power source, and an AC / DC conversion circuit that converts the AC voltage supplied from the commercial power source via the first input terminal and the second input terminal into the DC voltage, and between the first input terminal and the second input terminal is arranged a shielding plate made of an insulating material that stands upright against the first main surface of the power supply board.

[0008] According to the above configuration, even if foreign matter such as dust enters the image forming device, the shielding plate is disposed between the first input terminal and the second input terminal, so that the foreign matter does not adhere across the first input terminal and the second input terminal, thereby preventing a short circuit between the first input terminal and the second input terminal due to the foreign matter entering the image forming device.

[0009] In an image forming apparatus according to one aspect of the present invention, the shielding plate may be composed of two or more panels, and may have a first panel standing between the first input terminal and the second input terminal, and a second panel that forms an L-shape with the first panel when viewed from above the power supply board.

[0010] According to the above configuration, the first face plate can prevent intruding foreign matter from adhering to straddle the space between the first input terminal and the second input terminal.

[0011] In an image forming apparatus according to one aspect of the present invention, the first input terminal and the second input terminal may be arranged on the first main surface at an end of the power supply board, and the second panel may be erected along one side between the first input terminal or the second input terminal and the one side on the end side.

[0012] Foreign matter that has entered the image forming apparatus may bypass the first panel and attach to both the first and second input terminals, causing a short circuit between them. According to the above configuration, by further providing a second panel between the first or second input terminal and one side of the power supply board at its end, foreign matter can be prevented from bypassing the first panel and attaching to both the first and second input terminals. Therefore, a short circuit between the first and second input terminals can be more reliably prevented.

[0013] In an image forming apparatus according to one aspect of the present invention, the AC / DC conversion circuit may be arranged on a second main surface of the power supply board opposite to the first main surface, the power supply board further having a fuse arranged on the second main surface and connected between the first input terminal and the AC / DC conversion circuit, and the second panel may be arranged on the opposite side of the fuse from the first input terminal when viewed from above the power supply board.

[0014] According to the above configuration, the second face plate is disposed on the opposite side of the fuse from the first input terminal, so that a short circuit between the first input terminal and the second input terminal on the opposite side of the fuse can be prevented.

[0015] In one aspect of the image forming apparatus of the present invention, when viewed from above, the power supply board has an L-shaped slit, and when viewed from above, the first panel and the second panel are L-shaped, and each of the first panel and the second panel may be inserted into the slit in a direction from the first main surface toward the second main surface of the power supply board.

[0016] According to the above configuration, the power supply board has an L-shaped slit, and the first and second panel are also L-shaped so that they can be inserted into the slit. By being inserted into the slit, the first and second panel stand upright relative to the first main surface of the power supply board.

[0017] Here, simply placing the first panel and the second panel on the first main surface of the power supply board may result in liquid foreign matter passing through the gap between the first panel or the second panel and the first main surface, spreading onto the first main surface, and causing a short circuit between the two.

[0018] By providing slits in the power supply board and inserting the first and second panels into the slits, the first and second input terminals are completely isolated from each other, preventing the spread of liquid foreign matter between them and reliably preventing short circuits caused by liquid foreign matter.

[0019] Furthermore, since the shielding plate is inserted into the L-shaped slit, the shielding plate can be stably installed upright on the surface of the power supply board.

[0020] In an image forming apparatus according to one aspect of the present invention, each of the first panel and the second panel may have a folded portion formed at each end protruding from the slit on the second main surface side of the power supply board, the folded portion being folded back toward the second main surface.

[0021] According to the above configuration, a folded portion is formed at the end of the shielding plate, which is folded back toward the second main surface of the power supply board, making it difficult for the shielding plate to come off the power supply board, and the shielding plate can be stably erected on the surface of the power supply board.

[0022] In an image forming apparatus according to one aspect of the present invention, the shielding plate may further include a third panel parallel to the first main surface of the power supply board, and the third panel may abut against an end portion of each of the first panel and the second panel opposite to the end portion on the first main surface side.

[0023] According to the above configuration, the shielding plate further has a third surface plate parallel to the surface of the power supply board, which further prevents a short circuit between the first input terminal and the second input terminal caused by a foreign object. [Effects of the Invention]

[0024] According to one aspect of the present invention, it is possible to provide an image forming apparatus that can prevent a short circuit between two input terminals of a power supply board. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a cross-sectional view showing a schematic configuration of an image forming apparatus. [Figure 2] FIG. 2 is a block diagram showing the electrical configuration of the image forming apparatus. [Figure 3] 1 is a diagram showing an outline of the internal configuration of an image forming apparatus as viewed from above; [Figure 4] 3A and 3B are diagrams showing the appearance of a first main surface and a second main surface of a power supply substrate. [Figure 5] 10A and 10B are diagrams showing the shielding plate and slits of the power supply board. DETAILED DESCRIPTION OF THE INVENTION

[0026] An embodiment of the present invention will be described in detail below. For ease of explanation, the same components are denoted by the same reference numerals, and the names and functions of the components are also the same. Therefore, detailed description thereof will not be repeated.

[0027] (Configuration of image forming apparatus 1) Fig. 1 is a cross-sectional view showing a schematic configuration of image forming apparatus 1. In Fig. 1, the right side of the paper is the front side of image forming apparatus 1, and for a user looking at image forming apparatus 1 from the front side, the back side of the paper is the right-hand side and the front side of the paper is the left-hand side.

[0028] The image forming apparatus 1 is, for example, a laser printer that uses toner to form an image on a sheet S. Furthermore, although a monochrome printer that performs image formation processing for a monochrome image is exemplified as the image forming apparatus 1, the image forming apparatus 1 is not limited to this and may be, for example, a color printer that performs image formation processing for a full-color image.

[0029] As shown in FIG. 1, the image forming apparatus 1 includes a housing 2, a paper feed unit 20, an image forming unit 4, discharge rollers 5, and a discharge tray 7. The housing 2 constitutes the outer container of the image forming apparatus 1 and houses the main components of the image forming apparatus 1. The paper feed unit 20 supplies a sheet S toward registration rollers 21. The sheet S is a recording medium, and is paper, on which an image formation process is performed. The registration rollers 21 align the leading edge of the sheet S supplied from the paper feed unit 20, and then transport the sheet S toward the image forming unit 4.

[0030] The image forming unit 4 forms an image by performing an image forming process on the sheet S fed by the paper feed unit 20. The image forming unit 4 includes an exposure unit 10, a transfer unit 19, a charging unit 18, a developing unit 13, a fixing unit 6, a photosensitive drum 17, and a high-voltage power supply board 8 (see FIG. 2).

[0031] The exposure unit 10 includes a laser light source (not shown), a polygon mirror 11, and a reflecting mirror 12. The polygon mirror 11 is a rotating polygonal mirror with six reflecting surfaces on the side surfaces of a regular hexagonal prism. The polygon mirror 11 deflects the light beam LB emitted by the laser light source in a direction toward the photosensitive drum 17.

[0032] The exposure unit 10 deflects a light beam LB using a polygon mirror 11, and emits the light beam LB from the polygon mirror 11 to the surface of the photosensitive drum 17 via a reflecting mirror 12. The exposure unit 10 scans the surface of the photosensitive drum 17 with the light beam LB to expose the photosensitive drum 17. As a result, an electrostatic latent image that constitutes a toner image is formed on the photosensitive drum 17.

[0033] The transfer unit 19 includes a transfer roller that sandwiches the sheet S between itself and the photosensitive drum 17, and transfers the toner image from the photosensitive drum 17 to the sheet S. The charging unit 18 is, for example, a scorotron charger having a charging wire and a grid unit (not shown). In the charging unit 18, a charging voltage is applied to the charging wire by a high-voltage power supply board 8, and a grid voltage is applied to the grid unit, thereby generating a corona discharge and uniformly charging the surface of the photosensitive drum 17. The developing unit 13 includes a developing roller 14 and a toner cartridge 15 that contains toner.

[0034] In the image forming unit 4, the surface of the photosensitive drum 17 is uniformly charged by the charging unit 18, and then an electrostatic latent image based on the print data is formed on the surface of the photosensitive drum 17 by a light beam LB from the exposure unit 10. In addition, the developing roller 14 supplies toner from inside the toner cartridge 15 to the surface of the photosensitive drum 17 on which the electrostatic latent image has been formed.

[0035] As a result, the electrostatic latent image is made visible, and a toner image is formed on the surface of the photosensitive drum 17. Thereafter, the sheet S fed from the paper feed unit 20 is transported to a transfer position between the photosensitive drum 17 and the transfer unit 19, whereby the toner image formed on the surface of the photosensitive drum 17 is transferred onto the sheet S.

[0036] The sheet S onto which the toner image has been transferred is transported to the fixing unit 6 by the photosensitive drum 17 and the transfer unit 19. The fixing unit 6 includes a heating roller 22 having a heater and a pressure roller 23, and fixes the toner image formed on the sheet S. Specifically, the fixing unit 6 thermally fixes the toner image on the sheet S transported from the photosensitive drum 17 and the transfer unit 19.

[0037] The sheet S on which the toner image has been thermally fixed is discharged onto a discharge tray 7 by a discharge roller 5. Note that the power supply board 3 is shown schematically in FIG.

[0038] 2 is a block diagram showing the electrical configuration of the image forming apparatus 1. As shown in FIG. 2, the image forming apparatus 1 includes a main board MK, a power supply board 3, and an image forming unit 4.

[0039] The main board MK includes an ASIC with a CPU, a ROM, a RAM, and an application circuit MK1.

[0040] The CPU of the ASIC controls the image forming unit 4 and other components in accordance with the control program read from the ROM, while storing the processing results in the RAM. The ROM stores the programs executed by the CPU of the ASIC. The RAM is used as a working area from which various control programs are read, or as a storage area for temporarily storing data.

[0041] One terminal of the commercial power supply P is connected to the first input terminal T1, and the other terminal of the commercial power supply P is connected to the second input terminal T2. The AC / DC conversion circuit 31 on the power supply board 3 receives AC voltage from the commercial power supply P, converts the AC voltage to a DC voltage of 24 V, and supplies the DC voltage to the application circuit MK1 on the main board MK.

[0042] The application circuit MK1 is a circuit that supplies power supplied from the power supply board 3 to the high-voltage power supply board 8 of the image forming unit 4, the photosensitive drum 17, the exposure unit 10, and the fixing unit 6. The application circuit MK1 converts a DC voltage of 24 V to 3.3 V and supplies the DC voltage of 24 V as is to the image forming unit 4. The DC voltage supplied to the photosensitive drum 17, the exposure unit 10, and the fixing unit 6 is used as a voltage to drive each of them.

[0043] The high-voltage power supply board 8 receives a 24V DC voltage from the application circuit MK1, boosts the DC voltage, and supplies a high voltage of 8KV or the like to the charging unit 18, the developing unit 13, and the transfer unit 19.

[0044] In FIG. 3, the position where the power supply board 3 is disposed inside the housing 2 is clearly shown.

[0045] 3(A) is a diagram showing the general internal configuration of image forming apparatus 1 as viewed from above. Image forming apparatus 1 includes an image forming unit 4 that forms an image on a sheet S, and a power supply board 3 that supplies DC voltage to image forming unit 4. Image forming unit 4 includes a fixing unit 6, a photosensitive drum 17, etc. Furthermore, image forming apparatus 1 includes a main board MK, a resin frame JF, drive system members KB such as a clutch and gears, two sheet metal frames BF, and a fan FN.

[0046] The fixing unit 6 and the photosensitive drum 17 are axially supported between two sheet metal frames BF, and are rotationally driven by a driving system member KB.

[0047] Above the power supply board 3, that is, on the front side of the power supply board 3 as viewed from the paper, a high-voltage power supply board 8 (see FIG. 2) is disposed.

[0048] (Power supply board 3) As shown in FIG. 3(A), the power supply board 3 is installed between the right side surface of the housing 2 of the image forming apparatus 1 and the sheet metal frame BF. The power supply board 3 is a low-voltage power supply board that outputs a DC voltage, such as 24 V. The power supply board 3 is supplied with an AC voltage from a commercial power source P via a power plug PLG and power cables PCL and PCN. The power cable PCL is not shown in FIG. 3 but is shown in FIGS. 4 and 5. The power supply board 3 converts the AC voltage supplied from the commercial power source P into a DC voltage and supplies the DC voltage to the main circuit board MK, the high-voltage power supply board 8 (see FIG. 2), etc. The power supply board 3, including the AC / DC conversion circuit 31, is housed in an enclosure EC. The enclosure EC is further housed in the housing 2.

[0049] Fig. 3(B) is an enlarged view of the power supply substrate 3 of Fig. 3(A). A first input terminal T1 and a second input terminal T2 (not shown) are arranged on a first main surface S1 of the power supply substrate 3, which is the surface opposite to a second main surface S2 on which the AC / DC conversion circuit 31 is arranged.

[0050] The commercial power supply P supplies AC voltage from two electrodes L and N. The electrode N on the grounded side is the "neutral side," and the electrode L on the ungrounded side is the "live side." When a power plug PLG is inserted into the two electrodes L and N of the commercial power supply P, a wiring PCL is connected to the electrode L on the ungrounded side of the commercial power supply P, and a wiring PCN is connected to the electrode N on the grounded side of the commercial power supply P.

[0051] Fig. 3(B) shows that the termination portion PCN1 of the wiring PCN penetrates the power supply substrate 3 and is soldered and connected to a second input terminal T2 arranged on the first main surface S1 of the power supply substrate 3. Although not shown in Fig. 3(B), the termination portion PCL1 of the wiring PCL penetrates the power supply substrate 3 and is soldered and connected to a first input terminal T1 arranged on the first main surface S1 of the power supply substrate 3.

[0052] A shielding plate 32 is installed between the first input terminal T1 and the second input terminal T2, the details of which will be described with reference to FIGS.

[0053] 4A and 4B are diagrams showing the appearance of the first main surface S1 and the second main surface S2 of the power supply board 3. FIG. 4A is a schematic diagram of the first main surface S1 of the power supply board 3. FIG. 4B is a perspective view of the second main surface S2 of the power supply board 3. FIG. 4C is a perspective view of the first main surface S1 of the power supply board 3.

[0054] 4(A), the power supply substrate 3 has a first input terminal T1, a second input terminal T2, an AC / DC conversion circuit 31, and a fuse FS. The first input terminal T1 and the second input terminal T2 are arranged on a first main surface S1 of the power supply substrate 3. Meanwhile, the AC / DC conversion circuit 31 and the fuse FS are arranged on a second main surface S2 of the power supply substrate 3. The first main surface S1 is the back surface of the power supply substrate 3. The second main surface S2, which is opposite to the first main surface S1, is the front surface of the power supply substrate 3.

[0055] The first input terminal T1 and the second input terminal T2 are arranged at an end 33 of the power supply board 3. The first input terminal T1 is a live terminal connected to an electrode L on the live side of the commercial power supply P. The second input terminal T2 is a neutral terminal connected to an electrode N on the neutral side of the commercial power supply P.

[0056] The AC / DC conversion circuit 31 converts the AC voltage supplied from the commercial power supply P via the first input terminal T1 and the second input terminal T2 into a DC voltage. The AC / DC conversion circuit 31 has a rectifier diode 311, an electrolytic capacitor 312, a transformer 313, and a control IC 314. The rectifier diode 311 converts the AC voltage supplied from the commercial power supply P into a DC voltage. The electrolytic capacitor 312 smoothes the DC voltage output from the rectifier diode 311, converts it into a constant DC voltage, and supplies it to the transformer 313. The transformer 313 converts the DC voltage supplied from the electrolytic capacitor 312 into a 24 V DC voltage. The control IC 314 controls the entire AC / DC conversion circuit 31.

[0057] The fuse FS is connected between the first input terminal T1 and the AC / DC conversion circuit 31. The fuse FS prevents an abnormal current from flowing from the first input terminal T1 to the AC / DC conversion circuit 31.

[0058] (Shielding plate 32) 4(B) and 4(C), a shielding plate 32 is disposed between the first input terminal T1 and the second input terminal T2. The shielding plate 32 is made of a flame-retardant and insulating material, and is provided upright on the first main surface S1 of the power supply board 3.

[0059] Shielding plate 32 is made up of two or more face plates. In the example of FIG. 4, shielding plate 32 is made up of first face plate 321, second face plate 322, and third face plate 323.

[0060] (1st face plate 321) The first face plate 321 is erected between the first input terminal T1 and the second input terminal T2. More specifically, the first face plate 321 shields the second input terminal T2 from the first input terminal T1 to the connection terminal on the end 33 side of the connection terminals on both ends of the fuse FS.

[0061] By using the first panel 321 to shield the first input terminal T1 and the second input terminal T2, it is possible to prevent a short circuit between the first input terminal T1 and the second input terminal T2 due to a foreign object.

[0062] Furthermore, the fuse FS prevents a large current from flowing from the first input terminal T1 to the AC / DC conversion circuit 31. Therefore, by using the first face plate 321 to shield the area from the first input terminal T1 to the connection terminal FS1 on the end 33 side of the fuse FS, it is possible to prevent a short circuit between the first input terminal T1 and the second input terminal T2. If the second input terminal T2 were shielded from the first input terminal T1, the distance D2 from the second input terminal T2 to the rectifier diode 311 would be longer than the distance D1 from the first input terminal T1 to the connection terminal FS1 on the end 33 side of the fuse FS, resulting in poor efficiency.

[0063] (2nd face plate 322) The second panel 322 forms an L-shape with the first panel 321 when viewed from above the power supply board 3. The second panel 322 stands between the first input terminal T1 and a side 35 on the first main surface S1 of the power supply board 3 that is closer to the end 33, and extends along the side 35. In other words, the second panel 322 is disposed on the end 33 side of the first input terminal T1, and stands parallel to the side 35 on the end 33 side. This makes it possible to prevent a short circuit between the first input terminal T1 and the second input terminal T2 that occurs by bypassing the side 35 on the end 33 side.

[0064] When viewed from above, the second face plate 322 is disposed on the opposite side of the first input terminal T1 from the fuse FS.

[0065] The second panel 322 may be provided upright along the side 35 between the second input terminal T2 and the side 35 on the end 33 side.

[0066] The shielding plate 32 does not surround the first input terminal T1 on all four sides. As shown in the upper diagram of Figure 4, a discharge gap GP is provided on the power supply board 3 below the first input terminal T1 in the drawing, making it difficult to place the shielding plate 32 on the discharge gap GP side. Also, a fuse FS is provided on the power supply board 3 to the left of the first input terminal T1 in the drawing, making it difficult to place the shielding plate 32 on the fuse FS side.

[0067] Since the first panel 321 and the second panel 322 partially surround the first input terminal T1, the number of components of the shielding plate 32 is reduced and the size of the shielding plate 32 is smaller than when the first input terminal T1 and the second input terminal T2 are entirely covered.

[0068] (3rd face plate 323) The third panel 323 is a top panel that is parallel to the first main surface S1 of the power supply board 3.

[0069] Fig. 5 is a diagram showing the shielding plate 32 and the slits 34 of the power supply board 3. As shown in Fig. 5(B), the third panel 323 abuts against an end 3212 of the first panel 321 that is opposite to the end 3211 on the second main surface S2 side.

[0070] As shown in FIG. 5(C), the third panel 323 abuts against an end 3222 of the second panel 322 opposite to the end 3221 on the second main surface S2 side.

[0071] Various methods can be used to manufacture the shielding plate 32 having three face plates. For example, a single sheet may be cut into an L-shape and then bent at right angles in two places to form the shielding plate 32. Alternatively, three face plates may be prepared separately and then fixed so that they abut against each other to form the shielding plate 32.

[0072] By providing not only the first panel 321 and the second panel 322 but also the third panel 323, it is possible to prevent a long foreign object from going over the upper end of the first panel 321 or the second panel 322, causing a short circuit between the first input terminal T1 and the second input terminal T2.

[0073] (Slit 34) 5(A), when viewed from above, the power supply board 3 has an L-shaped slit 34. When viewed from above, the first face plate 321 and the second face plate 322 of the shielding plate 32 are also L-shaped. Each of the first face plate 321 and the second face plate 322 is inserted into the slit 34 in a direction from the first main surface S1 toward the second main surface S2 of the power supply board 3.

[0074] It is sufficient that the L-shape of the slit 34 and the L-shape formed by the first panel 321 and the second panel 322 are both shapes that can be said to be substantially L-shaped. In other words, the L-shape does not necessarily have to be a shape that forms a right angle, and may be a shape that forms an acute angle or an obtuse angle.

[0075] By using the first panel 321 and the second panel 322, which penetrate from the first main surface S1 side to the second main surface S2 side of the power supply board 3, to shield the first input terminal T1 and the second input terminal T2, there is no gap between the first main surface S1 and the lower ends of the first panel 321 and the second panel 322, so that a short circuit between the first input terminal T1 and the second input terminal T2 can be reliably prevented.

[0076] (Folded portions 324, 325 of the shielding plate 32) As shown in Figure 5(B), the first panel 321 of the shielding plate 32 has a folded portion 324 formed on the second main surface S2 side of the power supply board 3 at the end 3211 protruding from the slit 34, which is folded back toward the second main surface S2.

[0077] Also, as shown in Figure 5(C), the second panel 322 of the shielding plate 32 has a folded portion 325 formed on the second main surface S2 side of the power supply board 3 at the end 3221 protruding from the slit 34, which is folded back toward the second main surface S2.

[0078] At the ends 3211, 3221 of the shielding plate 32, folded portions 324, 325 are formed, respectively, which are folded back toward the second main surface S2 of the power supply board 3, so that the shielding plate 32 is less likely to come off the power supply board 3 toward the first main surface S1, and therefore the shielding plate 32 can be stably erected on the surface of the power supply board 3.

[0079] The present disclosure is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present disclosure. [Explanation of symbols]

[0080] 1. Image forming device 32 Shielding plate 3 Power Supply Board 4 Image forming unit 31 AC / DC conversion circuit 34 Slit 33, 3211, 3212, 3221, 3222 End 321 First face plate 322 Second face plate 323 Third face plate S1 First principal surface S2 2nd main surface T1 First input terminal T2 Second input terminal

Claims

1. an image forming unit that forms an image on a sheet; a power supply board for supplying a DC voltage to the image forming unit; Equipped with The power supply board includes: a first input terminal and a second input terminal arranged on a first main surface of the power supply board, the first input terminal being connected to a live side of a commercial power supply and the second input terminal being connected to a neutral side of the commercial power supply; an AC / DC conversion circuit that converts an AC voltage supplied from the commercial power supply via the first input terminal and the second input terminal into the DC voltage; and a shielding plate made of an insulating material and including two or more face plates standing on the first main surface of the power supply board is disposed between the first input terminal and the second input terminal; The shielding plate is a first face plate provided upright between the first input terminal and the second input terminal; a second face plate that is L-shaped with the first face plate when viewed from above the power supply board, an image forming apparatus characterized in that the first panel and the second panel shield the first input terminal or the second input terminal in two mutually perpendicular directions, and open the remaining two directions;

2. an image forming unit that forms an image on a sheet; a power supply board for supplying a DC voltage to the image forming unit; Equipped with The power supply board includes: a first input terminal and a second input terminal arranged on a first main surface of the power supply board, the first input terminal being connected to a live side of a commercial power supply and the second input terminal being connected to a neutral side of the commercial power supply; an AC / DC conversion circuit that converts an AC voltage supplied from the commercial power supply via the first input terminal and the second input terminal into the DC voltage; and a shielding plate made of an insulating material and including two or more face plates standing on the first main surface of the power supply board is disposed between the first input terminal and the second input terminal; The shielding plate is a first face plate provided upright between the first input terminal and the second input terminal; the power supply board has the first face plate and a second face plate that is L-shaped when viewed from above, the first input terminal and the second input terminal are disposed on the first main surface at an end of the power supply substrate, The second face plate is erected along one side of the end portion between the first input terminal or the second input terminal and the one side of the end portion. An image forming apparatus characterized by:

3. the AC / DC conversion circuit is disposed on a second main surface of the power supply substrate opposite to the first main surface, the power supply substrate further includes a fuse disposed on the second main surface and connected between the first input terminal and the AC / DC conversion circuit; When viewed from above, the second face plate is disposed on the opposite side of the first input terminal from the fuse.

3. The image forming apparatus according to claim 2, wherein the image forming apparatus is a recording medium.

4. When viewed from above, the power supply board has an L-shaped slit, When viewed from above, the first face plate and the second face plate are L-shaped, Each of the first face plate and the second face plate is inserted into the slit in a direction from the first main surface toward the second main surface of the power supply board.

4. The image forming apparatus according to claim 3, wherein the image forming apparatus is a recording medium.

5. Each of the first face plate and the second face plate includes: On the second main surface side of the power supply substrate, each end protruding from the slit has a folded portion folded back toward the second main surface.

5. The image forming apparatus according to claim 4.

6. the shielding plate further includes a third plate parallel to the first main surface of the power supply board, The third panel abuts against the end portions of the first panel and the second panel opposite to the end portions on the first main surface side.

6. The image forming apparatus according to claim 2, wherein the image forming apparatus is a recording medium.

Images