JP2017076725A - Power supply device and image forming device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device capable of more properly supplying power.SOLUTION: A power supply device 31 includes a power supply substrate 32, an electrolytic capacitor 33, a shield 34, a windmill portion 35, and an AC switch 36. The electrolytic capacitor 33 is provided so as to protrude in the plate thickness direction of the power supply substrate 32. The electrolytic capacitor 33 has an explosion-proof valve 39 for preventing explosion at the top portion 37 thereof, and is configured so that electrolytic solution is ejected from the top portion 37 under explosion. The shield 34 has an opening 43 at a position facing the top portion 37 of the electrolytic capacitor 33, and covers the electrolytic capacitor 33. The windmill portion 35 is provided in the opening portion 43, disposed so as to the top portion 37, and rotated by ejection pressure of the electrolytic solution, and contains plural vane portions 46a To 46d between which slits 45 are formed. An AC switch 36 interrupts connection of a pattern circuit 40 in accordance with the rotation of the vane portions 46a to 46d.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a power supply device and an image forming apparatus.

  In an image forming apparatus typified by a multifunction peripheral or the like, after an image of a document is read by an image reading unit, light is irradiated on the photoconductor provided in the image forming unit based on the read image, An electrostatic latent image is formed on the surface. Thereafter, a developer such as charged toner is supplied onto the formed electrostatic latent image to form a visible image, which is then transferred to a sheet, fixed by a fixing device provided in the image forming apparatus, and discharged outside the apparatus. .

  In an image forming apparatus, a power supply device that supplies electric power from the outside into the image forming apparatus may be provided. Some of these power supply devices are provided with electrolytic capacitors. Techniques relating to electrolytic capacitors are disclosed in Japanese Utility Model Laid-Open No. 61-79533 (Patent Document 1) and Japanese Patent Application Laid-Open No. 2006-156546 (Patent Document 2).

Japanese Utility Model Publication No. 61-79533 JP 2006-156546 A

  According to Patent Document 1, a part of the case encapsulating the electrolytic capacitor body is made weak to form a valve to be an explosion-proof valve. Then, mechanical fluctuations of the valve are detected, and energization to the electrolytic capacitor is interrupted or alarmed. However, such a configuration requires a mechanism for detecting minute mechanical fluctuations of the electrolytic capacitor, which may complicate the device configuration.

  According to Patent Document 2, an electrolytic capacitor having an explosion-proof valve is covered with a cutoff device or a cap. However, with such a configuration, during normal operation, the heat released from the electrolytic capacitor is insufficiently discharged, and there is a possibility that a problem due to a rise in the temperature of the electrolytic capacitor may occur.

  The objective of this invention is providing the power supply device which can supply electric power more appropriately.

  Another object of the present invention is to provide an image forming apparatus capable of forming an image more appropriately.

  In one aspect of the present invention, the power supply device is a power supply device that supplies power to a predetermined device. The power supply device includes a power supply board, an electrolytic capacitor, a shield, a windmill unit, and an AC switch. A pattern circuit for supplying power is assembled on the power supply board. The electrolytic capacitor is connected to the pattern circuit. The electrolytic capacitor is provided so as to protrude in the thickness direction of the power supply substrate. The electrolytic capacitor has an explosion-proof valve at its top to prevent the explosion, and is configured so that the electrolytic solution is ejected from the top at the time of the explosion. The shield is provided with an opening at a position facing the top of the electrolytic capacitor and covers the electrolytic capacitor. A windmill part is provided in the opening part, is arrange | positioned in the position facing a top part, rotates with the pressure of the ejection of electrolyte solution, and contains the some blade | wing part by which a slit is formed among each. The AC switch cuts off the connection of the pattern circuit according to the rotation of the blade portion.

  In another aspect of the present invention, an image forming apparatus includes a power supply device that supplies power, and an image forming unit that drives the power supplied from the power supply device as a drive source to form an image. The power supply device includes a power supply board, an electrolytic capacitor, a shield, a windmill unit, and an AC switch. A pattern circuit for supplying power is assembled on the power supply board. The electrolytic capacitor is connected to the pattern circuit. The electrolytic capacitor is provided so as to protrude in the thickness direction of the power supply substrate. The electrolytic capacitor has an explosion-proof valve at its top to prevent the explosion, and is configured so that the electrolytic solution is ejected from the top at the time of the explosion. The shield is provided with an opening at a position facing the top of the electrolytic capacitor and covers the electrolytic capacitor. A windmill part is provided in the opening part, is arrange | positioned in the position facing a top part, rotates with the pressure of the ejection of electrolyte solution, and contains the some blade | wing part by which a slit is formed among each. The AC switch cuts off the connection of the pattern circuit according to the rotation of the blade portion.

  According to such a power supply device, in the electrolytic capacitor covered with the shield, the opening is provided in the shield, and the slit is formed between the blades, so that the electrolytic capacitor is discharged through the slit. Heat can be discharged. In addition, when the explosion-proof valve of the electrolytic capacitor is opened and the electrolytic solution is ejected, the blade portion of the windmill portion rotates according to the ejection of the electrolytic solution. Then, the electromotive force generated in response to this rotation activates the AC switch and interrupts energization to the pattern circuit. Therefore, the power supply to the power supply board can be safely interrupted. As a result, such a power supply device can supply electric power more appropriately.

  In addition, according to such an image forming apparatus, power can be supplied more appropriately, so that an image can be formed more appropriately.

1 is a schematic diagram illustrating an external appearance of a multifunction peripheral when an image forming apparatus including a power supply device according to an embodiment of the present invention is applied to the multifunction peripheral. FIG. 2 is a block diagram illustrating a configuration of the multifunction machine illustrated in FIG. 1. It is a schematic sectional drawing which shows a part of power supply device with which a multifunction machine is equipped. It is the figure which looked at the power supply device shown in FIG. 3 from the direction of arrow IV in FIG. It is a schematic perspective view which shows a part of electrolytic capacitor contained in a power supply device. It is a figure which shows the state which the electrolyte solution ejected.

  Embodiments of the present invention will be described below. FIG. 1 is a schematic diagram showing an external appearance of a multifunction peripheral when an image forming apparatus including a power supply device according to an embodiment of the present invention is applied to the multifunction peripheral. FIG. 2 is a block diagram showing the configuration of the multifunction device when applied to the multifunction device shown in FIG.

  Referring to FIGS. 1 and 2, the multifunction machine 11 includes a control unit 12, an operation unit 13, an image reading unit 14, an image forming unit 15, a paper setting unit 19, a main body unit 20, and a discharge tray. 30, a power supply device 31, a hard disk 16 as a storage unit, a facsimile communication unit 17, and a network interface unit 18 for connecting to a network 25.

  The control unit 12 controls the entire multifunction machine 11. The operation unit 13 includes a display screen 21 that displays information transmitted from the multifunction peripheral 11 side and user input contents. The operation unit 13 inputs image forming conditions such as the number of copies to be printed and gradation, and power on / off. The image reading unit 14 includes an ADF (Auto Document Feeder) 22 as a document transport device that transports a document set at the set position to the read position. The image reading unit 14 reads an image of a document set on the ADF 22 or a mounting table (not shown). The paper setting unit 19 includes a manual feed tray 28 for manually setting paper and a paper feed cassette group 29 that can store a plurality of different sizes of paper. The paper setting unit 19 sets paper to be supplied to the image forming unit 15. The image forming unit 15 forms an image on the sheet conveyed from the sheet setting unit 19 based on the image read by the image reading unit 14 and the image data transmitted via the network 25. The sheet on which the image is formed by the image forming unit 15 is discharged to the discharge tray 30. The image forming unit 15 is disposed on the inner side of the main body unit 20. The hard disk 16 stores transmitted image data, input image forming conditions, and the like. The facsimile communication unit 17 is connected to the public line 24 and performs facsimile transmission and facsimile reception. The power supply device 31 supplies power from the outside to each unit in the multifunction machine 11 via the main body unit 20. The image forming unit 15 is driven using power from the power supply device 31 as a drive source.

  The multi-function device 11 includes a DRAM (Dynamic Random Access Memory) for writing and reading image data, and the illustration and description thereof are omitted. In addition, arrows in FIG. 2 indicate the flow of data regarding control signals, control, and images. As shown in FIG. 1, in this embodiment, the sheet cassette group 29 includes three sheet cassettes 23a, 23b, and 23c.

  The multifunction device 11 operates as a copying machine by forming an image in the image forming unit 15 using the image data of the document read by the image reading unit 14. Further, the multifunction machine 11 forms an image in the image forming unit 15 and prints it on a sheet using the image data transmitted from the computers 26a, 26b, and 26c connected to the network 25 through the network interface unit 18. It operates as a printer. That is, the image forming unit 15 operates as a printing unit that prints the requested image. The MFP 11 uses the image data transmitted from the public line 24 through the facsimile communication unit 17 to form an image in the image forming unit 15 via the DRAM and is read by the image reading unit 14. The image data of the original is transmitted to the public line 24 through the facsimile communication unit 17, thereby operating as a facsimile apparatus. The multifunction machine 11 has a plurality of functions such as a copying function, a printer function, and a facsimile function regarding image processing. Further, each function has functions that can be set in detail.

  The image forming system 27 including the multifunction peripheral 11 according to an embodiment of the present invention includes the multifunction peripheral 11 having the above-described configuration and a plurality of computers 26a, 26b, and 26c connected to the multifunction peripheral 11 via the network 25. Prepare. In this embodiment, three computers 26a to 26c are shown. Each of the computers 26 a to 26 c can make a print request to the multi-function peripheral 11 via the network 25 to perform printing.

  Next, the configuration of the power supply device 31 provided in the multifunction machine 11 will be described. FIG. 3 is a schematic cross-sectional view showing a part of the power supply device 31 provided in the multifunction machine 11. 4 is a view of the power supply device 31 shown in FIG. 3 as viewed from the direction of the arrow IV in FIG. FIG. 5 is a schematic perspective view showing a part of the electrolytic capacitor 33 included in the power supply device 31.

  1 to 5, the power supply device 31 includes a power supply substrate 32, an electrolytic capacitor 33, a shield 34, a windmill unit 35, and an AC switch 36. The power supply board 32 is a so-called low-voltage power supply board 32 and is provided with a pattern circuit 40. The power supply board 32 converts an input AC (Alternating Current (AC)) voltage into a DC (Direct Current) voltage and outputs the converted voltage. The power supply device 31 is arranged on the outside side of the multifunction machine 11 so that the power supply board 32 extends in the vertical direction.

  The electrolytic capacitor 33 is a so-called large-capacity electrolytic capacitor 33 and is filled with an electrolytic solution. The electrolytic capacitor 33 has a cylindrical shape and is connected to the pattern circuit 40 by a pair of terminals 38a and 38b extending from the cylindrical bottom portion. Since each of the pair of terminals 38 a and 38 b has a certain degree of rigidity, the electrolytic capacitor 33 is provided so as to rise on the power supply substrate 32. That is, the extending direction of the pair of terminals 38 a and 38 b is provided to be the thickness direction of the power supply substrate 32. An explosion-proof valve 39 is provided at the top 37 of the electrolytic capacitor 33. For example, when an overvoltage is applied in the pattern circuit 40, the explosion-proof valve 39 of the electrolytic capacitor 33 is opened, and the electrolytic solution is ejected.

  Most parts of the electrolytic capacitor 33 and the power supply substrate 32 are covered with a shield 34. The shield 34 includes a rectangular tubular side wall 41 and a bottom wall 42 that covers one end of the side wall 41. The other end portion side of the side wall portion 41 is attached to the power supply substrate 32 side. In the center of the bottom wall portion 42, an opening 43 that is opened in a circular shape is provided.

The windmill portion 35 includes four blade portions 46a, 46b, 46c, and 46d, and a shaft portion 47 to which the four blade portions 46a to 46d are attached. Windmill unit 35 about the shaft portion 47 are four blade portions 46a~46d is rotated configurable in direction or vice versa arrow R ₁ in FIG. Each of the blade portions 46a to 46d is provided to be inclined, and rotates by receiving pressure or wind force from the direction of the arrow IV in FIG. 3 or the opposite direction.

The windmill portion 35 is provided in the opening 43. In FIG. 3, illustration of a part of the shaft portion 47 is omitted. The four blade portions 46a to 46d are attached at intervals of 90 degrees with the shaft portion 47 as the center. Of the opening 43, a gap, that is, a slit 45 is provided between the four blade portions 46 a to 46 d and between the four blade portions 46 a to 46 d and the inner wall 44 of the shield 34 constituting the opening 43. As shown by the broken arrow D ₁ in FIG. 3, the space inside the shield 34 and the space outside the shield 34 are ventilated by the slit 45.

  The AC switch 36 and the power supply board 32 are electrically connected. Specifically, the AC switch 36 is configured to cut off the energization to the pattern circuit 40 of the power supply substrate 32 when the AC switch 36 is turned on when power is input. The AC switch 36 is provided with a solenoid. The AC switch 36 has a so-called solenoid.

  Here, the top portion 37 of the electrolytic capacitor 33 is provided at a position facing the blade portions 46 a to 46 d provided in the opening 43. In FIG. 4, the electrolytic capacitor 33 is indicated by a one-dot chain line. In FIG. 4, specifically, the blade portion 46 b and the top portion 37 of the electrolytic capacitor 33 face each other. Since the explosion-proof valve 39 is provided on the top portion 37, the blade portion 46 b is configured to face the explosion-proof valve 39. The blade portions 46 a to 46 d are configured to be rotatable by the pressure generated by the ejection of the electrolyte from the top portion 37 when an overvoltage is applied to the pattern circuit 40.

Next, a case where an overvoltage is applied to the pattern circuit 40 and the energization to the pattern circuit 40 is interrupted by the AC switch 36 will be described. FIG. 6 is a diagram illustrating a state in which the electrolytic solution is ejected. With reference to FIG. 6, for example, when an overvoltage is applied to the pattern circuit 40, the electrolytic solution is ejected from the top portion 37 of the electrolytic capacitor 33. In this case, open explosion-proof valve 39, the electrolytic solution is ejected in the direction of arrow D ₂ in FIG. Then, a pressure of the jet of the electrolyte, the blade portion 46 a to 46 d, is rotated in the direction indicated by the arrow _{R 1.} An electromotive force is generated by the rotation of the blade portions 46a to 46d. The electromotive force activates the AC switch 36 with a solenoid to cut off the energization to the pattern circuit 40.

  According to such a configuration, in the electrolytic capacitor 33 covered with the shield 34, the opening 34 is provided in the shield 34, and the slit 45 is formed between the blade portions 46a to 46d. Through 45, the heat released from the electrolytic capacitor 33 can be discharged. In addition, when the explosion-proof valve 39 of the electrolytic capacitor 33 is opened and the electrolytic solution is ejected, the blade portions 46a to 46d of the wind turbine unit 35 are rotated according to the ejection of the electrolytic solution. Then, the electromotive force generated in response to this rotation activates the AC switch 36 and interrupts the energization to the pattern circuit 40. Therefore, the power supply to the power supply board 32 can be safely interrupted. As a result, such a power supply device 31 can supply electric power more appropriately.

  Further, the MFP 11 having such a configuration can form an image more appropriately.

  In this case, since the AC switch 36 is operated by the electromotive force generated by the rotation, the energization to the pattern circuit 40 can be more appropriately cut off.

  In the above embodiment, the AC switch 36 is operated by the electromotive force to cut off the energization. However, the present invention is not limited to this, and the rotation of the blade portions 46a to 46d is performed in conjunction with a gear (not shown). By doing so, the AC switch 36 may be operated to cut off the energization to the pattern circuit 40. That is, the AC switch 36 is supplied to the pattern circuit 40 according to at least one of electromotive force generated according to the rotational force of the blade portions 46a to 46d and rotation of the gear interlocked with the rotation of the blade portions 46a to 46d. It is good also as a structure by which electricity supply of is interrupted.

  Further, in the above-described embodiment, the blade portions 46a to 46d themselves may be provided with slits as long as the blade portions 46a to 46d rotate at the pressure of the electrolyte ejection.

  In the above embodiment, the windmill portion 35 includes the four blade portions 46a to 46d. However, the present invention is not limited thereto, and the windmill portion 35 includes at least two or more blade portions. Also good.

  Further, although the AC switch 36 is provided with a solenoid, the present invention is not limited to this, and the AC switch 36 may be configured without a solenoid.

  In the above embodiment, the power supply board 32 is provided so as to extend in the vertical direction. However, the present invention is not limited thereto, and the power supply board 32 is provided so as to extend in the vertical direction, for example. It may be provided or may be provided so as to extend in the horizontal direction.

  In the above embodiment, the power supply device 31 is provided in the multi-function device 11, but is not limited thereto, and may be provided in other electronic device devices.

  It should be understood that the embodiments disclosed herein are illustrative in all respects and are not restrictive in any aspect. The scope of the present invention is defined by the scope of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the scope of the claims.

  The power supply apparatus and the image forming apparatus according to the present invention are particularly effectively used when more appropriate power supply is required.

  11 MFP, 12 control unit, 13 operation unit, 14 image reading unit, 15 image forming unit, 16 hard disk, 17 facsimile communication unit, 18 network interface unit, 19 paper setting unit, 20 main body unit, 21 display screen, 22 ADF 23a, 23b, 23c Paper cassette, 24 Public line, 25 Network, 26a, 26b, 26c Computer, 27 Image forming system, 28 Manual feed tray, 29 Paper feed cassette group, 30 Eject tray, 31 Power supply, 32 Power supply board 33 Electrolytic capacitor, 34 Shield, 35 Windmill, 36 AC switch, 37 Top, 38a, 38b Terminal, 39 Explosion proof valve, 40 Pattern circuit, 41 Side wall, 42 Bottom wall, 43 Opening, 44 Inner wall, 45 Slit 46a, 46b, 4 6c, 46d blade part, 47 shaft part.

Claims (6)

A power supply device for supplying power to a predetermined device,
A power supply board on which a pattern circuit for supplying power is assembled; and
Connected to the pattern circuit, provided so as to protrude in the thickness direction of the power supply substrate, and has an explosion-proof valve at its top to prevent the explosion, so that the electrolyte sprays from the top during the explosion An electrolytic capacitor configured in
An opening is provided at a position facing the top of the electrolytic capacitor, and a shield that covers the electrolytic capacitor;
A windmill part that is provided in the opening, is arranged at a position facing the top, is rotated by the pressure of the spray of the electrolyte, and includes a plurality of blade parts each having a slit formed therein;
An AC switch that cuts off the connection of the pattern circuit according to the rotation of the blade portion. The AC switch cuts off the energization to the pattern circuit in accordance with at least one of an electromotive force generated according to the rotational force of the blade and a rotation of the gear interlocked with the rotation of the blade. The power supply device according to claim 1. The power supply device according to claim 1, wherein the AC switch is provided with a solenoid. The power supply device according to claim 1, wherein an outer shape of the opening is a circle. The power supply device according to claim 1, wherein the power supply board is provided so as to extend in a vertical direction. An image forming apparatus comprising: a power supply device that supplies power; and an image forming unit that drives the power supplied from the power supply device as a drive source and forms an image,
The power supply device
A power supply board on which a pattern circuit for supplying power is assembled; and
Connected to the pattern circuit, provided so as to protrude in the thickness direction of the power supply substrate, and has an explosion-proof valve at its top to prevent the explosion, so that the electrolyte sprays from the top during the explosion An electrolytic capacitor configured in
An opening is provided at a position facing the top of the electrolytic capacitor, and a shield that covers the electrolytic capacitor;
A windmill part that is provided in the opening part and includes a blade part that is arranged at a position facing the top part and is rotated by the pressure of the ejection of the electrolyte;
An image forming apparatus comprising: an AC switch that disconnects the connection of the pattern circuit according to the rotation of the blade portion.

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