JP2012209503A - Wiring processing structure and electronic apparatus including the same - Google Patents

Abstract

The present invention provides a wiring processing structure that can easily process wiring and reduce leakage of electromagnetic waves easily and at low cost, and has a compact configuration and improved assembly workability, and an electronic device including the wiring processing structure.
A line processing guide member (30) is a resin member fixed to a second side plate (22), and a plurality of wiring guides (30a) for preventing the wiring (31) of a power supply board (25a) from lifting and a ferrite core (33) are attached. The core attaching part 33b of the location and the support part 30c which supports the back surface of the power supply board 25a are formed. The ferrite core 33 is cylindrical, and a through hole 33a for inserting the wiring 31 is formed.
[Selection] Figure 4

Description

  The present invention relates to a wiring processing structure used in an electronic apparatus such as an image forming apparatus.

  In an electronic apparatus such as an image forming apparatus, various electronic components are arranged inside the apparatus. In order to electrically connect these electronic components, a connection connector provided in each electronic component and It is common to use a wiring cable provided with connectors for joining at both ends. In the connection method using such a wiring cable, the wiring cable is processed using a resin guide member or a binding band.

  Further, electromagnetic noise is emitted from the wiring cable, and the electromagnetic noise may leak to the outside of the apparatus and affect other electronic devices around the image forming apparatus. In particular, when a wiring cable in which a plurality of conductive wires are integrated in parallel to each other is used, the emission of electromagnetic noise becomes significant.

  Conventionally, as a countermeasure for preventing leakage of electromagnetic wave noise, a method of attaching a ferrite core (magnetic material) to a cord portion of a wiring cable, covering the cord portion with a conductive tape or a metal mesh, or using a leaf spring or the like A method has been adopted in which the electronic component is brought into contact with the apparatus main body to enhance grounding (earth) through the apparatus main body.

  However, since the guide member and binding tool for wiring processing and the member for countermeasures against electromagnetic wave noise are provided separately, the cost increases due to an increase in the number of members. Further, if the ferrite core is simply attached to the wiring, the ferrite core collides with the substrate due to the swinging of the wiring, and the substrate may be damaged.

  Therefore, a configuration in which a wiring processing member and an electromagnetic noise countermeasure member are integrated has been proposed. For example, Patent Document 1 discloses a binding for wiring formed of a resin containing ferrite powder particles as a magnetic material. A tool and a noise removal tool for wiring are disclosed. Patent Document 2 discloses a ferrite core mounting structure in which a flat cable is superimposed on a protruding piece provided on a wiring board and inserted into an insertion hole of a ring-shaped ferrite core.

JP-A-5-254561 JP 2002-43133 A

  However, in the method of Patent Document 1, since the wiring binder and the wiring noise removing tool are formed of a resin containing ferrite powder particles, the cost of the binding tool is increased. Moreover, in the method of patent document 2, since a ferrite core is directly fixed to the protrusion piece part provided in the wiring board, the attachment position of a ferrite core is limited. Therefore, when using multiple types of wiring boards, it is necessary to provide a fixing structure (protruding piece) at a predetermined position on each board, which complicates the structure of the mold for molding the wiring board, and the ferrite core. The tolerance of the mounting position is also reduced.

  In view of the above problems, the present invention includes a wiring processing structure that can easily process wiring, reduce leakage of electromagnetic waves easily and at low cost, and has a compact structure and improved assembly workability, and the same. An object is to provide electronic equipment.

  In order to achieve the above object, the present invention is attached to a frame plate of an electronic device and is fixed to a line processing guide member for positioning a wiring connected to the electronic device body and a core mounting portion of the line processing guide member. And a ferrite core formed with a through-hole through which the wiring is inserted.

  According to the present invention, in the wiring processing structure configured as described above, the ferrite core is disposed so that the through hole penetrates an opening formed in the frame plate.

  According to the present invention, in the wiring processing structure configured as described above, the line processing guide member positions a wiring connected to the substrate attached to the frame plate and the electronic device main body, and supports the substrate. It is also characterized by serving.

  Moreover, this invention is an electronic device provided with the wiring processing structure of the said structure.

  According to the first configuration of the present invention, since the ferrite core for electromagnetic wave noise countermeasure also has a wiring guide function, the number of members can be reduced and the cost can be reduced. In addition, since the ferrite core is fixed to the wire processing guide member, it is not necessary to provide a ferrite core fixing structure on the substrate side, the structure of the mold for molding the substrate is simplified, and the tolerance of the mounting position of the ferrite core is also increased. growing. Further, since the ferrite core does not swing with the wiring, it is possible to reliably prevent the substrate from being damaged due to the collision of the ferrite core.

  According to the second configuration of the present invention, in the wiring processing structure of the first configuration, the ferrite core is arranged so that the through hole penetrates the opening formed in the frame plate. The wire serves as a bush for routing the wiring from the front side to the back side of the frame plate and fixing the wiring to the opening. Therefore, it is possible to prevent the wiring connector from being disconnected or a load being applied to the substrate when the wiring is pulled. Moreover, it becomes low-cost compared with the structure which uses a bush as another member.

  According to the third configuration of the present invention, in the wiring processing structure according to the first or second configuration, the line processing guide member also serves as a support member that supports the substrate, whereby the substrate is spaced from the frame plate. The substrate can be supported separately, and the cooling effect of the substrate is enhanced. Further, since it is not necessary to separately provide a support member for the substrate, the number of members can be reduced.

  Further, according to the fourth configuration of the present invention, by providing the wiring processing structure having any one of the first to third configurations, wiring can be easily processed and leakage of electromagnetic waves can be reduced easily and at low cost. It is possible to obtain an electronic device with a compact configuration and improved assembly workability.

1 is a schematic diagram showing an overall configuration of an image forming apparatus having a wiring processing structure according to the present invention. Side view showing a state where the exterior cover of the image forming apparatus is removed to expose the frame side plate Partial enlarged view of the vicinity of the power supply board 25a in FIG. The perspective view which shows the state which removed the power supply board 25a and exposed the line processing guide member 30 Partial sectional view of the power supply board 25a and the line processing guide member 30 The perspective view which looked at the line processing guide member 30 from the surface side The perspective view which looked at the line processing guide member 30 from the back surface side The fragmentary sectional view which shows the other structural example of the line processing guide member 30 used for the wiring processing structure of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view of an image forming apparatus having a wiring processing structure according to the present invention. Here, a tandem color image forming apparatus is shown. In the main body of the color printer 100, four image forming portions Pa, Pb, Pc, and Pd are sequentially arranged from the upstream side in the transport direction (the right side in FIG. 1). These image forming portions Pa to Pd are provided corresponding to images of four different colors (magenta, cyan, yellow, and black), and magenta, cyan, and yellow are respectively subjected to charging, exposure, development, and transfer processes. And a black image are sequentially formed.

  These image forming portions Pa to Pd are provided with photosensitive drums 1a, 1b, 1c and 1d which carry visible images (toner images) of the respective colors, and are further illustrated by a driving means (not shown). In FIG. 1, an intermediate transfer belt 8 that rotates clockwise is provided adjacent to each of the image forming portions Pa to Pd. The toner images formed on the photosensitive drums 1a to 1d are sequentially primary-transferred and superimposed on the intermediate transfer belt 8 that moves while contacting the photosensitive drums 1a to 1d, and then the secondary transfer roller. 9 is secondarily transferred onto a transfer paper P as an example of a recording medium, and further fixed on the transfer paper P in the fixing unit 13 and then discharged from the apparatus main body. An image forming process for each of the photosensitive drums 1a to 1d is executed while rotating the photosensitive drums 1a to 1d counterclockwise in FIG.

  The transfer paper P onto which the toner image is transferred is accommodated in a paper cassette 16 disposed at the lower part of the main body of the color printer 100, and is connected to the secondary transfer roller 9 and a later-described roller via a paper feed roller 12a and a registration roller pair 12b. The intermediate transfer belt 8 is conveyed to a nip portion with the driving roller 11. A sheet made of dielectric resin is used for the intermediate transfer belt 8, and a (seamless) belt having no seam is mainly used. Further, a blade-like belt cleaner 19 for removing toner remaining on the surface of the intermediate transfer belt 8 is disposed on the downstream side of the secondary transfer roller 9.

  Next, the image forming units Pa to Pd will be described. There are chargers 2a, 2b, 2c, and 2d for charging the photosensitive drums 1a to 1d and image information on the photosensitive drums 1a to 1d around and below the photosensitive drums 1a to 1d that are rotatably arranged. The exposure device 5 for exposing the toner, the developing devices 3a, 3b, 3c and 3d for forming toner images on the photosensitive drums 1a to 1d, and the developer (toner) remaining on the photosensitive drums 1a to 1d are removed. Cleaning parts 7a, 7b, 7c and 7d are provided.

  When image data is input from a host device such as a personal computer, first, the surfaces of the photosensitive drums 1a to 1d are uniformly charged by the chargers 2a to 2d, and then light is irradiated according to the image data by the exposure device 5. The electrostatic latent images corresponding to the image data are formed on the respective photosensitive drums 1a to 1d. Each of the developing devices 3a to 3d is filled with a predetermined amount of a two-component developer containing toner of each color of magenta, cyan, yellow, and black. In addition, when the ratio of the toner in the two-component developer filled in each developing device 3a to 3d falls below a specified value due to the formation of a toner image described later, each developing device 3a to 3d is transferred from the toner container 4a to 4d. Toner is replenished. The toner in the developer is supplied onto the photosensitive drums 1a to 1d by the developing devices 3a to 3d and electrostatically adheres to the electrostatic latent image formed by the exposure from the exposure device 5. A toner image is formed.

  The primary transfer rollers 6a to 6d apply an electric field at a predetermined transfer voltage between the primary transfer rollers 6a to 6d and the photosensitive drums 1a to 1d, and magenta, cyan, yellow, and yellow on the photosensitive drums 1a to 1d. A black toner image is primarily transferred onto the intermediate transfer belt 8. These four color images are formed with a predetermined positional relationship predetermined for forming a predetermined full-color image. Thereafter, in preparation for the subsequent formation of a new electrostatic latent image, the toner remaining on the surfaces of the photosensitive drums 1a to 1d after the primary transfer is removed by the cleaning units 7a to 7d.

  The intermediate transfer belt 8 is stretched over an upstream driven roller 10 and a downstream drive roller 11, and the intermediate transfer belt 8 rotates clockwise as the drive roller 11 is rotated by a drive motor (not shown). When the rotation starts, the transfer paper P is conveyed from the registration roller 12b to a nip portion (secondary transfer nip portion) between the driving roller 11 and the secondary transfer roller 9 provided adjacent thereto at a predetermined timing. The full color image on the intermediate transfer belt 8 is transferred onto the transfer paper P. The transfer paper P onto which the toner image is transferred is conveyed to the fixing unit 13.

  The transfer paper P conveyed to the fixing unit 13 is heated and pressed by the fixing roller pair 13a to fix the toner image on the surface of the transfer paper P, and a predetermined full-color image is formed. The transfer paper P on which the full-color image is formed is distributed in the transport direction by the branching portion 14 that branches in a plurality of directions. When an image is formed on only one side of the transfer paper P, it is discharged as it is onto the discharge tray 17 by the discharge roller pair 15.

  On the other hand, when forming images on both sides of the transfer paper P, the transfer paper P that has passed through the fixing unit 13 is once transported in the direction of the discharge roller pair 15 and discharged after the trailing edge of the transfer paper P has passed through the branching unit 14. By rotating the roller pair 15 in the reverse direction and switching the conveyance direction of the branching section 14, the transfer paper P is distributed from the rear end of the transfer paper P to the paper conveyance path 18, and is re-conveyed to the secondary transfer nip portion with the image surface reversed. Is done. Then, after the next image formed on the intermediate transfer belt 8 is transferred by the secondary transfer roller 9 to the surface of the transfer paper P where the image is not formed and conveyed to the fixing unit 13 to fix the toner image. , And discharged to the discharge tray 17.

  FIG. 2 is a side view showing a state in which the frame side plate is exposed by removing the exterior cover of the image forming apparatus in FIG. As shown in FIG. 2, the frame side plate 20 disposed on the back side (front side in the figure) of the image forming apparatus 100 main body includes a first side plate 21 disposed on the upper side and a second side plate 22 disposed on the lower side. It consists of and. High pressure substrates 23 a to 23 d are disposed on the first side plate 21. A power board 25a and a control board 25b are disposed on the second side plate 22, and a power outlet 27 is connected to the power board 25a.

  3 is a partially enlarged view of the vicinity of the power supply board 25a in FIG. 2, FIG. 4 is a view showing a state in which the power supply board 25a in FIG. 3 is removed and the line processing guide member 30 is exposed, and FIG. FIGS. 6 and 7 are perspective views of the line processing guide member 30 as viewed from the front surface side and the back surface side, respectively. Portions common to those in FIG. 2 are denoted by common reference numerals and description thereof is omitted. In FIG. 5, the wiring 31 is not shown.

  The line processing guide member 30 is a resin member fixed to the second side plate 22. On the surface side of the line processing guide member 30, a plurality (three in this case) of wiring guides 30 a for preventing the wiring 31 of the power supply board 25 a from lifting, two core mounting portions 30 b for mounting the ferrite core 33, and a power source A plurality of support portions 30c that support the back surface of the substrate 25a are formed. A locking claw 30 d for fixing to the second side plate 22 protrudes from the back surface side of the line processing guide member 30.

  Further, the line processing guide member 30 is provided with a substrate fixing bracket 35 in which a screw hole 35a for fixing the power supply substrate 25a with a screw is formed. The ferrite core 33 is cylindrical, and a through hole 33a for inserting the wiring 31 is formed.

  When attaching the power supply substrate 25a to the second side plate 22, first, the wiring 31 is inserted into the through hole 33a of the ferrite core 33, and the ferrite core 33 is fitted into the core mounting portion 30b while pushing the wiring 31 below the wiring guide 30a. Then, the locking claw 30d of the line processing guide member 30 is inserted and fixed to the second side plate 22, and finally the power supply board 25a is screwed to the line processing guide member 30 to thereby prevent electromagnetic wave noise when the power supply board 25a is attached. Countermeasures and wiring processing can be performed simultaneously and easily.

  With this configuration, the ferrite core 33 for countermeasure against electromagnetic wave noise also has a guide function for the wiring 31, so the number of members can be reduced and the cost can be reduced. Further, since the ferrite core 33 is fixed to the line processing guide member 30, it is not necessary to provide a fixing structure for the ferrite core 33 on the power supply substrate 25a side, the structure of the mold for molding the substrate is simplified, and the ferrite core 33 is The tolerance of the mounting position is also increased.

  Further, even if the wiring 31 is detached from the wiring guide 30a, the ferrite core 33 does not swing with the wiring 31, so that the power supply board 25a can be reliably prevented from being damaged by the collision of the ferrite core 33.

  Further, since the line processing guide member 30 also serves as a support member for supporting the power supply board 25a, the power supply board 25a can be supported at a distance from the second side plate 22 as shown in FIG. Increases effectiveness. Moreover, since it is not necessary to provide a support member separately, it contributes also to reduction of a number of members.

  FIG. 8 is a partial cross-sectional view showing another configuration example of the line processing guide member 30. As shown in FIG. 8, the ferrite core 33 fixed to the core mounting portion 30b of the line processing guide member 30 has a through hole 33a penetrating through the opening 22a formed in the second side plate 22 from the front surface side to the back surface side. Is arranged. In FIG. 8, the wiring 31 is not shown as in FIG.

  According to the configuration of FIG. 8, the ferrite core 33 serves as a bush for routing the wiring 31 from the front surface side to the back surface side of the second side plate 22 and fixing the wiring 31 to the opening 22a. Accordingly, it is possible to prevent a connector (not shown) of the wiring 31 from being disconnected or a load being applied to the power supply board 25a when the wiring 31 is pulled. Further, it is advantageous in terms of cost as compared with a configuration using a bush as a separate member.

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of this invention. For example, in the above-described embodiment, the case where the line processing guide member 30 is used for the wiring process of the power supply board 25a attached to the second side plate 22 and the electromagnetic wave noise countermeasure has been described, but it is attached to the control board 25b or the first side plate 21. It can be used in exactly the same way for the wiring processing of the high-voltage boards 23a to 23d and the electromagnetic wave noise countermeasure.

  Moreover, there is no restriction | limiting in particular also about the shape and number of the wire processing guide member 30 or the ferrite core 33, What is necessary is just to set suitably according to the number of a board | substrate and wiring.

  The wiring processing structure of the present invention is not limited to the tandem type color printer as shown in FIG. 1, but is also applicable to other types of image forming apparatuses such as monochrome and color copiers, digital multifunction peripherals, and monochrome printers. Of course, the present invention can also be applied to the wiring processing structure of electronic equipment other than the image forming apparatus.

  The present invention can be used for a wiring processing structure used in an electronic apparatus such as an image forming apparatus. By utilizing the present invention, it is possible to simultaneously achieve electromagnetic wave noise countermeasures and wiring processing with a simple configuration.

Pa to Pd Image forming unit 20 Frame side plate (frame plate)
21 1st side plate 22 2nd side plate 22a Opening 23a-23d High voltage board 25a Power supply board 25b Control board 30 Line processing guide member 30a Wiring guide 30b Core attachment part 30c Support part 30d Locking claw 31 Wiring 33 Ferrite core 33a Through hole 100 Color Printer (electronic equipment)

Claims (4)

A line processing guide member that is attached to the frame plate of the electronic device and positions the wiring connected to the electronic device body; and
A ferrite core fixed to the core mounting portion of the wire processing guide member and having a through-hole through which the wiring is inserted;
Wiring processing structure with   The wiring processing structure according to claim 1, wherein the ferrite core is disposed so that the through hole passes through an opening formed in the frame plate.   2. The line processing guide member positions a wiring connected to a substrate attached to the frame plate and an electronic device main body, and also serves as a support member that supports the substrate. 3. The wiring processing structure according to 2.   The electronic device provided with the wiring processing structure in any one of Claims 1 thru | or 3.

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