JP2011249700A - Fitting structure of electric component board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting structure of an electric component board and an image forming apparatus including the same capable of minimizing an arrangement space of the electric component board as long as possible with easy exchange of the electric component board.SOLUTION: In a body frame 30 of an image forming apparatus 100, a cutout opening 30a is formed. An electric component board 31 is fixed with board fixing machine screws 45a to 45d to a board fitting plate 37 having a concavity 35, inserting the concavity 35 of the board fitting plate 37 in which the electric component board 31 is fixed to the cutout opening 30a, fixing the board fitting plate 37 to the body frame 30 with fitting plate fixation machine screws 43a to 43d. Thereby, the electric component board 31 is fitted to the body frame 30 via the board fitting plate 37, so that a surface of the electric component board 31 and a surface of the body frame 30a is on the substantially same plane.

Description

  The present invention relates to an electrical board mounting structure used in an electronic device or the like provided with an electronic component.

  2. Description of the Related Art Electronic devices such as copying machines, personal computers, and televisions are provided with an electrical board for applying a high voltage to a unit (component) inside the apparatus that requires a high voltage. This electrical board is placed at a position away from the unit in order to avoid adverse effects on the unit due to electromagnetic waves generated from the electrical board, and the voltage is applied by connecting the contact terminals of the unit and the electrical board with a cable with a connector. It is a configuration to be supplied.

  On the other hand, electromagnetic wave noise generated from electronic components on the electrical board may further leak to the outside and affect surrounding electrical products. As a countermeasure for preventing leakage of electromagnetic wave noise, for example, Patent Document 1 discloses a method of effectively shielding electromagnetic noise by housing an electrical board in a shield box that blocks electromagnetic wave noise. .

JP 2007-95967 A

  However, in the method of Patent Document 1, since the shield box to which the electrical board is attached is mounted so as to overlap the sheet metal surface of the main body frame, the shield box protrudes from the sheet metal surface and the outer size of the apparatus main body increases, This hinders downsizing and space saving.

  Here, it is also possible to avoid protrusion of the electrical board from the surface of the body frame by attaching the electrical board to the back surface (inner side surface) of the body frame. However, in this case, it is necessary to remove the main body frame in order to replace the electrical board, which makes it difficult to replace the electrical board.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an electrical board mounting structure and an image forming apparatus including the electrical board mounting structure in which the layout space of the electrical board can be made as small as possible and the electrical board can be easily replaced.

  In order to achieve the above object, the present invention provides an electrical board mounting structure for mounting an electrical board on which electronic components are arranged to a frame of an apparatus body, and the frame has an opening into which the electronic parts can be inserted. The electronic board is inserted into the frame, the electronic component is inserted into the opening, and the first surface of the electrical board opposite to the electronic component is the second side of the frame opposite to the electronic part. It is attached so that it may be arrange | positioned in the said electronic component side rather than the surface of this, and substantially flush or the said 2nd surface.

  Further, according to the present invention, in the mounting structure for an electrical board according to the above configuration, the frame is provided with a recess capable of accommodating the electronic component, and the opening is formed from the opening of the recess.

  Further, according to the present invention, in the mounting structure of the electrical board having the above-described structure, the electrical board is attached to the frame via an attachment member.

  Further, the present invention is the mounting structure of the electrical board according to the above configuration, wherein the electrical board is attached to the frame via an attachment member, the recess is formed in the attachment member, A notch hole into which the concave portion is inserted is formed.

  Further, according to the present invention, in the mounting structure of the electrical board having the above-described configuration, the electrical board is for applying a high voltage to the constituent members of the apparatus main body, and is provided between the bottom surface of the recess and the electrical board. An insulating member having a cylindrical portion penetrating through the hole formed in the bottom surface is disposed, and one end is pressed by the electrical board and the other end is electrically connected to the constituent member in the cylindrical portion. A metal spring member pressed against the contact is inserted and supported, and the electrical board and the component member are electrically connected via the spring member.

  Further, the present invention is an image forming apparatus provided with the mounting structure of the electrical board having the above-described configuration.

  According to the first configuration of the present invention, the frame has a configuration having an opening into which an electronic component can be inserted. The electronic component is inserted into the frame, the electronic component is inserted into the opening, and the electronic component of the electronic component is By mounting so that the first surface on the opposite side is substantially flush with the second surface on the opposite side of the frame or closer to the electronic component side than the second surface, the arrangement space of the electrical board is made as small as possible. In addition, the replacement of the electrical board can be facilitated.

  According to the second configuration of the present invention, in the electrical board mounting structure of the first configuration described above, the frame is provided with a recess capable of storing an electronic component, and the opening is formed from the opening of the recess. Therefore, it is possible to shield electromagnetic noise generated from the electronic component.

  According to the third configuration of the present invention, in the electrical board mounting structure according to the first or second configuration, the electrical board is attached to the frame via the mounting member, so that the electrical board is mounted on the electrical board. Since it is possible to make a subassembly into a mounting member together with the components interposed between the device and the constituent members of the apparatus main body, it is possible to efficiently replace the electrical board.

  According to the fourth configuration of the present invention, in the electrical board mounting structure of the second configuration, the electrical board is mounted to the frame via the mounting member, and the recess is formed in the mounting member. By forming a notch hole in the frame where the recess is inserted, not only shields the electromagnetic noise generated from the electronic components, but also facilitates subassembly, making the replacement of the electrical board more efficient It can be carried out.

  Further, according to the fifth configuration of the present invention, in the mounting structure of the electrical board of the fourth configuration, the electrical board is for applying a high voltage to the component of the apparatus body, and the bottom surface of the recess An insulating member having a cylindrical portion penetrating a hole formed in the bottom surface is disposed between the electrical component substrate and one end is pressed by the electrical component substrate and the other end is electrically connected to the component member. When inserting and supporting a metal spring member to be pressed against the contact, and electrically connecting the electrical board and the component member via the spring member, together with the electrical board when replacing the electrical board The insulating member and the spring member can be removed and attached at the same time.

  Thereby, since the complicated operation | work accompanying replacement | exchange of an electrical equipment board | substrate can be avoided, the exchange work of an electrical equipment board | substrate can be performed more efficiently. In addition, it is easy to electrically connect the electrical board and the constituent members.

  Further, according to the sixth configuration of the present invention, the image forming apparatus having the electrical substrate mounting structure having any one of the first to fifth configurations can be used to save the space of the apparatus main body. Can do.

1 is a schematic view of an image forming apparatus including an electrical board mounting structure according to a first embodiment of the present invention. The perspective view which shows the state which removed the side cover of the image forming apparatus. Enlarged view around the electrical board in Fig. 2 Longitudinal cross section around electrical circuit board (cross section AA 'in Fig. 3) FIG. 3 is a schematic plan view of the board mounting plate of FIG. FIG. 5 is a schematic plan view showing a state in which an insulating plate is arranged on the board mounting plate of FIG. Longitudinal sectional view around the cylindrical part (CC 'section in FIG. 5) Cross-sectional view showing electrical connection state around electrical board (BB 'cross section in FIG. 3) The longitudinal cross-sectional view which shows the attachment structure of the electrical equipment board which concerns on 2nd Embodiment of this invention The longitudinal cross-sectional view which shows the attachment structure of the electrical equipment board which concerns on 3rd Embodiment of this invention

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic view of an image forming apparatus having an electrical board mounting structure according to a first embodiment of the present invention. The image forming apparatus 100 is a tandem type color copying machine. In the image forming apparatus (apparatus main body) 100 main body, four image forming portions Pa, Pb, Pc, and Pd are sequentially arranged from the left side in FIG. Yes. These image forming portions Pa to Pd are provided corresponding to images of four different colors (yellow, magenta, cyan, and black), and yellow, magenta, and cyan are respectively obtained by charging, exposure, development, and transfer processes. And a black image are sequentially formed.

  The image forming portions Pa to Pd are provided with photosensitive drums 1a, 1b, 1c, and 1d that carry visible images (toner images) of the respective colors, and are further rotated in the counterclockwise direction in FIG. A transfer belt 8 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 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 transferred onto a sheet P as an example of a recording medium, and after being fixed on the sheet P in the fixing unit 7, it is 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 clockwise in FIG.

  The paper P on which the toner image is transferred is housed in a paper cassette 16 at the lower part of the apparatus, and is driven by a secondary transfer roller 9 and a driving roller for an intermediate transfer belt 8 described later via a paper feed roller 13a and a registration roller pair 13b. 11 to the nip between the two. A sheet made of a dielectric resin is used for the intermediate transfer belt 8, and a belt in which both ends thereof are overlapped and joined to form an endless shape, or a belt without a seam (seamless) is used. A cleaning blade 17 that removes toner remaining on the surface of the intermediate transfer belt 8 by applying a voltage is disposed downstream of the secondary transfer roller 9 in the moving direction of the intermediate transfer belt 8.

  The image reading unit 20 includes a scanner lamp that illuminates the document during copying, a scanning optical system equipped with a mirror that changes the optical path of reflected light from the document, and a condensing lens that focuses the reflected light from the document to form an image. , And a CCD sensor or the like (none of which is shown) that converts the imaged image light into an electrical signal, and reads a document image and converts it into image data.

  Next, the image forming units Pa to Pd will be described. There are charging devices 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, which are rotatably arranged. The exposure device 4 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 devices 5a, 5b, 5c and 5d are provided.

  When image data is input from the image reading unit 20, first, the surfaces of the photosensitive drums 1 a to 1 d are uniformly charged by the charging devices 2 a to 2 d, and then a light beam is irradiated according to the image data by the exposure device 4. Then, electrostatic latent images corresponding to the image data from the image reading unit 20 are formed on the photosensitive drums 1a to 1d. Each of the developing devices 3a to 3d includes a developing roller (developer carrying member) disposed so as to face the photosensitive drums 1a to 1d, and a predetermined amount of two-component developer containing toners of yellow, magenta, cyan, and black, respectively. Filled. The toner is supplied onto the photosensitive drums 1a to 1d by the developing rollers of the developing devices 3a to 3d, and electrostatically adheres to the electrostatic latent image formed by exposure from the exposure device 4. A toner image is formed.

  Then, the primary transfer rollers 6a, 6b, 6c and 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, so that yellow on the photosensitive drums 1a to 1d, Magenta, cyan, and black toner images are 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, the toner remaining on the surfaces of the photosensitive drums 1a to 1d is removed by the cleaning devices 5a to 5d in preparation for the subsequent formation of a new electrostatic latent image.

  The intermediate transfer belt 8 is stretched around a driven roller 10, a drive roller 11, and a tension roller 12. The intermediate transfer belt 8 rotates counterclockwise as the drive roller 11 is rotated by a belt drive motor (not shown). Is started, the sheet P is conveyed from the registration roller 13b to the nip portion (secondary transfer nip portion) between the secondary transfer roller 9 and the intermediate transfer belt 8 provided close to the intermediate transfer belt 8 at a predetermined timing. The full color image is secondarily transferred onto the paper P at the nip portion. The paper P on which the toner image is transferred is conveyed to the fixing unit 7.

  The sheet P conveyed to the fixing unit 7 is heated and pressurized when passing through the nip portion (fixing nip portion) of the fixing roller pair 14 to fix the toner image on the surface of the sheet P, and a predetermined full-color image is formed. It is formed. The sheet P on which the full-color image is formed is distributed in the conveyance direction by the conveyance guide member 21 arranged at the branching portion of the sheet conveyance path 19 through the conveyance roller pair 15 and is sent as it is (or sent to the double-side conveyance path 23). After double-sided copying, the paper is discharged to the discharge tray 18 via the discharge roller pair 25.

  Specifically, the sheet conveyance path 19 is bifurcated into the left and right forks on the downstream side of the conveyance roller pair 15, and one path (a path branched in the left direction in FIG. 1) communicates with the discharge tray 18. ing. The other path (the path branched in the right direction in FIG. 1) is configured to communicate with the double-sided conveyance path 23. Further, in order to increase the rigidity of the apparatus main body and support the weight of the image reading unit 20, a reinforcing sheet metal 27 as a reinforcing member is attached between the upper surface of the apparatus main body and the image reading unit 20.

  2 is a perspective view showing a state in which the side cover of the image forming apparatus is removed, FIG. 3 is an enlarged view around the electrical board in FIG. 2, and FIG. 4 is a longitudinal sectional view around the electrical board (AA ′ in FIG. 3). 5 is a schematic plan view of the substrate mounting plate of FIG. 3, FIG. 6 is a schematic plan view showing a state where an insulating plate is disposed on the substrate mounting plate of FIG. 5, and FIG. FIG. 8 is a cross-sectional view (CC ′ cross-section in FIG. 5), and FIG. 8 is a horizontal cross-sectional view (BB ′ cross-section in FIG. 3) showing an electrical connection state around the electrical board. In FIG. 4, the insulating plate 51 and the conical spring 53 are omitted, and the electronic component 33 is omitted in FIG.

  As shown in FIGS. 2 to 4, a sheet metal body frame (frame) 30 exists inside the side cover, and an electrical board 31 for generating a high voltage is attached to the body frame 30. Electronic components 33 such as a transistor, a transformer for converting AC voltage into DC voltage, and a choke coil are disposed on the back surface (inner side surface of the device main body) of the electrical board 31, and the surface (outer surface of the device main body) is a solder surface It has become.

  Further, the main body frame 30 is provided with a recess 35 for attaching the electrical component board 31. Here, the concave portion 35 is formed in a substrate attachment plate (attachment member) 37 described later. The recess 35 is recessed toward the inside of the apparatus main body (see the left side of FIG. 4), and an opening 36 is formed by the opening. The size of the opening 36 is substantially the same as that of the electrical board 31, and the depth of the recess 35 is formed deeper than the maximum height of the electronic component 33 disposed on the electrical board 31.

  The electrical board 31 is attached to the main body frame 30 via the board attachment plate 37 so that the electronic component 33 is accommodated in the recess 35. Also, as shown in FIG. 4, the surface of the electrical board 31 (first surface, right side in the figure) and the surface of the main body frame 30 (second surface, right side in the figure) are substantially flush. Yes. Note that the surface of the electrical board 31 can also be arranged on the back side (the electrical component 33 side, the left side in the figure) of the main body frame 30.

  As shown in FIG. 4, the substrate mounting plate 37 is formed in a metal box shape, and has a recess 35 that is recessed inward from the main body frame 30, and the recess 35 is formed in the main body frame 30. It is inserted into the cutout hole 30a. As shown in FIGS. 3 to 5, flange portions 38 a to 38 d that overlap with the peripheral edge of the cutout hole 30 a protrude from the sides of the opening 36 in the recess 35 along the main body frame 30. Such concave portions 35 and flange portions 38a to 38d can be formed by drawing or molding.

  Among these, as shown in FIG. 5, through holes 39 a to 39 d through which the screw portions of the mounting plate fixing screws 43 a to 43 d (see FIG. 3) pass are formed in the flange portions 38 a to 38 c. Further, screw holes (not shown) into which the mounting plate fixing screws 43 a to 43 d are screwed are formed at positions facing the through holes 39 a to 39 d of the main body frame 30. Then, the board attachment plate 37 is attached to the main body frame 30 by fixing the flange portions 38 a to 38 c to the main body frame 30 using the attachment plate fixing screws 43 a to 43 d.

  Screw holes 40a to 40d into which the screw portions of the substrate fixing screws 45a to 45d (see FIG. 3) are screwed are formed on the bottom surface 35a of the recess 35 of the substrate mounting plate 37. In addition, through holes (not shown) through which the screw portions of the board fixing screws 45a to 45d pass are formed at positions facing the screw holes 40a to 40d of the electrical board 31. Then, the electrical board 31 is attached to the board mounting plate 37 by fixing the electrical board 31 to the bottom surface 35 a using the board fixing screws 45 a to 45 d.

  In addition, a plurality of (here, five) hole portions 41 are formed in the bottom surface 35a along the horizontal direction of FIG. As shown in FIG. 6, an insulating plate (insulating member) 51 made of, for example, a resin material is disposed on the bottom surface 35a. In the position facing the hole 41 of the insulating plate 51, the back side (see the back side of FIG. 6, see the left side of FIG. 7) and the front side (see the front side of FIG. 6, the right side of FIG. 7). ) Protrudes from the cylindrical portion 51a. When the insulating plate 51 is disposed on the bottom surface 35a, the cylindrical portion 51a is inserted into the hole 41 (see FIG. 7).

  As shown in FIG. 7, the diameter of the inner peripheral surface 51aa of the cylindrical portion 51a is larger on the front side (right side in FIG. 7) than on the back side (left side in FIG. 7). A metal conical spring (spring member) 53 is inserted into the cylindrical portion 51a from the front surface side, and when the conical spring 53 is inserted into the cylindrical portion 51a, due to the difference in diameter of the inner peripheral surface 51aa, the back surface side is moved. Movement is restricted.

  Thereby, the conical spring 53 is supported by the cylindrical part 51 in a state of protruding from the cylindrical part 51 to the front surface side and the back surface side. As shown in FIG. 8, when the electrical board 31 is fixed to the board mounting plate 37, the front side (right side in FIG. 8) end of the conical spring 53 is placed on the back side (left side in FIG. 8) by the electrical board 31. While being pressed, it is electrically connected to a contact portion (not shown) of the electrical board 31. Further, the electrical board 31, the insulating plate 51, and the conical spring 53 are sub-assembled on the board mounting plate 37.

  Further, a clip 59 is disposed on the back surface of the main body frame 30. The clip 59 extends from a power source 65 (see FIG. 2), and supplies a voltage supplied from the power source 65 to the electrical component board 31. The cable 60 is clamped. A first connector 60 a is provided at the tip of the cable 60, and the first connector 60 a passes through a through hole (not shown) formed in the recess 35 and is electrically connected to the second connector 57 arranged on the electrical board 31. As a result, a voltage is supplied from the power supply 65 to the electrical board 31.

  In addition, the primary transfer rollers 6a to 6d and the cleaning blade 17 (constituent members, which are opposed to the conical spring 53 on the side opposite to the electrical substrate 31 (left side in FIG. 8) across the concave portion 35 of the substrate mounting plate 37 are disposed. Contact points 55a to 55e electrically connected to (see FIG. 1) are arranged. The contacts 55a to 55e are provided on the contact holding base 55.

  When the board mounting plate 37 to which the electrical board 31 is fixed is fixed to the main body frame 30, the back end of the conical spring 53 is pressed against the contacts 55a to 55e and electrically connected to the contacts 55a to 55e. Connected. As a result, the electrical board 31 and the contacts 55a to 55e are electrically connected via the conical spring 53, and a high voltage can be supplied from the electrical board 31 to the primary transfer rollers 6a to 6d and the cleaning blade 17. .

  Next, attachment and removal of the electrical board 31 to the main body frame 30 will be described. When attaching the electrical board 31 to the main body frame 30, first, as shown in FIG. 8, the insulating plate 51 is disposed on the bottom surface 35a of the recess 35 of the board mounting plate 37, and the cylindrical portion is formed in the hole 41 (see FIG. 5). 51a is inserted, and the conical spring 53 is inserted into the cylindrical part 51a from the surface side.

  After that, the electrical board 31 is placed in the opening 36 of the recess 35 while pressing the front side end of the conical spring 53 to the back side, and the board fixing screws 45a to 45d are fastened to attach the electrical board 31 to the board. Fix to the mounting plate 37. As a result, the conical spring 53 and the electrical board 31 are electrically connected.

  Then, the first connector 60 a is connected to the second connector 57, and the concave portion 35 of the board mounting plate 37 to which the electrical board 31 is attached and the back side end of the conical spring 53 protrudes, thereby the back side end of the conical spring 53. The board mounting plate 37 is fixed to the main body frame 30 by inserting the parts into the cutout holes 30 a of the main body frame 30 while pressing the parts against the contacts 55 a to 55 e and fastening the mounting plate fixing screws 43 a to 43 d.

  Thereby, the conical spring 53 and the contacts 55a to 55e are electrically connected, and the electrical board 31 and the contacts 55a to 55e are electrically connected via the conical spring 53 as a whole. Further, the electrical board 31 is attached to the main body frame 30 via the board attachment plate 37.

  On the other hand, when removing the electrical board 31 from the main body frame 30, contrary to the above, first, the mounting board fixing screws 43 a to 43 d are loosened, and the electrical board 31, the insulating plate 51 and the conical spring 53 are removed together with the board mounting plate 37. The first connector 60a is removed from the second connector 57. Then, the board fixing screws 45a to 45d are loosened, the electrical board 31 is removed from the board mounting plate 37, the electronic component 33 on the electrical board 31 is replaced, and then the electrical board 31 is again attached to the main body frame 30 as described above. It is attached via a substrate attachment plate 37.

  If necessary, the electrical board 31 can be removed from the board mounting plate 37 and the conical spring 53 and the insulating plate 51 can be removed. Also, only the electrical board 31 can be removed from the main body frame 30 by loosening the board fixing screws 45 a to 45 d without removing the board attachment plate 37 from the main body frame 30.

  As described above, the main body frame 30 includes the opening 36 into which the electronic component 33 can be inserted, and the electrical board 31 is inserted into the main body frame 30 and the electronic component 33 is inserted into the opening 36 and the surface of the electrical board 31 is inserted. Is attached so that the front surface of the main body frame 30 is substantially flush with the front surface of the main body frame 30 or on the back surface side of the main body frame 30. can do.

  As a result, the outer size of the main body of the image forming apparatus 100 is also reduced, which can contribute to downsizing and downsizing of the apparatus. Moreover, since it is not necessary to remove the main body frame 30 in order to replace the electrical board 31, the replacement work of the electrical board 31 can be facilitated.

  In the present embodiment, the main body frame 30 is provided with the recess 35 that can store the electronic component 33, and the opening 36 is formed from the opening of the recess 35, so that electromagnetic noise generated from the electronic component 33 can be shielded. it can.

  In this embodiment, since the electrical board 31 is attached to the main body frame 30 via the board mounting plate 37, the electrical board 31 is placed between the electrical board 31 and the primary transfer rollers 6 a to 6 d and the cleaning blade 17. Together with the intervening insulating plate 51 and conical spring 53, it can be attached to the substrate attaching plate 37 in advance before being attached to the main body frame 30 to form a subassembly. Thereby, the replacement | exchange operation | work of the electrical equipment board | substrate 31 can be performed efficiently.

  Further, in the present embodiment, the electrical board 31 is attached to the main body frame 30 via the board attachment plate 37, the concave portion 35 is formed in the substrate attachment plate 37, and the concave portion 35 is inserted into the main body frame 30. Since the cutout hole 30a is formed, the electromagnetic wave noise generated from the electronic component 33 can be shielded by the recess 35 as described above. In addition, since the insulating plate 51 and the conical spring 53 can be disposed in the concave portion 35, subassembly becomes easier, and the replacement work of the electrical board 31 can be performed more efficiently.

  In the present embodiment, the electrical board 31 is used to apply a high voltage to the primary transfer rollers 6 a to 6 d and the cleaning blade 17, and the bottom surface 35 a is disposed between the bottom surface 35 a of the recess 35 and the electrical board 31. An insulating plate 51 having a cylindrical portion 51a penetrating the formed hole portion 41 is disposed, and the front surface side end portion is pressed by the electrical board 31 and the back surface side end portion against the contacts 55a to 55d. The conical spring 53 to be pressed is inserted and supported, and the electrical substrate 31 is electrically connected to the primary transfer rollers 6 a to 6 d and the cleaning blade 17 through the conical spring 53.

  As a result, when the electrical board 31 is replaced, the insulating plate 51 and the conical spring 53 can be removed from and attached to the main body frame 30 together with the electrical board 31. Therefore, since it is possible to avoid troublesome work associated with the replacement of the electrical board 31 for applying a high voltage, the replacement work of the electrical board 31 can be performed more efficiently.

  In addition, it becomes easy to electrically connect the electrical substrate 31 to the primary transfer rollers 6a to 6d and the cleaning blade 17. In particular, in the present embodiment, since a high voltage is applied to the plurality of primary transfer rollers 6 a to 6 d provided in the color image forming apparatus 100 using the conical spring 53, the complication associated with the replacement of the electrical board 31. Is further avoided, and electrical connection is further facilitated.

  The electrical board 31 includes not only the primary transfer rollers 6a to 6d and the cleaning blade 17, but also the photosensitive drums 1a to 1d, the charging devices 2a to 2d, and the developing devices 3a to 3d, etc. It can also be for applying a high voltage to other components. However, the electrical board 31 is not particularly limited for such high voltage application.

  In addition, the shape and the like of the main body frame 30 and the board mounting plate 37 are not particularly limited to the present embodiment, and can be appropriately set according to the apparatus configuration and the like. In addition, the electrical board 31 can be directly attached to the main body frame 30 without using the board attachment plate 37.

  FIG. 9 is a longitudinal sectional view showing the mounting structure of the electrical board according to the second embodiment of the present invention. Portions common to FIG. 4 of the first embodiment are denoted by the same reference numerals and description thereof is omitted. In this embodiment, instead of forming the recesses 35 in the substrate mounting plate 37 as in the first embodiment, the recesses 35 are formed from the shape in which the main body frame 30 is recessed, and the electrical board 31 replaces the substrate mounting plate 37. It is directly attached to the main body frame 30 without intervention. Further, as in the first embodiment, the surface of the main body frame 30 and the surface of the electrical board 31 are substantially flush.

  Also in the present embodiment, since the electronic component 33 on the electrical board 31 is accommodated in the opening 36 and the recess 35, the electrical board 31 does not protrude from the surface of the main body frame 30, and the distance between the main body frame 30 and the side cover. Can be reduced, and the replacement work of the electrical board 31 can be facilitated. In addition, for example, the electrical board 31 can be attached to the recess 35 of the main body frame 30 of the present embodiment via a board mounting plate 37 similar to that of the third embodiment described later.

  In the present embodiment, when the electrical board 31 is used to apply a high voltage to the primary transfer rollers 6 a to 6 d and the cleaning blade 17, the first embodiment is applied to the bottom surface 35 a of the recess 35 of the main body frame 30. In the same manner as in the first embodiment, an insulating plate 51 is arranged so that the cylindrical portion 51a is inserted into the hole portion 41 (see FIG. 5). The conical spring 53 is inserted, and the back side end of the conical spring 53 is brought into contact with the contacts 55a to 55d (see FIG. 8).

  And after connecting the 1st connector 60a of the cable 60 to the 2nd connector 57 of the electrical equipment substrate 31, the electrical equipment substrate 31 is arrange | positioned in the opening part 36, pressing the front surface side edge part of the conical spring 53 by this on the back surface side. Then, the substrate fixing screws 45a to 45d may be directly attached to the main body frame 30. As a result, the front end of the conical spring 53 is pressed by the electrical board 31, the back end is pressed against the contacts 55 a to 55 e, and the electrical board 31 and the contacts 55 a to 55 e are connected via the conical spring 53. Electrically connected.

  FIG. 10 is a longitudinal sectional view showing the mounting structure of the electrical board according to the third embodiment of the present invention. Portions common to FIG. 4 of the first embodiment are denoted by the same reference numerals and description thereof is omitted. In the present embodiment, a cutout hole 30a is formed in the main body frame 30 as in the first embodiment, but the substrate mounting plate 37 is formed in a frame shape instead of being formed in a box shape. An opening 36 is formed by the opening of the substrate mounting plate 37.

  Further, projecting pieces 47a to 47d (only 47b and 47c are shown in FIG. 10) into which board fixing screws 45a to 45d (see FIG. 3) are screwed inwardly from the periphery of the opening 36 of the board mounting plate 37. Projected. The electrical board 31 is attached to the main body frame 30 via the board attachment plate 37. Further, as in the first embodiment, the surface of the main body frame 30 and the surface of the electrical board 31 are substantially flush.

  Also in the present embodiment, since the electronic component 33 on the electrical board 31 is accommodated in the opening 36, the electrical board 31 does not protrude from the surface of the main body frame 30, and the interval between the main body frame 30 and the side cover is reduced. In both cases, the replacement work of the electrical board 31 can be facilitated. Moreover, this embodiment is effective when the electromagnetic wave noise of the electrical equipment substrate 31 is small. In addition, without using the board mounting plate 37, a protruding piece similar to the protruding pieces 47a to 47d described above is projected from the periphery of the cutout hole 30a of the main body frame 30 to the inside of the opening, and the protruding piece is electrically mounted. The substrate 31 can also be directly attached.

  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, the number and arrangement position of the electronic components 33 on the electrical board 31 are not limited at all, and can be appropriately designed according to the configuration of the electrical board 31. In addition, the size of the insulating plate 51 can be appropriately set according to the insulation state between the electrical board 31 and the board mounting plate 37.

  In addition, the configuration of the conical spring 53 and the cylindrical portion 51a shown in the above embodiment is merely an example of a spring member and a cylindrical portion used in the mounting structure of the electrical board according to the present invention. As long as it is possible to support the spring member inserted into the cylindrical portion by the cylindrical portion, other configurations can be used as the spring member and the cylindrical portion.

  Further, considering the ease of replacement work of the electrical board 31, it is preferable that the spring member and the cylindrical portion can support the spring member by restricting the movement of the spring member to the back surface side by the cylindrical portion. In addition, these spring members and cylindrical portions are not essential components of the present invention, and may be used according to the use of the electrical board 31.

  In the above embodiment, the electrical board mounting structure of the present invention is applied to a color multifunction peripheral. However, color and monochrome image forming apparatuses such as copying machines, facsimiles, scanners, and laser printers, televisions, personal computers, etc. By applying to the electronic equipment, it contributes to downsizing and compactness of the apparatus, and also improves the detachability of the electrical board. In particular, the present invention is effective when applied to an electronic apparatus such as an image forming apparatus, a personal computer, or a television provided with an electrical substrate for applying a high voltage to a component inside the apparatus that requires a high voltage.

  According to the present invention, the frame has an opening into which an electronic component can be inserted, the electrical board is inserted into the frame, the electronic component is inserted into the opening, and the first surface of the electrical board opposite to the electronic component is the frame. This is a mounting structure of an electrical board that is mounted so as to be disposed on the electronic component side with respect to the second surface on the opposite side or substantially flush with the second surface.

  As a result, it is possible to reduce the arrangement space of the electrical board as much as possible and facilitate the replacement work of the electrical board. Further, by using the image forming apparatus having the above-described electrical substrate mounting structure, space saving of the apparatus main body can be achieved.

6a to 6d Primary transfer roller (component)
17 Cleaning blade (component)
30 Body frame
30a Cutout hole 31 Electrical board 33 Electronic component 35 Recess 35a Bottom face 36 Opening 37 Board mounting plate (mounting member)
43a to 43d Mounting plate fixing screw 45a to 45d Substrate fixing screw 51 Insulating plate (insulating member)
51a Cylindrical part 51aa Inner peripheral surface 53 Conical spring (spring member)
55a to 55e Contact 100 Image forming apparatus (apparatus body)

Claims (6)

An electrical board mounting structure for mounting an electrical board on which electronic components are arranged to the frame of the apparatus body,
The frame has an opening into which the electronic component can be inserted,
The electrical substrate is inserted into the frame, the electronic component is inserted into the opening, and the first surface of the electrical substrate opposite to the electronic component is substantially the second surface opposite to the frame. A mounting structure for an electrical board, wherein the mounting structure is mounted so as to be disposed on the electronic component side with respect to the plane or the second plane. The mounting structure for an electrical board according to claim 1, wherein the frame is provided with a recess capable of accommodating the electronic component, and the opening is formed from the opening of the recess. The mounting structure for an electrical board according to claim 1, wherein the electrical board is attached to the frame via an attachment member. The electrical board is attached to the frame via an attachment member,
The recess is formed in the attachment member;
The mounting structure for an electrical board according to claim 2, wherein the frame is formed with a cutout hole into which the recess is inserted. The electrical board is for applying a high voltage to the constituent members of the apparatus body,
An insulating member having a cylindrical portion penetrating a hole formed in the bottom surface is disposed between the bottom surface of the recess and the electrical component substrate.
A metal spring member is inserted into and supported by the cylindrical portion, one end of which is pressed by the electrical circuit board and the other end of which is pressed against a contact point electrically connected to the component member.
The mounting structure for an electrical board according to claim 4, wherein the electrical board and the component member are electrically connected via the spring member. An image forming apparatus comprising the mounting structure for an electrical board according to claim 1.

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