JP2014038353A - Image forming apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure an air channel for cooling in a device by effectively utilizing limited space in the device while maintaining insulation of a plurality of high voltage contacts.SOLUTION: An image forming apparatus relating to this invention includes an apparatus body 2, a body side plate 31 erected in the apparatus body 2, a plurality of process units 25 attached to the apparatus body 2, a high voltage substrate 26 for supplying high voltage to each process unit 25, a plurality of high voltage contact members 27 for connecting the high voltage substrate 26 and each process unit 25, and a contact holding member 28 for insulating the plurality of high voltage contact members 27. The contact holding member 28 includes a substrate holding member 39 for holding the high voltage substrate 26, and a high voltage terminal base 41 arranged at an inner side from the substrate holding member 39 through a body side plate 31. A recessed part 78 is recessedly provided in the high voltage terminal base 41, an air channel 61 is formed by the recessed part 78, and the plurality of high voltage contact members 27 are arranged while maintaining a space distance.

Description

  The present invention relates to an image forming apparatus such as a printer, a copier, a facsimile machine, or a multifunction machine equipped with these functionally, and in particular, includes a high voltage supply mechanism for supplying a high voltage to a process unit attached to the apparatus body. The present invention relates to an image forming apparatus.

  2. Description of the Related Art Conventionally, image forming apparatuses such as printers, copiers, facsimiles, and multifunction machines equipped with these functions have various process units (for example, an image carrier) in order to form a color image by superimposing a plurality of colors. Body unit, developing unit, primary transfer unit, secondary transfer unit, and cleaning unit), a high-voltage substrate that supplies a high voltage to these process units, and a plurality of high-voltage contact members that connect the high-voltage substrate to the process unit. Is arranged. The plurality of high-voltage contact members are generally arranged in a state of being fixed to a resin contact holding member in order to ensure insulation between the high-voltage contact members (for example, Patent Documents). 1).

  On the other hand, in the image forming apparatus described above, it is necessary to prevent the writing optical system from being distorted due to heat generated inside the apparatus, thereby causing color misregistration or deterioration of the developer. Therefore, an image forming apparatus in which an air passage for transferring cooling air into the apparatus is provided is known (for example, Patent Document 2).

JP 2009-115931 A JP2007-65178A

  Conventionally, a contact holding member (see Patent Document 1) for securing insulation of a high-voltage contact member and an air passage (see Patent Document 2) for transferring cooling air are separated into separate spaces. Was formed. However, in the image forming apparatus, downsizing of the apparatus is progressing, and it is required to further reduce the space occupied by each member in the apparatus.

  Therefore, in consideration of the above circumstances, the present invention is to effectively utilize a limited space in the apparatus and maintain an air passage for cooling in the apparatus while maintaining the insulation of the plurality of high-voltage contact members. Objective.

  An image forming apparatus according to the present invention includes an apparatus main body, a main body side plate standing in the apparatus main body, a plurality of process units attached to the apparatus main body, and a high-voltage substrate that supplies a high voltage to each process unit. A plurality of high-voltage contact members that electrically connect the high-voltage substrate and the process units; and a contact holding member that is attached to the main body side plate and insulates the plurality of high-voltage contact members from conductive parts. The contact holding member includes a substrate holding member that holds the high-voltage substrate, and a high-voltage terminal block that is disposed on the inner side of the substrate holding member via the main body side plate. A concave portion is provided along the direction, and an air passage through which cooling air for cooling the inside of the apparatus main body is circulated by the concave portion is formed between the main body side plate and the high-voltage terminal block, and Wherein the number of pressure contact member is positioned in said contact holding member maintains the spatial distance not leak to each other.

  The air passage may include an inflow portion that communicates with an intake port that is opened in an exterior cover of the apparatus main body, and the inflow portion may communicate with an intake fan disposed inside the intake port. .

  The image forming apparatus further includes a power supply substrate that supplies power to the high-voltage substrate, and a partition that partitions a space between the intake fan and the main body side plate, and the inflow flows into one space of the partition An introduction path for communicating the portion and the intake fan may be formed, and the other space of the partition wall may be communicated with the exhaust port of the exterior cover via the arrangement space of the power supply board.

  Further, the air passage includes a first air passage that communicates with the first air outlet that faces one of the polygon mirrors arranged inside the apparatus main body, and the inflow portion. The first passage is formed by a partition plate. A second air outlet that is partitioned and faces the other polygon mirror disposed inside the apparatus main body may be further provided with a second flow path that communicates the inflow portion.

  Furthermore, the plurality of high-voltage contact members include a first coil spring that constitutes a spring contact with the high-voltage substrate, a second coil spring that constitutes a spring contact with the process unit, the first coil spring, and the second coil spring. And a linear part that connects the two, and a connecting coil part may be formed at an intermediate part of the linear part.

  According to the image forming apparatus of the present invention, it is possible to effectively utilize a limited space in the apparatus and secure an air passage for cooling in the apparatus while maintaining insulation of the plurality of high-voltage contacts. .

1 is a perspective view illustrating an appearance of an image forming apparatus according to an embodiment of the present invention. 1 is an explanatory diagram of an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view from the back side of the apparatus main body, showing the main part of the image forming apparatus according to the embodiment of the present invention. It is a perspective view which shows the state which attached the high voltage | pressure board | substrate to the board | substrate holding member. It is explanatory drawing which shows a high voltage contact member. It is a perspective view which shows a board | substrate holding member. It is explanatory drawing which shows the attachment process to the board | substrate holding member of a high voltage | pressure board | substrate. It is a perspective view which shows a connection member. It is an expansion perspective view which shows the connection support part of a connection member. It is a perspective view from the apparatus main body left back which shows a high voltage | pressure terminal block. It is a perspective view from the apparatus main body right side rear which shows a high voltage | pressure terminal block. It is a top sectional view showing the flow of the cooling air inside the device body.

  An image forming apparatus according to an embodiment of the present invention will be described with reference to the drawings.

  First, the overall configuration of the image forming apparatus of the present invention will be described mainly with reference to FIGS. FIG. 1 is a perspective view showing an appearance of an image forming apparatus according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of the image forming apparatus according to an embodiment of the present invention.

  As shown in FIG. 1, a color printer 1 as an image forming apparatus according to an embodiment of the present invention includes a paper discharge tray 3 formed on the upper surface of the apparatus main body 2 and an outer cover that covers the outer peripheral surface of the apparatus main body 2. 4, a manual feed tray 5 provided in the center of the front of the apparatus main body 2 (front side in FIG. 1), a paper feed tray 6 provided at the lower front end of the apparatus main body 2, and an exterior cover on the rear side of the side of the apparatus main body 2 4 and an exhaust port 8 opened in the exterior cover 4 in front of the side surface of the apparatus body 2.

  As shown in FIG. 2, the color printer 1 includes a sheet feeding cassette 9 disposed in the sheet feeding tray 6 and a transfer sheet set in the sheet feeding cassette 9 or the manual feed tray 5 in the apparatus main body 2. A transport path 10 to be transported, a paper feed section 11 for supplying transfer paper set in the paper feed cassette 9 to the transport path 10, and a manual paper feed for supplying transfer paper set in the manual feed tray 5 to the transport path 10 Unit 74, a plurality of toner containers 12 storing replenishing toner, an intermediate transfer belt 13 disposed below the plurality of toner containers 12, and a plurality of photosensitive drums disposed below the intermediate transfer belt 13. 14, a charger (not shown) for charging the surface of the photosensitive drum 14 to a predetermined voltage, and a beam flux is emitted to the surface of the photosensitive drum 14 charged by the charger to generate a predetermined electrostatic latent A developing device 16 that develops the electrostatic latent image formed by the exposing device 15 into a toner image with toner, and the toner image is primarily applied to the intermediate transfer belt 13 in cooperation with the photosensitive drum 14. The primary transfer roller 17 to be transferred, the cleaning device 18 to remove the toner remaining on the surface of the photosensitive drum 14, the charge eliminating device 19 to remove the charge on the photosensitive drum 14, and the primary transfer roller 17. A secondary transfer unit 20 that secondary-transfers the toner image from the intermediate transfer belt 13 to the transfer sheet in the middle of the conveyance path 10 and a cleaning device 21 that removes toner remaining on the surface of the intermediate transfer belt 13 after the secondary transfer. And a fixing unit 22 for fixing the toner image secondarily transferred onto the transfer paper to the transfer paper on the downstream side of the conveyance path 10, and double-sided printing of the fixed transfer paper It includes a reversing path 23 for reversing conveyed to the upstream side of the conveying path 10, the order.

  The exposure unit 15 scans each beam flux emitted from a plurality of light sources corresponding to each photoconductor drum 14 with a pair of polygon mirrors 24 (a) and (b) while scanning the beam flux on the photoconductor drum 14. Form an image.

  In the above configuration, when the color printer 1 is turned on, various parameters are initialized, and initial settings such as setting the temperature of the fixing unit 22 are performed. When image data is input from a computer or the like connected to the color printer 1 and an instruction to start printing is given, an image forming operation is executed as follows.

  First, after the surface of the photosensitive drum 14 is charged by a charger (not shown), the exposure unit 15 exposes the photosensitive drum 14 according to the image data, and electrostatically applies to the photosensitive drum 14. A latent image is formed. Next, the developing unit 16 develops the electrostatic latent image into a toner image of a corresponding color with toner. This toner image is primarily transferred to the intermediate transfer belt 13 by applying a voltage (−) opposite to the polarity of the toner to the primary transfer roller 17. By sequentially repeating the above operation for each color, a full-color toner image is formed on the intermediate transfer belt 13. This full-color toner image is subjected to secondary transfer onto the transfer paper that has been conveyed to the secondary transfer unit 20 through the conveyance path 10 by applying a voltage having a polarity (−) opposite to that of the toner to the secondary transfer unit 20. Is done. The full-color toner image secondarily transferred onto the transfer paper is fixed to the transfer paper by the fixing unit 22, and the transfer paper on which the toner image is fixed is discharged to the paper discharge tray 3. Further, the toner remaining on the surface of the intermediate transfer belt 13 is removed by the cleaning device 21 after the completion of the secondary transfer in the secondary transfer unit 20.

  As described above, the apparatus main body 2 of the color printer 1 is provided with a number of process units for executing the image forming process. Among such process units, process units that require a high voltage (for example, the photosensitive drum 14, the charger, the developing device 16, the primary transfer roller 17, the cleaning device 18, the secondary transfer unit 20, and the cleaning device 21). The configuration for supplying a high voltage to the fixing unit 22 (hereinafter simply referred to as the process unit 25) will be described mainly with reference to FIGS.

  3 is a cross-sectional view of the main part of the image forming apparatus according to the embodiment of the present invention from the back side of the apparatus main body, FIG. 4 is a perspective view showing a state in which the high-voltage substrate is attached to the substrate holding member, and FIG. FIG. 6 is a perspective view showing the substrate holding member, FIGS. 7A to 7C are explanatory views showing the process of attaching the high voltage substrate to the substrate holding member, and FIG. FIG. 9 is an enlarged perspective view showing the connection support portion of the connection member, FIG. 10 is a perspective view showing the high-voltage terminal block from the left rear side of the apparatus body, and FIG. 11 is the high-voltage terminal block. FIG. 12 is an explanatory view showing a flow of cooling air inside the apparatus main body.

  As shown in FIG. 3, inside the apparatus main body 2 of the color printer 1, a high voltage substrate 26 for supplying a high voltage to the process unit 25 that requires a high voltage, and the high voltage substrate 26 and the process unit 25. A high-voltage contact member 27 for electrically connecting the high-voltage contact member 27 and a contact holding member 28 for holding the high-voltage contact member 27 are disposed.

  As shown in FIG. 3, the high-voltage board 26 is erected on the inner side of the exterior cover 4 of the apparatus main body 2 with its lower end held by the contact holding member 28 (the erection means will be described later). At the lower end of the high-voltage board 26, as shown in FIG. 4, a plurality of terminals 29 (four sets in this embodiment) 29 (one set in this embodiment) are arranged. Engagement holes 30 are formed in both corners. Further, the high-voltage board 26 is connected to a power supply board 38 (see FIG. 3) fixed to the main body side plate 31 erected in the apparatus main body 2 by wiring (not shown). The high-voltage board 26 includes a transformer (not shown) for converting the AC power supplied from the power board 38 into DC and high-voltage.

  As shown in FIG. 5, the high-voltage contact member 27 is formed by winding and bending a single conductive wire, and constitutes a first spring contact 32 that is a spring contact with the high-voltage board 26. A first coil spring 33; a second coil spring 35 that constitutes a second spring contact 34 that is a spring contact with the process unit 25; and a linear portion 36 that connects the first coil spring 33 and the second coil spring 35. A coiled connecting coil part 37 is formed in the middle part of the linear part 36. A plurality of high-voltage contact members 27 (three in this embodiment) are arranged as one set on the contact holding member 28 (four in this embodiment).

  As shown in FIG. 3, the contact holding member 28 includes a board holding member 39 that holds the high voltage board 26, a connecting member 40 that is connected and fixed to the board holding member 39, and a high voltage terminal block 41. The substrate holding member 39, the connecting member 40, and the high-voltage terminal block 41 are formed of a resin material in order to insulate the high-voltage contact member 27 held by these members from conductive parts (for example, a sheet metal frame).

  The substrate holding member 39 is attached to the main body side plate 31 by a snap fit mechanism and screws (not shown). As shown in FIG. 6, a protrusion 42 is formed on the lower portion of the substrate holding member 39 so as to protrude outward, and a plurality of (main) members are provided in the protrusion 42 along the longitudinal direction of the substrate holding member 39. In the embodiment, four storage portions 43 are formed. In each storage portion 43, one set (three in the present embodiment) of first coil springs 33 of each high-voltage contact member 27 is stored in a state of maintaining a spatial distance that does not leak with each other. In addition, a circular insertion hole 45 is formed at a position corresponding to each terminal 29 of the high-voltage board 26 on the distal end surface 44 of the protruding portion 42, and the first spring contact of each high-voltage contact member 27 is formed from the insertion hole 45. 32 protrudes outward. Engagement protrusions 46 are provided at positions corresponding to the engagement holes 30 of the high-pressure board 26 at both end portions of the protrusion 42. Further, a plurality (six in this embodiment) of extending pieces 47 for mounting the high-pressure substrate 26 are formed outwardly extending at the lower end of the front end surface 44 of the protrusion 42. . A plurality of (four in this embodiment) snap fittings 48 made of a resin material are arranged in the arrangement interval of the extending pieces 47, and the snap fitting 48 has a distal end side as shown in FIG. As shown in (c), a tapered tapered locking portion 49 is provided.

  An arc-shaped recess 50 is formed from one end to the other end in the longitudinal direction of the substrate holding member 39 on the upper surface of the inner surface of the substrate holding member 39 (the right-side surface in FIG. 3). An engaging portion 52 is provided.

  The connecting member 40 is attached to the inner surface side of the substrate holding member 39 by connecting means (not shown). At the upper part of the outer surface of the connecting member 40 (the left surface in FIG. 3), the upper part is bent in an L shape from one end to the other end in the longitudinal direction at a position corresponding to the arc-shaped recess 50 of the substrate holding member 39. A connecting recess 51 having an arcuate lower portion is formed, and the other engaging portion 53 is formed below the connecting recess 51 at a position corresponding to the one engaging portion 52 of the substrate holding member 39. Then, in a state in which the substrate holding member 39 and the connecting member 40 are connected, the one engaging portion 52 and the other engaging portion 53 are engaged, and the arc-shaped recess 50 and the connecting recess 51 are disposed above the engaging portion. An enclosed waste toner carrying case 54 is formed. A screw 55 as a residual toner conveyance mechanism is disposed in a longitudinal direction within the waste toner conveyance case 54 in a state of being connected to a drive source (not shown).

  At the lower part of the inner surface of the connecting member 40 (the right side surface in FIG. 3), as shown in FIG. 8, there is one connecting support portion 56 for supporting the connecting coil portion 37 of the high-voltage contact member 27. Two sets are provided as a set, and a plurality of sets (four in this embodiment) are provided. As shown in FIG. 9, the connection coil portion 37 of the high-voltage contact member 27 is supported in each connection support portion 56 in a state where a spatial distance that does not leak is maintained. The connection support part 56 includes a spring receiver 57 to which one end of the connection coil part 37 is engaged, a support frame 58 that supports the lower end of the connection coil part 37, a guide frame 59 that guides the upper part of the connection coil part 37, It has. A communication hole (not shown) is formed in the base end portion of the support frame 58, and the linear portion 36 of the high-voltage contact member 27 is connected from the storage portion 43 side of the substrate holding member 39 through the communication hole. The coil portion 37 is inserted into the connection support portion 56 side of the material.

  The high-voltage terminal block 41 is attached to the main body side plate 31 and is disposed on the inner side of the substrate holding member 39 and the connecting member 40 via the main body side plate 31 as shown in FIG. As shown in FIG. 3, a contact guide 75 for holding the second coil spring 35 of the high-voltage contact member 27 is provided on the upper portion of the high-voltage terminal block 41. As shown in FIG. 10, a plurality of contact guides 75 (three in this embodiment) are formed as one set, and a plurality of sets (four in this embodiment) are formed along the longitudinal direction of the high-voltage terminal block 41. . In each contact guide 75, the second coil springs 35 of the high-voltage contact member 27 are arranged so as to maintain a spatial distance that does not leak from each other, and the second spring contacts 34 formed at the tip of the second coil spring 35 are contact guides. It protrudes from the upper end of 75. As shown in FIG. 3, a communication hole 76 is formed in the lower portion of each contact guide 75, and the linear portion 36 of the high-voltage contact member 27 is connected to the connection support portion 56 of the connection member 40 through the communication hole 76. From the side, the high voltage terminal block 41 is inserted into the contact guide 75 side.

  As shown in FIG. 3, an air passage 61 is formed between the main body side plate 31 and the side wall 60 of the high-voltage terminal block 41 at the lower portion of the high-voltage terminal block 41. As shown in FIG. 11, the air passage 61 is formed by a recess 78 that is recessed along the longitudinal direction of the high-voltage terminal block 41, and an inflow portion 62 provided on one end side of the high-voltage terminal block 41; The inflow portion 62 is configured by a lower flow path 64 as a first flow path communicating with one end and an upper flow path 63 as a second flow path. The upper flow path 63 and the lower flow path 64 are partitioned up and down by a partition plate 66 extending obliquely upward from the bottom wall 65 of the high-voltage terminal block 41, and the other end of the lower flow path 64 is connected to the side wall 60. The other end of the upper flow path 63 communicates with the second air outlet 68 formed on the other side of the side wall 60. As shown in FIG. 12, the first air outlet 67 is disposed at a position facing one polygon mirror 24 (a) disposed in the exposure device 15, and the second air outlet 68 is formed in the exposure device 15. It is arranged at a position facing the other arranged polygon mirror 24 (b).

  Further, as shown in FIG. 12, the inflow portion 62 of the air passage 61 is formed through an introduction passage 69 formed between the exterior cover 4 and the main body side plate 31 and a communication opening 70 formed in the main body side plate 31. It communicates with the intake fan 71. The intake fan 71 is disposed inside the intake port 7 of the exterior cover 4 (right side portion) so as to be inclined with respect to the longitudinal direction of the exterior cover 4. The introduction path 69 is formed in a space above the partition wall 72 that vertically partitions the space between the intake fan 71 and the main body side plate 31, and the space below the partition wall 72 is an arrangement space 73 of the power supply substrate 38. Through the exhaust port 8 of the exterior cover 4.

  In the color printer 1 having such a configuration, in order to fix the high voltage substrate 26 to the substrate holding member 39, the engagement hole 30 of the high voltage substrate 26 and the substrate holding member 39 are engaged as shown in FIG. The positions of the mating protrusions 46 are aligned, and the high-pressure substrate 26 is pressed toward the substrate holding member 39 as shown in FIG. By this pressing, the lower end of the high-voltage board 26 gets over the locking piece 49 while elastically deforming the snap fit 48 made of a resin material downward, and the lower end portion of the high-pressure board 26 becomes the locking piece as shown in FIG. 49 is locked inside. As a result, as shown in FIG. 4, the high-voltage board 26 is erected on the upper surface of the extension piece 47 of the board holding member 39, and at the same time, as shown in FIG. 7C, the first spring contact 32 of the high-voltage contact member 27. However, the high-voltage board 26 and the high-voltage contact member 27 are electrically connected to each other by crimping to the terminal 29 of the high-voltage board 26.

  In this embodiment, since the substrate holding member 39 as the contact holding member 28 is also used as the holding member for the high voltage substrate 26 in this way, the member for holding the high voltage substrate 26 and the high voltage contact member 27 are separated from the holding member. Compared to the case of forming the device, the configuration of the apparatus can be simplified. Further, since the snap-fit attachment / detachment means using the elastic force of the resin material is used, the attachment / detachment of the high-voltage substrate 26 to the substrate holding member 39 is facilitated as compared to the case of using fixing means such as screwing. Can be done. Further, by fixing the high voltage substrate 26 to the substrate holding member 39, the first spring contact 32 of the high voltage contact member 27 is pressure-bonded to the terminal 29 of the high voltage substrate 26, and the high voltage substrate 26 and the high voltage contact member 27 are automatically connected. Therefore, it is not necessary to separately make an electrical connection between the high-voltage board 26 and the high-voltage contact member 27, and the work burden during installation can be reduced.

  Further, in the color printer 1 having the above-described configuration, in order to supply a high voltage to each process unit 25, the terminal 29 of the high voltage board 26 is connected to the first spring contact 32 of the first coil spring 33 as shown in FIG. Contact. Further, the connection terminal 77 formed at the lower end of the process unit 25 is brought into contact with the second spring contact 34 of the second coil spring 35. Then, an AC voltage is supplied from the power supply board 38 to the high voltage board 26 via a wiring (not shown), and this AC voltage is converted into a DC voltage and a high voltage by a transformer disposed on the high voltage board 26, and then is connected via the high voltage contact member 27. Supply to each process unit 25.

  At that time, in the image forming apparatus of the present invention, the first coil springs 33, the connecting coil portions 37, and the second coil springs 35 of the plurality of high-voltage contact members 27 are respectively the substrate holding member 39 and the connecting member 40 as the contact holding members 28. In addition, since the high voltage terminal block 41 is arranged with a spatial distance that does not leak from each other, there is no possibility that the high voltage contact members 27 may electrically interfere with each other. Further, since the substrate holding member 39, the connecting member 40, and the high-voltage terminal block 41 as the contact holding member 28 are all made of a resin material, a conductive component (for example, a sheet metal frame disposed in the apparatus main body). Insulation is also ensured. Therefore, it is possible to stably supply a high voltage from the high voltage substrate 26 to each process unit 25.

  Further, as shown in FIG. 5, since the high-voltage contact member 27 connects the first coil spring 33 and the second coil spring 35 via the linear portion 36, as long as there is a gap through which the linear portion 36 can pass, Wiring can be easily performed in a narrow space in the main body 2. Furthermore, since the connecting coil part 37 is formed in the intermediate part of this linear part 36, compared with the case where it connects between the 1st coil spring 33 and the 2nd coil spring 35 only by the linear linear part 36, It becomes possible to improve the stability of the shape of the high-voltage contact member 27. Further, when connecting the process unit 25, the high-voltage board 26 and the high-voltage contact member 27, it is possible to absorb the impact applied to the spring contacts 32, 34 by the connecting coil unit 37, and It is also possible to adjust the length of the linear portion 36 by changing the length.

  Further, in the color printer 1 having the above-described configuration, when the screw 55 in the waste toner transport case 54 is rotated by a drive source (not shown), the apparatus main body 2 is passed through the waste toner transport case 54. The waste toner inside is transferred to the outside. In this embodiment, since the contact holding member 28 is also used as the waste toner carrying case 54 as described above, it is not necessary to form the contact holding member 28 and the waste toner carrying case 54 separately. The space in 2 can be effectively used, and the configuration of the apparatus can be simplified.

  In the color printer 1 having the above-described configuration, in order to cool the inside of the apparatus main body 2 with cooling air, the intake fan 71 is rotated by an intake fan power source (not shown). As a result, as shown in FIG. 12, outside air is drawn into the apparatus main body 2 through the intake port 7 of the exterior cover 4, and the drawn outside air is used as cooling air in the direction of the partition wall 72 through the intake fan 71. Spray. Of the cooling air blown in the direction of the partition wall 72, the cooling air blown above the partition wall 72 enters the air passage 61 through the introduction passage 69 and the communication opening 70 of the main body side plate 31. And is divided into upper and lower portions by a partition plate 66 provided in the air passage 61. And the cooling air which flowed into the downward direction of the partition plate 66 is sprayed from the 1st ventilation port 67 to one polygon mirror 24 (a) via the downward flow path 64. FIG. The cooling air that has flowed into the upper part of the partition plate 66 is blown from the second air outlet 68 to the other polygon mirror 24 (b) via the upper flow path 63.

  In the present invention, the air passage 61 is formed in the high-voltage terminal block 41 which is the contact holding member 28 as described above, and the polygon mirrors 24 (a) (b) disposed inside the apparatus main body 2 through the air passage 61. ) To cool the polygon mirrors 24 (a) and 24 (b). Thus, by forming the air passage 61 in the contact holding member 28, it is not necessary to form the air passage 61 for cooling the members inside the apparatus main body 2 separately from the contact holding member 28. A limited space in the main body 2 can be used effectively.

  In addition, as described above, the air passage 61 includes the inflow portion 62 that communicates with the air inlet 7, and the inflow portion 62 that faces the one polygon mirror 24 (a) disposed inside the apparatus main body 2. The lower flow path 64 communicating with the blower port 67 and the lower flow path 64 are partitioned by a partition plate 66, and the inflow portion 62 is opposed to the other polygon mirror 24 (b) disposed inside the apparatus main body 2. And an upper flow path 63 that communicates with the second air outlet 68. Therefore, the cooling air can be efficiently blown from the accurate position to the polygon mirrors 24 (a) and (b) arranged to face the air blowing ports 67 and 68, respectively.

  Of the cooling air blown in the direction of the partition wall 72 via the intake fan 71, the cooling air blown below the partition wall 72 passes through the space below the partition wall 72 to the arrangement interval 73 of the power supply substrate 38. After flowing in and cooling the power supply substrate 38, it is discharged to the outside through the exhaust port 8. In the present embodiment, the partition wall 72 is disposed adjacent to the intake fan 71 as described above, and the polygon mirror 24 (a) disposed inside the main body side plate 31 with the cooling air blown above the partition wall 72. While cooling (b), the power supply board 38 arrange | positioned on the outer side of the main body side board 31 is cooled with the cooling air sprayed on the downward direction of the partition 72. Therefore, the inner member and the outer member of the main body side plate 31 can be simultaneously cooled by only one intake fan 71, and the intake fan 71 can be used efficiently.

1 Color printer (image forming device)
2 apparatus main body 4 exterior cover 7 intake port 8 exhaust port 24 (a) (b) polygon mirror 25 process unit 26 high voltage substrate 27 high voltage contact member 28 contact holding member 31 main body side plate 32 first spring contact 33 first coil spring 34 second Spring contact 35 Second coil spring 36 Linear portion 37 Coupling coil portion 38 Power supply board 39 Board holding member 41 High voltage terminal block 61 Air passage 62 Inflow part
63 Upper channel (first channel)
64 Lower channel (second channel)
66 divider
67 1st air vent
68 Second air vent
69 Introduction path 71 Intake fan 72 Bulkhead 73 Arrangement space 78 Concavity

Claims (5)

The device body;
A main body side plate standing in the apparatus main body;
A plurality of process units attached to the apparatus body;
A high voltage substrate for supplying a high voltage to each process unit;
A plurality of high-voltage contact members that electrically connect the high-voltage substrate and the process units;
A contact holding member attached to the main body side plate for insulating the plurality of high-voltage contact members from conductive parts;
The contact holding member is
A substrate holding member for holding the high-pressure substrate;
A high-voltage terminal block disposed on the inner side through the main body side plate than the substrate holding member,
The high-voltage terminal block is provided with a recess along the longitudinal direction, and the recess forms an air passage between the main body side plate and the high-voltage terminal block for circulating cooling air for cooling the inside of the apparatus main body. In addition, the image forming apparatus is characterized in that the plurality of high-voltage contact members are arranged on the contact holding member so as to maintain a spatial distance at which leakage does not occur.   The air passage includes an inflow portion that communicates with an intake port that is opened in an exterior cover of the apparatus main body, and the inflow portion is in communication with an intake fan disposed inside the intake port. The image forming apparatus according to claim 1. A power supply board for supplying power to the high-voltage board;
A partition that partitions the space between the intake fan and the main body side plate,
In one space of the partition wall, an introduction path for communicating the inflow portion and the intake fan is formed,
The image forming apparatus according to claim 2, wherein the other space of the partition wall communicates with an exhaust port of the exterior cover via a space in which the power supply substrate is disposed. The air path is
A first flow path for communicating the inflow portion with a first air blowing port facing one polygon mirror disposed inside the apparatus main body;
The first flow path is further partitioned by a partition plate, and further includes a second air flow opening facing the other polygon mirror disposed inside the apparatus main body and a second flow path communicating the inflow portion. The image forming apparatus according to claim 2, wherein the image forming apparatus is an image forming apparatus. The plurality of high-voltage contact members are
A first coil spring constituting a spring contact with the high-pressure substrate;
A second coil spring constituting a spring contact with the process unit;
A linear portion that connects the first coil spring and the second coil spring;
The image forming apparatus according to claim 1, wherein a connecting coil portion is formed at an intermediate portion of the linear portion.

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