JP6337572B2 - Image forming apparatus - Google Patents

Description

  The present invention relates to an image forming apparatus.

  In a conventional image forming apparatus, an image forming unit having a charger and a voltage input unit that inputs a voltage to the charger is attached to a frame provided inside the apparatus main body. A substrate on which a voltage output unit including a transformer and the like is mounted is provided at a position facing the image forming unit across the frame, and a grounding member for grounding the substrate and the like is provided on the frame. The voltage output unit supplies a voltage to the charger via an output electrode extending from the voltage output unit to the voltage input unit of the image forming unit.

  In the conventional image forming apparatus, the voltage output unit on the substrate is disposed near the ground member due to space limitations inside the apparatus. Therefore, when an electronic component such as a transistor provided on the substrate fails, there is a possibility that the output voltage from the voltage output unit suddenly increases and discharge from the voltage output unit and the output electrode to the ground member. It was.

  Incidentally, there is a case for insulation as disclosed in Japanese Utility Model Laid-Open No. 5-94182. Even if this case is applied to a conventional image forming apparatus and the output electrode is inserted into a notch provided in the case to cover the voltage output unit, the output electrode is not covered by the case, so the output electrode is connected to the ground member. There is a risk of discharging.

Japanese Utility Model Publication No. 5-94182

  SUMMARY An advantage of some aspects of the invention is that it provides an image forming apparatus that can suppress discharge from a voltage output unit and an output electrode to a ground member.

  In order to achieve the above object, an image forming apparatus according to the present invention includes an output electrode, a photoconductor, a charger that charges the photoconductor, and a voltage input unit that inputs a voltage to the charger. A frame having a first penetrating portion into which the output unit is inserted, a substrate provided at a position facing the image forming unit across the frame, and provided on the substrate, A voltage output unit that outputs a voltage to the voltage input unit via the output electrode, a ground member that is provided in the vicinity of the voltage output unit and the output electrode, and is electrically grounded, and is non-conductive, A case that has a second penetration part through which the output electrode penetrates, and that covers the voltage output part so as to insulate the outside of the second penetration part from the ground member; and the first penetration From the second part to the second penetration part Between said ground member and the output electrode to insulate, characterized in that it comprises a covering portion having a non-conductive covering the outer periphery of the output electrode.

  According to the configuration of the present invention, the voltage output portion and the ground member are insulated by covering the voltage output portion with the case having non-conductivity, and further, the first penetration portion is separated from the first penetration portion by the non-conductive covering portion. By covering the outer periphery of the output electrode over the second penetration portion, the output electrode and the ground member are insulated, so that discharge from the output electrode and the voltage output portion to the ground member can be suppressed.

  In the image forming apparatus, the frame includes a first covering portion, the case includes a second covering portion, and the covering portion includes the first covering portion and the second covering portion. The first covering portion and the second covering portion are non-conductive, and the output electrode and the grounding member extend from the first penetration portion to the second penetration portion. The structure which coat | covers the outer periphery of the said output electrode so that between may be insulated.

  In the image forming apparatus, the first covering portion covers an outer periphery of the output electrode from the first penetration portion to the second penetration portion, and the second covering portion is the second penetration portion. Covering the outer periphery of the output electrode from the portion to the first penetration portion, and covering the outer periphery of the output electrode along the inner surface of the first covering portion, and the first covering portion and the second covering portion The structure which has a location which mutually overlaps with a coating | coated part may be sufficient.

  In the image forming apparatus, the voltage output unit is a molded transformer molded with an insulating resin, and the output electrode is connected to the molded transformer, and the voltage from the molded transformer is The structure currently extended toward the input part may be sufficient.

  In the image forming apparatus, the image forming unit includes a plurality of the photoreceptor, the charger, and the voltage input unit, and a plurality of the voltage output units are provided, and each of the voltage input units includes the plurality of the plurality of voltage input units. A voltage necessary for the charger is output, and the grounding member is provided in the vicinity of at least one voltage output unit and the output electrode among the plurality of voltage output units, and the case is in the vicinity of the grounding member. The structure which covers the provided voltage output part may be sufficient.

  In the image forming apparatus, at least one of the plurality of voltage output units is provided in the vicinity of one side on the substrate, and the other voltage output unit is provided on the other side other than the one side on the substrate. The case may be configured to cover a voltage output unit provided in the vicinity of one side of the substrate that is in the vicinity of the grounding member.

  In the image forming apparatus, the image forming unit has four each of the photoconductor and the charger, and the voltage input unit includes a first voltage input unit and a second voltage input unit, The first voltage input unit inputs voltages to the three chargers, the second voltage input unit inputs voltages to the other chargers, and the voltage output unit includes a first voltage output unit and The first voltage output unit is provided in the vicinity of one side of the substrate and outputs a voltage necessary for the three chargers to the first voltage input unit. The second voltage output unit is provided on the other side other than the one side on the substrate, and outputs a voltage necessary for the other charger to the second voltage input unit. The first voltage output unit may be covered.

  According to the configuration of the present invention, the discharge from the output electrode and the voltage output unit to the ground member can be suppressed.

1 is a schematic cross-sectional view illustrating a configuration of an image forming apparatus according to an embodiment of the present invention. 1 is a schematic block diagram of a high voltage power supply board provided in an image forming apparatus according to an embodiment of the present invention. FIG. 2 is a top view illustrating a configuration around the high-voltage power supply substrate when the inside of the image forming apparatus according to the embodiment of the present invention is viewed from above. FIG. 2 is a plan view showing an arrangement of a mold type transformer, a grounding member, and an insulating case when the inside of the image forming apparatus according to the embodiment of the present invention is viewed from the A direction. It is a perspective view showing the composition of the frame concerning one embodiment of the present invention. It is a BB sectional view showing arrangement of a mold type transformer, a coil spring electrode, a connection electrode, a grounding member, and an insulating case concerning one embodiment of the present invention. It is a perspective view which shows the structure of the insulation case which concerns on one Embodiment of this invention. It is sectional drawing which shows the structure of the insulation case which concerns on one Embodiment of this invention.

  Embodiments for carrying out the present invention will be described in detail with reference to the drawings.

1. Overall Configuration of Printer FIG. 1 is a schematic sectional view showing an internal configuration of a color printer 1 (an example of an “image forming apparatus”). In the following description, when distinguishing each component for each color, subscripts of Y (yellow), M (magenta), C (cyan), and K (black) are added to the reference numerals of the respective parts and are not distinguished. In this case, the subscript is omitted. The direction will be described with reference to the user when using the color printer 1. Specifically, in FIG. 1, the right side toward the paper surface is “front”, the left side is “back”, and the upward direction and the downward direction are “up” and “down”, respectively. Also, the back side of the page is “left” and the near side is “right”. The image forming apparatus is not limited to a color printer, and may be, for example, a multifunction machine having a FAX and a copy function, or a monochrome printer.

  A color printer (hereinafter simply referred to as “printer”) 1 includes a sheet feeding unit 3, a fixing device 4, an image forming unit 5, a high-voltage power supply substrate 200 (an example of a chain line: “substrate”), and a belt cleaning unit. 20, belt unit 30 is included. For example, the printer 1 converts a toner image composed of toner of one or a plurality of colors (four colors of yellow, magenta, cyan, and black in this embodiment) according to image data input from the outside into a sheet 15 (paper, OHP sheet). Etc.).

  The sheet feeding unit 3 is provided at the lowermost part of the printer 1 and includes a tray 17 for storing sheets 15 and a pickup roller 19. The sheets 15 accommodated in the tray 17 are picked up one by one by the pickup roller 19, and the sheets 15 are sent to the belt unit 30 via the conveyance roller 11 and the registration roller 12. The belt unit 30 includes a driving roller 31, a driven roller 32, four transfer rollers 33, and a belt 34.

  The image forming unit 5 includes an image forming unit 40. The image forming unit 40 includes four process units 40K, 40Y, 40M, and 40C. Each process unit 40K, 40Y, 40M, and 40C includes a charger 41K, 41Y, 41M, and 41C, and a photosensitive drum (an example of a “photosensitive member”) 42K, 42Y, 42M, and 42C.

  Each process unit 40K, 40Y, 40M, and 40C includes an exposure device 43, a drum cleaner roller 44, a unit case 46, a developing roller 47, and a supply roller 48, respectively. Further, the process unit 40K includes a paper dust removing roller 45.

  On the sheet 15 sent to the belt unit 30, a color image is formed by superimposing the toner images of the respective colors by the image forming unit 5 which is a well-known electrophotographic system. The sheet 15 on which the toner image is transferred is conveyed to the fixing device 4. Then, the toner image is fixed on the sheet 15 by heating and pressing in the fixing device 4. Thereby, formation of an image on the sheet 15 is achieved.

2. Next, FIG. 2 will be described. FIG. 2 is a schematic block diagram of the main substrate 10, the high-voltage power supply substrate 200, and the image forming unit 40.

  The high voltage power supply substrate 200 is provided with charging voltage generation circuits 51 and 52. The charging voltage generation circuits 51 and 52 are connected to the ASIC 8 via signal lines. The charging voltage generation circuit 51 is provided with a mold type transformer 90 (an example of a “first voltage output unit”). The charging voltage generation circuit 52 is provided with a molded transformer 100 (an example of a “second voltage output unit”). Molded transformers 90 and 100 include a transformer and a smoothing circuit.

  On the main substrate 10, an ASIC 8 having a CPU 60, a ROM 61, and a RAM 62 are mounted. The CPU 60 controls the charging voltage generation circuit. The ROM 61 stores an operation program and the like for the entire printer, and the RAM 62 is used for storing image data used for printing processing and developing the program in the ROM 61.

  The image forming unit 40 is provided with an input electrode 95 (an example of a “first voltage input unit”) and an input electrode 105 (an example of a “second voltage input unit”). The input electrode 95 is electrically connected to the chargers 41Y, 41M, and 41C included in the three process units 40Y, 40M, and 40C. The input electrode 105 is electrically connected to a charger 41K included in the process unit 40K.

  The charging voltage generation circuit 51 generates charging voltages to be applied to the discharge wires 11Y, 11M, and 11C of the three chargers 41Y, 41M, and 41C, respectively. The charging voltage generated by the charging voltage generation circuit 51 is output to the input electrode 95 via the connection electrode 94 by the mold type transformer 90 based on the control by the ASIC 8, and the chargers 41Y, 41M and 41C are charged. .

  After the charging voltage input to the input electrode 95 is divided, the divided charging voltage is applied to the three discharge wires 11Y, 11M, and 11C. The grid voltages of the grids 12Y, 12M, and 12C corresponding to the respective discharge wires are controlled so that the surfaces of the photosensitive drums 42Y, 42M, and 42C corresponding to the respective grids are uniformly charged with substantially the same potential (for example, + 700V). Is done.

  The charging voltage generation circuit 52 generates a charging voltage to be applied to the discharge wire 11K of the charger 41K. The charging voltage generated by the charging voltage generation circuit 52 is output to the input electrode 105 via the connection electrode 104 by the mold type transformer 100 based on the control by the ASIC 8, and the charger 41K is charged. Here, the charging voltage is, for example, 5.5 kV to 8 kV (positive polarity), and the grid voltage is, for example, about 700 V (positive polarity).

  The charging voltage generation circuit 51 generates a charging voltage according to the PWM signal from the PWM1 port of the ASIC 8, and the charging voltage is feedback controlled via the A / D1 port, A / D2 port, and A / D3 port. The charging voltage generation circuit 52 generates a charging voltage in accordance with the PWM signal from the PWM2 port of the ASIC 8, and the charging voltage is feedback-controlled through the A / D4 port.

3. Arrangement of Mold Type Transformer, Output Electrode and Ground Member Next, the arrangement of the mold type transformer, the output electrode and the ground member according to the present invention will be described with reference to FIGS.

  FIG. 3 shows a configuration inside the apparatus when the inside of the printer 1 is viewed from above. A right side frame 7 is disposed on the right side of the printer 1 and a left side frame 8 is disposed on the left side. As shown in FIG. 3, four process units 40K, 40C, 40M, and 40Y are detachably attached to the right side frame 7 and the left side frame 8. These four process units are respectively arranged between the right side frame 7 and the left side frame 8 in the order of 40K, 40C, 40M, and 40Y from the front side. A grounding member 111 and a high-voltage power supply substrate 200 which will be described later are provided on the opposite side of the right side frame 7 to the side on which the image forming unit 40 is mounted and facing the image forming unit 40. .

  The ground member 111 is provided on the right side frame 7 so as to extend in the front-rear direction. The high-voltage power supply substrate 200 is attached to the right side frame 7 by the attachment pillar 110 and the attachment member 120.

  Molded transformers 90 and 100 are installed on the high-voltage power supply substrate 200. The mold type transformer 90 is provided with a connection electrode 94 described later. Similarly, the connection electrode 104 is installed in the mold type transformer 100.

  The input electrode 95 and the input electrode 105 included in the image forming unit 40 are formed to extend rightward from the image forming unit 40 toward the right side frame 7. Then, the input electrode 95 and the connection electrode 94 are connected, and the input electrode 105 and the connection electrode 104 are connected. A charging voltage is inputted from the molded transformer 90 to the input electrode 95 through the connection electrode 94. In addition, a charging voltage is input from the molded transformer 100 to the input electrode 105 through the connection electrode 104. The mold type transformer 90 is covered with an insulating case 300 described later provided on the high voltage power supply substrate 200.

  A main substrate 10 on which the ASIC 8 is mounted is provided on the opposite side of the left side frame 8 to the side on which the image forming unit 40 is mounted. The main board 10 and the high voltage power supply board 200 are connected via a signal line (not shown).

  The positional relationship between the grounding member 111 and the mold type transformers 90 and 100 in the high-voltage power supply substrate 200 will be described with reference to FIG. FIG. 4 shows the high-voltage power supply substrate 200 and the right side frame 7 when viewed from the A direction (see FIG. 3). A chain line indicates a position where the mold type transformers 90 and 100 are provided on the high voltage power supply substrate 200. An alternate long and short dash line indicates the position of the insulating case 300 that covers the molded transformer 90.

  The high-voltage power supply substrate 200 is formed in a substantially rectangular shape extending in the front-rear direction. In the high-voltage power supply substrate 200, mold-type transformers 90 and 100 are provided in the vicinity of two corners located on the diagonal of the high-voltage power supply substrate 200. A grounding member 111 is provided behind the high-voltage power supply substrate 200 in the A direction, and a right side frame 7 is further provided behind the grounding member 111 in the A direction. The molded transformer 90 is disposed in the vicinity of one side that is the upper end of the high-voltage power supply substrate 200 and in the vicinity of the ground member 111. The molded transformer 100 is disposed in the vicinity of the other side, which is the lower end of the high-voltage power supply substrate 200, and at a position away from the ground member 111.

  Thus, the mold type transformers 90 and 100 are provided in the vicinity of the two corners located on the diagonal of the high-voltage power supply substrate 200. The distance between the mold type transformers 90 and 100 is as large as possible. This is to make it difficult for the discharge generated between the mold type transformers 90 and 100 to occur.

  On the other hand, the ground member 111 is made of metal and is electrically grounded. For example, the ground member 111 is connected to the high-voltage power supply substrate 200. When connecting the grounding member 111 and the high-voltage power supply substrate 200, it is better to provide the grounding member 111 and the high-voltage power supply substrate 200 at positions close to each other from the viewpoint of miniaturization of the apparatus. Therefore, if the mold type transformers 90 and 100 are provided in the vicinity of the two corners of the high-voltage power supply substrate 200 as described above, either of the mold type transformers 90 and 100 is close to the ground member 111. become. In the case of this embodiment, the mold type transformer 90 is close to the ground member 111.

  The mold type transformer 90 adjacent to the ground member 111 is covered with the insulating case 300, thereby suppressing the discharge generated between the ground member 111 and the mold type transformer 90. In the case of this embodiment, the molded transformer 100 is not close to the ground member 111. Therefore, the mold type transformer 100 is not covered with the insulating case 300.

  FIG. 5 is a perspective view showing the configuration of the right side frame 7. As shown in FIG. 5, the right side frame 7 has a base frame 7A formed in a substantially rectangular parallelepiped shape extending in the front-rear direction. A first through hole 7B (an example of a “first penetration part”) is provided in the upper rear portion of the base frame 7A, and a first through hole 7E is provided in the lower front portion of the base frame 7A. The first through holes 7B and 7E are round openings that pass through the base frame 7A and open on the side of the base frame 7A where the image forming unit 40 is mounted. First covering portions 7C and 7F are provided so as to extend from the edges of the first through holes 7B and 7E to the side opposite to the side on which the image forming unit 40 is mounted in a cylindrical shape. The first covering portions 7C and 7F are made of resin and have non-conductivity. The base frame 7A has a first hollow portion 7D. The first hollow portion 7D is a space constituted by the inner side surface of the first covering portion 7C. The base frame 7A has a first hollow portion 7G. The first hollow portion 7G is a space formed by the inner side surface of the first covering portion 7F.

  FIG. 6 is a cross-sectional view taken along the line BB showing the configuration of the insulating case 300 (an example of “case”) covering the molded transformer 90 and the right side frame 7. As shown in FIG. 6, the molded transformer 90 provided on the high-voltage power supply substrate 200 has a recess 92. The recess 92 is provided with a conduction portion 91 for outputting a charging voltage. The mold type transformer 90 is molded with an insulating resin except for electrode portions such as the conductive portion 91. A coil spring electrode 93 is inserted into the first through-hole 7B, and the coil spring electrode 93 is moved leftward from the conductive portion 91 toward the first through-hole 7B in a state where one end is in contact with the conductive portion 91. It is provided to extend. A connection electrode 94 is provided at the left end of the coil spring electrode 93 (the coil spring electrode 93 and the connection electrode 94 are examples of “output electrodes”). The connection electrode 94 is fitted in the first through hole 7B and the first hollow portion 7D so as to press the coil spring electrode 93 inserted through the first through hole 7B against the recess 92. Then, the input electrode 95 and the connection electrode 94 are connected, and the charging voltage output from the mold type transformer 90 is supplied from the conduction portion 91 to the input electrode 95 via the coil spring electrode 93 and the connection electrode 94.

  The ground member 111 is disposed near the upper part of the coil spring electrode 93 and the connection electrode 94. Here, the first covering portion 7C covers the outer periphery of the connection electrode 94 fitted in the first through hole 7B from the first through hole 7B to the central portion in the left-right direction of the first hollow portion 7D. doing. Further, the first covering portion 7C covers the outer periphery of the coil spring electrode 93 disposed in the first hollow portion 7D from the central portion in the left-right direction of the first hollow portion 7D to the right end portion of the first hollow portion 7D. doing. The first covering portion 7C protrudes to the right side of the ground member 111.

  Molded transformer 90 provided on high voltage power supply substrate 200 is covered with insulating case 300. The configuration of the insulating case 300 will be described in detail with reference to FIG. The insulating case 300 includes a main body portion 300A, a second through hole 300B (an example of a “second penetration portion”), and a second covering portion 300C. The insulating case 300 is integrally formed of resin and has non-conductivity. As shown in FIG. 7, the main body 300A is formed in a substantially rectangular parallelepiped shape. The second covering portion 300C is formed in a cylindrical shape extending from the main body portion 300A.

FIG. 8 shows a cross-sectional view of the insulating case 300 in FIG. As shown in FIG. 8, the main body 300A is formed in a rectangular cross section. An opening that opens in a rectangular shape is provided on one surface of the main body 300A. A second through hole 300B that penetrates the main body 300A in a round shape is provided on the surface of the main body 300A opposite to the opening. The second covering portion 300C is formed to extend in a cylindrical shape from the edge of the second through hole 300B. The insulating case 300 has a second hollow portion 300D. The second hollow portion 300D is
It is a space configured by the inner side surface of the second covering portion 300C.

  As shown in FIG. 6, the insulating case 300 is provided in a state where the opening provided in the main body 300 </ b> A is closed by the high-voltage power supply substrate 200. The insulating case 300 is provided on the high-voltage power supply substrate 200 so as to face the right side frame 7, and the second covering portion 300C is disposed at a position facing the first covering portion 7C. The main body 300 </ b> A covers the molded transformer 90 and insulates the ground member 111 from the molded transformer 90. The coil spring electrode 93 is inserted into the second through hole 300B through the second hollow portion 300D. The second covering portion 300C covers the outer periphery of the coil spring electrode 93 from the second through hole 300B to the left end of the second hollow portion 300D. Here, the outer side surface of the second covering portion 300C is inserted into the first hollow portion 7D provided in the right side frame 7, and the inner side surface and the second covering portion of the first covering portion 7C. An overlapping region 301 is provided in which the outer side surface of 300C overlaps with the BB cross section. In this way, the first covering portion 7C and the second covering portion 300C are interposed in the space between the ground member 111 and the coil spring electrode 93. In the present embodiment, the overlapping region 301 is arranged on the main body part 300A side from the virtual line 400 that bisects the distance between the base frame 7A and the surface of the main body part 300A facing the base frame 7A. ing.

  With such a configuration, the molded transformer 90 is covered with the main body 300A of the insulating case 300 having non-conductivity, so that the grounding member 111 and the molded transformer 90 can be insulated. Discharge from the mold type transformer 90 to the ground member 111 can be suppressed. Furthermore, since the mold type transformer 90 is molded with an insulating resin except for electrode portions such as the conducting portion 91, discharge from the mold type transformer 90 to the ground member 111 can be further suppressed. . Further, the outer circumferences of the coil spring electrode 93 and the connection electrode 94 are covered by the first covering portion 7C and the second covering portion 300C having non-conductivity from the first through hole 7B to the second through hole 300B. ing. As a result, the coil spring electrode 93 and the connection electrode 94 can be insulated from the ground member 111 provided in the vicinity of the coil spring electrode 93 and the connection electrode 94, so that the coil spring electrode 93 and the connection electrode 94 are connected to the ground member 111. Discharge can be suppressed.

  In the present embodiment, the outer side surface of the second covering portion 300C is inserted into the first hollow portion 7D, and the inner side surface of the first covering portion 7C and the outer side surface of the second covering portion 300C are , An overlapping region 301 that overlaps each other in the BB cross section is provided. By the way, in the case where the outer side surface of the second covering portion 300C is not inserted into the first hollow portion 7D, the right end of the first covering portion 7C and the left end of the second covering portion 300C are in contact with each other. Since is formed of resin, considering the dimensional accuracy during resin molding, there is a high possibility that a gap will be generated between the contact surfaces of the two. Therefore, there is a possibility of discharging from the coil spring electrode 93 to the ground member 111 through this gap. Therefore, in this embodiment, the outer side surface of the second covering portion 300C is inserted into the first hollow portion 7D, and the first covering portion 7C and the second covering portion 300C are mutually cross-sectioned along the BB cross section. An overlapping region 301 that overlaps is provided. As a result, the creepage distance from the coil spring electrode 93 to the ground member 111 is increased as compared with the configuration in which the first covering portion 7C and the second covering portion 300C do not have an overlapping region in the BB cross section. Yes. Therefore, since the insulation distance between the coil spring electrode 93 and the ground member 111 can be extended, the discharge from the coil spring electrode 93 to the ground member 111 can be further suppressed.

  In the embodiment, the outer side surface of the second covering portion 300C is inserted into the first hollow portion 7D, and the inner side surface of the first covering portion 7C and the outer side surface of the second covering portion 300C are: Although they overlap each other in the BB cross section, the present invention is not limited to this, and a configuration is provided in which a gap is provided between the outer side surface of the second covering portion 300C and the inner side surface of the first covering portion 7C. It may be.

  In the embodiment, the outer side surface of the second covering portion 300C is inserted into the first hollow portion 7D, but the present invention is not limited to this, and the outer side surface of the first covering portion 7C is The structure inserted in 2nd hollow part 300D may be sufficient.

  In the embodiment, the high-voltage power supply substrate 200 is provided on the right side frame 7 and the main substrate 10 is provided on the left side frame 8. However, the present invention is not limited to this, and the main substrate 10 is provided on the right side frame 7. The high voltage power supply substrate 200 may be provided on the left side frame 8.

  In the embodiment, the grounding member 111 is electrically connected to the high-voltage power supply board 200, but the present invention is not limited to this, and the grounding member 111 is electrically connected to components other than the high-voltage power supply board 200. It may be a configuration.

DESCRIPTION OF SYMBOLS 1 ... Printer, 7 ... Right side frame, 7B ... 1st through-hole, 7C ... 1st coating | coated part, 7D ... 1st hollow part, 111 ... Grounding member, 40 ... Image forming unit, 90, 100 ... Mold Type transformer, 93 ... Coil spring electrode, 200 ... High voltage power supply board, 300 ... Insulating case, 300A ... Main body part, 300B ... Second through hole, 300C ... Second covering part, 300D ... Second hollow part, 301 ... overlapping area

Claims (5)

An output electrode;
An image forming unit having a photoconductor, a charger for charging the photoconductor, and a voltage input unit for inputting a voltage to the charger, and a frame having a first penetration portion through which the output electrode penetrates. When,
A substrate provided at a position facing the image forming unit across the frame;
A voltage output unit provided on the substrate and outputting a voltage to the voltage input unit via the output electrode;
In the vicinity of the voltage output unit and the output electrode, a ground member provided on the frame, formed of metal, and electrically grounded;
A non-conductive case having a second penetration part through which the output electrode penetrates, and covering the voltage output part so as to insulate the outside of the second penetration part from the grounding member When,
A non-conductive covering portion covering an outer periphery of the output electrode so as to insulate between the output electrode and the ground member from the first penetration portion to the second penetration portion. ,
The frame includes a first covering portion that covers an outer periphery of the output electrode from the first penetration portion to the second penetration portion,
The case covers the outer periphery of the output electrode from the second penetration part to the first penetration part, and covers the outer circumference of the output electrode along the inner surface of the first coating part. Having a covering,
The covering portion is constituted by the first covering portion and the second covering portion,
The first covering portion and the second covering portion have portions that overlap each other,
The first covering portion and the second covering portion are non-conductive and insulate between the output electrode and the ground member from the first penetration portion to the second penetration portion. to way, images forming device you characterized by coating the outer periphery of the output electrode. The voltage output unit is a mold type transformer molded with an insulating resin,
The image forming apparatus according to claim 1, wherein the output electrode is connected to the mold type transformer and extends from the mold type transformer toward the voltage input unit. The image forming unit includes a plurality of the photoreceptor, the charger, and the voltage input unit,
A plurality of the voltage output units are provided, and each of the voltage input units outputs a voltage necessary for the plurality of chargers,
The ground member is provided in the vicinity of at least one voltage output unit and the output electrode among the plurality of voltage output units,
The image forming apparatus according to claim 1, wherein the case covers a voltage output unit provided in the vicinity of the ground member. At least one of the plurality of voltage output units is provided near one side of the substrate,
The other voltage output unit is provided on the other side other than the one side on the substrate,
The image forming apparatus according to claim 3, wherein the case covers a voltage output unit provided in the vicinity of one side on the substrate that is in the vicinity of the grounding member. The image forming unit has four each of the photoconductor and the charger, and the voltage input unit includes a first voltage input unit and a second voltage input unit,
The first voltage input unit inputs a voltage to the three chargers, the second voltage input unit inputs a voltage to the other chargers,
The voltage output unit includes a first voltage output unit and a second voltage output unit,
The first voltage output unit is provided in the vicinity of one side on the substrate, and outputs a voltage necessary for the three chargers to the first voltage input unit,
The second voltage output unit is provided on the other side other than the one side on the substrate, and outputs a voltage necessary for the other charger to the second voltage input unit,
The image forming apparatus according to claim 3, wherein the case covers the first voltage output unit.

Images