JP2013250326A - Image formation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an image formation device such that electric discharge is hard to occur between electrodes or power feeding members even if the image formation device is downsized.SOLUTION: An image formation device 1 includes: a main body 2; a process cartridge 17 detachably attached to the main body 2; an electric power supply 130 attached to the main body 2; a plurality of electrodes 120 provided to the process cartridge 17; a plurality of power feeding members 121 that are provided corresponding to the plurality of electrodes 120 and connect the electrodes 120 and the electric power supply 130; and an electric discharge prevention member 127 provided between two adjacent electrodes 120 or two adjacent feeding members 121.

Description

  The present invention relates to an image forming apparatus.

  For example, a process cartridge including a charger, a transfer roller, and the like is detachably mounted on an image forming apparatus such as a laser printer. The process cartridge is provided with a plurality of electrodes connected to the charger and the transfer roller. On the other hand, on the apparatus main body side of the image forming apparatus, the base end side is connected to a high-voltage power supply circuit provided on the apparatus main body side, and the front end side is electrically connected to each of the electrodes with the process cartridge mounted. There are provided a plurality of power supply members in contact with each other (see Patent Document 1).

Japanese Patent No. 3116820

  Image forming apparatuses tend to be increasingly smaller. When the image forming apparatus is downsized, the arrangement interval between the electrodes provided in the process cartridge and the arrangement interval between the plurality of power supply members are narrowed, and discharge between the electrodes or discharge between the power supply members is reduced. May occur.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an image forming apparatus in which the above-described discharge hardly occurs even when the image forming apparatus is downsized.

The first image forming apparatus of the present invention includes:
A main body, a process cartridge detachably attached to the main body, a power supply device provided in the main body, a plurality of electrodes provided in the process cartridge, and a plurality of electrodes provided corresponding to each of the plurality of electrodes. A plurality of power supply members that connect the electrodes and the power supply device, and a discharge suppression member provided between the two adjacent electrodes or between the two adjacent power supply members. Features.

  According to the first image forming apparatus of the present invention, the discharge suppression member can suppress discharge between two adjacent electrodes or between two adjacent power supply members. In addition, since the distance between two adjacent electrodes or the distance between two adjacent power supply members can be reduced, the main body or the process cartridge can be reduced in size.

  In the first image forming apparatus of the present invention, the discharge suppression member can be, for example, a metal member that is electrically insulated from the surroundings. In this case, discharge between the two adjacent electrodes or between the two adjacent power feeding members can be suppressed by the metal member. In addition, since the distance between two adjacent electrodes or the distance between two adjacent power supply members can be reduced, the main body or the process cartridge can be reduced in size.

  In the first image forming apparatus of the present invention, for example, the two adjacent electrodes or the two adjacent power supply members are in contact with the surface of a continuous member, and the discharge suppression member is a member of the continuous member. It can be set as the insulating porous member provided between the two said adjacent electrodes among the surfaces, or between the two said adjacent electric power feeding members.

  In this case, the insulating porous member can suppress discharge between two adjacent electrodes or between two adjacent power feeding members. In addition, since the distance between two adjacent electrodes or the distance between two adjacent power supply members can be reduced, the main body or the process cartridge can be reduced in size.

  In the first image forming apparatus of the present invention, the discharge suppression member has, for example, a mutual distance less than a predetermined value, between two adjacent electrodes, or a mutual distance less than a predetermined value. It can be provided between two adjacent power supply members. In this case, since the place where the discharge suppressing member is provided can be limited, the cost is reduced. The predetermined value is used to ensure electrical insulation between the two adjacent electrodes or power supply members in a state where the discharge suppression member is not provided between the two adjacent electrodes or power supply members. The minimum distance required.

The second image forming apparatus of the present invention is
A main body, a process cartridge detachably attached to the main body, a power supply device provided in the main body, a plurality of electrodes provided in the process cartridge, and a plurality of electrodes provided corresponding to each of the plurality of electrodes. A plurality of power supply members that connect the electrode and the power supply device, one of the two adjacent electrodes or the power supply member is a metal plate, and the other is a metal wire, The end facing the other is hemmed and bent.

  According to the second image forming apparatus of the present invention, the discharge between the two adjacent electrodes or between the two adjacent power feeding members is suppressed by the metal plate and the metal wire whose end portions are hemmed and bent. can do. In addition, since the distance between two adjacent electrodes or the distance between two adjacent power supply members can be reduced, the main body or the process cartridge can be reduced in size.

  In the second image forming apparatus of the present invention, the metal plate and the metal wire can be provided, for example, in a portion where the distance between the two adjacent electrodes or the power feeding member is less than a predetermined value. In this case, since the place which provides a metal plate and a metal wire can be limited, it becomes a cost reduction. Note that the predetermined value is a value between two adjacent electrodes or power supply members in a state where the two adjacent electrodes or power supply members are not configured by a metal wire and a metal plate whose end is hemmed. This is the minimum distance necessary to ensure electrical insulation.

The third image forming apparatus of the present invention is
A main body, a process cartridge that is detachably attached to the main body, and a high-pressure board that is provided on the main body and supplies power to the process cartridge, the high-pressure board adjacent to the plurality of high-pressure patterns. And a metal member which is provided between the two high-voltage patterns and is electrically insulated from the surroundings.

  According to the third image forming apparatus of the present invention, the discharge between two adjacent high voltage patterns can be suppressed by the metal member. Moreover, since the distance between two adjacent high voltage patterns can be reduced, the high voltage substrate and the main body can be reduced in size.

  In the third image forming apparatus of the present invention, the metal member can be provided, for example, between two adjacent high voltage patterns whose mutual distance is less than a predetermined value. In this case, since the place which provides a metal member can be limited, it becomes a cost reduction. The predetermined value is the minimum necessary to ensure electrical insulation between the two adjacent high voltage patterns in a state where the metal member is not provided between the two adjacent high voltage patterns. Distance.

2 is a side sectional view showing an internal configuration of the laser printer 1. FIG. FIG. 4 is a plan sectional view showing an assembled state of the process cartridge 17 with respect to the main body frame 2. FIG. 6 is a side view illustrating the configuration of a guide plate 95. 3 is a perspective view illustrating a contact state between an electrode 120 of a process cartridge 17 and a power supply member 121. FIG. (A) is explanatory drawing showing the structure of the electric power feeding member 121 in a part of guide plate 95, (b) is sectional drawing in the II cross section in (a). (A) is a top view showing the structure of the high voltage power supply circuit board 130, (b) is sectional drawing in the II-II cross section in (a). (A) is explanatory drawing showing the structure of the electric power feeding member 121 in a part of guide plate 95, (b) is sectional drawing in the III-III cross section in (a). (A) is explanatory drawing showing the structure of the electric power feeding member 121 in a part of guide plate 95, (b) is sectional drawing in the IV-IV cross section in (a).

Embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
1. Overall Configuration of Laser Printer 1 The overall configuration of a laser printer 1 as an example of an image forming apparatus will be described with reference to FIGS. As shown in FIG. 1, the laser printer 1 includes a main body frame 2, a feeder unit 4, and an image forming unit 5.

  The main body frame 2 includes a feeder unit 4, an image forming unit 5, and a pair of guide plates 95 (see FIG. 2). The main body frame 2 includes a front cover 93 that can be opened and closed. The feeder unit 4 feeds the sheet 3 to the image forming unit 5. The image forming unit 5 includes a scanner unit 16, a process cartridge 17, and a fixing unit 18.

  The process cartridge 17 is detachable from the main body frame 2. When the process cartridge 17 is attached to the main body frame 2, the process cartridge 17 is positioned below the scanner unit 16 (see FIG. 1), and a pair of guides provided in the main body frame 2. Located between the plates 95 (see FIG. 2). The process cartridge 17 can be attached and detached while the front cover 93 of the main body frame 2 is opened. The process cartridge 17 includes a drum cartridge 26 that is detachably attached to the main body frame 2 and a developing cartridge 28 that is accommodated in the drum cartridge 26.

  The drum cartridge 26 includes a cartridge frame 51, a photosensitive drum 27 provided in the cartridge frame 51, a scorotron charger 29, a transfer roller 30, and a cleaning brush 64.

  The scorotron charger 29 faces the photosensitive drum 27 with a predetermined interval. The scorotron charger 29 is a positively charged scorotron charger that generates corona discharge from a charging wire such as tungsten, and uniformly charges the surface of the photosensitive drum 27 to a positive polarity. The cleaning brush 64 is provided so as to face and contact the photosensitive drum 27. The cleaning brush 64 is composed of a conductive member, and is applied with a bias voltage from a high voltage power circuit board 130 described later, and serves to remove paper dust adhering to the photosensitive drum 27.

  As shown in FIG. 1, the fixing unit 18 is located on the downstream side of the process cartridge 17. The fixing unit 18 heat-fixes the toner transferred on the paper 3 in the process cartridge 17 using the heating roller 41 and the pressing roller 42, and then transports the paper 3 to the paper discharge path 44 by the transport roller 43. To do.

2. Configuration for Power Supply to Process Cartridge 17 A configuration for power supply to process cartridge 17 will be described with reference to FIGS. 1 to 6. (1) Configuration on Process Cartridge 17 Side of Process Cartridge 17 Opposed to Guide Plate 95 As shown in FIG. 4, the side plate 60 includes an electrode 120 a connected to the cleaning brush 64, an electrode 120 b connected to the grid electrode 29 a of the scorotron charger 29, and an electrode connected to the charging wire of the scorotron charger 29. 120c are arranged close to each other. Hereinafter, when these electrodes 120a, 120b, and 120c are collectively referred to, reference numeral 120 is given for explanation.

(2) Configuration on the Main Body Frame 2 As shown in FIG. 3, the guide plate 95 of the main body frame 2 includes a power supply member 121a for the cleaning brush 64, a power supply member 121b for the grid electrode 29a of the scorotron charger 29, In addition, the power supply member 121 c for the charging wire of the scorotron charger 29 is arranged side by side along the guide plate 95. Note that the power supply members 121a, 121b, and 121c are collectively described with reference numeral 121.

  In the guide plate 95, slit-like openings (hereinafter referred to as slit openings 95a) are formed through the respective opposing positions of the electrodes 120a, 120b, and 120c of the process cartridge 17 in the mounted state. ing. As shown in FIG. 3, the three power supply members 121 are arranged side by side along the back side of the guide plate 95 that does not face the process cartridge 17, and the terminal portions 122 on the front end side pass through the slit opening 95a. Are disposed so as to protrude toward the electrodes 120 of the process cartridge 17.

  Each power supply member 121 is formed of a wire material having conductivity and elasticity, and is mainly between a connection portion 123 on the proximal end side of the wire material, a terminal portion 122 on the distal end side of the wire material, and between the connection portion 123 and the terminal portion 122. Lead portion 124. In addition, as a material of a wire, there exist metal-type materials, such as stainless steel, common steel, copper, for example.

  Among these, as shown in FIG. 3, the connection portion 123 is formed by winding the base end portion of the wire in a coil shape, and the connection portion 123 is on the high voltage power circuit board 130 side as an example of the power supply device. Is electrically connected.

  The lead portions 124 of the three power supply members 121 are arranged side by side along the back side of the guide plate 95 while being substantially parallel to each other. Specifically, as shown in FIG. 3, the back surface of the guide plate 95 extends from the vicinity of the high voltage power circuit board 130 to the upper end side of the guide plate 95, bends in the middle, and straight to the vicinity of the slit openings 95a. A guide wall 95b is formed to rise. The lead portion 124 of each power supply member 121 is laid on the back surface of the guide plate 95 while being bent along the guide wall 95b. The lead portion 124 is fixed by a holding member 95c provided on the back surface of the guide plate 95, and the leading end of the lead portion 124 is a free end.

  When the process cartridge 17 is mounted on the main body frame 2, the terminal portion 122 of the power supply member 121 a contacts the electrode 120 a connected to the cleaning brush 64, and a bias voltage is applied to the cleaning brush 64 from the high voltage power circuit board 130. The Further, the terminal portion 122 of the power supply member 121b comes into contact with the electrode 120b connected to the grid electrode 29a of the scorotron charger 29, and a bias voltage is applied to the grid electrode 29a from the high voltage power circuit board 130. Further, the terminal portion 122 of the power supply member 121c comes into contact with the electrode 120c connected to the charging wire of the scorotron charger 29, and a bias voltage is applied to the charging wire from the high voltage power circuit board 130. Note that the level of the bias voltage differs between the cleaning brush 64, the grid electrode 29a, and the charging wire.

  Of the back surface of the guide plate 95, the area A shown in FIG. 3 is enlarged and shown in FIG. In this area A, the lead portion 124 of the power supply member 121b and the lead portion 124 of the power supply member 121c exist. A part of the lead portion 124 of the power supply member 121b is bent to approach the lead portion 124 of the power supply member 121c, and the distance r between the portions where the lead portions 124 are closest is a predetermined value R. (Minimum distance required to ensure electrical insulation between their respective lead portions 124).

  Of the back surface of the guide plate 95, a metal screw 127 as an example of a discharge suppressing member is located at an intermediate position between the lead portion 124 of the power feeding member 121b and the lead portion 124 of the power feeding member 121c. Screwed. Since the screw 127 is made of metal, it has good conductivity. Since the screw 127 and the power feeding members 121b and 121c are not in contact with each other and the guide plate 95 is made of an insulating resin, the screw 127 is electrically insulated from the surroundings. It should be noted that the distance between the closest parts is greater than the predetermined value R between the power supply members 121a and 121b or between the power supply members 121b and 121c. Since the insulation state is ensured, the screw 127 is not provided between them.

3. Configuration of High Voltage Power Supply Circuit Board 130 The configuration of the high voltage power supply circuit board 130 will be described with reference to FIGS. The high voltage power circuit board 130 has a configuration shown in FIG. That is, the high-voltage power circuit board 130 includes the high-voltage patterns 133 and 135 and the wire 137 as an example of a discharge suppressing member provided between the high-voltage patterns 133 and 135. As shown in FIG. 6B, the wire 137 is formed on the substrate body 132 made of an insulating resin and is not in contact with the high-voltage patterns 133 and 135. Therefore, the wire 137 is electrically insulated from the surroundings. Further, the distance between the high voltage patterns 133 and 135 is a predetermined value, that is, in the state where the wire 137 is not provided between the two adjacent high voltage patterns 133 and 135, Less than the minimum distance R required to ensure insulation.

4). Effects produced by the laser printer 1 (1) In the laser printer 1, a metal screw 127 that is electrically insulated from the surroundings is placed at an intermediate position between the lead portion 124 of the power supply member 121b and the lead portion 124 of the power supply member 121c. By providing, the discharge between them can be suppressed. Further, since the distance between the lead portion 124 of the power supply member 121b and the lead portion 124 of the power supply member 121c can be reduced, the main body frame 2 can be reduced in size.
(2) The metal screw 127 has a predetermined distance r, that is, two adjacent lead portions in a state where the metal screw 127 is not provided between the two adjacent lead portions 124. As shown in FIGS. 5 (a) and 5 (b), the lead portion 124 of the power supply member 121b and the power supply member 121c are disposed at a location that is less than the minimum distance R necessary for securing an electrical insulation state between the power supply members 124. Is provided at the closest part between the lead portion 124 and the other part where the mutual distance is equal to or greater than the predetermined value R, since the electrical insulation state is secured. Not. As a result, the place where the metal screw 127 is provided can be limited, and the cost is reduced.
(3) The laser printer 1 can suppress discharge between the high-voltage pattern 133 and the high-voltage pattern 135 by providing the wire 137 that is electrically insulated from the surroundings. In addition, since the distance between the high voltage pattern 133 and the high voltage pattern 135 can be reduced, the high voltage power circuit board 130 and the main body frame 2 can be reduced in size.
(4) In the high voltage power supply circuit board 130, the wire 137 has a predetermined distance between the high voltage patterns, that is, in the state where the wire 137 is not provided between two adjacent high voltage patterns, It is provided in a portion that is less than the minimum distance R necessary to ensure electrical insulation between the high-voltage patterns, but in a portion where the distance between the phase and high-voltage patterns is equal to or greater than a predetermined value R, electrical It is not provided because the insulation state is secured. As a result, the place where the wire 137 is provided can be limited, which reduces the cost.
<Second Embodiment>
1. Configuration of Laser Printer 1 The configuration of the laser printer 1 of the present embodiment is basically the same as that of the first embodiment, but differs in the configuration for supplying power to the process cartridge 17. In the following, the differences will be mainly described, and description of the same parts as those in the first embodiment will be omitted or simplified.

  In the present embodiment, the area A shown in FIG. 3 of the back surface of the guide plate 95 has the configuration shown in FIGS. That is, a part of the lead portion 124 of the power supply member 121b is bent and approaches the lead portion 124 of the power supply member 121c in a parallel state, and the lead portions 124 approach in a parallel state. The distance r of the part that is present is less than the predetermined value R. In this case, even if a metal screw 127 as shown in FIGS. 5 (a) and 5 (b) is screwed in, it is difficult to ensure electrical insulation over the entire region in parallel. Therefore, a portion of the back surface of the guide plate 95 that spans a portion where the lead portion 124 of the power supply member 121b and the lead portion 124 of the power supply member 121c are close to each other is dug down, and there is discharge suppression. As an example of the member, an integral (continuous) sponge (insulating porous member) 129 made of an insulating resin is attached. The portions where the lead portion 124 of the power supply member 121b and the lead portion 124 of the power supply member 121c are close to each other are in contact with the surface of the sponge 129. The sponge 129 has a larger surface roughness than a resin member that is not porous.

2. Effects produced by the laser printer 1 (1) The laser printer 1 includes the sponge 129 provided between the portions where the lead portion 124 of the power supply member 121b and the lead portion 124 of the power supply member 121c are close to each other. Can be suppressed. Further, since the distance between the lead portion 124 of the power supply member 121b and the lead portion 124 of the power supply member 121c can be reduced, the main body frame 2 can be reduced in size.
(2) The sponge 129 has a predetermined distance r, that is, electrical insulation between the two adjacent lead portions 124 when the sponge 129 is not provided between the two adjacent lead portions 124. Although provided between the lead portion 124 of the power supply member 121b and the lead portion 124 of the power supply member 121c, which is less than the minimum distance R necessary for securing the state, the mutual distance is a predetermined value. Other portions that are equal to or greater than R are not provided because an electrical insulation state is secured. As a result, the place where the sponge 129 is provided can be limited, thereby reducing the cost.
<Third Embodiment>
1. Configuration of Laser Printer 1 The configuration of the laser printer 1 of the present embodiment is basically the same as that of the first embodiment, but differs in the configuration for supplying power to the process cartridge 17. In the following, the differences will be mainly described, and description of the same parts as those in the first embodiment will be omitted or simplified.

  In the present embodiment, the area A shown in FIG. 3 of the back surface of the guide plate 95 has the configuration shown in FIGS. The lead portion 124 of the power supply member 121b is a wire material as in the first embodiment, but the lead portion 124 of the power supply member 121c is a metal plate. In this metal plate, an end portion 139 facing the lead portion 124 of the power supply member 121b is hemmed. Of the metal plate, portions other than the end portion 139 are parallel to the back surface of the guide plate 95. Further, the longitudinal direction of the metal plate is parallel to the lead portion 124 of the power supply member 121b.

2. Effects produced by the laser printer 1 (1) In the laser printer 1, the lead portion 124 of the power supply member 121c is made of the metal plate having the shape described above, whereby the lead portion 124 of the power supply member 121b and the lead portion 124 of the power supply member 121c. Can be suppressed. Further, since the distance between the lead portion 124 of the power supply member 121b and the lead portion 124 of the power supply member 121c can be reduced, the main body frame 2 can be reduced in size.
(2) When the lead portion 124 of the power supply member 121 is a metal plate having the shape described above, the mutual distance r is a predetermined value, that is, the lead portion 124 of the power supply member 121 is not a metal plate having the shape described above. Regarding the lead portion 124 of the power supply member 121b and the lead portion 124 of the power supply member 121c, which are less than the minimum distance R necessary for ensuring electrical insulation between the two adjacent lead portions 124, Although it is applied, it is not applied to other parts where the mutual distance is equal to or greater than the predetermined value R because the electrical insulation state is secured. As a result, the place where the lead portion 124 of the power supply member 121 is used as the metal plate having the above-described shape can be limited, thereby reducing the cost.

In addition, this invention is not limited to the said embodiment at all, and it cannot be overemphasized that it can implement with a various aspect in the range which does not deviate from this invention.
For example, in the first embodiment, the metal screw 127 may be attached between the electrode 120a and the electrode 120b or between the electrode 120a and the electrode 120c in the side plate 60 of the process cartridge 17. Good. Also in this case, the metal screw 127 is electrically insulated from the surroundings. With the metal screw 127, discharge between the electrode 120a and the electrode 120b or between the electrode 120a and the electrode 120c can be suppressed. Further, since the distance between the electrodes 120 can be reduced, the process cartridge 17 can be reduced in size.

In the first embodiment, instead of the metal screw 127, another metal member (for example, a metal pin, a metal plate, a metal ball, a metal bar, etc.) may be used.
In the first embodiment, instead of the wire 137, another metal member (for example, a metal screw, a metal pin, a metal plate, a metal ball, or the like) may be used.

  In the second embodiment, the sponge 129 may be attached to a portion of the side plate 60 of the process cartridge 17 that straddles the electrode 120a and the electrode 120b or a portion that straddles the electrode 120a and the electrode 120c. . In this case, the sponge 129 can suppress discharge between the electrode 120a and the electrode 120b or between the electrode 120a and the electrode 120c. Further, since the distance between the electrodes 120 can be reduced, the process cartridge 17 can be reduced in size.

  In the third embodiment, the power supply member 141 a extending from the cleaning brush 64 to the electrode 120 a, the power supply member 141 b extending from the grid electrode 29 a of the scorotron charger 29 to the electrode 120 b, and the charging wire of the scorotron charger 29 Of the power supply member 141c (see FIG. 4) reaching the electrode 120c, one can be a metal plate and the other two can be wires. And the edge part which opposes the adjacent electric power feeding member among the metal plates can be hemming-bended. In this case, discharge between the power feeding members 141a, 141b, and 141c can be suppressed. In addition, since the distance between the power supply members 141a, 141b, and 141c can be reduced, the process cartridge 17 can be reduced in size.

1 ... laser printer, 2 ... body frame, 3 ... paper,
4 ... Feeder unit, 5 ... Image forming unit, 16 ... Scanner unit,
17 ... Process cartridge, 18 ... Fixing section, 26 ... Drum cartridge,
27 ... photosensitive drum, 28 ... developing cartridge, 29 ... scorotron charger,
29a ... Grid electrode, 30 ... Transfer roller, 41 ... Heating roller 41,
42 ... Pressing roller, 43 ... Conveying roller, 44 ... Discharge path,
51 ... cartridge frame, 60 ... side plate, 64 ... cleaning brush,
93 ... front cover, 95 ... guide plate, 95a ... slit opening,
95b ... guide wall, 95c ... restraining member,
120, 120a, 120b, 120c ... electrodes,
121, 121a, 121b, 121c ... feeding member,
122 ... terminal part, 123 ... connection part, 124 ... lead part,
127 ... Screws, 129 ... Sponge, 130 ... High voltage power circuit board,
133, 135 ... high pressure pattern, 137 ... wire, 139 ... end,
141a, 141b, 141c ... feeding member

Claims (8)

The body,
A process cartridge detachably attached to the main body;
A power supply device provided in the main body;
A plurality of electrodes provided in the process cartridge;
A plurality of power supply members provided corresponding to each of the plurality of electrodes, and connecting the electrodes and the power supply device;
A discharge suppressing member provided between two adjacent electrodes or between two adjacent power supply members;
An image forming apparatus comprising:   The image forming apparatus according to claim 1, wherein the discharge suppression member is a metal member that is electrically insulated from the surroundings. Two adjacent electrodes or two adjacent power supply members are in contact with the surface of a continuous member,
The discharge suppression member is an insulating porous member provided between the two adjacent electrodes or between the two adjacent power feeding members among the surfaces of the continuous members. The image forming apparatus according to claim 1, wherein:   The discharge suppression member is provided between two adjacent electrodes whose distance is less than a predetermined value or between two adjacent power supply members whose distance is less than a predetermined value. The image forming apparatus according to claim 1, wherein the image forming apparatus is an image forming apparatus. The body,
A process cartridge detachably attached to the main body;
A power supply device provided in the main body;
A plurality of electrodes provided in the process cartridge;
A plurality of power supply members provided corresponding to each of the plurality of electrodes, and connecting the electrodes and the power supply device;
With
One of the two adjacent electrodes or the power feeding member is constituted by a metal plate, the other is constituted by a metal wire, and an end portion of the metal plate facing the other is hemmed and bent. apparatus.   The image forming apparatus according to claim 5, wherein the metal plate and the metal wire are provided in a portion where a distance between two adjacent electrodes or the power feeding member is less than a predetermined value. The body,
A process cartridge detachably attached to the main body;
A high-voltage board provided in the main body and supplying power to the process cartridge;
With
The high-pressure substrate is
Multiple high-pressure patterns;
A metal member provided between the two adjacent high-voltage patterns and electrically insulated from the surroundings;
An image forming apparatus comprising:   The image forming apparatus according to claim 7, wherein the metal member is provided between two adjacent high voltage patterns whose mutual distance is less than a predetermined value.