JP2012063615A - Charging device, image forming apparatus, and manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a charging device that prevents the occurrence of deflection, distortion, and deformation on a grid; keeps a constant interval between the outer peripheral surface of a photoconductor drum and the grid through the entire range of the grid; and prevents the occurrence of charging unevenness on the outer peripheral surface of the photoconductor drum, as well as an image forming apparatus, and a manufacturing method.SOLUTION: A grid case 13 having a grid 27 is externally fitted to a box-shaped accommodating member 12 that accommodates a discharge electrode so that the side wall of the accommodating member 12 and the grid case 13 are held in a contact state, thereby preventing the occurrence of deflection, distortion, and deformation of the grid case 13 and the grid 27.

Description

  The present invention relates to a charging device that charges an outer peripheral surface of a photosensitive drum, an image forming apparatus including the charging device, and a method of manufacturing a component of the charging device.

  In recent years, an electrophotographic image forming apparatus has become widespread, but the electrophotographic image forming apparatus is equipped with a charger for charging a photoreceptor. In general, a non-contact charging type charger is used, and the non-contact charging type charger is used to charge the surface of the photosensitive member to a predetermined potential by corona discharge.

  On the other hand, Patent Document 1 discloses a corona charging device that reduces the number of parts by reducing the number of parts by pairing a discharge electrode and a control grid, is easy to assemble, and reduces the number of assembly steps.

  Further, Patent Document 2 discloses a scorotron charging electrode in which a pair of plate-like shield portions arranged opposite to each other with a discharge electrode interposed therebetween and a plate-like grid electrode portion having a plurality of openings are integrally formed. Yes.

  Further, Patent Document 3 discloses a structure of a precharger in which a chassis surrounding a corona wire and a grid for controlling the potential of the surface of the photosensitive member are integrated into a “U” shape.

  Patent Document 4 discloses a charging device for an electrophotographic camera in which a shield electrode and a grid electrode surrounding a wire electrode that performs corona discharge are integrally formed.

JP-A-8-123135 Japanese Utility Model Publication No. 2-5763 Japanese Utility Model Publication No. 1-128260 Japanese Utility Model Publication No. 62-140544

  On the other hand, in general, the photoconductor has a roller shape, and a grid (or grid electrode) of a charger for charging the outer peripheral surface of the photoconductor is formed in a long strip shape along the rotation axis direction of the photoconductor. Yes. In addition, the grid or grid electrode of the charger is plate-shaped. For this reason, the grid or grid electrode of the charger is likely to be bent, distorted or deformed. As a result, the gap between the grid or the grid electrode of the charger and the outer peripheral surface of the photosensitive member varies, which causes a problem that uneven charging occurs on the outer peripheral surface of the photosensitive member. Further, Patent Documents 1 to 4 do not disclose how to deal with such a problem.

  This invention is made | formed in view of such a situation, The place made into the objective is the said grid by being fitted by the box-shaped accommodation member which accommodates a discharge electrode, and providing the grid member which has a grid. Can be prevented from being bent, distorted, deformed, etc., and the distance from the outer peripheral surface of the photosensitive drum can be made constant over the entire range of the grid, and uneven charging occurs on the outer peripheral surface of the photosensitive drum. Accordingly, it is an object of the present invention to provide a charging device and an image forming apparatus that can prevent this.

  According to another aspect of the present invention, in the manufacturing method for manufacturing a grid member included in the charging device, the grid and the exhaust port are formed in one step by forming the grid and the exhaust port of the grid member by etching. The object of the present invention is to provide a manufacturing method that can reduce the number of steps formed and reduce the working time.

  A charging device according to the present invention includes a box-shaped housing member that houses a discharge electrode and has an opening on one surface facing the photoconductive drum, and charges the outer peripheral surface of the photoconductive drum. A grid member having a grid that fits outside and covers the opening of the housing member is provided.

  In the present invention, a grid member having a grid is externally fitted to a box-shaped housing member that houses the discharge electrode, so that the side wall of the housing member and the grid member are held in contact with each other. The occurrence of bending, distortion, deformation and the like in the grid member and the grid is prevented.

  The charging device according to the present invention is characterized in that the grid member includes a hook-like outer fitting portion, and a connection portion that extends in a surface direction at an edge of the outer fitting portion and connects to a power source. And

  In the present invention, the grid member is connected to a power source through the connecting portion, and a voltage is applied from the power source to the external fitting portion (grid), and the outer peripheral surface of the photosensitive drum is charged.

  In the charging device according to the present invention, the housing member includes a reinforcing portion that reinforces the connecting portion.

  In the present invention, for example, when the grid member is externally fitted to the housing member, the reinforcing portion of the housing member reinforces the connection portion of the grid member to prevent the occurrence of bending, change, or the like.

  The charging device according to the present invention is characterized in that the connecting portion has a plate shape, and the reinforcing portion is configured to sandwich the connecting portion in a thickness direction of the connecting portion.

  In the present invention, for example, when the grid member is externally fitted to the housing member, the reinforcing portion of the housing member reinforces by bending the connecting portion of the grid member in the thickness direction, and is bent and changed. Prevent the occurrence of etc.

  In the charging device according to the present invention, the housing member has a rectangular parallelepiped shape, and is provided with a notch portion on a surface adjacent to the one surface, and the grid member allows gas in the housing member to pass through the notch portion of the housing member. An exhaust port for discharging is provided.

  In the present invention, for example, when gas is generated in the housing member due to discharge of the discharge electrode, the generated gas is discharged to the outside from the exhaust port of the grid member through the cutout portion of the housing member. The

  The charging device according to the present invention is characterized in that an exhaust port of the grid member has a mesh shape.

  According to the present invention, the exhaust port of the grid member has a mesh shape, and has an effect of reinforcing the exhaust port as compared with the case where the exhaust port is formed by cutting out a predetermined range. Suppression of deformation (or external fitting portion) and distortion is suppressed.

  An image forming apparatus according to the present invention is formed on the outer peripheral surface of the charging device according to any one of the foregoing inventions, a photosensitive drum whose outer peripheral surface is charged by the charging device, and the photosensitive drum. And a transfer device for transferring the toner image onto the recording sheet.

  In the present invention, the outer peripheral surface of the photosensitive drum is charged by the charging device, and a toner image is formed on the outer peripheral surface of the photosensitive drum. The toner image formed on the outer peripheral surface of the photosensitive drum is transferred onto a recording sheet by the transfer device.

  A manufacturing method according to the present invention is the manufacturing method for manufacturing the grid member provided in the charging device according to any one of the above-described inventions, wherein the grid and the exhaust port are formed by etching on a plate material to be formed into a bowl shape. A step of forming.

  In the present invention, when the grid member of the charging device is manufactured, the grid and the exhaust port of the grid member are formed by performing an etching process on the plate material. Thereafter, the grid member is manufactured by bending the plate material into a bowl shape.

  According to the present invention, the grid can be prevented from being bent, distorted, deformed, and the like, and the distance from the outer peripheral surface of the photosensitive drum can be made constant over the entire range of the grid. It is possible to prevent uneven charging from occurring on the outer peripheral surface of the body drum.

  According to the present invention, when the grid member included in the charging device is manufactured, the grid and the exhaust port are formed together in one step by forming the grid and the exhaust port of the grid member by etching. In addition to reducing the number, the working time can be shortened.

1 is a longitudinal sectional view schematically showing an overall configuration of a digital multifunction peripheral according to the present invention. FIG. 2 is a schematic diagram showing the periphery of a photosensitive drum of the digital multi-function peripheral of the present invention. It is a perspective view when the charger of the digital multifunction peripheral of the present invention is disassembled. It is a perspective view when the charger of the digital multi-functional peripheral of the present invention is assembled. In the digital multi-functional peripheral of the present invention, it is an explanatory diagram for explaining the connection between the grid case and the power supply. In the manufacturing process of the grid case of the digital multi-functional peripheral of the present invention, it is a diagram showing a state before the forming process of bending into a bowl shape after the etching process. It is sectional drawing by the YY line of FIG.

  Hereinafter, a charging device and an image forming apparatus including the charging device according to an embodiment of the present invention will be described in detail with reference to the drawings using a digital multi-function peripheral as an example.

  The image forming apparatus according to the present invention prints a copy of a document according to the image data of the document read by a scanner 8 described later, or image data from an external device such as a personal computer connected via a network. 1 is a digital multifunction peripheral 100 that prints an image based on the above.

  FIG. 1 is a longitudinal sectional view schematically showing the overall configuration of a digital multifunction peripheral 100 of the present invention. The digital multifunction peripheral 100 includes a charger 1, a photosensitive drum 2, a transfer device 3, a fixing device 4, a cleaning unit 5, a static elimination lamp 6, an exposure device 7, a scanner 8, and a paper feed tray 9. A developing device 10 and a paper discharge tray 20. FIG. 2 is a schematic view showing the periphery of the photosensitive drum 2 of the digital multifunction peripheral 100 of the present invention.

  The photosensitive drum 2 is made of, for example, a metal such as aluminum, and is provided so as to be rotationally driven in the direction of the arrow around the axis. It is. The outer peripheral surface of the photosensitive drum 2 is charged to a predetermined polarity and potential by the charger 1.

  The transfer unit 3 is a rectangular parallelepiped case 31 having an opening on one side facing the photosensitive drum 2, and is supported by the other side of the case 31 in the case 31 and facing the one side, and is made of an epoxy or the like. It consists of a discharge electrode 32 provided on the substrate. The discharge electrode 32 includes, for example, a wire-like or sawtooth-shaped discharge tip, and is connected to a power source (not shown). When a high voltage (for example, a negative high voltage) is applied to the transfer unit 3, a corona discharge is generated from the front end of the discharge, and the back surface of the recording paper P passing between the photosensitive drum 2 and the transfer unit 3 is charged. The toner image formed on the outer peripheral surface of the photosensitive drum 2 is transferred onto the recording paper P.

  The fixing device 4 includes a fixing roller 41 and a pressure roller 42. The fixing roller 41 is provided so as to be rotatable about an axis, and has a heating member therein, and a toner T constituting an unfixed toner image carried on the recording paper P conveyed from the transfer device 3. It is heated and melted and fixed on the recording paper P. The fixing roller 41 includes, for example, a core metal and an elastic layer. The core metal is formed of a metal such as iron, stainless steel, or aluminum. The elastic layer is formed of an elastic material such as silicone rubber or fluorine rubber, for example. A halogen lamp, an infrared lamp, or the like can be used as the heating member.

  The pressure roller 42 is rotatably supported and is provided so as to be in pressure contact with the fixing roller 41. The pressure roller 42 rotates following the rotation of the fixing roller 41. A pressure contact portion between the fixing roller 41 and the pressure roller 42 is a fixing nip portion. The pressure roller 42 fixes the toner image onto the recording paper P by pressing the molten toner T against the recording paper P when the fixing roller 41 heat-fixes the toner image onto the recording paper P. Facilitate.

  In the fixing device 4, when the recording paper P to which the toner image is transferred passes through the fixing nip portion, the toner T constituting the toner image is melted and pressed against the recording paper P, thereby recording the toner image. It is fixed on the paper P. The recording paper P on which the toner T is fixed is discharged to the paper discharge tray 20 and stacked.

  The cleaning unit 5 has a cleaning blade (not shown) and a toner storage tank (not shown), and cleans the outer peripheral surface of the photosensitive drum 2 after transferring the toner image. The cleaning blade is, for example, a rectangular member and is a plate-like member provided so that an edge on one side abuts the outer peripheral surface of the photosensitive drum 2. After the toner image is transferred to the recording paper P, the photosensitive drum The toner T, paper dust and the like remaining on the outer peripheral surface 2 are removed from the outer peripheral surface of the photosensitive drum 2. The toner storage tank is a container-like member having an internal space, and temporarily stores the toner removed by the cleaning blade.

  The neutralization lamp 6 optically neutralizes the charge remaining on the outer peripheral surface of the photosensitive drum 2 after the cleaning process by the cleaning unit 5.

  The exposure device 7 irradiates the outer peripheral surface of the charged photosensitive drum 2 with signal light corresponding to image data from the scanner 8 or image data from an external device. As a result, an electrostatic latent image corresponding to the image data is formed on the outer peripheral surface of the photosensitive drum 2. The exposure unit 7 uses an optical scanning device including a light source. The optical scanning device is, for example, a device that combines a light source, a polygon mirror, an fθ lens, a reflection mirror, and the like. As the light source, for example, a semiconductor laser, an LED array, an electroluminescence (EL) element, or the like can be used.

  The scanner 8 is provided with a document setting tray, an automatic document feeder (RADF, Reversing Automatic Document Feeder), and the like. The scanner 8 includes a document reading device, and the document reading device includes a document placing table and a document scanning device. The document placing table is a glass plate-like member for placing a document. The document scanning device includes a light source, a reflecting member, an optical lens, a line sensor (for example, Charge Coupled Device), and the like.

  The paper feed tray 9 is a tray that stores recording paper P such as plain paper, coated paper, color copy paper, and OHP film. A plurality of paper feed trays 9 are provided, and recording papers P of different sizes are accommodated in each paper feed tray 9.

  The recording paper P is supplied one by one from the paper feed tray 9 in synchronization with the transfer of the toner image by the rotation of the photosensitive drum 2 between the photosensitive drum 2 and the transfer device 3. Passes between the photosensitive drum 2 and the transfer device 3, whereby the toner image on the outer peripheral surface of the photosensitive drum 2 is transferred to the recording paper P. At this time, the toner image on the outer peripheral surface of the photosensitive drum 2 is smoothly transferred to the recording paper P by applying a high voltage having a polarity opposite to the charging polarity of the toner constituting the toner image to the transfer unit 3. .

  The charger 1 is a charging charger provided above the photosensitive drum 2 so as to face the outer peripheral surface of the photosensitive drum 2, and charges the outer peripheral surface of the photosensitive drum 2 to a predetermined polarity and potential. FIG. 3 is a perspective view when the charger 1 of the digital multifunction peripheral 100 of the present invention is disassembled, and FIG. 4 is a perspective view when the charger 1 of the digital multifunction peripheral 100 of the present invention is assembled.

  The charger 1 accommodates a discharge electrode 11 connected to a high-voltage power supply 14, a housing member 12 having an opening 16 provided on a rectangular surface 18 facing the photosensitive drum 2, and a grid 27 covering the opening 16. And a grid case 13 (grid member) that is externally fitted to the housing member 12.

  The accommodating member 12 of the charger 1 has a hollow rectangular parallelepiped shape, and is provided so that the longitudinal direction thereof is parallel to the axial direction of the photosensitive drum 2. The accommodating member 12 is made of a resin such as PP or PC.

  The housing member 12 has an opening 16 on a lower surface 18 facing the outer peripheral surface of the photosensitive drum 2. The opening 16 is a rectangle having a short dimension equal to the short dimension of the one surface 18 and a long dimension slightly shorter than the long dimension of the one surface 18. The opening 16 allows charged particles generated by the discharge of the discharge electrode 11 to pass through a grid 27 described later.

  Support portions 23, 23 that are in contact with and support a grid portion 19 of the grid case 13 described later when the grid case 13 is externally fitted to the housing member 12 at both edges on the short side of the opening 16. Is provided. When the grid case 13 is externally fitted to the housing member 12, the support portions 23 and 23 are in contact with the inside of the grid portion 19 to support the grid portion 19. Therefore, the bending of the grid portion 19 (grid 27) can be prevented, and the interval between the grid portion 19 and the outer peripheral surface of the photosensitive drum 2 in the axial direction of the photosensitive drum 2 is set over the entire range of the grid portion 19 (grid 27). Since it can be kept constant, charging unevenness on the outer peripheral surface of the photosensitive drum 2 is prevented.

  The side surfaces 24, 24 adjacent to the short sides of the one surface 18 are arranged to face each other, and the side surfaces 24, 24 hold the both ends of the linear discharge electrode 11, thereby accommodating the discharge electrode 11. It is installed in the member 12.

  On the other hand, in one of the side surfaces 25, 25 adjacent to both long sides of the one surface 18, so-called contaminated gas generated in the housing member 12 due to the discharge of the discharge electrode 11 is outside the housing member 12 (charger 1). Notches 17 and 17 are provided for exhausting the air. The cutout portions 17 and 17 are portions cut out in a rectangular shape from the lower side edge of the one side surface 25 and are formed at predetermined intervals.

  A reinforcing portion 26 that reinforces a connecting portion 22 of the grid case 13 described later is provided near the corner on the long side above the one side surface 25. The reinforcing portion 26 has a shape of a letter “U” in a longitudinal sectional view, and is a rectangular press-contact extending from the short side edge of the one side surface 25 so as to be flush with the surface. It consists of a plate 261 and a plate spring 262 to which a pressing force toward the pressing plate 261 is applied. The leaf spring 262 includes a base portion 263 connected to the upper end edge of the press contact plate 261 and a rectangular urging portion 264 extending downward from the base portion 263. The base 263 is bent toward the pressure contact plate 261, and the biasing portion 264 is biased toward the pressure contact plate 261 by the spring force obtained thereby. The pressure contact plate 261 and the leaf spring 262 are integrally formed.

  With the above configuration, when the grid case 13 is externally fitted to the housing member 12, the connecting portion 22 is sandwiched by the reinforcing portion 26. That is, the connection portion 22 is interposed between the pressure contact plate 261 and the leaf spring 262, and the pressure contact force from the pressure contact plate 261 and the leaf spring 262 is applied in the thickness direction of the connection portion 22, so that the connection portion 22 bends. To prevent.

  On the other hand, the grid case 13 includes an outer fitting portion 30 that is externally fitted and held on the housing member 12, and a connection portion 22 that extends in the surface direction at the edge of the outer fitting portion 30.

  The outer fitting portion 30 is formed from, for example, a stainless steel plate material, and has a bowl shape in which the plate material is bent. The outer fitting portion 30 is formed in a direction orthogonal to the rectangular plate-shaped grid portion 19 provided with the grid 27 through which the charged particles generated by the discharge of the discharge electrode 11 pass, and from both end edges on the long side of the grid portion 19. It consists of the bending parts 28 and 28 extended upwards. Moreover, the thickness of the outer fitting part 30 should just be about 1-0.05 mm, for example, and it is desirable that it is 0.1 mm.

  The grid 27 is formed in a mesh or slit shape, and the aperture ratio is set to about 50 to 90%. The grid 27 has a rectangular shape substantially equal to the opening 16 of the housing member 12, and covers the opening 16 of the housing member 12 when the grid case 13 is externally fitted to the housing member 12. In addition, the grid 27 is plated on the outer side facing the photosensitive drum 2 and the back side opposite thereto, so as to be prepared for corrosion caused by ozone caused by electric discharge.

  The grid portion 19 provided with the grid 27 is rectangular, the short dimension is equal to the short dimension of the one surface 18 of the housing member 12, and the long dimension is a rectangle slightly shorter than the long dimension of the one surface 18. When the grid case 13 is externally fitted to the housing member 12, as described above, the inner sides of both ends 191, 191 in the longitudinal direction of the grid portion 19 and the support portions 23, 23 of the housing member 12 come into contact with each other. Is supported. Accordingly, the bending of the grid portion 19 (and the grid 27) can be prevented, and the occurrence of uneven charging on the outer peripheral surface of the photosensitive drum 2 can be prevented.

  Further, when the grid case 13 (the outer fitting portion 30) is fitted on the housing member 12, the bent portions 28 and 28 are supported by the side surfaces 25 and 25 of the housing member 12, respectively. Specifically, when the grid case 13 is externally fitted to the housing member 12, the inner sides of the bent portions 28 and 28 are held in contact with the side surfaces 25 and 25, so the bent portions 28 and 28 are bent. There is no distortion.

  With the above configuration, in the charger 1 of the present invention, the distance between the grid portion 19 (grid 27) and the outer peripheral surface of the photosensitive drum 2 is kept constant over the entire range of the grid portion 19 (grid 27). It is possible to prevent uneven charging from occurring on the outer peripheral surface of the photosensitive drum 2.

  Further, either one of the bent portions 28 and 28 is provided with exhaust ports 21 and 21 for exhausting the pollutant gas generated by the discharge of the discharge electrode 11 to the outside of the charger 1. Specifically, when the grid case 13 (the outer fitting portion 30) is fitted to the housing member 12, the bent portion 28 that is in contact with the side surface 25 on which the notches 17 and 17 are formed is included in the outer fitting. Exhaust ports 21 and 21 are formed at positions aligned with the notches 17 and 17. The exhaust ports 21 and 21 have substantially the same shape as the notches 17 and 17.

  As described above, in the charger 1 of the present invention, the exhaust ports 21 and 21 are provided only in one of the bent portions 28 and 28. Therefore, when the charger 1 is arranged, the other bent portion 28 is arranged adjacent to the charge removal lamp 6 to prevent the influence of the charge removal light from the charge removal lamp 6 without using a shielding plate. I can do it.

A connecting portion 22 is provided in the vicinity of the corner on the long side above the one bent portion 28. The grid case 13 is connected to the power supply 15 by the connecting portion 22.
FIG. 5 is an explanatory diagram for explaining the connection between the grid case 13 and the power supply 15 in the digital multifunction peripheral 100 of the present invention. The connecting portion 22 is made of, for example, a stainless steel plate and extends from the short side edge of the one bent portion 28 so as to be flush with the surface. The connecting portion 22 is configured so that its width becomes narrower toward the tip. The tip of the connecting portion 22 is inserted inside a coiled connected spring C interposed between the power source 15 and connected to the connected spring C, whereby the power source 15 is connected via the connected spring C. Connected to.

In the charger 1 of the present invention, the grid portion 19 having the grid 27 and the bent portions 28 and 28 having the exhaust ports 21 and 21 are integrated, so the grid 27 and the exhaust ports 21 and 21 are integrated. Can be formed together by etching.
Specifically, before the plate material is bent into a bowl shape, the plate material is etched to form both the grid 27 and the exhaust ports 21 and 21 as shown in FIG. After the etching process, a forming process is performed in which the plate material is bent into a bowl shape along a dotted line in the figure. Therefore, the grid 27 and the exhaust ports 21 and 21 are formed together in one process (etching process), so that the number of processes can be reduced and the working time can be shortened.

7 is a cross-sectional view taken along line YY of FIG. Hereinafter, the reinforcement of the connecting portion 22 by the reinforcing portion 26 will be described.
The reinforcing portion 26 is provided with a plurality of pressure contact protrusions 265 projecting inwardly facing each other on inner surfaces of the urging portion 264 and the pressure contact plate 261. When the connecting portion 22 is sandwiched between the pressure contact plate 261 and the leaf spring 262, the biasing portion 264 is biased toward the pressure contact plate 261 by the spring force as described above. At this time, the plurality of press-contact projections 265 on the urging portion 264 side and the plurality of press-contact projections 265 on the press-contact plate 261 side press the connection portion 22 in a direction facing each other to hold the connection portion 22. Therefore, it is possible to prevent the connecting portion 22 from being bent.

Hereinafter, the operation of the charger 1 having the above configuration will be described.
When a negative high voltage, for example, 5 kV, is applied to the discharge electrode 11 from the high voltage power supply 14, an electric field concentrates on the tip of the discharge electrode 11 and corona discharge occurs. In the discharge region, both ions (charged particles) that are negatively charged due to ionization of a gas such as O ₂ and ozone in which O ₂ is dissociated and bonded are generated.

  Charged particles generated in the discharge region move along the electric field. At this time, when a negative voltage, for example, 650 V, which is weaker than the voltage applied to the discharge electrode 11 is applied to the grid case 13 by the power supply 15 via the connection portion 22, the charged particles are directed from the discharge electrode 11 toward the grid portion 19. Moving. The charged particles flow to the grid portion 19 at a certain rate, and the rest passes through the grid 27 and reaches the photosensitive drum 2. Thereby, the outer peripheral surface of the photosensitive drum 2 can be negatively charged. In this case, the grid case 13 functions as a so-called side electrode that stabilizes the discharge of the discharge electrode 11.

At this time, pollutant gases such as ozone and NO _x generated by the corona discharge are discharged from the exhaust ports 21 and 21 of the grid case 13 to the outside of the charger 1 through the notches 17 and 17 of the housing member 12. Is discharged.

  Furthermore, the configuration of the charger 1 of the present invention is not limited to the above description, and the notches 17 and 17 and the exhaust ports 21 and 21 may be mesh-shaped.

  Moreover, the reinforcement part 26, the connection part 22, and the to-be-connected spring C are not restricted to the shape mentioned above.

DESCRIPTION OF SYMBOLS 1 Charger 2 Photosensitive drum 3 Transfer device 6 Static elimination lamp 11 Discharge electrode 12 Housing member 13 Grid case (grid member)
DESCRIPTION OF SYMBOLS 14 High voltage power supply 15 Power supply 16 Opening 17 Notch part 18 One side 21 Exhaust port 22 Connection part 23 Support part 25 Side face 26 Reinforcement part 27 Grid 30 Outer fitting part 100 Digital compound machine

Claims (8)

In a charging device that houses a discharge electrode and includes a box-shaped housing member having an opening on one surface facing the photosensitive drum, and charges the outer peripheral surface of the photosensitive drum,
A charging device comprising: a grid member having a grid that is externally fitted to the housing member and covers an opening of the housing member. The grid member is
A hook-like outer fitting,
The charging device according to claim 1, further comprising: a connecting portion that extends in a surface direction at an edge of the outer fitting portion and is connected to a power source.   The charging device according to claim 2, wherein the housing member includes a reinforcing portion that reinforces the connection portion. The connecting portion has a plate shape,
The charging device according to claim 3, wherein the reinforcing portion is configured to sandwich the connecting portion in a thickness direction of the connecting portion. The housing member has a rectangular parallelepiped shape, and includes a notch on a surface adjacent to the one surface,
5. The charging device according to claim 1, wherein the grid member includes an exhaust port through which the gas in the housing member is discharged through a cutout portion of the housing member.   The charging device according to claim 5, wherein the exhaust port of the grid member has a mesh shape. A charging device according to any one of claims 1 to 6,
A photosensitive drum whose outer peripheral surface is charged by the charging device;
An image forming apparatus comprising: a transfer device that transfers a toner image formed on the outer peripheral surface of the photosensitive drum onto a recording sheet. In the manufacturing method which manufactures the grid member with which the charging device according to claim 5 or 6 is provided,
The manufacturing method characterized by including the process of forming the said grid and an exhaust port by the etching in the board | plate material which should be shape | molded in a bowl shape.

Images