JP5092856B2 - Electrophotographic photoreceptor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor capable of securing an electric continuity state between a conductive rotating base body and a conductive support shaft. <P>SOLUTION: A photoreceptor drum 61 includes: a drum body 110 having the cylindrical conductive rotating base body 111 and a photosensitive layer 112 on which an electrostatic latent image is formed by exposure, on the outer surrounding surface of the conductive rotating base body 111; a conductive drum shaft 120 arranged on the center axial line of the drum body 110; and a conductive member 140 which is fixed on the drum shaft 120, is extended toward the conductive rotating base body 111, is brought into sliding contact with the inner surrounding surface of the conductive rotating base body 111 and, thereby, conducts electricity between the drum shaft 120 and the conductive rotating base body 111. The drum body 110 is configured relatively rotatably to the conductive member 140 and the drum shaft 120. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an electrophotographic photoreceptor.

  In general, a photosensitive drum provided in an image forming apparatus such as a laser printer includes a drum body having a photosensitive layer on the surface (outer peripheral surface) of a cylindrical conductive rotating base, and flanges engaged with both ends of the drum body. And a drum shaft inserted into each flange along the central axis of the drum body. The drum shaft is supported by the image forming apparatus main body, and the drum main body is supported by the drum shaft via each flange so as to be relatively rotatable.

  By the way, in such a photosensitive drum, in order to form a good electrostatic latent image on the photosensitive layer, it is necessary to connect the drum body (conductive rotating base) to the ground. For example, in Patent Document 1, a plate-shaped ground electrode extending from the inner periphery of a ring-shaped ground plate electrically connected to the inner peripheral surface of the drum body toward the drum shaft is in sliding contact with the drum shaft. A configuration is disclosed in which the drum body and the drum shaft can be electrically connected.

JP 2000-181286 A

  However, in the above-described conventional configuration, the end portion of the plate-like earth electrode and the thin cylindrical drum shaft are brought into sliding contact, so that the contact area is reduced and the sliding contact is unstable. For this reason, if dirt or rust is generated at the contact point of the drum shaft with the ground electrode, or if foreign matter adheres to it, the ground electrode is momentarily separated from the drum shaft. And the drum shaft (conductive support shaft) easily become non-conductive.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electrophotographic photosensitive member that can ensure a conductive state between a conductive rotating base and a conductive support shaft.

In order to achieve the above-described object, the present invention provides a drum body having a cylindrical conductive rotating base, and a photosensitive layer on which an electrostatic latent image is formed by exposure on the outer peripheral surface of the conductive rotating base, a conductive support shaft arranged on the central axis of the drum body, is non-rotatably secured against the conductive support shaft, said drum body and said conductive support shaft extending toward said electrically conductive rotating substrate The drum body includes a conductive member that conducts the conductive support shaft and the conductive rotary base by slidingly contacting the inner peripheral surface of the conductive rotary base with relative rotation, and the drum body includes the conductive member and the conductive member. It is configured to be rotatable relative to the support shaft.

  According to the electrophotographic photosensitive member configured as described above, the inner peripheral surface of the conductive rotating base in which the end of the conductive member fixed to the conductive support shaft rotates relative to the conductive member and the conductive support shaft. Slid in contact. As a result, the contact area between the conductive member and the conductive rotating base can be increased and the sliding contact can be made stably as compared with the configuration in which the conductive support shaft and the conductive member are in sliding contact.

  According to the electrophotographic photosensitive member of the present invention, the contact area between the conducting member and the conductive rotating base can be increased and the sliding contact can be stably performed. It is possible to ensure a conduction state.

<Overall configuration of laser printer>
Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. In the drawings to be referred to, FIG. 1 is a cross-sectional view showing an overall configuration of a laser printer as an example of an image forming apparatus.
Here, in the following description, the direction will be described with reference to the user when using the laser printer. That is, in FIG. 1, the right side toward the paper surface is the “front” side, the left side toward the paper surface is the “rear” side, the back side toward the paper surface is the “right” side, and the front side toward the paper surface is “left”. ”Side. In addition, the vertical direction toward the page is the “vertical” direction.

  As shown in FIG. 1, the laser printer 1 includes a main body housing 2, a paper feeding unit 3 for feeding paper P (recording sheet), an exposure device 4, and a toner image (development) on the paper P. The process cartridge 5 for transferring the agent image) and the fixing device 8 for thermally fixing the toner image on the paper P are mainly provided.

  The paper feed unit 3 is disposed in the lower part of the main body housing 2 and is detachably mounted on the main body housing 2, and is swingable provided on the front side of the paper feed tray 31. A paper pressing plate 32, a paper feed roller 33, a paper feed pad 34, paper dust removing rollers 35 and 36, and a registration roller 37 provided mainly on the upper front side of the paper feed tray 31 are mainly provided. The paper P in the paper feed tray 31 is brought close to the paper feed roller 33 by the paper pressing plate 32 and sent out by the paper feed roller 33 and the paper feed pad 34, and the paper dust removing rollers 35 and 36 and the registration roller 37 are moved. After passing, they are conveyed one by one to a process cartridge 5 described later.

  The exposure apparatus 4 is arranged at the upper part in the main body housing 2 and mainly includes a laser light emitting unit (not shown), a polygon mirror 41 that is rotationally driven, lenses 42 and 43, and reflecting mirrors 44, 45, and 46. In preparation. The laser light based on the image data emitted from the laser light emitting part is reflected or passed through the polygon mirror 41, the lens 42, the reflecting mirrors 44 and 45, the lens 43, and the reflecting mirror 46 in this order, as indicated by the chain line, and is electrophotographic photosensitive. The surface of the photosensitive drum 61 as an example of the body is irradiated by high-speed scanning.

  The process cartridge 5 is disposed below the exposure apparatus 4 and is configured to be detachably mounted from an opening formed when the front cover 21 provided on the front side of the main body housing 2 is opened. The process cartridge 5 includes a drum cartridge 6 and a developing cartridge 7.

  The drum cartridge 6 mainly includes a photosensitive drum 61, a transfer roller 62, and a charger 63, which are rotatably supported by the drum case 60, in a hollow drum case 60 constituting an outer frame. A detailed configuration of the photosensitive drum 61 will be described later.

  The developing cartridge 7 is configured to be detachably attached to the drum cartridge 6 (drum case 60). The developing cartridge 7 mainly includes a developing roller 71 and a supply roller 72 rotatably supported by the developing case 70 and a layer thickness regulating blade 73 in the developing case 70, and has a toner containing portion 74. Yes.

  In the process cartridge 5 configured as described above, the surface of the photosensitive drum 61 is uniformly charged by the charger 63 and then exposed by high-speed scanning of the laser light from the exposure device 4. Thereby, the potential of the exposed part is lowered, and an electrostatic latent image based on the image data is formed.

  At this time, the toner in the toner container 74 is supplied onto the supply roller 72 and is supplied onto the developing roller 71 by the sliding contact between the supply roller 72 and the developing roller 71. The toner supplied onto the developing roller 71 enters between the developing roller 71 and the layer thickness regulating blade 73 by the rotation of the developing roller 71 and is carried on the developing roller 71 as a thin layer having a constant thickness.

  The toner carried on the developing roller 71 is supplied to the electrostatic latent image on the surface of the photoconductive drum 61 when the developing roller 71 and the photoconductive drum 61 face each other. As a result, the electrostatic latent image on the surface of the photosensitive drum 61 is visualized and a toner image is formed. Then, the sheet P is conveyed between the photosensitive drum 61 and the transfer roller 62, whereby the toner image on the surface of the photosensitive drum 61 is transferred onto the sheet P.

  The fixing device 8 is disposed behind the process cartridge 5 (on the downstream side in the conveyance direction of the paper P), and is disposed so as to face the heating roller 81 and sandwich the paper P between the heating roller 81 and the heating roller 81. The apparatus mainly includes a pressure roller 82 and a pair of conveyance rollers 83 provided on the downstream side of the heating roller 81 and the pressure roller 82 in the conveyance direction of the paper P. The toner transferred onto the paper P is thermally fixed while the paper P passes between the heating roller 81 and the pressure roller 82. The sheet P on which the toner image has been thermally fixed is conveyed to the sheet discharge path 91 by the conveyance roller 83 and the flapper 84, and the discharge formed on the upper surface of the main body housing 2 by the pair of sheet discharge rollers 92 from the sheet discharge path 91. The paper is discharged onto the paper tray 22.

<Configuration of photosensitive drum>
Next, a detailed configuration of the photosensitive drum 61 as an example of the electrophotographic photosensitive member of the present invention will be described. 2A and 2B are views showing the appearance of the photosensitive drum, FIG. 3A is a sectional view of the photosensitive drum, FIG. 2B is a perspective view of the drum shaft and the conductive member, and FIG. It is a perspective view which shows the external appearance of the conduction | electrical_connection member before inserting.

  As shown in FIG. 2, the photosensitive drum 61 includes a drum body 110, a drum shaft 120 as an example of a conductive support shaft disposed along the central axis of the drum body 110, and each end of the drum body 110. And flanges 130 and 150 engaged with each other.

  The drum main body 110 includes a conductive rotating base 111 (see FIG. 3A) having a cylindrical shape (a cylindrical shape coaxial with the drum shaft 120) formed of a conductive material such as aluminum. A photosensitive layer 112 on which an electrostatic latent image is formed by exposure is formed on the outer peripheral surface of the conductive rotating base 111.

  The drum shaft 120 is a rod-like (substantially columnar) member made of a conductive material such as metal, and both ends are supported by the drum case 60 of the drum cartridge 6. When the drum cartridge 6 (process cartridge 5) is attached to the main body housing 2, the drum shaft 120 is supported by the main body housing 2 (device main body). The drum shaft 120 is electrically grounded (see FIG. 3A).

The flanges 130 and 150 are formed of an insulating resin material, and are respectively attached to end portions of the drum main body 110 so as not to rotate with respect to the drum main body 110.
As shown in FIG. 3A, the flange 130 is integrally formed with a flange main body 131 and a bearing 132 through which the drum shaft 120 is inserted.

  The flange main body 131 is formed in a substantially cylindrical shape, and has an insertion portion 133 that is inserted into the drum main body 110 and a cylindrical shape that extends outward from the insertion portion 133 in the axial direction and has an outer diameter larger than the outer diameter of the drum main body 110. The gear part 134 is provided. A part of the inner periphery of the insertion portion 133 and the inner periphery of the gear portion 134 form a communicating through hole 131A, and the bearing 132 is supported by the through hole 131A. Gear teeth 134 </ b> A (see FIG. 2) are formed on the outer peripheral surface of the gear portion 134.

  As described above, the flanges 130 and 150 are non-rotatably attached to both ends of the drum main body 110 and are rotatably supported by the drum shaft 120, so that the drum main body 110 is connected to the drum shaft via the flanges 130 and 150. 120 is supported so as to be relatively rotatable. A driving force is input to the gear portion 134 of the flange 130 from a driving source such as a motor (not shown) provided in the main body housing 2, whereby the drum main body 110 and the flanges 130 and 150 (photosensitive drums). 61) is driven to rotate.

  As shown in FIGS. 3A and 3B, the photosensitive drum 61 includes a conductive member that conducts the drum body 110 and the drum shaft 120 in addition to the drum body 110, the drum shaft 120, and the flanges 130 and 130 described above. 140. The conducting member 140 is fixed to the drum shaft 120 and is disposed so as to extend toward the drum body 110 side.

  As shown in FIG. 4, the conducting member 140 includes a ring-shaped portion 141 through which the drum shaft 120 is inserted, and a substantially triangular protrusion 142 extending radially inward from two opposing locations on the inner periphery of the ring-shaped portion 141. , 142 and arm portions 143, 143 extending radially outward from two locations corresponding to the protrusions 142 on the outer periphery of the ring-shaped portion 141. Such a conducting member 140 is formed using a plate-like member made of a material having conductivity and spring properties such as phosphor bronze. 4 shows a state before being inserted into the drum main body 110. As shown in FIG.

  The inner diameter of the ring-shaped portion 141 is formed so as to be larger than the maximum outer diameter of the drum shaft 120, and the distance between the tip portions 142 A and 142 A of the projecting portions 142 and 142 facing each other is the maximum outer diameter of the drum shaft 120. It is formed to be smaller than that. Further, the end portion of each arm portion 143 has a curved portion 143A that is curved toward one side in the axial direction of the inserted drum shaft 120. The distance from one curved view 143 </ b> A to the other curved portion 143 </ b> A is formed to be larger than the inner diameter of the drum main body 110.

  Here, the operation of each part of the conductive member 140 will be described while explaining the assembly procedure of the photosensitive drum 61 of the present embodiment. FIG. 5 is a diagram for explaining a procedure for assembling the photosensitive drum. FIG. 5A is a diagram showing a state in which the conducting member into which the drum shaft is inserted is to be inserted into the drum body, and the drum shaft and the conducting member are connected to the drum. It is a figure (b) which shows a mode that it inserts in a main body, and a figure (c) which shows a mode that a flange is attached to a drum main body.

  As shown in FIG. 5A, first, the drum shaft 120 is inserted into the conducting member 140. At this time, since the distance between the tip end portions 142A of the protrusions 142 is set smaller than the maximum outer diameter of the drum shaft 120, the drum shaft 120 is press-fitted into the conducting member 140. The drum shaft 120 is inserted to a position where the protrusions 142 of the conducting member 140 engage with the recesses 121 and 121 formed on the drum shaft 120. By engaging each protrusion 142 of the conducting member 140 and each recess 121 of the drum shaft 120, the conducting member 140 is supported and fixed to the drum shaft 120 so as not to rotate.

  Next, the drum shaft 120 to which the conducting member 140 is fixed is inserted into the drum main body 110. Then, as shown in FIG. 5B, each arm portion 143 bends to the opposite side (axially outer side) from the insertion direction, and each curved portion 143A becomes the inner peripheral surface of the drum main body 110 (conductive rotating base 111). 110A is contacted. The arm portion 143 is bent in the process of insertion into the drum main body 110, and thus acts as a leaf spring that urges the bending portion 143A toward the inner peripheral surface 110A by a force for returning to the original shape. Thus, the bending portion 143A comes into elastic contact with the inner peripheral surface 110A of the drum main body 110. The curved portion 143A is an example of a sliding contact portion.

  Finally, as shown in FIG. 5C, flanges 130 and 150 (only the flange 130 is shown in FIG. 5C) are attached. The flange 130 is attached to the end of the drum body 110 by inserting the drum shaft 120 into the bearing 132 and then inserting the insertion portion 133 into the drum body 110.

  The effects of the photosensitive drum 61 configured as described above will be described. FIG. 6 is a diagram showing a configuration of a conventional photosensitive drum. FIG. 6A shows a state in which the drum shaft and the ground electrode are in sliding contact with each other, and the ground electrode is moved from above the drum shaft by the force pressing the ground electrode against the drum shaft. FIG. 7B is a diagram illustrating a state of escaping, and FIG. 7 is a diagram illustrating a state in which the curved portion of the conductive member according to the present embodiment and the inner peripheral surface of the drum body are in sliding contact.

  When the driving force is input to the gear unit 134 during the operation of the laser printer 1, the photosensitive drum 61 (the drum main body 110 and the flanges 130 and 150) rotates. At this time, the inner peripheral surface 110 </ b> A of the rotating drum main body 110 slides with respect to the curved portion 143 </ b> A of the conducting member 140 fixed to the drum shaft 120. Thus, the drum main body 110 and the drum shaft 120 are electrically connected via the conducting member 140, whereby the drum main body 110 is electrically grounded.

  According to this embodiment, each curved portion 143A of the conducting member 140 fixed to the drum shaft 120 and the inner peripheral surface 110A of the drum body 110 that rotates relative to the conducting member 140 and the drum shaft 120 are in sliding contact. Accordingly, the contact area between the conducting member 140 and the drum main body 110 can be increased and the sliding contact can be stably performed as compared with the conventional configuration in which the drum shaft and the ground electrode are in sliding contact.

  More specifically, as shown in FIG. 6A, in the conventional configuration, the plate-shaped ground electrode 940 is brought into sliding contact with the substantially cylindrical thin drum shaft 920, that is, the arc-shaped convex portion. Therefore, there is only one contact point C, and it is difficult to secure a contact area. Further, as shown in FIG. 6B, the force that presses the ground electrode 940 against the drum shaft 920 acts as a force for the ground electrode 940 to escape from the drum shaft 920 that is an arcuate convex portion. And the drum shaft 920 are unstable in sliding contact (contact).

  On the other hand, in the present embodiment, as shown in FIG. 7, the plate-like conductive member 140 (curved portion 143A) is slidably contacted with the cylindrical inner peripheral surface 110A, that is, the arc-shaped concave portion, so The contact points C and C can be secured, and the contact area can be increased. Further, the force that presses the curved portion 143A against the inner peripheral surface 110A acts as a force that the curved portion 143A tries to fit on the inner peripheral surface 110A that is an arcuate concave portion. (Contact) can be stabilized.

  Thereby, since the contact between the bending portion 143A and the inner peripheral surface 110A can be reliably ensured, the conduction state between the drum main body 110 and the drum shaft 120 can be favorably ensured. As a result, a good electrostatic latent image can be formed on the photosensitive layer 112 of the photosensitive drum 61, and the image quality of the laser printer 1 having such a photosensitive drum 61 can be improved.

  Further, since the conducting member 140 has two (a plurality of) curved portions 143A (sliding contact portions) that are in sliding contact with the inner peripheral surface 110A of the drum main body 110, one sliding contact portion is temporarily the inner peripheral surface of the drum main body 110. Even if dirt, rust, foreign matter, etc. between 110A and the non-conductive state, the conductive state can be secured at the remaining sliding contact portion.

  Furthermore, since the conducting member 140 (curved portion 143A) is in elastic contact with the inner peripheral surface 110A of the drum main body 110, contact (sliding contact) between the curved portion 143A and the inner peripheral surface 110A is more reliably ensured. can do. Even if the conducting member 140 momentarily flies (separates) from the inner peripheral surface 110A due to foreign matters attached to the contact location, the bending portion 143A can be brought into contact with the inner peripheral surface 110A again.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to above-described embodiment. About a concrete structure, it can change suitably in the range which does not deviate from the meaning of this invention.

  In the above-described embodiment, each arm portion 143 of the conducting member 140 before being inserted into the drum main body 110 is linear with the ring-shaped portion 141 as shown in FIG. The present invention is not limited to this. That is, each arm portion 143 may have a shape that is slightly bent to the side opposite to the insertion direction before being inserted into the drum main body 110.

  In the above-described embodiment, in order to press-fit the drum shaft 120, the two protrusions 142 are provided on the ring-shaped portion 141, and the conductive member 140 is formed by extending the arm portion 143 from the outer periphery of the ring-shaped portion 141. The shape of the conducting member is not limited to this. For example, it is good also as a shape which extended the arm part from the outer periphery of what is called an E ring.

  In the above-described embodiment, the example in which the drum shaft 120 is press-fitted into the conducting member 140 and the conducting member 140 is fixed to the drum shaft 120 by the engagement between the protrusion 142 and the recess 121 has been described. The method is not limited to this. For example, like the conducting member 240 shown in FIGS. 8A and 8B, the connection portion 241 having a circular arc shape when viewed from the front (a shape along the outer peripheral surface of the drum shaft 120) is welded to the drum shaft 120. It may be fixed with. Further, the connecting portion 241 may be fixed by adhering to the drum shaft 120 with a conductive adhesive or tape. The conducting member 240 includes a connecting portion 241 and one arm portion 143 extending from one end of the connecting portion 241 in the axial direction. In FIGS. 8A and 8B, two conducting members 240 are provided. Are fixed to the drum shaft 120 with the circumferential ends of the connecting portions 241 facing each other.

  In the above-described embodiment, the conductive members 140 and 240 are exemplified, but the conductive member of the present invention is not limited to this. Hereinafter, modified examples of the conductive member will be briefly described. In the following description, the same reference numerals are given to the same configurations as those in the above-described embodiment, and the description thereof is omitted.

  For example, like the conducting member 340 shown in FIG. 9A, the arm portion 143 has three arm portions 143, and each arm portion 143 extends radially around the drum shaft 120 so as to be at the same angle (120 degrees). It is good also as a structure. Further, like the conducting member 440 shown in FIG. 9B, the arm member 143 has four arm portions 143, and each arm portion 143 extends radially so as to be at an angle (90 degrees) with respect to the drum shaft 120. It is good also as a structure. According to this, since each arm part 143 can make uniform the force which presses 110 A of internal peripheral surfaces and the drum axis | shaft 120, a deformation | transformation of the drum main body 110 and the drum axis | shaft 120 can be prevented. The same effect can be applied to the conductive members 140 and 240 of the above-described embodiment. Further, the number of arm portions 143 may be five or more.

  Further, as another example of a configuration for securing a plurality of sliding contact portions, a plurality of sliding contacts provided by branching from an end portion of one arm portion 541 as in a conducting member 540 shown in FIG. A structure including the portion 542 may be employed. According to this, even if one sliding contact portion 542 is in a non-conductive state, the other sliding contact portion 542 can ensure a conductive state. Further, a plurality of arm portions 541 may be provided like a conducting member 540A shown in FIG. In this case, it is desirable to have a configuration in which the plurality of arm portions 541 extend radially from the drum shaft 120 so that they are at the same angle.

  As another example of the sliding contact portion, a conductive brush 642 provided at the end of the arm portion 641 may be elastically contacted like a conductive member 640 shown in FIG. Good. In such a configuration, at least the brush 642 and the inner peripheral surface 110A need only be in sliding contact with each other, and thus the arm portion 641 may have a length that does not reach the inner peripheral surface 110A.

  Further, as another example of the sliding contact portion, a configuration in which a large number of conductive hairs 742 (conductive fibers) are extended from the drum shaft 120 to the drum main body 110 side like a conductive member 740 shown in FIG. It is good. Specifically, the conductive member 740 mainly includes a sheet-like base portion 741 having conductivity and a large number of hairs 742 provided so as to grow from the base portion 741. The base 741 is bonded to the drum shaft 120 with a conductive adhesive or tape. Each bristle 742 has a sufficient length so that it can slide in contact with the inner peripheral surface 110 </ b> A even when the base 741 is bonded to the drum shaft 120. It should be noted that it is desirable to fill the drum body 110 to some extent with a large number of hairs 742.

According to the conducting members 640 and 740, a large number of contact points with the inner peripheral surface 110A can be secured, so that the conducting state between the drum main body 110 and the drum shaft 120 can be reliably secured. In addition, since the load between the sliding contact portion and the inner peripheral surface 110A can be reduced, the rotational torque of the photosensitive drum (conductive rotating base) can be reduced. Furthermore, since the frictional noise between the sliding contact portion and the inner peripheral surface 110A can be reduced, the generation of noise can be suppressed.
In addition, such a sliding contact part is not limited to the brush 642 or the hair 742, For example, a conductive nonwoven fabric, a conductive sheet, a conductive film, etc. may be sufficient.

  Further, the conductive member (sliding contact portion) is not limited to a plurality as in the above-described configuration, and may be one. For example, it is good also as a structure provided with only one above-mentioned conduction member 240. FIG.

  In the above-described embodiment, the laser printer 1 that forms a monochromatic image is exemplified as an example of the image forming apparatus provided with the photosensitive drum 61 (electrophotographic photosensitive member). However, the image forming apparatus provided with the electrophotographic photosensitive member is illustrated as an example. It is not limited to this. For example, it may be a copying machine or a multifunction machine that forms a single color image, or may be a printer, a copying machine, or a multifunction machine that forms a multicolor image (color image).

1 is a cross-sectional view illustrating an overall configuration of a laser printer as an example of an image forming apparatus. It is a figure which shows the external appearance of a photoconductive drum. (A) is sectional drawing of a photoconductive drum, (b) is a perspective view of a drum axis | shaft and a conduction member. It is a perspective view which shows the external appearance of the conduction | electrical_connection member before inserting in a drum main body. It is a figure for demonstrating the assembly procedure of a photoreceptor drum, the figure (a) which shows a mode that it is going to insert the conduction | electrical_connection member in which the drum axis | shaft was inserted in a drum main body, and a drum axis | shaft and a conduction | electrical_connection member inserted in a drum main body (B) which shows a mode to perform, and (c) which shows a mode that a flange is attached to a drum main body. It is a figure which shows the structure of the conventional photoconductive drum, The figure (a) which shows a mode that a drum axis | shaft and a ground electrode slide-contact, and a mode that a ground electrode escapes on a drum axis | shaft by the force which presses a ground electrode to a drum axis | shaft It is a figure (b) shown. It is a figure which shows a mode that the curved part of the conduction | electrical_connection member which concerns on embodiment of this invention, and the internal peripheral surface of a drum main body are slidably contacted. (A) is sectional drawing of a photoconductive drum provided with the conduction member concerning a modification, (b) is a perspective view of the conduction axis concerning a drum axis and a modification. (A) And (b) is sectional drawing of a photoconductor drum provided with the conduction member concerning other modifications. (A) And (b) is sectional drawing of a photoconductor drum provided with the conduction member concerning another modification. (A) And (b) is sectional drawing of a photoconductor drum provided with the conduction member concerning another modification.

Explanation of symbols

61 Photosensitive drum 110 Drum body 110A Inner peripheral surface 111 Conductive rotating base 112 Photosensitive layer 120 Drum shaft 140 Conducting member 143 Arm portion 143A Bending portion 240 Conducting member 340 Conducting member 440 Conducting member 540 Conducting member 540A Conducting member 542 Sliding portion 640 Conducting member 642 Brush 740 Conducting member 742 Hair

Claims (7)

A drum body having a cylindrical conductive rotating substrate, and a photosensitive layer on which an electrostatic latent image is formed by exposure on the outer peripheral surface of the conductive rotating substrate;
A conductive support shaft disposed on the central axis of the drum body;
Non-rotatably fixed against the conductive support shaft in sliding contact with the inner peripheral surface of the electrically conductive rotating body with the relative rotation of the conductive support shaft and the drum body extending toward the electrically conductive rotating substrate A conductive member for conducting the conductive support shaft and the conductive rotating base,
The electrophotographic photosensitive member, wherein the drum body is configured to be rotatable relative to the conducting member and the conductive support shaft.   2. The electrophotographic photosensitive member according to claim 1, wherein the conductive member has a plurality of sliding contact portions that are in sliding contact with an inner peripheral surface of the conductive rotating base.   The electrophotographic photosensitive member according to claim 1, wherein the conductive member is in elastic contact with an inner peripheral surface of the conductive rotating base. The conducting member has a plurality of arm portions that conducts the conductive support shaft and the sliding contact portion,
The said arm part is radially extended so that it may become mutually equiangular toward the said conductive rotation base | substrate from the said conductive support shaft centering | focusing on the said conductive support shaft. Electrophotographic photoreceptor. The said conducting member is plate shape, The edge part which slidably contacts the internal peripheral surface of the said electroconductive rotation base | substrate is curving toward the axial direction of the said drum main body, The Claim 1 characterized by the above-mentioned. 5. The electrophotographic photosensitive member according to any one of 4 above. 5. The electrophotographic apparatus according to claim 1, wherein the conductive member includes a conductive brush, and the brush is in sliding contact with an inner peripheral surface of the conductive rotating base. Photoconductor. 5. The electron according to claim 1, wherein the conductive member includes a conductive fiber, and the conductive fiber is in sliding contact with an inner peripheral surface of the conductive rotating base. Photoconductor.

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