WO2011040380A1 - 帯電装置及び画像形成装置 - Google Patents
帯電装置及び画像形成装置 Download PDFInfo
- Publication number
- WO2011040380A1 WO2011040380A1 PCT/JP2010/066755 JP2010066755W WO2011040380A1 WO 2011040380 A1 WO2011040380 A1 WO 2011040380A1 JP 2010066755 W JP2010066755 W JP 2010066755W WO 2011040380 A1 WO2011040380 A1 WO 2011040380A1
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- Prior art keywords
- tip
- electrode
- charging device
- airflow
- case
- Prior art date
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
- G03G15/0291—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices corona discharge devices, e.g. wires, pointed electrodes, means for cleaning the corona discharge device
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
- G03G21/20—Humidity or temperature control also ozone evacuation; Internal apparatus environment control
- G03G21/206—Conducting air through the machine, e.g. for cooling, filtering, removing gases like ozone
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/01—Apparatus for electrophotographic processes for producing multicoloured copies
- G03G2215/0103—Plural electrographic recording members
- G03G2215/0119—Linear arrangement adjacent plural transfer points
- G03G2215/0122—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt
- G03G2215/0125—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being horizontal or slanted
- G03G2215/0132—Linear arrangement adjacent plural transfer points primary transfer to an intermediate transfer belt the linear arrangement being horizontal or slanted vertical medium transport path at the secondary transfer
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2215/00—Apparatus for electrophotographic processes
- G03G2215/02—Arrangements for laying down a uniform charge
- G03G2215/026—Arrangements for laying down a uniform charge by coronas
- G03G2215/028—Arrangements for laying down a uniform charge by coronas using pointed electrodes
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
- G03G2221/16—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts
- G03G2221/1645—Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements and complete machine concepts for conducting air through the machine, e.g. cooling
Definitions
- the present invention relates to a charging device including a non-contact type discharge electrode that charges a photosensitive member during electrophotographic image formation, and an image forming apparatus including the charging device.
- an apparatus that charges a photosensitive member by a charging device in which a non-contact type discharge electrode is fixed in a shield case having an opening.
- the charging device performs corona discharge (hereinafter simply referred to as discharge) on the photosensitive member from the tip of the discharge electrode to which a high voltage is applied, and charges the photosensitive member.
- An object of the present invention is to provide a charging device that can reliably prevent dust from adhering to the tip of a discharge electrode and can sufficiently improve the deterioration of image quality due to discharge unevenness, and an image forming apparatus equipped with the charging device. .
- the charging device includes a discharge electrode, a shielding case, an airflow generation unit, and a guide member, and discharges the photosensitive member to charge the photosensitive member.
- the discharge electrode has a serrated tip.
- the shielding case is arranged around the discharge electrode with a gap from the discharge electrode, the opening provided with the grid electrode opposite to the plurality of tip ends of the discharge electrode, and the side opposite to the tip end of the discharge electrode And a bottom surface provided with a first air inlet so as to face the end portion.
- the airflow generation unit generates an airflow that flows from the first air inlet and passes through the case.
- the guide member is provided in the case and guides the airflow generated by the airflow generation portion from the first intake port to the tip end portion of the discharge electrode in the case and passes through the periphery of the tip portion. Form.
- the charging device further includes an intake passage and an exhaust passage.
- the intake passage guides the airflow from the second intake port isolated from the photoconductor to the first intake port.
- the exhaust passage guides the airflow passing through the tip of the discharge electrode and discharged from the shielding case to an exhaust port isolated from the second intake port.
- the intake port is provided at a position isolated from the photoconductor and at a position isolated from the exhaust port, so clean air that does not contain dust floating around the photoconductor is removed from the case. Can be sent to the opening. Further, since the airflow that has passed through the tip of the discharge electrode is discharged from the exhaust port, it does not stay in the charging device, and an airflow that does not contain dust can always pass around the tip.
- the guide member has a surface inclined at an angle greater than an elevation angle with respect to the distal end portion of the discharge electrode.
- the flow path formed by the guide member is narrower than the first intake port. Since the flow path formed by the guide member is narrower than the first air inlet, the airflow flowing from the first air inlet is accelerated when passing through the flow path formed by the guide member. Therefore, since the airflow passes around the tip of the discharge electrode at a high speed, the tip of the discharge electrode can be protected by the airflow, and dust can be more reliably prevented from adhering.
- the image forming apparatus of the present invention includes the charging device having the above-described configuration and an image forming unit.
- the image forming unit forms a toner image on the photosensitive member charged by the charging device, and transfers the toner image to a sheet. As a result, dust does not adhere to the tip of the discharge electrode, so that discharge unevenness can be prevented and a clear image can be formed.
- the air current guided by the guide member is passed through the tip portion of the discharge electrode, and the tip portion is protected by this air flow. Therefore, it is possible to reliably prevent dust from adhering to the tip portion of the discharge electrode and The image quality degradation due to the can be sufficiently improved.
- FIG. 1 is a schematic front view of an image forming apparatus provided with a charging device according to an embodiment of the present invention.
- (A) is a schematic view of a unit including a charging device
- (B) is a front view of an intake port provided in the unit shown in (A)
- (C) is a schematic configuration of a charging device according to an embodiment of the present invention.
- FIG. (A) is an overview of the discharge electrode
- (B) is an enlarged view of the charging device
- (C) is an enlarged view of another form of the charging device. It is sectional drawing which shows the structure of a charging device.
- (A) is a configuration in which a guide plate and an air barrier are arranged opposite to the tip of the discharge electrode, and (B) is a gap between the surface of the guide plate holder where the bottom of the discharge electrode abuts and the upper surface of the electrode holder.
- (C) is a figure which shows the structure provided with the exhaust port between the left side surface of a case, and a grid electrode.
- (A) is the same height when the air barrier is installed with the same width as the opening
- (B) is the same height as the opening with the same width as the opening
- (C) is It is a figure which shows the state of the airflow in the case where the space
- the image forming apparatus 1 includes four image forming units 101A to 101D, an intermediate transfer belt 105, a secondary transfer roller 108, a belt cleaning unit 110, a sheet conveyance path 113, a tray 114, a fixing unit 115, A paper discharge roller 116, a paper discharge tray 117, and a control unit (not shown) are provided.
- the intermediate transfer belt 105 is an endless belt, is stretched around the support roller 106A and the support roller 106B, and rotates in the direction of arrow R.
- primary transfer rollers 35A to 35D are arranged in this order between the support roller 106B and the support roller 106A.
- image forming units 101A to 101D, a secondary transfer roller 108, and a belt cleaning unit 110 are arranged in this order.
- the secondary transfer roller 108 is disposed to face the support roller 106A with the intermediate transfer belt 105 interposed therebetween.
- the belt cleaning unit 110 is disposed to face the support roller 106B with the intermediate transfer belt 105 interposed therebetween.
- the four image forming units 101A to 101D are image forming units that form toner images of black, cyan, magenta, and yellow, respectively.
- the image forming units 101A to 101D have the same configuration, and the image forming unit 101A will be mainly described below.
- the image forming unit 101A includes a charging device 32A, an exposure device 33A, a developing device 34A, a transfer device (primary transfer roller) 35A, and a cleaner device 36A.
- the devices are arranged in this order around the photosensitive drum 31A. Yes.
- the photosensitive drum 31A is disposed to face the primary transfer roller 35A with the intermediate transfer belt 105 interposed therebetween.
- a tray 114 for storing paper is disposed below the image forming units 101A to 101D.
- a plurality of paper feed rollers 113A to 113D, a support roller 106A, a secondary transfer roller 108, a fixing unit 115, and a paper discharge roller 116 are arranged in this order on the paper transport path 113.
- the image forming apparatus 1 operates as follows.
- Each of the image forming units 101A to 101D forms an image according to an instruction from the control unit.
- the charging device 32A charges the photosensitive drum 31A
- the exposure device 33A forms an electrostatic latent image on the photosensitive drum 31A.
- the developing device 34A supplies toner to the photosensitive drum 31A to visualize the electrostatic latent image into a toner image.
- the primary transfer roller 35 ⁇ / b> A transfers the toner image on the photosensitive drum 31 ⁇ / b> A onto the intermediate transfer belt 105.
- the cleaner device 36A cleans the surface of the photosensitive drum 31A after the toner image is transferred.
- the single color toner images formed by the image forming units 101A to 101D are transferred so as to be superimposed on the intermediate transfer belt 105, thereby forming one color image.
- the paper stored in the tray 114 is fed out by the paper feed roller 113A, and conveyed by the paper feed rollers 113B to 113D in the direction of arrow P to the secondary transfer position where the secondary transfer roller 108 faces the intermediate transfer belt 105. Is done.
- the color image formed on the intermediate transfer belt 105 is transferred to the sheet by the support roller 106A and the secondary transfer roller 108 at the secondary transfer position.
- the surface of the intermediate transfer belt 105 after the color image is transferred is cleaned by the belt cleaning unit 110.
- the sheet on which the color image has been transferred is conveyed to the fixing unit 115.
- the fixing unit 115 fixes the color image on the paper.
- the paper discharge roller 116 discharges the paper on which the color image is fixed to the paper discharge tray 117.
- the charging device 32A of the image forming unit 101A has the same configuration as the charging devices 32B to 32D of the other image forming units 101B to 101D.
- the charging device 32A is provided, for example, in a unit 30A integrated with the photosensitive drum 31A and the cleaner device 36A.
- the housing 301A and the housing 302A provided at both ends of the unit 30A hold the rotating shaft 311A of the photosensitive drum 31A in a freely rotatable manner.
- the charging device 32A is provided at a position facing the photosensitive drum 31A indicated by a dotted line in FIG.
- the unit 30A includes an air inlet 42A (second air inlet) on the surface opposite to the photosensitive drum 31A in a direction orthogonal to the rotation axis of the photosensitive drum 31A.
- the casing 302A is provided with a cylindrical exhaust part 631 extending in a direction parallel to the rotation axis of the photosensitive drum 31A.
- An exhaust port 63 ⁇ / b> A is provided at the end of the exhaust unit 631.
- a cover 61A of the exhaust duct 62A is detachably attached to the outside of the unit 30A between the photosensitive drum 31A and the air inlet 42A.
- the air inlet 42A when the air inlet 42A is viewed from the direction of the arrow T (the direction of the bottom of the unit 30A), the air inlet 42A has a shape as shown in FIG. 2B, and a plurality of ribs are formed at predetermined intervals. 421A is provided.
- An airflow generator (airflow generator) 632A is attached to the exhaust part 631A.
- the airflow generation device 632A generates an airflow that flows from the intake port 42A through the shielding case of the charging device 32A to the exhaust port 63A.
- a fan is preferable.
- the airflow generation device 632A may be provided on the intake port 42A side.
- the charging device 32A includes a shielding case 52A, a sawtooth electrode 53A as an example of a discharge electrode, an electrode holder 54A, a guide plate holder 55A, a guide plate 56A, an air barrier 57A, and a grid.
- An electrode 58A is provided.
- the case 52A is formed of a conductive shield plate having a U-shaped cross section and surrounds the periphery of the sawtooth electrode 53A.
- the case 52A includes an opening 520A that faces the tip portion 531A of the sawtooth electrode 53A, a bottom surface 521A that faces the rear end portion 532A of the sawtooth electrode 53A, a left side surface 522A that faces both side surfaces of the sawtooth electrode 53A, and It has a right side 523A, and a front surface and a rear surface (not shown).
- the length of the case 52A in the width direction (the direction of the rotation axis of the photosensitive drum 31A) is substantially the same as the length of the entire intake port 42A in the longitudinal direction.
- the charging device 32A is arranged with the opening 520A facing the surface of the photosensitive drum 31A.
- a grid electrode 58A is provided in the opening 520A.
- An air inlet 524A (first air inlet) is provided at the center of the bottom surface 521A.
- the air inlet 524A is for taking in air from the outside of the case 52A.
- an electrode holder 54A having a width narrower than that of the air inlet 524A is installed at a predetermined interval from the air inlet 524A.
- the electrode holder 54A is L-shaped in cross section, and is installed perpendicular to the bottom surface 521A and the grid electrode 58A so that the tip of the sawtooth electrode 53A faces the grid electrode 58A.
- the tip portion 531A of the sawtooth electrode 53A is installed at a predetermined interval from the grid electrode 58A.
- the sawtooth electrode 53A is a thin plate made of metal (for example, stainless steel), and is attached to the electrode holder 54A with an adhesive or a screw (not shown).
- the sawtooth electrode 53A is processed and shaped into, for example, a sawtooth shape, and a plurality of sharp protrusions (discharge tips) 531A are provided at regular intervals (intermittently arranged). Have been).
- the guide plate holder 55A has an L-shaped cross section, is opposed to the electrode holder 54A so as to be able to ventilate at a predetermined interval, and is in contact with the bottom surface 521A.
- a guide plate 56A is attached to the guide plate holder 55A.
- the guide plate holder 55A holds the guide plate 56A inclined at a predetermined angle.
- the guide plate 56A corresponds to the guide member of the present invention, is inclined at a predetermined angle, and is attached to the sawtooth electrode 53A so as to be able to ventilate at a predetermined interval.
- the guide plate 56A guides the airflow flowing from the air inlet 524A to the periphery of the tip portion 531A of the sawtooth electrode 53A.
- the air barrier 57A (guide member) has an L-shaped cross section, has a side face facing the electrode holder 54A and the sawtooth electrode 53A, and is in contact with the bottom surface 521A of the case 52A so as to be able to ventilate at a predetermined interval. Yes.
- the upper surface 571A of the air barrier 57A is inclined at a predetermined angle.
- the air barrier 57A guides the airflow flowing from the air inlet 524A to the periphery of the tip portion 531A of the sawtooth electrode 53A.
- the grid electrode 58A is, for example, a metal mesh such as stainless steel that can be ventilated and connected to a power source (not shown).
- the sawtooth electrode 53A is connected to a high voltage power supply (not shown).
- a flow path 43A (intake flow path) for guiding an air flow taken from the outside of the unit 30 is provided.
- an exhaust duct 62A is provided between the cover 61A and the case 52A.
- the airflow sucked from the intake port 42A passes through the flow path 43A and flows into the charging device 32A from the intake port 524A.
- the airflow that has flowed into the charging device 32A is guided (guided) by the guide plate 56A and the air barrier 57A, passes through the tip portion 531A of the sawtooth electrode 53A, and flows out from the opening portion 520A.
- the airflow flowing out from the opening 520A flows through the exhaust duct 62A (corresponding to the exhaust passage of the present invention) in the direction of the arrow S shown in FIG. 2A, and is discharged from the exhaust port 63A of the exhaust unit 631. Is done.
- the air current passes around the tip portion 531A of the sawtooth electrode 53A. And dust such as toner particles are prevented from adhering to the tip portion 531A of the sawtooth electrode 53A. Details will be described later.
- the surface facing the photosensitive drum 31A of the unit 30A An air inlet 42A is provided on the opposite surface.
- the air inlet 42A is isolated from the photosensitive drum 31A, so that clean air containing no dust can be taken in from the air inlet 42A.
- the air inlet 42A can be configured to face the outside of the image forming unit 101A. Since dust such as silica and toner is not normally floating outside the image forming unit 101, clean air that does not contain dust is taken from the air inlet 42A and sent to the charging unit 51A through the flow path 43A. Can do.
- a duct may be further connected to the air inlet 42A so as to take in air that does not contain dust from the outside of the image forming apparatus 1.
- a duct is connected to the air inlet 42A so that air is sucked from the front surface side (front side in FIG. 1) of the image forming apparatus 1, and the airflow flows to the charging unit 51A via this duct.
- a filter it is preferable to attach a filter to the air inlet 42A so as to prevent dust from entering the flow path 43A.
- the air outlet 63A for discharging the air discharged from the charging device 32A to the outside of the image forming unit 101 is provided so as not to stay in the image forming unit 101.
- the air discharged from the charging device 32A passes through the exhaust duct 62A and is discharged from the exhaust port 63A.
- the exhaust port 63A is provided at a position isolated from the intake port 42A. Further, as described above, when a duct is connected to the air inlet 42A so as to suck air from the front surface side (front side in FIG. 1) of the image forming apparatus 1, the back surface of the image forming apparatus 1 which is the opposite surface is provided. An exhaust port 63A is provided. As a result, air containing dust such as silica discharged from the exhaust port is not sucked from the intake port 42A.
- a filter to the exhaust port 63A so as to prevent dust from being discharged from the exhaust duct 62A.
- a negative high voltage of about ⁇ 5 kV for example, is applied to the sawtooth electrode 53A from a high voltage power supply (not shown), the electric field concentrates on the tip of the sawtooth electrode 53A, and discharge starts from the tip 531A of the sawtooth electrode 53A.
- a gas such as oxygen is ionized, and negatively charged ions (charged particles) and ozone in which oxygen is dissociated and bonded are generated. Ions generated in the discharge region move along the electric field.
- ions are directed from the sawtooth electrode 53A toward the grid electrode 58A. Moving. Some of the ions flow to the grid electrode 58A, and the remaining ions pass through the grid electrode 58A and reach the photosensitive drum 31A, so that the surface of the photosensitive drum 31A is negatively charged. As ions move from the vicinity of the sawtooth electrode 53A toward the grid electrode 58A according to the electric field, an air flow (ion wind) is generated.
- the airflow generation device 632A is attached to the intake port 42A or the exhaust port 63A, a part of the ionic wind is caused by the airflow flowing from the intake port 42A to the exhaust port 63A. Is discharged outside. Further, ozone generated in the charging unit 51A can be forcibly discharged to the outside of the image forming unit 101.
- the elevation angle of the upper surface of the air barrier 57A is formed to be equal to or greater than the elevation angle with respect to the tip portion 531A of the sawtooth electrode 53A.
- the upper surface 571A of the air barrier 57A is inclined so that the shape of the upper surface of the air barrier 57A does not hit the tip 531A of the sawtooth electrode 53A.
- the elevation angle (inclination angle) ⁇ of the upper surface 571A is set to be equal to or greater than the elevation angle ⁇ with respect to the tip portion 531A of the sawtooth electrode 53A.
- the circulating airflow J flows along the upper surface 571A of the air barrier 57A, and the airflow N1 flowing into the case 52A via the air inlet 42A becomes the sawtooth electrode 53A. Passes through the tip 531A.
- the circulating airflow J1 does not hit the tip portion 531A of the sawtooth electrode 53A, and dust can be prevented from adhering to the tip portion 531A. Further, it is possible to prevent the circulating airflow J1 from being caught in the tip portion 531A of the sawtooth electrode 53A by the airflow flowing from the air inlet 42A.
- the guide plate 56A is inclined so that the circulating airflow J1 does not hit the tip portion 531A of the sawtooth electrode 53A.
- the elevation angle (inclination angle) ⁇ of the guide plate 56A is set to an elevation angle ⁇ or more with respect to the tip portion 531A of the sawtooth electrode 53A.
- an airflow that circulates between the left side 522A of the case 52A and the guide plate 56A is not normally generated.
- the circulating airflow flows along the guide plate 56A, so that the circulating airflow is prevented from hitting the tip portion 531A of the sawtooth electrode 53A. Can do.
- the airflow N2 flowing into the case 52A through the air inlet 42A passes through the periphery of the tip portion 531A of the sawtooth electrode 53A, the circulating airflow is further prevented from hitting the tip portion 531A of the sawtooth electrode 53A. Can do. Therefore, even if a circulating airflow is generated, it is possible to prevent dust from adhering to the tip portion 531A of the sawtooth electrode 53A.
- the speed of the airflows N1 and N2 is preferably set to about 1.0 m / s to 3.0 m / s, for example. This is because the tip 531A may not be protected by the airflows N1 and N2 if the airflow speed is too slow, and if the airflow speed is too fast, the charging of the photosensitive drum 31A may be adversely affected.
- the upper surface 57B of the air barrier 57A is perpendicular (0 degrees) to the sawtooth electrode 53A, and the upper surface of the air barrier 74A is lower than the tip portion 531A of the sawtooth electrode 53A. It is.
- a part of the ion wind J1 passes through the grid electrode 58A and moves rightward along the surface of the photosensitive drum 31A and the blade 361A. It flows into the case 52A and flows along the right side 523A and the upper surface of the air barrier 57A. That is, the ionic wind J1 becomes a circulating airflow J1.
- the circulating airflow J1 passes through the vicinity of the tip portion 531A (sawtooth portion) of the sawtooth electrode 53A after passing through the upper surface of the air barrier 57A.
- the momentum of the airflow flowing in from the intake port 524A to be stronger than that in the configuration shown in FIG. Wrapped in. Therefore, it is possible to prevent the circulating airflow J1 from hitting the tip of the sawtooth electrode 73A and to prevent dust from adhering to the tip 531A of the sawtooth electrode 53A.
- the tip 561A of the guide plate 56A and the upper surface 572A of the air barrier 57A are the same height as the tip 531A of the sawtooth electrode 53A.
- the front end of the guide plate 56A and the upper surface of the air barrier 57A may be higher than the front end portion 531A of the sawtooth electrode 53A.
- the tip portion of the sawtooth electrode 73A is wrapped with airflows N1 and N2 flowing from the air inlet 524A.
- the guide plate 56A and the air barrier 57A function as a protection plate for the circulating airflow J1 against the circulating airflow J1. Therefore, it is possible to reliably prevent the circulating airflow J1 from hitting the tip of the sawtooth electrode 73A, and to prevent dust from adhering to the tip 531A of the sawtooth electrode 53A.
- the charging portion 51A3 shown in FIG. 5B has a surface with which the bottom of the sawtooth electrode 53A of the guide plate holder 55A abuts so that air does not pass between the guide plate holder 55A and the electrode holder 54A.
- a plate 59A is attached between the upper surface of the electrode holder 54A.
- the end portion 522AT of the left side surface 522A of the case 52A is lower than the end portion 523AT of the right side surface 523A, and the left side surface 522A and the grid electrode 58A are connected.
- An exhaust port 526A is provided between them.
- the charging unit 71A1 includes a case 72A, a sawtooth electrode 73A, an air barrier 74A, an air barrier 75A, and a grid electrode 76A.
- the case 72A has a U-shaped cross section and includes a bottom surface 721A, a left side surface 722A, and a right side surface 723A.
- the left side surface 722A is lower than the right side surface 723A.
- An opening 724A is formed at the center of the bottom surface 721A.
- the opening 724A is for taking in air from the outside of the case 72A.
- a grid electrode 76A is provided in the opening 724A of the case 72A.
- the left side 722A is lower than the right side 723A, and the opening (discharge port) 726A is formed between the end 722AT of the left side 722A and the end 76AT1 of the grid electrode 76A.
- the sawtooth electrode 73A is supported by the front surface 727A and the back surface 728A of the case 72A without providing an electrode holder.
- the air barrier 74A and the air barrier 75A have a rectangular cross section, and their bottoms are in contact with the bottom surface 721A of the case 72A.
- the air barrier 74A and the air barrier 75A are installed with a certain distance (the same width as the opening 724A) from the sawtooth electrode 73A.
- the air barrier 74A and the air barrier 75A have the same height, and the sawtooth electrode 73A is higher than the air barrier 74A and the air barrier 75A. In other words, the tip of the sawtooth electrode 73A protrudes from between the air barrier 74A and the air barrier 75A.
- a charging unit 71A2 shown in FIG. 6B is obtained by changing the air barrier 75A in the charging unit 71A1 to the same height as the sawtooth electrode 73A. With this configuration, even if the circulating airflow J2 is generated in the charging unit 71A2, the circulating airflow J2 does not hit the tip portion 731A of the sawtooth electrode 73A, so that it is ensured that dust is attached to the tip portion 731A. Can be prevented.
- 6C has a trapezoidal cross section of the air barrier 74A and the air barrier 75A in the charging unit 71A1, and the flow paths of the airflows N3 and N4 flowing from the opening 724A to the tip 731A of the sawtooth electrode 73A. (Between the serrated electrode 73A and the air barriers 74A and 75A) is gradually narrowed. By comprising in this way, since the speed when airflow N3, N4 passes both sides of the front-end
- a sawtooth electrode has been described as an example of the discharge electrode.
- the present invention is not limited to this, and other shapes may be used as long as the discharge tip is intermittently arranged. These electrodes may be used.
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Abstract
Description
Claims (5)
- 鋸歯状の先端部を備えた放電電極と、
前記放電電極の周囲に前記放電電極と間隔を開けて配置され、前記放電電極の先端部に対向してグリッド電極が設けられた開口部と、前記放電電極の先端部と反対側の端部に対向して第1の吸気口が設けられた底面と、を備えたシールド用のケースと、
前記第1の吸気口から流入して前記ケース内を通過する気流を発生させる気流発生部と、
前記ケース内に設けられ、前記気流発生部が発生された気流を、前記第1の吸気口から前記ケース内の前記放電電極の先端部に導き、この先端部の周囲を通過させる流路を形成するガイド部材と、
を備え、
感光体に対して放電して、前記感光体を帯電させる帯電装置。 - 前記感光体から隔離された第2の吸気口から前記第1の吸気口へ気流を導く吸気流路と、
前記放電電極の先端部の周囲を通過して前記ケースの開口部から排出された気流を、前記第2の吸気口から隔離された排気口へ導く排気流路と、
を備えた請求項1に記載の帯電装置。 - 前記ガイド部材は、前記放電電極の先端部に対する仰角以上の角度で傾斜した面を有する請求項1に記載の帯電装置。
- 前記ガイド部材が形成する流路は、前記第1の吸気口よりも狭い請求項1に記載の帯電装置。
- 請求項1乃至4のいずれかに記載の帯電装置と、画像形成部と、を備え、
前記画像形成部は、前記帯電装置により帯電された感光体にトナー画像を形成し、このトナー画像を用紙に転写する画像形成装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/499,315 US8712290B2 (en) | 2009-10-01 | 2010-09-28 | Electrostatic charger and image forming apparatus |
CN201080043595.9A CN102549505B (zh) | 2009-10-01 | 2010-09-28 | 带电装置以及图像形成装置 |
BR112012007515-2A BR112012007515A2 (pt) | 2009-10-01 | 2010-09-28 | Carregador eletrostático e aparelho formador de imagem |
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JP2009-229919 | 2009-10-01 | ||
JP2009229919A JP4676550B2 (ja) | 2009-10-01 | 2009-10-01 | 帯電装置及び画像形成装置 |
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WO2011040380A1 true WO2011040380A1 (ja) | 2011-04-07 |
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PCT/JP2010/066755 WO2011040380A1 (ja) | 2009-10-01 | 2010-09-28 | 帯電装置及び画像形成装置 |
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US (1) | US8712290B2 (ja) |
JP (1) | JP4676550B2 (ja) |
CN (1) | CN102549505B (ja) |
BR (1) | BR112012007515A2 (ja) |
WO (1) | WO2011040380A1 (ja) |
Families Citing this family (2)
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JP2015128137A (ja) * | 2013-11-28 | 2015-07-09 | 株式会社リコー | 電子機器 |
JP6432821B2 (ja) * | 2014-07-07 | 2018-12-05 | 株式会社リコー | 画像形成装置 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10307441A (ja) * | 1997-05-09 | 1998-11-17 | Konica Corp | カラー画像形成装置 |
JPH11143179A (ja) * | 1997-11-14 | 1999-05-28 | Konica Corp | 画像形成装置 |
JP2008257183A (ja) * | 2007-03-13 | 2008-10-23 | Ricoh Co Ltd | 帯電ブラシ、帯電装置、プロセスユニット及び画像形成装置 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5110785B1 (ja) * | 1971-01-16 | 1976-04-06 | ||
JPS57189156A (en) * | 1981-05-19 | 1982-11-20 | Canon Inc | Corona charger |
JPS61213868A (ja) * | 1985-03-20 | 1986-09-22 | Canon Inc | 放電装置 |
JPH09230668A (ja) * | 1996-02-20 | 1997-09-05 | Konica Corp | コロナ帯電装置を有する画像形成装置 |
EP0778502A1 (en) * | 1995-12-07 | 1997-06-11 | Konica Corporation | Charging device |
JPH09197766A (ja) | 1996-01-24 | 1997-07-31 | Konica Corp | 放電電極装置 |
CN2684236Y (zh) * | 2002-05-27 | 2005-03-09 | 精工爱普生株式会社 | 图像形成装置 |
JP4512997B2 (ja) * | 2004-09-28 | 2010-07-28 | ブラザー工業株式会社 | 帯電器、プロセスカートリッジ及び画像形成装置 |
-
2009
- 2009-10-01 JP JP2009229919A patent/JP4676550B2/ja active Active
-
2010
- 2010-09-28 WO PCT/JP2010/066755 patent/WO2011040380A1/ja active Application Filing
- 2010-09-28 US US13/499,315 patent/US8712290B2/en active Active
- 2010-09-28 CN CN201080043595.9A patent/CN102549505B/zh not_active Expired - Fee Related
- 2010-09-28 BR BR112012007515-2A patent/BR112012007515A2/pt not_active IP Right Cessation
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10307441A (ja) * | 1997-05-09 | 1998-11-17 | Konica Corp | カラー画像形成装置 |
JPH11143179A (ja) * | 1997-11-14 | 1999-05-28 | Konica Corp | 画像形成装置 |
JP2008257183A (ja) * | 2007-03-13 | 2008-10-23 | Ricoh Co Ltd | 帯電ブラシ、帯電装置、プロセスユニット及び画像形成装置 |
Also Published As
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BR112012007515A2 (pt) | 2021-09-21 |
US8712290B2 (en) | 2014-04-29 |
CN102549505A (zh) | 2012-07-04 |
JP4676550B2 (ja) | 2011-04-27 |
JP2011076006A (ja) | 2011-04-14 |
US20120189348A1 (en) | 2012-07-26 |
CN102549505B (zh) | 2015-07-22 |
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