WO2015178505A1 - 現像装置、プロセスカートリッジ及び画像形成装置 - Google Patents
現像装置、プロセスカートリッジ及び画像形成装置 Download PDFInfo
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- WO2015178505A1 WO2015178505A1 PCT/JP2015/065488 JP2015065488W WO2015178505A1 WO 2015178505 A1 WO2015178505 A1 WO 2015178505A1 JP 2015065488 W JP2015065488 W JP 2015065488W WO 2015178505 A1 WO2015178505 A1 WO 2015178505A1
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- magnetic
- developer
- developer carrier
- developing
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- 230000008569 process Effects 0.000 title abstract description 20
- 238000011161 development Methods 0.000 claims abstract description 13
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Classifications
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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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0921—Details concerning the magnetic brush roller structure, e.g. magnet configuration
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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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
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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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
- G03G15/0813—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by means in the developing zone having an interaction with the image carrying member, e.g. distance holders
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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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
- G03G15/0818—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the structure of the donor member, e.g. surface properties
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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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush
- G03G15/0942—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush with means for preventing toner scattering from the magnetic brush, e.g. magnetic seals
-
- 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
- G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
- G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
- G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
- G03G15/0887—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity
- G03G15/0891—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity for conveying or circulating developer, e.g. augers
- G03G15/0893—Arrangements for conveying and conditioning developer in the developing unit, e.g. agitating, removing impurities or humidity for conveying or circulating developer, e.g. augers in a closed loop within the sump of the developing device
Definitions
- the present invention relates to a developing device, a process cartridge, and an image forming apparatus therefor that are used in an electrophotographic or electrostatic recording type image forming apparatus.
- a rotatable developing sleeve is often used as a developer carrier for carrying and transporting a developer. Further, seal members for suppressing the developer from flowing out of the developing container are provided at both axial end portions of the developing sleeve.
- a magnetic seal member which is a magnetic seal member, is disposed with a fixed gap from the outer peripheral surface of the developing sleeve, whereby the developer from the developing container There are ways to curb spills.
- the developer having magnetism may be a one-component developer (toner) or a two-component developer including a nonmagnetic toner and a magnetic carrier.
- the magnetic seal member is configured using a magnet.
- the magnetic seal member extends at both axial end portions of the developing sleeve so as to face a predetermined range in the circumferential direction of the developing sleeve with a fixed gap from the outer peripheral surface of the developing sleeve, and this state At the same time as the developing sleeve.
- the magnetic seal member fills the gap between the outer peripheral surface of the developing sleeve and the surface of the magnetic seal member by the magnetic brush formed by the magnetic brush of the developer formed along each magnetic force line, and the developer flows out of the developing container. Suppress.
- the magnetic seal member Since the magnetic seal member is not in contact with the developing sleeve, the rotational torque of the developing sleeve is extremely small, thus making it possible to make the drive motor compact and inexpensive. In addition, the fluctuation of the rotational torque of the developing sleeve is also reduced, and the uneven rotation of the developing sleeve and the photosensitive drum is less likely to occur. Therefore, it is possible to suppress the deterioration of the image quality due to the uneven rotation. Further, since the magnetic seal member does not deteriorate due to wear and the like, it can be used for a long time, and can contribute to prolonging the life of the developing device and can cope with recycling.
- Japanese Patent Application Laid-Open No. 10-39630 comprises a magnetic seal member comprising a magnet and a magnetic member, and suppresses the diffusion of magnetic lines of force for sealing the gap between the magnetic seal member and the developing sleeve in the axial direction of the developing sleeve. To improve the sealability of the magnetic seal member.
- the developer transportability of the developing sleeve is increased in order to suppress the retention of the developer in the take-in portion as described above, the developer restrained by the magnetic force of the magnetic seal member is the developing sleeve. It may deteriorate due to friction with it. As a result, for example, in the case of a two-component developer, a phenomenon in which toner components are released and the accumulated toner flows out of the developing container (here, this phenomenon may be referred to as "toner drop”) may occur. .
- an object of the present invention is to provide a developing device, a process cartridge, and a developing device capable of suppressing problems such as deterioration of the developer in the developer intake portion and deterioration due to rubbing of the developer with the developer carrier when using a magnetic sealing member.
- An image forming apparatus is provided.
- a developer container for containing a developer, a rotatable developer carrier for carrying the developer and transporting the developer to the image carrier, and the developer container being disposed inside the developer carrier.
- a magnetic field generating means for generating a magnetic field, a magnetic seal member disposed with a gap from the outer peripheral surface of the developer carrier at both end portions in the axial direction of the developer carrier, the developer There is a space for the outer peripheral surface of the developer carrier at the axially inner end of the carrier at the axially inner end of the developer carrier and a gap for the magnetic seal member.
- a first area including And a second region adjacent to the first region outside the region of the second region and having a lower developer carrying capacity than the first region, or having substantially no conveying capability.
- the boundary between the first region and the second region of the outer circumferential surface of the developer carrier at both axial ends of the developer carrier is the magnetic seal member in the axial direction of the developer carrier.
- the developing device is located between the magnetic member and the magnetic member.
- an electrophotographic photosensitive member there is provided an electrophotographic photosensitive member, and the above-mentioned developing device of the present invention for developing an electrostatic image formed on the electrophotographic photosensitive member.
- a removable process cartridge is provided.
- an image forming apparatus having an image carrier and the above-mentioned developing device of the present invention for developing an electrostatic image formed on the image carrier.
- the magnetic seal member when used, it is possible to suppress problems such as the retention of the developer in the developer intake portion and the deterioration due to the rubbing of the developer with the developer carrier.
- FIG. 1 is a schematic cross-sectional view of the image forming apparatus.
- FIG. 2 is a cross-sectional view of the developing device in the lateral direction.
- FIG. 3 is a longitudinal sectional view of the developing device.
- FIG. 4 is a schematic view of an end seal configuration of the developing sleeve.
- FIG. 5 is a schematic view of a magnet seal and a magnetic plate.
- FIG. 6 is a graph illustrating the magnetic flux density distribution of the magnet roller and the arrangement of the magnetic plate and the magnet seal in the circumferential direction of the developing sleeve.
- FIG. 7 is a schematic view showing magnetic lines of force between the magnetic plate, the magnet seal and the magnet roller in one embodiment.
- FIG. 8 is a schematic view showing magnetic lines of force between the magnetic plate, the magnet seal, and the magnet roller in the comparative example.
- FIG. 1 is a schematic cross-sectional view of an image forming apparatus 100 of the present embodiment.
- the image forming apparatus 100 of the present embodiment is a tandem type laser beam printer adopting an intermediate transfer method capable of forming a full color image using an electrophotographic method.
- the image forming apparatus 100 includes first, second, third, and fourth image forming units UY, UM, UC, and UK as a plurality of image forming units (stations).
- the image forming units UY, UM, UC, and UK form images of yellow (Y), magenta (M), cyan (C), and black (K), respectively.
- Y, M, C, and K at the end of the reference numerals indicating that they are elements provided for any color are omitted, and the elements are generally described. Do.
- the image forming unit U includes a photosensitive drum 101 which is a drum (cylindrical) electrophotographic photosensitive member (photosensitive member) as an image bearing member.
- the photosensitive drum 101 is rotationally driven in the direction of arrow R1 in the drawing.
- the surface of the rotating photosensitive drum 101 is uniformly charged by a charging device 102 as charging means.
- the charging device 102 is a corona charging type that is noncontact charging.
- the charged surface of the photosensitive drum 101 is exposed by an exposure device (laser scanner device) 103 as an exposure unit.
- the exposure device 103 is driven by a laser driver (not shown) according to the image information of the component corresponding to each image forming unit U.
- electrostatic latent images (electrostatic images) of the components corresponding to the respective image forming portions U are formed on the photosensitive drum 101.
- the electrostatic latent image formed on the photosensitive drum 101 is developed (visualized) as a toner image by a developing device 104 as a developing unit.
- the developing device 104 supplies toner charged to the same polarity as the charging polarity of the photosensitive drum 101 to the exposed portion where the absolute value of the potential is lowered by exposure after being uniformly charged.
- the developing device 104 will be described in more detail later.
- An intermediate transfer device 120 is disposed below the image forming units U in the drawing.
- the intermediate transfer device 120 has an intermediate transfer belt 121 composed of an endless belt as an intermediate transfer member.
- the intermediate transfer belt 121 is stretched around a tension roller 122 as a plurality of stretching rollers (support members), a driving roller 123, and a secondary transfer opposing roller 124.
- the intermediate transfer belt 121 travels (rotates) in the direction of the arrow R2 in FIG.
- a primary transfer blade 105 as a primary transfer unit is disposed at a position facing the photosensitive drums 101 of the image forming units U on the inner peripheral surface (rear surface) side of the intermediate transfer belt 121.
- the primary transfer blade 105 is urged (pressed) toward the photosensitive drum 101 via the intermediate transfer belt 121 to form a primary transfer portion (primary transfer nip) T1 at which the intermediate transfer belt 121 and the photosensitive drum 101 contact with each other.
- a secondary transfer roller 125 as a secondary transfer unit is disposed at a position facing the secondary transfer facing roller 124 on the outer peripheral surface (front surface) side of the intermediate transfer belt.
- the secondary transfer roller 125 is biased (pressed) toward the secondary transfer opposing roller 124 via the intermediate transfer belt 121, and the secondary transfer portion (secondary transfer portion) in contact with the secondary transfer roller 125
- the next transfer nip) T2 is formed.
- a belt cleaner 114 as an intermediate transfer member cleaning unit is disposed at a position facing the driving roller 123.
- toner images of yellow, magenta, cyan, and black are formed on the photosensitive drums 101 of the image forming units U, respectively.
- the toner images are transferred (primary transfer) sequentially superimposed on the intermediate transfer belt 121 in the respective primary transfer portions T1 by the action of the respective primary transfer blades 105.
- a primary transfer bias opposite in polarity to the charge polarity of the toner at the time of development is applied to the primary transfer blade 105.
- the toner image transferred onto the intermediate transfer belt 121 is transferred (secondary transfer) to a recording material (recording medium, transfer material) P such as recording paper at the secondary transfer portion T2 by the action of the secondary transfer roller 125. Be done. At this time, to the secondary transfer roller 125, a secondary transfer bias having a reverse polarity to the charging polarity of the toner at the time of development is applied.
- the recording material P to which the toner image has been transferred is conveyed to a fixing device 130 provided with fixing rollers 131 and 132, and is pressed and heated by the fixing device 130, and the toner image is fixed thereon. Thereafter, the recording material P is discharged (outputted) to the outside of the apparatus main body 150 of the image forming apparatus 100.
- toner (primary transfer residual toner) remaining on the photosensitive drum 101 after the primary transfer is removed from the photosensitive drum 101 by the drum cleaner 109 as a photosensitive member cleaning unit and collected.
- toner (secondary transfer residual toner) remaining on the intermediate transfer belt 121 after the secondary transfer is removed from the intermediate transfer belt 121 by the belt cleaner 114 and collected.
- each image forming unit U the photosensitive drum 101 and the charging device 102 as a process means acting on the photosensitive drum 101, the developing device 104, and the drum cleaner 109 are integrally formed into a cartridge to be a process cartridge. 110 are configured.
- the process cartridge 110 is attachable to and detachable from the apparatus main body 150 of the image forming apparatus 100.
- the process cartridge is an electrophotographic image forming apparatus, in which a photosensitive member and at least one of a charging unit, a developing unit, and a cleaning unit as process units acting on the photosensitive unit are integrally formed into a cartridge. It is made removable with respect to the main body.
- the process cartridge has at least a developing device as developing means.
- the electrophotographic image forming apparatus forms an image on a recording medium using an electrophotographic image forming process. Examples of the electrophotographic image forming apparatus include an electrophotographic copying machine, an electrophotographic printer (laser beam printer, LED printer, etc.), a facsimile machine, and a word processor.
- the developing device is mounted on the main body of the image forming apparatus in a state where a part of the process cartridge is configured or the developing device is independent.
- the developing device may be a cartridge (developing cartridge) which can be detached from the main body of the image forming apparatus alone.
- the apparatus main body of the image forming apparatus is an image forming apparatus portion excluding the process cartridge and the developing cartridge.
- a drum-shaped photosensitive member is used as the image bearing member, but it is also possible to use a belt-shaped photosensitive member.
- the charging method, the transfer method, the cleaning method, and the fixing method are not limited to the above. 2. Development device ⁇ Overview of development device>
- the configuration and operation of the developing device 104 in each image forming unit U are substantially the same except that the color of the toner used is different.
- a direction substantially parallel to the axial direction of the developer carrier to be described later may be referred to as a longitudinal direction
- a direction orthogonal to the longitudinal direction may be referred to as a lateral direction.
- FIG. 2 is a cross-sectional view of the developing device 104 in the lateral direction.
- FIG. 3 is a cross-sectional view taken along the line B-B in FIG. 2 (a part of the elements arranged on the front side of the cross-section is also indicated by a broken line).
- the developing device 104 is a device that visualizes the electrostatic latent image formed on the image carrier with toner.
- the developing device 104 has a developing container 1 for containing a developer. Further, the developing device 104 has a developing sleeve 2 as a rotatable developer carrier that carries the developer and transports the developer to the image carrier.
- the developing device 104 has a magnet roller 3 as a magnetic field generating unit which is disposed inside the developing sleeve 2 and generates a magnetic field for carrying the developer on the developing sleeve 2.
- the developing device 104 also has a magnet seal 4 as a magnetic seal member (magnet member) which is disposed with a gap from the outer peripheral surface of the developing sleeve 2 at both end portions in the axial direction of the developing sleeve 2.
- the developing device 104 includes magnetic plates 5 as magnetic members disposed on both axial ends of the developing sleeve 2 inward of the magnetic seal member 4 in the axial direction of the developing sleeve 2.
- Each magnetic plate 5 has a gap to the outer peripheral surface of the developing sleeve 2 and a gap to the magnet seal 4.
- the developing device 104 has a control blade 6 as a developer control member for controlling the developer conveyed by the developing sleeve 2.
- the developing device 104 also has first and second conveying screws 7 a and 7 b as developer conveying members that convey the developer in the developing container 1 while stirring and circulate the developer in the developing container 1.
- a two-component developer T containing a nonmagnetic toner t and a magnetic carrier c was used as the developer.
- the developing sleeve 2 includes the magnet roller 5 in the hollow portion thereof.
- the developing sleeve 2 is rotationally driven in the direction of the arrow R3 in the drawing (the direction in which the moving direction of the photosensitive drum 101 and the developing sleeve 2 becomes the forward direction at the portion facing the photosensitive drum 101).
- the developing sleeve 2 carries the developer (two-component developer in which the toner t adheres to the surface of the carrier c) T by the magnetic force of the magnet roller 3 and rotates to convey the developer in the rotational direction R3.
- a developer is supplied to the electrostatic latent image formed on the photosensitive drum 101.
- the first and second conveying screws 7a and 7b are configured to have a helical screw blade on the rotation shaft.
- the rotation shafts of the first and second transport screws 7a and 7b are rotationally driven to transport the developer in the axial direction.
- the developing container 1 has an opening 13 at a position corresponding to a developing portion (developing position) A facing the photosensitive drum 101.
- the developing sleeve 2 is rotatably supported by the developing container 1 so that a part of the developing sleeve 2 is exposed to the photosensitive drum 101 at the opening 13.
- the magnet roller 3 contained in the hollow portion of the developing sleeve 2 is fixed to the developing container 1 so as not to be rotatable.
- the flow of the developer on the cross section of the developing device 104 in the lateral direction will be described.
- the developer jumps up and is supplied to the developing sleeve 2.
- the developer is constrained by the magnetic force generated by the magnet roller 3 in the developing sleeve 2 because the magnetic carrier is mixed.
- the developing sleeve 2 rotates, the developer on the developing sleeve 2 passes through the facing portion (regulating area) of the developing sleeve 2 and the regulating blade 5 and is regulated to an appropriate amount (30 mg / cm in this embodiment) 2 ).
- the developer regulated to an appropriate amount is conveyed to the developing portion A facing the photosensitive drum 101 as the developing sleeve 2 rotates.
- the toner from the developer conveyed to the developing unit A is supplied to the electrostatic latent image on the photosensitive drum 101.
- the developer having passed through the developing unit A is taken into the inside of the developing container 1 in the taking-in unit 14 and collected by the second conveying screw 7 b.
- a partition 15 extending in the direction perpendicular to the paper surface of FIG. 2 is provided substantially at the center in the vertical direction.
- the inside of the developing container 1 is divided into a developing chamber 11 at the upper side in the vertical direction and a stirring chamber 12 at the lower side in the vertical direction.
- the developer is contained in the developing chamber 11 and the stirring chamber 12.
- First and second transport screws 7a and 7b are disposed in the developing chamber 11 and the stirring chamber 12, respectively.
- the first conveying screw 7 a is disposed at the bottom of the developing chamber 11 along the axial direction of the developing sleeve 2.
- the first transport screw 7 a rotates and feeds the developer in the developing chamber 11 along the axial direction (from the right side to the left side in FIG. 3) while supplying the developer to the developing sleeve 2.
- the second conveying screw 7 b is disposed at the bottom of the stirring chamber 12 along the axial direction of the developing sleeve 2.
- the second conveying screw 12 conveys the developer in the stirring chamber 12 in the axial direction opposite to the first conveying screw 7b (from the left side to the right side in FIG. 3).
- the developing chamber 11 and the agitating chamber 12 communicate with each other by the first connecting portion 16 and the second connecting portion 17 at both ends of the partition 15 in the longitudinal direction of the developing device 104.
- the developer which is not supplied from the developing chamber 11 to the developing sleeve 2 and passes through the developing chamber 11 is dropped from the developing chamber 11 to the stirring chamber 12 through the second connecting portion 17. Further, the developer collected from the developing sleeve 2 in the stirring chamber 12 and the developer dropped from the developing chamber 11 are assembled from the stirring chamber 12 to the developing chamber 11 through the first connecting portion 16.
- the developer is transported by rotation of the first and second transport screws 7a and 7b, and the developing chamber 11 and the stirring chamber 12 are communicated through the first and second connecting portions 16 and 17 which are the communicating portions at both ends of the partition 15. Is circulated between In addition, the toner corresponding to the amount consumed by development is appropriately replenished from the hopper 140 to the stirring chamber 12.
- An area in which an electrostatic latent image can be formed in the axial direction of the photosensitive drum 1 is an image forming area. Further, a region corresponding to the image forming region on the photosensitive drum 101 in the axial direction of the developing sleeve 2 is a developing region X. That is, the development area X is an area on the developer carrier corresponding to the image forming area on the image carrier carrying the electrostatic image developed by the developer conveyed by the developing sleeve 2.
- the developing sleeve 2 is made of aluminum which is a nonmagnetic material.
- the outer diameter of the developing sleeve 2 is ⁇ 20 mm.
- a grooved sleeve having a surface shape in which a plurality of concave portions formed for securing stable developer transportability are distributed is adopted as the developing sleeve 2.
- the grooved sleeve is formed by forming a groove having at least a component along the axial direction and arranged in parallel at a predetermined interval on the outer peripheral surface of the developing sleeve.
- a plurality of grooves 2 c (FIG. 4) extending substantially in parallel with the axial direction of the developing sleeve 2 are formed at predetermined intervals in the circumferential direction of the developing sleeve 2.
- the grooved sleeve is superior in durability because it is less likely to cause a decrease in the developer transport force over time as compared to a blast sleeve whose surface is blasted.
- the groove sleeve depending on the mode of use, unevenness in image density (banding) due to the period of the groove tends to occur. Therefore, in this embodiment, with respect to the outer diameter ⁇ 20 mm of the developing sleeve 2, the groove shape is V groove (groove having a V-shaped cross section perpendicular to the axial direction), the groove depth is 80 ⁇ m, and the number of grooves is As 80 pieces, they were equally spaced in the circumferential direction of the developing sleeve 2.
- the peripheral speed ratio of the developing sleeve 2 to the photosensitive drum 101 is set to 200% (the peripheral speed of the developing sleeve 2 is made faster than the peripheral speed of the photosensitive drum 101).
- the pitch corresponding to the groove of the developing sleeve 2 on the image is set to 0.5 mm or less, and even if it occurs, it is brought to a banding area which is difficult to distinguish visually.
- the adoption of the grooved sleeve makes it possible to obtain stable developer transportability.
- the developing sleeve 2 includes the developing area X and the high conveyance area 2a in which the groove 2c is formed on the outer peripheral surface, and the developer at the both ends outside the developing area X rather than the high conveyance area 2a.
- a low transfer area 2b having a reduced transfer capacity.
- the outer diameter of the developing sleeve 2 is reduced by 100 ⁇ m to reduce the outer diameter, and the low carrying area 2b without the groove 2c is formed on the surface, thereby lowering the carrying capacity of the developer.
- the outer peripheral surface of the developing sleeve 2 has the first area (high conveyance area) 2 a including the developing area X on the developing sleeve 2.
- the outer peripheral surface of the developing sleeve 2 is adjacent to the first area 2a outside the first area 2a at both axial ends of the developing sleeve 2 and has a developer transportability more than the first area 2a.
- a second area (low transfer area) 2b having a low or substantially no transfer capacity is provided.
- the first area 2a has a groove 2c along the axial direction of the developing sleeve 2, and the second area 2b does not have the groove 2c.
- the second area 2b does not have the groove 2c, it has a groove along the axial direction of the developing sleeve 2 which is shallower than the groove 2c of the first area 2a. This also makes it possible to lower the developer transportability than in the first region 2a.
- the groove 2 c extends substantially in parallel with the axial direction of the developing sleeve 2, and it is sufficient that the groove 2 c extends along the axial direction of the developing sleeve 2. It may have an angle (typically less than 45 degrees).
- a grooved sleeve is employed as the developing sleeve 2, but the present invention is also applicable to developing sleeves of other surface forms such as a blast sleeve. ⁇ Magnet roller>
- the magnet roller 3 will be described.
- the positions of the magnetic poles that the magnet roller 3 has in the circumferential direction are represented by the positions of the peak magnetic flux density of the magnetic flux density distribution of the magnetic field formed by each magnetic pole in the circumferential direction of the magnet roller 3.
- the magnetic flux density of the magnetic field formed by the magnet roller 3 is the magnetic flux density in the normal direction on the outer peripheral surface of the magnet roller 3.
- the circumferential position on the developing sleeve 2 corresponding to the magnetic pole of the magnet roller 3 may also be described as the position of the magnetic pole of the magnet roller 3 for convenience.
- a magnet roller 3 as a roller-like magnetic field generating means contained in the hollow portion of the developing sleeve 2 is fixed to the developing container 1.
- the magnet roller 3 has a plurality of magnetic poles fixedly arranged along the circumferential direction of the developing sleeve 2.
- the magnet roller 3 has a developing magnetic pole S1 at a position facing the developing portion A.
- the developer forms a magnetic brush on the developing sleeve 2 by the magnetic field that the S1 pole forms in the developing portion A.
- the magnetic brush transfers the charged toner to the electrostatic latent image on the photosensitive drum 101 by electrostatic force while contacting the photosensitive drum 101 rotating in the direction of the arrow R1 in the drawing at the developing portion A.
- the magnet roller 3 has a total of five poles of N1 pole, N2 pole, S2 pole, and S3 pole in addition to the above-mentioned S1 pole.
- each magnetic pole of the magnet roller 3 and the flow of the developer on the cross section in the lateral direction of the developing device 104 will be described.
- the developer jumps up and is supplied to the developing sleeve 2.
- the developer passes through the position of the S2 pole opposed to the regulating blade 6 and regulated to an appropriate amount (30 mg / cm 2 in the present embodiment).
- the developer regulated to an appropriate amount passes the position of the N1 pole, and is supplied to the position of the S1 pole facing the photosensitive drum 101.
- the developer which has consumed the toner for the electrostatic latent image by passing through the developing portion A passes the position of the N2 pole, is conveyed to the position of the S3 pole, and is taken into the inside of the developing container 1.
- a portion where the developer having passed through the developing portion A is taken into the developing container 1 is a taking-in portion 14 of the developing container 1.
- the developer is peeled off from the surface of the developing sleeve 2 by repulsive magnetic fields generated between the S3 pole and the S2 pole which are adjacent to each other and having the same polarity as each other, and collected by the second conveying screw 3b.
- FIG. 4 is a schematic view of an end seal configuration of the developing sleeve 2 in the present embodiment. Although FIG. 4 shows only one end of the developing sleeve 2 in the axial direction, the other end is also similar (symmetrical to the axial center of the developing sleeve 2).
- the developing sleeve 2 is rotatably supported by the developing container 1 via bearings 8 disposed at both axial ends.
- a magnet seal 4 is disposed inside the bearing 8 in the axial direction of the developing sleeve 2.
- the magnetic plate 5 is disposed inside the magnet seal 4 in the axial direction of the developing sleeve 2.
- the magnet seal 4 and the magnetic plate 5 are disposed close to each other in a non-contact manner along the axial direction of the developing sleeve 2.
- a line of magnetic force extends between the magnet roller 3 inside the developing sleeve 2 and at least one of the magnet seal 4 and the magnetic plate 5 to form a magnetic brush of the developer.
- the magnetic brush is formed in a space between the developing sleeve 2 and the magnetic brush so that the function as an end seal is exhibited. This functions to shut off the developer transferred from the developing container 1 along the surface of the developing sleeve 2 by the reciprocal circulation in the developing container 1.
- the toner scattering from the two-component developer circulating inside the developing container 1 acts to block the flow out of the developing container 1.
- the magnet seal 4 and the magnetic plate 5 are separated from each other by a predetermined gap from the outer peripheral surface of the developing sleeve 2 at the axial direction end of the developing sleeve 2 respectively. It extends in an arc shape so as to face a predetermined range in the circumferential direction of the.
- the magnet seal 4 and the magnetic plate 5 are attached to the developing container 1 in this state, respectively.
- the magnet seal 4 has a predetermined width (length in the longitudinal direction of the developing device), a predetermined thickness (developing device) in which the magnet as a component thereof is provided with a nylon binder containing magnetic powder of Nd-Fe-B A magnetic resin member produced by injection molding, having a length in the short direction of
- the magnetic plate 5 is an iron sheet metal having a predetermined thickness (length in the longitudinal direction of the developing device 104) and a predetermined width (length in the lateral direction of the developing device 104).
- the magnet seal 4 may be magnetized in a magnetic pole pattern as shown in, for example, FIGS. 5 (b) to 5 (d). In the case of FIG.
- the surface facing the developing sleeve 2 and the surface opposite to the developing sleeve 2 are magnetized to different polarities.
- the different polarity is magnetized alternately along the circumferential direction of the developing sleeve 2.
- FIG. 5D in the axial direction of the developing sleeve 2, one surface and the other surface are magnetized in different polarities.
- the magnet seal 4 one magnetized as shown in FIG. 5 (b) was used (see Example 2 in detail).
- the magnet seal 4 one having a magnetic flux density of 600 G (Gauss) was used. This magnetic flux density is taken as the peak magnetic flux density in the magnetic flux density in the normal direction on the surface of the magnet seal 4 on the developing sleeve 2 side.
- the distance d2 between the surface facing the sleeve 2 and the outer surface of the developing sleeve 2 is decreased, the above-mentioned sealing function tends to be enhanced.
- the distances d1 and d2 are too small, the developer pressure is increased, and the developer is deteriorated due to the rubbing with the developing sleeve 2, and the toner is fused on the surface of the developing sleeve 2, Aggregates of toner may be generated.
- the distances d1 and d2 are set to 1.0 mm respectively by comparing and examining the above-mentioned factors.
- the distance d3 between the magnet seal 4 and the magnetic plate 5 in the axial direction of the developing sleeve 2 is decreased, the above-mentioned sealing function tends to be enhanced. However, if the distance d3 is too close, the magnetic binding force at this position is too strong, and the developer continues to stay. Then, the toner may be fused on the surface of the developing sleeve 2 or the developer may be deteriorated due to the rubbing with the developing sleeve 2 to generate toner clumps. On the other hand, if the distance d3 is too large, the magnetic sealability is lost. Therefore, in the present embodiment, the distance d3 is set to 1.5 mm by comparing and examining the above factors. As in the present embodiment, this distance d3 is typically set larger than the above-described distances d1 and d2.
- the boundary 2 d between the first area (high conveyance area) 2 a and the second area (low conveyance area) 2 b of the outer peripheral surface of the development sleeve 2 at both axial ends of the development sleeve b 2 is It is located between the magnet seal 4 and the magnetic plate 5 in the axial direction.
- the distance between the inside and the inside of the magnetic plate 5 at both ends in the axial direction of the developing sleeve 2 (“the distance between the magnetic plates (inside-inside)”) is D. Further, the distance between the outer side and the outer side of the magnetic plate 5 at both end portions in the axial direction of the developing sleeve 2 (“the distance between the magnetic plate (outer-outer)”) is E. Further, the length of the high conveyance area 2 a in the axial direction of the developing sleeve 2 (“high conveyance area length”) is represented by F.
- the distance between the inside and the inside of the magnet seal 4 at both end portions in the axial direction of the developing sleeve 2 (“the distance between the seals (inner and inner)”) is G. Further, the length of the magnet roller 3 in the axial direction of the developing sleeve 2 (“magnet roller length”) is H. Further, a distance between the outer side and the outer side of the magnet seal 4 at both end portions in the axial direction of the developing sleeve 2 (“distance between seals (outer-outer)”) is I. Since each of these length regions is arranged based on the axial center of the respective developing sleeve 2, the shorter length regions are disposed more inside.
- the developer stagnates between the magnetic plate 5 and the magnet seal 4 at the loading portion 14. There are times when As a result, the developer may not be taken into the inside of the developing container 1 and may cause the "developing agent drop" as described above. This is because the developer transportability of the developing sleeve 2 at this portion is too low.
- the high conveyance area 2 a of the developing sleeve 2 is expanded to the point where it overlaps with the magnet seal 4 in the axial direction of the developing sleeve 2, the following occurs.
- the developer magnetically restrained by the magnet seal 4 may be deteriorated due to the rubbing with the developing sleeve 2.
- the toner in the two-component developer may be released to cause the above-mentioned "toner drop". This is because the developer transportability of the developing sleeve 2 at this portion is too high.
- the developing sleeve 2 has a relatively large developer conveying force between the magnet seal 4 and the magnetic plate 5, the developer is unlikely to stay. Further, in the area overlapping with the magnet seal 4, the developer conveying force of the developing sleeve 2 is small, so the deterioration of the developer hardly occurs.
- the magnet roller length H is made longer than the high conveyance area length F in order to bring the conveyance force to the entire high conveyance area 2 a of the developing sleeve 2. That is, in the present embodiment, both end portions of the plurality of magnetic poles of the magnet roller 3 in the axial direction of the developing sleeve 2 are the first region 2 a and the second region 2 a of the outer peripheral surface of the developing sleeve 2 in the axial direction of the developing sleeve 2. It is located outside the boundary 2d with the region 2b. In order to suppress attraction of the developer by the magnetic restraint force by the magnet roller 3 to the outside of the end seal portion by the magnet seal 4 and the magnetic plate 5, the magnet roller length H is a seal (outside-outside) It is shorter than the distance I.
- the length of each area is set as follows with respect to the length 326 mm of the development area X in the axial direction of the developing sleeve 2.
- Magnetic plate (inner-inner) distance D 326.2 mm ⁇ 0.2 mm
- Magnetic plate (outside-outside) distance E 327.2 mm ⁇ 0.2 mm
- High transfer area length F 329 ⁇ 0.4 mm
- Magnet seal (inner-inner) distance G 330.2 ⁇ 0.2 mm
- H 330.6 ⁇ 6 mm
- the magnetic seal member when used, problems such as retention of the developer in the developer intake portion and deterioration due to rubbing of the developer with the developer carrier can be suppressed by using the above-described configuration. it can. Therefore, according to this embodiment, it is possible to exhibit good sealability at the end portion of the developing sleeve 2 without causing adverse effects such as developer drop-off and toner drop-off.
- the magnetic flux density and polarity of the repulsive magnetic poles S2 and S3 of the magnet roller 3 and the magnetic flux density and polarity of the magnet seal 4 with respect to the pole arrangement position Define the surrounding circumferential position in more detail.
- the magnetic plate 5 in the circumferential direction surrounding the developing sleeve 2 with respect to the magnetic flux density, polarity and pole arrangement position of the repulsive magnetic poles S2 and S3 of the magnet roller 3 Define the position in more detail.
- FIG. 6 shows the magnetic flux density distribution in the circumferential direction of the magnet roller 3.
- the 0 ° position is plotted clockwise in FIG. 2 as the horizontal position of the developing sleeve 2 on the photosensitive drum 101 side.
- the positions of the magnetic plates 5 in the circumferential direction of the developing sleeve 2 are shown between the positions of the vertical solid lines in FIG. Further, between the vertical broken lines in FIG. 6, the arrangement position of the magnet seal 4 in the circumferential direction of the developing sleeve 2 is shown.
- the magnet seal 4 extends in a range including at least the repulsive magnetic field area formed by the S2 pole and the S3 pole of the magnet roller 3 in the circumferential direction of the developing sleeve 2.
- the repulsive magnetic field region is a region having a magnetic flux density lower than that of the repulsive magnetic poles S2 and S3 formed between the repulsive magnetic poles S2 and S3 in FIG.
- the magnetic plate 5 extends at least in the range including the magnet reel 4 at the circumferential position of the developing sleeve 2.
- the magnet seal 4 is disposed so as to surround the developing sleeve 2 in the circumferential direction from the position of 110 ° to the position of 252 °.
- the magnetic plate 5 is disposed so as to surround the developing sleeve 2 in the circumferential direction from the position of 106 ° to the position of 254 °.
- the magnet seal 4 and the magnetic plate 5 do not extend outside the position where the magnetic flux density is reduced to the same extent as the repulsive magnetic field region outside the S2 pole and the S3 pole.
- the magnetic plate 5 extends in a range including the magnetic seal 4 in the circumferential direction of the developing sleeve 2. Is preferred.
- the magnet seal 4 is disposed to the outside of the magnetic plate 5 in the circumferential direction of the developing sleeve 2, the magnetic restriction on the magnetic plate 5 is not performed at the position where the magnet seal 4 protrudes from the magnetic plate 5. Therefore, at that position, the developer on the developing sleeve 2 is drawn to the position of the magnet seal 4 on the outside in the axial direction of the developing sleeve 2 to a large extent. A large amount of developer attracted to the magnet seal 4 tends to stay in the gap between the developing sleeve 2 and the magnet seal 4. As a result, "developing agent drop" may be generated by the mechanism described above.
- the magnet seal 4 is preferably contained inside the magnetic plate 5 in the circumferential direction of the developing sleeve 2 for the above reason, if the circumferential length of the magnet seal 4 is too short, then the magnetic plate 4 will It is not preferable that the magnetic regulation at 5 is weakened.
- the tip portion of the magnetic plate 5 is magnetized by the magnetic field generated from the magnet roller 3 and is magnetized by the magnetic field of the adjacent magnet seal 4 so that good magnetic sealability at this position can be secured. Therefore, as for the length of the circumferential direction of the magnet seal 4 and the magnetic board 5, it is desirable to closely approach to such an extent that it does not protrude by design tolerance.
- the magnetically seal at the position of the magnetic plate 5 in the axial direction of the developing sleeve 2. From this point of view, it is desirable to concentrate the magnetic field on the tip of the magnetic plate 5 for magnetization. For this purpose, for example, it is conceivable to increase the magnetic flux density of the S3 pole of the magnet roller 3 to strengthen the magnetization with the magnetic plate 5. However, in this method, the magnetic constraint between the S3 pole and the magnet seal 4 is simultaneously strengthened, so that the developer may be attracted to the magnet seal 4.
- a magnetic pole of the same polarity as the repulsive pole magnets S2 and S3 of the magnet roller 3 is disposed on the surface of the magnet seal 4 facing the developing sleeve 2 (FIG. 5 (b)). Further, the magnetic flux density of the surface of the magnet seal 4 facing the developing sleeve 2 is made larger than the magnetic flux density of each of the repulsive magnetic poles S2 and S3. Further, the distance between the magnet seal 4 and the magnetic plate 5 in the axial direction of the developing sleeve 2 is made smaller than the distance d 4 between the magnet roller 3 and the magnetic plate 5 in the radial direction of the developing sleeve 2.
- the reason why such a configuration is preferable will be described.
- FIG. 7 is a schematic view showing magnetic lines of force of the magnetic plate 5, the magnet seal 4 and the magnet roller 3 in the end seal configuration of the developing sleeve 2 of this embodiment.
- FIG. 7 particularly shows the vicinity of the loading portion 14 in the circumferential direction of the developing sleeve 2.
- the magnetic pole of the surface of the magnet seal 4 facing the developing sleeve 2 and the S3 pole have the same polarity.
- FIG. 8 is a schematic view showing lines of magnetic force when the magnetic pole of the surface of the magnet seal 4 facing the developing sleeve 2 and the S3 pole are different poles for comparison.
- the line of magnetic force Z is concentrated between the magnet seal 4 and the S3 pole, and the magnetic seal portion of the developer is not the end of the developing sleeve 2 in the axial direction.
- the magnetic flux density of the surface of the magnet seal 4 on the side facing the developing sleeve 2 is set to 600 G
- the magnetic flux density of the S3 pole is set to 250 G, which is weaker than that.
- the magnet seal 4 is disposed closer to the magnetic plate 5 than the S3 pole. That is, in the present embodiment, the outer diameter of the magnet roller 3 is 17.7 mm, and the distance d4 between the outer peripheral position of the magnet roller 3 in the radial direction of the developing sleeve 2 and the tip of the magnetic plate 5 is 1.85 mm. is there.
- the outer peripheral position of the magnet roller 3 and the outer peripheral position of the S3 pole can be regarded as the same.
- the distance d3 between the magnet seal 4 and the magnetic plate 5 in the axial direction of the developing sleeve 2 is 1.5 mm. Therefore, the magnetic plate 5 tends to be magnetized so as to follow the magnetic pole of the magnet seal 4 having a high magnetic flux density, and the tip end side of the magnetic plate 5 is N opposite to the surface of the magnet seal 4 facing the developing sleeve 2. Being magnetized to the pole, the magnetic circuit with the S3 pole tends to be strongly formed. That is, since the magnetic sealability at the leading end of the magnetic plate 5 is enhanced, a good magnetic sealability at this position can be secured.
- the effect of forming the repulsive magnetic field with the magnetic pole on the side facing the developing sleeve 2 of the magnet seal 4 and the S3 pole as the same pole is that the magnetic flux density of that side of the magnet seal 4 is S3 A magnetic flux density equal to or greater than the half-width region of the magnetic flux density can be sufficiently obtained. Further, in the present embodiment, since the side of the developer loading portion 14 into the developing container 1 has been described as an example, the magnetic circuit around the S3 pole has been described, but in the above mechanism, the developer transport direction contributes Absent. Therefore, the same effect can be obtained around the S2 pole from the completely same mechanism.
- the magnetic flux density of the S2 pole is set to be as small as 500 G with respect to the magnetic flux density 600 G of the surface of the magnet seal 4 facing the developing sleeve 2.
- the magnet seal 4 has the same polarity as the repulsive magnetic poles S2 and S3 on the surface facing the area of the magnetic flux density which is half the peak magnetic flux density of each of the repulsive magnetic poles S2 and S3 in the circumferential direction of the developing sleeve 2.
- the present invention can be applied to the case where the developer is a magnetic position component developer, and is similar to the above embodiment. An effect is obtained.
- the developing device is included in the process cartridge and is detachable from the main body of the image forming apparatus, but the present invention is not limited to this aspect.
- the present invention can be applied even when the developing device is mounted on the apparatus main body so that the developing device can not be easily detached. The same effect as the example can be obtained.
- a developing device capable of suppressing problems such as deterioration of the developer due to retention of the developer in the developer intake portion and rubbing due to rubbing of the developer with the developer carrier when using the magnetic seal member.
- An apparatus is provided.
- Reference Signs List 1 developing container 2 developing sleeve 3 magnet roller 4 magnet seal 5 magnetic plate 100 image forming device 104 developing device 110 process cartridge
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Abstract
Description
図2は現像装置の短手方向の断面図である。
図3は現像装置の長手方向の断面図である。
図4は現像スリーブの端部シール構成の模式図である。
図5はマグネットシール、磁性板の模式図である。
図6は現像スリーブの周方向におけるマグネットローラの磁束密度分布及び磁性板とマグネットシールの周方向の配置を説明するグラフ図である。
図7は一実施例における磁性板、マグネットシール、マグネットローラ間の磁力線を示す模式図である。
図8は比較例における磁性板、マグネットシール、マグネットローラ間の磁力線を示す模式図である。
2.現像装置
<現像装置の概要>
<現像装置の短手方向の断面構成>
<現像装置の長手方向の断面構成>
<現像スリーブ>
<マグネットローラ>
<現像スリーブの端部シール構成>
磁性板(外−外)間距離E<高搬送領域長さF<シール(内—内)間距離G
磁性板(内−内)間距離D:326.2mm±0.2mm
磁性板(外−外)間距離E:327.2mm±0.2mm
高搬送領域長さF:329±0.4mm
マグネットシール(内—内)間距離G:330.2±0.2mm
マグネットローラ長さH:330.6±6mm
その他
2 現像スリーブ
3 マグネットローラ
4 マグネットシール
5 磁性板
100 画像形成装置
104 現像装置
110 プロセスカートリッジ
Claims (8)
- 現像剤を収容する現像容器と、
現像剤を担持して像担持体へと搬送する搬送する回転可能な現像剤担持体と、
前記現像剤担持体の内部に配置され磁界を発生する磁界発生手段と、
前記現像剤担持体の軸線方向の両端部において、前記現像剤担持体の外周面に対して間隙を有してそれぞれ配置され、周囲の磁界によって磁化される一対の磁性部材と、
前記現像剤担持体の軸線方向の両端部において、前記現像剤担持体の外周面に対して間隙を有してそれぞれ配置され、磁界を発生する一対のマグネット部材であって、前記一対のマグネット部材は、前記現像剤担持体の軸線方向に関して、前記一対の磁性部材よりも外側に設けられ、前記一対の磁性部材に対して間隙を有して前記磁性部材を磁化するように前記磁性部材に対向して設けられた一対のマグネット部材と、
を有し、
前記現像剤担持体の軸線方向に関して、前記現像剤担持体の外周面は、前記像担持体上の画像形成領域に対応する現像領域を含む第1の領域と、前記第1の領域よりも外側で前記第1の領域に隣接し前記第1の領域よりも現像剤の搬送能力が低い、もしくは実質的に搬送能力を有さない第2の領域と、を有し、前記現像剤担持体の軸線方向に関して、前記第1の領域は、前記一対の磁性部材の各外側の側面で挟まれた領域よりも大きく、前記一対のマグネット部材の各内側面で挟まれた領域よりも小さい現像装置。 - 前記現像剤担持体の軸線方向の両端部における前記第1の領域と前記第2の領域との境界は、それぞれ前記一対の磁性部材の外側面に挟まれた領域よりも外側に配置され、かつ、前記一対のマグネット部材の内側面に挟まれた領域よりも内側に位置されるように設けられている請求項1に記載の現像装置。
- 前記現像剤担持体の軸線方向における前記磁界発生手段の両端部は、それぞれ前記現像剤担持体の軸線方向において前記現像剤担持体の外周面の前記第1の領域と前記第2の領域との境界よりも外側に位置する請求項1または2に記載の現像装置。
- 前記現像剤担持体の外周面の前記第1の領域は、前記現像剤担持体の軸線方向に沿う溝を有しており、前記現像剤担持体の外周面の前記第2の領域は、前記第1の領域の前記溝よりも深さが浅い前記溝を有するか又は前記溝を有していない請求項1乃至32いずれかに記載の現像装置。
- 前記磁界発生手段は、前記現像剤担持体の周方向に沿って、固定配置された複数の磁極を有し、前記複数の磁極は、互いに同極の隣り合う一対の反発磁極を備え、
前記マグネット部材は、前記現像剤担持体の周方向において、前記一対の反発磁極との間に形成される該一対の反発磁極の各磁極より低磁束密度の領域を内側に包含する範囲に延在し、
前記磁性部材は、前記現像剤担持体の周方向において、前記マグネット部材を内側に包含する範囲に延在し、
前記マグネット部材は、前記磁界発生手段と対向する面に、前記一対の反発磁極と同極の磁極を有する請求項1~4のいずれか一項に記載の現像装置。 - 前記マグネット部材は、前記現像剤担持体の周方向において、前記磁界発生手段の少なくとも前記一対の反発磁極の各磁極のピーク磁束密度の半分の磁束密度の領域と対向する面に、前記一対の反発磁極と同極の磁極を有する請求項5に記載の現像装置。
- 前記マグネット部材の、前記一対の反発磁極の各磁極に対向する面の磁束密度は、前記一対の反発磁極の各磁極の磁束密度より大きい請求項5又は6に記載の現像装置。
- 前記現像剤担持体の軸線方向における前記マグネット部材の前記現像剤担持体と対向する面と前記磁性部材の外側面との間の距離d3は、前記現像剤担持体の半径方向における前記マグネット部材の前記現像剤担持体と対向する面と前記現像剤担持体の外表面の間の距離d1、及び、前記現像剤担持体の半径方向における前記磁性部材の内表面と前記現像剤担持体の外表面の間の距離d2よりも大きい請求項1~7のいずれか一項に記載の現像装置。
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CN201580026897.8A CN106415403B (zh) | 2014-05-23 | 2015-05-22 | 显影设备、处理盒和图像形成装置 |
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JP2020030347A (ja) * | 2018-08-23 | 2020-02-27 | キヤノン株式会社 | 現像装置 |
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JPH1152731A (ja) * | 1997-08-01 | 1999-02-26 | Canon Inc | 現像装置 |
JP2002229336A (ja) * | 2000-12-01 | 2002-08-14 | Ricoh Co Ltd | 現像ローラ、現像装置及び画像形成装置 |
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SU1788510A1 (ru) * | 1990-10-01 | 1993-01-15 | Nii Elektrografii | Устройство для проявления электрографического изображения |
US5202729A (en) * | 1990-10-26 | 1993-04-13 | Canon Kabushiki Kaisha | Developing apparatus having a coated developing roller |
JPH09325617A (ja) * | 1996-06-04 | 1997-12-16 | Canon Inc | 現像装置 |
JP3352329B2 (ja) | 1996-07-26 | 2002-12-03 | キヤノン株式会社 | 現像装置およびこれを備えたプロセスカートリッジ |
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JP5006641B2 (ja) | 2006-12-22 | 2012-08-22 | キヤノン株式会社 | 画像形成装置 |
JP2011232536A (ja) * | 2010-04-27 | 2011-11-17 | Canon Inc | 現像装置 |
EP2469343B1 (en) * | 2010-12-24 | 2017-11-01 | Canon Kabushiki Kaisha | Developing device |
JP5751959B2 (ja) | 2011-07-05 | 2015-07-22 | キヤノン株式会社 | 現像装置 |
JP5932307B2 (ja) * | 2011-11-17 | 2016-06-08 | キヤノン株式会社 | 現像装置 |
JP6049296B2 (ja) | 2012-04-27 | 2016-12-21 | キヤノン株式会社 | 現像装置 |
JP2014122981A (ja) * | 2012-12-20 | 2014-07-03 | Canon Inc | 現像装置、プロセスカートリッジ、及び画像形成装置 |
JP2015155955A (ja) | 2014-02-20 | 2015-08-27 | キヤノン株式会社 | 現像装置 |
-
2014
- 2014-05-23 JP JP2014107606A patent/JP6320169B2/ja active Active
-
2015
- 2015-05-22 CN CN201580026897.8A patent/CN106415403B/zh active Active
- 2015-05-22 RU RU2016150541A patent/RU2650366C1/ru active
- 2015-05-22 WO PCT/JP2015/065488 patent/WO2015178505A1/ja active Application Filing
- 2015-05-22 EP EP15795692.1A patent/EP3147719B1/en active Active
- 2015-05-22 KR KR1020167035133A patent/KR101991558B1/ko active IP Right Grant
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2016
- 2016-11-16 US US15/353,008 patent/US10248050B2/en active Active
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JPH09218583A (ja) * | 1996-02-09 | 1997-08-19 | Canon Inc | 現像装置 |
JPH1152731A (ja) * | 1997-08-01 | 1999-02-26 | Canon Inc | 現像装置 |
JP2002229336A (ja) * | 2000-12-01 | 2002-08-14 | Ricoh Co Ltd | 現像ローラ、現像装置及び画像形成装置 |
JP2009151012A (ja) * | 2007-12-19 | 2009-07-09 | Canon Inc | 画像形成装置 |
JP2013050526A (ja) * | 2011-08-30 | 2013-03-14 | Canon Inc | 現像装置 |
Also Published As
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EP3147719A4 (en) | 2018-04-04 |
US10248050B2 (en) | 2019-04-02 |
EP3147719A1 (en) | 2017-03-29 |
US20170068188A1 (en) | 2017-03-09 |
EP3147719B1 (en) | 2021-03-03 |
JP6320169B2 (ja) | 2018-05-09 |
CN106415403A (zh) | 2017-02-15 |
RU2650366C1 (ru) | 2018-04-11 |
CN106415403B (zh) | 2020-01-17 |
KR20170010386A (ko) | 2017-01-31 |
KR101991558B1 (ko) | 2019-06-20 |
JP2015222403A (ja) | 2015-12-10 |
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