JP4920984B2 - Magnet roller, developer carrier, developing device, process cartridge, image forming apparatus - Google Patents

Description

The present invention is a copying machine, a facsimile, a magnet roller used in an image forming apparatus such as a printer, a developer carrying member having the magnet roller, a process cartridge having a developer carrying member, the image forming apparatus having the process cartridge Related.

  In recent years, the “high-function developing device that develops a latent image formed on an image carrier using a two-component developer composed of toner and magnetic particles” (SLIC developing device) has been attracting attention. Although it achieves high image quality with respect to the two-component developing device, the magnet roller mounted on this SLIC developing device is higher in magnet material because the angle between the poles of the main pole portion is narrower than that of the conventional magnet roller. Magnetic properties are required. For this reason, as the magnet material, it is difficult to achieve necessary magnetic characteristics with a ferrite magnet generally used conventionally, and it is necessary to use a rare earth magnet.

  On the other hand, since the rare earth magnet is expensive, it is desirable to use a rare earth magnet only for the main pole portion that requires a high magnetic force and a ferrite magnet for the other poles as a practical magnet roller configuration. Specifically, a configuration in which a rare earth magnet formed in a block shape is embedded in a concave groove portion provided in a main pole portion of a ferrite magnet formed in a cylindrical shape is desirable. The most common method for connecting the rare earth magnet and the ferrite magnet is to use an adhesive.

  However, when an adhesive is used as the bonding method, the adhesive spread when the rare earth magnet is pressed into the groove portion to which the adhesive has been applied protrudes to the outside of the groove portion, and this adhesive is manufactured. There has been a problem that it may cause defects in the assembly process of the magnet roller due to adhesion to the equipment. Further, there is a problem in that the magnet roller becomes expensive due to generation of useless adhesive by protruding and cost of management of the adhesive to guarantee the yield rate. Therefore, the present applicant has proposed a magnet roller as a means for solving such problems by providing a recess for preventing the adhesive from protruding on the outer periphery of the rare earth magnet so that excess adhesive flows into the recess. (Japanese Patent Laid-Open No. 2005-92055).

FIG. 18 is a perspective view showing an example of a magnet roller having a concave portion for preventing the adhesive from protruding on the outer periphery of the rare earth magnet. In FIG. 18, 110 is a magnet roller, 101 is a cylindrical magnet molded body made of a ferrite plastic magnet, 102 is a groove provided in the main pole portion, and 103 is a rare earth element. A magnet, 104 is a cored bar, 105 is a recess formed over the entire length in the longitudinal direction of the rare earth magnet, and 106 is an adhesive applied to the groove for attaching the rare earth magnet. . When the magnet roller 110 presses the rare earth magnet 103 against the groove portion 102 to which the adhesive 106 is applied, the excess adhesive 106 flows into the concave portion 105, so that the gap 102 and the rare earth magnet 103 are inserted between the groove portion 102 and the outside of the groove portion 102. This prevents the adhesive 106 from protruding.
JP 2005-92055 A

  However, in the magnet roller 110 shown in FIG. 18, since the concave portion 105 is formed over the entire length of the rare earth magnet 103, the adhesive 106 that has flowed into the concave portion 105 extends from both ends of the concave portion 105 to the outside of the groove portion 102. Sometimes it drooped.

  The present invention aims to solve this problem.

That is, the present invention provides a magnet with excellent mass productivity and low cost by preventing the adhesive from sticking out and dripping when a rare earth magnet is attached to the groove portion of the cylindrical magnet molded body via an adhesive. It is an object of the present invention to provide a roller, a developer carrier having the magnet roller, a process cartridge having the developer carrier, and an image forming apparatus having the process cartridge.

  In order to solve the above problems and achieve the object, the invention described in claim 1 is characterized in that another member is provided in a portion corresponding to the pole of a cylindrical magnet molded body formed of a plastic magnet containing magnetic powder. A magnet in which at least one concave groove that can be embedded is provided, and a long magnet molded body having a higher magnetic force than the plastic magnet of the cylindrical magnet molded body is disposed in the groove via an adhesive. In the roller, a recess for preventing the adhesive from protruding is provided on at least one of the surfaces where the surface of the groove and the surface of the elongated magnet molded body are in contact, and so as to surround the outer periphery of the recess. A wall for preventing dripping of the provided adhesive is provided, and the depth from the surface where the surface of the groove and the surface of the long magnet molded body are in contact to the bottom of the concave portion is Axial end from the direction the central portion, or a magnet roller wherein the gradually shallower toward the widthwise end portions from the central portion in the width direction.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, the planar shape of the recess is circular, rectangular or spiral.

  The invention described in claim 3 is the invention described in claim 1 or 2, wherein a plurality of the recesses are provided along an axial direction of the magnet roller and a direction orthogonal to the axial direction. It is characterized by this.

  The invention described in claim 4 is characterized in that, in the invention described in any one of claims 1 to 3, the concave portion is provided at an application position of the adhesive. .

  The invention described in claim 5 is the invention described in any one of claims 1 to 4, wherein the surface of the groove and the long magnet molded body are provided in the recess and from the bottom surface of the recess. And a convex portion projecting toward the surface in contact with the surface of the adhesive, and the convex portion is provided at an application position of the adhesive.

  The invention described in claim 6 is characterized in that, in the invention described in claim 5, the planar shape of the convex portion is circular or rectangular.

  The invention described in claim 7 is the wall according to the invention described in any one of claims 1 to 6, wherein a plurality of the recesses are provided, and the adjacent recesses are arranged between the recesses. It is characterized by being connected through the part.

  The invention described in claim 8 is the invention described in any one of claims 1 to 7, from the surface where the surface of the groove and the surface of the long magnet molded body are in contact to the bottom surface of the recess. The depth of this is 0.01 mm or more.

  According to a ninth aspect of the present invention, there is provided a developer carrier comprising a rotatable nonmagnetic cylindrical body on the outer periphery of the magnet roller according to any one of the first to eighth aspects.

  According to a tenth aspect of the present invention, in the developing device having at least a developer carrier, a developer supply member, a developer layer regulating member, and a developer, the developer carrier according to the ninth aspect. A developing device having a developer carrying member.

  The invention described in claim 11 is a process cartridge having at least a developing device, an image carrier, and a charging means, wherein the developing device includes the developing device according to claim 10 as the developing device. .

  According to a twelfth aspect of the present invention, in the image forming apparatus having at least a process cartridge, an optical writing unit, a transfer member, and a fixing device, the process cartridge according to the eleventh aspect is provided as the process cartridge. An image forming apparatus.

  According to the first to third aspects of the invention, when the long magnet molded body is attached to the groove portion of the cylindrical magnet molded body via the adhesive, the adhesive is in the recess for preventing the adhesive from protruding. Since the adhesive that spreads and is spread by the wall for preventing the adhesive from dripping, it is possible to prevent the adhesive from sticking out and dripping, which may cause problems in the assembly process of the magnet roller. Further, it is possible to provide a magnet roller that is excellent in mass productivity and low in cost, because wasteful adhesive is not generated, and adhesive management costs can be omitted. Further, by changing the depth of the recess from the axial center to the axial end of the magnet roller, or from the width central to the width end, the adhesive can be easily spread into the recess. Therefore, the joint strength between the cylindrical magnet molded body and the long magnet molded body can be further improved.

  According to the invention described in claim 4, since the concave portion is provided at the position where the adhesive is applied, the adhesive spreads only into the concave portion, and therefore, the protrusion and drooping of the adhesive can be further ensured. Can be prevented.

  According to the invention described in claims 5 and 6, the convex portion provided at the application position of the adhesive spreads the adhesive so that the adhesive spreads over a wide range. Bonding strength with the long magnet compact can be improved. Further, since the adhesive pushed out by the convex portion flows into the concave portion located around the convex portion, the adhesive can be prevented from protruding and dripping.

  According to the seventh aspect of the present invention, since the wall portion between the recesses is penetrated and the plurality of recesses are connected, the adhesive spreads over a wide range. The joint strength with the magnet molded body can be further improved.

  According to the invention described in claim 8, when a low-viscosity adhesive is used in the present invention, the adhesive bonds 0.01 to 0 to bond the cylindrical magnet compact and the long magnet compact. Since a film thickness of about 0.02 mm is formed, the cylindrical magnet molded body and the long magnet molded body can be joined under optimum conditions by setting the depth of the recess to 0.01 mm or more.

  According to the ninth aspect of the present invention, since the developer carrying member having the nonmagnetic cylindrical body that can rotate on the outer periphery of the magnet roller according to any one of the first to eighth aspects, the cost is reduced. Is possible.

  According to the tenth aspect of the present invention, in the developing device having at least a developer carrier, a developer supply member, a developer layer regulating member, and a developer, Since the developer carrying member described is included, the cost can be reduced.

  According to the eleventh aspect of the invention, in the process cartridge having at least the developing device, the image carrier, and the charging unit, the developing device according to the tenth aspect is provided as the developing device. Is possible.

  According to the twelfth aspect of the present invention, in an image forming apparatus having at least a process cartridge, an optical writing unit, a transfer member, and a fixing device, the process cartridge according to the eleventh aspect is included. Therefore, the cost can be reduced.

(First Reference Embodiment)
FIG. 1 is a perspective view of a magnet roller according to a first embodiment as a premise of the present invention. FIG. 2 is a view showing a long magnet molded body constituting the magnet roller shown in FIG. 1, (a) is a perspective view of the long magnet molded body, and (b) is (a). It is the front view seen from the arrow A direction of the long magnet molded object shown by (c), (c) is sectional drawing along the B1-B1 line | wire of the long magnet molded object shown by (a). . FIG. 3 is a conceptual explanatory view for explaining a method of manufacturing the long magnet molded body shown in FIG. FIG. 4 is a conceptual explanatory view for explaining another method of manufacturing the long magnet molded body shown in FIG. FIG. 5 is a conceptual explanatory view for explaining still another manufacturing method of the long magnet molded body shown in FIG.

  As shown in FIG. 1, the magnet roller 10 of the first reference embodiment has a portion corresponding to the pole of a cylindrical magnet molded body 1 formed of a ferrite-based plastic magnet containing magnetic powder. At least one concave groove 2 that can be embedded with another member is provided, and a long magnet molded body 3 having a higher magnetic force than the plastic magnet of the cylindrical magnet molded body 1 is bonded to the concave groove 2. It is arranged through the agent. The magnet roller 10 is provided with a recess 3a for preventing the adhesive from protruding on at least one surface of the "surface where the surface of the groove 2 and the surface of the long magnet molded body 3 are in contact". An adhesive dripping prevention wall 3b is provided so as to surround the outer periphery of the recess 3a (see FIGS. 2B and 2C). In FIG. 1, 4 is a metal core. Moreover, the premise structure of this magnet roller 10 is applicable not only to this reference embodiment but this invention. That is, in the magnet roller 10 of the present embodiment and the magnet roller of the present invention, the shapes of the recess 3a and the wall 3b are different, and the other parts have the same configuration.

  In the present specification, the “surface where the surface of the groove and the surface of the long magnet molded body are in contact” refers to a virtual surface formed between the groove 2 and the long magnet molded body 3. It means a plane. Further, the “concave portion opened in at least one of the surfaces where the surface of the groove portion and the surface of the long magnet molded body are in contact” is provided on the groove portion 2 side and the “surface of the groove portion and the long magnet molded body” Both the concave portion opened in the “surface in contact with the surface of the surface” and the concave portion provided on the long magnet molded body 3 side and opened in the “surface in contact with the surface of the groove portion and the surface of the long magnet molded body”. Contains. That is, in this invention, the said recessed part may be provided in the groove part 2 side, and may be provided in the elongate magnet molded object 3 side. Moreover, you may provide in both the groove part 2 side and the elongate magnet molded object 3 side.

  As described above, the magnet roller 10 is provided with the concave portion 3a for preventing the adhesive from protruding on at least one surface of the “surface where the surface of the groove portion 2 and the surface of the long magnet molded body 3 are in contact”, and If the adhesive dripping prevention wall 3b provided so as to surround the outer periphery of the recess 3a is provided, the adhesive is applied when the long magnet molded body 3 is attached to the groove 2 via the adhesive. Since the adhesive that spreads in the recess 3a and spreads is blocked by the wall 3b, it is possible to prevent the adhesive from protruding and dripping. For this reason, the assembly process of the magnet roller 10 is not caused to be defective or wasteful adhesive is not generated, and the cost for managing the adhesive can be omitted, and the mass productivity is excellent. In addition, the low-cost magnet roller 10 can be provided.

  The adhesive used in the present invention is preferably a low viscosity adhesive. This low viscosity adhesive forms a film thickness of about 0.01 to 0.02 mm to join the cylindrical magnet molded body 1 and the long magnet molded body 3 together. For this reason, in this invention, the depth from the "surface where the surface of the groove part 2 and the surface of the long magnet molded body 3 are in contact" of the recess 3a to the bottom of the recess 3a is 0.01 mm or more, and cylindrical magnet molding is performed. The body 1 and the long magnet molded body 3 are joined under optimum conditions. When a high-viscosity adhesive is used, the film thickness becomes thicker than when a low-viscosity adhesive is used, but by forming the depth of the recess 3a deep according to this film thickness, a cylindrical magnet is formed. The body 1 and the long magnet molded body 3 can be joined under optimum conditions.

  In the first reference embodiment, as shown in FIGS. 2A to 2C, the concave portion 3a is provided on the long magnet molded body 3 side, and the concave portion 3a is a long magnet. It is provided over the entire length of the molded body 3, that is, the axial direction of the magnet roller 10. The recess 3a is formed in a rectangular shape in plan view. The wall 3b is formed in a rectangular frame shape so as to surround the rectangular recess 3a. Further, the depth h1 of the concave portion 3a from the “surface where the surface of the groove portion 2 and the surface of the long magnet molded body 3 are in contact with each other” is formed to be 0.01 mm. Such a long magnet molded body 3 is joined to the cylindrical magnet molded body 1 by being pressed against the groove portion 2 in a state where an adhesive is applied. At this time, the adhesive is spread by the long magnet molded body 3 between the long magnet molded body 3 and the groove 2 and in the recess 3a. The spread adhesive is prevented from protruding outside the groove 2 by the wall 3b formed so as to surround the recess 3a.

  The long magnet molded body 3 in the first reference embodiment is obtained by compression-molding a magnet compound 80 (see FIG. 3) containing magnet powder and thermoplastic resin fine particles in a magnetic field. 3 is formed by the manufacturing apparatus 70 shown in FIG. The manufacturing apparatus 70 is disposed at a position facing the punch 63 inside the magnetic field applying and aligning apparatus, a punch 63 as a pressing member mounted and fixed to a punch holder (not shown), a magnetic field applying and aligning apparatus not shown. The long magnet molded body 3 is provided with a molding die 60 for compression molding and a cavity 61 of the molding die 60 that can be projected and retracted (the moving direction is indicated by an arrow K), and is a long magnet. An ejector pin 62 formed in the shape of the concave portion 3a of the molded body 3 and an inverted shape is provided. In addition, the orientation direction of the long magnet molded body 3 formed by the manufacturing apparatus 70 is parallel to the elevation direction of the punch 63.

  When the long magnet molded body 3 is molded by the manufacturing apparatus 70, the punch 63 is protruded into the cavity 61 by the depth of the recess 3 a of the long magnet molded body 3 for molding the ejector pin 62 in advance. It is set in a state separated from the molding die 60, and the magnet compound 80 is filled into the cavity 61 in this state. Then, the magnetic compound orientation is applied to the magnet compound 80 by the magnetic field application orientation device, and the magnet compound 80 is compressed by fitting the punch 63 into the cavity 61 to form the long magnet molded body 3. The molded long magnet molded body 3 is taken out of the cavity 61 by being pushed out by the ejector pin 62.

  In the first reference embodiment, the elongated magnet molded body 3 thus protrudes into the cavity 61 by the depth of the recess 3a in which the ejector pin 62 formed in the shape opposite to the shape of the recess 3a is formed. Since the compression molding is performed by the molding die 60 in a state of being made, the concave portion 3a can be formed only by processing the ejector pin 62, and the depth of the concave portion 3a can be simply adjusted by adjusting the protruding amount of the ejector pin 62. The long magnet molded body 3 can be provided simply and at low cost. In the present invention, the depth of the recess 3a is set to 0.01 mm or more in accordance with the low-viscosity adhesive to be used, but the depth of the recess 3a is optimal for the adhesive to be used. The depth is set as appropriate.

  Moreover, the long magnet molded object 3 in 1st reference embodiment can also be shape | molded with the manufacturing apparatus 170 shown in FIG. In this manufacturing apparatus 170, the surface of the punch 163 as a pressure member disposed at a position facing the molding die 160 for compression molding is formed in a shape reverse to the shape of the concave portion 3 a of the long magnet molded body 3. ing. The molding die 160 is composed of a pair of split dies 160 a and 160 b that are arranged so as to be able to contact and separate from each other in a direction orthogonal to the lifting and lowering direction of the punch 163. The term “contact / separation” as used herein refers to approaching or leaving each other. Further, the orientation direction of the long magnet molded body 3 formed by the manufacturing apparatus 170 is parallel to the elevation direction of the punch 163. When forming the long magnet molded body 3 with the manufacturing apparatus 170, the punch 163 is separated from the molding die 160, and the pair of split dies 160a and 160b are set in contact with each other. The magnet compound 80 is filled in the cavity 161. Then, the magnetic compound orientation is applied to the magnet compound 80 by the magnetic field application orientation device, and the magnet compound 80 is compressed by fitting the punch 163 into the cavity 161 to form the long magnet molded body 3. The molded long magnet molded body 3 is taken out of the cavity 161 by separating the pair of split molds 160a and 160b from each other.

  Furthermore, the long magnet molded body 3 in the first reference embodiment can be molded by the manufacturing apparatus 270 shown in FIG. The manufacturing apparatus 270 includes a pair of split dies 260 a and 260 b in which a molding die 260 is arranged so as to be able to come in contact with and separate from each other in a direction orthogonal to the lifting and lowering direction of the punch 63. Further, the side surface of the one split mold 260b facing the other split mold 260a is formed in a shape reverse to that of the concave portion 3a of the long magnet molded body 3. Further, the orientation direction of the long magnet molded body 3 formed by the manufacturing apparatus 270 is a direction perpendicular to the elevation direction of the punch 63. When the long magnet molded body 3 is formed by the manufacturing apparatus 270, the punch 63 is separated from the molding die 160 and the pair of split molds 260a and 260b are set in contact with each other. The magnet compound 80 is filled into the cavity 261. Then, the magnetic compound orientation is applied to the magnet compound 80 by the magnetic field application orientation device, and the magnet compound 80 is compressed by fitting the punch 163 into the cavity 161 to form the long magnet molded body 3. The molded long magnet molded body 3 is taken out of the cavity 261 by separating the pair of split molds 260a and 260b from each other. In the manufacturing apparatus 270, the side surface of the other split mold 260a may be formed in an inverted shape with respect to the shape of the recess 3a of the long magnet molded body 3, or both side surfaces of the split molds 260a and 260b are formed into a long magnet. The shape of the recess 3a of the body 3 may be reversed with respect to the shape.

  Moreover, the manufacturing method of the elongate magnet molded object 3 using the manufacturing apparatus 70,170,270 mentioned above is applicable not only to this reference embodiment but this invention.

  The “magnet powder” constituting the “long magnet molded body 3” is preferably composed of an Nd—Fe—B-based material or an Sm—Fe—N-based material, and the average particle size thereof is 30 to It is 200 micrometers, Preferably it is 80-150 micrometers, More preferably, it is 100-120 micrometers amorphous particles.

  The “thermoplastic resin” in the thermoplastic resin fine particles constituting the “long magnet molded body 3” is, for example, a homopolymer composed of a styrene compound such as polystyrene, polychloroethylene, polyvinyltoluene, and the like, and a substitution product thereof, and Styrene-p-chlorostyrene copolymer, styrene-propylene copolymer, styrene-vinyltoluene copolymer, styrene-vinylnaphthalene copolymer, styrene-methyl acrylate copolymer, styrene-ethyl acrylate copolymer Polymer, styrene-butyl acrylate copolymer, styrene-octyl acrylate copolymer, styrene-methyl methacrylate copolymer, styrene-ethyl methacrylate copolymer, styrene-butyl methacrylate copolymer, styrene-α -Chloromethyl methacrylate copolymer, styrene-acrylonitrile Ryl polymer, styrene-vinyl methyl ether polymer, styrene-vinyl methyl ketone polymer, styrene-butadiene copolymer, styrene-isoprene copolymer, styrene-acrylonitrile-indene copolymer, styrene-maleic acid copolymer And styrene-based copolymers such as styrene-maleic acid ester copolymers. The “thermoplastic resin” includes polymethyl methacrylate, polybutyl methacrylate, polyvinyl chloride, polyvinyl acetate, polyethylene, polypropylene, polyester, polyvinyl butyl butyral, polyacrylic acid resin, rosin, modified rosin, terpene resin, phenol. A resin such as a resin or an epoxy polyol resin may be used. These resins can be used alone or in combination.

(Second Reference Embodiment)
FIG. 7 is a view showing a long magnet molded body constituting the magnet roller according to the second reference embodiment, (a) is a perspective view of the long magnet molded body, and (b) is ( It is the front view seen from the arrow A direction of the long magnet molded object shown by a), (c) is sectional drawing along the B2-B2 line of the long magnet molded object shown by (a). It is. In the figure, the same components as those in the first reference embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the second reference embodiment, as shown in FIGS. 7A to 7C, the concave portion 3a is provided on the long magnet molded body 3 side, and the concave portion 3a is a long magnet. It is provided over the entire length of the molded body 3, that is, the axial direction of the magnet roller 10. The recess 3a is formed in a rectangular shape in plan view. The wall 3b is formed in a rectangular frame shape so as to surround the rectangular recess 3a. Further, a plurality of such recesses 3 a are arranged along the width direction of the long magnet molded body 3, that is, the direction orthogonal to the axial direction of the magnet roller 10.

  The configuration in which a plurality of the recesses 3a are arranged along the direction orthogonal to the axial direction of the magnet roller 10 is applicable not only to the present embodiment but also to the present invention.

(Third reference embodiment)
FIG. 8 is a view showing a long magnet molded body constituting the magnet roller according to the third embodiment, (a) is a perspective view of the long magnet molded body, and (b) is ( It is the front view seen from the arrow A direction of the long magnet molded object shown by a), (c) is sectional drawing along the B3-B3 line | wire of the long magnet molded object shown by (a). It is. In the figure, the same components as those in the first and second reference embodiments described above are denoted by the same reference numerals and description thereof is omitted.

  In the third reference embodiment, as shown in FIGS. 8A to 8C, the concave portion 3a is provided on the long magnet molded body 3 side, and the concave portion 3a is a long magnet. The planar shape is formed in a spiral shape over the entire area of the molded body 3. Further, the wall 3b is formed so as to surround the spiral recess 3a. That is, the wall 3b is also formed in a spiral shape.

  The configuration in which the planar shape of the recess 3a is a spiral shape is applicable not only to the present embodiment but also to the present invention.

(Fourth embodiment)
FIG. 9 is a view showing a long magnet molded body constituting the magnet roller according to the fourth reference embodiment, (a) is a perspective view of the long magnet molded body, and (b) is ( It is the front view seen from the arrow A direction of the long magnet molded object shown by a), (c) is sectional drawing along the B4-B4 line of the long magnet molded object shown by (a). It is. In the figure, the same components as those in the first to third embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the fourth reference embodiment, as shown in FIGS. 9A to 9C, the recess 3a is provided on the long magnet molded body 3 side, and the recess 3a has a planar shape. It is formed in a spiral shape. Further, a plurality of such recesses 3 a are arranged along the longitudinal direction of the long magnet molded body 3, that is, the axial direction of the magnet roller 10.

  Further, the configuration in which a plurality of the recesses 3a are arranged along the axial direction of the magnet roller 10 is applicable not only to the present embodiment but also to the present invention.

(Fifth Reference Embodiment)
FIG. 10 is a view showing a long magnet molded body constituting the magnet roller according to the fifth reference embodiment, (a) is a perspective view of the long magnet molded body, and (b) is ( It is the front view seen from the arrow A direction of the long magnet molded object shown by a), and is explanatory drawing explaining the relationship between this long magnet molded object and a cylindrical magnet molded object, (c) is It is sectional drawing along the B5-B5 line | wire of the long magnet molded object shown by (a). In the figure, the same components as those in the first to fourth reference embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.

  In 5th reference embodiment, as shown to Fig.10 (a)-(c), the said recessed part 3a is provided in the elongate magnet molded object 3 side. The recess 3a has a circular planar shape. A plurality of such recesses 3 a are arranged along the longitudinal direction of the long magnet molded body 3, that is, the axial direction of the magnet roller 10. Further, in the fifth reference embodiment, the concave portion 3 a is provided at the application position of the adhesive applied to the groove portion 2. In FIG. 10 (b), 5 is an adhesive applied to the surface of the groove 2. As shown by the alternate long and short dash line in FIG. 10B, the central portion of each recess 3 a is overlapped with the adhesive 5 when the long magnet molded body 3 is pressed against the groove portion 2. Moreover, all the recessed parts 3a are connected by the penetration groove | channel 3c which penetrated the wall part 3b between the recessed parts 3a adjacent to each other in the some recessed part 3a. The adhesive 5 that is overlapped with the central portion of each of the recesses 3a and is spread in the recesses 3a reaches the entire area of the long magnet molded body 3 through the through grooves 3c.

  Thus, in the fifth reference embodiment, since the wall 3b between the adjacent recesses 3a is penetrated and the plurality of recesses 3a are connected, the adhesive 5 spreads over a wide range. A large bonding area can be taken, and therefore, the bonding strength between the cylindrical magnet molded body 1 and the long magnet molded body 3 can be further improved.

  Further, the configuration in which the planar shape of the recess 3a is circular, the configuration in which the recess 3a is provided at the position where the adhesive is applied to the groove 2, and the plurality of recesses 3a are connected by a through groove 3c penetrating the wall 3b. The structure applied is applicable not only to the present embodiment but also to the present invention.

(Sixth embodiment)
FIG. 11: is a figure which shows the long magnet molded object which comprises the magnet roller which concerns on 6th reference embodiment, (a) is a perspective view of a long magnet molded object, (b) is ( It is the front view seen from the arrow A direction of the long magnet molded object shown by a), and is explanatory drawing explaining the relationship between this long magnet molded object and a cylindrical magnet molded object, (c) is It is sectional drawing along the B6-B6 line | wire of the elongate magnet molded object shown by (a). In the figure, the same components as those in the first to fifth embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.

  In 6th reference embodiment, as shown to Fig.11 (a)-(c), the said recessed part 3a is provided in the elongate magnet molded object 3 side. The recess 3a has a circular planar shape. A plurality of such recesses 3 a are arranged along the longitudinal direction of the long magnet molded body 3, that is, the axial direction of the magnet roller 10. In the sixth reference embodiment, a two-component mixed type adhesive 5 that is used by mixing the first component 5a and the second component 5b is used. And while the recessed part 3a is provided in the application | coating position of 1 liquid 5a or 2 liquid 5b apply | coated to the groove part 2, two adjacent recessed parts 3a are the penetration groove | channel 3c so that different liquids 5a and 5b may mix. Are connected by The liquids 5 a and 5 b spread in the recess 3 a by pressing the long magnet molded body 3 against the groove 2 are mixed with each other through the through groove 3 c and function as the adhesive 5.

  Thus, in 6th reference embodiment, since several recessed part 3a can be connected so that different liquid 5a, 5b may mix, 2 liquid mixing type adhesive agent 5 can be used. . Thus, since the choice of the adhesive spreads, an optimal adhesive can be used according to conditions, so that the bonding strength between the cylindrical magnet molded body 1 and the long magnet molded body 3 can be further improved. it can.

(Seventh embodiment)
FIG. 12 is a view showing a long magnet molded body constituting the magnet roller according to the seventh reference embodiment, (a) is a perspective view of the long magnet molded body, and (b) is ( It is the front view seen from the arrow A direction of the long magnet molded object shown by a), (c) is sectional drawing along the B7-B7 line | wire of the long magnet molded object shown by (a). It is. In the figure, the same components as those in the first to sixth embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the seventh reference embodiment, as shown in FIGS. 12A to 12C, the recess 3 a is provided on the long magnet molded body 3 side, and the recess 3 a is a long magnet. It is provided over the entire length of the molded body 3, that is, the axial direction of the magnet roller 10. The recess 3a is formed in a rectangular shape in plan view. The wall 3b is formed in a rectangular frame shape so as to surround the rectangular recess 3a. Furthermore, in the seventh reference embodiment, a convex portion provided in the concave portion 3a and projecting from the bottom surface of the concave portion 3a toward the "surface where the surface of the groove portion 2 and the surface of the long magnet molded body 3 are in contact". 3d is provided. The convex portion 3d has a rectangular planar shape. Moreover, this convex part 3d is provided in the application position of the adhesive.

  As described above, in the sixth reference embodiment, the convex portion 3d provided at the adhesive application position spreads the adhesive so that the adhesive spreads over a wide range. Therefore, the bonding strength between the cylindrical magnet molded body 1 and the long magnet molded body 3 can be improved. Moreover, since the adhesive spread by the convex part 3d flows into the concave part 3a arranged around the convex part 3d, the adhesive can be prevented from protruding and dripping.

  Further, the configuration in which the convex portion 3d is provided in the concave portion 3a, the convex portion 3d is provided at the application position of the adhesive, and the configuration in which the planar shape of the convex portion 3d is rectangular is only in the present embodiment. Not applicable to the present invention.

(Eighth reference embodiment)
FIG. 13: is a figure which shows the long magnet molded object which comprises the magnet roller which concerns on 8th reference embodiment, (a) is a perspective view of a long magnet molded object, (b) is ( It is the front view seen from the arrow A direction of the long magnet molded object shown by a), (c) is sectional drawing along the B8-B8 line | wire of the long magnet molded object shown by (a). It is. In the figure, the same components as those in the first to seventh embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.

  In the eighth reference embodiment, as shown in FIGS. 13A to 13C, the concave portion 3a is provided on the long magnet molded body 3 side. The recess 3a has a circular planar shape. A plurality of such recesses 3 a are arranged along the longitudinal direction of the long magnet molded body 3, that is, the axial direction of the magnet roller 10. Moreover, the some recessed part 3a is connected by the through-groove 3c which penetrated the wall part 3b between the adjacent recessed parts 3a. Further, in each recess 3a, a protrusion 3d is provided that protrudes from the bottom surface of the recess 3a toward the "surface where the surface of the groove 2 and the surface of the long magnet molded body 3 are in contact". Moreover, this convex part 3d is provided in the application position of the adhesive. Furthermore, in the eighth reference embodiment, the convex portion 3d has a circular planar shape.

  In addition, the configuration in which the convex portion 3d is provided in the concave portion 3a, the convex portion 3d is provided at the position where the adhesive is applied, and the configuration in which the planar shape of the convex portion 3d is circular are only in this reference embodiment. Not applicable to the present invention.

(First embodiment)
FIG. 14 is a view showing a long magnet molded body constituting the magnet roller according to the first embodiment of the present invention, (a) is a perspective view of the long magnet molded body, and (b) is a view. It is the front view seen from the arrow A direction of the long magnet molded object shown by (a), (c) was along the C1-C1 line of the long magnet molded object shown by (a). It is sectional drawing, (d) is sectional drawing along the B9-B9 line | wire of the elongate magnet molded object shown by (a). In the figure, the same components as those in the first to eighth embodiments described above are denoted by the same reference numerals, and the description thereof is omitted.

  In this embodiment, as shown to Fig.14 (a)-(d), while the said recessed part 3a is provided in the elongate magnet molded object 3 side, this recessed part 3a is the elongate magnet molded object 3 Is provided over the entire length in the longitudinal direction, that is, in the axial direction of the magnet roller 10. The recess 3a is formed in a rectangular shape in plan view. Furthermore, in this embodiment, the depth from the “surface where the surface of the groove portion 2 and the surface of the long magnet molded body 3 contact” of the concave portion 3 a to the bottom surface of the concave portion 3 a is the length of the long magnet molded body 3. It is formed so as to gradually become shallower from the central portion 3X in the direction to the end portion 3Y in the longitudinal direction. As shown in FIG. 14C, the depth h2 of the central portion 3X is formed to 0.02 mm, and the depth h1 of the end portion 3Y is formed to 0.01 mm.

  As described above, in the present invention, the depth of the concave portion 3a is extended from the longitudinal central portion 3X to the longitudinal end portion 3Y of the long magnet molded body 3, that is, from the 10 axial central portion to the axial end of the magnet roller. By changing over the part, the adhesive is easily spread in the recess 3a. Further, since the adhesive has a characteristic of flowing from a wide place to a narrow place, in this embodiment, the concave portion 3a extends from the longitudinal central portion 3X to the longitudinal end portion 3Y of the long magnet molded body 3. The depth is gradually reduced, and the adhesive is applied to the central portion 3X of the recess 3a. For this reason, an adhesive agent becomes easy to spread in the recessed part 3a, and the joint strength of the cylindrical magnet molded object 1 and the elongate magnet molded object 3 can further be improved. Although not shown, in the present invention, the depth of the concave portion 3a extends from the center portion in the width direction of the long magnet molded body 3 to the end portion in the width direction, that is, from the center portion in the width direction of the magnet roller 10 to the width. You may make it change over a direction edge part.

(Second Embodiment)
FIG. 15 is a view showing a long magnet molded body constituting the magnet roller according to the second embodiment of the present invention, (a) is a perspective view of the long magnet molded body, and (b) is a perspective view of the long magnet molded body. It is the front view seen from the arrow A direction of the long magnet molded object shown by (a), (c) was along the C2-C2 line | wire of the long magnet molded object shown by (a). It is sectional drawing, (d) is sectional drawing along the B10-B10 line | wire of the elongate magnet molded object shown by (a). FIG. 16 is a conceptual explanatory view for explaining a method of manufacturing the long magnet molded body shown in FIG. FIG. 17 is a conceptual explanatory diagram for explaining another method for producing the long magnet molded body shown in FIG. 15. In the figure, the same components as those in the first to eighth reference embodiments and the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted.

  In this embodiment, as shown to Fig.15 (a)-(d), the said recessed part 3a is provided in the elongate magnet molded object 3 side. The recess 3a is formed in a rectangular shape in plan view. A plurality of such recesses 3 a are arranged along the longitudinal direction of the long magnet molded body 3, that is, the axial direction of the magnet roller 10. Each of these recesses 3a has a depth from the "surface where the surface of the groove 2 and the surface of the long magnet molded body 3 are in contact" to the bottom surface of the recess 3a, from the center portion in the longitudinal direction of the recess 3a It is formed so as to become shallower gradually. As shown in FIG.15 (c), the depth h2 of the center part of the longitudinal direction of this recessed part 3a is formed in 0.02 mm, and the depth h1 of the edge part of the longitudinal direction of the recessed part 3a is 0.01 mm. Is formed. And an adhesive agent is apply | coated to the center part of the longitudinal direction of this recessed part 3a.

  The long magnet molded body 3 in the present embodiment is obtained by injection molding a magnet compound 80 (see FIG. 16) containing a melted magnet powder and thermoplastic resin fine particles. Is formed by the manufacturing apparatus 87 shown in FIG. The manufacturing apparatus 87 includes a hopper 85 for kneading and melting the magnet compound 80, a runner 84 for conveying the melted magnet compound 80 toward a plurality of molding dies 81, and a branch from the runner 84. The nozzle 83 for injecting the magnet compound 80 into the cavity 82 of each molding die 81 is provided so as to be able to come in contact with and separate from each other in the thickness direction of the long magnet molded body 3, and the cavity 82 is formed by contacting each other. A molding die 81 for injection molding composed of a pair of split molds 81a and 81b to be formed, and a long magnet provided in a freely projecting and retracting manner (indicated by the arrow K) in the cavity 82. An ejector pin 62 formed in the shape of the concave portion 3a of the molded body 3 and an inverted shape is provided. Reference numeral 86 in FIG. 16 denotes a support member that supports one split mold 81a so as to be able to contact and separate from the other split mold 81b. Further, the orientation direction of the long magnet molded body 3 formed by the manufacturing apparatus 87 is parallel to the contact / separation direction of the pair of split dies 81a and 81b.

  When the long magnet molded body 3 is molded by the manufacturing apparatus 87, the ejector pin 62 is projected in advance into the cavity 82 by the depth of the concave portion 3a of the long magnet molded body 3, and a pair of split magnets are formed. The molds 81a and 81b are set in a state where they are in contact with each other, that is, in a state where the molding die 81 is closed. Then, the magnet compound 80 kneaded and melted by the hopper 85 and conveyed by the runner 84 is filled into the cavity 82 by the nozzle 83. Then, the magnet compound 80 is cooled and solidified in the cavity 82 by setting a predetermined time, and the long magnet molded body 3 is formed. The molded long magnet molded body 3 moves the pair of split dies 81a and 81b to a state where they are separated from each other, that is, a state where the molding die 81 is opened, and is pushed out by the ejector pin 62 to the outside of the cavity 82. It is taken out.

  Moreover, the long magnet molded object 3 in this embodiment can also be shape | molded with the manufacturing apparatus 187 shown in FIG. The manufacturing apparatus 187 includes a pair of split molds 181 for forming a cavity 182 by having injection molds 181 detachably provided in the thickness direction of the long magnet molded body 3 and in contact with each other. It consists of molds 181a and 181b. Further, the upper surface of the one split mold 181 a facing the other split mold 181 b is formed in a shape that is the reverse of the shape of the recess 3 a of the long magnet molded body 3. Further, the orientation direction of the long magnet molded body 3 formed by the manufacturing apparatus 187 is parallel to the contact / separation direction of the pair of split molds 181a and 181b. When the long magnet molded body 3 is formed by the manufacturing apparatus 187, the ejector pin 62 is set so as to be flush with the inner surface of the other split mold 181b, and the rest is the manufacturing apparatus 87 shown in FIG. And so on. In addition, the manufacturing apparatus 187 does not necessarily have the ejector pin 62. In this case, the bottom surface of the other split mold 181b opposite to the one split mold 181a is the recess 3a of the long magnet molded body 3. It may be formed in a shape and an inverted shape, or both the bottom surface and the upper surface of one split mold 181a may be formed in an inverted shape with the shape of the concave portion 3a of the long magnet molded body 3.

  Thus, in this invention, the recessed part 3a provided so that depth may change from a center part to an edge part is along the longitudinal direction of the elongate magnet molded object 3, ie, the axial direction of the magnet roller 10. FIG. Multiple may be arranged. Although not shown in the drawings, in the present invention, the concave portion 3a provided so that the depth changes from the center portion to the end portion is the width direction of the long magnet molded body 3, that is, the axial direction of the magnet roller 10. A plurality of them may be arranged along a direction orthogonal to. Moreover, in this invention, the long magnet molded object 3 may be shape | molded by the injection molding method other than the compression molding method.

  In the first to eighth reference embodiments and the first and second embodiments described above, the concave portion 3a, the wall portion 3b, and the convex portion 3d are provided on the long magnet molded body 3 side. These may be provided on the groove 2 side, that is, on the cylindrical magnet molded body 1 side. Moreover, the recessed part 3a, the wall part 3b, and the convex part 3d may be provided in both the elongate magnet molded object 3 side and the groove part 2 side.

  FIG. 6 is an explanatory diagram of an image forming apparatus showing an embodiment of the present invention. As shown in FIG. 6, the developer carrier 20 of the present invention includes a rotatable nonmagnetic cylindrical body 11 disposed on the outer periphery of the magnet roller 10 according to any one of claims 1 to 8. is there. As the nonmagnetic cylindrical body 11, for example, aluminum, SUS (stainless steel), or the like can be used. Aluminum is often used in terms of workability and lightness. In the case of aluminum, A6063, A5056, A3003, etc., and in the case of SUS, 303, 304, 316, etc. can be used. As described above, when the rotatable nonmagnetic cylindrical body 11 is arranged on the outer periphery of the magnet roller 10 according to any one of claims 1 to 8, the developer carrier 20 capable of reducing the cost. Can be provided.

  Further, as shown in FIG. 6, the developing device 30 of the present invention has at least a developer carrier 20, a developer supply member 21, and a developer layer regulating member 22. The developing device 30 includes the developer carrier 20 according to claim 9 as the developer carrier 20. As described above, when the developer carrier 20 according to the ninth aspect is provided as the developer carrier 20, the developing device 30 capable of reducing the cost can be provided.

  Further, as shown in FIG. 6, the process cartridge 40 of the present invention includes a developer carrier 20, a developer supply member 21, a developing device 30 having at least a developer layer regulating member 22, and a charging unit. A charging roller 24 and an image carrier 25 are included. The process cartridge 40 includes the developing device 30 according to claim 10 as the developing device 30. Thus, when the developing device 30 according to the tenth aspect is provided as the developing device 30, it is possible to provide the process cartridge 40 capable of reducing the cost.

  As shown in FIG. 6, the image forming apparatus 50 of the present invention includes at least a process cartridge 40, an optical writing unit 26, a transfer member 27, and a fixing device 28. The image forming apparatus 50 includes the process cartridge 40 according to claim 11 as the process cartridge 40. As described above, when the process cartridge 40 according to the eleventh aspect is included as the process cartridge 40, the image device 50 capable of reducing the cost can be provided.

  In FIG. 6, the process cartridge 40 includes a developing device 30 having a developer carrier (developing roller) 20, a developer supply member 21, and a developer layer regulating member 22, as well as a charging roller 24 and an image carrier. 25. In FIG. 6, reference numeral 29 denotes a cleaning blade, 31 denotes a static elimination optical system, and 28 denotes a fixing device.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

It is a perspective view of the magnet roller which concerns on 1st reference embodiment used as the premise of this invention. It is a figure which shows the long magnet molded object which comprises the magnet roller shown by FIG. 1, (a) is a perspective view of a long magnet molded object, (b) was shown by (a). It is the front view seen from the arrow A direction of a long magnet molded object, (c) is sectional drawing along the B1-B1 line | wire of the long magnet molded object shown by (a). It is a conceptual explanatory drawing explaining the manufacturing method of the elongate magnet molded object shown by FIG. It is a conceptual explanatory drawing explaining the other manufacturing method of the elongate magnet molded object shown by FIG. It is a conceptual explanatory drawing explaining the further another manufacturing method of the elongate magnet molded object shown by FIG. 1 is an explanatory diagram of an image forming apparatus showing an embodiment of the present invention. It is a figure which shows the long magnet molded object which comprises the magnet roller which concerns on 2nd reference embodiment, (a) is a perspective view of a long magnet molded object, (b) is shown to (a). It is the front view seen from the arrow A direction of the made long magnet molded object, (c) is sectional drawing along the B2-B2 line | wire of the long magnet molded object shown by (a). It is a figure which shows the long magnet molded object which comprises the magnet roller which concerns on 3rd reference embodiment, (a) is a perspective view of a long magnet molded object, (b) is shown to (a). It is the front view seen from the arrow A direction of the made long magnet molded object, (c) is sectional drawing along the B3-B3 line | wire of the long magnet molded object shown by (a). It is a figure which shows the long magnet molded object which comprises the magnet roller which concerns on 4th reference embodiment, (a) is a perspective view of a long magnet molded object, (b) is shown to (a). It is the front view seen from the arrow A direction of the made long magnet molded object, (c) is sectional drawing along the B4-B4 line | wire of the long magnet molded object shown by (a). It is a figure which shows the long magnet molded object which comprises the magnet roller which concerns on 5th reference embodiment, (a) is a perspective view of a long magnet molded object, (b) is shown to (a). It is the front view seen from the arrow A direction of the made long magnet molded object, and is explanatory drawing explaining the relationship between this long magnet molded object and a cylindrical magnet molded object, (c) is (a). It is sectional drawing along the B5-B5 line | wire of the elongate magnet molded object shown by. It is a figure which shows the long magnet molded object which comprises the magnet roller which concerns on 6th reference embodiment, (a) is a perspective view of a long magnet molded object, (b) is shown to (a). It is the front view seen from the arrow A direction of the made long magnet molded object, and is explanatory drawing explaining the relationship between this long magnet molded object and a cylindrical magnet molded object, (c) is (a). It is sectional drawing along the B6-B6 line of the long magnet molded object shown by. It is a figure which shows the long magnet molded object which comprises the magnet roller which concerns on 7th reference embodiment, (a) is a perspective view of a long magnet molded object, (b) is shown to (a). It is the front view seen from the arrow A direction of the made long magnet molded object, (c) is sectional drawing along the B7-B7 line | wire of the long magnet molded object shown by (a). It is a figure which shows the long magnet molded object which comprises the magnet roller which concerns on 8th reference embodiment, (a) is a perspective view of a long magnet molded object, (b) is shown to (a). It is the front view seen from the arrow A direction of the made long magnet molded object, (c) is sectional drawing along the B8-B8 line | wire of the long magnet molded object shown by (a). It is a figure which shows the long magnet molded object which comprises the magnet roller which concerns on the 1st Embodiment of this invention, (a) is a perspective view of a long magnet molded object, (b) is (a). It is the front view seen from the arrow A direction of the long magnet molded object shown by (c), It is sectional drawing along the C1-C1 line | wire of the long magnet molded object shown by (a). (D) is sectional drawing which followed the B9-B9 line | wire of the elongate magnet molded object shown by (a). It is a figure which shows the long magnet molded object which comprises the magnet roller which concerns on the 2nd Embodiment of this invention, (a) is a perspective view of a long magnet molded object, (b) is (a). It is the front view seen from the arrow A direction of the long magnet molded object shown by (c), It is sectional drawing along the C2-C2 line | wire of the long magnet molded object shown by (a). (D) is sectional drawing which followed the B10-B10 line | wire of the elongate magnet molded object shown by (a). It is a conceptual explanatory drawing explaining the manufacturing method of the elongate magnet molded object shown by FIG. It is a conceptual explanatory drawing explaining the other manufacturing method of the elongate magnet molded object shown by FIG. It is a perspective view which shows an example of the magnet roller which has the recessed part for the conventional adhesive agent protrusion prevention to the outer periphery of a rare earth magnet.

DESCRIPTION OF SYMBOLS 1 Cylindrical magnet molding 2 Groove part 3 Long magnet molding 3a Concave part 3b Wall part 3d Convex part 5 Adhesive 10 Magnet roller 11 Nonmagnetic cylindrical body 20 Developer carrier 21 Developer supply member 22 Developer layer control member 24 Charging means 25 Image carrier 26 Optical writing means 27 Transfer member 28 Fixing device 30 Developing device 40 Process cartridge 50 Image forming device 60 Molding die 61 Cavity 62 Ejector pin 80 Magnet compound 81 Molding die

Claims (12)

At least one concave groove portion in which another member can be embedded is provided in a portion corresponding to the pole of a cylindrical magnet molded body composed of a plastic magnet containing magnetic powder, and the cylindrical magnet molded body In a magnet roller in which a long magnet molded body having a higher magnetic force than that of a plastic magnet is disposed in the groove portion via an adhesive,
A concave portion for preventing the adhesive from protruding is provided on at least one of the surfaces where the surface of the groove portion and the surface of the elongated magnet molded body are in contact with each other, and is provided so as to surround the outer periphery of the concave portion. A wall for preventing dripping of adhesive is provided, and
The depth from the surface where the surface of the groove and the surface of the elongated magnet molded body are in contact to the bottom surface of the recess is from the axial center to the axial end of the magnet roller, or from the width central to the width. A magnet roller that gradually becomes shallower in the direction.   The magnet roller according to claim 1, wherein the planar shape of the concave portion is a circle, a rectangle, or a spiral.   The magnet roller according to claim 1 or 2, wherein a plurality of the recesses are provided along an axial direction of the magnet roller and a direction orthogonal to the axial direction.   The magnet roller according to claim 1, wherein the concave portion is provided at a position where the adhesive is applied.   A convex portion provided in the concave portion and projecting from a bottom surface of the concave portion toward a surface where the surface of the groove portion and the surface of the long magnet molded body are in contact with each other; and the convex portion is the adhesive. The magnet roller according to any one of claims 1 to 4, wherein the magnet roller is provided at an application position.   The magnet roller according to claim 5, wherein a planar shape of the convex portion is a circle or a rectangle.   The said recessed part provided with two or more and the said recessed parts adjacent are penetrated and connected through the said wall part distribute | arranged between this recessed part, The any one of Claims 1-6 characterized by the above-mentioned. Magnet roller.   The depth from the surface where the surface of the said groove part and the surface of the said long magnet molded object contact | connect to the bottom face of the said recessed part is 0.01 mm or more, The any one of Claims 1-7 characterized by the above-mentioned. Magnet roller.   A developer carrier having a rotatable nonmagnetic cylindrical body on the outer periphery of the magnet roller according to claim 1.   In a developing device having at least a developer carrying member, a developer supply member, a developer layer regulating member, and a developer, the developer carrying member according to claim 9 is included as the developer carrying member. Developing device.   A process cartridge having at least a developing device, an image carrier, and a charging unit, wherein the developing device includes the developing device according to claim 10.   12. An image forming apparatus having at least a process cartridge, an optical writing unit, a transfer member, and a fixing device, wherein the process cartridge according to claim 11 is used as the process cartridge.

Images