WO2005119374A1 - マグネットローラ - Google Patents
マグネットローラ Download PDFInfo
- Publication number
- WO2005119374A1 WO2005119374A1 PCT/JP2005/009321 JP2005009321W WO2005119374A1 WO 2005119374 A1 WO2005119374 A1 WO 2005119374A1 JP 2005009321 W JP2005009321 W JP 2005009321W WO 2005119374 A1 WO2005119374 A1 WO 2005119374A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pole
- magnet
- magnetic
- magnet piece
- flux density
- Prior art date
Links
- 239000006249 magnetic particle Substances 0.000 claims abstract description 38
- 238000001125 extrusion Methods 0.000 claims abstract description 22
- 238000001746 injection moulding Methods 0.000 claims abstract description 16
- 229920005989 resin Polymers 0.000 claims description 44
- 239000011347 resin Substances 0.000 claims description 44
- 239000011230 binding agent Substances 0.000 claims description 21
- QLZJUIZVJLSNDD-UHFFFAOYSA-N 2-(2-methylidenebutanoyloxy)ethyl 2-methylidenebutanoate Chemical compound CCC(=C)C(=O)OCCOC(=O)C(=C)CC QLZJUIZVJLSNDD-UHFFFAOYSA-N 0.000 claims description 9
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 claims description 9
- 239000005042 ethylene-ethyl acrylate Substances 0.000 claims description 9
- 229920006122 polyamide resin Polymers 0.000 claims description 6
- 230000004907 flux Effects 0.000 abstract description 66
- 239000006247 magnetic powder Substances 0.000 description 34
- 230000000052 comparative effect Effects 0.000 description 21
- 239000000463 material Substances 0.000 description 19
- 238000000465 moulding Methods 0.000 description 16
- 229910000859 α-Fe Inorganic materials 0.000 description 15
- 238000002347 injection Methods 0.000 description 10
- 239000007924 injection Substances 0.000 description 10
- 239000000314 lubricant Substances 0.000 description 9
- 238000005259 measurement Methods 0.000 description 9
- 239000008188 pellet Substances 0.000 description 9
- 239000003381 stabilizer Substances 0.000 description 9
- 229910052712 strontium Inorganic materials 0.000 description 8
- 235000012438 extruded product Nutrition 0.000 description 7
- -1 for example Polymers 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 239000004709 Chlorinated polyethylene Substances 0.000 description 6
- 229920001577 copolymer Polymers 0.000 description 6
- 230000005415 magnetization Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000004014 plasticizer Substances 0.000 description 6
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 6
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 5
- 239000005977 Ethylene Substances 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 4
- 229920001707 polybutylene terephthalate Polymers 0.000 description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 description 4
- 239000005020 polyethylene terephthalate Substances 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 150000002910 rare earth metals Chemical class 0.000 description 4
- 229920000219 Ethylene vinyl alcohol Polymers 0.000 description 3
- 239000004793 Polystyrene Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 239000005038 ethylene vinyl acetate Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- 229920002223 polystyrene Polymers 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 239000007822 coupling agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003822 epoxy resin Substances 0.000 description 2
- UFRKOOWSQGXVKV-UHFFFAOYSA-N ethene;ethenol Chemical compound C=C.OC=C UFRKOOWSQGXVKV-UHFFFAOYSA-N 0.000 description 2
- 239000004715 ethylene vinyl alcohol Substances 0.000 description 2
- 239000003063 flame retardant Substances 0.000 description 2
- 239000007849 furan resin Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 239000005011 phenolic resin Substances 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001721 polyimide Polymers 0.000 description 2
- 239000009719 polyimide resin Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910000077 silane Inorganic materials 0.000 description 2
- 229920005992 thermoplastic resin Polymers 0.000 description 2
- 229920006337 unsaturated polyester resin Polymers 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 210000003323 beak Anatomy 0.000 description 1
- LRHPLDYGYMQRHN-UHFFFAOYSA-N butyl alcohol Substances CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 235000019441 ethanol Nutrition 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- HDNHWROHHSBKJG-UHFFFAOYSA-N formaldehyde;furan-2-ylmethanol Chemical compound O=C.OCC1=CC=CO1 HDNHWROHHSBKJG-UHFFFAOYSA-N 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 229920005990 polystyrene resin Polymers 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/10—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
- H01F1/11—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
- H01F1/113—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0231—Magnetic circuits with PM for power or force generation
- H01F7/0252—PM holding devices
- H01F7/0268—Magnetic cylinders
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0273—Imparting anisotropy
- H01F41/028—Radial anisotropy
Definitions
- the present invention relates to a magnet roller incorporated in an image forming apparatus such as a copying machine, a printer, a facsimile, and the like.
- a magnet roller incorporated in an image forming apparatus using a powder toner in a copier, a printer, a facsimile, or the like is generally configured as follows.
- a magnet roller is formed by fixing a plurality of magnet pieces obtained by orienting a magnetic easy axis in a specific direction at the same time as extrusion molding to a shaft (Patent Document 1).
- a sectional shape is a sector, and a central force of an arc is formed.
- a magnet piece is magnetized by orienting the axis of easy orientation of the flour powder to the other three sides and magnetized. They are combined to form a magnet roller (Patent Document 2).
- Patent Document 1 JP-A-59-143171
- Patent Document 2 Japanese Patent Application Laid-Open No. 62-282423
- each magnetic piece corresponding to the magnetic pole position has magnetic particles oriented in a direction parallel to a radial center line, and a magnet piece between the magnetic poles.
- the radial center line is a line extending in the circumferential direction from the center point of the magnet roller, and the line passes through a point that bisects the outer circumferential arc of the magnet piece.
- the magnetic particles are oriented in the vertical direction. In other words, the orientation of the magnetic particles of the magnet piece is parallel to the radial center line or perpendicular to the radial center line (that is, in the direction perpendicular to the joint surface when viewed from the joint surface with the adjacent magnet piece).
- the magnetic particles are oriented in parallel to the magnetic particles), and the orientation of the magnetic particles is inclined with respect to the parallel line and the vertical line.
- only a simple magnetic flux density pattern may be formed. In this patent, eight magnet pieces are used to obtain four magnetic poles, which may be costly.
- Patent Document 2 after injection molding a magnet piece having a fan-shaped cross section and magnetizing the ferrite powder from the center of the arc to the other three sides by orienting the easy axis of ferrite powder.
- a magnet roller is formed by bonding a plurality of shafts to a shaft, it is difficult to form a complicated magnetic flux density pattern, but only a simple magnetic flux density pattern can be formed. is there.
- the magnet roller of the present invention is characterized in that the magnetic particles are formed by extremely anisotropic orientation molding of magnetic particles by injection molding, and the magnetic particles are inclined by 5 ° or more with respect to the radial center line of the magnet piece by extrusion molding.
- the magnet roller of the present invention by using an ethylene ethyl acrylate resin as a binder resin for an extruded magnet piece, a magnet piece with good dimensional accuracy can be obtained, and a moderately acceptable magnetic roller can be obtained. It has flexibility and eliminates the risk of warpage. Also, the degree of freedom of the magnetic flux density pattern of the magnet piece is improved, and a complex magnetic flux density pattern is possible.
- a magnet resin having good dimensional accuracy can be obtained by using a polyamide resin as a binder resin for a magnet piece that is injection-molded. And a magnetic pole having a high magnetic flux density becomes possible.
- the magnet roller of the present invention can provide a magnet piece with good dimensional accuracy by using an ethylene ethyl acrylate resin as a binder resin for the injection-molded magnet piece. It has flexibility and eliminates the risk of warpage. Also, the magnetic flux density strength of the magnet piece is improved, and a magnetic pole with a high magnetic flux density becomes possible.
- a magnet piece formed by extrusion molding has good dimensional accuracy, and even when the magnet pieces are bonded together, the magnetic pole position accuracy is good, and the adhesive strength is improved. Stabilize.
- a magnet piece formed by injection molding has a high magnetic flux density and good developer capri- bility.
- the magnet piece formed by injection molding has a high magnetic flux density and is flexible, so there is no need to worry about warpage, and the adhesive strength is improved and stabilized.
- FIG. 1 is a diagram of a magnetic piece bonded to the present invention and a magnetic flux density pattern
- FIG. 7 is a perspective view of a magnet roller of the present invention.
- the present invention provides a magnet piece in which magnetic particles are extremely anisotropically oriented by injection molding, and a magnetic particle inclined by 5 ° or more with respect to the radial center line of the magnet piece by extrusion molding.
- a magnet roller characterized by being formed by combining with a magnet piece which is oriented and formed.
- a conventional magnet roller is a device in which a plurality of extruded magnet pieces are bonded around a shaft.
- the orientation of magnetic particles of the magnet pieces is centered in the radial direction.
- the magnet pieces between the magnetic poles are oriented in a direction perpendicular to the radial center line.
- the magnetic particles of the N1 pole magnet piece are oriented so as to converge to a part of the outer peripheral surface of the side surface and the bottom surface force (hereinafter referred to as extremely anisotropic orientation).
- the N1 pole magnet piece 1 is a mold having a magnetic circuit as shown in FIG. 2, and a molten resin magnet is injected from an inlet through an electromagnet or a permanent magnet to an orientation magnetizing magnet. yoke 11 by 240K ⁇ AZn! Injection is performed while applying a magnetic field of 22400 ⁇ AZm, and the magnetic particles are oriented and magnetized in a desired direction and cured to obtain the N1 pole magnet piece. Since the obtained magnet piece is molded in a mold by injection molding, its dimensional accuracy is better than that of an extruded product. Post-processing such as high-precision cutting in the vertical direction is not required, and a low-cost, high-dimensional-accuracy magnet piece can be obtained. In addition, in the case of injection molding, since the melt viscosity of the molten resin magnet is much lower than that of extrusion molding or the like, the degree of orientation of the magnetic particles is improved, and a magnet piece with high magnetic properties can be obtained.
- the magnet piece is mainly composed of a mixture consisting of 50% by weight to 95% by weight of anisotropic ferrite magnetic powder and 5% by weight to 50% by weight of a resin binder.
- Additives such as silane-based or titanate-based coupling agents, and polystyrene-based fluorinated lubricants that improve fluidity, stabilizers, plasticizers, or flame retardants, are mixed and dispersed, and melt-kneaded. After molding into a pellet, injection molding is performed.
- the orientation magnetizing magnetic field applied at the time of molding may be appropriately selected depending on the magnetic flux density specification required for each magnetic pole. Depending on the required magnetic characteristics, the magnetizing may be performed after the molding without applying the orientation magnetizing magnetic field during the molding.
- the magnetic powder a different material having a chemical formula represented by MO'nFeO (n is a natural number) is used.
- Examples include isotropic ferrite magnetic powder.
- M in the formula one or more of Sr, Ba, lead and the like are appropriately selected and used.
- the resin binder if it is a thermoplastic resin, for example, vinyl chloride-butyl acetate copolymer, ethylene ethyl acrylate resin, polyamide resin, polystyrene, PET (polyethylene terephthalate) , PBT (polybutylene terephthalate), PPS (polyethylene sulfide), EVA (ethylene vinyl acetate copolymer) EVOH (ethylene vinyl alcohol copolymer), CPE (chlorinated polyethylene) and PVC (polychlorinated vinyl) ) And the like, epoxy resins, phenol resins, urea resins, unsaturated polyester resins, melamine resins, furan resins, and polyimide resins. These may be used alone or in combination of two or more.
- a thermoplastic resin for example, vinyl chloride-butyl acetate copolymer, ethylene ethyl acrylate resin, polyamide resin, polystyrene, PET (polyethylene ter
- anisotropic ferrite magnetic powder and isotropic ferrite are used as the magnetic powder. It is also possible to use light magnetic powder, anisotropic rare earth magnetic powder (for example, SmFeN type), or isotropic rare earth magnetic powder (for example, NeFeB type) alone or as a mixture of two or more.
- anisotropic rare earth magnetic powder for example, SmFeN type
- isotropic rare earth magnetic powder for example, NeFeB type
- the content of the single magnetic powder or the mixed magnetic powder shown above is less than 50% by weight, the magnetic properties of the magnet pieces are reduced due to the shortage of the magnetic powder, and it becomes difficult to obtain a desired magnetic force. If it exceeds 95% by weight, the binder may be insufficient and the moldability may be impaired.
- the magnet pieces of the N2 pole and the N3 pole are formed by an electromagnet or a permanent magnet using an extrusion die (die) having a magnetic circuit as shown in FIGS. 240K ⁇ ⁇ !
- die extrusion die
- the orientation magnetizing yoke placed in the mold. While applying a magnetic field of ⁇ 2400 ⁇ ⁇ AZm, the magnetic particles were oriented and magnetized simultaneously with the extrusion to obtain the N2 pole and N3 pole magnet pieces shown in Fig. 1.
- a magnetic field in one direction is applied using a mold (die) as shown in FIG. 3 to orient the magnetic particles of the molten resin magnet passing through the mold.
- a mold die
- the mold is also very inexpensive as compared with the injection mold, and the mold adjustment is easy.
- the shape of the undercut of the magnet piece is cut out to improve the above-mentioned take-out property, the magnetic properties are adversely affected, the magnetic flux density strength is reduced, and the magnetic flux density pattern is deformed. Magnetic flux density strength and no-turn may not be obtained.
- the extruded product magnet piece is moderately flexible and can be easily attached to a shaft that is less likely to warp or crack than an injection-molded product magnet piece.
- the magnet piece is mainly composed of a mixture of 50% to 95% by weight of the anisotropic ferrite magnetic powder and 5% to 50% by weight of the resin binder, and if necessary, surface treatment.
- the orientation magnetizing magnetic field applied at the time of molding may be appropriately selected according to the magnetic flux density specification required for each magnetic pole. Depending on the required magnetic characteristics, the magnetizing may be performed after the molding without applying the orientation magnetizing magnetic field during the molding.
- MO'nFeO an MO having a chemical formula represented by MO'nFeO (n is a natural number) is used.
- Examples include isotropic ferrite magnetic powder.
- M in the formula one or more of Sr, Ba, lead and the like are appropriately selected and used.
- the resin binder if it is a thermoplastic resin, for example, salted butyric-butyl acetate copolymer, ethylene ethyl acrylate resin, polyamide resin, polystyrene resin, PET ( Polyethylene terephthalate), PBT (polybutylene terephthalate), PPS (polyphenylene sulfide), EVA (ethylene butyl acetate copolymer) EVOH (ethylene butyl alcohol copolymer), CPE (chlorinated polyethylene) and PVC (polyethylene)
- the thermosetting resin such as a salted vinyl resin, include epoxy resin, phenol resin, urea resin, unsaturated polyester resin, melamine resin, furan resin, and polyimide resin. These may be used alone or in combination of two or more.
- anisotropic ferrite magnetic powder isotropic fly magnetic powder, anisotropic rare earth magnetic powder (for example, SmFeN type), and isotropic rare earth magnetic powder (for example, NeFeB type) ) May be used alone or in combination of two or more.
- anisotropic ferrite magnetic powder for example, SmFeN type
- anisotropic rare earth magnetic powder for example, NeFeB type
- the content of the single magnetic powder or the mixed magnetic powder shown above is less than 50% by weight, the magnetic properties of the magnet pieces are reduced due to the shortage of the magnetic powder, and it becomes difficult to obtain a desired magnetic force. If it exceeds 95% by weight, the binder may be insufficient and the moldability may be impaired.
- Extrusion molding is a method of using a mold (die) as shown in Fig. 4 and applying a magnetic field in one direction (constant direction) to orient the magnetic particles of the molten resin magnet passing through the mold.
- a magnetic field is applied in parallel to the center line of the magnet piece in the radial direction, and the magnetic particles of the magnet piece are oriented and oriented.
- the mold is very cheap compared to the injection mold, and the mold adjustment is easy.
- the extruded product magnet piece has an appropriate flexibility, and is easier to bond to a shaft which is less likely to be warped or cracked than an injection-molded product magnet piece.
- the compounding and prescription of the materials of the S1 pole and S2 pole magnet pieces are exactly the same as the N2 pole and N3 pole of the extruded product.
- the N1 pole achieves a high magnetic force of 105mT, and the N2 pole and N3 pole have a magnetic flux density peak.
- An asymmetric magnetic flux density pattern can be obtained with respect to the position, and the developer transportability, the passage of the developer regulating blade, and the peelability of the developer are improved, and good image quality may be obtained.
- the dimensional accuracy of the extruded product is improved by changing the resin of the resin magnet material of the magnet piece to ethylene ethyl acrylate resin, thereby improving the dimensional accuracy of the extruded product. It is softer than injection-molded products and harder than extruded products of soft PVC-based resin magnets, has semi-rigid hardness, and has good brittleness, stickiness, and elasticity.
- the magnetic properties are improved, and the dimensional accuracy of the injection molded product is improved.
- the rigidity reduces the axial twist of the magnet piece when affixed to the shaft. Further, by obtaining a high magnetic flux density, developer fog can be reduced or prevented in some cases.
- the magnetic properties are improved and the dimensional accuracy of the injection-molded article is improved by changing the binder resin of the resin magnet material of the magnet piece to an ethylene ethyl acrylate resin.
- Improved and had a semi-rigid hardness Therefore, it is easy to attach to a shaft that is free from warpage and cracks.
- developer fog can be reduced or prevented in some cases.
- magnet pieces used in the present invention do not all need to be made of the same material (binder, magnetic powder, etc.), different kinds of magnet pieces can be arbitrarily combined to match the magnetic characteristics and achieve low cost. Good.
- a force illustrating a magnet roll having a five-pole configuration is not limited to only a five-pole magnet roll.
- the number of magnet pieces may be selected according to the desired magnetic flux density and magnetic field distribution, and the number of magnetic poles and the position of the magnetic poles may be set as appropriate.
- the magnetic material may be demagnetized in the mold or outside the mold after molding, and then magnetized. .
- magnet piece material for the N1 pole in Fig. 1 10% by weight of nylon 6 (P1010 manufactured by Ube Industries, Ltd.) (including lubricants, plasticizers, and stabilizers) was used as a resin binder, and anisotropic stoichiometry was used as magnetic powder.
- nylon 6 P1010 manufactured by Ube Industries, Ltd.
- anisotropic stoichiometry was used as magnetic powder.
- a molten resin magnet material is injected and injected, and the molten metal is applied while applying a magnetic field of 1200 K'AZm.
- the magnetic particles of the fat magnet were magnetized in a very anisotropic orientation, and the magnet piece N1 shown in Fig. 1 was injection molded.
- chlorinated polyethylene Showa Denko Ebaslen 410P
- 10% by weight (including lubricants, plasticizers, and stabilizers) of a danibul-butyl acetate copolymer manufactured by Kaneka Chemical Co., Ltd., MB1008
- anisotropic strontium fly magnetic powder SrO '6FeO
- the outer diameter of the magnet roller body was ⁇ 13.6, the length of the magnet body was 320 mm, and the outer diameter of the shaft was ⁇ 6 (material SUM22).
- Tables 1 to 3 show the measurement results.
- the 80% half width in Table 1 is the line connecting the magnet roller center 13 to the magnetic flux density peak position 14 and the line connecting the magnetic flux density peak value at 80% position ( + 3+ ⁇ 4) Sorted by the intersection with) 3 (80% half body width on the S1 side) and 0 4 (80% half body width on the S2 side).
- ⁇ 5 S1 side 50% half body width
- ⁇ 5 distributed at the intersection of the line 14 connecting the center 13 to the magnetic flux density peak position and the line ( ⁇ 5+ ⁇ 6) connecting the position of 50% of the magnetic flux density peak value
- 0 6 S2 side 80% half width
- the obtained magnet piece was placed on a surface plate, and the pick tester was scanned in the axial direction of the magnet piece, and the difference between the maximum value and the minimum value was defined as the amount of warpage. Furthermore, the appearance of the magnet piece was visually observed to check for cracks.
- Extrusion magnet material (S1 pole, N2 pole, N3 pole, S2 pole) as, ethylene E chill Atari rate ⁇ binder (Japan Interview - Car made PES - 210) 10 wt 0/0 (lubricants, stabilizers 90% anisotropic strontium ferrite magnetic powder (SrO'6FeO) %, And they are mixed, melt-kneaded and formed into pellets. The pellets are melted, and the dies (dies) shown in FIGS. 3A and 3B and FIGS. 4A and 4B are used. 240 ⁇ ⁇ ⁇ ! The procedure was the same as in Example 1 except that the magnetic particles of the molten resin magnet were oriented and magnetized in one direction for each piece while applying a magnetic field of ⁇ 2400 K'AZm, and extruded.
- Tables 1 to 4 show the measurement results.
- Nylon 12 (P3012U manufactured by Ube Industries, Ltd.) as a resin binder, 10% by weight (including lubricant, plasticizer and stabilizer) as a magnetic material for injection molding (N1 pole), and anisotropic strontium as magnetic powder Same as Example 1 except that the ferrite magnetic powder (SrO'6FeO) was 90% by weight.
- Tables 1 to 4 show the measurement results.
- Tables 1 to 4 show the measurement results.
- a magnet piece oriented extremely anisotropically is molded using the same material and molding method as in Example 1, and for the poles other than the N1 pole (S1, P2, N3, and S2) Also, the same material as the N1 pole of Example 1 was used as the magnet piece material, and the molding was performed using a mold having a magnetic circuit as shown in FIGS. 5a, b, c, and d.
- the magnetic particles of the molten resin magnet were oriented and magnetized in one direction for each piece while applying a magnetic field of 22400 ⁇ AZm, and a magnet piece was obtained by injection molding. Therefore, the N2 and N3 poles are also oriented and magnetized parallel to the radial center line of the magnet piece using the mold shown in Fig. 5, and injection molded. did.
- the magnetic particles of the molten resin magnet were oriented and magnetized in one direction for each piece and extruded.
- the N2 pole and the N3 pole are inclined at 20 ° for the N2 pole and 25 ° for the N3 pole with respect to the radial center line of the magnet piece.
- Tables 1 to 4 show the measurement results.
- the magnetic flux density patterns of the N2 pole and N3 pole of No. 4 are asymmetrical patterns with respect to the magnetic flux density peak, but the magnetic flux density patterns of the N2 pole and N3 pole of Comparative Examples 1 and 2 are symmetric with respect to the magnetic flux density peak. Pattern. It can be seen that this is achieved by inclining the magnetic particles of the magnetic pieces of the N2 pole and N3 pole magnet pieces in Example 1 with respect to the radial center line of the magnet pieces. In other words, by inclining and orienting the magnetic particles of the magnet piece like the N2 pole and N3 pole described above, an asymmetric magnetic flux density pattern can be obtained with respect to the magnetic flux density peak, and a complex magnetic flux density pattern becomes possible. I understand.
- the asymmetric magnetic flux density pattern improves the transportability of the developer, the passage property of the developer regulating blade, the releasability of the developer, and the like, and may provide good image quality.
- Comparing Example 3 with Comparative Example 2 as can be seen from Table 3, the magnetic flux density intensity of the N1 pole (developing electrode) of Example 3 was 106 mT, whereas the magnetic flux density strength of Comparative Example 2 was 106 mT. It is 95mT. This is because by using polyamide resin for the resin binder as the N1 pole (for injection) magnet piece material, the magnetic particles of the magnet piece are extremely anisotropically oriented, resulting in a long magnetic path. Therefore, it can be seen that the magnetic flux density strength is improved. High magnetic flux density may reduce or prevent developer fog.
- Example 4 When Example 4 is compared with Comparative Example 1, as shown in Table 3, the N1 pole of Example 4 has a high magnetic flux density (104 mT). In addition, each piece of Example 4 has no warp and no cracks, whereas the N1 pole of Comparative Example 1 has a high magnetic flux density (104 mT) and a certain force. Each piece has a warp of 0.18 mm to 0.23 mm. It can also be seen that cracks have occurred at the N1, S1, and N3 poles. This indicates that when an ethylene ethyl alcohol-based resin binder is used for the magnet piece as in Example 4, flexibility is exhibited, no warpage occurs, and no crack occurs.
- the adhesiveness with the shaft and the adjacent magnet piece is improved, and the adhesive strength is increased.
- High magnetic flux density may reduce or prevent developer fog. Cracks locally cause a sharp decrease in magnetic flux density, and may cause white stripes or the like in an image. Preventing cracks may provide good image quality.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Magnetic Brush Developing In Electrophotography (AREA)
- Electrophotography Configuration And Component (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US11/569,997 US20080246572A1 (en) | 2004-06-04 | 2005-05-23 | Magnet Roller |
JP2006514066A JPWO2005119374A1 (ja) | 2004-06-04 | 2005-05-23 | マグネットローラ |
Applications Claiming Priority (2)
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JP2004-167000 | 2004-06-04 | ||
JP2004167000 | 2004-06-04 |
Publications (1)
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WO2005119374A1 true WO2005119374A1 (ja) | 2005-12-15 |
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ID=35463043
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PCT/JP2005/009321 WO2005119374A1 (ja) | 2004-06-04 | 2005-05-23 | マグネットローラ |
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US (1) | US20080246572A1 (ja) |
JP (1) | JPWO2005119374A1 (ja) |
CN (1) | CN1981247A (ja) |
WO (1) | WO2005119374A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101226365A (zh) * | 2007-01-11 | 2008-07-23 | 株式会社理光 | 磁性辊及其制造方法、显影剂盒、显影装置、处理盒和图像形成设备 |
US8500615B2 (en) | 2007-01-11 | 2013-08-06 | Ricoh Company, Ltd. | Magnetic roller and manufacturing method thereof, developer carrier, development device, processing cartridge, and image forming apparatus |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015146043A1 (ja) * | 2014-03-24 | 2015-10-01 | パナソニックIpマネジメント株式会社 | 磁気センサ |
US10094890B2 (en) * | 2014-10-09 | 2018-10-09 | Panasonic Intellectual Property Management Co., Ltd. | Magnetic sensor |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0864447A (ja) * | 1994-08-26 | 1996-03-08 | Kanegafuchi Chem Ind Co Ltd | マグネットロールの押出成形金型及び当該押出成形金型を用いたマグネットロールの製造方法 |
JP2002091166A (ja) * | 2000-09-11 | 2002-03-27 | Kanegafuchi Chem Ind Co Ltd | マグネットローラ |
JP2002151324A (ja) * | 2000-11-16 | 2002-05-24 | Kanegafuchi Chem Ind Co Ltd | マグネットローラ |
JP2003086421A (ja) * | 2001-09-12 | 2003-03-20 | Kanegafuchi Chem Ind Co Ltd | マグネットローラ |
JP2003151825A (ja) * | 2001-11-12 | 2003-05-23 | Kanegafuchi Chem Ind Co Ltd | マグネットローラ |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4557582A (en) * | 1982-04-02 | 1985-12-10 | Canon Kabushiki Kaisha | Magnet roll |
JP2759527B2 (ja) * | 1989-11-22 | 1998-05-28 | 鐘淵化学工業株式会社 | 電子写真現像法 |
US6021296A (en) * | 1997-03-06 | 2000-02-01 | Bridgestone Corporation | Magnet roller and manufacturing method thereof |
JP2001100531A (ja) * | 1999-09-29 | 2001-04-13 | Nec Niigata Ltd | 電子写真用現像装置 |
JP2001135518A (ja) * | 1999-11-10 | 2001-05-18 | Kanegafuchi Chem Ind Co Ltd | マグネットローラ |
-
2005
- 2005-05-23 CN CNA2005800178215A patent/CN1981247A/zh active Pending
- 2005-05-23 US US11/569,997 patent/US20080246572A1/en not_active Abandoned
- 2005-05-23 JP JP2006514066A patent/JPWO2005119374A1/ja active Pending
- 2005-05-23 WO PCT/JP2005/009321 patent/WO2005119374A1/ja active Application Filing
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0864447A (ja) * | 1994-08-26 | 1996-03-08 | Kanegafuchi Chem Ind Co Ltd | マグネットロールの押出成形金型及び当該押出成形金型を用いたマグネットロールの製造方法 |
JP2002091166A (ja) * | 2000-09-11 | 2002-03-27 | Kanegafuchi Chem Ind Co Ltd | マグネットローラ |
JP2002151324A (ja) * | 2000-11-16 | 2002-05-24 | Kanegafuchi Chem Ind Co Ltd | マグネットローラ |
JP2003086421A (ja) * | 2001-09-12 | 2003-03-20 | Kanegafuchi Chem Ind Co Ltd | マグネットローラ |
JP2003151825A (ja) * | 2001-11-12 | 2003-05-23 | Kanegafuchi Chem Ind Co Ltd | マグネットローラ |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101226365A (zh) * | 2007-01-11 | 2008-07-23 | 株式会社理光 | 磁性辊及其制造方法、显影剂盒、显影装置、处理盒和图像形成设备 |
US8500615B2 (en) | 2007-01-11 | 2013-08-06 | Ricoh Company, Ltd. | Magnetic roller and manufacturing method thereof, developer carrier, development device, processing cartridge, and image forming apparatus |
Also Published As
Publication number | Publication date |
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JPWO2005119374A1 (ja) | 2008-04-03 |
CN1981247A (zh) | 2007-06-13 |
US20080246572A1 (en) | 2008-10-09 |
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