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公开(公告)号：JP2001242696A
公开(公告)日：2001-09-07
申请号：JP2000051423
申请日：2000-02-28
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , INOUE SHU , TANAKA RYUTA
Abstract: PROBLEM TO BE SOLVED: To provide a developer carrier which is excellent in the reproducibility and the uniformity of a halftone image, whose resin layer is excellent in mechan ical and electrical durability in the case of long-term use and which can provide a stable-quality image, and to provide an image forming device to which the developer carrier is attached. SOLUTION: As for this developer carrier which is provided with a conductive elastic layer and forms a visible image by supplying developer to the surface of an image forming body while coming into contact with or coming closer to the image forming body in a state where it carries the developer on its surface and forms a developer thin film, the conductive elastic layer is formed on the outer periphery of a good conductive shaft and the resin layer whose volume resistance is 101 to 106 Ωcm is formed in >=100 μm thickness on the surface of the elastic layer. Then, the image forming device to which the developer carrier is attached is provided.
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公开(公告)号：JP2001075354A
公开(公告)日：2001-03-23
申请号：JP24985699
申请日：1999-09-03
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , MORI YUICHIRO , INOUE SHU , TANAKA RYUTA
Abstract: PROBLEM TO BE SOLVED: To improve the adhesion property of a conductive elastic base material and a resin coating layer and to prevent the cracking of the resin coating layer in long-term use by providing the surface of the conductive elastic base material with the specific resin coating layer. SOLUTION: The developer carrying member 1 is constituted by forming the conductive elastic layer 3 on the outer side of a good conductive shaft 2 or the like and further, forming the resin coating layer 4 at need on its surface. The conductive elastic layer 3 is required to satisfy the equation 0.01
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公开(公告)号：JP2001071335A
公开(公告)日：2001-03-21
申请号：JP25121699
申请日：1999-09-06
Applicant: BRIDGESTONE CORP
Inventor： INOUE SHU , TAKIZAWA YOSHIO , MORI YUICHIRO , TANAKA RYUTA
Abstract: PROBLEM TO BE SOLVED: To inject a curable liquid resin into a cylindrical mold smoothly and efficiently without generating leakage, pin holes, etc., by a relatively simple device in the production of a resin roller. SOLUTION: In an apparatus, both end parts of a core material 3 arranged in the middle of a cylindrical mold 1 are held by closing members 2 for closing both end of the mold 1. While air in the mold 1 is sucked from a vent hole 5 bored in one closing member 2, a curable liquid resin is injeted into the mold 1 from an injection hole 6 bored in the other closing member 2.
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公开(公告)号：JP2001027843A
公开(公告)日：2001-01-30
申请号：JP2000010641
申请日：2000-01-19
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , MORI YUICHIRO , INOUE SHU , TANAKA RYUTA
Abstract: PROBLEM TO BE SOLVED: To prevent the cracking of a resin coating layer in long-term use as well as to ensure superior adhesion of the resin coating layer to an electrically conductive elastic substrate. SOLUTION: A resin coating layer 4 which satisfies the expression 1
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公开(公告)号：JP2000181192A
公开(公告)日：2000-06-30
申请号：JP35609998
申请日：1998-12-15
Applicant: BRIDGESTONE CORP
Inventor： INOUE SHU , TAKIZAWA YOSHIO , HARASHIMA HIROSHI , MORI YUICHIRO , TANAKA RYUTA
Abstract: PROBLEM TO BE SOLVED: To provide a conductive member that applies a voltage or energizes a current, thereby applying a specific polarity to a body to be electrified, lowers the dependence of electrical resistance on environment and the dependence of it on voltage and reduces positional variation in electrical resistance. SOLUTION: A conductive member is a member that has conductive layers and applies a voltage or energizes a current, thereby applying a specific polarity to a body to be electrified. The conductive layers are a lamination of electric conductive layers 3, each containing electric conductive agent in the surface of a conductive thin film 2 having a thickness of equal to or smaller than 1 mm which contains an ion conductive agent.
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Patent Agency Ranking
公开(公告)号：JPH11128834A
公开(公告)日：1999-05-18
申请号：JP31447497
申请日：1997-10-30
Applicant: BRIDGESTONE CORP
Inventor： TAKAGI MITSUHARU , TAKIZAWA YOSHIO , OKADA TOKUO , ARAI TOSHIAKI , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To enhance the compatibility of resin mixtures with each other and to obtain the uniform resin mixtures by using coupling agents as dispersion assistants at the time of uniformly dispersing silicone resins into another resins. SOLUTION: The coupling agents of a silane system, titanate system, aluminum system, zirconium system, zirconiumaluminate system, etc., are used as the dispersion assistants at the time of uniformly dispersing the silicone resins, such as silicone oil, silicone resins, silicone rubber and their denatured substances, into the polyimide resins, acryl urethane resins, alkyd resins, phenolic resins, melamine resins or their mixtures. The amt. of the coupling agents to be added is specified 0.5 to 3 pts.wt. per 100 pts.wt. total resin weight. As a result, the compatibility of the resins mixtures with each other is increased and the uniform resin mixtures may be obtd.
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37.发明专利
公开(公告)号：JPH1145001A
公开(公告)日：1999-02-16
申请号：JP23183297
申请日：1997-08-13
Applicant: BRIDGESTONE CORP
Inventor： TAKAGI MITSUHARU , TAKIZAWA YOSHIO , SAWA EIJI , AOKI SHIGERU , OFUKU EIJI , TAKEBE KOTARO , GOTO YASUHEI
Abstract: PROBLEM TO BE SOLVED: To obtain an excellent image. SOLUTION: This magnet roller in which a magnet main body part and a shaft part are integrally molded is molded with a bond magnet composition mixed with Sr ferrite having the Sr/Ba ratio of 1-100. The difference between the magnetic poles having maximum and minimum magnetic forces of the magnet roller is defined as >=100 G. At the time of executing molding, the magnet main body part is thrust by an ejecting pin to be removed from a mold. A gate is provided in a metallic mold, so as to correspond to the outer periphery or end face part of the magnet main body part or the outer peripheral part of the shaft part and the bond magnet composition is injected through the gate. This developing roller is composed of the magnet roller or roller obtained by this method. and a sleeve.
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公开(公告)号：JPH1144993A
公开(公告)日：1999-02-16
申请号：JP20147197
申请日：1997-07-28
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , TAKAGI MITSUHARU , OKADA TOKUO , ARAI TOSHIAKI , KAWAGOE TAKAHIRO , KITAMURA TAKASHI
Abstract: PROBLEM TO BE SOLVED: To obtain a toner carrier capable of forming a high-quality image where a black horizontal line or a white horizontal line is not caused, that is, which has no irregularity by incorporating a crosslinked resin on the surface of a conductive elastic layer and forming a surface layer whose solvent insolubility rate to a specified resin component is equal to or above a specified value. SOLUTION: As for this toner carrier 1, the surface layer 4 principally incorporating a crosslinked resin is provided on the surface of the conductive elastic layer 3 in order to control electrifying property and adhesive property for toner or in order to prevent the decrease of frictional force between a photoreceptor and a laminated blade and the soiling of the photoreceptor by an elastic body. The solvent insolubility rate of the resin component of the surface layer 4, which is expressed by solvent insolubility rate (%)=(B/A)×100, in >=70%, provided that A shows the weight of the resin component in the surface layer 4 before it is immersed in the solvent and B shows the weight of the resin component in the surface layer 4 after it is immersed in good solvent for 24 hours at 25 deg.C to the resin component before cross-linking treatment.
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公开(公告)号：JPH09269652A
公开(公告)日：1997-10-14
申请号：JP10431096
申请日：1996-03-29
Applicant: BRIDGESTONE CORP
Inventor： TAKAGI MITSUHARU , TAKIZAWA YOSHIO , HASHIMOTO MARI , KAGA NORIHIKO , HARASHIMA HIROSHI , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To provide a developing roller furnished with the sufficient elasticity with a low hardness as the whole roller, and excellent wear resistance and hard to have a flaw on the surface, not giving damage to opposite member in contact such as a photosensitive drum, moreover not causing inconvenience due to toner sticking, excellent in releasing the toner, and surely performing the excellent and stable development over a long period. SOLUTION: As for the developing roller 1, composed by forming an elastic layer 3 consisting of polyurethane provided with conductivity on an outer periphery of a conductive shaft 2, and forming a thin layer of the developer by carrying the developer on the surface, for making an electrostatic latent image visualizable, by feeding the developer on the electrostatic latent image, coming in the state of the above, into contact with or close to the latent image carrier carrying the electrostatic latent image on the surface, a surface skin layer 4 of 1 to 50μm thickness consisting essentially of the phenol resin is formed on the elastic layer 3.
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公开(公告)号：JPH09171299A
公开(公告)日：1997-06-30
申请号：JP25777896
申请日：1996-09-06
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , TAKAGI MITSUHARU , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To provide a low-hardness developing roller provided with an excellent contact property and constituted so that a photoreceptor or the like is not stained, a high-quality image without density irregularity or surface fogging is obtained and image quality is not deteriorated even when it is used for a long term. SOLUTION: The developing roller 1 is obtained by forming an electrical conductive elastic layer 3 on the outside circumference of a good electrical conductive shaft 2. Then, developer is carried by the surface of the layer 3 so as to form the thin Layer of the developer. In such a state, the roller 1 is brought into contact with a latent image holding body holding an electrostatic latent image on the surface or it approaches the latent image holding body so as to visualize the latent image by supplying the developer to the surface of the latent image holding body. In such a case, the surface of the layer 3 is provided with a resin component including urea resin and/or melamine resin. Besides, when the resistance of the roller which is not provided with the resin component is defined as R1 and the resistance of the roller provided with the resin component is defined as R2 , the relation of log (R2 /R1 )
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