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公开(公告)号：JPH08286470A
公开(公告)日：1996-11-01
申请号：JP9247395
申请日：1995-04-18
Applicant: BRIDGESTONE CORP
Inventor： TAKAGI MITSUHARU , TAKIZAWA YOSHIO , MIYAMOTO TARO , MASUDA YOSHITOMO , KANEDA HIROSHI , KAWAGOE TAKAHIRO
Abstract: PURPOSE: To obtain a stable image of high quality by using a polymer material containing a conductive powder as a conductive member and moveover, dispersing silica fine particles in the polymer material. CONSTITUTION: The developer roller 1 consists of a shaft 2 of a good conductive material such as a metal and an elastic layer 3 (conductive member) of an elastic material to which conductivity is imparted. The conductive member 3 consists of a polymer material containing a conductive powder, and further, silica fine particles are dispersed in the polymer material. For example, an elastomer or formed material such as polyurethane and EPDM is used as the base material, and a conductive powder such as carbon black, metal or metal oxide is added to the base material to control the conductivity to a medium resistance region which is the optimum for the use. Further, by using positive charge silica having amino groups on the surface as the silica particles, the resistance can be more stably controlled.
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公开(公告)号：JPH08101580A
公开(公告)日：1996-04-16
申请号：JP31114294
申请日：1994-11-21
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , TAKAGI MITSUHARU , KANEDA HIROSHI , NIWA HIDEYUKI , MIYAMOTO TARO , YAKUSHIJI MANABU , KAWAGOE TAKAHIRO
IPC: G03G15/08
Abstract: PURPOSE: To prevent a failure such as the contamination of a photoreceptor, to obtain a high-quality image without uneven density and surface fogging and to prevent image quality from being deteriorated even in long-term use. CONSTITUTION: This developing roller 1 is constituted by forming an elastic layer 3 having conductivity on the outer periphery of a good conductive shaft 2, and it visualizes an electrostatic latent image by carrying non-magnetic one- component developer on the surface of the elastic layer 3, forming the thin layer of the developer, and coming in contact with a latent image holding body holding the electrostatic latent image on its surface in such a state. The elastic layer 3 has a resin component which is non-contaminative to the latent image holding body and does not contain conductive powder on its surface. Besides, it satisfies relation being log (R2 /R1 )
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公开(公告)号：JPH07295330A
公开(公告)日：1995-11-10
申请号：JP8429994
申请日：1994-04-22
Applicant: BRIDGESTONE CORP
Inventor： NIWA HIDEYUKI , TAKIZAWA YOSHIO , KAWAGOE TAKAHIRO
Abstract: PURPOSE:To obtain safety such as enough heat resistance and weather resistance and to facilitate miniturization of devices such as an electrophotographic device and an electrostatic recording device by specifying the remaining rate of fracture elongation of a conductive elastic material after heating according to JISK6301 under specified heating conditions. CONSTITUTION:This conductive elastic material is used as the main material of a conductive member such as an electrifying member, transferring member, developing member and cleaning member used for an electrophotographic device, electrostatic recording device, and the like. The remaining rate of fracture elongation of this material after heating according to JISK6301 under heating conditions of 170 deg.C for 50 hours is specified to >=50%, preferably to >=60%, and more preferably to >=70%. The main material of the conductive elastic material is not limited, and fluororubber, silicone rubber, ethylene-propylene rubber EPM, ethylene-propylene-diene ternary copolymer rubber EPDM, acryl rubber, epichlorohydrin rubber can be used. These materials may be used singly or in the mixture of two or more kinds.
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公开(公告)号：JPH07281524A
公开(公告)日：1995-10-27
申请号：JP6825094
申请日：1994-04-06
Applicant: BRIDGESTONE CORP
Inventor： NIWA HIDEYUKI , YAKUSHIJI MANABU , TAKAGI MITSUHARU , TAKIZAWA YOSHIO , KAWAGOE TAKAHIRO
Abstract: PURPOSE:To obtain a non-contamination developing roller having a proper hardness and a small compression permanent set as the whole developing roller by forming an elastic layer of two, or more elastic layers mainly constituted of EPDM. CONSTITUTION:The elastic layer 3 formed on the outer circumference of a shaft 2 having good conductivity is formed of two, or more elastic layers which are mainly constituted of EPDM. It is preferable that the hardness of the elastic layer 3 used for the outermost layer is 45 deg. to 70 deg. by a JIS-A scale, when the hardness is too large, the developing roller 1 is not satisfactorily brought into tight contact with a photoreceptor drum, meanwhile, when the hardness is too small, the compression permanent set is increased, as a result, the defective image is induced. It is preferable that the hardness of the elastic layer 3' used for the layers other than the outermost layer is 30 deg. to 50 deg. by the JIS-A scale, when the hardness is too large, the developing roller 1 is not satisfactorily brought into tight contact with the photoreceptor drum, meanwhile, when the hardness is too small, it is impossible to maintain the developing roller as it is in terms of a shape.
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公开(公告)号：JPH07118578A
公开(公告)日：1995-05-09
申请号：JP31253593
申请日：1993-11-18
Applicant: BRIDGESTONE CORP
Inventor： MAEDA HIROKO , HARASHIMA HIROSHI , TAKIZAWA YOSHIO , KANEDA HIROSHI , KAWAGOE TAKAHIRO
IPC: C09D5/24 , C09D175/08
Abstract: PURPOSE:To provide an electroconductive coating which is little in moisture absorption and dependence of electric resistance on surroundings, and is improved in dielectric strength and dimensional stability, by containing an electroconductive material and a specific binder. CONSTITUTION:A polyol component mainly comprising polytetramethylene oxide is reacted with an isocyanate component to obtain a binder comprising a polyurethane having a no.-average mol.wt. of 5,000 to 200,000 and a wt.- average mol.wt. of 5,000 to 200,000. 100 pts.wt. binder is blended with 0.1-60 pts.wt. electroconductive material, and, if necessary, a leveling agent, a dispersing assistant, a defoaming agent, etc., to obtain an electroconductive coating. A base material such as an electroconductive rubber is coated with the electroconductive coating to obtain an electroconductive member having a thickness of 1 to 1,000mum.
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Patent Agency Ranking
公开(公告)号：JPH0792774A
公开(公告)日：1995-04-07
申请号：JP25938593
申请日：1993-09-22
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , YAKUSHIJI MANABU , KAWAGOE TAKAHIRO
IPC: G03G15/02 , B32B15/08 , B32B15/088 , F16C13/00
Abstract: PURPOSE:To manufacture a charging member which is excellent in charging property and charging environment stability, free from any dispersion of charging performance and prevented from being fused to an image bearer by forming the outermost surface of the charging member with a resin layer containing a specific copolymer nylon. CONSTITUTION:In the case of the charging member for charging a body to be charged by being brought into contact with the body to be charged and applying voltage across a space to the body to be charged, the contact part surface between the charging member and the body to be charged that is a skin layer 4 to cover the surface of a conductive rubber roller 2, is formed with a copolymer nylon containing resin layer containing 15wt.% nylon 12 component. In this case, the content of resin excluding copolymer nylon is preferably less than 50wt.%, especially 5 to 30wt.%. As resin excluding copolymer nylon, polyester, phenolic resin, etc., can be listed. The melting point of copolymer nylon is preferably 120 deg.C or lower, especially 90 to 110 deg.C.
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公开(公告)号：JPH05346723A
公开(公告)日：1993-12-27
申请号：JP30302992
申请日：1992-10-15
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , OFUKU EIJI , SUZUKI KINYA , MASUDA YOSHITOMO , HARASHIMA HIROSHI , KANEDA HIROSHI , KAWAGOE TAKAHIRO
IPC: G03G15/02
Abstract: PURPOSE:To obtain the electrostatic charging member having an excellent electrostatic charge characteristic and electrostatic charge environmental stability and has decreased variations in electrostatic charge performance in production by forming the surface of the contact part between the electrostatic charging member and a body to be electrostatically charged of a material contg. polycarbonate. CONSTITUTION:A surface skin layer 3 contg. the polycarbonate is formed on the surface of a roll-shaped base body 2. This skin surface layer (contact part) 3 is pressed to a photosensitive roll (body to be electrostatically charged) 4 and the voltage of DC or superposed with AC on the DC is applied between the electrostatic charging member 1 and the photosensitive roll 4 from a power source 5 to electrostatically charge the photosensitive roll 4. The surface layer coating the surface of the electrostatic charging member 1 is formed of the material contg. the polycarbonate in such a manner, by which the resistance change by the environment is lessened and the electrostatic charging member having the excellent electrostatic charge environmental stability is obtd. In addition, the resistance value changes relatively gently in accordance with the amt. of the addition in the case of the control of the surface resistance by the addition of the conductive particles and, therefore, the sure control to the desired resistance value is possible. The electrostatic charging member is thus surely produced without variation.
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公开(公告)号：JP2001192430A
公开(公告)日：2001-07-17
申请号：JP2000106910
申请日：2000-04-07
Applicant: BRIDGESTONE CORP
Inventor： MORI YUICHIRO , TANAKA RYUTA , INOUE SHU , TAKIZAWA YOSHIO
Abstract: PROBLEM TO BE SOLVED: To obtain a for better elastic material not causing roller shave when used as a developing roller, etc., in an electrophotographic apparatus and an antistatic recording apparatus, not giving rise to deterioration of abrasion characteristics being a defect of conventional silicone roller and to provide both the electrophotographic apparatus and an antistatic recording apparatus using the elastic roller. SOLUTION: This elastic material satisfies a relation of the formula log (Tb.Eb)-1}
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公开(公告)号：JP2001188412A
公开(公告)日：2001-07-10
申请号：JP2000106909
申请日：2000-04-07
Applicant: BRIDGESTONE CORP
Inventor： TANAKA RYUTA , TAKIZAWA YOSHIO , MORI YUICHIRO , INOUE SHU
Abstract: PROBLEM TO BE SOLVED: To provide a more excellent urethane roller which is free of roller chipping, and is good in releasing properties in molding and workability, such as machinability, and does not have the defects of a silicone roller by improving the conventional low-hardness urethane roller and solving the problem of a coefficient of friction. SOLUTION: The elastic body layer of the urethane roller consists mainly of a polyol component and isocyanate component and contains a single terminal type alcohol or amino denatured silicone oil having a siloxane bond at a main chain.
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公开(公告)号：JPH1069165A
公开(公告)日：1998-03-10
申请号：JP14102697
申请日：1997-05-15
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , TAKAGI MITSUHARU , KANEDA HIROSHI , NIWA HIDEYUKI , MIYAMOTO TARO , YAKUSHIJI MANABU , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain an image of high definition being free from a density unevenness, ground fogging or the like, and to prevent deterioration of the image quality regardless of the use over a long term by means of this developing roller. SOLUTION: In this developing roller composed of a conductive elastic layer 3 formed on a periphery of a conductive shaft 2, feeding the one component developer, by carrying the developer, on the elastic layer surface and forming the thin layer of the developer, when the elastic layer 3 contains the resin property on the surface, and assuming the roller resistance as R1 in the case the resin property is not provided while assuming the roller resistance as R2 in the case the resin property is provided, the following relation is satisfied, log (R2 /R1 )
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