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公开(公告)号：JPH11202615A
公开(公告)日：1999-07-30
申请号：JP1333298
申请日：1998-01-08
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , TAKAGI MITSUHARU , OKADA TOKUO , ARAI TOSHIAKI , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To absorb the dispersion of a foaming cell diameter of a foaming layer and to obtain an excellent image by lowering the resistance of a non- foaming rubber layer laminated on the foaming layer. SOLUTION: An elastic layer 3 equipped with a 1st elastic layer 31 made of conductive foaming rubber and a 2nd elastic layer 32 made of conductive non-foaming rubber is formed on the outer periphery of a good conductive shaft 2, and further a surface layer 4 is formed on the elastic layer 3 as necessary. In such a case, 0.0001 to 10 Ω.cm are satisfied when it is assumed that the volume specific resistance of the 1st elastic layer 31 is ρ1 and that of the 2nd elastic layer 32 is ρ2. The rubber foaming body having conductivity, which forms the 1st elastic layer 31, is the foaming elastic body obtained by adding conductive agent, foaming agent and cross linking agent to rubber material and cross-linking and foaming the rubber. Furthermore, the non-foaming rubber having the conductivity, which constitutes the 2nd elastic layer 32, is the elastic body obtained by adding the conductive agent and the cross linking agent to the rubber material and cross-linking the rubber.
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公开(公告)号：JPH11160999A
公开(公告)日：1999-06-18
申请号：JP34446697
申请日：1997-11-28
Applicant: BRIDGESTONE CORP
Inventor： OKADA TOKUO , TAKIZAWA YOSHIO , TAKAGI MITSUHARU , ARAI TOSHIAKI , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain a toner carrier constituted so that an excellent image is stably formed without causing halftone or white surface fogging on the image even when it is used in a long term and deteriorating image quality though an environment is fluctuated. SOLUTION: This roller-like toner carrier is constituted so that the sum of A and B is
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公开(公告)号：JPH117190A
公开(公告)日：1999-01-12
申请号：JP12687998
申请日：1998-04-21
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , TAKAGI MITSUHARU , OKADA TOKUO
Abstract: PROBLEM TO BE SOLVED: To obtain a toner carrying roller capable of surely obtaining an excellent image without causing the inconvenience such as the density lowering or the occurrence of fogging in successive printing and even in a process using a high speed process or a fine grain size toner. SOLUTION: This roller is constituted so as to carry a toner on the surface and form a thin layer of the toner, to bring into contact with or close contact with an image forming material in this state and to form a visual image on the surface of the image forming material by feeding the toner on the surface of the image forming material. In this case, the roller is composed so that an elastic layer 3 having conductivity is made to be furnished and a cross- linking resin containing an epoxy resin is applied on the surface of this elastic layer 3.
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公开(公告)号：JPH10123826A
公开(公告)日：1998-05-15
申请号：JP15280997
申请日：1997-05-27
Applicant: BRIDGESTONE CORP
Inventor： TAKAGI MITSUHARU , TAKIZAWA YOSHIO , SAWA EIJI
Abstract: PROBLEM TO BE SOLVED: To obtain a developing roller capable of obtaing such images that are not lowered in density and can be surely reproduced as excellent images over a long term, even when it is used for a long time. SOLUTION: An electrical conductive elastic layer 3 is formed on the outside circumference of a good electrical conductive shaft 2. Then, one-component developer is carried on the surface of the layer 3 so as to form the thin layer thereof. By bringing the developing roller into contact with an image forming body or making it proximate to the image forming body in such a state and supplying the developer to the surface of the image forming body, a visible image is formed on the surface of the image forming body. In such a case, the layer 3 is provided with a resin component whose elongation percentage of a break time by the standard of JIS K7113 is
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公开(公告)号：JPH09171309A
公开(公告)日：1997-06-30
申请号：JP9881796
申请日：1996-04-19
Applicant: BRIDGESTONE CORP
Inventor： KANEDA HIROSHI , SAWA EIJI , TANAKA RYUTA , TAKIZAWA YOSHIO , TAKAGI MITSUHARU , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To make it possible to widen the nip width between a transfer roller and an intermediate transfer medium or a photoreceptor drum and to prevent the degradation in transfer efficiency by providing the outer side of the elastic layers of the transfer roller with a non-foamed layer and laminating at least >=1 layers of foamed layers on the inner side of this non-foamed layer, thereby providing a roller with a specific hardness and surface roughness. SOLUTION: This transfer roller has at least >=2 layers of the elastic layers formed on the outer periphery of a shaft and transfers developer to a recording medium by electrostatically charging this recording medium. The outer side of the elastic layer of such transfer roller is provided with the non-foamed layer 13 and at least >=1 layer of the foamed layers 12 are laminated on the inner side of the non-foamed layer 13. In addition, the Asker C hardness of the transfer roller is specified to 10 to 70 deg. and the surface roughness to
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Patent Agency Ranking
公开(公告)号：JPH08272211A
公开(公告)日：1996-10-18
申请号：JP25910595
申请日：1995-10-05
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , TAKAGI MITSUHARU , KANEDA HIROSHI , KAWAGOE TAKAHIRO , MIYAMOTO TARO
Abstract: PURPOSE: To prevent contamination on a photoreceptor or the like, irregular density or fog on the base and to decrease deterioration in images after long- term use by forming two or more urethane layers to constitute an elastic layer in such a manner that the outermost layer is made of an elastomer and one or more of other layers are made of foamed urethane. CONSTITUTION: This roller 1 consists of a shaft 2 and at least two conductive elastic layers 3a around the shaft 2. The elastic layers 3a consist of urethane. The outermost layer 3b of the elastic layers 3a is made of an elastomer and at least one layer except for the outermost layer 3b is made of foamed urethane. In this case, the shaft 2 used has no limitation, and metals or plastics can be used as far as it can hold the roller 1 and rotate. The polyurethane elastomer of the outermost layer 3b has a function of wear resistance, while the foamed polyurethane except for the outermost layer 3b has a function of low hardness. The roller 1 may have a structure of two or more layers.
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公开(公告)号：JPH08123191A
公开(公告)日：1996-05-17
申请号：JP21509195
申请日：1995-08-23
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , TAKAGI MITSUHARU , KAWAGOE TAKAHIRO
Abstract: PURPOSE: To obtain a high quality image while getting rid of the density unevenness, the ground fog, the character thinning or the like even after using over a long time, by providing the corrugated stripe on the conductive layer surface of a developing roller and composing the corrugated stripe into the fine raggedness alternately formed along with the rotary direction of the developing roller. CONSTITUTION: In the developing roller 1 composed of the conductive layer 3 formed on the good conductive shaft 2, on the surface of the conductive layer 3, the corrugated stripe whose longitudinal direction approximately lies along the shaft direction and the corrugated stripe is composed into the fine raggedness alternately formed along with the rotary direction of the developing roller 1. Such a corrugated stripe is more suited for the transporting property of the developer, and moreover the uniform transportation is made possible by alternately forming the corrugated stripe along the rotary direction in a specified distance. The raggedness is formed by applying the grinding work to the developing roller 1. Thus, the high quality image getting rid of the density unevenness, the ground fog or the like. Moreover, it is effective for stabilizing the developer transporting amount and the image quality that the this shape is provided even after using over the long time.
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公开(公告)号：JPH07311493A
公开(公告)日：1995-11-28
申请号：JP21888494
申请日：1994-09-13
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , YAKUSHIJI MANABU , KAWAGOE TAKAHIRO , MURATA KAZUYA , MORIKAWA SHOHEI
IPC: G03G15/02 , C08L75/16 , C08L83/05 , C09D175/14 , C09D175/16 , F16C13/00 , G03G15/16
Abstract: PURPOSE:To considerably improve such defects of a conventional electrifying member as to cause the fusion of a toner to an image carrier and to obtain an electrifying member excellent in electrifying characteristics and stability of performance. CONSTITUTION:When an electrifying member for contact electrification is produced, the surface of the contact part of the electrifying member brought into contact with a body to be electrified is made of a resin layer 4 contg. urethane modified acrylic resin having 5-80wt.% acrylic resin component to obtain the objective electrifying member. The objective electrifying device is obtd. using this electrifying member.
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公开(公告)号：JPH07219336A
公开(公告)日：1995-08-18
申请号：JP16599494
申请日：1994-06-24
Applicant: BRIDGESTONE CORP
Inventor： NIWA HIDEYUKI , TAKIZAWA YOSHIO , YAMAZAKI HIROTAKA , YAKUSHIJI MANABU , KAWAGOE TAKAHIRO
Abstract: PURPOSE:To obtain a developing roller which can be produced in a simple production process at rather low cost, has excellent ozone resistance and excellent wear characteristics so that it does not deteriorate due to friction with a cleaning blade or the like, and does not cause image for even in a high-temp. and high-humidity environment. CONSTITUTION:This roller consists of a high conductive shaft 2 and an elastic layer 3 having conductivity formed on the circumference of the shaft 2. A nonmagnetic one-component developer is deposited on the elastic layer 3 to form a thin layer of the developer. The roller in this state is brought into contact with an latent image holding body having an electrostatic latent image on the surface so that the developer is deposited from the thin layer to the electrostatic latent image on the surface of the latent image holder to visualize the electrostatic latent image. The elastic layer 3 essentially consists of EPDM.
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公开(公告)号：JP2002162845A
公开(公告)日：2002-06-07
申请号：JP2001258954
申请日：2001-08-29
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , YAKUSHIJI MANABU , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain a transfer member having low hardness and good adhesion, free of such a disadvantage as to contaminate a photoreceptor, etc., giving a high-grade image free from unevenness in density and surface fog and not causing the deterioration of image quality even in long-term use. SOLUTION: The transfer member transfers an image formed by electrifying transfer paper and making an electrostatic latent image visible with a developer to the transfer paper in an electrophotographic device. The transfer member is formed with an elastic base material and its surface is formed with a resin layer containing a urethane modified acrylic resin obtained by chemically bonding a urethane resin component and an acrylic resin component. The proportion of the acrylic resin component contained in the urethane modified acrylic resin constituting the resin layer is 5-80 wt.%.
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