-
公开(公告)号：JP2002070840A
公开(公告)日：2002-03-08
申请号：JP2000255305
申请日：2000-08-25
Applicant: BRIDGESTONE CORP
Inventor： TANAKA RYUTA , TAKIZAWA YOSHIO , INOUE SHU
Abstract: PROBLEM TO BE SOLVED: To provide a method for manufacturing an elastic roller having a homogeneous and smooth surface suitable for members for an image-forming apparatus, with a short time and with high productivity. SOLUTION: In the case where a grinding process by plunge formula is applied to the outer surface of the elastic roller materials wherein an elastic body layer is formed on the outer periphery around a revolution central axis, the elastic roller with homogeneous and smooth surface is manufactured, by applying and oscillation grinding process using a polishing grind stone having a width of 0.9 to 1.3 times of the axial length of the elastic body layer.
-
公开(公告)号：JP2000147897A
公开(公告)日：2000-05-26
申请号：JP32417598
申请日：1998-11-13
Applicant: BRIDGESTONE CORP
Inventor： TANAKA RYUTA , TAKIZAWA YOSHIO
Abstract: PROBLEM TO BE SOLVED: To provide a toner carrier with excellent toner followup ability, being free from lowering of an image density regardless of adopting over a long period, and to provide an image forming device adopting this toner carrier. SOLUTION: This toner carrier is, allowed to form the visual image by carrying the toner on a surface, forming a thin layer thereof, coming into contact with or close to the image forming body, and feeding the toner on the image forming body surface. In such a case, the toner carrier is composed by controlling peak count in the measuring length 2.5 mm to 10 to 30, and the toner carrier is provided with the conductive layer 3, and moreover the surface thereof is composed by grinding or polishing.
-
公开(公告)号：JPH1195543A
公开(公告)日：1999-04-09
申请号：JP17996198
申请日：1998-06-26
Applicant: BRIDGESTONE CORP
Inventor： TAKAGI MITSUHARU , TAKIZAWA YOSHIO , OKADA TOKUO , KANEDA HIROSHI , IWAMI KOICHI
Abstract: PROBLEM TO BE SOLVED: To provide a developing roller capable of obtaining an image high in quality and high in gradation. SOLUTION: In this developing roller by which a visible image is formed on the surface of an image forming body by carrying a one-component developer on the surface to form a thin layer of the developer and being in contact with or nearer to an image forming body in this state to supply the developer onto the surface of the image forming body, an elastic layer having a high-resistant resin component applied on the surface and electronic conductivity is provided, and when roller resistance in a standstill state is defined as R1 and roller resistance in a rotational state is defined as R2, R1
-
公开(公告)号：JPH10213965A
公开(公告)日：1998-08-11
申请号：JP4290898
申请日：1998-02-09
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , HARASHIMA HIROSHI , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain a developing roller having low hardness and good adhesion property which gives a good image of high quality without irregular density or fog, problems to be caused such as contamination of a photoreceptor, nor deterioration in the image quality even when the roller is used for a long time. SOLUTION: The developing roller 1 is produced by forming an elastic layer 3 having conductivity around a conductive shaft 2. The elastic layer 3 consists of a urethane elastomer containing carbon black of pH>=5. The urethane elastomer is obtd. by using modified diphenylmethane-4,4'-diisocyanate or crude diphenylmethane-4,4'-diisocyanate as isocyanate.
-
公开(公告)号：JPH10115979A
公开(公告)日：1998-05-06
申请号：JP15444697
申请日：1997-05-28
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , TAKAGI MITSUHARU
Abstract: PROBLEM TO BE SOLVED: To provide a developing roller capable of effectively preventing the generation of a leakage mark derived from the leakage of the electric charge from a developing roller, and surely obtaining an excellent image by preventing the occurrence of the other image defect such as ground fogging. SOLUTION: In the developing roller composed by forming a conductive layer 3 on the periphery of a conductive shaft 2, carrying the one component developer and forming the thin layer of the developer on the conductive layer 3 surface, and in this state, coming into contact with or close to the latent image carrier holding the electrostatic latent image on the surface, and feeding the developer on the latent image carrier surface, turning the electrostatic latent image visible, the developing electrostatic capacity is adjusted so as to become below 1500pF.
-
Patent Agency Ranking
公开(公告)号：JPH09222788A
公开(公告)日：1997-08-26
申请号：JP25777996
申请日：1996-09-06
Applicant: BRIDGESTONE CORP
Inventor： TAKAGI MITSUHARU , TAKIZAWA YOSHIO , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To provide a developing roller which has low hardness and good adhesion property, has excellent conduction stability and contamination resistance and with which stable and good images are surely obtainable in spite of long-term use and a developing device formed by using the roller. SOLUTION: This developing roller is constituted by forming an elastic layer 3 having electrical conductivity on the outer periphery of a good conductive shaft 2 and visualizes an electrostatic latent image by coming into contact with or proximity with a latent image holder which is formed with a thin layer of a developer by depositing this developer on its surface and is held with the electrostatic latent image on the surface in this state, thereby supplying the developer to the surface of the latent image holder. A conductive layer 4 contg. carbon black having an oil absorption rate of /g is formed on the surface of the elastic layer 3.
-
公开(公告)号：JPH09190074A
公开(公告)日：1997-07-22
申请号：JP6541396
申请日：1996-02-27
Applicant: BRIDGESTONE CORP
Inventor： TAKAGI MITSUHARU , TAKIZAWA YOSHIO , KANEDA HIROSHI , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To surely prevent ordinary fogging and a defect such as image memory from occurring, to easily and surely control compatibility between toner and a developing roller and to surely prevent high-potential fogging from occurring by directly injecting charge in toner and increasing and uniformizing the electrostatic charge amount of the toner. SOLUTION: In this developing method; developer 4 is supplied to the surface of a latent image holding body 3 to make an electrostatic latent image on the surface of the holding body 3 visualizable. The ionization potential of the surface of the developer 4 is set to 4.5 to 5.5eV, and the ionization potential of the surface of the developing roller 1 is adjusted to be equal to or above the ionization potential of the surface of the developer 4 in the case of negatively electrostatically charging the developer and it is adjusted to be equal to or under the ionization potential of the surface of the developer 4 in the case of positively electrostatically charging the developer. Then, development is performed.
-
公开(公告)号：JPH07310732A
公开(公告)日：1995-11-28
申请号：JP22702194
申请日：1994-09-21
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , YAKUSHIJI MANABU , KAWAGOE TAKAHIRO
IPC: G03G15/16 , C09D175/00 , C09D175/04 , C09D175/14 , C09D175/16 , F16C13/00 , G03G15/08 , G03G15/20 , G03G21/10
Abstract: PURPOSE:To prevent the contamination of a photosensitive member or the like by forming the surface of a conductive member out of a resin layer containing urethane modified acrylic resin having the the specified amount of an acrylic resin component. CONSTITUTION:A conductive roller has a multilayer structure with twp layers sequentially formed around a mandrel 1 of stainless steel or the like. A substrate is a conductive elastic layer 2 made electrically conductive through the dispersion of conductive carbon in urethane rubber, urethane foam or ethylene- propylene rubber, and a skin layer 4 is formed as a coating layer on the layer 2. The layer 4 is formed of a resin layer containing urethane modified acrylic resin having an acrylic resin component between 5 and 80wt.%. As a result, a conductive member can be provided, ensuring a less resistance change due to environment, freedom from the contamination of a photosensitive member, high stability against charging environment, and further freedom from toner deposition on surface, clogging or the like, due to a repeated service.
-
公开(公告)号：JPH0659554A
公开(公告)日：1994-03-04
申请号：JP22916892
申请日：1992-08-05
Applicant: BRIDGESTONE CORP
Inventor： MASUDA YOSHITOMO , SUZUKI KINYA , KANEDA HIROSHI , TAKIZAWA YOSHIO , HARASHIMA HIROSHI , KAWAGOE TAKAHIRO
IPC: G03G15/02
Abstract: PURPOSE:To obtain excellent electrostatic charging characteristic and to satisfactorily and stably electrostatically charge a body to be electrostatically charged by changing the work function of an electrostatic charging member in accordance with positive or negative in the case of electrostatically charging the body to be electrostatically charged. CONSTITUTION:The electrostatic charging member 1 obtained by coating the outer peripheral surface of a roller-like base substance 2 equipped with a core bar with a facing layer 3 is allowed to abut on the body to be electrostatically charged 4 such as a photo-sensitive drum, etc., and voltage is impressed between the member 1 and the body 4 by a power source 5, so that the body 4 is electrostatically charged. In such a case, the elelctrostatic charging is performed while the member 1 and the body 4 are rotated in an opposite direction, whereby the entire surface of the body 4 is electrostatically charged. The member 1 is formed by selecting a material so that the work function of the member 1 may be smaller than that of the body 4 in the case of electro-statically charging the body 4 to be negative, and the work function of the member 1 may be larger than that of the body 4 in the case of electrostatically charging the body 4 to be positive.
-
公开(公告)号：JP2002132064A
公开(公告)日：2002-05-09
申请号：JP2001258956
申请日：2001-08-29
Applicant: BRIDGESTONE CORP
Inventor： TAKIZAWA YOSHIO , YAKUSHIJI MANABU , KAWAGOE TAKAHIRO
Abstract: PROBLEM TO BE SOLVED: To obtain an intermediate transfer member which has low hardness and proper adhesion property, does not give rise to nonconformities, such as contamination of a photoreceptor or the like, obtains high-quality images free of density unevenness, surface fogging, etc., and does deteriorate image quality, in spite of long-term use. SOLUTION: This intermediate transfer member for a full-color electrophotographic device transfers the toner images formed in respective developing devices for cyan, magenta, yellow and black to its surface and forms the toner images superposed with the four colors. The intermediate transfer member described above is formed of an elastic base material, and its surface is formed of a resin layer containing a urethane denatured acrylic resin formed by chemical bonding of a urethane resin component and an acrylic resin component and the content ratio of the acrylic resin component in the urethane denatured acrylic resin constituting the resin layer is 5 to 80 wt.%.
-
-
-
-
-
-
-
-
-
Search Results
63
records
(took 0.026 seconds)
