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41. 发明专利

JP2002107976A IMAGE FORMING METHOD, PHOTORECEPTOR AND TONER FOR USE THE METHOD 审中-公开
公开(公告)号：JP2002107976A
公开(公告)日：2002-04-10
申请号：JP2001217250
申请日：2001-07-17
申请人： RICOH KK
发明人： SASAKI FUMIHIRO , AOKI MITSUO , IWAMOTO YASUTAKA , SHIMODA NAOTO , YAZAKI KAZUYUKI , MATSUDA HIROAKI , NAKAI HIROSHI , HASEGAWA HISAMI , YAGI SHINICHIRO , HIGUCHI HIROTO , SUGIYAMA AKIYOSHI
IPC分类号： G03G9/08 , G03G5/04 , G03G5/05 , G03G9/087
摘要： PROBLEM TO BE SOLVED: To provide an image forming method, toner, and an electrophotographic photoreceptor, whereby a highly accurate image can be obtained without causing a transfer failure on an image forming material even in use of a toner having smaller spherical diameter. SOLUTION: In the image forming method in which an electrostatic latent image which is formed on the electrophotographic photoreceptor by an electrifying and exposure means is developed with a two-component developer which contains toner and carrier and the developed visible image is transferred to a transfer material via or without an intermediate transfer member, a frictional coefficient (B) of the electrophotographic photoreceptor is less than or equal to 0.40 and an average spherical degree (A) of the toner is greater than or equal to 0.930.

42. 发明专利

JP2001305862A DEVELOPING METHOD AND DEVICE 失效
公开(公告)号：JP2001305862A
公开(公告)日：2001-11-02
申请号：JP2000123179
申请日：2000-04-24
申请人： RICOH KK
发明人： MOCHIZUKI MASARU , YAGI SHINICHIRO , NAKAI HIROSHI , MASUI MINORU , YAMAGUCHI KIMITOSHI
IPC分类号： G03G15/09 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide a developing method and device capable of forming stable images by regularly supplying developer to the developer carrier despite of the use of small-diameter particle carrier. SOLUTION: In this developing method, the developing device has a fixed magnet faced to a developer carrier which is rolling with retaining developer on the surface and also has a part of regulating the amount of the developer made of rigid or rigid and magnetic materials. Electrostatic latent images are developed with two-component developer consisting of toner and magnetic carriers characterized by 20-60 μm of the weight average particle diameter and 10-30 μm of Rz, the surface roughness of developing sleeve.

43. 发明专利

JPH11295910A ELECTROPHOTOGRAPHIC PHOTORECEPTOR 失效
公开(公告)号：JPH11295910A
公开(公告)日：1999-10-29
申请号：JP12006998
申请日：1998-04-14
申请人： RICOH KK
发明人： NAKAI HIROSHI , MIYAZAKI KUNIHIKO
IPC分类号： G03G5/05 , G03G5/06
摘要： PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor having enough adhesion property which can maintain a stable potential in a copying machine even when the photoreceptor is repeatedly used for a long time. SOLUTION: This electrophotographic photoreceptor has at least a charge producing layer and a charge transfer layer successively formed on a conductive base body. The charge producing material in the charge producing layer consists of one or more kinds of trisazo pigments and/or bisazo compds. The charge transfer layer contains phthalocyanine pigments (preferably titanylphthalocyanine compds. or nonmetal phthalocyanine compds.).

44. 发明专利

JPH10319616A ELECTROPHOTOGRAPHIC PHOTORECEPTOR 失效
公开(公告)号：JPH10319616A
公开(公告)日：1998-12-04
申请号：JP12748097
申请日：1997-05-16
申请人： RICOH KK
发明人： IKEGAMI TAKAAKI , SUZUKI YASUO , TAMOTO NOZOMI , NAKAI HIROSHI , KISHIDA KOJI
IPC分类号： G03G5/05 , G03G5/147
摘要： PROBLEM TO BE SOLVED: To obtain a high durability electrophotographic photoreceptor free from the rise of residual potential at the time of repetitive use and having high transfer efficiency and improved cleanability by incorporating a mixture of methacrylic modified polysiloxane with another modified polysiloxane into the outermost layer of an electrophotographic photoreceptor. SOLUTION: A single photosensitive layer 15 contg. an electric charge generating material and an electric charge transferring material as principal components is formed on an electrically conductive substrate 11 and a mixture of acrylic modified polysiloxane with another modified polysiloxane is incorporated into the layer 15 as the outermost layer. In the case of a laminated photoreceptor, one of an electric charge generating layer and an electric charge transferring layer positioned on the outside is the outermost layer. The another modified polysiloxane is, e.g. mercapto modified polysiloxane, phenol modified polysiloxane, polyether modified polysiloxane, fatty acid ester modified polysiloxane, polysiloxane modified with different functional groups or fluorine modified polysiloxane.

45. 发明专利

JPH10307414A ELECTROPHOTOGRAPHIC PHOTORECEPTOR 失效
公开(公告)号：JPH10307414A
公开(公告)日：1998-11-17
申请号：JP11723197
申请日：1997-05-07
申请人： RICOH KK
发明人： SUZUKI YASUO , IKEGAMI TAKAAKI , TAMOTO NOZOMI , NAKAI HIROSHI , KISHIDA KOJI
IPC分类号： G03G5/147 , G03G5/05
摘要： PROBLEM TO BE SOLVED: To provide the electrophotographic photoreceptor free from rise of residual potential in repeating uses and high in transfer efficiency and improved in cleanability by incorporating a mixture of a polyether-modified and another modified polysiloxane in the outermost layer of the photoreceptor. SOLUTION: The mixture of the polyether-modified polysiloxane and the other polysiloxane modified by an alkyl or aliphatic acid ester or vinyl group are contained in the outermost layer of the photoreceptor, and the binder resin of thus outermost layer is a polycarbonate comprising main repeating structural units each represented by the formula in which Z is a nonmetallic atomic group necessary to form an optionally substituted C or hetero ring, and each of R -R is an H or halogen atom or an optionally substituted aliphatic or carbon ring group.

46. 发明专利

JPH10268545A ELECTROPHOTOGRAPHIC PHOTORECEPTOR 失效
公开(公告)号：JPH10268545A
公开(公告)日：1998-10-09
申请号：JP7798197
申请日：1997-03-28
申请人： RICOH KK
发明人： IKEGAMI TAKAAKI , SUZUKI YASUO , TAMOTO NOZOMI , NAKAI HIROSHI , KISHIDA KOJI
IPC分类号： G03G5/147
摘要： PROBLEM TO BE SOLVED: To obtain an electrophotographic photoreceptor high in transfer efficiency, improved in cleaning property and high in durability without in creaning the residual potential when it is repeatedly used and which shows by incorporating a mixture of an alkoxy-modified polysiloxane and a polysiloxane modified with different functional groups from the first polysiloxane into the outermost layer of an electrophotographic photoreceptor. SOLUTION: The outermost layer of an electrophotographic photoreceptor having a photosensitive layer 15 on a conductive substrate 11 contains a mixture of an alkoxy- modified polysiloxane and a polysiloxane modified with different functional groups from the first polysiloxane. The outermost layer is a layer containing the polysiloxane mixture and a formed on the surface of the electrophotographic photoreceptor. Therefore, when a single-layer photoreceptor is produced, the photosensitive layer 15 in the outermost layer. When a laminated photoreceptor is produced, the one of a charge producing layer and a charge transfer layer which is formed on the surface is the outermost layer. In this method, the polysiloxane mixture is incorporated into a coating layer for the outermost layer. If the amt. of the mixture is increased, it is preferable to dissolve or disperse a specified material in a solvent for the coating liquid into which the polysiloxane mixture is incorporated.

47. 发明专利

JP2003263032A DEVELOPING METHOD, DEVELOPING DEVICE AND IMAGE FORMING APPARATUS 审中-公开
公开(公告)号：JP2003263032A
公开(公告)日：2003-09-19
申请号：JP2002065282
申请日：2002-03-11
申请人： RICOH KK
发明人： NAKAI HIROSHI , ICHIKAWA TOMOYUKI
IPC分类号： G03G9/08 , G03G9/10 , G03G15/08 , G03G15/09
摘要： PROBLEM TO BE SOLVED: To provide a developing method capable of maintaining good image quality without causing failures such as surface staining and toner scattering, etc., by suppressing the embedding of toner external additive even in the case where stirring is performed in various developing devices over a long period. SOLUTION: The developing method for developing an electrostatic latent image on an electrostatic latent image carrier using the developing device equipped at least with a developer carrier 4 for attracting and holding two- component developer 3 constituted of toner 3a and a magnetic carrier by the magnetic force and transporting the developer into a developing area 12 facing the electrostatic latent image carrier 1, and a doctor blade 6 for controlling the layer thickness of the two-component developer 3 on the developer carrier 4, is characterized in that the ratio W/M of a moving torque W [kgf×cm] applied to the two-component developer 3 to the amount of toner M [g] contained in the two-component developer is set to be ≤4.0×10 -2 when the developing device is being driven. COPYRIGHT: (C)2003,JPO

48. 发明专利

JP2003208028A DEVELOPING METHOD, IMAGE FORMING METHOD AND IMAGE FORMING APPARATUS 审中-公开
公开(公告)号：JP2003208028A
公开(公告)日：2003-07-25
申请号：JP2002007073
申请日：2002-01-16
申请人： RICOH KK
发明人： NAKAI HIROSHI , KUROSU HISAO
IPC分类号： G03G15/09 , G03G15/06
摘要： PROBLEM TO BE SOLVED: To solve the problem that realization of a stable image over a long period of time while maintaining a high developing function is difficult because the margin of toner filming is small to a photoreceptor containing filler. SOLUTION: A toner T is made to be separated from magnetic carrier C to be turned into a free toner when a nap of gathered magnetic carrier C is standing on a developer carrier 111 in a developing range between an image carrier 100 and the developer carrier 111. Then, an electrostatic latent image is developed by the free toner. COPYRIGHT: (C)2003,JPO

49. 发明专利

JP2002323792A IMAGE FORMING METHOD AND ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER USED FOR THE SAME 审中-公开
公开(公告)号：JP2002323792A
公开(公告)日：2002-11-08
申请号：JP2002042191
申请日：2002-02-19
申请人： RICOH KK
发明人： IWAMOTO YASUTAKA , SASAKI FUMIHIRO , MATSUDA HIROAKI , NAKAI HIROSHI , HIGUCHI HIROTO , SHU HIYO , KONDO MAIKO
IPC分类号： G03G15/02 , G03G9/08
摘要： PROBLEM TO BE SOLVED: To provide an image forming method by an electrophotographic system which hardly produces ozone masses during uniform electrostatic charging to a photoreceptor and does not give rise to contamination of an electrostatic charging member with ozone, an image forming device and toners used for the same. SOLUTION: The contact electrostatic charging system using an electrostatic charging roller is adopted. The surface roughness of the contact electrostatic charging roller is 2 to 40 μm. Binder resins having at least one peak between 1,000 to 10,000 in the value of the molecular weight distribution by GPC determined by a THF soluble component and are below a molecular weight 15,000 in the half width of the molecular weight distribution age used as the binder reins of the toners.

50. 发明专利

JP2002278261A IMAGE FORMING APPARATUS, IMAGE FORMING METHOD AND TONER 失效
公开(公告)号：JP2002278261A
公开(公告)日：2002-09-27
申请号：JP2001074048
申请日：2001-03-15
申请人： RICOH KK
发明人： SASAKI FUMIHIRO , AOKI MITSUO , IWAMOTO YASUTAKA , SHIMODA NAOTO , MATSUDA HIROAKI , NAKAI HIROSHI , HIGUCHI HIROTO , SHU HIYO
IPC分类号： G03G9/08 , G03G15/08
摘要： PROBLEM TO BE SOLVED: To provide an image forming apparatus where the toner for developer can be sufficiently electrified even when used for a high speed copying machine, filming of toner, etc., is not generated on a photoreceptor surface, wear of the photoreceptor surface is extremely small even when eliminated by cleaning and hardly scarred so that a photoreceptor is not damaged, and to provide an image forming method and a toner. SOLUTION: In the image forming apparatus provided with a developing device where toner concentration in the developer on a developer carrier feeding the developer to the photoreceptor is raised and passing of the increased portion of the developer when the thickness of the layer of the developer is increased can be restricted, the toner is used in which additives consisting of inorganic particulates are added to base particles consisting of at least binding resin and colorants and magnetic carrier consists of at least magnetic body and a separation rate of the additives in the toner is from 0.5 to 20%.

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