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1. 发明专利

DE60118486T2 未知
公开(公告)号：DE60118486T2
公开(公告)日：2006-11-23
申请号：DE60118486
申请日：2001-09-28
申请人： RICOH KK
发明人： KATOH KOHKI , NANYA TOSHIKI , FUSHIMI HIROYUKI , UCHINOKURA OSAMA , YAGI SHINICHIRO
IPC分类号： G03G9/087 , G03G13/00
摘要： The electrophotographic toner according to the present invention comprises a binder resin, a colorant, and a negative charge control agent. The binder resin is polyester and/or polyol. The negative charge control agent comprises components which are (1) sulfonic-acid containing monomers, (2) aromatic monomers having electron-withdrawing groups, and (3) acrylate monomers and/or methacrylate monomers. In particular, substituted phenyl maleimides and substituted phenyl itaconimides are prefereably used as the aromatic monomers. Moreover, n-butyl (meth)acrylates and 2-ethylhexyl (meth)acrylates are prefereably used as the acrylate monomers and/or methacrylate monomers.

2. 发明专利

DE60114933T2 未知
公开(公告)号：DE60114933T2
公开(公告)日：2006-07-27
申请号：DE60114933
申请日：2001-06-26
申请人： RICOH KK
发明人： WATANABE YOHICHIROH , SUZUKI MASANORI , YAMASHITA MASAHIDE , SHIRAISHI KEIKO , WATANABE KAZUHITO , KATOH KOHKI , SAWADA TOYOSHI , SAITO TAKUYA
IPC分类号： G03G9/08 , G03G9/087 , G03G9/09 , G03G15/20

3. 发明专利

DE60211995D1 未知
公开(公告)号：DE60211995D1
公开(公告)日：2006-07-20
申请号：DE60211995
申请日：2002-04-02
申请人： RICOH KK
发明人： FUSHIMI HIROYUKI , NANYA TOSHIKI , UCHINOKURA OSAMU , YAGI SHINICHIRO , KATOH KOHKI
IPC分类号： G03G9/087 , G03G9/097
摘要： A toner comprises a polyester binder resin which does not contain a tetrahydrofuran-insoluble compound, a colorant, and a charge controlling agent. The binder has molecular weight distribution peak at 3,000-9,000. The charge controller has units derived from sulfonate group-containing monomers, electron acceptor group-containing aromatic monomers , and (meth)acrylic ester monomers. A toner comprises: (I) a binder resin which does not contain a tetrahydrofuran-insoluble compound, and comprises a polyester resin which: (a) contains = 4 wt.% of components having a molecular weight of = 500; and (b) has a molecular weight distribution peak at 3,000-9,000 (according to gel permeation chromatography); (II) a colorant; and (III) a charge controlling agent comprising a resin containing units obtained from: (a) a sulfonate group-containing monomer (IIIa); (b) an aromatic monomer having an electron acceptor group (IIIb); and (c) an acrylic ester and/or a methacrylic ester monomer (IIIc). Independent claims are also included for: (1) a one or two-component developer comprising the toner and optionally a carrier; (2) a container containing the developer; (3) an image forming method comprising: (i) forming an electrostatic latent image on a substrate; (ii) developing the image with the developer (iii) transferring the toner image onto a receiving material; and (iv) fixing the toner image on the material with application of heat; (4) a color image forming method comprising: (i) developing electrostatic latent images formed on several substrates with several of the color developers, each comprising a different color toner; and (ii) transferring the color toner images onto a receiving material one at a time with a transfer means, while pressing the receiving material against each of the substrates; (5) an image forming apparatus comprising: (i) an irradiator for irradiating a substrate means to form an electrostatic latent; (ii) an image developer to develop the image with a developer to form a toner image; (iii) a transfer means to transfer the toner image onto a receiving material; (iv) a fixing means to fix the toner image on the receiving material upon application of heat; and (v) a container to contain the developer; and (6) a color image forming apparatus comprising: (i) an image developer comprising several developing portions each comprising a different color developer comprising a toner, configured to develop electrostatic latent images formed on several substrates with the color developers to form a different color toner image on each of the substrates; and (ii) a transfer means to transfer the color toner images onto a receiving material sequentially while pressing the receiving material against each of the substrates.

4. 发明专利

HK1050934A1 Toner, developer, and image forming method and apparatus 未知
公开(公告)号：HK1050934A1
公开(公告)日：2003-07-11
申请号：HK03103088
申请日：2003-04-30
申请人： RICOH KK
发明人： FUSHIMI HIROYUKI , NANYA TOSHIKI , UCHINOKURA OSAMU , YAGI SHINICHIRO , KATOH KOHKI
IPC分类号： G03G9/087 , G03G9/097 , G03G
摘要： A toner comprises a polyester binder resin which does not contain a tetrahydrofuran-insoluble compound, a colorant, and a charge controlling agent. The binder has molecular weight distribution peak at 3,000-9,000. The charge controller has units derived from sulfonate group-containing monomers, electron acceptor group-containing aromatic monomers , and (meth)acrylic ester monomers. A toner comprises: (I) a binder resin which does not contain a tetrahydrofuran-insoluble compound, and comprises a polyester resin which: (a) contains = 4 wt.% of components having a molecular weight of = 500; and (b) has a molecular weight distribution peak at 3,000-9,000 (according to gel permeation chromatography); (II) a colorant; and (III) a charge controlling agent comprising a resin containing units obtained from: (a) a sulfonate group-containing monomer (IIIa); (b) an aromatic monomer having an electron acceptor group (IIIb); and (c) an acrylic ester and/or a methacrylic ester monomer (IIIc). Independent claims are also included for: (1) a one or two-component developer comprising the toner and optionally a carrier; (2) a container containing the developer; (3) an image forming method comprising: (i) forming an electrostatic latent image on a substrate; (ii) developing the image with the developer (iii) transferring the toner image onto a receiving material; and (iv) fixing the toner image on the material with application of heat; (4) a color image forming method comprising: (i) developing electrostatic latent images formed on several substrates with several of the color developers, each comprising a different color toner; and (ii) transferring the color toner images onto a receiving material one at a time with a transfer means, while pressing the receiving material against each of the substrates; (5) an image forming apparatus comprising: (i) an irradiator for irradiating a substrate means to form an electrostatic latent; (ii) an image developer to develop the image with a developer to form a toner image; (iii) a transfer means to transfer the toner image onto a receiving material; (iv) a fixing means to fix the toner image on the receiving material upon application of heat; and (v) a container to contain the developer; and (6) a color image forming apparatus comprising: (i) an image developer comprising several developing portions each comprising a different color developer comprising a toner, configured to develop electrostatic latent images formed on several substrates with the color developers to form a different color toner image on each of the substrates; and (ii) a transfer means to transfer the color toner images onto a receiving material sequentially while pressing the receiving material against each of the substrates.

5. 发明专利

DE60233197D1 未知
公开(公告)号：DE60233197D1
公开(公告)日：2009-09-17
申请号：DE60233197
申请日：2002-10-23
申请人： RICOH KK
发明人： OGIYAMA HIROMI , KATOH KOHKI , SUGINO AKIHIRO , TAKAHASHI MITSURU , KAWAGOE KATSUYA , SAWAI YUJI
IPC分类号： G03G15/16
摘要： A transfer device (10) transfers a visual image from an image carrier (8) to a recording medium (S). The transfer device (10) includes a first transfer element (10a) that moves and receives the visual image from the image carrier (8) on a first surface of the first transfer element (10a), a second transfer element (3) provided opposite to the first surface of the first transfer element (10a) to pinch and convey the recording medium (S) through a transfer nip part formed between the first surface of the first transfer element (10a) and the second transfer element (3), and a facing member (2,12,22,32) provided on a second surface of the first transfer element (10a) opposite to the first surface of the first transfer element (10a). The facing member (2,12,22,32) faces the second transfer element (3) via the first transfer element (10a). The transfer device (10) further includes a constant-current power supply (4) that applies an electric voltage to a voltage application electrode (2a,12a,22a,32a) such that the visual image on the first surface of the first transfer element (10a) is transferred to the recording medium (S). The voltage application electrode is included in the facing member or in the second transfer element. A constant-current controller (11) controls a current which flows due to the electric voltage, to be constant.

6. 发明专利

DE60211995T2 未知
公开(公告)号：DE60211995T2
公开(公告)日：2007-01-25
申请号：DE60211995
申请日：2002-04-02
申请人： RICOH KK
发明人： FUSHIMI HIROYUKI , NANYA TOSHIKI , UCHINOKURA OSAMU , YAGI SHINICHIRO , KATOH KOHKI
IPC分类号： G03G9/087 , G03G9/097
摘要： A toner comprises a polyester binder resin which does not contain a tetrahydrofuran-insoluble compound, a colorant, and a charge controlling agent. The binder has molecular weight distribution peak at 3,000-9,000. The charge controller has units derived from sulfonate group-containing monomers, electron acceptor group-containing aromatic monomers , and (meth)acrylic ester monomers. A toner comprises: (I) a binder resin which does not contain a tetrahydrofuran-insoluble compound, and comprises a polyester resin which: (a) contains = 4 wt.% of components having a molecular weight of = 500; and (b) has a molecular weight distribution peak at 3,000-9,000 (according to gel permeation chromatography); (II) a colorant; and (III) a charge controlling agent comprising a resin containing units obtained from: (a) a sulfonate group-containing monomer (IIIa); (b) an aromatic monomer having an electron acceptor group (IIIb); and (c) an acrylic ester and/or a methacrylic ester monomer (IIIc). Independent claims are also included for: (1) a one or two-component developer comprising the toner and optionally a carrier; (2) a container containing the developer; (3) an image forming method comprising: (i) forming an electrostatic latent image on a substrate; (ii) developing the image with the developer (iii) transferring the toner image onto a receiving material; and (iv) fixing the toner image on the material with application of heat; (4) a color image forming method comprising: (i) developing electrostatic latent images formed on several substrates with several of the color developers, each comprising a different color toner; and (ii) transferring the color toner images onto a receiving material one at a time with a transfer means, while pressing the receiving material against each of the substrates; (5) an image forming apparatus comprising: (i) an irradiator for irradiating a substrate means to form an electrostatic latent; (ii) an image developer to develop the image with a developer to form a toner image; (iii) a transfer means to transfer the toner image onto a receiving material; (iv) a fixing means to fix the toner image on the receiving material upon application of heat; and (v) a container to contain the developer; and (6) a color image forming apparatus comprising: (i) an image developer comprising several developing portions each comprising a different color developer comprising a toner, configured to develop electrostatic latent images formed on several substrates with the color developers to form a different color toner image on each of the substrates; and (ii) a transfer means to transfer the color toner images onto a receiving material sequentially while pressing the receiving material against each of the substrates.

7. 发明专利

DE60123732D1 未知
公开(公告)号：DE60123732D1
公开(公告)日：2006-11-23
申请号：DE60123732
申请日：2001-11-19
申请人： RICOH KK
发明人： SAWADA TOYOSHI , SUZUKI MASANORI , KATOH KOHKI , WATANABE YOHICHIROH , YAMASHITA MASAHIDE , KOTSUGAI AKIHIRO , SHIRAISHI KEIKO
IPC分类号： G03G9/083 , G03G9/08 , G03G9/087 , G03G9/09 , G03G9/097

8. 发明专利

DE60114933D1 未知
公开(公告)号：DE60114933D1
公开(公告)日：2005-12-22
申请号：DE60114933
申请日：2001-06-26
申请人： RICOH KK
发明人： WATANABE YOHICHIROH , SUZUKI MASANORI , YAMASHITA MASAHIDE , SHIRAISHI KEIKO , WATANABE KAZUHITO , KATOH KOHKI , SAWADA TOYOSHI , SAITO TAKUYA
IPC分类号： G03G9/08 , G03G9/087 , G03G9/09 , G03G15/20

9. 发明专利

DE60123732T2 未知
公开(公告)号：DE60123732T2
公开(公告)日：2007-08-16
申请号：DE60123732
申请日：2001-11-19
申请人： RICOH KK
发明人： SAWADA TOYOSHI , SUZUKI MASANORI , KATOH KOHKI , WATANABE YOHICHIROH , YAMASHITA MASAHIDE , KOTSUGAI AKIHIRO , SHIRAISHI KEIKO
IPC分类号： G03G9/083 , G03G9/08 , G03G9/087 , G03G9/09 , G03G9/097

10. 发明专利

DE60216014T2 未知
公开(公告)号：DE60216014T2
公开(公告)日：2007-07-05
申请号：DE60216014
申请日：2002-07-11
申请人： RICOH KK
发明人： TAKAHASHI MITSURU , SAWAI YUUJI , OGIYAMA HIROMI , KAWAGOE KATSUYA , SUGINO AKIHIRO , KATOH KOHKI
IPC分类号： G03G9/08 , G03G15/16 , G03G15/01 , G03G15/08
摘要： An image forming apparatus includes a cleaning device (9) for cleaning an intermediate image transfer body (4). A cleaning blade included in the image transfer body cleaning device is formed of fluorocarbon resin or a thin layer of fluorocarbon resin is formed on the surface of the intermediate image transfer body. Further, wax is coated on the intermediate image transfer body or wax or lubricant powder is contained in toner. A moving mechanism holds the cleaning blade spaced from the intermediate image transfer body at least when image formation is not under way.

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