Claims
- 1. An image transferring device incorporated in an image forming apparatus for transferring a toner image from an intermediate transfer member to a sheet, said device comprising:
- electric field forming means for forming an electric field for image transfer; and
- an electrode member connected to ground and located at a back portion of said intermediate transfer member which faces said electric field forming means, said electrode member having a resistance which causes a current fed from said electric field forming means to flow to ground, wherein said electrode member directly contacts a surface of said intermediate transfer member opposite to a surface which said electric field forming means contacts and at a position where said electrode member faces said electric field forming means.
- 2. A device as claimed in claim 1, wherein said electric field forming means comprises a metallic core connected to a bias power source, and an elastic member covering said metallic core and having a specific volume resistance of 10.sup.7 .OMEGA.cm to 10.sup.10 .OMEGA.cm.
- 3. A device as claimed in claim 1, wherein said intermediate transfer member comprises an intermediate transfer belt.
- 4. A device as claimed in claim 3, wherein said intermediate transfer belt has a specific volume resistance of 10.sup.7 .OMEGA.cm to 10.sup.12 .OMEGA.cm.
- 5. An image transferring device incorporated in an image forming apparatus for transferring a toner image from a toner image carrier to a sheet, said device comprising:
- electric field forming means for forming an electric field for image transfer; and
- an electrode member connected to ground and located at a back portion of said toner image carrier which faces said electric field forming means, said electrode member having a resistance which causes a current fed from said electric field forming means to flow to ground, wherein said electrode member contacts a surface of said toner image carrier opposite to a surface which said electric field forming means contacts and at a position where said electrode member faces said electric field forming means, wherein said electrode member has a specific volume resistance of 10.sup.7 .OMEGA.cm to 10.sup.12 .OMEGA.cm and, wherein said electrode member has a layer consisting only of polar rubber.
- 6. A device as claimed in claim 5, wherein said polar rubber comprises epichlorohydrin rubber.
- 7. An image transferring device incorporated in an image forming apparatus for transferring a toner image from a toner image carrier to a sheet, said device comprising:
- electric field forming means for forming an electric field for image transfer; and
- an electrode member connected to ground and located at a back portion of said toner image carrier which faces said electric field forming means, said electrode member having a resistance which causes a current fed from said electric field forming means to flow to ground, wherein said electrode member contacts a surface of said toner image carrier opposite to a surface which said electric field forming means contacts and at a position where said electrode member faces said electric field forming means, wherein said electrode member has a specific volume resistance of 10.sup.7 .OMEGA.cm to 10.sup.12 .OMEGA.cm and, wherein said electrode member has a layer in which conductive particles are dispersed.
- 8. An image transferring device incorporated in an image forming apparatus for transferring a toner image from an intermediate transfer member to a sheet, said device comprising:
- electric field forming means for forming an electric field for image transfer; and
- an electrode member connected to ground and located at a back portion of said intermediate transfer member which faces said electric field forming means, said electrode member having a resistance which prevents said electrode member from being charged by said electric field forming means, wherein said electrode member directly contacts a surface of said intermediate transfer member opposite to a surface which said electric field forming means contacts and at a position where said electrode member faces said electric field forming means.
- 9. An image transferring device incorporated in an image forming apparatus for transferring a toner image from a toner image carrier to a sheet, said device comprising:
- electric field forming means for forming an electric field for image transfer; and
- an electrode member connected to ground and located at a back portion of said toner image carrier which faces said electric field forming means, said electrode member having a resistance which prevents said electrode member from being charged by said electric field forming means, wherein said electrode member contacts a surface of said toner image carrier opposite to a surface which said electric field forming means contacts and at a position where said electrode member faces said electric field forming means, wherein said electrode member comprises an epichlorohydrin rubber layer.
- 10. An image transferring device incorporated in an image forming apparatus for transferring a toner image from a toner image carrier to a sheet, said device comprising:
- electric field forming means for forming an electric field for image transfer; and
- an electrode member connected to ground and located at a back portion of said toner image carrier which faces said electric field forming means, said electrode member having a resistance which prevents said electrode member from being charged by said electric field forming means, wherein said electrode member contacts a surface of said toner image carrier opposite to a surface which said electric field forming means contacts and at a position where said electrode member faces said electric field forming means, wherein said electrode member comprises a layer in which a conductive agent is dispersed.
- 11. An image transferring device incorporated in an image forming apparatus for transferring a toner image from a toner image carrier to a sheet, said device comprising:
- electric field forming means for forming an electric field for image transfer; and
- an electrode member connected to ground and located at a back portion of said toner image carrier which faces said electric field forming means, said electrode member having a specific volume resistance of 10.sup.7 .OMEGA.cm to 10.sup.12 .OMEGA.cm, wherein said electrode member contacts a surface of said toner image carrier opposite to a surface which said electrode field forming means contacts and at a position where said electrode member faces said electric field forming means.
- 12. An image transferring device incorporated in an image forming apparatus for transferring a toner image from an intermediate transfer member to a sheet, said device comprising:
- electric field forming means for forming an electric field for image transfer; and
- an electrode member connected to ground and located at a back portion of said intermediate transfer member which faces said electric field forming means, said electrode member having a resistance layer in which at least a conductive agent is not dispersed, wherein said electrode member directly contacts a surface opposite to a surface which said electric field forming means contacts and at a position where said electrode member faces said electric field forming means.
- 13. An image transferring device incorporated in an image forming apparatus for transferring a toner image from a toner image carrier to a sheet, said device comprising:
- electric field forming means for forming an electric field for image transfer; and
- an electrode member connected to ground and located at a back portion of said toner image carrier which faces said electric field forming means, said electrode member having a resistance layer in which at least a conductive agent is not dispersed, wherein said electrode member contacts a surface of said toner image carrier opposite to a surface which said electric field forming means contacts and at a position where said electrode member faces said electric field forming means, wherein said resistance layer is made of epichlorohydrin rubber.
Priority Claims (2)
Number |
Date |
Country |
Kind |
4-230254 |
Aug 1992 |
JPX |
|
5-155857 |
Jun 1993 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 08/111,943, filed on Aug. 26, 1993, now abandoned.
US Referenced Citations (12)
Continuations (1)
|
Number |
Date |
Country |
Parent |
111943 |
Aug 1993 |
|