Claims
- 1. An image forming apparatus comprising:
- a primary transfer unit which sequentially transfers toner images of different colors from a photoconductive element to an intermediate transfer belt to thereby form a composite color image on said intermediate transfer belt;
- a secondary transfer unit which transfers the composite toner image from said intermediate transfer belt to a recording medium, and including a secondary transfer belt extending in a direction of transport in which the recording medium is conveyed, and a secondary transfer element facing an inner periphery of said secondary transfer belt;
- two secondary transfer rollers facing an inner periphery of said intermediate transfer belt and spaced by a preselected distance in the direction of transport, and wherein said intermediate transfer belt between said two secondary transfer rollers indirectly contacts the secondary transfer belt through the composite toner image; and
- a bias applying unit positioned downstream of a downstream one of the two secondary transfer rollers;
- wherein said intermediate transfer belt is formed of a material having a volume resistivity of 10.sup.8 .OMEGA.cm to 10 .sup.10 .OMEGA.cm, and wherein said secondary transfer belt is formed of a material having a volume resistivity higher than 10.sup.11 .OMEGA.cm inclusive.
- 2. An apparatus as claimed in claim 1, wherein said secondary transfer element comprises a conductive brush.
- 3. An apparatus as claimed in claim 1, wherein said secondary transfer element comprises a conductive roller.
- 4. An image forming apparatus comprising:
- a primary transfer means for sequentially transferring toner images of different colors from a photoconductive means to an intermediate transfer means to thereby form a composite color image on said intermediate transfer means;
- means for transferring the composite toner image from said intermediate transfer means to a recording medium, and including a secondary transfer belt extending in a direction of transport in which the recording medium is conveyed, and secondary transfer means facing an inner periphery of said secondary transfer belt;
- two secondary transfer rollers facing an inner periphery of said intermediate transfer belt and spaced by a preselected distance in the direction of transport, and wherein said intermediate transfer belt between said two secondary transfer rollers indirectly contacts the secondary transfer belt through the composite toner image; and
- a bias applying unit positioned downstream of a downstream one of the two secondary transfer rollers;
- wherein said intermediate transfer means is formed of a material having a volume resistivity of 10.sup.8 .OMEGA.cm to 10.sup.10 .OMEGA.cm, and wherein said secondary transfer belt is formed of a material having a volume resistivity higher than 10.sup.10 .OMEGA.cm inclusive.
- 5. An apparatus as claimed in claim 4, wherein said secondary transfer means comprises a conductive brush.
- 6. An apparatus as claimed in claim 4, wherein said secondary transfer means comprises a conductive roller.
Priority Claims (4)
Number |
Date |
Country |
Kind |
8-106088 |
Apr 1996 |
JPX |
|
8-106089 |
Apr 1996 |
JPX |
|
8-207696 |
Jul 1996 |
JPX |
|
8-215925 |
Jul 1996 |
JPX |
|
Parent Case Info
This application is a Continuation of application Ser. No. 08/831,018, filed on Mar. 31, 1997 now U.S. Pat. No. 5,873,017.
US Referenced Citations (11)
Continuations (1)
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Number |
Date |
Country |
Parent |
831018 |
Mar 1997 |
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