Image forming apparatus with high-resistance layer and voltage application unit
An image forming apparatus includes a transfer member that has a core and a high-resistance layer; a facing member that is arranged to face the transfer member so as to sandwich an object to be transferred in cooperation with the transfer member; a contact member that is arranged so as to be capable of contacting the transfer member; and a voltage application unit that applies a voltage between the contact member and the facing member, to pass a transfer current between the transfer member and the facing member, such that the core is electrically floated.
1. An image forming apparatus comprising:
a transfer member that has a core and a high-resistance layer;
a facing member that is arranged to face the transfer member so as to sandwich an object to be transferred in cooperation with the transfer member;
a contact member that is arranged so as to be capable of contacting the transfer member; and
a voltage application unit that applies a voltage between the contact member and the facing member, to pass a transfer current between the transfer member and the facing member, such that the core is electrically floated, wherein
the contact member is placed at a position opposing the facing member.
2. The image forming apparatus according to claim 1 ,
wherein the transfer member having an elastic layer, and the high-resistance layer is provided on a surface of the elastic layer.
3. The image forming apparatus according to claim 2 ,
wherein the diameter of the core is 5 mm to 30 mm, and the thickness of the high-resistance layer is 0.001 to 1 mm.
4. The image forming apparatus according to claim 2 ,
wherein the elastic layer contains foamed polyurethane.
5. The image forming apparatus according to claim 2 ,
wherein the contact member is a columnar conductive member that rotates to follow the rotation with the transfer member, and has conductivity.
6. The image forming apparatus according to claim 1 ,
wherein the diameter of the core is 5 mm to 30 mm, and the thickness of the high-resistance layer is 0.001 to 1 mm.
7. The image forming apparatus according to claim 1 ,
wherein the high-resistance layer contains polyamide.
8. The image forming apparatus according to claim 1 ,
wherein the contact member is a columnar conductive member that rotates to follow the rotation with the transfer member, and has conductivity.
9. The image forming apparatus according to claim 1 ,
wherein the core is not grounded.
10. The image forming apparatus according to claim 1 , wherein a material used to form core of the transfer member is SUS.
11. The image forming apparatus according to claim 1 , wherein the high-resistance layer of the transfer member has voltage dependability.