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US 9,316,957 B2Granted
Transfer device and image forming apparatus
AssigneeFuji Xerox Co., Ltd.
InventorTomoaki Yoshioka
Life of this patent
Estimating the term…
Abstract
A transfer device includes a transfer member provided so as to be able to revolve, and a voltage application unit. The transfer member has an upper layer and a lower layer arranged in a thickness direction, the upper layer has a larger volume resistivity than the lower layer. The transfer member receives a developer image transferred from an image bearing member to the upper layer at a first transfer portion and transfers the developer image to a recording medium at a second transfer portion. The voltage application unit applies an alternating-current voltage having a polarity that alternates in a moving direction of the transfer member to the transfer member, between the second transfer portion and the first transfer portion.
Claims8
A transfer device comprising:
- a transfer member provided so as to be able to revolve;
- and
- a voltage application unit,
- wherein the transfer member has an upper layer and a lower layer arranged in a thickness direction, the upper layer has a larger volume resistivity than the lower layer,
- wherein the transfer member receives a developer image transferred from an image bearing member to the upper layer at a first transfer portion and transfers the developer image to a recording medium at a second transfer portion, and
- wherein the voltage application unit applies an alternating-current voltage having a polarity that alternates in a moving direction of the transfer member to the transfer member, between the second transfer portion and the first transfer portion,
- wherein the voltage application unit includes two electrode members that are provided at a distance from each other in the moving direction of the transfer member and that are in contact with the transfer member, and a power supply that applies an alternating-current voltage across the two electrode members via the transfer member,
- wherein the transfer member is an endless belt,
- wherein the two electrode members include a first auxiliary electrode member that is in contact with the lower layer or upper layer of the belt, at a position downstream of the second transfer portion in the moving direction of the transfer member, and a second auxiliary electrode member that is in contact with the lower layer or upper layer of the belt, at a position downstream of the first auxiliary electrode member in the moving direction of the transfer member,
- wherein the first auxiliary electrode member is closer than other members that are in contact with the lower layer or upper layer of the belt, at a position downstream of the second transfer portion in the moving direction of the transfer member.
7 more elements
An image forming apparatus comprising:
- an image bearing member;
- a transfer member provided so as to be able to revolve;
- and
- a voltage application unit,
- wherein the transfer member has an upper layer and a lower layer arranged in a thickness direction, the upper layer has a larger volume resistivity than the lower layer,
- wherein the transfer member receives a developer image transferred from the image bearing member to the upper layer at a first transfer portion and transfers the developer image to a recording medium at a second transfer portion, and
- wherein the voltage application unit applies an alternating-current voltage having a polarity that alternates in a moving direction of the transfer member to the transfer member, between the second transfer portion and the first transfer portion,
- wherein the voltage application unit includes two electrode members that are provided at positions adjacent each other along the transfer member and at a distance from each other in the moving direction of the transfer member and that are in contact with the transfer member, and a power supply that applies an alternating-current voltage across the two electrode members via the transfer member.
5 more elements
A transfer device comprising:
- a transfer member provided so as to be able to revolve;
- and
- a voltage application unit,
- wherein the transfer member has an upper layer and a lower layer arranged in a thickness direction, the upper layer has a larger volume resistivity than the lower layer,
- wherein the transfer member receives a developer image transferred from an image bearing member to the upper layer at a first transfer portion and transfers the developer image to a recording medium at a second transfer portion, and
- wherein the voltage application unit applies an alternating-current voltage having a polarity that alternates in a moving direction of the transfer member to the transfer member, between the second transfer portion and the first transfer portion,
- wherein the voltage application unit includes a first electrode and a second electrode that are provided at a distance from each other in the moving direction of the transfer member and that are in contact with the transfer member, and the voltage application unit provides an alternating-current voltage to the second electrode, the second electrode being disposed in contact with the lower layer of the transfer member.
4 more elements
Dependencies are inferred from the claim text.