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US 6,205,299 B1Granted
Image forming apparatus in which whether transfer member should be constant-current-controlled or constant-voltage-controlled is selected depending on thickness of transfer material
AssigneeCanon Kabushiki Kaisha
InventorsKensaku Kusaka, Satoshi Tomiki
Life of this patent
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Abstract
The present invention relates to an image forming apparatus in which current control means constant-current-controls a current value flowing in a transfer member so as to become constant, voltage control means constant-voltage-controls a voltage value applied to the transfer member so as to become constant, and selecting means selects a control of the transfer member during transfer to constant current control or constant voltage control in conformity with the thickness of the transfer material.
Claims6
An image forming apparatus comprising:
- an image bearing member bearing a toner image thereon;
- a transfer member cooperating with said image bearing member to form a nip for pinching a transfer material, and transferring the toner image on said image bearing member to the transfer material;
- current control means for constant-current-controlling a current value flowing in said transfer member so as to become constant;
- voltage control means for constant-voltage-controlling a voltage value applied to said transfer member so as to become constant;
- and
- selecting means for selecting a control of said transfer member during transfer to constant current control or constant voltage control in conformity with the thickness of the transfer material.
3 more elements
Dependencies are inferred from the claim text.