Image formation apparatus

An image formation apparatus comprising:

• a first electrode portion including a contact electrode and a counter electrode, the contact electrode being in contact with a transported recording medium, the counter electrode being arranged to be opposed to the contact electrode such that the transported recording medium lies between the contact electrode and the counter electrode;
• a second electrode portion arranged as not being in contact with the recording medium such that charges applied to the recording medium are movable;
• a first sensing unit configured to sense a first current which flows to the first electrode portion as a result of application of a voltage across the contact electrode and the counter electrode while the recording medium lies between the contact electrode and the counter electrode;
• a second sensing unit configured to sense a second current which flows from the charged recording medium to the second electrode portion;
• and
• a control unit configured to receive input of results of sensing by the first sensing unit and the second sensing unit, the control unit being configured to set a transfer condition for transferring a toner image to the recording medium based on the first current sensed by the first sensing unit and the second current sensed by the second sensing unit,
• wherein the control unit is configured to calculate an electrical resistance and a capacitance of the recording medium based on the sensed first current and the sensed second current, and to raise a transfer voltage to be applied to the transfer apparatus in transfer of the toner image from a toner image carrier to the recording medium when the estimated electrical resistance of the recording medium is high and to lower the transfer voltage when the capacitance of the recording medium is high.

An image formation apparatus comprising:

• a first electrode portion including a contact electrode and a counter electrode, the contact electrode being in contact with a transported recording medium, the counter electrode being arranged to be opposed to the contact electrode such that the transported recording medium lies between the contact electrode and the counter electrode;
• a second electrode portion arranged as not being in contact with the recording medium such that charges applied to the recording medium are movable;
• a first sensing unit configured to sense a first current which flows to the first electrode portion as a result of application of a voltage across the contact electrode and the counter electrode while the recording medium lies between the contact electrode and the counter electrode;
• a second sensing unit configured to sense a second current which flows from the charged recording medium to the second electrode portion;
• a control unit configured to receive input of results of sensing by the first sensing unit and the second sensing unit, the control unit being configured to set a transfer condition for transferring a toner image to the recording medium based on the first current sensed by the first sensing unit and the second current sensed by the second sensing unit;
• and
• a cooling apparatus configured to cool the recording medium after the toner image transferred to the recording medium is fixed, wherein
• the control unit is configured to set a cooling condition of the cooling apparatus based on the first current sensed by the first sensing unit and the second current sensed by the second sensing unit.