JP2007093922A5

JP2007093922A5 -

Info

Publication number: JP2007093922A5
Application number: JP2005282216A
Authority: JP
Filing date: 2005-09-28
Publication date: 2008-10-30
Anticipated expiration: 2025-09-28

Claims

An image carrier;
A rotatable charging means for charging the image carrier;
Voltage applying means for applying a plurality of alternating voltages having different peak-to-peak voltages to the charging means;
Current detection means for detecting an alternating current value flowing from the charging means to the image carrier;
In an image forming apparatus having
The AC voltage applied to the charging means is based on an AC voltage that provides an AC current value having a minimum value that is equal to or greater than a predetermined current value among the minimum values of the AC current values for the plurality of AC voltages. An image forming apparatus comprising: a determination unit that determines a peak-to-peak voltage.

An image carrier;
A rotatable charging means for charging the image carrier;
Voltage applying means for applying a plurality of alternating voltages having different peak-to-peak voltages to the charging means;
Current detection means for detecting an alternating current value flowing from the charging means to the image carrier;
In an image forming apparatus having
When the difference between the average value and the minimum value of the alternating current values for the plurality of alternating voltages is smaller than a predetermined value,
The AC voltage having a minimum peak-to-peak voltage among the AC voltages from which an AC current value having an average value equal to or greater than a predetermined current value among the average values of the AC current values for the plurality of AC voltages is obtained. On the basis of the control to determine the peak-to-peak voltage of the AC voltage applied to the charging means,
When the difference between the average value and the minimum value of the alternating current values for the plurality of alternating voltages is equal to or greater than the predetermined value,
The AC voltage having the minimum peak-to-peak voltage among the AC voltages from which an AC current value having a minimum value equal to or greater than a predetermined current value among the minimum values of the AC current values for the plurality of AC voltages is obtained. An image forming apparatus comprising: a determining unit that determines a peak-to-peak voltage of the AC voltage applied to the charging unit based on the above.

An image carrier;
A rotatable charging means for charging the image carrier;
Voltage applying means for applying a plurality of alternating voltages having different peak-to-peak voltages to the charging means;
Current detection means for detecting an alternating current value flowing from the charging means to the image carrier;
In an image forming apparatus having
When the information on the resistance unevenness on the surface of the charging means is smaller than a predetermined value, an alternating current value having an average value that is equal to or larger than the predetermined current value among the average values of the alternating current values for the plurality of alternating voltages is obtained. Based on the AC voltage having the minimum peak-to-peak voltage among the AC voltages, control is performed to determine the peak-to-peak voltage of the AC voltage applied to the charging means,
When the information regarding the resistance unevenness on the surface of the charging unit is equal to or greater than the predetermined value, an AC current value having a minimum value that is equal to or greater than the predetermined current value among the minimum values of the AC current values for the plurality of AC voltages is obtained. An image forming apparatus comprising: a determination unit that determines a peak-to-peak voltage of the AC voltage applied to the charging unit based on the AC voltage having a minimum peak-to-peak voltage among the AC voltages .

When a plurality of AC voltages are obtained from which an AC current value having a minimum value equal to or greater than the predetermined current value is obtained, the AC voltage is applied to the charging means based on the AC voltage having the minimum peak-to-peak voltage among them. The image forming apparatus according to claim 1, further comprising a determining unit that determines a peak-to-peak voltage of the AC voltage.

5. The image forming apparatus according to claim 1, wherein the voltage application unit includes a single step-up transformer capable of creating a bias in which an AC component and a DC component are superimposed.

The image forming apparatus according to claim 1, wherein the charging unit is a contact charging unit that performs charging by contacting with the image carrier.

The image forming apparatus according to claim 6, wherein the charging unit is a charging roller provided in contact with the image carrier.

Developing means for developing the electrostatic latent image into a developer image by a developer;
Transfer means for transferring the developer image to a transfer medium;
Cleaning means for cleaning the developer remaining on the image carrier after transfer;
8. The image forming apparatus according to claim 1, further comprising:

The image forming apparatus according to claim 2, further comprising a storage medium that stores the predetermined value.

The image forming apparatus according to claim 9, wherein the image carrier, the charging unit, and the storage medium are integrated into a process cartridge that is detachable from the main body of the image forming apparatus.

11. The charging device according to claim 1, wherein the charging unit is a charging roller, and the AC current values with respect to the plurality of AC voltages are detected for a time equal to or longer than a time during which the charging roller rotates once. Image forming apparatus.