Charging device, image forming process cartridge, and image forming apparatus including the charging device
AssigneeRicoh Company, Ltd.
InventorsTakahiko Tokumasu, Kenji Sugiura
Life of this patent
Estimating the term…
Abstract
A charging device includes a charging member which is applied with a voltage including an alternating current voltage superimposed on a direct current voltage to charge an image carrier. An equation of “7≦f/v≦17” is satisfied, where “f” is a frequency (Hz) of the alternating current voltage, and “v” is a moving speed (mm/sec) of the image carrier.
Claims34
A charging device comprising:
- a charging member configured to charge an image carrier, the charging member being applied with a voltage including an alternating current voltage superimposed on a direct current voltage,
- wherein a following relationship is satisfied:
- 7≦f/v≦17 (1)
- where “f” is a frequency (Hz) of the alternating current voltage, and “v” is a moving speed (mm/sec) of the image carrier.
An image forming process cartridge for use in a main body of an image forming apparatus, comprising:
- an image carrier configured to carry an image;
- and
- a charging member configured to charge the image carrier, the charging member being applied with a voltage including an alternating current voltage superimposed on a direct current voltage,
- wherein a following relationship is satisfied:
- 7≦f/v≦17 (1)
- where “f” is a frequency (Hz) of the alternating current voltage, and “v” is a moving speed (mm/sec) of the image carrier,
- wherein the image carrier and the charging member are integrally accommodated in the image forming process cartridge, and the image forming process cartridge is detachably attached to the main body of the image forming apparatus.
An image forming apparatus comprising:
- an image carrier configured to carry an image;
- and
- a charging device comprising a charging member configured to charge the image carrier, the charging member being applied with a voltage including an alternating current voltage superimposed on a direct current voltage,
- wherein a following relationship is satisfied:
- 7≦f/v≦17 (1)
- where “f” is a frequency (Hz) of the alternating current voltage, and “v” is a moving speed (mm/sec) of the image carrier.
An image forming process cartridge for use in a main body of an image forming apparatus, comprising:
- image carrying means for carrying an image;
- and
- charging means for charging the image carrying means, the charging means being applied with a voltage including an alternating current voltage superimposed on a direct current voltage,
- wherein a following relationship is satisfied:
- 7≦f/v≦17 (1)
- where “f” is a frequency (Hz) of the alternating current voltage, and “v” is a moving speed (mm/sec) of the image carrying means,
- wherein the image carrying means and the charging means are integrally accommodated in the image forming process cartridge, and the image forming process cartridge is detachably attached to the main body of the image forming apparatus.
An image forming apparatus comprising:
- image carrying means for carrying an image;
- and
- charging means for charging the image carrying means, the charging means being applied with a voltage including an alternating current voltage superimposed on a direct current voltage,
- wherein a following relationship is satisfied:
- 7≦f/v≦17 (1)
- where “f” is a frequency (Hz) of the alternating current voltage, and “v” is a moving speed (mm/sec) of the image carrying means.
Dependencies are inferred from the claim text.