Corona discharge device
AssigneeMinolta Co., Ltd.
InventorsNoboru Yonekawa, Yasuhiro Nakagami, Kouji Matsushita
Life of this patent
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Abstract
A corona discharge device used in an electrophotographic image forming apparatus includes a discharge member such as a saw-toothed discharge member having sharp discharge ends, and a power supply which applies to the discharge member a discharge voltage containing at least an AC voltage component, wherein at least each discharge end portion of the discharge member is made of an electrically conductive material, which contains nickel and chromium, and/or is coated with a material having a high electric resistance. In the case where the saw-toothed discharge member is employed, a distance D between the discharge end and a member to be charged, and a discharge end pitch P are determined to satisfy a relationship of 2≦D/P≦8.
Claims20
A corona discharge device used in an electrophotographic image forming apparatus comprising:
- a discharge member having sharp discharge ends;
- and
- means for applying to said discharge member a discharge voltage containing at least an AC voltage component.
A corona discharge device used in an electrophotographic image forming apparatus comprising:
- a discharge member having sharp discharge ends, wherein at least each discharge end portion including said discharge end is coated with a material having a high electric resistance.
A corona discharge device used in an electrophotographic image forming apparatus comprising:
- a discharge member having a plurality of sharp discharge ends arranged in a row, wherein a distance D (mm) of a space between a discharge end and a charge receiving member to be charged in said image forming apparatus or between said discharge end and a path of said charge receiving member, and a pitch P (mm) between said discharge ends are determined to establish a relationship of 4≦D/P≦6.
A corona discharge device used in an electrophotographic image forming apparatus comprising:
- a discharge member having sharp discharge ends, wherein at least each discharge end portion including said discharge end is made of an electrically conductive material containing nickel in a range from 8% to 15% and chromium in a range from 16% to 20%, and is coated with a material having a high electric resistance.
Dependencies are inferred from the claim text.