Changing member having a charging surface arranged with respect to a tangent line

A process cartridge, detachable to an image forming apparatus, said process cartridge comprising:

• a movable image bearing member;
• and
• a charging member, adjacent to said image bearing member, for charging said image bearing member, an oscillating voltage being applied to said charging member,
• said charging member having a charging surface arranged at a same side of a tangent line as said image bearing member wherein the tangent line extends from a point on said charging member, the point being a most downstream point in a moving direction of said image bearing member at a closest portion between said charging member and said image bearing member, toward a downstream side in the moving direction of said image bearing member.

An image forming apparatus, comprising:

• a movable image bearing member;
• and
• a charging member, adjacent to said image bearing member, for charging said image bearing member, an oscillating voltage being applied to said charging member,
• said charging member having a charging surface arranged at a same side of a tangent line as said image bearing member wherein the tangent line extends from a point on said charging member, the point being a most downstream point in a moving direction of said image bearing member at a closest portion between said charging member and said image bearing member, toward a downsteam side in the moving direction of said image bearing member.

A charging device, comprising:

• a movable member to be charged;
• and
• a charging member for charging said movable member, an oscillating voltage being applied to said charging member,
• wherein said charging member includes a first region for charging said movable member, and a second region provided at a downstream side in a moving direction of said movable member for charging said movable member, and wherein a distance between a surface of said charging member and a surface of said movable member is greater at said second region than at said first region, and with one of (i) said second region being substantially parallel to a tangent line of said movable member drawn from a point on said movable member being closest to said second region and (ii) said second region providing a substantially same curve as a curve of said movable member to which said second region faces.

A process cartridge detachable to an image forming apparatus, said process cartridge comprising:

• a movable image bearing member;
• and
• a charging member for charging said image bearing member, an oscillating voltage being applied to said charging member,
• wherein said charging member includes a first region for charging said image bearing member, and a second region provided at a downstream side in a moving direction of said image bearing member for charging said image bearing member, and wherein a distance between a surface of said charging member and a surface of said image bearing member is greater at said second region than at said first region, and with one of (i) said second region being substantially parallel to a tangent line of said image bearing member drawn from a point on said image bearing member being closest to said second region, and (ii) said second region providing a substantially same curve as a curve of said image bearing member to which said second region faces.

An image forming apparatus, comprising:

• a movable image bearing member;
• and
• a charging member for charging said image bearing member, an oscillating voltage being applied to said charging member,
• wherein said charging member includes a first region for charging said image bearing member, and a second region provided at a downstream side in a moving direction of said image bearing member for charging said image bearing member, and wherein a distance between a surface of said charging member and a surface of said image bearing member is greater at said second region that at said first region, and with one of (i) said second region being substantially parallel to a tangent line of said image bearing member drawn from a point on said image bearing member being closest to said second region, and (ii) said second region providing a substantially same curve as a curve of said image bearing member to which said second region faces.

A charging device, comprising:

• a movable member to be charged;
• and
• a charging member, adjacent to said movable member, for charging said movable member, an oscillating voltage being applied to said charging member,
• wherein said charging member includes a first charging region, and a second charging region provided at a downstream side from said first charging region in a moving direction of said movable member, and wherein a peak-to-peak voltage of unevenness in charging of a potential of said first charging region is greater than a peak-to-peak voltage of unevenness in charging of a potential of said second charging region.

A process cartridge, detachable to an image forming apparatus, said process cartridge comprising:

• a movable image bearing member;
• and
• a charging member adjacent to said image bearing member, for charging said image bearing member, an oscillating voltage being applied to said charging member,
• wherein said charging member includes a first charging region, and a second charging region provided at a downstream side from said first charging region in a moving direction of said image bearing member, and wherein a peak-to-peak voltage of unevenness in charging of a potential of said first charging region is greater than a peak-to-peak voltage of unevenness in charging of a potential of said second charging region.

An image forming apparatus, comprising:

• a movable image bearing member;
• and
• a charging member adjacent to said image bearing member, for charging said image bearing member, an oscillating voltage being applied to said charging member,
• wherein said charging member includes a first charging region, and a second charging region provided at a downstream side from said first charging region in a moving direction of said image bearing member, and wherein a peak-to-peak voltage of unevenness in charging of a potential of said first charging region is greater than a peak-to-peak voltage of unevenness in charging of a potential of said second charging region.