Charging roller with curved roller surface
AssigneeHewlett-Packard Development Company, L.P.
InventorNoriaki Kuroda
Life of this patent
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Abstract
A charging roller has a curved roller surface, and the shape of the roller surface is represented by Y/Y1=(X/X1)exp(α). A distance between a central portion of the roller body and a first arbitrary point on a rotation axis is denoted by X, a reduction in a radius at the first arbitrary point from the maximum radius at the central portion is denoted by Y, a distance between the central portion and a second arbitrary point on the rotation axis is denoted by X1, and a reduction in the radius at the second arbitrary point from the maximum radius at the central portion is denoted by Y1. The second arbitrary point is closer to an end portion of the roller body than the first arbitrary point.
Claims17
A charging roller, comprising:
- a roller body having a curved roller surface,
- a radius from a rotation axis of the roller body to the roller surface becomes maximum at a central portion of the roller body and is reduced toward an end portion of the roller body, and
- the shape of the roller surface is represented by Y/Y1=(X/X1)exp(α), and:
- α is a constant in the range of 1.5 to 2.5;
- X is a distance between the central portion and a first arbitrary point on the rotation axis;
- Y is a reduction in the radius at the first arbitrary point from the maximum radius at the central portion;
- X1 is a distance between the central portion and a second arbitrary point on the rotation axis, the second arbitrary point being closer to the end portion of the roller body than the first arbitrary point;
- and
- Y1 is a reduction in the radius at the second arbitrary point from the maximum radius at the central portion.
A charging roller, comprising:
- a roller body having a curved roller surface,
- a radius from a rotation axis of the roller body to the roller surface becomes maximum at a central portion of the roller body and is reduced toward an end portion of the roller body,
- a distance between the central portion and a first arbitrary point on the rotation axis is Z,
- a first portion of the roller surface having a first shape is provided in a direction along the rotation axis at a distance less than Z from the central portion and a second portion of the roller surface having a second shape is provided in the direction along the rotation axis at a distance greater than Z,
- the first shape of the first portion of the roller surface is defined by when a distance between the central portion and a second arbitrary point on the rotation axis is X, a distance between the central portion and a third arbitrary point on the rotation axis is X1, and the first arbitrary point is between the second arbitrary point and the third arbitrary point along the rotation axis,
- the first shape of the first portion of the roller surface is further defined by YA/YA1=(X/X1)exp(α1), wherein a reduction in the radius at the second arbitrary point from the maximum radius at the central portion is YA, and a reduction in the radius at the third arbitrary point from the maximum radius at the central portion is YA1, and
- α1 is a constant in a range of 1.5 to 2.5.
Dependencies are inferred from the claim text.