Photoconductor Base Member Hardness Gradient for Deformation Control
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Solution Overview
Problem
Existing photoconductor units face challenges in maintaining a consistent developing gap and image density due to variations in the hardness and rigidity of the base member along the axial direction, leading to potential deformation and non-uniform image formation.
Innovation Solution
A photoconductor unit with a cylindrical base member having a hardness that decreases from one end to the other, featuring a flange with a ground plate attached to the higher hardness end, which is in contact with the inner peripheral surface, providing a stable grounding and reducing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the base member has uniform hardness throughout, then the manufacturing process is simple, but the photoconductor unit deforms due to insufficient rigidity at the open end portion
Solution Approach 1:
The base member is designed with non-uniform hardness distribution along its axial direction, with the open end portion having higher hardness than the other portions. This local quality variation provides enhanced rigidity and deformation resistance at the open end portion without requiring the entire base member to be manufactured with high hardness, thus balancing structural requirements with manufacturing feasibility.
2Ease of operation
If the electrode contacts the lower hardness portion of the base member, then the contact is easier to achieve, but the developing gap becomes non-uniform due to base member deformation
Solution Approach 1:
The electrode is specifically positioned to contact the open end portion of the base member, which has been engineered to have higher hardness and greater deformation resistance. This localized contact arrangement ensures both ease of electrode installation and maintenance of uniform developing gap, as the high-hardness region provides stable structural support.
3Stability of the object's composition
If the base member has high hardness throughout, then deformation is reduced, but the manufacturing complexity increases due to hardness gradient requirements
Solution Approach 1:
Instead of uniformly high hardness throughout the base member, the design implements a localized hardness increase only at the open end portion where it is most needed for deformation resistance. This approach maintains shape stability in the critical region while avoiding the manufacturing complexity and material waste associated with high-hardness treatment of the entire base member.
Data Source
AI summary
A photoconductor unit includes a photoconductor and an electrode. The photoconductor includes a base member that is cylindrical and has a hardness that decreases with increasing distance from a first end toward a second end in an axial direction, and a photosensitive layer formed on an outer peripheral surface of the base member. The electrode is in contact with an inner peripheral surface of an open end portion of the base member at the first end.