Regulation Member Step Height Control for Toner Leakage Prevention
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Solution Overview
Problem
Existing electrophotographic image forming apparatuses face issues with toner leakage due to gaps between the regulation member and the developing frame member, leading to inconsistent image quality and potential contamination.
Innovation Solution
A developing device with a regulation member that includes an opposed surface and a contact surface, where the contact surface protrudes from the opposed surface, and an end seal is used to seal the gaps between the frame member, developer bearing member, and regulation member, with a step height of greater than or equal to 0 mm and not greater than 0.10 mm in the sealing area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If end seals are used to seal gaps between the regulation member and the developing frame member, then toner leakage is prevented, but the step height between the opposed surface and contact surface must be precisely controlled to avoid image defects
Solution Approach 1:
The patent specifies a precise parameter range for the step height (greater than or equal to 0 mm and not greater than 0.10 mm) to optimize both toner retention and image quality. This parameter control resolves the contradiction by defining the exact dimensional tolerance needed to prevent toner leakage while avoiding image defects.
Solution Approach 2:
The regulation member is designed with different surface characteristics in different areas: the contact surface has a specific protrusion height for image forming, while the sealing area has a controlled step height for toner retention. This local differentiation resolves the contradiction by optimizing each area for its specific function.
2Manufacturing precision
If the contact surface protrudes from the opposed surface to regulate toner layer thickness, then image quality is improved, but toner leakage occurs at the gaps between the regulation member and frame member
Solution Approach 1:
The regulation member is segmented into distinct functional areas: the contact surface area for toner regulation with protruding features, and the sealing area with controlled step heights. This segmentation allows each area to perform its specific function optimally without interfering with the other, resolving the contradiction between toner layer uniformity and toner retention.
Solution Approach 2:
Different regions of the regulation member have different geometries: the contact surface has a protrusion for precise toner layer control, while the sealing area has a controlled step height for toner containment. This local quality differentiation resolves the contradiction by making each area specialized for its intended function.
3Reliability
If the step height between the opposed surface and contact surface is increased to prevent toner leakage, then toner retention improves, but leading edge density stability deteriorates
Solution Approach 1:
The patent identifies an optimal parameter range for step height (greater than or equal to 0 mm and not greater than 0.10 mm) that balances toner retention and leading edge density stability. This parameter optimization resolves the contradiction by finding the precise dimensional tolerance that satisfies both requirements simultaneously.
Data Source
AI summary
A regulation member includes an opposed surface and a contact surface in a portion corresponding to an image forming area. The opposed surface is opposed to a developer bearing member. The contact surface protrudes from the opposed surface and has a height different from that of the opposed surface. An end seal seals a gap between a frame body, the developer bearing member, and the regulation member. The regulation member further includes an area not having the contact surface between the image forming area and a sealing area in which the regulation member and the end seal overlap. In the sealing area, a step between the opposed surface and the contact surface has a height of greater than or equal to 0 mm and not greater than 0.10 mm.