Intermediate Transfer Belt Resistance Control for Image Defects
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Image forming apparatuses with intermediate transfer belts face issues with image defects due to inadequate primary transferability, particularly caused by discharge currents and potential memory phenomena, which affect the quality of printed images.
Innovation Solution
An image forming apparatus with an intermediate transfer belt having a three-layer configuration, including a base layer, an inner surface layer, and a surface layer, where the volume resistance value (Rv) is greater than the first surface resistance value (Rs1) and the second surface resistance value (Rs2) is greater than Rs1, with Rs2/Rv ≤ 40, to control the primary transfer current paths and prevent discharge currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a low resistance layer is formed on the inner circumferential surface of the base layer to improve primary transferability, then transfer efficiency is improved, but discharge currents and potential memory phenomena occur causing image defects
Solution Approach 1:
The intermediate transfer belt is divided into three distinct layers: a base layer, an inner surface layer with lower resistance (Rs1) for efficient charge transfer, and an outer surface layer with higher resistance (Rs2) to suppress discharge currents and potential memory phenomena. This segmentation allows each layer to perform its specific function independently, resolving the contradiction between transfer efficiency and image quality.
Solution Approach 2:
Different regions of the intermediate transfer belt are assigned different resistance characteristics: the inner surface layer has low resistance (Rs1) optimized for primary transfer from the photosensitive drum, while the outer surface layer has high resistance (Rs2) optimized for preventing discharge during secondary transfer. This local differentiation of properties allows simultaneous optimization of both transfer efficiency and discharge suppression.
2Productivity
If the volume resistance value (Rv) is reduced to enhance charge transfer efficiency, then primary transferability is improved, but potential memory phenomena increase causing image defects
Solution Approach 1:
The resistance characteristics are segmented across different layers: the base layer has moderate volume resistance (Rv) for adequate charge storage, the inner surface layer has low surface resistance (Rs1) for efficient charge transfer to the photosensitive drum, and the outer surface layer has high surface resistance (Rs2) to prevent discharge currents and potential memory effects during secondary transfer.
Solution Approach 2:
Different resistance properties are assigned to different spatial locations and depths within the intermediate transfer belt structure. The inner surface layer provides low resistance contact with the photosensitive drum for efficient primary transfer, while the outer surface layer provides high resistance contact with the recording medium to suppress discharge and potential memory phenomena during secondary transfer.
3Reliability
If a three-layer structure is implemented to control current paths, then image quality is improved, but device complexity increases
Solution Approach 1:
The intermediate transfer belt is constructed as a three-layer composite structure with distinct functional zones: the base layer provides structural support and charge storage, the inner surface layer enables efficient primary transfer with low resistance (Rs1), and the outer surface layer suppresses discharge with high resistance (Rs2). This segmentation allows a relatively simple single-component design that achieves complex functionality through layered architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively suppresses image defects by ensuring efficient primary transferability and preventing potential memory phenomena, resulting in high-quality images with reduced discharge trails and transfer failures.
Implementation Method 1
Rv (Ω) is a volume resistance value of the intermediate transfer belt in a thickness direction, Rs1 (Ω) is a first surface resistance value of the inner surface layer side in a surface direction, and Rs2 (Ω) is a second surface resistance value on the surface layer side in a surface direction
Implementation Method 2
the intermediate transfer belt is endless and conductive and includes a base layer, a surface layer formed on an outer circumferential surface side of the base layer, and an inner surface layer formed on an inner circumferential surface side of the base layer
Data Source
AI summary
An image forming apparatus includes an image bearing member, an intermediate transfer belt, and a contact member. The intermediate transfer belt includes a base layer, a surface layer formed on an outside of the base layer, and an inner surface layer formed on an inner side of the base layer. A position at which the contact member and the intermediate transfer belt contact is arranged on a downstream side of the intermediate transfer belt in a rotation direction of the intermediate transfer belt. Rv>Rs1 and Rs2>Rs1, and Rs2/Rv≤40 are satisfied where Rv (Ω) is a volume resistance value of the intermediate transfer belt in a thickness direction, Rs1 (Ω) is a first surface resistance value of the inner surface layer side in a surface direction, and Rs2 (Ω) is a second surface resistance value on the surface layer side in a surface direction.