Conductive Roll Intermediate Layer Poisson Ratio Optimization

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing conductive rolls in image forming apparatuses face challenges in maintaining the parallelism of images transferred to recording media due to limitations in the deformation and adjustment of the conductive roll's pushing amount, particularly when the Poisson ratio of the intermediate layer is greater than 0.40.

Innovation Solution

A conductive roll configuration with a support member, an elastic layer, an intermediate layer, and a surface layer, where the Poisson ratio of the intermediate layer is set to 0.40 or less, allowing for easier deformation and adjustment of the pushing amount to enhance image parallelism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If the Poisson ratio of the intermediate layer is greater than 0.40, then the structural stability is improved, but the ease of deformation and adjustment of pushing amount deteriorates

Engineering Contradiction:

Improvestructural stabilityVSAvoidease of deformation and adjustment

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The patent applies parameter changes by setting the Poisson ratio of the intermediate layer to 0.40 or less, which is a specific material property parameter. This parameter optimization enables the intermediate layer to deform more easily while maintaining sufficient structural stability, thus resolving the contradiction between stability and ease of deformation for adjusting the pushing amount of the conductive roll.

Inventive Principle:

Principle #35Parameter changes

2Force

If the pushing amount of the conductive roll is increased, then the image transfer pressure is improved, but the image parallelism deteriorates

Engineering Contradiction:

Improveimage transfer pressureVSAvoidimage parallelism

Core Design Contradiction:

ForceVSManufacturing precision

Solution Approach 1:

The patent applies dynamics by making the conductive roll's pushing amount adjustable rather than fixed. The intermediate layer with Poisson ratio of 0.40 or less enables dynamic adjustment of the pushing amount, allowing the system to optimize both image transfer pressure and image parallelism according to different operating conditions, thus resolving the contradiction between force and manufacturing precision.

Inventive Principle:

Principle #15Dynamics

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 increases the parallelism of images transferred to the recording medium by facilitating deformation and adjustment of the conductive roll's pushing amount, improving image formation accuracy.

Implementation Method 1

the intermediate layer having a Poisson ratio of 0.40 or less... allowing for easier deformation and adjustment of the pushing amount

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Data Source

PatentUS11513454B1Conductive roll, transfer device, process cartridge, and image forming apparatus for image transfer

Publication Date: 2022.11.29 FUJIFILM BUSINESS INNOVATION CORP

AI summary

A conductive roll includes a support member, an elastic layer disposed on an outer peripheral surface of the support member, a surface layer disposed on an outer peripheral surface of the elastic layer, and an intermediate layer disposed between the elastic layer and the surface layer, the intermediate layer having a Poisson ratio of 0.40 or less.