Insulation Layer for Liquid Electrophotography Roller
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Solution Overview
Problem
In liquid electrophotography, the transfer of printing liquid between rollers is inefficient due to electrical discharge, leading to suboptimal image formation and quality on substrates.
Innovation Solution
The use of an insulation layer on key members of the liquid electrophotography apparatus, such as the developer roller and photoconductive drum, prevents electrical discharge, allowing for improved transfer and retention of printing liquid, thereby enhancing image quality and pattern precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If printing liquid is transferred between rollers without insulation layer, then electrical discharge occurs, but transfer efficiency and image quality deteriorate
Solution Approach 1:
An insulation layer is introduced as an intermediary component between the printing liquid and the roller surface. This insulation layer prevents direct electrical contact and discharge while allowing the printing liquid to be transferred effectively, thus resolving the contradiction between transfer efficiency and electrical discharge harm.
Solution Approach 2:
A thin film insulation layer is applied to the roller surface. This thin film structure provides electrical insulation to prevent discharge while maintaining the mechanical and transfer properties needed for efficient printing liquid transfer, addressing both the harmful electrical discharge and the need for reliable transfer.
2Manufacturing precision
If insulation layer is applied to prevent electrical discharge, then image quality improves, but device complexity increases
Solution Approach 1:
A thin film insulation layer is applied to the roller surface. This thin film structure provides electrical insulation to prevent discharge while maintaining the mechanical and transfer properties needed for efficient printing liquid transfer, addressing both the harmful electrical discharge and the need for reliable transfer.
Solution Approach 2:
The roller is constructed as a composite structure combining the original roller material with an insulation layer material. This composite approach integrates the insulation function directly into the roller component, improving image quality while minimizing the increase in overall device complexity.
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 solution enables high-quality printing of conducting and semiconducting patterns, graphical metallic images, and high-loaded carbon black ink on substrates by maintaining the printing liquid layer without electrical discharge, resulting in improved transfer efficiency and image quality.
Implementation Method 1
The photoconductor charging apparatus 14 includes an electrode that is arranged to electrically charge the exterior surface 28 of the photoconductive drum 12
Implementation Method 2
The printing liquid has an opposite electrical charge to the plurality of rollers and is therefore attracted to the plurality of rollers
Implementation Method 3
The spray assembly 18 is arranged to receive printing liquid from the container 16 and to provide the printing liquid to the developer roller 20
Implementation Method 4
The fuser 24 is positioned adjacent the intermediate roller 22 and is arranged to provide heat to the printing liquid on the intermediate roller 22 to transform the printing liquid into a plastic film
Data Source
AI summary
Liquid electrophotography apparatus including a plurality of members defining a flow path for a printing liquid. At least a first member of the plurality of members is arranged to generate an electric field. The liquid electrophotography apparatus also includes a first insulation layer arranged around at least a portion of a surface of the first member to prevent electrical discharge from the printing liquid.