Charging Roll Composite Layers for Ozone-Reduced Photoreceptor Charging
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Solution Overview
Problem
Existing charging rolls in electrophotographic apparatuses face challenges in achieving sufficient photoreceptor charging without generating harmful substances like ozone and NOx, leading to environmental and image deterioration, due to imbalances in discharge amounts.
Innovation Solution
A charging roll design comprising an elastic body layer with non-polar and polar rubbers, carbon black, and a surface layer with fluororesin and (meth)acrylic resin, configured to specific permittivity and resistance values, reduces discharge and enhances charge movement, suppressing harmful substance generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the discharge amount is increased to sufficiently charge the photoreceptor, then the charging performance is improved, but harmful substances such as ozone and NOx are generated, leading to environmental deterioration and image deterioration
Solution Approach 1:
The patent changes the electrical parameters of the charging roll by controlling the resistance value (6.0×10^4Ω to 5.0×10^6Ω) and relative permittivity (7 to 29) of the elastic body layer, and the resistance value (1.2×10^4Ω to 8.8×10^5Ω) and relative permittivity (10 to 22) of the surface layer. These parameter optimizations enable sufficient charging with reduced discharge, suppressing harmful substance generation while maintaining charging performance
Solution Approach 2:
The patent uses composite materials with specific properties: the elastic body layer contains non-polar rubber, polar rubber, and carbon black, while the surface layer contains fluororesin and (meth)acrylic resin. This composite structure achieves the desired balance between charging performance and harmful substance reduction through the synergistic effects of different materials
2Object-generated harmful factors
If the discharge amount is decreased to reduce harmful substance generation, then environmental deterioration and image deterioration are suppressed, but the charge amount becomes insufficient, leading to image deterioration
Solution Approach 1:
The patent optimizes the resistance and permittivity parameters of both layers to achieve sufficient charge accumulation. The elastic body layer resistance (6.0×10^4Ω to 5.0×10^6Ω) and surface layer resistance (1.2×10^4Ω to 8.8×10^5Ω) are controlled to ensure adequate charge amount while reducing discharge-related harmful substance generation
Solution Approach 2:
The composite structure with non-polar rubber, polar rubber, carbon black in the elastic body layer, and fluororesin with (meth)acrylic resin in the surface layer creates a material system that simultaneously achieves low harmful substance generation and sufficient charging capability through the combined properties of its components
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
The design achieves excellent charging properties with reduced discharge, minimizing ozone and NOx production while ensuring uniform charge injection and improved durability.
Implementation Method 1
The elastic body layer contains a non-polar rubber, a polar rubber, and a carbon black, and has a relative permittivity of 7 or more and 29 or less and a resistance value of 6.0×10^4Ω or more and 5.0×10^6Ω or less. The surface layer contains a fluororesin and a (meth)acrylic resin, and has a relative permittivity of 10 or more and 22 or less and a resistance value of 1.2×10^4Ω or more and 8.8×10^5Ω or less.
Implementation Method 2
The elastic body layer contains a non-polar rubber, a polar rubber, and a carbon black, and has a relative permittivity of 7 or more and 29 or less and a resistance value of 6.0×10^4Ω or more and 5.0×10^6Ω or less. The surface layer contains a fluororesin and a (meth)acrylic resin, and has a relative permittivity of 10 or more and 22 or less and a resistance value of 1.2×10^4Ω or more and 8.8×10^5Ω or less.
Data Source
AI summary
A charging roll for electrophotographic apparatuses includes: a shaft body, an elastic body layer formed on an outer circumferential surface of the shaft body, and a surface layer formed on an outer circumferential surface of the elastic body layer. The elastic body layer contains a non-polar rubber, a polar rubber, and a carbon black, and has a relative permittivity of 7 or more and 29 or less and a resistance value of 6.0×104Ω or more and 5.0×106Ω or less. The surface layer contains a fluororesin and a (meth)acrylic resin, and has a relative permittivity of 10 or more and 22 or less and a resistance value of 1.2×104Ω or more and 8.8×105Ω or less.