Developing Roller Silicon Oxide Film Surface Layer
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Solution Overview
Problem
Existing developing rollers for electrophotographic image forming apparatuses face issues with toner filming, low molecular weight substance exudation, and image quality due to inadequate surface layer properties, leading to reduced durability and image stability.
Innovation Solution
A developing roller with a silicon oxide film surface layer containing carbon atoms, chemically bonded to silicon, is used, which has a specific abundance ratio of oxygen to silicon (O/Si) and carbon to silicon (C/Si) to inhibit low molecular weight substance exudation, enhance toner release properties, and maintain flexibility, thereby preventing filming and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic particles are sprinkled onto the surface of the elastic layer to suppress filming, then toner release properties are improved, but the particles are easily detached during use and the effect cannot be sustained for a long period
Solution Approach 1:
The invention uses a composite surface layer comprising both inorganic particles (such as silica, alumina, or titania) and a binder resin. This composite structure allows the inorganic particles to provide toner release properties while the binder resin holds them firmly on the elastic layer surface, preventing detachment during use and sustaining the filming suppression effect over extended periods.
Solution Approach 2:
The invention optimizes parameters including the particle size distribution (combining fine particles of 0.1-10 μm for toner release with coarser particles for structural stability), the binder resin content (5-50 mass% of total surface layer), and the crosslinking degree of the elastic layer. These parameter adjustments ensure that inorganic particles remain firmly attached while maintaining effective toner release properties.
2Quantity of substance
If the elastic layer has strong tackiness to convey toner, then toner carrying capability is improved, but the toner remains attached on the developing roller and causes filming
Solution Approach 1:
The invention creates different surface properties at different locations or depths: the bulk elastic layer maintains strong tackiness for effective toner carrying, while the surface layer (with inorganic particles and binder resin) provides low tackiness for easy toner release. This local differentiation allows the developing roller to both convey and release toner effectively, preventing filming.
Solution Approach 2:
The surface layer acts as an intermediary between the elastic layer and the toner. It mediates the interaction by providing a interface that facilitates toner release while the underlying elastic layer maintains its toner carrying capability. The binder resin and inorganic particles together form this intermediary layer that resolves the conflict between toner attachment and release.
3Object-generated harmful factors
If a coating layer is applied to suppress filming, then filming is reduced, but the coating layer is insufficient in flexibility and adhesiveness to the elastic body, reducing reliability
Solution Approach 1:
The invention uses a thin film surface layer (1-10 μm thick) composed of binder resin and inorganic particles that maintains flexibility by being thin and elastomeric. This flexible thin film conforms to the elastic layer's deformation during operation, preventing cracking and delamination while providing effective filming suppression through its inorganic particle content.
Solution Approach 2:
The invention replaces mechanical adhesion (relying solely on physical bonding of coating to elastic layer) with chemical adhesion through crosslinking. The elastic layer is crosslinked to form a network structure that provides strong chemical bonds to the surface layer, significantly improving adhesiveness and reliability while maintaining flexibility.
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 solution effectively suppresses low molecular weight substance exudation, prevents toner filming, and enhances image quality and durability by maintaining the flexibility of the developing roller, ensuring stable high-quality electrophotographic images.
Implementation Method 1
a silicon oxide film containing a carbon atom chemically bonded to a silicon atom
Implementation Method 2
the silicon oxide film having an abundance ratio of an oxygen atom forming a chemical bond with a silicon atom to a silicon atom (O/Si) of 0.65 or more and 1.95 or less
Implementation Method 3
has a surface excellent in toner release properties
Data Source
AI summary
A developing roller is provided having a surface that has excellent effect of suppressing exudation of low molecular weight substances from an elastic body, excellent toner release properties, and sufficient flexibility in which cracks do not easily occur even by repeated image formation. The developing roller carries and conveys toner to develop electrostatic latent images on a photosensitive drum with the toner and includes in this order a mandrel, an elastic layer, and a surface layer. The surface layer includes a silicon oxide film containing carbon atoms chemically bonded to silicon atoms. The silicon oxide film has an abundance ratio of oxygen atoms forming chemical bonds with silicon atoms to silicon atoms (O/Si) of 0.65 or more and 1.95 or less, and an abundance ratio of carbon atoms forming chemical bonds with silicon atoms to silicon atoms (C/Si) of 0.05 or more and 1.65 or less.