Developer Storage Segmentation for Compact Image Forming
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Solution Overview
Problem
In electrophotographic image forming processes, there is a challenge in maintaining stable image quality and long cartridge life while reducing the size of the developer storage space in image forming apparatuses, as existing one-component developing methods often result in reduced toner capacity and uneven color concentration due to the adhesion of toner on the carrier and the need for precise mixing ratios.
Innovation Solution
A developer with an aeration ratio (AR) of 5.0 to 10.0, measured by a powder rheometer, is used in a process cartridge with multiple developer storage portions, allowing for efficient toner distribution and maintaining image quality by preventing non-uniformity in color concentration until the toner is depleted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the process cartridge is made small to reduce apparatus size, then the apparatus becomes more compact, but the developer storage capacity is reduced and cartridge life is shortened
Solution Approach 1:
The developer storage space is divided into multiple separate storage portions (first developer storage portion and second developer storage portion) instead of using a single large container. This segmentation allows the total storage capacity to be maintained while each individual portion remains compact, solving the contradiction between small apparatus size and sufficient developer storage capacity.
2Volume of moving object
If the developer storage space is reduced to make the apparatus compact, then the apparatus size decreases, but non-uniformity in color concentration occurs and image quality deteriorates
Solution Approach 1:
By dividing the developer storage into multiple separate portions, each portion can be independently managed and supplied to the development area. This ensures uniform toner distribution and prevents color concentration non-uniformity even when the total storage space is reduced for compact apparatus design.
Solution Approach 2:
Each developer storage portion is optimized for its specific function and position, allowing local optimization of toner properties and supply mechanisms. This ensures that each region contributes to uniform color concentration while maintaining overall compactness.
3Volume of moving object
If the process cartridge is miniaturized to increase compactness, then the apparatus becomes smaller, but the number of printing sheets per cartridge is reduced
Solution Approach 1:
The developer storage is segmented into multiple portions that can be sequentially or simultaneously utilized. This segmentation allows the compact cartridge to maintain sufficient total developer capacity, ensuring long cartridge life (high number of printing sheets) despite the reduced overall size.
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 ensures stable image quality and extended cartridge life by optimizing toner distribution and storage capacity without increasing the apparatus size, ensuring consistent output throughout the toner's life.
Implementation Method 1
an aeration ratio (AR) of the developer measured by a powder rheometer being in a range of about 5.0 to about 10.0
Data Source
AI summary
The invention provides a developer having at least a toner, an aeration ratio (AR) of the developer measured by a powder rheometer being in a range of about 5.0 to about 10.0. It is preferable that the developer further contains an external additive of silica particles having a small diameter. The invention further provides a process cartridge having at least: a photoreceptor; and a developing device that comprises plura developer storage portions and that makes visible a latent image formed on the photoreceptor by using the developer. The invention further provides an image forming apparatus having at least the process cartridge.