Dynamic Patch Pattern Control for Image Density in Process Cartridges
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Solution Overview
Problem
Existing image forming apparatuses fail to accurately adjust image density control when using process cartridges with different service lives, as they do not account for variations in functional components and toner amounts, leading to inconsistent image quality.
Innovation Solution
The apparatus includes a detecting unit to measure reflected light from developer images, a control unit to adjust image density based on image data and reflected light information, and a memory to store developer amounts, allowing for customized patch patterns for each process cartridge type based on its service life or toner filling amount.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single fixed patch pattern is used for image density control across all process cartridges, then the control method is simple, but the image density control accuracy deteriorates when using process cartridges with different service lives
Solution Approach 1:
The patch pattern is made dynamic by selecting different patterns based on the process cartridge type detected through memory information. The control unit dynamically switches between first patch patterns (for small-capacity cartridges) and second patch patterns (for large-capacity cartridges) to optimize image density control accuracy for each cartridge type.
Solution Approach 2:
Different patch patterns are applied to different process cartridge types based on their specific characteristics. The first patch pattern is used locally for small-capacity cartridges while the second patch pattern is used locally for large-capacity cartridges, ensuring each cartridge type receives the optimal control pattern for its capacity.
2Adaptability or versatility
If process cartridges with different service lives are used, then user choice and cost flexibility are improved, but image density control consistency deteriorates due to different functional components and toner amounts
Solution Approach 1:
The system changes the parameter of patch pattern selection based on the process cartridge type. By detecting the cartridge type through memory information and selecting appropriate patch patterns, the system maintains consistent image density control across different cartridge types with varying service lives and toner amounts.
Solution Approach 2:
The control unit uses feedback from the memory information of the process cartridge to determine the appropriate patch pattern. This feedback mechanism ensures that the image density control adapts to the specific cartridge type, maintaining consistency despite differences in service life and toner capacity.
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 approach improves the accuracy of image density control, optimizing toner usage and maintaining consistent image quality across process cartridges with varying service lives, thereby extending the number of printable sheets and providing a lighter, easier-to-handle cartridge.
Implementation Method 1
a detecting unit configured to emit light to a patch of the developer image, detect reflected light
Data Source
AI summary
Provided is an image forming apparatus having a process cartridge which includes: an image bearing member; a developer bearing member which develops an electrostatic latent image with developer; a accommodating chamber which contains the developer; and a memory. The image forming apparatus includes: a detector for emitting light to a patch of a developer image, detecting reflected light; and a controller for performing image density control when controlling image density to form the developer image, based on a value of an image data and information on the reflected light. The memory stores information corresponding to a developer amount in the accommodating chamber, and the controller changes the patch pattern between a case where the information in the memory is information relating to a first amount and a second amount.