Image Forming Apparatus Exposure Control
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in maintaining optimal image formation due to changes in environment and time, as the relation between exposure amount and exposed-area potential changes significantly, leading to increased data requirements and inefficiencies in adjustment systems.
Innovation Solution
An image forming apparatus that includes a photosensitive element with a specific property where the ratio of exposed-area potential decrease to exposure amount increase is managed, using a charging unit, exposure unit, developing unit, transferring unit, control unit, and potential detecting unit to determine a reference exposure amount based on detected potentials, allowing for efficient adjustment without extensive data tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If a longer-lasting photosensitive element with filler is used, then wear resistance and operating life are improved, but the relation between exposure amount and exposed-area potential changes significantly with time and environment
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the reference exposure amount based on detected potential values. Instead of relying on fixed data tables that become invalid over time, the system continuously adapts the exposure parameters to compensate for changes in the photosensitive element's characteristics, thereby maintaining stable image formation despite the element's aging
Solution Approach 2:
The system implements self-service through automatic process control where the image forming apparatus monitors its own performance by detecting potential values and autonomously adjusts the reference exposure amount. This eliminates the need for manual recalibration and enables the system to self-correct for changes in the photosensitive element's properties over time
2Ease of operation
If data tables with development potential and corresponding parameters are used, then adjustment simplicity is improved, but data storage requirements increase significantly when accounting for environmental changes
Solution Approach 1:
The patent extracts the essential adjustment parameter (reference exposure amount) from complex multi-dimensional data tables that would require storage for various environmental conditions. By using a detection-based approach, the system determines adjustments based on actual measured potential values rather than pre-stored data for every possible condition, significantly reducing data storage requirements while maintaining adjustment simplicity
Solution Approach 2:
The system transitions from static data tables to dynamic parameter adjustment based on real-time detection. The reference exposure amount is continuously adapted according to detected potential values, allowing the system to respond to environmental changes without requiring pre-stored data for each scenario, thus reducing data storage needs while maintaining operational simplicity
3Stability of the object's composition
If reference exposure amount is adjusted based on detected potential values, then image formation consistency is improved, but control system complexity increases
Solution Approach 1:
The patent implements feedback control by detecting the potential values on the photosensitive element and using this information to adjust the reference exposure amount. This closed-loop system continuously monitors the actual state and makes corrections to maintain consistent image formation, achieving stability through automated feedback rather than complex manual control mechanisms
Solution Approach 2:
The system replaces complex mechanical adjustment mechanisms with electronic detection and control. Instead of physical recalibration of exposure parameters, the system uses electrical potential detection and electronic adjustment of exposure settings, simplifying the control system while improving consistency
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 enables effective adjustment of exposure amounts to maintain suitable image formation across varying conditions without the need for extensive data tables, reducing data requirements and ensuring consistent image quality.
Implementation Method 1
a charging unit that charges the surface of the photosensitive element to a target potential
Implementation Method 2
an exposure unit that exposes an exposure target area on the charged surface of the photosensitive element to light of an exposure amount thereby forming an electrostatic latent image in the exposure target area by lowering a potential of the exposure target area
Implementation Method 3
a potential detecting unit that detects a potential of the surface of the photosensitive element
Data Source
AI summary
A printer determines, in a process control, a reference exposure amount. A charging unit charges a surface of a photosensitive element to a target potential. After an exposure target area on the charged surface of the photosensitive element is exposed to a high adjustment exposure that corresponds to a high-exposure amount area, a control unit determines the reference exposure amount based on the target potential and a detected residual potential that is a result detected by a potential detecting unit as a potential of the target exposure area on the photosensitive element after being exposed to the high adjustment exposure.