Toner Image Density Control With Dynamic Bias Coefficients
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Solution Overview
Problem
Existing image forming apparatuses using electrophotography face challenges in accurately adjusting toner image forming conditions due to the complexity of relational expressions between developing bias voltage and toner concentration, leading to increased data retention requirements.
Innovation Solution
The apparatus incorporates a control system with first, second, and third acquisition processing portions to acquire toner concentration and image forming conditions, using specific expressions to calculate coefficients for improved toner image forming conditions, thereby enhancing adjustment accuracy without increasing data retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of relational expressions are retained for varying toner charge amounts, then adjustment accuracy of developing bias voltage may be improved, but data retention amount increases
Solution Approach 1:
The patent extracts only the essential parameters (toner charge amount and its derivative values) from the complex set of relational expressions. Instead of retaining multiple complete relational expressions for different toner charge amounts, the system extracts the core variation pattern and represents it through a single relational expression with dynamically calculated coefficients based on toner charge amount measurements.
Solution Approach 2:
The patent changes the parameters of the relational expression by dynamically adjusting its coefficients based on the measured toner charge amount. Rather than storing multiple fixed relational expressions, the system modifies the parameters (coefficients) of a single relational expression in real-time based on the current toner charge amount, achieving adaptability without increasing data storage.
2Manufacturing precision
If multiple relational expressions are stored for different toner charge amounts, then better image density adjustment is achieved, but device complexity increases
Solution Approach 1:
The patent creates a universal relational expression that can function for multiple toner charge amount conditions. A single relational expression structure serves multiple purposes by dynamically adjusting its coefficients based on the current toner charge amount, eliminating the need for separate relational expressions for each condition and simplifying data management.
Solution Approach 2:
The patent introduces dynamics into the relational expression by making its coefficients variable rather than fixed. The coefficients are dynamically calculated based on the measured toner charge amount, allowing the same relational expression structure to adapt to different operating conditions without requiring multiple static expressions to be stored and managed.
Data Source
AI summary
An image forming apparatus includes a second acquisition processing portion and a third acquisition processing portion. The second acquisition processing portion acquires a first toner image forming condition of a toner image forming portion. The third acquisition processing portion acquires, based on the first toner image forming condition acquired by the second acquisition processing portion, a relational expression that indicates a relationship between a second toner image forming condition of the toner image forming portion and a toner concentration of a specific toner image that is formed by the toner image forming portion. Further, the third acquisition processing portion uses specific expressions that respectively correspond to a plurality of coefficients included in the relational expression to calculate the plurality of coefficients corresponding to the first toner image forming condition acquired by the second acquisition processing portion.