Toner Charge Stabilization via Predictive Supply Control
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Solution Overview
Problem
Conventional image forming apparatuses face challenges in stabilizing toner particle charge amounts, leading to variations in image density and quality, particularly when using electrophotographic technology, which affects the transfer property and image formation, especially with secondary and tertiary colors.
Innovation Solution
An image forming apparatus comprising a photoreceptor, exposure unit, developing unit, detecting unit, and controller that estimates and controls the toner particle charge amount by adjusting the toner supply based on image data, rotation time, and detected toner density to maintain the charge amount within a predetermined range, using formulas to predict and adjust the toner particle charge amount for each time step.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If feedback control is used to stabilize output density by adjusting toner supply amount based on patch image measurement, then image density stability is improved, but control delay occurs because measurement and adjustment take time
Solution Approach 1:
The system performs feedforward control by predicting the toner particle charge amount before image formation based on image data, and adjusts the contrast potential in advance. This preliminary action prevents density deviation from occurring in the first place, eliminating the need for delayed feedback correction and achieving real-time density stability.
Solution Approach 2:
The system combines feedforward prediction with feedback mechanisms by using inductance sensors to measure toner density in the developer and adjusting toner supply amount accordingly. This hybrid approach maintains density stability while reducing the impact of control delays through continuous real-time monitoring and adjustment.
2Stability of the object's composition
If contrast potential is adjusted based on prediction of toner particle charge amount to stabilize image density, then density control is improved, but transfer property deteriorates because toner charge amount becomes insufficient or excessive
Solution Approach 1:
The system dynamically adjusts two key parameters: contrast potential and toner supply amount, based on real-time prediction of toner particle charge amount. By simultaneously optimizing both parameters, the system maintains proper toner charge for transfer while achieving stable image density, resolving the contradiction between density control and transfer property.
Solution Approach 2:
The system implements dynamic control by continuously monitoring image data, predicting toner charge amount changes, and adjusting contrast potential and toner supply in real-time. This dynamic adaptation ensures that both transfer property and image density remain optimal under varying operating conditions.
3Stability of the object's composition
If toner supply amount is increased to maintain constant toner developing amount, then image density is stabilized, but toner particle charge amount varies causing transfer property issues
Solution Approach 1:
The system uses inductance sensors to measure toner density in the developer as feedback, and adjusts toner supply amount in real-time to maintain consistent toner particle charge amount. This feedback control ensures that both image density and transfer property remain stable by preventing toner charge variation.
Solution Approach 2:
The system replaces mechanical toner supply adjustment with electromagnetic measurement and control. Inductance sensors detect toner density changes, and the controller adjusts toner supply based on electrical measurements rather than mechanical feedback, enabling more precise and rapid control of toner charge 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 effectively stabilizes the toner particle charge amount, ensuring consistent image density and quality, even with secondary and tertiary colors, by accurately predicting and adjusting the toner supply, thereby improving the transfer property and maintaining image formation stability.
Implementation Method 1
exposure unit configured to expose the photoreceptor based on image data to form an electrostatic latent image on the photoreceptor
Implementation Method 2
developing unit, having a rotating member configured to rotate to charge a developer including toner
Implementation Method 3
image forming apparatus which performs development by adhering a toner particle to a latent image
Data Source
AI summary
Image formation is properly performed by suppressing an influence on a transfer property in the image formation due to variation in a toner particle charge amount. An image forming apparatus comprises a developing device for performing development using developer including a charged toner particle, a toner supply container for supplying the toner particle to a development unit, and a CPU for controlling a toner particle amount supplied to the developing device. The CPU calculates a toner consumption amount consumed by the development. Then, from the result, the CPU calculates a toner supply amount which makes the toner charge amount in the developing device constant. Then, the CPU supplies the toner of the calculated amount to the developing device.