Liquid Developer Concentration Adjustment via Viscosity Detection
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Solution Overview
Problem
Existing methods for adjusting the concentration of liquid developers in electrophotographic processes face challenges such as poor accuracy in measuring high concentrations, sensitivity to temperature changes, and the need for numerous correction tables, which complicates precise concentration adjustment and handling of lot-to-lot variations.
Innovation Solution
A system that includes a concentration adjusting container, a viscosity detector, a temperature detector, and a memory to store correction tables, allowing for real-time adjustment of the liquid developer concentration based on measured viscosity and temperature, using a stirring mechanism to detect motor current as a viscosity property value and correcting for temperature variations with a specific correction table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light transmittance detection is used to measure developer concentration, then measurement is simple, but accuracy deteriorates at high concentrations due to light saturation
Solution Approach 1:
The patent replaces optical detection (light transmittance) with mechanical detection (viscometer-based viscosity measurement). The viscometer measures the rotational resistance of the developer, which correlates to concentration without suffering from light saturation effects. This mechanical approach maintains measurement simplicity while achieving accurate concentration detection across the full range including high concentrations.
2Measurement precision
If viscosity measurement is used to measure developer concentration, then accuracy at high concentration is improved, but temperature sensitivity causes measurement errors
Solution Approach 1:
The patent incorporates a temperature sensor that continuously monitors developer temperature and feeds this information back to the control unit. The control unit uses the temperature data to select appropriate correction values from a correction table, compensating for temperature-induced viscosity changes. This feedback mechanism eliminates measurement errors caused by temperature variations while maintaining accurate concentration measurement.
3Object-affected harmful factors
If fixed correction maps are used for temperature compensation, then temperature characteristics are corrected, but lot-to-lot variations cause high-precision adjustment to fail
Solution Approach 1:
The patent transitions from static fixed correction maps to dynamic adaptive correction. The system measures the actual viscosity-temperature characteristics of the specific developer batch using the viscometer and temperature sensor, then generates customized correction data tailored to that batch's properties. This dynamic approach adapts to lot-to-lot variations in toner and carrier characteristics, maintaining high-precision concentration adjustment for each specific developer formulation.
4Object-affected harmful factors
If multiple correction tables are prepared for different developer types, then temperature characteristics are corrected, but device complexity increases
Solution Approach 1:
The patent enables the system to automatically characterize each developer batch and generate its own correction table without requiring pre-prepared tables for different developer types. The viscometer and temperature sensor work together to measure the actual viscosity-temperature relationship, and the control unit automatically creates the appropriate correction data. This self-service approach eliminates the need for complex correction table management while maintaining accurate temperature compensation.
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
Ensures high-precision concentration adjustment of liquid developers, simplifies the correction process, and reduces the need for multiple correction tables, effectively addressing the challenges of temperature sensitivity and lot-to-lot variations, while improving the accuracy and efficiency of concentration measurement.
Implementation Method 1
a viscosity detector for detecting a viscosity property value which depends on concentration of a liquid developer in the concentration adjusting container
Implementation Method 2
a temperature detector for detecting a temperature of a liquid developer in the concentration adjusting container
Implementation Method 3
using a stirring mechanism to detect motor current as a viscosity property value
Data Source
AI summary
In order to conform a specific correction table to the characteristics of a liquid developer to be used, the specific correction table is created by calibrating a standard correction table stored in advance by using a viscosity property value of a liquid developer for calibration at a current temperature. A concentration adjustment is performed by comparing a measured viscosity property value with a target viscosity property value which is temperature-corrected based on the specific correction table. Further, the viscosity property value of a liquid developer is detected by measuring the current of a motor for stirring the liquid developer, where a no-load stirring current value is measured in the absence of a liquid developer, and one or both of a measured current value and target current value is corrected based thereon.