Wet-Type Developing Device Charge Neutralization and Ultrasonic Dispersion
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Solution Overview
Problem
In wet-type developing devices, toner particles accumulate on the removing unit due to insufficient cancellation of electrostatic binding forces, leading to inefficient reuse and maintenance issues, as well as image quality deterioration.
Innovation Solution
A wet-type developing device with a charge neutralizing unit that neutralizes the charge of toner particles, a dispersing unit that uses an AC bias and ultrasonic vibration to disperse toner particles in the carrier liquid, and a removing unit that effectively recovers the toner particles, preventing accumulation on the removing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If only charge neutralization is performed without dispersion, then the electrostatic binding force is reduced, but toner particles still accumulate on the removing unit due to insufficient separation
Solution Approach 1:
The patent combines charge neutralization and dispersion functions into a single integrated unit. The charge neutralizing unit neutralizes electrostatic charges while the dispersing unit simultaneously separates toner particles using ultrasonic vibration, preventing accumulation on the removing unit through combined action rather than sequential processes
Solution Approach 2:
The dispersing unit employs ultrasonic vibration to mechanically separate toner particles in the wet-type developer. This mechanical vibration energy breaks up particle aggregates and maintains uniform distribution, effectively preventing toner accumulation on the removing unit during the cleaning process
2Productivity
If toner particles are not dispersed properly, then recovery efficiency decreases, but the device complexity increases with additional dispersion mechanisms
Solution Approach 1:
The charge neutralizing unit and dispersing unit are integrated into a single compact structure that performs both functions simultaneously. This merging approach improves toner recovery efficiency by ensuring proper dispersion before removal without requiring separate, complex dispersion systems throughout the device
Solution Approach 2:
The ultrasonic vibration mechanism in the dispersing unit automatically maintains toner particle separation through self-sustaining oscillation. The system uses its own operational energy to continuously disperse particles during the removal process, eliminating the need for additional complex external dispersion mechanisms
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
The solution ensures that toner particles are efficiently dispersed and recovered, reducing accumulation on the removing unit, enabling repeated use and improving maintainability while maintaining image quality.
Implementation Method 1
a charge neutralizing unit for neutralizing a charge of the toner particle contained in the wet-type developer remaining on the developer carrier
Implementation Method 2
a dispersing unit for dispersing the toner particle in the carrier liquid by acting on the toner particle contained in the wet-type developer neutralized in charge by the charge neutralizing unit
Implementation Method 3
a dispersing unit for dispersing the toner particle in the carrier liquid by acting on the toner particle contained in the wet-type developer neutralized in charge by the charge neutralizing unit
Data Source
AI summary
The present wet-type developing device includes: a developer carrier for carrying a wet-type developer, which contains a charged toner particle and carrier liquid, and supplying the wet-type developer to an image carrier on which an electrostatic latent image is formed; a charge neutralizing unit for neutralizing a charge of the toner particle contained in the wet-type developer remaining on the developer carrier after supplying the wet-type developer to the image carrier; a dispersing unit for dispersing the toner particle in the carrier liquid by acting on the toner particle contained in the wet-type developer neutralized in charge by the charge neutralizing unit; and a removing unit for removing, from the developer carrier, the wet-type developer containing the toner particle dispersed by the dispersing unit.