Image Forming Apparatus With Dual AC Frequencies for Moire Control
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Solution Overview
Problem
Existing image forming apparatuses face challenges in maintaining image quality and preventing wear of image holding bodies when using different toners with the same AC frequency for charging and developing, leading to issues like moire and increased wear.
Innovation Solution
The apparatus employs separate charging and developing units with distinct AC frequencies for reference-color and special-color toners, along with a separation structure for wiring lines to prevent interference, thereby improving image quality and reducing wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same AC frequency is used for charging and developing units, then the device complexity is reduced, but image quality deteriorates due to moire patterns
Solution Approach 1:
The patent divides the AC frequency parameter into different segments for different functional units. Specifically, the charging unit and developing unit operate with different AC frequencies (first AC frequency for charging, second AC frequency for developing), which segments the frequency domain to prevent interference patterns and moire effects, thereby improving image quality while maintaining manageable device complexity through systematic frequency assignment.
Solution Approach 2:
The patent applies different AC frequencies locally to different functional units based on their specific requirements. The charging unit uses a first AC frequency optimized for charge uniformity, while the developing unit uses a second AC frequency optimized for toner development, allowing each local component to operate at its optimal frequency without compromising overall system complexity.
2Ease of operation
If the same AC frequency is used for charging and developing units, then the control system is simplified, but wear of image holding bodies increases
Solution Approach 1:
The patent segments the frequency control for different units to optimize their respective operations. By assigning a first AC frequency to the charging unit and a second AC frequency to the developing unit, each unit operates under optimized frequency conditions that reduce mechanical stress and wear on image holding bodies, thereby extending their service life while maintaining relatively simple control through independent frequency sources.
3Manufacturing precision
If different AC frequencies are used for charging and developing units, then image quality improves by preventing moire, but device complexity increases
Solution Approach 1:
The patent changes the frequency parameter from a single unified value to multiple distinct values for different functional units. By setting the charging unit to operate at a first AC frequency and the developing unit at a second AC frequency, the system achieves better image quality through parameter differentiation while managing complexity through systematic parameter assignment rather than complex structural modifications.
4Duration of action of stationary object
If different AC frequencies are used for charging and developing units, then wear of image holding bodies is reduced, but power supply system complexity increases
Solution Approach 1:
The patent segments the power supply frequency output to match the specific needs of different functional units. The power supply system provides a first AC frequency to the charging unit and a second AC frequency to the developing unit, segmenting the electrical input to optimize performance and reduce wear on image holding bodies while keeping the power supply architecture relatively simple through direct frequency assignment.
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 configuration enhances image quality by preventing moire and reducing wear of image holding bodies, while increasing freedom in power supply selection for developing units.
Implementation Method 1
a first charging unit that charges a first image holding body by applying a voltage in which an AC component has a first frequency to the first image holding body
Data Source
AI summary
An image forming apparatus includes: a first charging unit that charges a first image holding body by applying a voltage in which an AC component has a first frequency to the first image holding body; a first developing unit that develops a latent image formed on the first image holding body by using a reference-color toner; a second charging unit that charges a second image holding body by applying a voltage in which an AC component has a second frequency different from the first frequency to the second image holding body; and a second developing unit that develops a latent image formed on the second image holding body by using a special-color toner.