Printing Density Control via Developing Roller Bias Voltage
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Solution Overview
Problem
Image forming devices perceive a decrease in printing density when the amount of pages per paper or print rate is reduced, leading to degraded readability and clarity due to the reduced size of printed matter, despite maintaining the same actual printing density.
Innovation Solution
An apparatus and method to control printing density in image forming devices, allowing users to manually or automatically set printing density based on the amount of pages per paper and print rate, using a user interface connected to a host computer, which adjusts the bias voltage applied to the developing roller to maintain or increase printing density, thereby enhancing readability and clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the amount of pages for a single paper is increased or the print rate is reduced, then the productivity is improved, but the perceived printing density is degraded
Solution Approach 1:
The patent changes the printing density parameter dynamically based on the print job configuration. When the amount of pages for a single paper is increased or print rate is reduced, the system automatically increases the printing density parameter to compensate for the reduced size, thereby maintaining perceived readability and clarity.
2Productivity
If the amount of pages for a single paper is increased or the print rate is reduced, then the productivity is improved, but the readability and clarity are degraded
Solution Approach 1:
The system dynamically adjusts the printing density parameter based on productivity settings. When users increase the amount of pages for a single paper or reduce print rate, the system automatically increases printing density to maintain information quality, preventing loss of readability and clarity.
3Manufacturing precision
If the printing density is increased to maintain readability, then the perceived printing density is improved, but the device complexity increases
Solution Approach 1:
The control system automatically adjusts printing density based on print job parameters without requiring manual user intervention. The system monitors the amount of pages for a single paper and print rate settings, then self-adjusts the printing density parameter accordingly, reducing operational complexity while maintaining precision.
Solution Approach 2:
The system implements a feedback mechanism where the control unit continuously monitors print job parameters (amount of pages, print rate) and adjusts printing density in response. This closed-loop control automates the adjustment process, managing device complexity through systematic parameter interdependence rather than manual intervention.
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
Prevents the perceived degradation of printing density in reduced print jobs by adjusting the bias voltage to maintain or increase the actual printing density, improving readability and clarity of printed matter.
Implementation Method 1
a developing device to develop an image by adjusting an amount of toner according to the printing density control signal of the print engine section
Data Source
AI summary
An apparatus to control a printing density in an image forming device and a method thereof, capable of controlling the printing density of a printed matter according to an amount of pages for a single page and a print rate. The apparatus and method solve a problem wherein the printing density is recognized as being degraded due to an increase of pages for a single paper or a reduced print rate. The printing density is set automatically or manually, and a bias voltage applied to a developing roller is controlled according to set-up information so that the printing density is controlled.