Image Forming Apparatus Calibration via Single Test Image
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Solution Overview
Problem
Existing image forming apparatuses require multiple calibration processes to achieve different target maximum densities, leading to inefficiencies and increased time, as they adjust image forming conditions for each target density individually without a method to efficiently switch between them.
Innovation Solution
An image forming apparatus that includes an image forming unit, a reading unit, and a controller to generate image forming conditions for multiple target maximum densities based on a single test image, using a density sensor to detect toner patterns and adjust exposure and bias voltages to achieve desired densities, allowing for simultaneous determination of conditions for multiple target densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed for each target maximum density individually, then image forming conditions can be accurately adjusted for each density level, but the total calibration time increases significantly
Solution Approach 1:
The patent combines multiple calibration processes for different target maximum densities into a single integrated calibration operation. By forming one test image that contains multiple toner patterns with different image formation conditions (exposure amounts, charging bias voltages, developing bias voltages), the system can simultaneously determine optimal image forming conditions for multiple target densities, reducing calibration time while maintaining accuracy
Solution Approach 2:
The patent performs preliminary formation of a comprehensive test image containing all necessary toner patterns before actual calibration measurements. This test image is formed in advance with various image formation conditions, allowing the system to pre-calculate optimal parameters for multiple target maximum densities simultaneously, rather than sequentially adjusting conditions for each density level
2Adaptability or versatility
If image forming conditions are switched based on target density, then different applications can be supported, but the system complexity increases
Solution Approach 1:
The patent achieves application flexibility by dynamically changing image forming parameters (exposure amount, charging bias voltage, developing bias voltage) based on the target maximum density. The system stores multiple sets of image forming conditions corresponding to different target densities and selects appropriate parameters automatically, supporting various applications from general office printing to high-quality catalog printing without increasing physical system complexity
Solution Approach 2:
The patent creates a universal calibration system that can handle multiple target maximum densities and different applications through a single integrated approach. The test image formation process and condition determination method are designed to be universally applicable across different density requirements, allowing one system to serve multiple functions without requiring separate calibration procedures for each application
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 enables the determination of image forming conditions for multiple target maximum densities in a single calibration process, reducing the time required and improving accuracy by using a single test image to set optimal conditions for various density levels.
Implementation Method 1
a reading unit configured to read a test image formed on the sheet by the image forming unit
Data Source
AI summary
An image forming apparatus forms an image on a sheet based on an image forming condition, reads a test image formed on the sheet. The test image includes a plurality of images formed based on mutually different image forming conditions. The image forming apparatus generates, based on a reading result regarding the test image, both a first image forming condition for a first target maximum density and a second image forming condition for a second target maximum density higher than the first target maximum density.