Contone Test Pattern Diagnosis for Image Forming Apparatus
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for diagnosing print quality in image forming apparatuses, such as printers, are inadequate as they rely on halftoning, which makes it difficult to detect quality defects, hindering effective condition monitoring and predictive maintenance.
Innovation Solution
The implementation of a contone test pattern that is transferred onto an intermediate transfer body and sensed by a photo-sensor, allowing for easier detection of quality defects and enabling the diagnosis of image forming apparatus conditions, including predicting component life expectancy and abnormal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If halftoning technology is used to output test patterns, then the image forming apparatus can display test patterns on printing paper, but it becomes difficult to detect quality defects accurately
Solution Approach 1:
The patent changes the fundamental parameter of the test pattern from halftoned (dotted) representation to contone (continuous tone) representation. This parameter change transforms the test pattern into a form that clearly reveals quality defects such as density variations, scratches, and foreign objects on the intermediate transfer body, thereby resolving the contradiction between being able to output test patterns and accurately detecting quality defects
Solution Approach 2:
The patent uses the photo-sensor to create an electrical signal copy of the test pattern image formed on the intermediate transfer body. This copying process allows the diagnosis unit to analyze the test pattern without physical contact, enabling accurate detection of quality defects while maintaining the ease of test pattern output
2Productivity
If halftoning is used for test pattern output, then the apparatus can perform basic printing tests, but effective condition monitoring and predictive maintenance are hindered
Solution Approach 1:
The patent implements a feedback mechanism where the photo-sensor continuously monitors the test pattern formed on the intermediate transfer body, and the diagnosis unit analyzes the returned signals to determine apparatus condition. This closed-loop feedback system enables effective condition monitoring and predictive maintenance by providing real-time information about apparatus health, resolving the contradiction between basic test capability and monitoring effectiveness
Solution Approach 2:
The patent performs preliminary diagnosis actions by analyzing the test pattern before actual printing operations are affected. The diagnosis unit evaluates apparatus condition based on the contone test pattern results, allowing predictive maintenance to be performed in advance, thus maintaining productivity while improving reliability
3Measurement precision
If a contone test pattern is used instead of halftoning, then quality defects can be clearly detected, but the system complexity increases due to additional sensing and diagnosis components
Solution Approach 1:
The patent makes the photo-sensor and diagnosis unit serve multiple functions: they not only detect quality defects in the test pattern but also monitor apparatus condition, predict maintenance needs, and provide feedback for process control. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in system complexity while maintaining high measurement precision
Solution Approach 2:
The diagnosis system is integrated into the image forming apparatus itself, allowing the apparatus to self-diagnose its condition using its own components (photo-sensor, controller, intermediate transfer body). This self-service capability eliminates the need for external complex diagnostic equipment, resolving the contradiction between detection accuracy and system complexity
4Measurement precision
If the test pattern is sensed by a photo-sensor on the intermediate transfer body, then accurate diagnosis is enabled, but the time required for testing and analysis increases
Solution Approach 1:
The patent enables continuous sensing of the test pattern as it passes through the intermediate transfer body. The photo-sensor continuously converts the optical information into electrical signals without interrupting the printing process, and the diagnosis unit continuously analyzes these signals. This continuous action allows accurate diagnosis to be performed without significant time loss, resolving the contradiction between diagnosis accuracy and testing time
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 allows for accurate diagnosis and predictive maintenance of image forming apparatuses, improving print quality monitoring and reducing downtime by clearly showcasing defects in the test pattern, facilitating corrective measures.
Implementation Method 1
a photo-sensor, allowing for easier detection of quality defects
Data Source
AI summary
An image forming apparatus includes an exposure device, a developing device, an intermediate transfer body, a sensor, and a controller. The exposure device may irradiate light corresponding to a test pattern onto a photoconductor, the developing device may supply a developing agent to the photoconductor to form, on the photoconductor, a toner image corresponding to the test pattern, the intermediate transfer body may receive the toner image corresponding to the test pattern formed on the photoconductor, and a sensor may sense the test pattern transferred onto the intermediate transfer body. The controller may control the exposure device to adjust the irradiated light so the test pattern becomes a contone pattern having a uniform tone, and may diagnose a condition of a component of the image forming apparatus based on the sensed test pattern.