Image Forming Apparatus Fault Detection via Controlled Potential Streaks
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Solution Overview
Problem
Current image forming apparatuses face challenges in accurately identifying faulty components due to the difficulty in detecting and describing 'defective images' caused by degradation, leading to increased costs and productivity losses as service personnel need to physically inspect and replace parts, often resulting in unnecessary unit replacements.
Innovation Solution
The image forming apparatus incorporates a controller that forms test images with controlled potentials to identify faulty components by analyzing streaks in the images, using camouflage patterns to obscure defects and determine the causal part through read data analysis, thereby reducing unnecessary replacements and improving diagnostic efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pattern image with predetermined density is formed to detect faults, then fault detection capability is improved, but false detection occurs due to normal density unevenness in the output image
Solution Approach 1:
The patent applies local quality by creating different potential conditions in different regions of the photosensitive member. Specifically, it forms a first potential in a first region and a second potential in a second region, where the potential difference is designed to be within a predetermined range. This localized potential variation causes streaks to appear only in specific regions where faults exist, while normal density unevenness does not produce false streaks, thereby improving both detection capability and reliability.
Solution Approach 2:
The patent changes the electrical potential parameter of the photosensitive member to create diagnostic streaks. By controlling the surface potential to be a first potential in a first region and a second potential in a second region with a specific potential difference, the system generates visible streaks that correspond to actual faults. This parameter change enables reliable fault detection without false positives from normal density variations.
2Measurement precision
If service personnel physically inspect and replace parts to identify faulty components, then diagnostic accuracy is improved, but maintenance cost and downtime increase
Solution Approach 1:
The patent implements self-service by enabling the image forming apparatus to automatically diagnose its own faults. The controller forms pattern images with specific potential distributions, detects streaks using the reader device, and identifies faulty components without requiring service personnel presence. This automated self-diagnosis maintains high diagnostic accuracy while significantly reducing maintenance downtime and costs.
Solution Approach 2:
The patent creates a diagnostic copy system where the controller generates test pattern images that replicate the conditions for fault detection. By forming images with controlled potential differences and analyzing the resulting streak patterns, the system creates diagnostic information copies that accurately identify faults without requiring physical inspection or part replacement.
Data Source
AI summary
A controller controls a charging unit to charge a photosensitive member so that a surface potential of the photosensitive member is controlled to a first potential, controls an exposure unit to expose the photosensitive member so that a potential of an exposure region on the photosensitive member is controlled to a second potential, controls a surface potential of a developing sleeve of a developing unit to a third potential, and forms a test image on a sheet by controlling the photosensitive member, the charging unit, the exposure unit, and the developing unit. An absolute value of the first potential is higher than an absolute value of the second potential. An absolute value of the third potential is higher than the absolute value of the first potential.