Polygon Mirror Remaining Life Prediction via Sensor Feedback
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Solution Overview
Problem
Existing image forming apparatuses cannot accurately predict when a polygon mirror becomes out of use due to dirt, leading to premature or delayed replacement, as they only notify users of the mirror's deteriorated state without providing a clear estimate of remaining usage time.
Innovation Solution
An image forming apparatus that includes an optical sensor and a hardware processor to measure the output level of the optical sensor, calculating the remaining life of the polygon mirror by assuming a rate of change in the output level over time, allowing for a prediction of when the mirror will reach a threshold value, thereby guiding users on timely replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional dirt detection methods are used to monitor polygon mirror condition, then the mirror can be detected as close to out of use, but the remaining usage time cannot be predicted accurately
Solution Approach 1:
The system performs preliminary action by measuring the light amount at multiple time points before the polygon mirror reaches its end of life, and stores these measurement results. This allows the system to predict remaining usage time in advance by analyzing the rate of change of light amount over time, rather than only detecting when the mirror is close to failure.
Solution Approach 2:
The system implements feedback by continuously monitoring the light amount reflected from the polygon mirror, comparing it with previously stored measurement results, and using this feedback to calculate the rate of change. This feedback mechanism enables accurate prediction of remaining usage time by tracking the deterioration trend of the mirror surface.
2Reliability
If the polygon mirror is replaced early based on conventional notification, then reliability is maintained, but unnecessary replacements occur increasing loss of time and resources
Solution Approach 1:
The system performs preliminary prediction of remaining usage time by analyzing light amount measurements taken at multiple time points. This allows users to plan mirror replacement in advance based on accurate predictions, avoiding both premature replacement and unexpected failures, thereby optimizing the replacement timing.
3Productivity
If the polygon mirror is used longer without replacement, then productivity is improved, but the risk of sudden failure increases
Solution Approach 1:
The system continuously monitors the light amount reflected from the polygon mirror and provides feedback on the rate of change. This allows users to extend the usage period of the mirror with confidence, as the system can predict remaining life and alert users before sudden failure occurs, thereby maximizing productivity while maintaining reliability.
4Measurement precision
If light amount measurement is performed continuously to predict remaining life, then prediction accuracy is improved, but device complexity increases
Solution Approach 1:
The system uses a light amount sensor that serves multiple functions: it detects the start of scan signal, monitors the light amount for dirt detection, and provides data for remaining life prediction. By making the sensor multi-functional, the system achieves accurate prediction without adding dedicated measurement devices, thereby avoiding increased device complexity.
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 solution enables users to predict the remaining operational time of the polygon mirror, reducing unnecessary replacements and ensuring timely maintenance, thus optimizing the usage and lifespan of the mirror.
Implementation Method 1
an optical sensor arranged such that the light beam deflected by the polygon mirror enters the optical sensor
Data Source
AI summary
An image forming apparatus including a polygon mirror that deflects a light beam, the image forming apparatus includes: an optical sensor arranged such that the light beam deflected by the polygon mirror enters the optical sensor; and a hardware processor that measures an output level of the optical sensor and calculates, as a remaining life of the polygon mirror, an operation time of the polygon mirror to when the output level becomes a threshold value in a case of assuming that the output level ongoingly changes at a rate of change over time that is a change amount of the output level per unit operation time of the polygon mirror, using the measured output level.