Toner Detection Capacitance Calibration for Foreign Object Interference
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Solution Overview
Problem
Existing toner detection systems face inaccuracies due to foreign objects interposed between electrodes, causing capacitance variations and affecting the accurate determination of remaining toner amounts in toner containers.
Innovation Solution
A remaining toner amount detecting apparatus with two electrodes, a storage for preliminary capacitance values, and an abnormality detector to identify and correct for capacitance variations caused by foreign objects by using a calibration curve and threshold comparisons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If capacitance detection is used to measure remaining toner amount, then measurement capability is provided, but measurement precision deteriorates when foreign objects are present between electrodes
Solution Approach 1:
The patent performs preliminary detection of capacitance values in a non-disposed state (when toner container is removed) to establish baseline reference values. These preliminary measurements are stored and used later to detect abnormalities when toner container is disposed, allowing the system to identify foreign object interference before it affects accurate toner measurement.
Solution Approach 2:
The patent implements feedback by comparing current capacitance measurements with stored baseline values from the non-disposed state. When the capacitance value deviates from the expected range based on the baseline, the system identifies this as an abnormality indicating foreign object presence, enabling corrective action to maintain measurement precision.
2Difficulty of detecting and measuring
If capacitance value is used for toner amount detection, then detection function is achieved, but reliability deteriorates due to foreign objects affecting capacitance
Solution Approach 1:
The system performs preliminary capacitance detection in the non-disposed state to establish reference baseline values before actual toner measurement. This preliminary action creates a baseline against which subsequent measurements can be compared to identify foreign object interference that would compromise reliability.
Solution Approach 2:
The patent introduces an intermediary comparison mechanism using stored baseline capacitance values as a reference mediator. By comparing current measurements against this intermediary baseline, the system can filter out false readings caused by foreign objects and maintain reliable detection results.
3Device complexity
If no abnormality detection is implemented, then device complexity is low, but measurement precision deteriorates when foreign objects are present
Solution Approach 1:
The patent stores preliminary capacitance values detected in the non-disposed state as reference data. This preliminary action enables subsequent abnormality detection without requiring complex additional hardware, as the system uses stored baseline values to identify foreign object interference through comparison logic.
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
Enables accurate detection of remaining toner amounts by identifying and correcting for foreign object-induced capacitance variations, ensuring precise toner level reporting and reducing user effort in calibration adjustments.
Implementation Method 1
detects the remaining amount of toner in a toner container based on the capacitance between the two electrodes
Data Source
AI summary
A remaining toner amount detecting apparatus includes two electrodes; a remaining toner amount detector configured to detect a remaining toner amount in a toner container based on a capacitance between the two electrodes; a storage configured to store a first capacitance value between the two electrodes preliminarily detected in a non-disposed state in which the toner container is not disposed between the two electrodes; and an abnormality detector configured to detect an abnormality of the remaining toner amount detecting apparatus based on the first capacitance value stored in the storage and a second capacitance value between the two electrodes that is detected in the non-disposed state.