Toner Bottle Capacitance Detection Using Segmented Electrodes
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Solution Overview
Problem
Existing toner detection systems in image forming apparatuses face decreased detection accuracy when the amount of remaining toner is low, due to a large air layer capacitance ratio between electrodes facing the entire toner bottle.
Innovation Solution
The system employs a pair of first and second electrodes positioned closer to the cap of a cylindrical toner bottle, with the second pair closer to the cap than the first, to detect toner levels based on capacitance values, improving detection accuracy by reducing the air layer effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a pair of electrodes face the entire region of the toner bottle in the axial direction, then the detection coverage is comprehensive, but the detection accuracy decreases when the toner nearly ends due to large air layer capacitance ratio
Solution Approach 1:
The single electrode pair facing the entire toner bottle is segmented into multiple electrode pairs positioned at different axial locations. Each electrode pair measures a specific segment of the bottle, allowing the system to identify and exclude measurements dominated by air layer capacitance while maintaining comprehensive monitoring coverage through the combined data from all segments.
Solution Approach 2:
Different regions of the toner bottle are measured with different electrode pairs positioned to optimize local measurement quality. The electrode pairs are strategically positioned to measure regions where toner is most likely to remain, giving those regions higher measurement weight while reducing the influence of regions prone to air layer interference.
2Measurement precision
If electrodes are positioned closer to the cap, then the air layer effect is reduced improving detection accuracy, but the measurement coverage of the bottle body is limited
Solution Approach 1:
The measurement task is segmented across multiple electrode pairs positioned at different axial locations along the bottle. This segmentation allows each electrode pair to focus on a specific region with optimized positioning for that region, collectively achieving both high local precision and comprehensive overall coverage.
Solution Approach 2:
The measurement approach transitions from a single axial measurement to multi-dimensional measurement by distributing electrode pairs along the axial dimension. This dimensional expansion allows the system to capture toner distribution information at multiple heights, achieving comprehensive coverage while maintaining high accuracy at each measurement point.
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 configuration enhances the signal-to-noise ratio and prevents a decrease in detection accuracy when toner levels are low, effectively improving the reliability of toner level detection.
Implementation Method 1
The amount of remaining toner in the toner bottle is detected as a change in capacitance value between the electrodes
Data Source
AI summary
An amount-of-remaining-toner detecting device includes: a toner housing portion in which a toner bottle is housed, the toner bottle having a bottle body that is cylindrical and in which toner is housed, and a cap that is attached to one end of the bottle body in an axial direction of the bottle body and from which the toner housed in the bottle body is discharged; and circuitry configured to detect an amount of remaining toner in the toner bottle housed in the toner housing portion. The toner housing portion includes a first pair of electrodes facing each other with the bottle body interposed between the first pair of electrodes, and a second pair of electrodes facing each other with the bottle body interposed between the second pair of electrodes, at respective positions closer to the cap than the first pair of electrodes are. The circuitry detects the amount of remaining toner in the bottle body, based on at least one of a capacitance value between the first pair of electrodes or a capacitance value between the second pair of electrodes.