Multiple-Reflection Moisture Sensing for Sheet Detection Accuracy
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Solution Overview
Problem
Conventional moisture sensors struggle to accurately detect minute changes in moisture levels in sheets due to small changes in reflected light, leading to inaccuracies in moisture detection.
Innovation Solution
A moisture sensor design that utilizes multiple reflections of light between a reflecting member and the sheet surface, combined with a semiconductor light-emitting element and a photodiode, to enhance detection accuracy by increasing the change in received light amount in response to moisture variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional single-reflection light detection is used, then device structure is simple, but measurement precision is insufficient for detecting minute moisture changes
Solution Approach 1:
The patent transitions from single-reflection light detection to multiple-reflection light detection, effectively adding temporal and spatial dimensions to the light-object interaction. By causing light to reflect multiple times between the sheet and reflecting members, the system accumulates moisture absorption effects over multiple passes, significantly enhancing detection sensitivity for minute moisture changes while maintaining a relatively compact device structure.
Solution Approach 2:
The patent implements continuous light reflection between the sheet and reflecting members, creating multiple opportunities for moisture absorption detection. Instead of a single discrete measurement event, the continuous bouncing of light provides ongoing interaction with the moisture-containing sheet, amplifying the detectable signal change and improving measurement precision without requiring complex scanning or multiple sensors.
2Measurement precision
If light reflection次数 is increased to improve detection accuracy, then measurement precision improves, but light loss increases
Solution Approach 1:
The patent introduces reflecting members as intermediaries to manage light propagation. These members redirect light back toward the sheet multiple times, ensuring that light maintains its path and continues to interact with moisture. The reflecting members preserve light intensity by preventing direct absorption or scattering losses that would occur in uncontrolled reflection scenarios, thereby enabling multiple reflections without proportionally increasing energy loss.
Solution Approach 2:
The patent optimizes the optical parameters of the system, including selecting appropriate wavelengths for moisture absorption and adjusting the geometry of reflecting members to maximize light return. By carefully controlling these parameters, the system achieves multiple reflections while minimizing cumulative light loss, maintaining sufficient signal strength for accurate detection even after multiple bounces.
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
The proposed sensor design significantly improves detection accuracy, allowing for precise moisture measurement and enabling effective curl correction and transfer current control, thereby enhancing image quality and consistency.
Implementation Method 1
light at a wavelength that is most easily absorbed by moisture is extracted from the light emitted from the light source by the wavelength filter
Implementation Method 2
a light-receiving element configured to receive light that is multiple reflected between the object and the first reflecting member
Implementation Method 3
a first reflecting member configured to reflect light reflected from the object toward the object
Data Source
AI summary
A moisture sensor detects moisture in an object. A first light-emitting element emits light. A first reflecting member reflects light reflected from the object toward the object. Alight-receiving element receives light that is multiple reflected between the object and the first reflecting member. A controller determines an amount of moisture in the object based on a light reception result from the light-receiving element.