Optical Sensor Multiple Light Intensities Paper Detection
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Solution Overview
Problem
Conventional optical sensors in printing and copying devices face issues with contamination, manufacturing tolerances, and efficiency degradation, leading to inaccurate paper detection and increased downtime, requiring frequent servicing and additional costs.
Innovation Solution
An optical sensor system with multiple light emitters and detectors that cycle through different light intensities and sensitivities, allowing a controller to analyze data for accurate paper presence detection, reducing false positives and improving detection accuracy over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single light intensity is used for paper detection, then the system is simple to operate, but detection accuracy deteriorates under varying conditions (contamination, component wear, different paper types)
Solution Approach 1:
The optical sensor dynamically switches between multiple light intensity levels (first light intensity and second light intensity) based on detection needs. The controller selectively activates different light intensities to adapt to varying detection conditions, such as contamination levels or component wear, thereby maintaining high detection accuracy without requiring a completely complex multi-sensor system.
Solution Approach 2:
The system changes the light intensity parameter to optimize detection under different conditions. By using at least two distinct light intensity levels, the sensor can adjust its operating parameters to compensate for contamination, component degradation, or variations in paper properties, improving measurement precision without adding significant device complexity.
2Measurement precision
If high light intensity is used to detect dark printing, then detection capability improves, but false positives increase due to light reflection from machine elements
Solution Approach 1:
The optical sensor dynamically adjusts light intensity levels based on detection requirements. By switching between a first light intensity and a second light intensity (higher than the first), the system can optimize detection for dark printing while minimizing false positives from light reflection off machine elements.
Solution Approach 2:
The controller selectively activates different light intensities in a periodic or alternating manner, allowing the system to compare detection results across multiple intensity levels. This periodic variation helps distinguish true paper presence signals from false reflections, improving detection reliability.
3Reliability
If conventional optical sensors are used, then the system is simple in structure, but detection reliability deteriorates over time due to contamination and component wear
Solution Approach 1:
The optical sensor incorporates dynamic light intensity switching capability, allowing it to adapt to degradation over time. By selectively using different light intensity levels, the system can compensate for contamination and component wear, maintaining reliable detection performance without requiring frequent servicing or replacement.
Solution Approach 2:
The optical sensor is designed with multi-functionality by incorporating at least two different light intensity levels within a single sensor system. This universal design allows the same sensor to handle various detection scenarios (clean conditions, contaminated conditions, different paper types) without requiring multiple specialized sensors, thereby improving reliability while controlling 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
Enhances the accuracy and reliability of paper detection in printing devices, reducing false positives and maintaining performance even with contamination or component wear, thereby minimizing downtime and maintenance costs.
Implementation Method 1
an optical sensor having a light emitter that emits light to illuminate the paper path
Implementation Method 2
a light detector that detects light reflected from or blocked by the paper path
Implementation Method 3
a light detector that detects light reflected from or blocked by the paper path
Data Source
AI summary
An imaging apparatus including an imaging system and an optical sensor for detecting a print medium within a paper path. The optical sensor may include at least one light emitter and at least one light detector. The light detector is configured to output two or more light intensities sequentially onto the paper path, which reflects from the paper path or transmits directly onto the optical sensor. Data indicating an amount of light received by the at least one light detector is received by the controller, which performs data analysis to determine the presence or absence of a print medium in the paper path.