Recording Medium Determination Using Multi-Wavelength Inspection
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Solution Overview
Problem
Conventional recording medium determination devices face challenges in accurately determining the class of a recording medium when the amount of received light varies due to factors other than the property being targeted, leading to potential erroneous classifications.
Innovation Solution
A recording medium determination device that uses a light emitter to emit inspection light and a light detector to detect diffuse reflected light and fluorescent light, with a hardware processor making determinations based on the detection results from first and second inspection lights of different wavelengths, where the first inspection light has a peak wavelength between 750 nm and 1100 nm, and the second inspection light has a peak wavelength shorter than the first, allowing for more accurate classification by considering wavelength dependency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If inspection light in a single wavelength region is used to detect recording medium properties, then the determination process is simple, but accurate determination becomes difficult when received light amount varies due to factors other than the targeted property
Solution Approach 1:
The patent divides the inspection into multiple wavelength regions (first wavelength region with peak 750-1100 nm, second wavelength region with shorter peak wavelength). By segmenting the measurement into different spectral bands, the system can distinguish between variations caused by basis weight and variations caused by targeted properties like fluorescent whitening agents, thereby improving determination accuracy without excessive complexity
Solution Approach 2:
The patent adds a wavelength dimension to the inspection by using multiple wavelength regions. Instead of relying on a single measurement dimension (light amount at one wavelength), the system measures light amounts across different wavelength dimensions, enabling it to differentiate between various causes of light amount variation and achieve more accurate property determination
2Measurement precision
If multiple wavelength regions are used for inspection, then determination accuracy improves, but device complexity increases
Solution Approach 1:
The patent uses a single light receiver that can detect light from multiple wavelength regions, making the detection device multi-functional. This universal approach allows the system to achieve improved determination accuracy through multi-wavelength inspection without proportionally increasing device complexity, as one detector performs multiple measurement functions
Solution Approach 2:
The patent changes the wavelength parameter of the inspection light to achieve different measurement objectives. By adjusting which wavelength region is used (first region for baseline, second region for specific property detection), the system can accurately determine various recording medium properties while maintaining a relatively simple device configuration
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 approach enables accurate determination of the recording medium's properties, reducing errors caused by variations in received light due to factors like basis weight, and ensures correct classification of the medium's class by offsetting influences from other factors.
Implementation Method 1
a light detector that detects incident light including at least one of diffuse reflected light of the inspection light emitted to the recording medium
Implementation Method 2
fluorescent light excited by the inspection light in the recording medium
Data Source
AI summary
A recording medium determination device includes a light emitter, a light detector, and a hardware processor. The light emitter emits inspection light to a recording medium. The light detector detects incident light including at least one of diffuse reflected light of the inspection light emitted to the recording medium and fluorescent light excited by the inspection light in the recording medium. The hardware processor makes a determination depending on a property of the recording medium based on a detection result of first incident light of the incident light in accordance with first inspection light of the inspection light and second incident light of the incident light in accordance with second inspection light of the inspection light obtained by the light detector. The second inspection light has an intensity whose peak wavelength is shorter than the peak wavelength of the first inspection light.