Gloss Measurement Apparatus for Moving Sheets
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Solution Overview
Problem
Current methods for measuring small-scale gloss on moving surfaces, such as paper or cardboard, face inaccuracies due to the surface movement during exposure and the complexity of measurement configurations involving cameras and stroboscopic flashes, leading to a need for improved accuracy and simplicity in gloss measurement.
Innovation Solution
An apparatus and method utilizing a small light spot detection system where a narrow light source and detector configuration allow for precise measurement of gloss on moving sheets by integrating light intensity over a short time window, achieving high spatial resolution through controlled spot size and detection time, enabling accurate measurement of small-scale gloss variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a camera with stroboscopic flash is used to capture moving surface, then gloss measurement is possible, but measurement accuracy deteriorates due to surface movement during exposure
Solution Approach 1:
The patent uses periodic stroboscopic illumination synchronized with the moving surface to capture gloss information at specific intervals, allowing measurement of moving surfaces while maintaining accuracy through timed periodic detection rather than continuous exposure
2Measurement precision
If a camera with detector matrix and stroboscopic flash is used, then gloss measurement capability is achieved, but device complexity increases
Solution Approach 1:
The patent extracts and focuses measurement on specific small areas of the surface using targeted illumination and selective detection, rather than requiring complex matrix detectors to capture entire surfaces, thereby simplifying the overall device configuration while maintaining measurement capability
3Manufacturing precision
If a small measured area is used for micro gloss measurement, then spatial resolution is improved, but measurement reliability deteriorates due to surface movement
Solution Approach 1:
By using periodic stroboscopic illumination synchronized with surface movement, the system can capture reliable gloss data from small specific areas at defined time intervals, simultaneously achieving high spatial resolution and measurement reliability through temporal synchronization
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 allows for precise measurement of small-scale gloss variations, enhancing process control by providing accurate and reliable data on surface texture and gloss, addressing the limitations of existing methods by improving spatial resolution and measurement accuracy.
Implementation Method 1
Surface gloss is conventionally measured as a specular reflection of visible light from a relatively large area
Data Source
Figure 1A~1C
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AI summary
An apparatus of measuring a small scale property of a sheet, the apparatus comprises: a first light source for illuminating the sheet moving with respect to the illumination; a detector for forming a total intensity of reflection of the light illuminating the moving sheet by each detection; a detected dimension of the reflection on the sheet in the direction of the movement being limited the same as or shorter than a lowest acceptable spatial resolution of the measurement;a duration of each detection being equal to or shorter than the lowest acceptable spatial resolution divided by a speed of the moving sheet; and a processing unit for forming information about a small scale variation of gloss of the sheet on the basis of the detections by the detector.