Gloss Evaluation Apparatus Standardizing Specular Light Intensity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing gloss evaluation apparatuses produce varying measurement values for the same object due to differences in light sources, light receiving elements, and environmental conditions, leading to inconsistencies in gloss evaluation.
Innovation Solution
A gloss evaluation method and apparatus that calculate a gloss evaluation value by obtaining the intensity of specular light and spectral reflectance of diffuse reflection light using multiple illumination sources and detection units, with one source emitting light at a different angle, to standardize the measurement and reduce variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a specular glossiness measurement method is used to measure light reflected in a specular direction, then the measurement process is simple and quick, but the measured value does not conform to visual glossiness subjectively evaluated by humans
Solution Approach 1:
The patent combines multiple measurement approaches by integrating specular light intensity measurement with diffuse reflection light measurement (luminance and saturation). This merging of measurement methods allows the system to maintain quick measurement capability while achieving results that conform to human visual evaluation of glossiness.
Solution Approach 2:
The patent creates a composite evaluation value by combining multiple light measurement components (specular light intensity, diffuse reflection luminance, and saturation). This composite approach mirrors the complexity of human visual perception and produces glossiness evaluation that better matches subjective human assessment while maintaining measurement efficiency.
2Duration of action of stationary object
If a gloss evaluation apparatus is used for a long time, then continuous measurement capability is achieved, but different evaluation values are output for the identical object due to temporal changes in light source and light receiving element
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring the spectral irradiance of the light source and the sensitivity characteristics of the light receiving element. This feedback information is used to dynamically correct measurement values, compensating for temporal changes and individual differences in components, thereby maintaining measurement consistency over long periods of continuous operation.
Solution Approach 2:
The patent dynamically adjusts measurement parameters based on detected changes in light source spectral irradiance and light receiving element sensitivity. By changing correction parameters in real-time based on component degradation or drift, the system maintains reliable and consistent gloss evaluation values even during extended continuous measurement operations.
3Measurement precision
If multiple measurement parameters (specular light, diffuse reflection light) are used to improve gloss evaluation accuracy, then conformity to visual glossiness is improved, but the device complexity increases
Solution Approach 1:
The patent designs the measurement system with multi-functional components that can perform multiple measurement tasks. The same optical system and detectors are used to measure both specular light intensity and diffuse reflection characteristics (luminance and saturation), reducing the need for separate dedicated measurement systems and thereby limiting the increase in device complexity.
Solution Approach 2:
The patent employs dynamic measurement capabilities where the system can adaptively adjust measurement parameters and processing methods based on the specific sample being measured. This dynamic approach allows the system to optimize the balance between measurement accuracy and processing complexity, using full multi-parameter analysis only when necessary to achieve conformity with visual glossiness evaluation.
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 method and apparatus effectively reduce variations in gloss evaluation values by accounting for differences in light sources and environmental conditions, ensuring consistent measurements across different machines and environments.
Implementation Method 1
illumination light of spectral irradiance L(λ) emitted from a reference machine
Implementation Method 2
an intensity a of specular light, based on an intensity b of dispersed reflected light
Implementation Method 3
a spectral reflectance R(λ) of diffuse reflection light
Data Source
AI summary
In a gloss evaluation method and a gloss evaluation apparatus according to the present invention, an intensity P of specular light obtained by illuminating an object to be measured with illumination light of spectral irradiance emitted from the reference machine is obtained from an intensity of specular light obtained by illuminating the object to be measured with first illumination light of spectral irradiance from a relevant machine, based on an intensity b of dispersed reflected light obtained by illuminating the object to be measured with the first illumination light, and a spectral reflectance of diffuse reflection light obtained by illuminating the object to be measured with predetermined second illumination light from a different illuminating angle.