Sheet Identification with Dual Pattern Lights for Fiber Direction
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Solution Overview
Problem
Existing sheet identification techniques struggle to accurately identify the fiber direction of a sheet due to the influence of surface asperities, as they estimate asperity magnitude while ignoring the fiber direction.
Innovation Solution
A sheet identification device projects first and second pattern lights with different dependencies on the fiber direction to form an identification image, allowing for the identification of both asperities and fiber direction through pattern light deformation analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the incident direction of light is set at a fixed angle (e.g., 45 degrees) with respect to the conveying direction to reduce variation in detection accuracy, then the detection accuracy variation is reduced, but the fiber direction cannot be identified because the influence of fiber direction on asperity magnitude estimation is ignored
Solution Approach 1:
The patent divides the light irradiation into multiple pattern lights with different incident directions (e.g., first pattern light at 45 degrees and second pattern light at -45 degrees). Each pattern light provides different information about the sheet surface, allowing separate analysis of asperity magnitude and fiber direction while maintaining detection accuracy
Solution Approach 2:
The patent adds the dimension of multiple incident directions by projecting pattern lights from different angles. This transforms the single-angle detection into multi-angle detection, enabling the system to extract both asperity magnitude and fiber direction information that cannot be obtained from a single incident direction
2Loss of information
If multiple pattern lights with different incident directions are projected to identify fiber direction, then fiber direction identification becomes possible, but the device complexity increases
Solution Approach 1:
The patent designs the light irradiation portion to perform multiple functions: it can project first pattern light, second pattern light, or both simultaneously depending on the identification needs. This multi-functional design allows the same hardware to achieve both asperity magnitude estimation and fiber direction identification without requiring separate dedicated systems
Solution Approach 2:
The patent combines the projection of first and second pattern lights into a single light irradiation portion that can control the emission of multiple pattern lights. By merging the control and projection functions into one integrated component, the system reduces overall device complexity while maintaining the capability to perform multi-directional pattern light projection
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 enhances the accuracy of identifying both asperities and fiber direction of the sheet, improving the overall identification process without reducing light sensitivity.
Implementation Method 1
a light irradiation portion that, when forming an identification image, projects first pattern light and second pattern light having different dependences on a fiber direction on an identification region
Data Source
AI summary
A sheet identification device includes a light irradiation portion. When forming an identification image, the light irradiation portion projects first pattern light (P11) and second pattern light (P12) having different dependences on a fiber direction of a surface of a sheet on an identification region (R1). The identification image is an image of the identification region (R1) of the surface of the sheet on which image formation or image reading is performed, which is used for identifying the fiber direction of the surface of the sheet.