Sheet Surface Identification Using Orthogonal Pattern Light
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Solution Overview
Problem
Existing sheet identification devices in image forming apparatuses are restricted in light irradiation portion arrangement, necessitating a 45-degree angle for reduced variation in detection accuracy due to fiber direction, which results in reduced sensitivity and dark images with noise interference.
Innovation Solution
The device projects pattern light with orthogonal components along and orthogonal to the sheet's conveying direction, allowing for improved flexibility in light irradiation arrangement and enhanced asperity detection accuracy by capturing a brighter identification image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the incident direction of light is set at 45 degrees with respect to the conveying direction of the sheet, then the variation in detection accuracy depending on fiber direction is reduced, but the arrangement of the light irradiation portion is restricted and detection sensitivity decreases
Solution Approach 1:
The light irradiation is segmented into multiple directions: a first light irradiation in a first direction and a second light irradiation in a second direction different from the first direction. This segmentation allows the system to overcome the limitation of single-direction irradiation and achieve accurate surface state identification without being constrained to a fixed 45-degree arrangement.
Solution Approach 2:
The patent introduces multi-directional light irradiation by adding a second irradiation direction different from the first direction. This dimensional expansion in the irradiation approach enables the system to capture surface information from multiple angles, thereby improving arrangement flexibility while maintaining detection accuracy.
2Measurement precision
If the incident direction of light is set at 45 degrees with respect to the conveying direction of the sheet, then the variation in detection accuracy depending on fiber direction is reduced, but the image brightness decreases and noise interference increases
Solution Approach 1:
The illumination is divided into multiple directional components (first light irradiation and second light irradiation). By segmenting the light source into multiple directions, the system captures brighter reflected light from different angles, thereby improving image brightness while maintaining the accuracy benefits of multi-angle observation.
Solution Approach 2:
The patent adds another dimension to light irradiation by introducing a second irradiation direction. This multi-dimensional approach increases the total light reflected into the detection system, resulting in brighter images with reduced noise interference while preserving detection accuracy.
3Adaptability or versatility
If multi-directional light irradiation is implemented, then the flexibility in arrangement of light irradiation portion is improved, but the device complexity increases
Solution Approach 1:
The light irradiation portion is designed with multi-functionality, capable of irradiating light in multiple directions (first direction and second direction). This universal design allows a single light irradiation portion to perform multiple irradiation functions, thereby improving arrangement flexibility without proportionally increasing device 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
This configuration enhances the flexibility and accuracy of identifying sheet asperities and fiber direction without the limitations of fixed angles, resulting in improved detection and reduced noise interference.
Implementation Method 1
a light irradiation portion that, when forming an identification image, projects on an identification region pattern light including a vertical component along a conveying direction of a sheet and a horizontal component orthogonal to the vertical component
Data Source
AI summary
A sheet identification device includes a light irradiation portion. When forming an identification image (Im1), the light irradiation portion projects, on an identification region (R1), pattern light (P1) including a vertical component (C1) along a conveying direction (D1) of a sheet and a horizontal component (C2) orthogonal to the vertical component (C1). The identification image (Im1) is an image of the identification region (R1) of the surface of the sheet on which image formation or image reading is performed, and is used for identifying surface information on the state of the surface of the sheet.