Optical Scanning Device Contour Curve Frequency Notch Elimination
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Solution Overview
Problem
Optical scanning devices, particularly in transport and feature detection systems, face challenges with spatial frequency sensitivity notches, leading to missing information at specific frequencies, which affects detection accuracy and medium sorting precision.
Innovation Solution
The optical scanning device employs a unique contour curve configuration for its passing region, dividing it into quadrilateral minute regions with varying widths, and using a specific contour curve equation to generate frequency signals, which reduces the occurrence of notches in the frequency signal, thereby enhancing detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional optical scanning device uses a standard light receiving element, then the device structure is simple, but spatial frequency sensitivity notches occur at specific frequencies causing information loss
Solution Approach 1:
The light receiving element is divided into multiple pixel elements arranged in specific patterns. This segmentation allows the device to capture spatial frequency information across different frequency ranges simultaneously, eliminating the notches that occur in conventional single-element designs where sensitivity drops at specific frequencies.
Solution Approach 2:
Different regions of the light receiving element have different functional properties. The pixel elements are arranged with varying spacing and orientation in different areas, creating local variations in frequency response. This ensures that each region contributes to different frequency bands, collectively providing uniform frequency coverage without notches.
2Measurement precision
If the light receiving element is divided into multiple pixel elements, then spatial frequency sensitivity is improved, but the device complexity increases
Solution Approach 1:
Multiple pixel elements are combined within a single light receiving element structure to function as one integrated sensing unit. The pixel elements are arranged in specific patterns that allow them to work together, merging their individual frequency responses to create a comprehensive frequency response curve without requiring multiple separate devices.
Solution Approach 2:
The light receiving element with multiple pixel elements serves multiple functions simultaneously: it detects various spatial frequencies, maintains compact form factor, and provides uniform coverage across the detection field. This multi-functionality is achieved within a single integrated structure, avoiding the need for complex multi-device systems.
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 solution increases the optical detection accuracy by minimizing the occurrence of notches in the frequency signal, ensuring sufficient information capture and improving the precision of feature detection and medium sorting.
Implementation Method 1
a light receiving element of the optical sensor, such as a photosensor, receives the reflected light of incoherent light beams emitted from a light emitting element
Data Source
AI summary
An optical scanning device includes a reflected-light passing unit having a passing region through which a portion of reflected light that is the scanning light reflected by the medium passes. An outer peripheral contour line of the passing region includes a contour curve configured with a set of points where coordinates in a direction orthogonal to a scanning direction are uniquely determined for the coordinates in the scanning direction. The contour curve renders a curve protruded toward the passing region. When a region in contact with the contour curve in the passing region is divided into a plurality of quadrilateral minute regions having equivalent areas and extending from the contour curve to a predetermined coordinate position in the scanning direction and are continuously arranged in the orthogonal direction, widths of the minute regions in the scanning direction are different for each location in the orthogonal direction.