Asymmetric Stripe Pattern Marker for Compact Visual Angle Detection
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Solution Overview
Problem
Conventional planar visual markers with a variable moire pattern and lens array require a large area due to symmetry constraints, making them less usable in human living environments where a smaller size is desired for aesthetic and practical reasons.
Innovation Solution
A marker with a stripe pattern on a two-dimensional plane and a lens array, where the lens array is placed on the surface or back of the substrate, allowing for a smaller area configuration by forming variable moire patterns that change direction, enabling measurement of visual line angles with reduced size requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dot pattern with lens array is used to measure visual line angles, then measurement precision is improved, but the area required increases due to symmetry constraints
Solution Approach 1:
The patent applies asymmetry by using a stripe pattern instead of a symmetric dot pattern. The stripe pattern has different characteristics in different directions, allowing the lens array to measure visual line angles without requiring the marker to be square or have equal longitudinal and lateral dimensions. This asymmetric approach maintains measurement precision while reducing the overall marker area.
Solution Approach 2:
The patent changes the pattern parameter from circular dots to linear stripes. This parameter change allows the pattern to provide directional information inherently through the stripe orientation, eliminating the need for symmetric arrangements of multiple dot patterns. The stripe pattern's linear geometry enables angle measurement with fewer elements and smaller area.
2Area of stationary object
If a stripe pattern with lens array is used, then the area is reduced, but manufacturing complexity increases due to multiple formation steps
Solution Approach 1:
The patent merges the pattern formation and lens array placement into an integrated manufacturing process. By forming the stripe pattern directly on the lens substrate or integrating it with the lens array structure, the patent reduces the number of separate manufacturing steps. This merging approach minimizes alignment complexity and reduces overall manufacturing complexity despite the asymmetric stripe pattern design.
3Ease of manufacture
If the lens array is placed on the top surface of the lens substrate, then ease of manufacture is improved, but the pattern visibility may be reduced
Solution Approach 1:
The patent applies local quality by forming the stripe pattern specifically in the regions where it is needed for measurement, rather than covering the entire substrate. The pattern is localized to functional areas, and the lens array is positioned to optimize both visibility and manufacturing ease. This localized approach ensures that the pattern remains visible while simplifying the manufacturing process.
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 solution allows for the measurement of object position and posture with a smaller area, reducing the size and cost of the marker while maintaining functionality, and providing a more versatile and aesthetically pleasing design.
Implementation Method 1
a lens array in which a plurality of lenses are arranged on the two-dimensional plane having the stripe pattern
Implementation Method 2
A planar visual marker includes a variable moire pattern having a gray level pattern changing depending on a direction along which the pattern is visually recognized
Data Source
AI summary
Provided are a marker that enables, within a smaller area size, measurement of the position or the attitude of an object, and a marker manufacturing method. The marker is provided with a variable moire pattern 3 that includes a striped pattern 9 which is formed on a two-dimensional plane and a lens array 7 in which a plurality of lenses are arranged on the two-dimensional plane on which the striped pattern 9 is formed.