Spiral Aperture Filters for Moiré-Resistant Optical Detection
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Solution Overview
Problem
Conventional detection devices suffer from unintended moiré patterns due to misalignment between optical sensor arrangements and aperture alignments, leading to image distortion and reduced reliability.
Innovation Solution
The detection device incorporates an optical filter with apertures arranged spirally outward in both clockwise and counterclockwise directions from a predetermined area, ensuring precise alignment with optical sensors to minimize moiré formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If apertures are arranged in a conventional grid pattern to match optical sensors, then light transmission efficiency is improved, but unintended moiré patterns occur due to misalignment between aperture arrangement and sensor arrangement
Solution Approach 1:
The patent applies asymmetry by arranging apertures in a spiral pattern instead of a conventional symmetric grid pattern. This asymmetric spiral arrangement disrupts the periodic interference that causes moiré patterns while still maintaining efficient light transmission to the optical sensors arranged in a matrix configuration.
Solution Approach 2:
The patent employs curvature by using a spiral arrangement of apertures instead of straight-line grid patterns. The spiral configuration creates a curved, radial distribution of apertures that eliminates the linear periodicity responsible for moiré effects while preserving optical transmission efficiency.
2Measurement precision
If apertures are arranged to maximize light transmission, then detection sensitivity is improved, but moiré patterns increase due to alignment sensitivity
Solution Approach 1:
The asymmetric spiral pattern breaks the directional symmetry that makes conventional grid arrangements sensitive to alignment errors. The spiral configuration distributes apertures in multiple directions from a center point, making the overall pattern more robust to small misalignments during manufacturing while maintaining high detection sensitivity.
3Ease of manufacture
If a simple aperture pattern is used to reduce manufacturing complexity, then ease of manufacture is improved, but moiré reduction capability is insufficient
Solution Approach 1:
The spiral pattern, while more complex than a grid, can be manufactured using standard photolithography techniques with a simple mathematical definition. The curved spiral trajectory provides superior moiré reduction compared to simple linear patterns while remaining compatible with conventional manufacturing processes.
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 effectively reduces unintended moiré patterns, enhancing image clarity and reliability by maintaining consistent light transmission and reducing crosstalk between detection areas.
Implementation Method 1
an optical filter provided between the optical sensors and the object to be detected
Implementation Method 2
The optical filter includes a base configured not to transmit light and a plurality of apertures provided in the base and configured to transmit light
Data Source
AI summary
According to an aspect, a detection device includes: a plurality of optical sensors arranged in a matrix having a row-column configuration; and an optical filter provided facing a surface for detecting light with the optical sensors. The optical filter includes a base configured not to transmit light and a plurality of apertures provided in the base and configured to transmit light. An arrangement of the apertures in the base comprises an arrangement in which the apertures are arranged spirally outward clockwise from a predetermined area and arrangement in which the apertures are arranged spirally outward counterclockwise from the predetermined area. The predetermined area contains a predetermined point.