Segmented Polarizing Filter for Lens Axis Detection
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Solution Overview
Problem
Existing methods for determining the orientation of a polarized lens's polarization axis are costly and require precise, controlled rotation, making them expensive and complex for accurate measurement.
Innovation Solution
A polarizing filter with multiple areas, each having a distinct polarization axis, allows for simultaneous detection of various orientations without the need for relative movement between the filter and lens, using a static setup with a light source and intensity measuring device to determine the lens's polarization axis based on varying light intensities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single polarizing filter with fixed orientation is used to detect lens polarization axis, then measurement precision is improved, but device complexity and cost increase due to required controlled rotation mechanisms
Solution Approach 1:
The polarizing filter is divided into multiple independent areas (first area, second area, third area), each with a different fixed polarization axis orientation. This segmentation eliminates the need for mechanical rotation while enabling detection of multiple orientation angles simultaneously, resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
Instead of using a single filter that rotates in one dimension (angular position), the invention uses multiple filter areas with different polarization orientations arranged in space. This transforms the problem from temporal-scan-based detection to spatial-parallel detection, eliminating mechanical complexity while maintaining measurement accuracy.
2Measurement precision
If multiple measurements at different angles are taken by rotating the filter, then measurement precision is improved, but productivity decreases due to time-consuming rotation and multiple measurements
Solution Approach 1:
The filter is segmented into multiple areas with different fixed orientations, allowing simultaneous capture of polarization information at multiple angles in a single measurement. This eliminates the need for sequential rotation and multiple measurements, thereby improving productivity while maintaining precision.
Solution Approach 2:
The invention enables continuous detection capability by having multiple filter areas actively measuring different orientations simultaneously, rather than sequentially scanning through angles. This continuous parallel action increases productivity without sacrificing measurement precision.
3Measurement precision
If a controlled rotation system with constant reference point is used, then measurement precision is improved, but ease of operation worsens due to requirement for smooth and precise movement control
Solution Approach 1:
The filter is divided into multiple static areas with predetermined polarization orientations. This eliminates the need for dynamic rotation control and reference point maintenance, making the system easier to operate while preserving measurement precision through the fixed geometric relationships between areas.
Solution Approach 2:
Instead of keeping the filter stationary and rotating the lens (or vice versa) to achieve different measurement angles, the invention inverts the approach by having multiple filter areas with different fixed orientations. This eliminates the need for precise movement control while maintaining the ability to measure at multiple angles.
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
Enables easy, accurate, and cost-efficient determination of the lens's polarization axis without the need for expensive machinery or precise rotation, facilitating efficient production of polarized eyeglasses.
Implementation Method 1
two polarization lenses with the same orientation of polarization (polarization axes aligned parallel to each other) allow light waves passing these lenses, while they block almost all light waves in case the lenses are rotated relative to each other by a 90° angle (polarization axes aligned perpendicular to each other)
Data Source
AI summary
The present invention is directed to a polarizing filter (20), comprising a plurality of areas (25) for passing light, each area (25) being separated from the others, wherein each of the areas (25) is a linear polarizer and at least two of the areas (25) have a different polarization axis. The present invention is further directed to an apparatus (1) for determining an orientation of a lens polarization axis of a polarized lens (31) and using said polarizing filter (20) as well as a method of determining an orientation of a lens polarization axis of a polarized lens (31) using said apparatus (1).