Rotatable Half-Wave Plate Polarizer for Adjustable Light Filtering
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Solution Overview
Problem
Existing ophthalmic devices lack efficient mechanisms to adjust filtering properties for polarized light beams, particularly in filtering out polarized components while maintaining transmittance of non-polarized components.
Innovation Solution
An ophthalmic device comprising a rotatable half-wave plate and polarizer, where the half-wave plate adjusts the polarization plane of the polarized beam, and the polarizer filters based on this adjustment, allowing for adjustable filtering properties without significantly affecting the transmittance of non-polarized components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotatable polarizer is used to adjust filtering properties for polarized light, then the filtering adjustability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The device segments the polarization control function into two distinct components: a fixed polarizer and a rotatable half-wave plate. This segmentation allows each component to have a specialized function - the polarizer provides the filtering baseline while the half-wave plate provides the adjustment mechanism, simplifying the overall design compared to using a single complex rotatable polarizer.
Solution Approach 2:
The half-wave plate acts as an intermediary element between the fixed polarizer and the incoming polarized light. By rotating the half-wave plate, the polarization plane of the light is modified before it reaches the polarizer, enabling adjustable filtering without requiring the polarizer itself to rotate. This intermediary approach simplifies the mechanical design.
2Manufacturing precision
If a rotatable polarizer is used to filter polarized light, then filtering precision is improved, but the ease of manufacture decreases
Solution Approach 1:
By separating the filtering function (fixed polarizer) from the adjustment function (rotatable half-wave plate), the manufacturing process is simplified. The fixed polarizer can be manufactured with high precision for accurate filtering, while the half-wave plate mechanism can be a simpler rotational component, making the overall device easier to manufacture than a single complex rotatable polarizer.
Solution Approach 2:
The invention replaces the complex mechanical system of a rotatable polarizer with a combination of a fixed polarizer and a rotatable half-wave plate. This substitution simplifies the mechanical requirements - instead of rotating the entire polarizer assembly, only a thinner half-wave plate needs to rotate, reducing mechanical complexity and improving ease of manufacture while maintaining filtering precision.
3Adaptability or versatility
If a liquid crystal polarization rotator is used to change hue or chroma, then the filtering adjustability is improved, but the device complexity and cost increase
Solution Approach 1:
The invention replaces the electronic liquid crystal polarization rotator with a mechanical half-wave plate rotation system. Instead of using electronically controlled liquid crystals to change polarization, the patent uses a simple mechanical rotation of a half-wave plate, which is optically passive. This substitution reduces device complexity, eliminates the need for power supply and electronic control systems, and lowers cost while achieving the same filtering adjustability.
Solution Approach 2:
The mechanical half-wave plate system uses simple, inexpensive optical components compared to liquid crystal devices. The half-wave plate is a passive optical element that can be manufactured at low cost, and the mechanical rotation mechanism is simpler and cheaper than electronic liquid crystal control systems, making the overall device more economical.
4Manufacturing precision
If the polarizer rotates to adjust filtering, then the filtering precision is improved, but the overall transmittance of non-polarized components changes
Solution Approach 1:
The half-wave plate serves as an intermediary that modifies the polarization state of light before it reaches the fixed polarizer. For polarized components, rotating the half-wave plate changes the angle between the polarization plane and the polarizer axis, enabling precise filtering control. For non-polarized components, the half-wave plate has minimal effect, so their transmittance remains relatively constant. This intermediary approach allows filtering precision improvement without significant transmittance variation for non-polarized light.
Solution Approach 2:
The device applies different effects to different components of the incoming light: the half-wave plate rotation selectively affects polarized components by changing their polarization angle, while having minimal impact on non-polarized components. This local quality approach - where the adjustment mechanism differentially affects different light components - enables precise filtering control for polarized light while maintaining consistent transmittance for non-polarized light.
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 device effectively filters polarized components while maintaining consistent transmittance of non-polarized components, providing adjustable filtering properties with mechanical simplicity and robustness.
Implementation Method 1
the half-wave plate, when rotated by a predetermined angle, rotates the polarization plane of the polarized beam of light passing through the half-wave plate by twice this predetermined angle
Implementation Method 2
The polarizer then cuts, or in other words filters, the polarized beam of light depending on this angle
Data Source
AI summary
Disclosed is an ophthalmic device having adjustable filtering properties, including at least one polarizer and at least one half-wave plate that is rotatable with respect to the polarizer to thereby adjust the filtering properties for a polarized beam of light that successively meets the half-wave plate and then the polarizer.