Achromatic Phase Doublet Electroactive Lens for Chromatic Aberration
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Solution Overview
Problem
Current optical systems, such as those used in augmented reality and virtual reality, tunable focus glasses, and camera lenses, suffer from chromatic aberrations due to the dispersion of refractive indices in lens materials, leading to issues like blurred images and long response times, high operation voltages, and mechanical adjustments.
Innovation Solution
An achromatic phase doublet is created using a combination of kinoform and harmonic lens phase functions in an electroactive lens, which reduces chromatic aberrations, decreases lens thickness, and lowers the required voltage for adjustment, allowing for faster response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional electroactive lenses are used to adjust focal length, then the lens can change focus, but chromatic aberrations occur due to dispersion of refractive index
Solution Approach 1:
The lens is divided into multiple independent zones with different phase functions (kinoform zones and harmonic lens zones). Each zone is controlled by separate electrodes, allowing independent adjustment of focal lengths for different wavelengths. This segmentation enables the lens to compensate for chromatic aberration by having different zones focus different wavelengths at the same focal point.
Solution Approach 2:
Different regions of the lens are assigned different phase functions tailored to specific wavelength ranges. The kinoform zones are optimized for certain wavelengths while harmonic lens zones are optimized for other wavelengths. This local optimization allows each region to contribute to correcting chromatic aberration for its designated wavelength range.
2Speed
If lens thickness is reduced to improve response time, then adjustment speed increases, but chromatic aberration compensation becomes more difficult
Solution Approach 1:
The patent changes the phase function parameters across different zones of the lens. By varying the phase depth and pattern (kinoform vs. harmonic) in different zones, the system achieves chromatic aberration correction without requiring increased lens thickness. The parameter variation is achieved through voltage control of electroactive materials, maintaining thin lens geometry while achieving precise wavefront control.
3Speed
If voltage on electrodes is increased to reduce response time, then adjustment speed improves, but energy consumption increases
Solution Approach 1:
The lens employs dynamic control where different zones are activated only when needed for specific wavelength ranges. The electroactive zones can be selectively switched on and off, allowing the system to achieve fast response times for specific adjustments without continuously applying high voltage across the entire lens. This dynamic activation pattern reduces overall energy consumption while maintaining fast response capability.
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 effectively minimizes chromatic aberrations, reduces lens thickness, and decreases the operational voltage, resulting in improved image quality and faster adjustment capabilities in optical systems.
Implementation Method 1
an electroactive lens including an electroactive material layer, wherein the electroactive lens may be configured to form a doublet phase function by applying a voltage to the electroactive material layer
Data Source
AI summary
An optical device including an achromatic phase doublet and a method of driving an optical device having reduced chromatic aberration is provided. The optical device includes an electroactive lens including an electroactive material layer, wherein the electroactive lens is configured to form a doublet phase function by applying a voltage to the electroactive material layer, the doublet phase function including a kinoform phase function and a harmonic lens phase function.