Zonal Optical Elements Suppressing Chromatic Aberration
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Solution Overview
Problem
Zonal optical elements, such as diffractive Fresnel lenses, suffer from significant chromatic aberration when interacting with white light, leading to rainbow effects and inadequate homogeneity in angular and intensity distribution, which existing techniques like the RGB method and noise implementation struggle to fully address without compromising light directionality or increasing scattering.
Innovation Solution
Incorporating noise-introducing features, specifically zonal displacement and modulation, into the zone structure of zonal optical elements to enhance chromatic and directional homogeneity, allowing for improved light homogenization and reduced aberration while maintaining desired angular and intensity distribution characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional Fresnel lenses are used, then light focusing and collimation functions are achieved, but chromatic aberration occurs causing rainbow effects and poor chromatic homogeneity
Solution Approach 1:
The patent applies parameter changes by introducing random displacements and modulations to the zone structures, transforming the deterministic geometric parameters into stochastic variables. This statistical modification of zone parameters suppresses chromatic aberration while preserving the overall focusing function of the Fresnel lens.
Solution Approach 2:
The patent implements local quality by applying different modifications to different zones. Each zone can have unique displacement and modulation characteristics, allowing localized optimization to reduce chromatic effects while maintaining global optical functionality.
2Object-affected harmful factors
If noise-introducing features are added to zones, then chromatic homogeneity is enhanced, but device complexity increases
Solution Approach 1:
The patent uses parameter changes by defining zones through stochastic parameters (random displacements and modulations) rather than fixed geometric definitions. This approach enhances chromatic homogeneity while the parameters remain manageable through mathematical descriptions rather than requiring complex physical structures.
3Object-affected harmful factors
If existing noise implementation techniques are used, then some chromatic aberration is reduced, but light scattering increases and directional homogeneity deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the statistical characteristics of zone displacements and modulations. By optimizing the distribution parameters and magnitude of random variations, the patent reduces chromatic aberration while maintaining sufficient directional homogeneity for practical applications.
Solution Approach 2:
The patent implements local quality by allowing different zones to have different displacement and modulation characteristics. This localized optimization enables some zones to contribute more to chromatic aberration reduction while others maintain better directional control, achieving a balanced overall performance.
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 introduction of noise-introducing features in the zone structure effectively suppresses chromatic aberration and enhances the homogeneity of light distribution, ensuring that white light appears uniform and directed, with reduced scattering, thus addressing the limitations of existing methods.
Implementation Method 1
diffractive Fresnel lenses... its optical function is driven more by the principle of diffraction rather than that of refraction
Implementation Method 2
The zone structure of a zonal optical element based on diffraction and/or refraction principles
Implementation Method 3
Fresnel lenses... refracts light almost identically to the original lens... focus, collimate, partially collimate, diverge, etc an incoming light beam
Data Source
AI summary
An optical element, e.g. based on a diffractive Fresnel lens, having suppressed or reduced chromatic aberration under non-monochromatic light and/or enhanced directional homogenisation in its angular irradiation characteristics, comprises a plurality of optical zones (10, 20), wherein each zone comprises at least one homogenising noise-introducing feature. In embodiments the at least one homogenising noise-introducing feature comprises one or more zonal displacement features, e.g. ripples (20′, 20″) and/or one or more zonal modulation features, e.g. one or more patterning features (30).