Multifocal Lens Diffractive Structures Overlap
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing multifocal intraocular and contact lenses with overlapping diffractive structures face complexity in calculation and manufacturing, leading to suboptimal light intensity distribution and image quality due to numerous profile peaks and non-useful focal points.
Innovation Solution
The use of two distinct diffractive structures with coinciding first-order focal points, one asymmetric and one symmetric around the refractive focal point, simplifies calculation and manufacturing by allowing for a higher intensity component in usable focal points, resulting in a more intensely colored and higher contrast image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If two diffractive structures with coinciding first order focal points are overlapped, then calculation and manufacturing are simplified, but the intensity distribution in focal points must be optimized
Solution Approach 1:
The patent divides the diffractive structure into two separate diffractive structures (first and second) that are overlapped. Each structure can be independently calculated and manufactured with standard profiles, avoiding the need to manufacture a single complex structure with multiple profile peaks. This segmentation resolves the contradiction by making each component simpler to manufacture while maintaining the ability to optimize overall intensity distribution through the overlap design.
Solution Approach 2:
The patent combines two diffractive structures with coinciding first order focal points to create a multifocal lens. By merging these structures at the same focal point location, the patent achieves simplified manufacturing (each structure uses standard profiles) while maintaining precise control over intensity distribution through the叠加 effect. This resolving the contradiction between ease of manufacture and manufacturing precision.
2Adaptability or versatility
If diffractive structures with multiple profile peaks are incorporated, then multiple focal points are achieved, but manufacturing complexity increases and light intensity distribution becomes suboptimal
Solution Approach 1:
The patent segments the multifocal functionality into two separate diffractive structures, each with simpler profile characteristics. Instead of creating a single complex structure with multiple profile peaks for different focal points, the patent uses two structures that can be overlapped to achieve the same effect. This reduces the complexity of individual structures while maintaining multiple focal points through the overlap configuration.
Solution Approach 2:
Instead of creating a single diffractive structure with multiple profile peaks to achieve multiple focal points, the patent inverts the approach by using two simpler structures with coinciding focal points. This inversion resolves the contradiction by achieving multiple focal points through the overlap of two simple structures rather than through a single complex structure with multiple peaks.
3Adaptability or versatility
If negative order diffractive focal points are present, then additional focal points are created, but image quality deteriorates due to non-useful focal points behind the retina
Solution Approach 1:
The patent applies local quality by designing the diffractive structures to have asymmetric intensity distributions that concentrate light into specific useful focal points (positive orders for near and intermediate vision, or negative orders depending on refractive focal point usage). By optimizing the local intensity distribution at each focal point location, the patent enhances useful focal points while minimizing light directed to non-useful negative order focal points that would degrade image quality.
Solution Approach 2:
The patent employs asymmetric diffractive structures with non-symmetric intensity distributions around the refractive focal point. This asymmetry allows preferential directing of light intensity into useful focal points (positive or negative orders based on application) while reducing intensity in non-useful focal points. The asymmetric design resolves the contradiction by tailoring the local light distribution to enhance image quality in useful focal regions while suppressing harmful effects from non-useful focal points.
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 approach enhances image quality by shifting non-useful negative order focal points to positive orders, increasing light yield and contrast, while reducing manufacturing complexity and costs through simpler profile curves and apodization.
Implementation Method 1
a first and a second diffractive structure, which at least partially overlap
Implementation Method 2
a refractive focal point and a first and a second diffractive structure
Data Source
AI summary
The invention relates to a multifocal lens (1), in particular an intraocular lens or contact lens, having a refractive focus (Fr) and a first and a second diffractive structure (6, 7) that at least partially overlap, said two diffractive structures (6, 7) being different. A first order focus (F1;1) of the first diffractive structure (6) coincides with a first order focus (F2,1) of the second diffractive structure (7). The invention further relates to a method for producing such a multifocal lens (1).