Multifocal Diffractive Lens with Tuned Light Distribution
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Solution Overview
Problem
Existing multifocal ophthalmic lenses struggle with inefficient light distribution and limited design freedom, particularly for different pupil sizes, leading to reduced efficiency and user discomfort due to glare, halos, and miscalculations in optical power correction.
Innovation Solution
Designing a multifocal lens with a continuous periodic phase profile function that modulates the argument of the phase profile to tune light distribution in target focal points, using smooth transitions and periodic smoothened transitions to optimize light distribution for different pupil sizes, reducing manufacturing errors and enhancing user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional multifocal lens designs are used, then manufacturing is simpler, but light distribution efficiency decreases and user discomfort increases due to glare and halos
Solution Approach 1:
The patent applies parameter changes by modulating the argument of the continuous periodic phase profile function to optimize light distribution. Specifically, the argument modulation allows tuning of light distribution in target focal points for different pupil sizes, changing the optical parameters to achieve better efficiency while maintaining manufacturing feasibility through established lens fabrication processes.
2Adaptability or versatility
If conventional multifocal lens designs are used, then design freedom is limited, but manufacturing errors increase and optical power correction becomes inaccurate
Solution Approach 1:
The patent utilizes parameter changes through argument modulation of the phase profile function, which provides design freedom to optimize light distribution for different pupil sizes while maintaining manufacturing precision. The continuous periodic phase profile with argument modulation allows accurate optical power correction by precisely controlling the phase distribution across the lens aperture.
3Device complexity
If conventional multifocal lens designs are used, then device complexity is lower, but sensitivity to lens displacement increases and user comfort decreases
Solution Approach 1:
The patent applies parameter changes through argument modulation that creates a continuous periodic phase profile, which reduces sensitivity to lens displacement. The modulation design provides more stable optical performance across different pupil sizes and lens positions, improving reliability while maintaining reasonable device complexity through a single optical element design.
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 provides improved light distribution and reduced glare, halos, and sensitivity to lens displacement, while allowing for easier manufacturing and better optical power correction, resulting in enhanced user comfort and efficiency.
Implementation Method 1
a diffractive optical element, DOE, arranged at the front surface of the lens body (34) The diffraction grating or relief 36 provides a set of diffractive focal points
Implementation Method 2
The natural crystalline lens has a flexible, transparent, biconvex structure, and together with the cornea, operates to refract light to be focused on the retina
Data Source
Figure 1~2b
Figure 3~4
Figure 5a~5c
AI summary
An ophthalmic multifocal lens, and a method of manufacturing same, at least comprising focal points for near, intermediate and far vision. The lens comprises a light transmissive lens body providing a refractive focal point(164), and a periodic light transmissive diffraction grating, extending concentrically over at least part of a surface of the lens body and providing a set ofdiffractive focal points(162, 63). The diffraction grating is designed to operate as an optical wave splitter, the refractive focal point providing the focal point for intermediate vision (164) and the diffractive focal points providing the focal points for near (163) and far vision(162). The diffraction grating has an optical transfer function (160) comprising a continuous periodic phase profile function having an argument modulated as a function (165) of the radial distance (r) to the optical axis of the lens body, thereby tuning the light distribution in the focal points(162, 163, 164).