Diffractive Multifocal Ophthalmic Lens Phase Amplitude Control
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Solution Overview
Problem
Diffractive multi-focal ophthalmic lenses struggle to effectively tune optical characteristics and set focal points with high precision, particularly in generating three or more focal points on the optical axis while minimizing noise from multi-order light.
Innovation Solution
A method involving the generation of a composite profile by overlapping starting profiles with adjustable phase and amplitude, allowing for precise control of light intensity distribution and optical characteristics, enabling the setting of at least three focal points at any position on the optical axis and reducing secondary light peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a diffractive multi-focal lens uses a standard Fresnel zone constitution with fixed zone pitches, then the lens can provide basic multi-focal functionality, but the degree of freedom for tuning optical characteristics and setting focal points with high precision is limited
Solution Approach 1:
The diffractive structure is divided into multiple independent zone groups, where each zone group can be independently designed and optimized. This segmentation allows precise control over light distribution to multiple focal points while maintaining manageable structural complexity through modular design approaches.
Solution Approach 2:
The patent employs variable zone pitches and phase shifts across different zone groups, deviating from the fixed Fresnel zone constitution. By changing parameters such as zone radius, zone pitch, and phase modulation depth in a controlled manner, the lens achieves high-precision focal point positioning and optimized light intensity distribution without excessive structural complexity.
2Adaptability or versatility
If the lens generates three or more focal points using conventional diffractive structures, then multi-focal functionality is achieved, but noise from multi-order light increases and optical characteristics cannot be effectively tuned
Solution Approach 1:
Different zone groups within the diffractive structure are assigned different local characteristics, including varying zone pitches, phase shifts, and diffraction efficiencies. This local quality variation enables selective enhancement of desired focal points while suppressing unwanted multi-order light, achieving effective optical characteristics tuning without excessive noise.
Solution Approach 2:
The diffractive structure incorporates dynamic phase modulation capabilities through variable phase shifts across zone groups. This dynamic approach allows the lens to adaptively control light distribution to multiple focal points, optimizing the balance between useful focal points and suppressing harmful multi-order light based on specific optical requirements.
3Reliability
If conventional diffractive multi-focal lenses are used, then basic multi-focal vision is provided, but visual performance is degraded by halo and glare effects
Solution Approach 1:
The patent converts the potentially harmful effect of multi-order diffraction into a beneficial feature by strategically designing zone groups to direct multi-order light toward desired focal points rather than allowing it to form unwanted secondary focal points. This transforms what would normally be noise into useful light distribution, reducing halo and glare while maintaining reliable visual 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
This approach enhances the degree of freedom in designing diffractive multi-focal ophthalmic lenses, improving visual performance by adjusting light intensity between focal points and suppressing multi-order light, thereby reducing halo and glare.
Implementation Method 1
a diffractive type multi-focal lens for which a plurality of focal points are formed based on the principle of diffraction
Implementation Method 2
a plurality of focal points are given by the mutual interference effect of light waves that passed through the plurality of diffractive structures (zones)
Implementation Method 3
generating an adjusted profile by adjusting phase or phase and amplitude of zones of the composite profile
Implementation Method 4
generating an adjusted profile by adjusting phase or phase and amplitude of zones of the composite profile
Data Source
Figure 1
Figure 2A~2D
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AI summary
A method for manufacturing a diffractive multi-focal ophthalmic lens capable of generating at least three focal points in an optical axis direction using a diffractive structure comprising a plurality of zones in a concentric circle form. A composite profile is generated by overlapping at least two starting profiles comprising a plurality of zones in a concentric circle form, and an adjusted profile is generated in which at least one of phase and amplitude is adjusted by employing a zone of the composite profile as a subject in order to set an intensity distribution in the optical axis direction and determine optical characteristics, to manufacture the diffractive multi-focal ophthalmic lens for which the adjusted profile is provided in at least a portion of the diffractive structure.