Double-Sided Composite Thinning Zoom Concave Lens Design
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Solution Overview
Problem
Conventional concave lenses for myopia do not effectively address the need for comfort across varying object distances and suffer from significant thickness and weight issues, particularly for high myopia patients, as they primarily utilize a single vision design with infinite object points and fail to adequately manage astigmatism.
Innovation Solution
A method for preparing a double-sided composite thinning zoom concave lens using mathematical models for the front and back surfaces, optimizing astigmatism and edge thickness through an evaluation function, and processing a substrate to achieve reduced edge thickness and improved zoom capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional single vision lens with spherical surface is used, then the astigmatism can be optimized when a certain base curve is satisfied, but the edge thickness and weight of the lens increase, reducing comfort for high myopia users
Solution Approach 1:
The patent applies aspheric surfaces on both the front and back of the lens, replacing conventional spherical surfaces. The aspheric coefficients Q1 and Q2 are specifically designed to optimize the lens shape, allowing for thinner edges while maintaining astigmatism correction. This curvature modification enables the lens to achieve both optical performance and reduced weight.
Solution Approach 2:
The patent changes the fundamental parameters of the lens design by introducing a zoom mechanism that allows the diopter to vary from -6.00D to -2.00D. Additionally, the aspheric coefficients and base curves are optimized as variables rather than fixed values, enabling the lens to adapt to different viewing distances and reduce edge thickness dynamically.
2Reliability
If a conventional single vision lens with infinite object point is used, then the prescription for optometry is met, but the lens cannot change diopter according to different object points, reducing eye comfort
Solution Approach 1:
The patent introduces a dynamic zoom mechanism that allows the lens diopter to change from -6.00D to -2.00D based on object distance. This dynamic adjustment capability enables the lens to adapt to different viewing conditions (near, intermediate, and far vision), significantly improving eye comfort while maintaining prescription accuracy through controlled optical power variation.
3Ease of manufacture
If a conventional spherical surface lens is used, then the manufacturing process is simple, but the edge thickness is large and zoom capability is limited
Solution Approach 1:
The patent employs aspheric surfaces on both lens faces with specifically designed aspheric coefficients. This allows the lens to achieve thinner edges through optimized curvature distribution while maintaining manufacturability using conventional lens grinding and polishing techniques adapted for aspheric surfaces.
4Device complexity
If a conventional single vision lens is used, then the structure is simple, but the zoom range is limited and astigmatism cannot be effectively eliminated across the entire lens diameter
Solution Approach 1:
The patent divides the lens into functional zones by applying different aspheric coefficients to the front surface (Q1) and back surface (Q2). This segmentation of optical functions across different lens regions enables effective astigmatism elimination across the entire 50mm diameter while maintaining a relatively simple single-lens structure without moving parts.
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 method results in a lens with reduced edge thickness by 20-30%, a ±4.00 D zoom range, and nearly eliminated astigmatism within a 50 mm diameter, enhancing user comfort and optical performance.
Implementation Method 1
establishing the a front surface mathematical model and a back surface mathematical model in an optical software... optimizing one by one using the least square method according to the evaluation function to obtain p1, p2 and A
Data Source
AI summary
A method for preparing the double-sided composite thinning zoom concave lens, includes steps of: S1: establishing the a front surface mathematical model and a back surface mathematical model in an optical software; S2: establishing an evaluation function comprising an optimized value of astigmatism and an edge thickness of the lens; and S3: inputting a structural parameters of the lens blank and the prescription power, optimizing one by one using the least square method according to the evaluation function to obtain data of a front surface and a rear surface of the lens.