Optical Equipment Design Optimizing Lens-Frame Geometry

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Solution Overview

Problem

Existing methods for tailoring optical equipment to a wearer's morphological parameters often compromise the optical, mechanical, and aesthetic qualities, leading to potential damage or discomfort due to improper fit and geometry adjustments.

Innovation Solution

A method and device that optimize the geometry of optical lenses and spectacle frames by minimizing a global cost function, which is a weighted sum of optical, comfort, and mechanical interaction functions, using a processing device to determine the best compromise between these parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the geometry of the spectacle frame is modified to fit the wearer's morphological parameters, then the fit and comfort are improved, but the optical function and mechanical integrity of the optical lens may be compromised

Engineering Contradiction:

Improvefit and comfortVSAvoidoptical function and mechanical integrity

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The invention changes multiple parameters simultaneously (frame geometry, lens geometry, material properties) to achieve a balanced optimization. The cost function evaluates and adjusts parameters like frame shape, lens thickness, and material characteristics to find the optimal configuration that satisfies both comfort and reliability requirements

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention implements a feedback mechanism through the cost function evaluation system. The system continuously evaluates the optical cost function, comfort cost function, and mechanical interaction cost function, then adjusts the design parameters iteratively to minimize the global cost function, ensuring that modifications to improve comfort do not compromise optical function or mechanical integrity

Inventive Principle:

Principle #23Feedback

2Measurement precision

If large spectacle frames are used for strong myopia correction, then the optical correction capability is improved, but the lens edges may contact frame components causing damage

Engineering Contradiction:

Improveoptical correction capabilityVSAvoidmechanical damage risk

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The invention applies preliminary anti-action by predicting potential mechanical contact between thick lens edges and frame components before the damage occurs. The mechanical interaction cost function evaluates the risk of contact between lens periphery and frame parts (hinges, temples, nose pads) and adjusts the design to prevent such harmful interactions in advance

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The invention applies local quality by differentiating the optimization requirements for different regions of the optical system. The lens periphery requires sufficient thickness for structural integrity and optical correction, while the contact areas with frame components are specifically analyzed to prevent mechanical damage, allowing different local optimizations throughout the system

Inventive Principle:

Principle #3Local quality

3Shape

If the lens periphery is made thinner for aesthetic purposes, then the aesthetic appeal is improved, but the mechanical strength and resistance to damage during manufacturing are reduced

Engineering Contradiction:

Improveaesthetic appealVSAvoidmechanical strength

Core Design Contradiction:

ShapeVSStrength

Solution Approach 1:

The invention changes the lens thickness parameter as a continuous variable that can be optimized to different values in different regions. The system allows the lens periphery to be thinner for aesthetic purposes while maintaining sufficient thickness in critical areas through the integrated optimization of geometrical and material parameters

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention considers using composite materials or material with varying properties throughout the lens structure. By optimizing material characteristics alongside geometry, the system can achieve both aesthetic appeal with thinner periphery and mechanical strength through strategic material distribution or selection

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP3881128B1Method for determining an optical equipment adapted to a wearer and processing device for determining an optical equipment adapted to a wearer

Publication Date: 2025.06.25 ESSILOR INTERNATIONAL(COMPAGNIE GENERALE D OPTIQUE)

Figure 1~3

AI summary

In order to determine an optical equipment (1) adapted to a wearer and comprising an optical lens (3, 7) and a spectacle frame (5), a method implemented by a processing device comprises steps of: - providing data relative to the wearer comprising optical requirements of the wearer, - providing an optical cost function (O) related to an optical function parameter of optical lens (3, 7) and being defined based at least on part of data relative to the wearer, - providing a comfort cost function C related to a comfort parameter, - providing a mechanical interaction cost function M that varies as a function of a geometrical parameter of spectacle frame (5) and a geometrical parameter of optical lens (3, 7), - determining an optical equipment (1) that minimizes a global cost function G, global cost function G being a weighted sum of all cost functions. A corresponding processing device is also described.