Ophthalmic Surface Compensation for Blocking-Induced Machining Deformation

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Solution Overview

Problem

Existing methods for manufacturing ophthalmic devices fail to accurately compensate for deformation defects caused by blocking during the machining process, leading to optical power errors and reduced precision.

Innovation Solution

A method that includes selecting a manufacturing method introducing a reproducible defect, determining a defect value using a predictive compensation model, and transforming the initial ophthalmic surface to compensate for deformation defects, thereby ensuring the ophthalmic device achieves the desired optical function.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If blocking is applied to hold the ophthalmic device during machining, then the device stability is improved, but deformation defects are introduced due to blocking forces

Engineering Contradiction:

Improvedevice stabilityVSAvoidsurface accuracy

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The method determines the blocking-induced deformation before machining and pre-compensates it by modifying the target surface data. This preliminary compensation action allows the deformation to occur as expected while the final surface matches the desired optical specifications.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system applies a counteracting deformation to the target surface data that precisely opposes the blocking-induced deformation. This preliminary anti-action ensures that when blocking occurs during machining, the net effect produces the desired accurate surface.

Inventive Principle:

Principle #9Preliminary anti-action

2Ease of manufacture

If conventional machining methods are used without compensation, then the manufacturing process is simple, but optical power errors occur due to unaccounted deformation

Engineering Contradiction:

Improveprocess simplicityVSAvoidoptical power accuracy

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The system replaces physical trial-and-error machining with a computational model that predicts blocking deformation. By substituting mechanical experimentation with mathematical modeling, the system achieves high precision while maintaining manufacturing efficiency.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system creates a digital model (copy) of the blocking deformation effect and uses this virtual representation to pre-compensate the target surface. This copying approach allows accurate prediction and compensation without physical experimentation.

Inventive Principle:

Principle #26Copying

3Stability of the object's composition

If blocking forces are increased to improve holding stability, then device stability is enhanced, but deformation defects increase proportionally

Engineering Contradiction:

Improveholding stabilityVSAvoidsurface accuracy

Core Design Contradiction:

Stability of the object's compositionVSManufacturing precision

Solution Approach 1:

The system changes the parameters of the target surface data based on the blocking forces applied. By adjusting the target surface parameters to account for expected deformation, the system maintains accuracy regardless of the magnitude of blocking forces used for stable holding.

Inventive Principle:

Principle #35Parameter changes

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 effectively compensates for deformation phenomena during machining, limiting optical power errors and enhancing the accuracy of ophthalmic devices by accounting for blocking effects and material characteristics.

Implementation Method 1

the reproducible defect is a deformation defect which is due to the blocking the ophthalmic device when a face of which is machined

Methodology Applied

Scientific EffectDeformation: Deformation

Data Source

PatentUS20250224706A1Computer-implemented method and manufacturing system for manufacturing by machining an ophthalmic device

Publication Date: 2025.07.10 ESSILOR INTERNATIONAL(COMPAGNIE GENERALE D OPTIQUE)

AI summary

The disclosure relates to a method for manufacturing by machining an ophthalmic device, comprising providing an optical function of the ophthalmic device to be obtained, selecting (100) an initial ophthalmic surface of the ophthalmic device intended to be manufactured, selecting (110) a manufacturing method intended to be implemented for machining the ophthalmic device and which introduces a reproducible defect, providing (120) a defect value which is function of the initial ophthalmic surface and reproducible defect and which would be introduced if the initial ophthalmic surface were produced by said manufacturing method, transforming (130) said initial ophthalmic surface into a transformed ophthalmic surface by compensating said defect, machining (150) by said manufacturing method the transformed ophthalmic surface in order to obtain an ophthalmic surface of the ophthalmic device having the optical function, wherein said manufacturing method comprises blocking (140) the ophthalmic device to be machined and the reproducible defect is a deformation defect which is due to the blocking the ophthalmic device when a face of which is machined for obtaining the ophthalmic surface of the ophthalmic device having the optical function.