Method for automatically centring an ophthalmic lens

By using image processing technology to determine the optical center of the lens, the problem of centering difficulties under complex centering marks is solved, achieving precise centering and obstruction of the lens, and ensuring the correct installation of the lens in the eyeglass frame.

CN116963869BActive Publication Date: 2026-06-05ESSILOR INTERNATIONAL(COMPAGNIE GENERALE D OPTIQUE)
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Patent Information

Application Number
CN202280020045.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2021-03-09
Filing Date
2022-03-07
Publication Date
2026-06-05
Estimated Expiration
2042-03-07

AI Technical Summary

Technical Problem

Existing technologies make it difficult to accurately center lenses, especially when the centering marks on the lens have complex and varied shapes, which makes centering operations difficult and makes it impossible to effectively place obstructing accessories.

Method used

By acquiring an image of the lens, the processing unit determines the positions of at least three centering markers, infers the optical center of the lens, and uses the least squares fitting method to locate and scale the regular geometry. Combined with the optical axis orientation of the lens, precise centering of the lens is achieved.

Benefits of technology

It achieves accurate lens centering, avoids manual operation and human error, ensures the correct placement of blocking accessories, and supports subsequent edging and installation processes.

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Abstract

The invention relates to a method for automatically centering an ophthalmic lens (10), comprising the steps of: - positioning the ophthalmic lens on a holder, - acquiring at least one image of the ophthalmic lens received on the holder by means of a camera, and - processing said image by means of a processing unit to find the position of the optical center (P1) of said ophthalmic lens. According to the invention, said ophthalmic lens comprises several distinct centering marks (12) distributed along a geometric figure, said processing step comprising: - for at least three of said centering marks, determining the position of at least one characterization point (P12) of each centering mark, and - deducing therefrom the position of the optical center of said ophthalmic lens.
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