US 8,300,983 B2Granted

Method of determining the position of a drill hole to be drilled on an ophthalmic lens

AssigneeEssilor International (Compagnie Generale d'Optique)

InventorPhilippe Pinault

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Abstract

Method of determining the position of a target drill hole to be drilled in a target corrective lens having an expected target outline after shaping, the position being determined from a reference lens having a reference outline and at least one reference drill hole, the method includes: acquiring an image and at least one characteristic of the curvature of the reference lens; determining, in the acquisition plane, the reference distance in projection between the projection of a reference anchor point of the associated reference lens and the reference lens and the projection of a reference drilling point of the reference drill hole calculating the three-dimensional reference distance between the reference anchor point and the reference drilling point as a function of the characteristic of the curvature of the reference lens (100) and of the determined reference distance; and determining the position of the target drilling point for the target drill hole of the target corrective lens as a function of the calculated three-dimensional reference distance (R2; R5).

Claims20

Dependent claims

A method of determining the position of a target drill hole (210;

250) to be drilled in a target corrective lens (200) having an expected target outline (220) after shaping, the position being determined from a reference lens (100) that presents a reference outline (120) and at least one reference drill hole (110;
150), the method comprising the following steps:
acquiring an image of the reference lens (100) in an acquisition plane (P1;
P2), in particular including an image of its reference outline (120) and an image of its reference drill hole (110;
150);
deducing therefrom the position relative to the target outline (220) of the target drilling point (C10;
C15) for a target drill hole (210;
250) of the target corrective lens (200);
the method being characterized in that it further comprises the following steps:
acquiring at least one characteristic (ALPHA100;
ALPHA150) of the curvature of the reference lens (100);
determining, in the acquisition plane (P1;
P2), the reference distance in projection (R1;
R4) between the projection (MO1;
MC1) of a reference anchor point (O1;
C1) of the reference lens (100), this reference anchor point being associated with the reference outline (120), and the projection (MC1;
MC5) of a reference drilling point (C1;
C5) of the reference drill hole (110;
150);
calculating the three-dimensional reference distance (R2;
R5) between the reference anchor point (O1;
C1) of the reference lens (100) and the reference drilling point (C1;
C5) of the reference drill hole (110;
150) as a function of said characteristic (ALPHA100;
ALPHA150) of the curvature of the reference lens (100) and of the determined reference distance (R1;
R4) in projection;
and
determining the position of the target drilling point (C10;
C15) for the target drill hole (210;
250) of the target corrective lens (200) as a function of the calculated three-dimensional reference distance (R2;
R5).

28 more elements

Dependencies are inferred from the claim text.