Process for grinding an ophthalmic lens, including a...

Details Process for grinding an ophthalmic lens, including a... Process for grinding an ophthalmic lens, including a...

2005-05-24

2005-05-24

Nguyen, Dung Van (Department: 3723)

Abrading

Precision device or process - or with condition responsive...

With indicating

C451S043000, C451S005000

Reexamination Certificate

active

06896587

ABSTRACT:
Process for grinding the rim of an ophthalmic lens that has two opposite faces, following a predetermined contour corresponding to that of a ring of a spectacle frame in which the lens is intended to be mounted, the contour being delimited on each of the faces by an edge, and the process includes a plotting stage in which the three-dimensional shape of at least one of the edges is plotted. In the plotting stage, the edge is scanned on the illuminated face of lens using a light beam forming a light spot on the face, the successive positions of an image of the light spot are plotted simultaneously on optical reception elements pointing towards the light spot, and the three-dimensional shape of the edge is deduced from the plots made, machining of the lens being carried out according to the plot or plots.

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patent: 20030220054 (2003-11-01), Guillermin et al.
patent: 20040039546 (2004-02-01), Guillermin et al.

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