Method for CNC-controlled shape grinding of spectacle lenses

Details Method for CNC-controlled shape grinding of spectacle lenses Method for CNC-controlled shape grinding of spectacle lenses

1997-10-31

1999-06-01

Eley, Timothy V.

Abrading

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

Computer controlled

451 11, 451 43, B24B 914

Patent

active

059083484

ABSTRACT:
A method for machining a spectacle lens includes the step of inputting shape data of a spectacle frame opening or shape data of a shaped disk into a computing unit of a CNC-controlled spectacle lens grinding machine. Personal optometric data of a patient are input in the computing unit. A first radius of a front face of the lens blank and a second radius of a rear face of the lens blank as well as the thickness of the lens blank are input the Alternatively, the first and second radii and the thickness of the lens blank are calculated from the optometric data. The front edge curve and rear edge curve of the spectacle lens are either calculated from the shape data of the spectacle frame opening and the optometric data or based on the shape data of a shaped disk, the first and second radii and the thickness of the lens blank. The spacial curve of a suitable V-shaped bevel on the peripheral lens edge between the front edge curve and the rear edge curve is calculated. Grinding of the optical surfaces, of the peripheral lens edges, and of the V-shaped bevel by the spectacle lens grinding machine is controlled based on the shape data and the calculated spacial curve, respectively.

REFERENCES:
patent: 4737918 (1988-04-01), Langlois et al.
patent: 5053971 (1991-10-01), Wood et al.
patent: 5512004 (1996-04-01), Strope
patent: 5538459 (1996-07-01), Gottschald et al.
patent: 5588899 (1996-12-01), Gottschald et al.

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