Patent ID: 7963824
Filing Date: 2011-06-21
Classification: B24B

Abstract:
1. A method of grooving or counter-beveling the periphery of an ophthalmic lens in a grinding machine, the machine comprising: a lens support provided with a mechanism configured to drive the lens in rotation about a first axis; a grooving or counter-beveling wheel mounted on a drive shaft and rotatable about a second axis; a mechanism configured to relatively position the grooving or counter-beveling wheel along the first axis; and a mechanism configured to adjust an angle of tilt of the second axis relative to the first axis; the method comprising: determining a profile for a groove or a counter-bevel; calculating a single treatment angle corresponding to said profile; adjusting the angle of tilt of the second axis relative to the first axis to the value of the single treatment angle; and grinding the groove or the counter-bevel in the lens by rotating the lens about the first axis, such that a width of the groove or the counter-bevel is constant, while maintaining said angle of tilt constant and equal to the value of the single treatment angle at all rotational positions of the lens as the lens is rotated about the first axis.