Lens grinding method and apparatus

Details Lens grinding method and apparatus Lens grinding method and apparatus

B - Operations, Transporting

24

B

51/18, 341/65

B24B 49/00 (2006.01) B24B 13/00 (2006.01) B24B 13/04 (2006.01) B24B 13/06 (2006.01)

Patent

CA 2039289

ABSTRACT LENS GRINDING METHOD AND APPARATUS The invention provides a method of generating a lens having desired base and cross curvatures by means of a circular cup shpaed diamond tool, which is rotated about an axis and is swept repeatedly over a lens blank to remove material so as to generate the required surface, the tool being positioned so as to produce the desired combination of base and cross curvatures on the blank, the method comprising positioning the diamond tool by means of a cross slide and a base slide, both of which slides are free to move during the generation of the surface; sweeping the rotating tool over the lens blank and adjusting the cross slide and/or the base slide during the sweep thereby to vary the head angle of the tool during the sweep such that at any position in the sweep the instantaneous head angle is at a value whereby the desired cross curvature produced is constant over the sweep. The invention also relates to a lens generating machine.

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