Ophthalmic machine and method for machining and/or polishing a lens

摘要

The invention relates to an ophthalmic machining machine comprising machining means and means for supporting a blank. The invention is characterized in that the machine is capable of transferring marks to said blank that can be identified by monitoring means for repositioning the blank on said supporting means after machining the opposite surface. The invention also relates to a workholding tool. The invention is characterized in that said supporting means are mounted on a bearing surface, which is oblique in relation to a surface of a carriage, by depression of an opening surrounded by an O-ring seal and a fixed bearing. The invention also relates to a machining method according to which the markings are transferred to a blank, the position of said markings is assessed by monitoring means which position machining means for the machining process, and each surface of the resulting lens is polished with polishing means.

主权项

1. An ophthalmic machine for at least one of machining or polishing a lens or plastic blank, comprising:
a tool selected from the group of a machining tool and a polishing tool; machining means for machining along a first axis and constructed for driving said tool; workpiece supporting means having holding means disposed thereon for holding the blank in place, the blank has a first face and a second face opposite thereto; means for inverting the blank for allowing machining on each of the faces; said machining means being constructed for transferring markings onto the blank that can be recognized or identified by monitoring means for repositioning the blank on said holding means after an opposite face has been machined; a main platform carrying secondary platforms, said secondary platforms carrying carriages oriented in a direct orthogonal Cartesian reference system along an X-axis, a Y-axis, and a Z-axis, the Z-axis being parallel or coincident with said first axis, said X-axis and said Z-axis defining a horizontal plane, said X-axis and said Y-axis defining a first vertical plane and said Z-axis and said Y-axis defining a second vertical plane; said workpiece supporting means including at least one workpiece holder having an oblique support surface inclined at an angle α to said Y-axis in said second plane and at an angle β to said x-axis in said horizontal plane, said support surface carrying said holding means, said angle α and said angle β each being between 20° and 45°; the machine being constructed for carrying out a machining operation along said first axis with a steadily increasing Z-value or else with a steadily decreasing Z-value over an entire machining sequence of one of the faces of the blank.