Mandrel for use in the machining of ophthalmic lenses
AssigneeCooperVision International Limited
InventorsDavid RICKETTS, Edward James Harley EVANS
Life of this patent
Estimating the term…
Abstract
A mandrel 1 for holding an ophthalmic lens member blank 52 during machining is disclosed. The mandrel 1 comprises a front surface 6 for receiving an ophthalmic lens member blank 52 to be machined; a rear surface 8 opposite the front surface 6; and one or more through-holes 10 extending between the front and rear surfaces 6,8. In use, wax applied to the rear surface 8 contacts an ophthalmic lens member blank 52 received on the front surface 6 via said one or more through-holes 10. Methods of producing an ophthalmic lens using such a mandrel and lenses produced using such a mandrel are also disclosed.
Claims21
1-21. (canceled)
A mandrel for holding an ophthalmic lens member blank during machining, the mandrel comprising:
- a front surface for receiving an ophthalmic lens member blank to be machined;
- a rear surface opposite the front surface;
- and
- one or more through-holes extending between the front and rear surfaces;
- such that, in use, wax applied to the rear surface contacts an ophthalmic lens member blank received on the front surface via said one or more through-holes;
- wherein the mandrel comprises a stem for mounting the mandrel on a machine tool and a flange extending radially from the stem, the flange comprising the front surface, the rear surface and the one or more through-holes.
A method of mounting an ophthalmic lens member blank on a mandrel, the mandrel comprising a front surface, a rear surface and one or more through-holes extending between the front and rear surfaces, wherein the mandrel comprises a stem for mounting the mandrel on a machine tool and a flange extending radially from the stem, the flange comprising the front surface, the rear surface and the one or more through-holes, the method comprising:
- the ophthalmic lens member blank being held against the front surface of the mandrel, and while the ophthalmic lens member blank is held against the front surface of the mandrel, applying wax to the rear surface of the mandrel and the wax flowing through said one or more through-holes to contact the rear surface of the ophthalmic lens member blank at the through-holes.
Dependencies are inferred from the claim text.