Mold inserts
AssigneeEssilor International
InventorsMarie-Paule Ferrachat, Fabienne Hanriot, Alain Massee, Alain Coulon
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Abstract
The invention relates to a mold insert, the interior surface thereof having an average quadratic roughness of less than 10 nm. Said insert is covered with a protective layer exhibiting a Vickers hardness of more than 1000 HV, a thickness of between 0.2 and 5 μm, and an adhesive strength greater than 15 N. The invention also relates to a method for the production thereof. The invention is used for the production of ophthalmic lenses.
Claims13
A molding insert, the internal surface of which has a mean square roughness Rms of less than 10 nm, which insert is coated with a protective coating having a Vickers hardness of greater than 1000 HV, a thickness of between 0.2 and 5 μm and the critical adhesion force of which is greater than 15 N.
The insert as claimed in one of the preceding claims, in which the insert bears markings.
The insert as claimed in one of the preceding claims, in which the thickness of the protective coating is between 2 and 5 μm.
The insert as claimed in one of the preceding claims, in which the insert coated with the protective coating has an average surface roughness of less than 7 nm.
The insert as claimed in one of the preceding claims, in which the protective coating has a Vickers hardness of greater than 1500 HV.
A device for molding an optical component comprising an insert as claimed in one of the preceding claims.
A process for manufacturing a molding insert, comprising the steps of:
- machining and polishing of an insert until an Rms of less than 10 nm is obtained;
- and
- deposition of a protective coating having a Vickers hardness of greater than 1000 HV, a thickness of between 0.2 and 5 μm and the critical adhesion force of which is greater than 15 N.
Dependencies are inferred from the claim text.