Lens blank having a temporary grip coating for a method for manufacturing spectacle lenses according to a prescription
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United States of America Patent
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Dec 27, 2016
Grant Date -
Jan 7, 2016
app pub date -
Jun 23, 2015
filing date -
Jul 5, 2014
priority date (Note) -
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Abstract
A lens blank is proposed, having a first face, an opposite, second face, and an edge inbetween, the first face possessing a final curvature and being coated, in this order, with an antireflection coating, a top coating, and a temporary grip coating. The antireflection coating has a stack of alternating antireflection layers with an outermost layer, whereas the top coating is selected from a group including hydrophobic, oleophobic and dirt repelling coatings. The temporary grip coating and the outermost layer of the antireflection coating are made from one and the same coating material. In this way the temporary grip coating effectively serves to provide sufficient adhesion to the blocking material on the block piece in the processing steps, and can easily be removed from the processed lens upon deblocking without degrading the repelling properties of the top coating.
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