Razor technology
AssigneeThe Gillette Company
InventorsC. Robert Parent, John Madeira, Steve S. Hahn
Life of this patent
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Abstract
A razor blade includes a substrate with a wedge-shaped edge, a layer of molybdenum on the tip and flanks of the wedge-shaped edge, the thickness of the molybdenum layer preferably being in the range of about 50-500 angstroms, and a layer of diamond or diamond-like material on the molybdenum layer that preferably has a thickness of about 200-2,000 angstroms and that defines a tip radius of less than about 500 angstroms, an aspect ratio in the range of 1:13-3:1, a hardness of at least thirteen gigapascals and an L5 wet wool felt cutter force of less than 0.8 kilogram.
Claims12
A process for forming a razor blade comprising the steps of
- providing a substrate,
- forming a wedge-shaped sharpened edge on said substrate that has an included angle of less than thirty degrees and a tip radius of less than twelve hundred angstroms;
- disposing said substrate and a solid target member in a chamber;
- and
- sputtering said solid target member to generate carbon atoms for forming a layer of diamond or diamond-like carbon material on said sharpened edge of said substrate from said carbon atoms from said solid target member while an RF bias is applied to said substrate;
- said layer of diamond or diamond-like carbon material having a radius at the ultimate tip of said diamond or diamond-like carbon material of less than 500 angstroms and an aspect ratio in the range of 1:1-3:1.
A process for forming a razor blade comprising the steps of providing a substrate, forming on said substrate a wedge-shaped edge that has an included angle of less than 30.degree. and a tip radius less than 1,000 angstroms;
- disposing said substrate and a solid target member in a chamber;
- and sputtering said solid target member to generate carbon atoms for forming a layer of diamond or diamond-like carbon material on said wedge-shaped edge while an RF bias is applied to said substrate to provide a radius at the ultimate tip of said diamond or diamond-like carbon material of less than 500 angstroms and an aspect ratio in the range of 1:1-3:1.
Dependencies are inferred from the claim text.