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OwnerThomas G. Decker, Gregory P. Lundie +3inventors
InventorsThomas G. Decker, Gregory P. Lundie, David L. Pappas, Richard P. Welty, C. Robert Parent
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Improved razors and razor blades and processes for producing razor blades or similar cutting tools with sharp and durable cutting edges, by hard-carbon coating of blades with amorphous diamond, preferably using a filtered cathodic arc plasma source. A coating of amorphous diamond having at least 40 percent sp3 carbon bonding, a hardness of at least 45 gigapascals and a modulus of at least 400 gigapascals is applied to the sharpened edge of a substrate. The substrate may be mechanically honed, and there is no interlayer between the substrate and the amorphous diamond coating. The coating imparts stiffness and rigidity to a thin blade while maintaining a high aspect ratio.
A process for forming a razor blade comprising the steps of:
A process for forming a razor blade comprising the steps of
A razor blade comprising a substrate with a wedge-shaped edge defined by facets that have a width of at least about 0.1 millimeter and an included angle of less than 30 degrees and a layer of amorphous diamond on said wedge-shaped edge, said layer of amorphous diamond having been deposited by a high energy source.
A razor blade comprising a substrate with a wedge-shaped edge and a layer of amorphous diamond material on one of the tip and flanks of said wedge-shaped edge and a polymer coating deposited on said wedge-shaped edge, said layer of amorphous diamond material having a thickness of at least about 400 angstroms from the sharpened tip of said substrate to a distance of forty micrometers from the sharpened tip and defining a tip radius of less than about 1000 angstroms, said layer of amorphous diamond having been deposited by a high energy source.
A shaving unit comprising a support structure having spaced apart skin-engaging surfaces, and a razor blade structure secured to said support structure, said razor blade structure including a substrate with a wedge-shaped edge and a layer of amorphous diamond on one of said wedge-shaped edge and a polymer coating deposited on said wedge-shaped edge, said amorphous diamond coated wedge-shaped edge being disposed between said skin-engaging surfaces, said layer of amorphous diamond having been deposited by a high energy source.
A razor blade comprising a substrate with a wedge-shaped edge and a layer of amorphous diamond material on the tip and flanks of said wedge-shaped edge, said layer of amorphous diamond material having a thickness of at least about 250 angstroms from the sharpened tip of said substrate to a distance of forty micrometers from the sharpened tip and defining a tip radius of less than about 1000 angstroms, said layer of amorphous diamond having been deposited by a high energy source, said high energy source being one which deposits carbon particles having an energy of at least 10 volts.
A razor blade comprising a substrate with a wedge-shaped edge and a layer of amorphous diamond material on the tip and flanks of said wedge-shaped edge, said layer of amorphous diamond material having a thickness of at least about 250 angstroms from the sharpened tip of said substrate to a distance of forty micrometers from the sharpened tip and defining a tip radius of less than about 1000 angstroms, the amorphous diamond material having at least 40 percent sp3 carbon bonding.
A blade having a cutting edge bounded by a first inclined surface and a second inclined surface, said cutting edge having a tip at the juncture of said first and second inclined surfaces, and enclosing an angle defined by the tip and the first and second inclined surfaces,
Dependencies are inferred from the claim text.