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OwnerThomas G. Decker, Gregory P. Lundy +3inventors
InventorsThomas G. Decker, Gregory P. Lundy, 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 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 20 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, said high energy source being one which deposits carbon particles having an energy in the range of 10-200 electron 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 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, said high energy source being one which deposits carbon particles having an energy in the range of 10-200 electron volts.
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 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, said high energy source being one which deposits carbon particles having an energy in the range of 10-200 electron volts.
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,
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 in the range of 10-200 electron volts.
Dependencies are inferred from the claim text.