| 摘要 |
<p>A sharpened wedge-shaped edge (52) has an acute angle less than 17 degrees up to the distance 40 micrometers from the cutting edge (520) of the sharpened edge (52) and the cutting edge radius thereof is less than 500 Angstrom units, whereby a layer (60) of diamond or diamond-like material has an apex edge (70) being defined by facets (62, 64) having length within the range of 0.1 micrometer to 0.25 micrometer and defining an angle of at least 60 degrees, The diamond or diamond-like carbonaceous material apex edge (70) radius is less than 40 Angstrom units and the ratio of the layer (60) of diamond or diamond-like material thickness (a) above the cutting edge (520) of the sharpened wedge-shaped edge (52) to the thickness (b) of the diamond or diamond-like material layer (60) on the sharpened wedge-shaped edge (52) is within the range of 1 : 1 to 3 : 1. The diamond or diamond-like material layer (60) is made so that a substrate (50) and a graphite target (98) are placed opposite to each other in a chamber (74) from which air has been evacuated, a radio frequency overvoltage is applied to said substrate (50) and the graphite target (98) is the sprayed by bombarding thereof with ions, to thereby generating carbon atoms, that are deposited in the form of the diamond or diamond-like material layer (60) onto the sharpened wedge-shaped edge (52) of the substrate (50).</p> |
