Abstract: To provide a dresser for a polishing cloth in which a stable dressing performance is maintained, a uniformly polished surface is provided on the surface of the polishing cloth, and in particular, a scratch on a wafer caused by the dissociation of abrasive grains is prevented, and a method for producing the same A dresser for a polishing cloth includes a base 1 and a dressing part disposed on the surface of the base. The dressing part includes a plurality of abrasive grains 2 and a plate-shaped holding component 3 that holds the abrasive grains 2. The holding component 3 is composed of cemented carbide, cermet, or ceramic. Alternatively, the holding component 3 may be composed of a material containing silicon to which silicon dioxide is added.

Abstract: An abrasive cloth dresser is provided which is capable of adjusting the state of its dressing face so as to give an abrasive cloth a uniform polishing surface, and capable of giving the surfaces of an abrasive cloth a suitable polishing capability according to polishing objects, even if the dressing face state exhibits individual differences in, for example, the end shapes of abrasive grains. The abrasive cloth dresser 1 includes a base metal 2 having a ring-shaped dressing face 4 in the outer region of the base metal 2. First abrasive grain units 5 and second abrasive grain units 6 formed of abrasive grains with different grain sizes from each other are alternately arranged on the dressing face 4. The base metal 2 includes adjusters 7 for arbitrarily adjusting the height difference &dgr; between reference planes S1 and S2 of the respective abrasive grain units 5 and 6. The reference planes S1 and S2 each include the ends of the abrasive grains with the largest grain size.

Abstract: A powder of diamond or high-pressure phase boron nitride core particles charged into a coating space as it is dispersed, and a precursor of a coat forming substance allowed to contact and/or impinge against the particles in the powder of core particles so that their surfaces are covered with the coat forming substance, thereby preparing coated diamond or high-pressure phase boron nitride particles which are subsequently sintered. The thusly produced diamond of high-pressure phase boron nitride sinter is composed of coated core particles of high performance that are superhard, uniform, dense and sintered firmly, and which have a controlled microstructure.