Tangent Bar Forms Arcuate Surface Patents (Class 125/11.1)
  • Publication number: 20020173234
    Abstract: The present invention discloses a CMP pad dresser which has a plurality of uniformly spaced abrasive particles protruding therefrom. The abrasive particles are super hard materials, and are typically diamond, polycrystalline diamond (PCD), cubic boron nitride (cBN), or polycrystalline cubic boron nitride(PcBN). The abrasive particles are brazed to a substrate which may be then coated with an additional anti-corrosive layer. The anti-corrosive layer is usually a diamond or diamond-like carbon which is coated over the surface of the disk to prevent erosion of the brazing alloy by the chemical slurry used in conjunction with the CMP pad. This immunity to chemical attack allows the CMP pad dresser to dress the pad while it is polishing a workpiece. In addition to even spacing on the substrate, the abrasive particles extend for a uniform distance away from the substrate, allowing for even grooming or dressing of a CMP pad both in vertical and horizontal directions.
    Type: Application
    Filed: March 27, 2002
    Publication date: November 21, 2002
    Inventors: Chien-Min Sung, Frank Lin