Patent ID: 7175515

Claim:
A chemical mechanical polishing apparatus, comprising: a polishing pad; a wafer carrier carrying a wafer to be polished; and a pad conditioner including a non-rotating and non-oscillating conditioner head having a surface area configured to contact and condition the pad, the static conditioner head being held at a fixed position, the surface area having a first end proximate to an axis of rotation of the pad and a second end remote from the axis of rotation of the pad, wherein the first end defines a first arc length S 1 =R 1 θ 1 and the second end defines a second arc length S 2 =R 2 θ 2 , where R is a radii from the axis of rotation and θ is an angle subtending an arc section corresponding to the R, the R 1 and the R 2 having different values wherein S 1 is substantially identical to S 2 .