Patent ID: 7101271

Claim:
A polishing head of a chemical mechanical polishing apparatus, comprising: a membrane supporter, said membrane supporter having a guide groove; a membrane having a fixing portion fixed to said membrane supporter, a pressure portion including a plurality of regions, and a partition portion extending from said pressure portion at a border between said plurality of regions; a slider to which said partition portion of the membrane is fixed, said slider being received in said guide groove in the membrane supporter and being slidable relative to said membrane supporter within said guide groove between a first position at which said membrane is expanded, and a second position at which said membrane is contracted; and, a first air chamber open to one of said plurality of regions of the pressure portion of said membrane at an outer peripheral portion of the membrane located to one side of said partition portion and a second air chamber open to another one of said plurality of regions of the pressure portion of said membrane located to the other side of said partition member, whereby different amounts of air pressure can be exerted on said plurality of regions of the pressure portion of said membrane via said first and second air chambers, respectively.