Patent ID: 9321144
Filing Date: 2016-04-26
CPC Classification: B24B

Claim Text:
1. A polishing head of a chemical mechanical polishing apparatus, comprising: a housing configured to move up and down; a base assembly connected to a bottom of the housing, the base assembly being configured to support the housing; a membrane on a bottom of the base assembly; and a retainer ring surrounding the membrane and connected to the bottom of the base assembly, the membrane including: a pressing portion configured to adsorb and press a substrate, a first partition on the pressing portion, the first partition extending from an edge of the pressing portion along a height direction, a first horizontal extending portion extending from an upper end portion of the first partition toward a center of the membrane, and a second horizontal extending portion extending from the upper end portion of the first partition toward the center of the membrane, the second horizontal extending portion being above the first horizontal extending portion and including a pressure-expandable curved portion, the curved portion including at least two folds covering each other above the first horizontal extending portion and being surrounded by an empty space on topmost and lateral sides thereof.