Polishing head of chemical mechanical polishing apparatus
AssigneeSamsung Electronics Co., Ltd.
InventorSung-Choul Lee
Life of this patent
Estimating the term…
Abstract
A polishing head of a wafer polishing apparatus includes a body, a center supporter installed in a center of the body, a perforated plate including an upper plate and a lower plate that is disposed below the center supporter and has a plurality of thru-holes, a membrane covering the perforated plate, and a moving member for moving the lower plate up and down. By moving the lower plate up and down, the polishing head forcibly recovers an elasticity of the membrane (especially at an edge portion of the membrane).
Claims10
A polishing head of a wafer polishing apparatus, comprising:
- a body;
- a center supporter disposed in a center of the body;
- an upper and a lower plate disposed under the center supporter, the upper plate and the lower plate each having thru-holes;
- a membrane fixed to the upper plate and disposed to enclose a lower surface of the lower plate, the membrane configured to uniformly expand when a gas pressure is applied through the thru-holes, the membrane configured to uniformly contract when a vacuum pressure is applied through the thru-holes;
- and
- a moving member for moving the lower plate up and down.
A polishing head of a wafer polishing apparatus, the polishing head comprising:
- a body;
- a center supporter disposed in a center of the body;
- an upper and a lower plate disposed under the center supporter, the upper plate and the lower plate each having thru-holes;
- a membrane, the membrane configured to uniformly expand when a gas pressure is applied through the thru-holes, the membrane configured to uniformiy contract when a vacuum pressure is applied through the thru-holes;
- and
- a moving member configured to move the lower plate upwards and downwards, the moving member including an elastic member, the elastic member disposed between the upper and lower plates and configured to move the lower plate responsive to an externally provided gaseous pressure.
A wafer polishing apparatus that includes a polishing head, the polishing head comprising:
- a body;
- a supporter disposed within the body;
- a perforated plate affixed to the supporter, the perforated plate having thru-holes that pierce the perforated plate, the perforated plate including an upper plate and a lower plate;
- and
- a membrane affixed to an upper surface of the upper plate, the membrane enclosing a radially outer surface of the upper plate, a radially outer surface of the lower plate, and a lower surface of the lower plate, the membrane configured to uniformly expand when a gas pressure is applied to the membrane via the thru-holes, the membrane configured to uniformly contract when a vacuum pressure is applied to the membrane via the thru-holes.
Dependencies are inferred from the claim text.