Patent ID: 11862437
Assignee: KIOXIA CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An edge ring comprising:
an inner movable ring provided along an outer circumference of a small diameter portion of an upper plate having an upper surface capable of holding a semiconductor substrate thereon, the inner movable ring being movable in a direction perpendicular to the upper surface;
a stationary ring between the outer circumference of the small diameter portion of the upper plate and an inner circumference of the inner movable ring, the stationary ring being beyond the inner circumference of the inner movable ring and in contact with the small diameter portion of the upper plate;
an outer movable ring provided along an outer circumference of the inner movable ring, the outer movable ring being movable in the perpendicular direction; and
a lifter supporting the outer movable ring and moving the outer movable ring in the perpendicular direction, the lifter being capable of moving the inner movable ring in the perpendicular direction by way of the outer movable ring, wherein
the inner movable ring includes a first flange extending from an upper end of the inner movable ring toward the outer movable ring,
the outer movable ring includes a second flange extending from a lower end of the outer movable ring toward the inner movable ring, the second flange being disposed below the first flange,
the outer movable ring is moved by the lifter in the perpendicular direction in a state where the second flange is located below and apart from the first flange, and
the inner movable ring and the outer movable ring are together moved in the perpendicular direction in a state where the second flange is located below and in contact with the first flange.