Electrostatic chuck
First Claim
1. An electrostatic chuck for attracting a flat substrate by an electrostatic force, the electrostatic chuck comprising:
- a body including an internal electrode for attracting the flat substrate by the electrostatic force provided therein, the body further including a first surface serving as an electrostatic attraction surface;
a plurality of protrusions formed on the first surface of the body, each protrusion of the plurality of protrusions having a top surface; and
one or more projections positioned on the top surface of each protrusion, and having an outer diameter smaller than the diameter of the protrusion, each of the one or more projections including a mounting surface on which the flat substrate is loaded,wherein a total area of the mounting surfaces of the one or more projections is equal to or larger than 0.01% and equal to or smaller than 2% of the area of the electrostatic attraction surface,a height of each projection of the one or more projections from the top surface of each protrusion is in a range equal to or larger than 3 μ
m and equal to or smaller than 6 μ
m, anda sum of a height of a protrusion of the one or more protrusions from the first surface of the body and the height of a projection of the one or more projections is in a range equal to or larger than 30 μ
m and equal to or smaller than 45 μ
m.
1 Assignment
0 Petitions
Accused Products
Abstract
An electrostatic chuck capable of widening a temperature range and reducing a variation in thermal conductivity between the electrostatic chuck and the flat substrate over time is provided. The chuck includes: a body that has an internal electrode for attracting a flat substrate by an electrostatic force provided therein, a plurality of protrusions formed on one surface of the body serving as an electrostatic attraction surface, and projections provided on the top surfaces of some or all of the plurality of protrusions. In the electrostatic chuck, a region of the top surface of each of the minute projections on which the flat substrate is loaded is referred to as a mounting surface, and the total area of the mounting surfaces of the minute projections is equal to or larger than 0.01% and equal to or smaller than 2% of the area of the electrostatic attraction surface.
-
Citations
11 Claims
-
1. An electrostatic chuck for attracting a flat substrate by an electrostatic force, the electrostatic chuck comprising:
-
a body including an internal electrode for attracting the flat substrate by the electrostatic force provided therein, the body further including a first surface serving as an electrostatic attraction surface; a plurality of protrusions formed on the first surface of the body, each protrusion of the plurality of protrusions having a top surface; and one or more projections positioned on the top surface of each protrusion, and having an outer diameter smaller than the diameter of the protrusion, each of the one or more projections including a mounting surface on which the flat substrate is loaded, wherein a total area of the mounting surfaces of the one or more projections is equal to or larger than 0.01% and equal to or smaller than 2% of the area of the electrostatic attraction surface, a height of each projection of the one or more projections from the top surface of each protrusion is in a range equal to or larger than 3 μ
m and equal to or smaller than 6 μ
m, anda sum of a height of a protrusion of the one or more protrusions from the first surface of the body and the height of a projection of the one or more projections is in a range equal to or larger than 30 μ
m and equal to or smaller than 45 μ
m. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
Specification