Patent ID: 11869797
Assignee: SHINKO ELECTRIC INDUSTRIES CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC H  B | IPC B  H

Claim 2:
3. An electrostatic chuck comprising:
a base plate that is made of a metal;
a ceramic plate that is fixed to the base plate and configured to adsorb an object by electrostatic force; and
a bonding layer that is provided between the base plate and the ceramic plate to bond the base plate and the ceramic plate to each other, wherein the bonding layer is formed of a composite material including the metal forming the base plate and a ceramic forming the ceramic plate,
wherein the bonding layer comprises:
a first bonding layer that is formed of a first composite material including the metal and the ceramic and provided on the base plate; and
a second bonding layer that is formed of a second composite material including the metal and the ceramic and provided between the first bonding layer and the ceramic plate, and
wherein a composite ratio of the ceramic to the metal in the second composite material is larger than a composite ratio of the ceramic to the metal in the first composite material.