Patent ID: 11951583
Assignee: NGK INSULATORS, LTD.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  H | IPC B  H

Claim 0:
1. An electrostatic chuck comprising:
a ceramic base;
a ceramic dielectric layer positioned on the ceramic base and being thinner than the ceramic base;
an electrostatic electrode embedded between the ceramic dielectric layer and the ceramic base; and
a ceramic insulating layer positioned on the ceramic dielectric layer and being thinner than the ceramic dielectric layer,
wherein the ceramic insulating layer has a higher volume resistivity and withstand voltage than the ceramic dielectric layer and is an aerosol deposition film, and
the ceramic dielectric layer has a higher dielectric constant than the ceramic insulating layer; and
wherein the aerosol deposition film is void of a glass base with low insulation at grain boundaries between raw material grains.