Patent ID: 9660557
Date: 2017-05-23
CPC Classifications: H02N,Y10T

Claim:
1. An electrostatic chuck comprising: a pedestal part formed of metal and electrically connected to a high frequency power source, the pedestal part including a gas passage; an insulation substrate mounted on the pedestal part and including a first surface facing the pedestal part and a second surface on an opposite side of the first surface, the first surface including a first hole part communicating with the gas passage, the second surface including a second hole part having a bore diameter less than that of the first hole part and communicating with the first hole part; and an insulation flow part formed of an insulating material and including a first end provided in the first hole part of the insulation substrate and a second end provided in the gas passage of the pedestal part electrically connected to the high frequency power source; wherein the insulation flow part is configured to allow a gas supplied from the gas passage to flow into the second hole part, wherein the insulation flow part is configured to insulate the gas passage of the pedestal part from a high frequency electric power that is applied from the high frequency power source to the pedestal part, wherein the insulation flow part is configured to insulate a pathway extending to the second surface of the insulation substrate from the high frequency electric power of the pedestal part that is applied from the high frequency power source to the pedestal part, the pathway including the gas passage, the first hole part, and the second hole part, and wherein a boundary between the first hole part and the second hole part has a step formed by a difference in the bore diameter, and the step faces, across an empty gap, a furthest end of the insulation flow part, the furthest end projecting further toward the second surface of the insulation substrate than any other part of the insulation flow part, an outer diameter of the furthest end of the insulation flow part being equal to a diameter of the empty gap across which the step faces the furthest end.