Patent ID: 11881794
Assignee: SHINKO ELECTRIC INDUSTRIES CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. An electrostatic adsorption member comprising:
a dielectric member having a first surface and a second surface on an opposite side to the first surface and formed with a through-hole penetrating from the first surface to the second surface; and
a porous body provided in the through-hole and having a third surface flush with the first surface,
wherein the through-hole has:
a first opening apart from the first surface by a first distance in a first direction perpendicular to the first surface, and
a second opening apart from the first surface by a second distance larger than the first distance in the first direction,

wherein in a plan view from the first direction, at least a portion of the first opening is inside the second opening,
wherein in a plan view from the first direction, the porous body has:
a first portion located inside the first opening, and
a second portion connected to the first portion and located outside the first opening, and

wherein an inner wall surface of the through-hole is formed with a spiral groove.