Patent ID: 7618494
Filing Date: 2009-11-17
Classification: H01L

Abstract:
1. A substrate holding structure comprising: a support column including a main body having an outer diameter, d, a top end portion with a flanged part, and an outer curvilinear transition part from the support column to the flanged part, a substrate holding table joined to the flanged part at an annular joint surface between the table and the flanged part; and a heating mechanism in the substrate holding table; the substrate holding table having a lower surface with an annular U-shaped groove extending along an outer circumferential surface of the flanged part, an inner circumferential surface of the U-shaped groove being connected to the outer circumferential surface of the flanged part to form a continuous smooth outermost surface surrounding the joint surface; and the lower surface of the substrate holding table having a second annular groove opposing the flanged part, whereby the flanged part is joined to the lower surface of the substrate holding table to provide the annular joint surface at only an outermost annular area of an upper surface of the flanged part, the second groove extending radially outwardly from a projection of outer diameter, d, through the flanged part, to the annular joint surface, whereby the second groove forms a space that separates a substantial portion of the upper surface of the flanged part from the substrate holding table.