Patent ID: 7484958
Filing Date: 2009-02-03
Classification: H01L

Abstract:
1. A vertical boat for heat treatment comprising: a top plate; a bottom plate; and three or more column members fixed between the top plate and the bottom plate, a plurality of grooves being formed in each column member so as to create a supporting part for horizontally supporting a wafer-like body to be treated between the grooves, wherein each column member of the three or more column members has a circular arc-shaped cross section and is cylindrically disposed, wherein each column member of the three or more column members has a plurality of individual supporting parts in the vertical direction, wherein the supporting parts of the three or more columns are arranged to form sets of supporting parts having a common vertical height, the supporting parts of the sets not being connected to each other but forming a common horizontal plane, wherein the supporting parts all have the shape of circular arc having a center angle of 20° to 100° , wherein the supporting parts and the column member are a monolithic piece of a same material, and wherein the wafer-like body to be treated is inserted from the grooves of the column members and supported along a circumferential part of a lower surface thereof by the three or more respective circular arc-shaped supporting parts in the common horizontal plane.