Patent ID: 6287112
Filing Date: 2001-09-11
Classification: C30B,H01L

Abstract:
A wafer boat, comprising:a first end member at a first extremity of the wafer boat;a second end member at a second extremity of the wafer boat;at least three axial rods connected between the first end member and the second end member to define a housing for receiving a number of axially spaced wafers;shield rings configured to be fitted within the housing, wherein each shield ring defines a shield plane that extends substantially parallel to an accommodation plane for a wafer and has an inner circumference and an outer circumference, wherein the shield plane extends inside and outside said housing, and wherein a radial distance between the inner circumference and the outer circumference is smaller at ring section adjacent to the axial rod than at ring sections between the axial rods; andsupports connected to the shield rings, wherein at least three supports are configured to accommodate a wafer and to define the accommodation plane for a wafer.