Patent ID: 9599812
Date: 2017-03-21
CPC Classifications: G02B,G03F,H05G,H05H

Claim:
1. A rotational type foil trap arranged adjacent to a plasma that emits light, for allowing the light to transmit but trapping a debris from the plasma, comprising: a rotation axis; a rotary mechanism configured to rotate the rotation axis; a plurality of foils radially extending from a main shaft, the plurality of foils being supported by a center support arranged on the main shaft and configured to be capable of being rotated by the rotary mechanism coupled to the center support with the center support being the rotation axis; and a plurality of grooves on a side face of the center support, each of the grooves being filled with a brazing material, one end of each of the foils being inserted into each of the grooves to be joined to the each of the grooves of the center support, the center support and each of the foils being fixed by brazing, and the brazing material having a brazing temperature less than recrystallization temperature of a material of the center support and the foils.