Patent ID: 9480136
Filing Date: 2016-10-25
CPC Classification: H01S,H05G

Claim Text:
1. An extreme ultraviolet light source device comprising: a disc-like rotating element; a rotation unit configured to cause the rotating element to rotate about a rotation center shaft, which is perpendicular to a flat surface of the rotating element; a cover-like structure configured to surround the rotating element with a gap; a first reserving vessel disposed in the cover-like structure and configured to reserve a liquid high temperature plasma raw material, with part of the rotating element being immersed in the high temperature plasma raw material reserved in the first reserving vessel; a raw material supplying mechanism configured to apply the liquid high temperature plasma raw material onto at least part of the flat surface of the rotating element upon a rotating movement of the rotating element; an energy beam providing device configured to irradiate the high temperature plasma raw material with an energy beam; and a film thickness controlling mechanism provided in the cover-like structure, the film thickness controlling mechanism including a U-shaped structure having a channel-like recess, the U-shaped structure being biased by an elastic body in a direction against the flat surface of the rotating element such that two opposite sides of the U-shaped structure contact the flat surface of the rotating element, a clearance between the rotating element and a bottom of the recess of the structure, which faces the rotating element, being set such that the liquid high temperature plasma raw material applied on the rotating element has a predetermined film thickness, the cover-like structure of the raw material supplying mechanism having an opening in a certain part of the cover-like structure such that the energy beam is directed to the flat surface of the rotating element, on which the high temperature plasma raw material is applied, through the opening of the cover-like structure, and extreme ultraviolet light generated upon irradiation of the energy beam is released from the opening of the cover-like structure, the cover-like structure having a scattering preventing member disposed to oppose a direction of a centrifugal force acting on the rotating element, which is caused to rotate by the rotation unit, and cover the rotating element, wherein the energy beam is directed to one of two flat surfaces of the disc-like rotating element, which are perpendicular to the rotation center shaft, and an optical axis of the extreme ultraviolet light is decided based on a position where the high temperature plasma, which emits the extreme ultraviolet light, is generated and a position where an extreme ultraviolet light condensing mirror is mounted, or based on the position where the high temperature plasma is generated and an optical system used to test a mask, and the optical axis of the extreme ultraviolet light is set such that the energy beam directed to the rotating element do not coincide with a direction of the energy beam reflected by the rotating element.