| 摘要 |
PROBLEM TO BE SOLVED: To provide a lens holder capable of efficiently cooling as far as the centers of a plurality of lenses by allowing a cooling gas to circulate through a space between the lenses without stagnation.SOLUTION: A lens holder holding a plurality of lenses 3a, 3b includes at least one first gas passage 10b for a cooling gas PA to flow. Each of the gas passages 10b is formed on a surface vertical to a central axis of the plurality of lenses 3a, 3b while inclining at a predetermined angle to a central direction of the plurality of lenses 3a, 3b. |
