| 摘要 |
PROBLEM TO BE SOLVED: To provide a light source that can extend lifetime of a discharge tube. SOLUTION: In this light source, a heat radiator is made to contact with a side-on type discharge tube 10 with a projection 1pr. Light from the discharge tube 10 exits through a light exit window 1ww located atop the projection 1pr. The radiator is kept in contact with a sidewall 1w at a peripheral region 1ws, located on the foot of the projection 1pr. The radiator consists of a spring member 101sp, in direct contact with the peripheral region 1ws and a radiator block 101bl that connects the spring member 101sp to a radiator box 101bx. Because the substances produced by sputter or the like of electrodes in the discharge tube 10 deposit mainly on the peripheral region 1ws, quantity of materials deposited on the light exit window 1ww can be lowered to make lifetime of the discharge tube longer.
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