| 摘要 |
A portable light source comprises a lamp (10) contained in a lamp box (42), which is housed in a case (41) to significantly reduce the influences of ambient temperature. In other words, the deuterium lamp (10), likely to be influenced by temperature, is enclosed in a double shield structure including the case (41) as well as the lamp box (42). It is known that ultraviolet irradiation of the air generates ozone. To prevent ultraviolet rays from penetrating the cooling air, an ultraviolet window (69) of the lamp box (42) is provided on an extension light guide (70). As a result, the generation of ozone is controlled in the areas where ultraviolet rays exist in the case (41), effectively preventing the fluctuation of output light due to the generation of ozone.
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