| 摘要 |
A light source apparatus comprises a mercury lamp having an arc tube having a light emitting portion and sealing portions extending from both sides of the light emitting portion, respectively and, a concave reflection mirror which reflects light emitting from the discharge lamp in a predetermined direction, and a front glass made from light transmissive material, which is arranged in an opening side of the concave reflection mirror, wherein a reflective surface of the concave reflection mirror is made of metal, and, wherein a reflective film which reflects infrared light and ultraviolet light, is formed on a surface of the front glass, and the infrared light and ultraviolet light which emitted from the extra-high mercury discharge lamp are reflected on the front glass so as to be returned to part of electrodes of the extra-high pressure mercury lamp or between the electrodes.
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