| 摘要 |
There is provided a light emitting device that is capable of changing the illumination angle in the transverse and vertical directions. An emission unit includes at least an arc tube being elongated in a longitudinal direction thereof, and a reflection umbrella. A light-permeable optical unit is arranged in front of the emission unit at a side thereof closer to a subject in such a manner that a relative distance between the optical unit and the emission unit is variable. The optical unit includes a plurality of light refracting sections provided at a central portion thereof and arranged in the longitudinal direction of the arc tube, and reflection surfaces provided at the opposite sides of the light refracting sections in the longitudinal direction thereof for reflecting luminous fluxes emitted from the emission unit toward a subject. The light distribution characteristics in transverse and vertical directions can be varied by changing the interval between the emission unit and the optical unit.
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