| 摘要 |
A light source device comprises a pair of aperture blades, which opens and closes an optical path through which illumination light radiated from a light source passes so that the amount of the illumination light entering a light guide fiber bundle of the endoscope is adjusted. A guide slot is formed in each of the aperture blades, and an engaging pin is engaged with each of the guide slots. A tension coil spring connects the aperture blades to urge the aperture blades always in a direction in which the aperture blades opens or closes, so that the engaging pin is always engaged with an edge of the guide slot.
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