| 摘要 |
An optical device is provided. The optical device including an optical member having a first main surface and a second main surface, which respectively serve as an entrance surface and an exit surface for light from a directional light source, and made of a material having a refractive index greater than 1; and a support member at least including swing means for the optical member, wherein the first and second main surfaces of the optical member swingable by the support member are able to be inclined with respect to an optical path of the light from the directional light source.
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