| 摘要 |
A ring-shaped light emitting unit including a ring-shaped light guiding member having a light emitting surface which is continuous along an extending direction thereof, and n light guiding paths for guiding light of a light source into the ring-shaped light guiding member, the n light guiding paths being continuously connected to portions of an outer periphery of the ring-shaped light guiding member at positions rotationally symmetrical about a center of the ring-shaped light guiding member as a reference, wherein an inner periphery of the ring-shaped light guiding member is a substantially perfectly round circle in a plan view, and the outer periphery of the ring-shaped light guiding member has a shape in which circular arcs of a plurality of substantially perfectly round circles are continuously connected in a plan view, excluding light entering portions.
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