Patent ID: 8515274

Claim:
An illumination device comprising: a light guide unit in which an optical path through which light propagates is formed in an annular shape such that the light propagating through the optical path is emitted from a front surface side of the light guide unit; a local reflection unit provided on at least a rear surface side of the light guide unit such that light is emitted from only a portion of the front surface side of the light guide unit; and a light source which moves between the light guide unit and the local reflection unit, wherein when the light source is positioned on the light guide unit side, the light output from the light source propagates in the optical path of the light guide unit and is annularly emitted from the front surface side; and when the light source is positioned on the local reflection unit side, the light output from the light source is reflected by the local reflection unit and emitted in a concentrated manner from only the portion on the front surface side of the light guide unit.