Illumination device including doppler sensor

摘要

An illumination device includes a cover (4); a lamp (2) including a light emitting unit; and a doppler sensor (5) including a receiving unit (51), disposed on the same side as the lamp with respect to a first plane (P1) including a surface of the cover facing the lamp. In a cross section that intersects the receiving unit (51) and is orthogonal to a central axis of the light emitting unit, "¸" between a boundary line of a detectable range of the receiving unit close to the lamp and a normal to the first plane (P1), "d" between the central axis and the first plane, "r" of the light emitting unit; "y" between the first plane and the receiving unit; and "x" between the receiving unit and a second plane that includes the central axis of the light emitting unit and is orthogonal to the first plane satisfy the following equation. x > y + d tan¸ + r cos¸