Patent ID: 8172423

Claim:
An illumination apparatus comprising: a light source unit including one or more solid light-emitting elements; a sensor unit including a wave transmission portion for transmitting energy waves of specified frequency and a wave reception portion for receiving the energy waves reflected from an object, the sensor unit being configured to output a detection signal by detecting the presence or absence of the object within a detection range based on the difference in frequency between the transmitted and received energy waves; a control unit configured to turn on the light source unit in response to the detection signal outputted from the sensor unit; a power source unit for supplying electric power to the light source unit, the power source unit being arranged outside the detection range of the sensor unit; and an open-bottom housing that accommodates therein the light source unit, sensor unit, control unit, and the power source unit, wherein the sensor unit is provided on the opposite side to the direction of light irradiated from the light source unit, and wherein the sensor unit is invisible from the outside of the housing body.