| 摘要 |
<p>PURPOSE:To differentiate a natural light from an artificial light out of lights projected from two directions to detect the illuminance of the lights by a single illuminance sensor. CONSTITUTION:A cover 3 covers a single illuminance sensor 1. The cover 3 is provided with a first opening part 3a transmitting a light 4 projected from a first direction, and a second opening part 3b transmitting a light 5 projected from a second direction, respectively facing a light receiving face 1a of the illuminance sensor 1. A first filter 6 has a spectral sensivity characteristic transmitting only a light of low wavelength component, and covers the first opening part 3a. A second filter 7 has a spectral sensitivity characteristic for transmitting only a light of high wavelength component, and covers the second opening part 3b.</p> |
