Patent ID: 8530946

Claim:
A spectrum sensor comprising: a photodetector device; an angle restriction filter that transmits light incident thereon in an incident angle range toward the photodetector device; and a wavelength restriction filter that restricts wavelengths of light that passes through the angle restriction filter, wherein the photodetector device includes: a first semiconductor region of a first conductivity type electrically connected to a first connection section; a second semiconductor region of a second conductivity type formed on the first semiconductor region; a third semiconductor region of the first conductivity type formed on the second semiconductor region; and a plurality of fourth semiconductor regions of the second conductivity type formed on the second semiconductor region, each of the plurality of fourth semiconductor regions being surrounded by the third semiconductor region, each of the plurality of fourth semiconductor regions including a second conductivity type impurity having a concentration higher than a concentration of the second semiconductor region, and electrically connected to a second connection section.